minix/kernel/arch/i386/apic.c

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/*
* APIC handling routines. APIC is a requirement for SMP
*/
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#include "kernel/kernel.h"
#include <assert.h>
#include <unistd.h>
#include <minix/portio.h>
#include <minix/syslib.h>
#include <machine/cmos.h>
#include "arch_proto.h"
#include <minix/u64.h>
#include "apic.h"
#include "apic_asm.h"
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#include "kernel/clock.h"
#include "glo.h"
#include "hw_intr.h"
#include "acpi.h"
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#ifdef USE_WATCHDOG
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#include "kernel/watchdog.h"
NMI watchdog is an awesome feature for debugging locked up kernels. There is not that much use for it on a single CPU, however, deadlock between kernel and system task can be delected. Or a runaway loop. If a kernel gets locked up the timer interrupts don't occure (as all interrupts are disabled in kernel mode). The only chance is to interrupt the kernel by a non-maskable interrupt. This patch generates NMIs using performance counters. It uses the most widely available performace counters. As the performance counters are highly model-specific this patch is not guaranteed to work on every machine. Unfortunately this is also true for KVM :-/ On the other hand adding this feature for other models is not extremely difficult and the framework makes it hopefully easy enough. Depending on the frequency of the CPU an NMI is generated at most about every 0.5s If the cpu's speed is less then 2Ghz it is generated at most every 1s. In general an NMI is generated much less often as the performance counter counts down only if the cpu is not idle. Therefore the overhead of this feature is fairly minimal even if the load is high. Uppon detecting that the kernel is locked up the kernel dumps the state of the kernel registers and panics. Local APIC must be enabled for the watchdog to work. The code is _always_ compiled in, however, it is only enabled if watchdog=<non-zero> is set in the boot monitor. One corner case is serial console debugging. As dumping a lot of stuff to the serial link may take a lot of time, the watchdog does not detect lockups during this time!!! as it would result in too many false positives. 10 nmi have to be handled before the lockup is detected. This means something between ~5s to 10s. Another corner case is that the watchdog is enabled only after the paging is enabled as it would be pure madness to try to get it right.
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#endif
#define APIC_ENABLE 0x100
#define APIC_FOCUS_DISABLED (1 << 9)
#define APIC_SIV 0xFF
#define APIC_TDCR_2 0x00
#define APIC_TDCR_4 0x01
#define APIC_TDCR_8 0x02
#define APIC_TDCR_16 0x03
#define APIC_TDCR_32 0x08
#define APIC_TDCR_64 0x09
#define APIC_TDCR_128 0x0a
#define APIC_TDCR_1 0x0b
#define IS_SET(mask) (mask)
#define IS_CLEAR(mask) 0
#define APIC_LVTT_VECTOR_MASK 0x000000FF
#define APIC_LVTT_DS_PENDING (1 << 12)
#define APIC_LVTT_MASK (1 << 16)
#define APIC_LVTT_TM (1 << 17)
#define APIC_LVT_IIPP_MASK 0x00002000
#define APIC_LVT_IIPP_AH 0x00002000
#define APIC_LVT_IIPP_AL 0x00000000
#define APIC_LVT_TM_ONESHOT IS_CLEAR(APIC_LVTT_TM)
#define APIC_LVT_TM_PERIODIC IS_SET(APIC_LVTT_TM)
#define IOAPIC_REGSEL 0x0
#define IOAPIC_RW 0x10
#define APIC_ICR_DM_MASK 0x00000700
#define APIC_ICR_VECTOR APIC_LVTT_VECTOR_MASK
#define APIC_ICR_DM_FIXED (0 << 8)
#define APIC_ICR_DM_LOWEST_PRIORITY (1 << 8)
#define APIC_ICR_DM_SMI (2 << 8)
#define APIC_ICR_DM_RESERVED (3 << 8)
#define APIC_ICR_DM_NMI (4 << 8)
#define APIC_ICR_DM_INIT (5 << 8)
#define APIC_ICR_DM_STARTUP (6 << 8)
#define APIC_ICR_DM_EXTINT (7 << 8)
#define APIC_ICR_DM_PHYSICAL (0 << 11)
#define APIC_ICR_DM_LOGICAL (1 << 11)
#define APIC_ICR_DELIVERY_PENDING (1 << 12)
#define APIC_ICR_INT_POLARITY (1 << 13)
#define APIC_ICR_INTPOL_LOW IS_SET(APIC_ICR_INT_POLARITY)
#define APIC_ICR_INTPOL_HIGH IS_CLEAR(APIC_ICR_INT_POLARITY)
#define APIC_ICR_LEVEL_ASSERT (1 << 14)
#define APIC_ICR_LEVEL_DEASSERT (0 << 14)
#define APIC_ICR_TRIGGER (1 << 15)
#define APIC_ICR_TM_LEVEL IS_CLEAR(APIC_ICR_TRIGGER)
#define APIC_ICR_TM_EDGE IS_CLEAR(APIC_ICR_TRIGGER)
#define APIC_ICR_INT_MASK (1 << 16)
#define APIC_ICR_DEST_FIELD (0 << 18)
#define APIC_ICR_DEST_SELF (1 << 18)
#define APIC_ICR_DEST_ALL (2 << 18)
#define APIC_ICR_DEST_ALL_BUT_SELF (3 << 18)
#define IA32_APIC_BASE 0x1b
#define IA32_APIC_BASE_ENABLE_BIT 11
/* FIXME we should spread the irqs across as many priority levels as possible
* due to buggy hw */
#define LAPIC_VECTOR(irq) (IRQ0_VECTOR +(irq))
#define IOAPIC_IRQ_STATE_MASKED 0x1
/* currently only 2 interrupt priority levels are used */
#define SPL0 0x0
#define SPLHI 0xF
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struct io_apic io_apic[MAX_NR_IOAPICS];
unsigned nioapics;
struct irq;
typedef void (* eoi_method_t)(struct irq *);
struct irq {
struct io_apic * ioa;
unsigned pin;
unsigned vector;
eoi_method_t eoi;
unsigned state;
};
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static struct irq io_apic_irq[NR_IRQ_VECTORS];
/*
* to make APIC work if SMP is not configured, we need to set the maximal number
* of CPUS to 1, cpuid to return 0 and the current cpu is always BSP
*/
#ifdef CONFIG_SMP
#include "kernel/smp.h"
#endif
#include "kernel/spinlock.h"
#define lapic_write_icr1(val) lapic_write(LAPIC_ICR1, val)
#define lapic_write_icr2(val) lapic_write(LAPIC_ICR2, val)
#define lapic_read_icr1(x) lapic_read(LAPIC_ICR1)
#define lapic_read_icr2(x) lapic_read(LAPIC_ICR2)
#define is_boot_apic(apicid) ((apicid) == bsp_lapic_id)
#define VERBOSE_APIC(x) x
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int ioapic_enabled;
u32_t lapic_addr_vaddr;
vir_bytes lapic_addr;
vir_bytes lapic_eoi_addr;
int bsp_lapic_id;
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static volatile unsigned probe_ticks;
static u64_t tsc0, tsc1;
static u32_t lapic_tctr0, lapic_tctr1;
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static unsigned apic_imcrp;
static const unsigned nlints = 0;
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void arch_eoi(void)
{
apic_eoi();
}
/*
* FIXME this should be a cpulocal variable but there are some problems with
* arch specific cpulocals. As this variable is write-once-read-only it is ok to
* have at as an array until we resolve the cpulocals properly
*/
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static u32_t lapic_bus_freq[CONFIG_MAX_CPUS];
/* the probe period will be roughly 100ms */
#define PROBE_TICKS (system_hz / 10)
#define IOAPIC_IOREGSEL 0x0
#define IOAPIC_IOWIN 0x10
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static u32_t ioapic_read(u32_t ioa_base, u32_t reg)
{
*((volatile u32_t *)(ioa_base + IOAPIC_IOREGSEL)) = (reg & 0xff);
return *(volatile u32_t *)(ioa_base + IOAPIC_IOWIN);
}
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static void ioapic_write(u32_t ioa_base, u8_t reg, u32_t val)
{
*((volatile u32_t *)(ioa_base + IOAPIC_IOREGSEL)) = reg;
*((volatile u32_t *)(ioa_base + IOAPIC_IOWIN)) = val;
}
void lapic_microsec_sleep(unsigned count);
void apic_idt_init(const int reset);
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static void ioapic_enable_pin(vir_bytes ioapic_addr, int pin)
{
u32_t lo = ioapic_read(ioapic_addr, IOAPIC_REDIR_TABLE + pin * 2);
lo &= ~APIC_ICR_INT_MASK;
ioapic_write(ioapic_addr, IOAPIC_REDIR_TABLE + pin * 2, lo);
}
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static void ioapic_disable_pin(vir_bytes ioapic_addr, int pin)
{
u32_t lo = ioapic_read(ioapic_addr, IOAPIC_REDIR_TABLE + pin * 2);
lo |= APIC_ICR_INT_MASK;
ioapic_write(ioapic_addr, IOAPIC_REDIR_TABLE + pin * 2, lo);
}
#if 0
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static void ioapic_redirt_entry_read(void * ioapic_addr,
int entry,
u32_t *hi,
u32_t *lo)
{
*lo = ioapic_read((u32_t)ioapic_addr, (u8_t) (IOAPIC_REDIR_TABLE + entry * 2));
*hi = ioapic_read((u32_t)ioapic_addr, (u8_t) (IOAPIC_REDIR_TABLE + entry * 2 + 1));
}
#endif
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static void ioapic_redirt_entry_write(void * ioapic_addr,
int entry,
u32_t hi,
u32_t lo)
{
#if 0
VERBOSE_APIC(printf("IO apic redir entry %3d "
"write 0x%08x 0x%08x\n", entry, hi, lo));
#endif
ioapic_write((u32_t)ioapic_addr, (u8_t) (IOAPIC_REDIR_TABLE + entry * 2 + 1), hi);
ioapic_write((u32_t)ioapic_addr, (u8_t) (IOAPIC_REDIR_TABLE + entry * 2), lo);
}
#define apic_read_tmr_vector(vec) \
lapic_read(LAPIC_TMR + 0x10 * ((vec) >> 5))
#define apic_read_irr_vector(vec) \
lapic_read(LAPIC_IRR + 0x10 * ((vec) >> 5))
#define apic_read_isr_vector(vec) \
lapic_read(LAPIC_ISR + 0x10 * ((vec) >> 5))
#define lapic_test_delivery_val(val, vector) ((val) & (1 << ((vector) & 0x1f)))
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static void ioapic_eoi_level(struct irq * irq)
{
reg_t tmr;
tmr = apic_read_tmr_vector(irq->vector);
apic_eoi();
/*
* test if it was a level or edge triggered interrupt. If delivered as
* edge exec the workaround for broken chipsets
*/
if (!lapic_test_delivery_val(tmr, irq->vector)) {
int is_masked;
u32_t lo;
panic("EDGE instead of LEVEL!");
lo = ioapic_read(irq->ioa->addr,
IOAPIC_REDIR_TABLE + irq->pin * 2);
is_masked = lo & APIC_ICR_INT_MASK;
/* set mask and edge */
lo |= APIC_ICR_INT_MASK;
lo &= ~APIC_ICR_TRIGGER;
ioapic_write(irq->ioa->addr,
IOAPIC_REDIR_TABLE + irq->pin * 2, lo);
/* set back to level and restore the mask bit */
lo = ioapic_read(irq->ioa->addr,
IOAPIC_REDIR_TABLE + irq->pin * 2);
lo |= APIC_ICR_TRIGGER;
if (is_masked)
lo |= APIC_ICR_INT_MASK;
else
lo &= ~APIC_ICR_INT_MASK;
ioapic_write(irq->ioa->addr,
IOAPIC_REDIR_TABLE + irq->pin * 2, lo);
}
}
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static void ioapic_eoi_edge(__unused struct irq * irq)
{
apic_eoi();
}
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void ioapic_eoi(int irq)
{
if (ioapic_enabled) {
io_apic_irq[irq].eoi(&io_apic_irq[irq]);
}
else
irq_8259_eoi(irq);
}
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void ioapic_set_id(u32_t addr, unsigned int id)
{
ioapic_write(addr, IOAPIC_ID, id << 24);
}
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int ioapic_enable_all(void)
{
i8259_disable();
if (apic_imcrp) {
/* Select IMCR and disconnect 8259s. */
outb(0x22, 0x70);
outb(0x23, 0x01);
}
return ioapic_enabled = 1;
}
/* disables a single IO APIC */
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static void ioapic_disable(struct io_apic * ioapic)
{
unsigned p;
for (p = 0; p < io_apic->pins; p++) {
u32_t low_32, hi_32;
low_32 = ioapic_read((u32_t)ioapic->addr,
(uint8_t) (IOAPIC_REDIR_TABLE + p * 2));
hi_32 = ioapic_read((u32_t)ioapic->addr,
(uint8_t) (IOAPIC_REDIR_TABLE + p * 2 + 1));
if (!(low_32 & APIC_ICR_INT_MASK)) {
low_32 |= APIC_ICR_INT_MASK;
ioapic_write((u32_t)ioapic->addr,
(uint8_t) (IOAPIC_REDIR_TABLE + p * 2 + 1), hi_32);
ioapic_write((u32_t)ioapic->addr,
(uint8_t) (IOAPIC_REDIR_TABLE + p * 2), low_32);
}
}
}
/* disables all IO APICs */
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void ioapic_disable_all(void)
{
unsigned ioa;
if (!ioapic_enabled)
return;
for (ioa = 0 ; ioa < nioapics; ioa++)
ioapic_disable(&io_apic[ioa]);
ioapic_enabled = 0; /* io apic, disabled */
/* Enable 8259 - write 0x00 in OCW1 master and slave. */
if (apic_imcrp) {
outb(0x22, 0x70);
outb(0x23, 0x00);
}
lapic_microsec_sleep(200); /* to enable APIC to switch to PIC */
apic_idt_init(TRUE); /* reset */
idt_reload();
}
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static void ioapic_disable_irq(unsigned irq)
{
if(!(io_apic_irq[irq].ioa)) {
printf("ioapic_disable_irq: no ioa set for irq %d!\n", irq);
return;
}
assert(io_apic_irq[irq].ioa);
ioapic_disable_pin(io_apic_irq[irq].ioa->addr, io_apic_irq[irq].pin);
io_apic_irq[irq].state |= IOAPIC_IRQ_STATE_MASKED;
}
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static void ioapic_enable_irq(unsigned irq)
{
if(!(io_apic_irq[irq].ioa)) {
printf("ioapic_enable_irq: no ioa set for irq %d!\n", irq);
return;
}
assert(io_apic_irq[irq].ioa);
ioapic_enable_pin(io_apic_irq[irq].ioa->addr, io_apic_irq[irq].pin);
io_apic_irq[irq].state &= ~IOAPIC_IRQ_STATE_MASKED;
}
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void ioapic_unmask_irq(unsigned irq)
{
if (ioapic_enabled)
ioapic_enable_irq(irq);
else
/* FIXME unlikely */
irq_8259_unmask(irq);
}
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void ioapic_mask_irq(unsigned irq)
{
if (ioapic_enabled)
ioapic_disable_irq(irq);
else
/* FIXME unlikely */
irq_8259_mask(irq);
}
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unsigned int apicid(void)
{
return lapic_read(LAPIC_ID) >> 24;
}
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static int calib_clk_handler(irq_hook_t * UNUSED(hook))
{
u32_t tcrt;
u64_t tsc;
probe_ticks++;
read_tsc_64(&tsc);
tcrt = lapic_read(LAPIC_TIMER_CCR);
if (probe_ticks == 1) {
lapic_tctr0 = tcrt;
tsc0 = tsc;
}
else if (probe_ticks == PROBE_TICKS) {
lapic_tctr1 = tcrt;
tsc1 = tsc;
stop_8253A_timer();
}
BKL_UNLOCK();
return 1;
}
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static int spurious_irq_handler(irq_hook_t * UNUSED(hook))
{
/*
* Do nothing, only unlock the kernel so we do not deadlock!
*/
BKL_UNLOCK();
return 1;
}
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static void apic_calibrate_clocks(unsigned cpu)
{
u32_t lvtt, val, lapic_delta;
u64_t tsc_delta;
u64_t cpu_freq;
irq_hook_t calib_clk, spurious_irq;
BOOT_VERBOSE(printf("Calibrating clock\n"));
/*
* Set Initial count register to the highest value so it does not
* underflow during the testing period
* */
val = 0xffffffff;
lapic_write (LAPIC_TIMER_ICR, val);
/* Set Current count register */
val = 0;
lapic_write (LAPIC_TIMER_CCR, val);
lvtt = lapic_read(LAPIC_TIMER_DCR) & ~0x0b;
/* Set Divide configuration register to 1 */
lvtt = APIC_TDCR_1;
lapic_write(LAPIC_TIMER_DCR, lvtt);
/*
* mask the APIC timer interrupt in the LVT Timer Register so that we
* don't get an interrupt upon underflow which we don't know how to
* handle right know. If underflow happens, the system will not continue
* as something is wrong with the clock IRQ 0 and we cannot calibrate
* the clock which mean that we cannot run processes
*/
lvtt = lapic_read (LAPIC_LVTTR);
lvtt |= APIC_LVTT_MASK;
lapic_write (LAPIC_LVTTR, lvtt);
/* set the probe, we use the legacy timer, IRQ 0 */
put_irq_handler(&calib_clk, CLOCK_IRQ, calib_clk_handler);
/*
* A spurious interrupt may occur during the clock calibration. Since we
* do this calibration in kernel, we need a special handler which will
* leave the BKL unlocked like the clock handler. This is a corner case,
* boot time only situation
*/
put_irq_handler(&spurious_irq, SPURIOUS_IRQ, spurious_irq_handler);
/* set the PIC timer to get some time */
init_8253A_timer(system_hz);
/*
* We must unlock BKL here as the in-kernel interrupt will lock it
* again. The handler will unlock it after it is done. This is
* absolutely safe as only the BSP is running. It is just a workaround a
* corner case for APIC timer calibration
*/
BKL_UNLOCK();
intr_enable();
/* loop for some time to get a sample */
while(probe_ticks < PROBE_TICKS) {
intr_enable();
}
intr_disable();
BKL_LOCK();
/* remove the probe */
rm_irq_handler(&calib_clk);
rm_irq_handler(&spurious_irq);
lapic_delta = lapic_tctr0 - lapic_tctr1;
tsc_delta = sub64(tsc1, tsc0);
NMI watchdog is an awesome feature for debugging locked up kernels. There is not that much use for it on a single CPU, however, deadlock between kernel and system task can be delected. Or a runaway loop. If a kernel gets locked up the timer interrupts don't occure (as all interrupts are disabled in kernel mode). The only chance is to interrupt the kernel by a non-maskable interrupt. This patch generates NMIs using performance counters. It uses the most widely available performace counters. As the performance counters are highly model-specific this patch is not guaranteed to work on every machine. Unfortunately this is also true for KVM :-/ On the other hand adding this feature for other models is not extremely difficult and the framework makes it hopefully easy enough. Depending on the frequency of the CPU an NMI is generated at most about every 0.5s If the cpu's speed is less then 2Ghz it is generated at most every 1s. In general an NMI is generated much less often as the performance counter counts down only if the cpu is not idle. Therefore the overhead of this feature is fairly minimal even if the load is high. Uppon detecting that the kernel is locked up the kernel dumps the state of the kernel registers and panics. Local APIC must be enabled for the watchdog to work. The code is _always_ compiled in, however, it is only enabled if watchdog=<non-zero> is set in the boot monitor. One corner case is serial console debugging. As dumping a lot of stuff to the serial link may take a lot of time, the watchdog does not detect lockups during this time!!! as it would result in too many false positives. 10 nmi have to be handled before the lockup is detected. This means something between ~5s to 10s. Another corner case is that the watchdog is enabled only after the paging is enabled as it would be pure madness to try to get it right.
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lapic_bus_freq[cpuid] = system_hz * lapic_delta / (PROBE_TICKS - 1);
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BOOT_VERBOSE(printf("APIC bus freq %u MHz\n",
NMI watchdog is an awesome feature for debugging locked up kernels. There is not that much use for it on a single CPU, however, deadlock between kernel and system task can be delected. Or a runaway loop. If a kernel gets locked up the timer interrupts don't occure (as all interrupts are disabled in kernel mode). The only chance is to interrupt the kernel by a non-maskable interrupt. This patch generates NMIs using performance counters. It uses the most widely available performace counters. As the performance counters are highly model-specific this patch is not guaranteed to work on every machine. Unfortunately this is also true for KVM :-/ On the other hand adding this feature for other models is not extremely difficult and the framework makes it hopefully easy enough. Depending on the frequency of the CPU an NMI is generated at most about every 0.5s If the cpu's speed is less then 2Ghz it is generated at most every 1s. In general an NMI is generated much less often as the performance counter counts down only if the cpu is not idle. Therefore the overhead of this feature is fairly minimal even if the load is high. Uppon detecting that the kernel is locked up the kernel dumps the state of the kernel registers and panics. Local APIC must be enabled for the watchdog to work. The code is _always_ compiled in, however, it is only enabled if watchdog=<non-zero> is set in the boot monitor. One corner case is serial console debugging. As dumping a lot of stuff to the serial link may take a lot of time, the watchdog does not detect lockups during this time!!! as it would result in too many false positives. 10 nmi have to be handled before the lockup is detected. This means something between ~5s to 10s. Another corner case is that the watchdog is enabled only after the paging is enabled as it would be pure madness to try to get it right.
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lapic_bus_freq[cpuid] / 1000000));
cpu_freq = mul64(div64u64(tsc_delta, PROBE_TICKS - 1), make64(system_hz, 0));
NMI watchdog is an awesome feature for debugging locked up kernels. There is not that much use for it on a single CPU, however, deadlock between kernel and system task can be delected. Or a runaway loop. If a kernel gets locked up the timer interrupts don't occure (as all interrupts are disabled in kernel mode). The only chance is to interrupt the kernel by a non-maskable interrupt. This patch generates NMIs using performance counters. It uses the most widely available performace counters. As the performance counters are highly model-specific this patch is not guaranteed to work on every machine. Unfortunately this is also true for KVM :-/ On the other hand adding this feature for other models is not extremely difficult and the framework makes it hopefully easy enough. Depending on the frequency of the CPU an NMI is generated at most about every 0.5s If the cpu's speed is less then 2Ghz it is generated at most every 1s. In general an NMI is generated much less often as the performance counter counts down only if the cpu is not idle. Therefore the overhead of this feature is fairly minimal even if the load is high. Uppon detecting that the kernel is locked up the kernel dumps the state of the kernel registers and panics. Local APIC must be enabled for the watchdog to work. The code is _always_ compiled in, however, it is only enabled if watchdog=<non-zero> is set in the boot monitor. One corner case is serial console debugging. As dumping a lot of stuff to the serial link may take a lot of time, the watchdog does not detect lockups during this time!!! as it would result in too many false positives. 10 nmi have to be handled before the lockup is detected. This means something between ~5s to 10s. Another corner case is that the watchdog is enabled only after the paging is enabled as it would be pure madness to try to get it right.
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cpu_set_freq(cpuid, cpu_freq);
cpu_info[cpuid].freq = div64u(cpu_freq, 1000000);
BOOT_VERBOSE(cpu_print_freq(cpuid));
}
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void lapic_set_timer_one_shot(const u32_t usec)
{
/* sleep in micro seconds */
u32_t lvtt;
u32_t ticks_per_us;
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const u8_t cpu = cpuid;
ticks_per_us = (lapic_bus_freq[cpu] / 1000000) * config_apic_timer_x;
lapic_write(LAPIC_TIMER_ICR, usec * ticks_per_us);
lvtt = APIC_TDCR_1;
lapic_write(LAPIC_TIMER_DCR, lvtt);
/* configure timer as one-shot */
lvtt = APIC_TIMER_INT_VECTOR;
lapic_write(LAPIC_LVTTR, lvtt);
}
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void lapic_set_timer_periodic(const unsigned freq)
{
/* sleep in micro seconds */
u32_t lvtt;
u32_t lapic_ticks_per_clock_tick;
2010-03-27 15:31:00 +01:00
const u8_t cpu = cpuid;
lapic_ticks_per_clock_tick = (lapic_bus_freq[cpu] / freq) * config_apic_timer_x;
lvtt = APIC_TDCR_1;
lapic_write(LAPIC_TIMER_DCR, lvtt);
/* configure timer as periodic */
NMI watchdog is an awesome feature for debugging locked up kernels. There is not that much use for it on a single CPU, however, deadlock between kernel and system task can be delected. Or a runaway loop. If a kernel gets locked up the timer interrupts don't occure (as all interrupts are disabled in kernel mode). The only chance is to interrupt the kernel by a non-maskable interrupt. This patch generates NMIs using performance counters. It uses the most widely available performace counters. As the performance counters are highly model-specific this patch is not guaranteed to work on every machine. Unfortunately this is also true for KVM :-/ On the other hand adding this feature for other models is not extremely difficult and the framework makes it hopefully easy enough. Depending on the frequency of the CPU an NMI is generated at most about every 0.5s If the cpu's speed is less then 2Ghz it is generated at most every 1s. In general an NMI is generated much less often as the performance counter counts down only if the cpu is not idle. Therefore the overhead of this feature is fairly minimal even if the load is high. Uppon detecting that the kernel is locked up the kernel dumps the state of the kernel registers and panics. Local APIC must be enabled for the watchdog to work. The code is _always_ compiled in, however, it is only enabled if watchdog=<non-zero> is set in the boot monitor. One corner case is serial console debugging. As dumping a lot of stuff to the serial link may take a lot of time, the watchdog does not detect lockups during this time!!! as it would result in too many false positives. 10 nmi have to be handled before the lockup is detected. This means something between ~5s to 10s. Another corner case is that the watchdog is enabled only after the paging is enabled as it would be pure madness to try to get it right.
2010-01-16 21:53:55 +01:00
lvtt = APIC_LVTT_TM | APIC_TIMER_INT_VECTOR;
lapic_write(LAPIC_LVTTR, lvtt);
lapic_write(LAPIC_TIMER_ICR, lapic_ticks_per_clock_tick);
}
2012-03-25 20:25:53 +02:00
void lapic_stop_timer(void)
{
u32_t lvtt;
lvtt = lapic_read(LAPIC_LVTTR);
lapic_write(LAPIC_LVTTR, lvtt | APIC_LVTT_MASK);
/* zero the current counter so it can be restarted again */
lapic_write(LAPIC_TIMER_ICR, 0);
lapic_write(LAPIC_TIMER_CCR, 0);
}
2012-03-25 20:25:53 +02:00
void lapic_restart_timer(void)
{
/* restart the timer only if the counter reached zero, i.e. expired */
if (lapic_read(LAPIC_TIMER_CCR) == 0)
lapic_set_timer_one_shot(1000000/system_hz);
}
2012-03-25 20:25:53 +02:00
void lapic_microsec_sleep(unsigned count)
{
lapic_set_timer_one_shot(count);
while (lapic_read(LAPIC_TIMER_CCR))
arch_pause();
}
2012-03-25 20:25:53 +02:00
static u32_t lapic_errstatus(void)
{
lapic_write(LAPIC_ESR, 0);
return lapic_read(LAPIC_ESR);
}
2012-08-15 13:12:11 +02:00
#ifdef CONFIG_SMP
2012-03-25 20:25:53 +02:00
static int lapic_disable_in_msr(void)
{
u32_t msr_hi, msr_lo;
ia32_msr_read(IA32_APIC_BASE, &msr_hi, &msr_lo);
msr_lo &= ~(1 << IA32_APIC_BASE_ENABLE_BIT);
ia32_msr_write(IA32_APIC_BASE, msr_hi, msr_lo);
return 1;
}
2012-08-15 13:12:11 +02:00
#endif /* CONFIG_SMP */
2012-03-25 20:25:53 +02:00
void lapic_disable(void)
{
/* Disable current APIC and close interrupts from PIC */
u32_t val;
if (!lapic_addr)
return;
#ifdef CONFIG_SMP
if (cpu_is_bsp(cpuid) && !apic_imcrp)
#endif
{
/* leave it enabled if imcr is not set */
val = lapic_read(LAPIC_LINT0);
val &= ~(APIC_ICR_DM_MASK|APIC_ICR_INT_MASK);
val |= APIC_ICR_DM_EXTINT; /* ExtINT at LINT0 */
lapic_write (LAPIC_LINT0, val);
return;
}
2012-08-15 13:12:11 +02:00
#ifdef CONFIG_SMP
val = lapic_read(LAPIC_LINT0) & 0xFFFE58FF;
val |= APIC_ICR_INT_MASK;
lapic_write (LAPIC_LINT0, val);
val = lapic_read(LAPIC_LINT1) & 0xFFFE58FF;
val |= APIC_ICR_INT_MASK;
lapic_write (LAPIC_LINT1, val);
val = lapic_read(LAPIC_SIVR) & 0xFFFFFF00;
val &= ~APIC_ENABLE;
lapic_write(LAPIC_SIVR, val);
lapic_disable_in_msr();
2012-08-15 13:12:11 +02:00
#endif /* CONFIG_SMP */
}
2012-03-25 20:25:53 +02:00
static int lapic_enable_in_msr(void)
{
u32_t msr_hi, msr_lo;
ia32_msr_read(IA32_APIC_BASE, &msr_hi, &msr_lo);
#if 0
u32_t addr;
/*FIXME this is a problem on AP */
/*
* FIXME if the location is different (unlikely) then the one we expect,
* update it
*/
addr = (msr_lo >> 12) | ((msr_hi & 0xf) << 20);
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
if (addr != (lapic_addr >> 12)) {
if (msr_hi & 0xf) {
printf("ERROR : APIC address needs more then 32 bits\n");
return 0;
}
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
lapic_addr = msr_lo & ~((1 << 12) - 1);
}
#endif
msr_lo |= (1 << IA32_APIC_BASE_ENABLE_BIT);
ia32_msr_write(IA32_APIC_BASE, msr_hi, msr_lo);
return 1;
}
2012-03-25 20:25:53 +02:00
int lapic_enable(unsigned cpu)
{
u32_t val, nlvt;
if (!lapic_addr)
return 0;
cpu_has_tsc = _cpufeature(_CPUF_I386_TSC);
if (!cpu_has_tsc) {
printf("CPU lacks timestamp counter, "
"cannot calibrate LAPIC timer\n");
return 0;
}
if (!lapic_enable_in_msr())
return 0;
/* set the highest priority for ever */
lapic_write(LAPIC_TPR, 0x0);
lapic_eoi_addr = LAPIC_EOI;
/* clear error state register. */
val = lapic_errstatus ();
/* Enable Local APIC and set the spurious vector to 0xff. */
val = lapic_read(LAPIC_SIVR);
NMI watchdog is an awesome feature for debugging locked up kernels. There is not that much use for it on a single CPU, however, deadlock between kernel and system task can be delected. Or a runaway loop. If a kernel gets locked up the timer interrupts don't occure (as all interrupts are disabled in kernel mode). The only chance is to interrupt the kernel by a non-maskable interrupt. This patch generates NMIs using performance counters. It uses the most widely available performace counters. As the performance counters are highly model-specific this patch is not guaranteed to work on every machine. Unfortunately this is also true for KVM :-/ On the other hand adding this feature for other models is not extremely difficult and the framework makes it hopefully easy enough. Depending on the frequency of the CPU an NMI is generated at most about every 0.5s If the cpu's speed is less then 2Ghz it is generated at most every 1s. In general an NMI is generated much less often as the performance counter counts down only if the cpu is not idle. Therefore the overhead of this feature is fairly minimal even if the load is high. Uppon detecting that the kernel is locked up the kernel dumps the state of the kernel registers and panics. Local APIC must be enabled for the watchdog to work. The code is _always_ compiled in, however, it is only enabled if watchdog=<non-zero> is set in the boot monitor. One corner case is serial console debugging. As dumping a lot of stuff to the serial link may take a lot of time, the watchdog does not detect lockups during this time!!! as it would result in too many false positives. 10 nmi have to be handled before the lockup is detected. This means something between ~5s to 10s. Another corner case is that the watchdog is enabled only after the paging is enabled as it would be pure madness to try to get it right.
2010-01-16 21:53:55 +01:00
val |= APIC_ENABLE | APIC_SPURIOUS_INT_VECTOR;
val &= ~APIC_FOCUS_DISABLED;
lapic_write(LAPIC_SIVR, val);
(void) lapic_read(LAPIC_SIVR);
apic_eoi();
/* Program Logical Destination Register. */
val = lapic_read(LAPIC_LDR) & ~0xFF000000;
val |= (cpu & 0xFF) << 24;
lapic_write(LAPIC_LDR, val);
/* Program Destination Format Register for Flat mode. */
val = lapic_read(LAPIC_DFR) | 0xF0000000;
lapic_write (LAPIC_DFR, val);
val = lapic_read (LAPIC_LVTER) & 0xFFFFFF00;
lapic_write (LAPIC_LVTER, val);
nlvt = (lapic_read(LAPIC_VERSION)>>16) & 0xFF;
if(nlvt >= 4) {
val = lapic_read(LAPIC_LVTTMR);
lapic_write(LAPIC_LVTTMR, val | APIC_ICR_INT_MASK);
}
if(nlvt >= 5) {
val = lapic_read(LAPIC_LVTPCR);
lapic_write(LAPIC_LVTPCR, val | APIC_ICR_INT_MASK);
}
/* setup TPR to allow all interrupts. */
val = lapic_read (LAPIC_TPR);
/* accept all interrupts */
lapic_write (LAPIC_TPR, val & ~0xFF);
(void) lapic_read (LAPIC_SIVR);
apic_eoi();
apic_calibrate_clocks(cpu);
BOOT_VERBOSE(printf("APIC timer calibrated\n"));
return 1;
}
2012-03-25 20:25:53 +02:00
void apic_spurios_intr_handler(void)
{
static unsigned x;
x++;
if (x == 1 || (x % 100) == 0)
printf("WARNING spurious interrupt(s) %d on cpu %d\n", x, cpuid);
}
2012-03-25 20:25:53 +02:00
void apic_error_intr_handler(void)
{
static unsigned x;
x++;
if (x == 1 || (x % 100) == 0)
printf("WARNING apic error (0x%x) interrupt(s) %d on cpu %d\n",
lapic_errstatus(), x, cpuid);
}
2012-03-25 20:25:53 +02:00
static struct gate_table_s gate_table_ioapic[] = {
{ apic_hwint0, LAPIC_VECTOR( 0), INTR_PRIVILEGE },
{ apic_hwint1, LAPIC_VECTOR( 1), INTR_PRIVILEGE },
{ apic_hwint2, LAPIC_VECTOR( 2), INTR_PRIVILEGE },
{ apic_hwint3, LAPIC_VECTOR( 3), INTR_PRIVILEGE },
{ apic_hwint4, LAPIC_VECTOR( 4), INTR_PRIVILEGE },
{ apic_hwint5, LAPIC_VECTOR( 5), INTR_PRIVILEGE },
{ apic_hwint6, LAPIC_VECTOR( 6), INTR_PRIVILEGE },
{ apic_hwint7, LAPIC_VECTOR( 7), INTR_PRIVILEGE },
{ apic_hwint8, LAPIC_VECTOR( 8), INTR_PRIVILEGE },
{ apic_hwint9, LAPIC_VECTOR( 9), INTR_PRIVILEGE },
{ apic_hwint10, LAPIC_VECTOR(10), INTR_PRIVILEGE },
{ apic_hwint11, LAPIC_VECTOR(11), INTR_PRIVILEGE },
{ apic_hwint12, LAPIC_VECTOR(12), INTR_PRIVILEGE },
{ apic_hwint13, LAPIC_VECTOR(13), INTR_PRIVILEGE },
{ apic_hwint14, LAPIC_VECTOR(14), INTR_PRIVILEGE },
{ apic_hwint15, LAPIC_VECTOR(15), INTR_PRIVILEGE },
{ apic_hwint16, LAPIC_VECTOR(16), INTR_PRIVILEGE },
{ apic_hwint17, LAPIC_VECTOR(17), INTR_PRIVILEGE },
{ apic_hwint18, LAPIC_VECTOR(18), INTR_PRIVILEGE },
{ apic_hwint19, LAPIC_VECTOR(19), INTR_PRIVILEGE },
{ apic_hwint20, LAPIC_VECTOR(20), INTR_PRIVILEGE },
{ apic_hwint21, LAPIC_VECTOR(21), INTR_PRIVILEGE },
{ apic_hwint22, LAPIC_VECTOR(22), INTR_PRIVILEGE },
{ apic_hwint23, LAPIC_VECTOR(23), INTR_PRIVILEGE },
{ apic_hwint24, LAPIC_VECTOR(24), INTR_PRIVILEGE },
{ apic_hwint25, LAPIC_VECTOR(25), INTR_PRIVILEGE },
{ apic_hwint26, LAPIC_VECTOR(26), INTR_PRIVILEGE },
{ apic_hwint27, LAPIC_VECTOR(27), INTR_PRIVILEGE },
{ apic_hwint28, LAPIC_VECTOR(28), INTR_PRIVILEGE },
{ apic_hwint29, LAPIC_VECTOR(29), INTR_PRIVILEGE },
{ apic_hwint30, LAPIC_VECTOR(30), INTR_PRIVILEGE },
{ apic_hwint31, LAPIC_VECTOR(31), INTR_PRIVILEGE },
{ apic_hwint32, LAPIC_VECTOR(32), INTR_PRIVILEGE },
{ apic_hwint33, LAPIC_VECTOR(33), INTR_PRIVILEGE },
{ apic_hwint34, LAPIC_VECTOR(34), INTR_PRIVILEGE },
{ apic_hwint35, LAPIC_VECTOR(35), INTR_PRIVILEGE },
{ apic_hwint36, LAPIC_VECTOR(36), INTR_PRIVILEGE },
{ apic_hwint37, LAPIC_VECTOR(37), INTR_PRIVILEGE },
{ apic_hwint38, LAPIC_VECTOR(38), INTR_PRIVILEGE },
{ apic_hwint39, LAPIC_VECTOR(39), INTR_PRIVILEGE },
{ apic_hwint40, LAPIC_VECTOR(40), INTR_PRIVILEGE },
{ apic_hwint41, LAPIC_VECTOR(41), INTR_PRIVILEGE },
{ apic_hwint42, LAPIC_VECTOR(42), INTR_PRIVILEGE },
{ apic_hwint43, LAPIC_VECTOR(43), INTR_PRIVILEGE },
{ apic_hwint44, LAPIC_VECTOR(44), INTR_PRIVILEGE },
{ apic_hwint45, LAPIC_VECTOR(45), INTR_PRIVILEGE },
{ apic_hwint46, LAPIC_VECTOR(46), INTR_PRIVILEGE },
{ apic_hwint47, LAPIC_VECTOR(47), INTR_PRIVILEGE },
{ apic_hwint48, LAPIC_VECTOR(48), INTR_PRIVILEGE },
{ apic_hwint49, LAPIC_VECTOR(49), INTR_PRIVILEGE },
{ apic_hwint50, LAPIC_VECTOR(50), INTR_PRIVILEGE },
{ apic_hwint51, LAPIC_VECTOR(51), INTR_PRIVILEGE },
{ apic_hwint52, LAPIC_VECTOR(52), INTR_PRIVILEGE },
{ apic_hwint53, LAPIC_VECTOR(53), INTR_PRIVILEGE },
{ apic_hwint54, LAPIC_VECTOR(54), INTR_PRIVILEGE },
{ apic_hwint55, LAPIC_VECTOR(55), INTR_PRIVILEGE },
{ apic_hwint56, LAPIC_VECTOR(56), INTR_PRIVILEGE },
{ apic_hwint57, LAPIC_VECTOR(57), INTR_PRIVILEGE },
{ apic_hwint58, LAPIC_VECTOR(58), INTR_PRIVILEGE },
{ apic_hwint59, LAPIC_VECTOR(59), INTR_PRIVILEGE },
{ apic_hwint60, LAPIC_VECTOR(60), INTR_PRIVILEGE },
{ apic_hwint61, LAPIC_VECTOR(61), INTR_PRIVILEGE },
{ apic_hwint62, LAPIC_VECTOR(62), INTR_PRIVILEGE },
{ apic_hwint63, LAPIC_VECTOR(63), INTR_PRIVILEGE },
{ apic_spurios_intr, APIC_SPURIOUS_INT_VECTOR, INTR_PRIVILEGE },
{ apic_error_intr, APIC_ERROR_INT_VECTOR, INTR_PRIVILEGE },
{ NULL, 0, 0}
};
2012-03-25 20:25:53 +02:00
static struct gate_table_s gate_table_common[] = {
{ ipc_entry_softint_orig, IPC_VECTOR_ORIG, USER_PRIVILEGE },
{ kernel_call_entry_orig, KERN_CALL_VECTOR_ORIG, USER_PRIVILEGE },
{ ipc_entry_softint_um, IPC_VECTOR_UM, USER_PRIVILEGE },
{ kernel_call_entry_um, KERN_CALL_VECTOR_UM, USER_PRIVILEGE },
{ NULL, 0, 0}
};
#ifdef CONFIG_SMP
2012-03-25 20:25:53 +02:00
static struct gate_table_s gate_table_smp[] = {
{ apic_ipi_sched_intr, APIC_SMP_SCHED_PROC_VECTOR, INTR_PRIVILEGE },
{ apic_ipi_halt_intr, APIC_SMP_CPU_HALT_VECTOR, INTR_PRIVILEGE },
{ NULL, 0, 0}
};
#endif
2011-07-31 16:20:34 +02:00
#ifdef APIC_DEBUG
2012-03-25 20:25:53 +02:00
static void lapic_set_dummy_handlers(void)
{
char * handler;
int vect = 32; /* skip the reserved vectors */
handler = &lapic_intr_dummy_handles_start;
handler += vect * LAPIC_INTR_DUMMY_HANDLER_SIZE;
for(; handler < &lapic_intr_dummy_handles_end;
handler += LAPIC_INTR_DUMMY_HANDLER_SIZE) {
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
int_gate_idt(vect++, (vir_bytes) handler,
PRESENT | INT_GATE_TYPE |
(INTR_PRIVILEGE << DPL_SHIFT));
}
}
#endif
/* Build descriptors for interrupt gates in IDT. */
2012-03-25 20:25:53 +02:00
void apic_idt_init(const int reset)
{
u32_t val;
/* Set up idt tables for smp mode.
*/
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
int is_bsp;
if (reset) {
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
idt_copy_vectors_pic();
idt_copy_vectors(gate_table_common);
return;
}
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
is_bsp = is_boot_apic(apicid());
2011-07-31 16:20:34 +02:00
#ifdef APIC_DEBUG
if (is_bsp)
printf("APIC debugging is enabled\n");
lapic_set_dummy_handlers();
#endif
/* Build descriptors for interrupt gates in IDT. */
if (ioapic_enabled)
idt_copy_vectors(gate_table_ioapic);
else
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
idt_copy_vectors_pic();
idt_copy_vectors(gate_table_common);
#ifdef CONFIG_SMP
idt_copy_vectors(gate_table_smp);
#endif
/* Setup error interrupt vector */
val = lapic_read(LAPIC_LVTER);
val |= APIC_ERROR_INT_VECTOR;
val &= ~ APIC_ICR_INT_MASK;
lapic_write(LAPIC_LVTER, val);
(void) lapic_read(LAPIC_LVTER);
/* configure the timer interupt handler */
if (is_bsp) {
BOOT_VERBOSE(printf("Initiating APIC timer handler\n"));
/* register the timer interrupt handler for this CPU */
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
int_gate_idt(APIC_TIMER_INT_VECTOR, (vir_bytes) lapic_timer_int_handler,
PRESENT | INT_GATE_TYPE | (INTR_PRIVILEGE << DPL_SHIFT));
}
}
2012-03-25 20:25:53 +02:00
static int acpi_get_ioapics(struct io_apic * ioa, unsigned * nioa, unsigned max)
{
unsigned n = 0;
struct acpi_madt_ioapic * acpi_ioa;
while (n < max) {
acpi_ioa = acpi_get_ioapic_next();
if (acpi_ioa == NULL)
break;
assert(acpi_ioa->address);
ioa[n].id = acpi_ioa->id;
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
ioa[n].addr = acpi_ioa->address;
ioa[n].paddr = (phys_bytes) acpi_ioa->address;
ioa[n].gsi_base = acpi_ioa->global_int_base;
ioa[n].pins = ((ioapic_read(ioa[n].addr,
IOAPIC_VERSION) & 0xff0000) >> 16)+1;
printf("IO APIC idx %d id %d addr 0x%lx paddr 0x%lx pins %d\n",
n, acpi_ioa->id, ioa[n].addr, ioa[n].paddr,
ioa[n].pins);
n++;
}
*nioa = n;
return n;
}
2012-03-25 20:25:53 +02:00
int detect_ioapics(void)
{
int status;
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
if (machine.acpi_rsdp) {
status = acpi_get_ioapics(io_apic, &nioapics, MAX_NR_IOAPICS);
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
} else {
2011-07-18 19:44:17 +02:00
status = 0;
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
}
if (!status) {
/* try something different like MPS */
}
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
return status;
}
#ifdef CONFIG_SMP
2012-03-25 20:25:53 +02:00
void apic_send_ipi(unsigned vector, unsigned cpu, int type)
{
u32_t icr1, icr2;
if (ncpus == 1)
/* no need of sending an IPI */
return;
while (lapic_read_icr1() & APIC_ICR_DELIVERY_PENDING)
arch_pause();
icr1 = lapic_read_icr1() & 0xFFF0F800;
icr2 = lapic_read_icr2() & 0xFFFFFF;
switch (type) {
case APIC_IPI_DEST:
if (!cpu_is_ready(cpu))
return;
lapic_write_icr2(icr2 | (cpuid2apicid[cpu] << 24));
lapic_write_icr1(icr1 | APIC_ICR_DEST_FIELD | vector);
break;
case APIC_IPI_SELF:
lapic_write_icr2(icr2);
lapic_write_icr1(icr1 | APIC_ICR_DEST_SELF | vector);
break;
case APIC_IPI_TO_ALL_BUT_SELF:
lapic_write_icr2(icr2);
lapic_write_icr1(icr1 | APIC_ICR_DEST_ALL_BUT_SELF | vector);
break;
case APIC_IPI_TO_ALL:
lapic_write_icr2(icr2);
lapic_write_icr1(icr1 | APIC_ICR_DEST_ALL | vector);
break;
default:
printf("WARNING : unknown send ipi type request\n");
}
}
2012-03-25 20:25:53 +02:00
int apic_send_startup_ipi(unsigned cpu, phys_bytes trampoline)
{
int timeout;
u32_t errstatus = 0;
int i;
/* INIT-SIPI-SIPI sequence */
for (i = 0; i < 2; i++) {
u32_t val;
/* clear err status */
lapic_errstatus();
/* set target pe */
val = lapic_read(LAPIC_ICR2) & 0xFFFFFF;
val |= cpuid2apicid[cpu] << 24;
lapic_write(LAPIC_ICR2, val);
/* send SIPI */
val = lapic_read(LAPIC_ICR1) & 0xFFF32000;
val |= APIC_ICR_LEVEL_ASSERT |APIC_ICR_DM_STARTUP;
val |= (((u32_t)trampoline >> 12)&0xff);
lapic_write(LAPIC_ICR1, val);
timeout = 1000;
/* wait for 200 micro-seconds*/
lapic_microsec_sleep (200);
errstatus = 0;
while ((lapic_read(LAPIC_ICR1) & APIC_ICR_DELIVERY_PENDING) &&
!errstatus) {
errstatus = lapic_errstatus();
timeout--;
if (!timeout) break;
}
/* skip this one and continue with another cpu */
if (errstatus)
return -1;
}
return 0;
}
2012-03-25 20:25:53 +02:00
int apic_send_init_ipi(unsigned cpu, phys_bytes trampoline)
{
u32_t ptr, errstatus = 0;
int timeout;
/* set the warm reset vector */
ptr = (u32_t)(trampoline & 0xF);
phys_copy(0x467, vir2phys(&ptr), sizeof(u16_t ));
ptr = (u32_t)(trampoline >> 4);
phys_copy(0x469, vir2phys(&ptr), sizeof(u16_t ));
/* set shutdown code */
outb (RTC_INDEX, 0xF);
outb (RTC_IO, 0xA);
/* clear error state register. */
(void) lapic_errstatus();
/* assert INIT IPI , No Shorthand, destination mode : physical */
lapic_write(LAPIC_ICR2, (lapic_read (LAPIC_ICR2) & 0xFFFFFF) |
(cpuid2apicid[cpu] << 24));
lapic_write(LAPIC_ICR1, (lapic_read (LAPIC_ICR1) & 0xFFF32000) |
APIC_ICR_DM_INIT | APIC_ICR_TM_LEVEL | APIC_ICR_LEVEL_ASSERT);
timeout = 1000;
/* sleep for 200 micro-seconds */
lapic_microsec_sleep(200);
errstatus = 0;
while ((lapic_read(LAPIC_ICR1) & APIC_ICR_DELIVERY_PENDING) && !errstatus) {
errstatus = lapic_errstatus();
timeout--;
if (!timeout) break;
}
if (errstatus)
return -1; /* to continue with a new processor */
/* clear error state register. */
lapic_errstatus();
/* deassert INIT IPI , No Shorthand, destination mode : physical */
lapic_write(LAPIC_ICR2, (lapic_read (LAPIC_ICR2) & 0xFFFFFF) |
(cpuid2apicid[cpu] << 24));
lapic_write(LAPIC_ICR1, (lapic_read (LAPIC_ICR1) & 0xFFF32000) |
APIC_ICR_DEST_ALL | APIC_ICR_TM_LEVEL);
timeout = 1000;
errstatus = 0;
/* sleep for 200 micro-seconds */
lapic_microsec_sleep(200);
while ((lapic_read(LAPIC_ICR1)&APIC_ICR_DELIVERY_PENDING) && !errstatus) {
errstatus = lapic_errstatus();
timeout--;
if(!timeout) break;
}
if (errstatus)
return -1; /* with the new processor */
/* clear error state register. */
(void) lapic_errstatus();
/* wait 10ms */
lapic_microsec_sleep (10000);
return 0;
}
#endif
#ifndef CONFIG_SMP
2012-03-25 20:25:53 +02:00
int apic_single_cpu_init(void)
{
if (!cpu_feature_apic_on_chip())
return 0;
No more intel/minix segments. This commit removes all traces of Minix segments (the text/data/stack memory map abstraction in the kernel) and significance of Intel segments (hardware segments like CS, DS that add offsets to all addressing before page table translation). This ultimately simplifies the memory layout and addressing and makes the same layout possible on non-Intel architectures. There are only two types of addresses in the world now: virtual and physical; even the kernel and processes have the same virtual address space. Kernel and user processes can be distinguished at a glance as processes won't use 0xF0000000 and above. No static pre-allocated memory sizes exist any more. Changes to booting: . The pre_init.c leaves the kernel and modules exactly as they were left by the bootloader in physical memory . The kernel starts running using physical addressing, loaded at a fixed location given in its linker script by the bootloader. All code and data in this phase are linked to this fixed low location. . It makes a bootstrap pagetable to map itself to a fixed high location (also in linker script) and jumps to the high address. All code and data then use this high addressing. . All code/data symbols linked at the low addresses is prefixed by an objcopy step with __k_unpaged_*, so that that code cannot reference highly-linked symbols (which aren't valid yet) or vice versa (symbols that aren't valid any more). . The two addressing modes are separated in the linker script by collecting the unpaged_*.o objects and linking them with low addresses, and linking the rest high. Some objects are linked twice, once low and once high. . The bootstrap phase passes a lot of information (e.g. free memory list, physical location of the modules, etc.) using the kinfo struct. . After this bootstrap the low-linked part is freed. . The kernel maps in VM into the bootstrap page table so that VM can begin executing. Its first job is to make page tables for all other boot processes. So VM runs before RS, and RS gets a fully dynamic, VM-managed address space. VM gets its privilege info from RS as usual but that happens after RS starts running. . Both the kernel loading VM and VM organizing boot processes happen using the libexec logic. This removes the last reason for VM to still know much about exec() and vm/exec.c is gone. Further Implementation: . All segments are based at 0 and have a 4 GB limit. . The kernel is mapped in at the top of the virtual address space so as not to constrain the user processes. . Processes do not use segments from the LDT at all; there are no segments in the LDT any more, so no LLDT is needed. . The Minix segments T/D/S are gone and so none of the user-space or in-kernel copy functions use them. The copy functions use a process endpoint of NONE to realize it's a physical address, virtual otherwise. . The umap call only makes sense to translate a virtual address to a physical address now. . Segments-related calls like newmap and alloc_segments are gone. . All segments-related translation in VM is gone (vir2map etc). . Initialization in VM is simpler as no moving around is necessary. . VM and all other boot processes can be linked wherever they wish and will be mapped in at the right location by the kernel and VM respectively. Other changes: . The multiboot code is less special: it does not use mb_print for its diagnostics any more but uses printf() as normal, saving the output into the diagnostics buffer, only printing to the screen using the direct print functions if a panic() occurs. . The multiboot code uses the flexible 'free memory map list' style to receive the list of free memory if available. . The kernel determines the memory layout of the processes to a degree: it tells VM where the kernel starts and ends and where the kernel wants the top of the process to be. VM then uses this entire range, i.e. the stack is right at the top, and mmap()ped bits of memory are placed below that downwards, and the break grows upwards. Other Consequences: . Every process gets its own page table as address spaces can't be separated any more by segments. . As all segments are 0-based, there is no distinction between virtual and linear addresses, nor between userspace and kernel addresses. . Less work is done when context switching, leading to a net performance increase. (8% faster on my machine for 'make servers'.) . The layout and configuration of the GDT makes sysenter and syscall possible.
2012-05-07 16:03:35 +02:00
lapic_addr = LOCAL_APIC_DEF_ADDR;
ioapic_enabled = 0;
if (!lapic_enable(0)) {
lapic_addr = 0x0;
return 0;
}
bsp_lapic_id = apicid();
printf("Boot cpu apic id %d\n", bsp_lapic_id);
acpi_init();
if (!detect_ioapics()) {
lapic_disable();
lapic_addr = 0x0;
return 0;
}
ioapic_enable_all();
if (ioapic_enabled)
machine.apic_enabled = 1;
apic_idt_init(0); /* Not a reset ! */
idt_reload();
return 1;
}
#endif
2012-03-25 20:25:53 +02:00
static eoi_method_t set_eoi_method(unsigned irq)
{
/*
* in APIC mode the lowest 16 IRQs are reserved for legacy (E)ISA edge
* triggered interrupts. All the rest is for PCI level triggered
* interrupts
*/
if (irq < 16)
return ioapic_eoi_edge;
else
return ioapic_eoi_level;
}
2012-03-25 20:25:53 +02:00
void set_irq_redir_low(unsigned irq, u32_t * low)
{
u32_t val = 0;
/* clear the polarity, trigger, mask and vector fields */
val &= ~(APIC_ICR_VECTOR | APIC_ICR_INT_MASK |
APIC_ICR_TRIGGER | APIC_ICR_INT_POLARITY);
if (irq < 16) {
/* ISA active-high */
val &= ~APIC_ICR_INT_POLARITY;
/* ISA edge triggered */
val &= ~APIC_ICR_TRIGGER;
}
else {
/* PCI active-low */
val |= APIC_ICR_INT_POLARITY;
/* PCI level triggered */
val |= APIC_ICR_TRIGGER;
}
val |= io_apic_irq[irq].vector;
*low = val;
}
2012-03-25 20:25:53 +02:00
void ioapic_set_irq(unsigned irq)
{
unsigned ioa;
assert(irq < NR_IRQ_VECTORS);
/* shared irq, already set */
if (io_apic_irq[irq].ioa && io_apic_irq[irq].eoi)
return;
assert(!io_apic_irq[irq].ioa || !io_apic_irq[irq].eoi);
for (ioa = 0; ioa < nioapics; ioa++) {
if (io_apic[ioa].gsi_base <= irq &&
io_apic[ioa].gsi_base +
io_apic[ioa].pins > irq) {
u32_t hi_32, low_32;
io_apic_irq[irq].ioa = &io_apic[ioa];
io_apic_irq[irq].pin = irq - io_apic[ioa].gsi_base;
io_apic_irq[irq].eoi = set_eoi_method(irq);
io_apic_irq[irq].vector = LAPIC_VECTOR(irq);
set_irq_redir_low(irq, &low_32);
/*
* route the interrupts to the bsp by default
*/
hi_32 = bsp_lapic_id << 24;
ioapic_redirt_entry_write((void *) io_apic[ioa].addr,
io_apic_irq[irq].pin, hi_32, low_32);
}
}
}
2012-03-25 20:25:53 +02:00
void ioapic_unset_irq(unsigned irq)
{
assert(irq < NR_IRQ_VECTORS);
ioapic_disable_irq(irq);
io_apic_irq[irq].ioa = NULL;
io_apic_irq[irq].eoi = NULL;
}
2012-03-25 20:25:53 +02:00
void ioapic_reset_pic(void)
{
apic_idt_init(TRUE); /* reset */
idt_reload();
/* Enable 8259 - write 0x00 in OCW1
* master and slave. */
outb(0x22, 0x70);
outb(0x23, 0x00);
}
2012-03-25 20:25:53 +02:00
static void irq_lapic_status(int irq)
{
u32_t lo;
reg_t tmr, irr, isr;
int vector;
struct irq * intr;
intr = &io_apic_irq[irq];
if (!intr->ioa)
return;
vector = LAPIC_VECTOR(irq);
tmr = apic_read_tmr_vector(vector);
irr = apic_read_irr_vector(vector);
isr = apic_read_isr_vector(vector);
if (lapic_test_delivery_val(isr, vector)) {
printf("IRQ %d vec %d trigger %s irr %d isr %d\n",
irq, vector,
lapic_test_delivery_val(tmr, vector) ?
"level" : "edge",
lapic_test_delivery_val(irr, vector) ? 1 : 0,
lapic_test_delivery_val(isr, vector) ? 1 : 0);
} else {
printf("IRQ %d vec %d irr %d\n",
irq, vector,
lapic_test_delivery_val(irr, vector) ? 1 : 0);
}
lo = ioapic_read(intr->ioa->addr,
IOAPIC_REDIR_TABLE + intr->pin * 2);
printf("\tpin %2d vec 0x%02x ioa %d redir_lo 0x%08x %s\n",
intr->pin,
intr->vector,
intr->ioa->id,
lo,
intr->state & IOAPIC_IRQ_STATE_MASKED ?
"masked" : "unmasked");
}
2012-03-25 20:25:53 +02:00
void dump_apic_irq_state(void)
{
int irq;
printf("--- IRQs state dump ---\n");
for (irq = 0; irq < NR_IRQ_VECTORS; irq++) {
irq_lapic_status(irq);
}
printf("--- all ---\n");
}