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minix/kernel/arch/i386/apic.c
Tomas Hruby 5ab87a6c38 ioapic - missing volatiles 
leads to a kernel panic when using clang and SMP

reported by trd <trdempsey.201201@gmail.com>
2012-03-29 00:53:38 -07:00

1293 lines
31 KiB
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/*
* APIC handling routines. APIC is a requirement for SMP
*/
#include "kernel/kernel.h"
#include <assert.h>
#include <unistd.h>
#include <minix/portio.h>
#include <minix/syslib.h>
#include <machine/cmos.h>
#include "kernel/proc.h"
#include "kernel/glo.h"
#include "arch_proto.h"
#include <minix/u64.h>
#include "apic.h"
#include "apic_asm.h"
#include "kernel/clock.h"
#include "glo.h"
#include "hw_intr.h"
#include "acpi.h"
#ifdef USE_WATCHDOG
#include "kernel/watchdog.h"
#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
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;
};
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
int ioapic_enabled;
u32_t lapic_addr_vaddr;
vir_bytes lapic_addr;
vir_bytes lapic_eoi_addr;
int bsp_lapic_id;
static volatile unsigned probe_ticks;
static u64_t tsc0, tsc1;
static u32_t lapic_tctr0, lapic_tctr1;
static unsigned apic_imcrp;
static const unsigned nlints = 0;
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
*/
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
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);
}
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);
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);
}
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
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
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)))
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);
}
}
static void ioapic_eoi_edge(__unused struct irq * irq)
{
apic_eoi();
}
void ioapic_eoi(int irq)
{
if (ioapic_enabled) {
io_apic_irq[irq].eoi(&io_apic_irq[irq]);
}
else
irq_8259_eoi(irq);
}
void ioapic_set_id(u32_t addr, unsigned int id)
{
ioapic_write(addr, IOAPIC_ID, id << 24);
}
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 */
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 */
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();
intr_init(INTS_ORIG, 0); /* no auto eoi */
}
static void ioapic_disable_irq(unsigned irq)
{
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;
}
static void ioapic_enable_irq(unsigned irq)
{
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;
}
void ioapic_unmask_irq(unsigned irq)
{
if (ioapic_enabled)
ioapic_enable_irq(irq);
else
/* FIXME unlikely */
irq_8259_unmask(irq);
}
void ioapic_mask_irq(unsigned irq)
{
if (ioapic_enabled)
ioapic_disable_irq(irq);
else
/* FIXME unlikely */
irq_8259_mask(irq);
}
unsigned int apicid(void)
{
return lapic_read(LAPIC_ID) >> 24;
}
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;
}
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;
}
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);
lapic_bus_freq[cpuid] = system_hz * lapic_delta / (PROBE_TICKS - 1);
BOOT_VERBOSE(printf("APIC bus freq %u MHz\n",
lapic_bus_freq[cpuid] / 1000000));
cpu_freq = mul64(div64u64(tsc_delta, PROBE_TICKS - 1), make64(system_hz, 0));
cpu_set_freq(cpuid, cpu_freq);
cpu_info[cpuid].freq = div64u(cpu_freq, 1000000);
BOOT_VERBOSE(cpu_print_freq(cpuid));
}
void lapic_set_timer_one_shot(const u32_t usec)
{
/* sleep in micro seconds */
u32_t lvtt;
u32_t ticks_per_us;
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);
}
void lapic_set_timer_periodic(const unsigned freq)
{
/* sleep in micro seconds */
u32_t lvtt;
u32_t lapic_ticks_per_clock_tick;
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 */
lvtt = APIC_LVTT_TM | APIC_TIMER_INT_VECTOR;
lapic_write(LAPIC_LVTTR, lvtt);
lapic_write(LAPIC_TIMER_ICR, lapic_ticks_per_clock_tick);
}
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);
}
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);
}
void lapic_microsec_sleep(unsigned count)
{
lapic_set_timer_one_shot(count);
while (lapic_read(LAPIC_TIMER_CCR))
arch_pause();
}
static u32_t lapic_errstatus(void)
{
lapic_write(LAPIC_ESR, 0);
return lapic_read(LAPIC_ESR);
}
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;
}
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;
}
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();
}
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);
if (phys2vir(addr) != (lapic_addr >> 12)) {
if (msr_hi & 0xf) {
printf("ERROR : APIC address needs more then 32 bits\n");
return 0;
}
lapic_addr = phys2vir(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;
}
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);
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;
}
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);
}
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);
}
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}
};
static struct gate_table_s gate_table_common[] = {
{ ipc_entry, IPC_VECTOR, USER_PRIVILEGE },
{ kernel_call_entry, KERN_CALL_VECTOR, USER_PRIVILEGE },
{ NULL, 0, 0}
};
#ifdef CONFIG_SMP
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
#ifdef APIC_DEBUG
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) {
int_gate(vect++, (vir_bytes) handler,
PRESENT | INT_GATE_TYPE |
(INTR_PRIVILEGE << DPL_SHIFT));
}
}
#endif
/* Build descriptors for interrupt gates in IDT. */
void apic_idt_init(const int reset)
{
u32_t val;
/* Set up idt tables for smp mode.
*/
int is_bsp = is_boot_apic(apicid());
if (reset) {
idt_copy_vectors(gate_table_pic);
idt_copy_vectors(gate_table_common);
return;
}
#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
idt_copy_vectors(gate_table_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 */
int_gate(APIC_TIMER_INT_VECTOR, (vir_bytes) lapic_timer_int_handler,
PRESENT | INT_GATE_TYPE | (INTR_PRIVILEGE << DPL_SHIFT));
}
}
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;
ioa[n].id = acpi_ioa->id;
ioa[n].addr = phys2vir(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 %d addr 0x%lx paddr 0x%lx pins %d\n",
acpi_ioa->id, ioa[n].addr, ioa[n].paddr,
ioa[n].pins);
n++;
}
*nioa = n;
return n;
}
int detect_ioapics(void)
{
int status;
if (machine.acpi_rsdp)
status = acpi_get_ioapics(io_apic, &nioapics, MAX_NR_IOAPICS);
else
status = 0;
if (!status) {
/* try something different like MPS */
}
return status;
}
#ifdef CONFIG_SMP
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");
}
}
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;
}
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
int apic_single_cpu_init(void)
{
if (!cpu_feature_apic_on_chip())
return 0;
lapic_addr = phys2vir(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
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;
}
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;
}
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);
}
}
}
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;
}
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);
intr_init(INTS_ORIG, 0); /* no auto eoi */
}
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");
}
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");
}
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