xv6-cs450/lapic.c
kaashoek f70172129c run without lapic and ioapic, if they are not present
if no lapic available, use 8253pit for clock
now xv6 runs both on qemu (uniprocessor) and bochs (uniprocessor and MP)
2006-09-07 01:37:58 +00:00

216 lines
5.7 KiB
C

#include "types.h"
#include "mp.h"
#include "defs.h"
#include "param.h"
#include "x86.h"
#include "traps.h"
#include "mmu.h"
#include "proc.h"
enum { // Local APIC registers
LAPIC_ID = 0x0020, // ID
LAPIC_VER = 0x0030, // Version
LAPIC_TPR = 0x0080, // Task Priority
LAPIC_APR = 0x0090, // Arbitration Priority
LAPIC_PPR = 0x00A0, // Processor Priority
LAPIC_EOI = 0x00B0, // EOI
LAPIC_LDR = 0x00D0, // Logical Destination
LAPIC_DFR = 0x00E0, // Destination Format
LAPIC_SVR = 0x00F0, // Spurious Interrupt Vector
LAPIC_ISR = 0x0100, // Interrupt Status (8 registers)
LAPIC_TMR = 0x0180, // Trigger Mode (8 registers)
LAPIC_IRR = 0x0200, // Interrupt Request (8 registers)
LAPIC_ESR = 0x0280, // Error Status
LAPIC_ICRLO = 0x0300, // Interrupt Command
LAPIC_ICRHI = 0x0310, // Interrupt Command [63:32]
LAPIC_TIMER = 0x0320, // Local Vector Table 0 (TIMER)
LAPIC_PCINT = 0x0340, // Performance Counter LVT
LAPIC_LINT0 = 0x0350, // Local Vector Table 1 (LINT0)
LAPIC_LINT1 = 0x0360, // Local Vector Table 2 (LINT1)
LAPIC_ERROR = 0x0370, // Local Vector Table 3 (ERROR)
LAPIC_TICR = 0x0380, // Timer Initial Count
LAPIC_TCCR = 0x0390, // Timer Current Count
LAPIC_TDCR = 0x03E0, // Timer Divide Configuration
};
enum { // LAPIC_SVR
LAPIC_ENABLE = 0x00000100, // Unit Enable
LAPIC_FOCUS = 0x00000200, // Focus Processor Checking Disable
};
enum { // LAPIC_ICRLO
// [14] IPI Trigger Mode Level (RW)
LAPIC_DEASSERT = 0x00000000, // Deassert level-sensitive interrupt
LAPIC_ASSERT = 0x00004000, // Assert level-sensitive interrupt
// [17:16] Remote Read Status
LAPIC_INVALID = 0x00000000, // Invalid
LAPIC_WAIT = 0x00010000, // In-Progress
LAPIC_VALID = 0x00020000, // Valid
// [19:18] Destination Shorthand
LAPIC_FIELD = 0x00000000, // No shorthand
LAPIC_SELF = 0x00040000, // Self is single destination
LAPIC_ALLINC = 0x00080000, // All including self
LAPIC_ALLEXC = 0x000C0000, // All Excluding self
};
enum { // LAPIC_ESR
LAPIC_SENDCS = 0x00000001, // Send CS Error
LAPIC_RCVCS = 0x00000002, // Receive CS Error
LAPIC_SENDACCEPT = 0x00000004, // Send Accept Error
LAPIC_RCVACCEPT = 0x00000008, // Receive Accept Error
LAPIC_SENDVECTOR = 0x00000020, // Send Illegal Vector
LAPIC_RCVVECTOR = 0x00000040, // Receive Illegal Vector
LAPIC_REGISTER = 0x00000080, // Illegal Register Address
};
enum { // LAPIC_TIMER
// [17] Timer Mode (RW)
LAPIC_ONESHOT = 0x00000000, // One-shot
LAPIC_PERIODIC = 0x00020000, // Periodic
// [19:18] Timer Base (RW)
LAPIC_CLKIN = 0x00000000, // use CLKIN as input
LAPIC_TMBASE = 0x00040000, // use TMBASE
LAPIC_DIVIDER = 0x00080000, // use output of the divider
};
enum { // LAPIC_TDCR
LAPIC_X2 = 0x00000000, // divide by 2
LAPIC_X4 = 0x00000001, // divide by 4
LAPIC_X8 = 0x00000002, // divide by 8
LAPIC_X16 = 0x00000003, // divide by 16
LAPIC_X32 = 0x00000008, // divide by 32
LAPIC_X64 = 0x00000009, // divide by 64
LAPIC_X128 = 0x0000000A, // divide by 128
LAPIC_X1 = 0x0000000B, // divide by 1
};
uint *lapicaddr;
static int
lapic_read(int r)
{
return *(lapicaddr+(r/sizeof(*lapicaddr)));
}
static void
lapic_write(int r, int data)
{
*(lapicaddr+(r/sizeof(*lapicaddr))) = data;
}
void
lapic_timerinit(void)
{
if (lapicaddr) {
lapic_write(LAPIC_TDCR, LAPIC_X1);
lapic_write(LAPIC_TIMER, LAPIC_CLKIN | LAPIC_PERIODIC |
(IRQ_OFFSET + IRQ_TIMER));
lapic_write(LAPIC_TCCR, 10000000);
lapic_write(LAPIC_TICR, 10000000);
}
}
void
lapic_timerintr(void)
{
if (lapicaddr)
lapic_write(LAPIC_EOI, 0);
}
void
lapic_init(int c)
{
uint r, lvt;
if (lapicaddr == 0)
return;
lapic_write(LAPIC_DFR, 0xFFFFFFFF); // Set dst format register
r = (lapic_read(LAPIC_ID)>>24) & 0xFF; // Read APIC ID
lapic_write(LAPIC_LDR, (1<<r)<<24); // Set logical dst register to r
lapic_write(LAPIC_TPR, 0xFF); // No interrupts for now
// Enable APIC
lapic_write(LAPIC_SVR, LAPIC_ENABLE|(IRQ_OFFSET+IRQ_SPURIOUS));
// In virtual wire mode, set up the LINT0 and LINT1 as follows:
lapic_write(LAPIC_LINT0, APIC_IMASK | APIC_EXTINT);
lapic_write(LAPIC_LINT1, APIC_IMASK | APIC_NMI);
lapic_write(LAPIC_EOI, 0); // Ack any outstanding interrupts.
lvt = (lapic_read(LAPIC_VER)>>16) & 0xFF;
if(lvt >= 4)
lapic_write(LAPIC_PCINT, APIC_IMASK);
lapic_write(LAPIC_ERROR, IRQ_OFFSET+IRQ_ERROR);
lapic_write(LAPIC_ESR, 0);
lapic_read(LAPIC_ESR);
// Issue an INIT Level De-Assert to synchronise arbitration ID's.
lapic_write(LAPIC_ICRHI, 0);
lapic_write(LAPIC_ICRLO, LAPIC_ALLINC|APIC_LEVEL|
LAPIC_DEASSERT|APIC_INIT);
while(lapic_read(LAPIC_ICRLO) & APIC_DELIVS)
;
}
void
lapic_enableintr(void)
{
if (lapicaddr)
lapic_write(LAPIC_TPR, 0);
}
void
lapic_disableintr(void)
{
if (lapicaddr)
lapic_write(LAPIC_TPR, 0xFF);
}
void
lapic_eoi(void)
{
if (lapicaddr)
lapic_write(LAPIC_EOI, 0);
}
int
cpu(void)
{
int x;
if (lapicaddr)
x = (lapic_read(LAPIC_ID)>>24) & 0xFF;
else
x = 0;
return x;
}
void
lapic_startap(uchar apicid, int v)
{
int crhi, i;
volatile int j = 0;
crhi = apicid<<24;
lapic_write(LAPIC_ICRHI, crhi);
lapic_write(LAPIC_ICRLO, LAPIC_FIELD|APIC_LEVEL|
LAPIC_ASSERT|APIC_INIT);
while(j++ < 10000) {;}
lapic_write(LAPIC_ICRLO, LAPIC_FIELD|APIC_LEVEL|
LAPIC_DEASSERT|APIC_INIT);
while(j++ < 1000000) {;}
// in p9 code, this was i < 2, which is what the spec says on page B-3
for(i = 0; i < 1; i++){
lapic_write(LAPIC_ICRHI, crhi);
lapic_write(LAPIC_ICRLO, LAPIC_FIELD|APIC_EDGE|APIC_STARTUP|(v/4096));
while(j++ < 100000) {;}
}
}