249 lines
6.8 KiB
C
249 lines
6.8 KiB
C
/*
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* LAPIC
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/kassert.h>
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#include <sys/kdebug.h>
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#include <machine/amd64.h>
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#include <machine/amd64op.h>
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#include <machine/pmap.h>
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#include <machine/trap.h>
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#define CPUID_FLAG_APIC 0x100
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#define IA32_APIC_BASE_MSR 0x1B
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#define IA32_APIC_BASE_MSR_BSP 0x100
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#define IA32_APIC_BASE_MSR_ENABLE 0x800
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#define LAPIC_ID 0x0020 /* CPU ID */
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#define LAPIC_VERSION 0x0030 /* Version */
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#define LAPIC_VERSION_LVTMASK 0x00FF0000
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#define LAPIC_VERSION_LVTSHIFT 0x10
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#define LAPIC_TPR 0x0080 /* Task Priority Register */
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#define LAPIC_EOI 0x00B0 /* End of Interrupt */
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#define LAPIC_SIV 0x00F0 /* Spurious Interrupt Vector */
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#define LAPIC_SIV_ENABLE 0x100
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#define LAPIC_ESR 0x0280 /* Error Status Register */
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#define LAPIC_LVT_CMCI 0x02F0 /* LVT CMCI */
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#define LAPIC_ICR_LO 0x0300 /* Interrupt Command Register */
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#define LAPIC_ICR_HI 0x0310 /* Interrupt Command Register */
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#define LAPIC_ICR_FIXED 0x0000 /* Delivery Mode */
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#define LAPIC_ICR_INIT 0x0500
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#define LAPIC_ICR_STARTUP 0x0600
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#define LAPIC_ICR_ASSERT 0x4000
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#define LAPIC_ICR_TRIG 0x8000
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#define LAPIC_ICR_SELF 0x00080000 /* Destination */
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#define LAPIC_ICR_INCSELF 0x00080000
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#define LAPIC_ICR_EXCSELF 0x000C0000
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#define LAPIC_ICR_DELIVERY_PENDING 0x1000 /* Delivery Pending */
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#define LAPIC_LVT_TIMER 0x0320 /* LVT Timer */
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#define LAPIC_LVT_TIMER_ONESHOT 0x00000000
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#define LAPIC_LVT_TIMER_PERIODIC 0x00020000
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#define LAPIC_LVT_TIMER_TSCDEADLINE 0x00040000
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#define LAPIC_LVT_THERMAL 0x0330 /* LVT Thermal Sensor */
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#define LAPIC_LVT_PMCR 0x0340 /* LVT Performance Monitoring Counter */
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#define LAPIC_LVT_LINT0 0x0350 /* LVT LINT0 */
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#define LAPIC_LVT_LINT1 0x0360 /* LVT LINT1 */
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#define LAPIC_LVT_ERROR 0x0370 /* LVT Error */
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#define LAPIC_LVT_FLAG_MASKED 0x00010000 /* Masked */
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#define LAPIC_LVT_FLAG_NMI 0x00000400 /* NMI */
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#define LAPIC_LVT_FLAG_EXTINT 0x00000700 /* ExtINT */
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#define LAPIC_TICR 0x0380 /* Timer Initial Count Register */
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#define LAPIC_TCCR 0x0390 /* Timer Currnet Count Register */
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#define LAPIC_TDCR 0x03E0 /* Time Divide Configuration Register */
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#define LAPIC_TDCR_X1 0x000B /* Divide counts by 1 */
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bool lapicInitialized = false;
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static uint32_t *
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LAPIC_GetBase()
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{
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uint64_t base = rdmsr(IA32_APIC_BASE_MSR) & 0xFFFFFFFFFFFFF000ULL;
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return (uint32_t *)DMPA2VA(base);
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}
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uint32_t
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LAPIC_Read(uint16_t reg)
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{
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uint32_t volatile *lapic = (uint32_t volatile *) LAPIC_GetBase();
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return lapic[reg >> 2];
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}
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void
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LAPIC_Write(uint16_t reg, uint32_t val)
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{
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uint32_t volatile *lapic = (uint32_t volatile *)LAPIC_GetBase();
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lapic[reg >> 2] = val;
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lapic[LAPIC_ID >> 2];
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}
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uint32_t
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LAPIC_CPU()
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{
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if (lapicInitialized)
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return LAPIC_Read(LAPIC_ID) >> 24;
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else
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return 0;
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}
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void
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LAPIC_SendEOI()
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{
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LAPIC_Write(LAPIC_EOI, 0);
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}
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void
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LAPIC_Periodic(uint64_t rate)
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{
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LAPIC_Write(LAPIC_TDCR, LAPIC_TDCR_X1);
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LAPIC_Write(LAPIC_LVT_TIMER, LAPIC_LVT_TIMER_PERIODIC | T_IRQ_TIMER);
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LAPIC_Write(LAPIC_TICR, rate);
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}
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void
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LAPIC_StartAP(uint8_t apicid, uint32_t addr)
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{
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// Setup CMOS stuff
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outb(0x70, 0x0F);
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outb(0x71, 0x0A);
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uint16_t *cmosStartup = (uint16_t *)DMPA2VA(0x467);
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cmosStartup[0] = 0;
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cmosStartup[1] = addr >> 4;
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// Send INIT
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LAPIC_Write(LAPIC_ICR_HI, apicid << 24);
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LAPIC_Write(LAPIC_ICR_LO, LAPIC_ICR_INIT | LAPIC_ICR_TRIG | LAPIC_ICR_ASSERT);
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// XXX: Delay
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LAPIC_Write(LAPIC_ICR_HI, apicid << 24);
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LAPIC_Write(LAPIC_ICR_LO, LAPIC_ICR_INIT | LAPIC_ICR_TRIG);
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// XXX: Delay
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// Send STARTUP
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LAPIC_Write(LAPIC_ICR_HI, apicid << 24);
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LAPIC_Write(LAPIC_ICR_LO, LAPIC_ICR_STARTUP | (addr >> 12));
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// XXX: Delay
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LAPIC_Write(LAPIC_ICR_HI, apicid << 24);
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LAPIC_Write(LAPIC_ICR_LO, LAPIC_ICR_STARTUP | (addr >> 12));
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// XXX: Delay
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}
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void
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LAPIC_Init()
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{
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uint32_t version;
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uint32_t lvts;
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uint32_t edx;
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uint64_t base;
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cpuid(1, NULL, NULL, NULL, &edx);
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if ((edx & CPUID_FLAG_APIC) == 0)
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Panic("APIC is required!\n");
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// Disable ATPIC
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if (LAPIC_CPU() == 0) {
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outb(0xA1, 0xFF);
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outb(0x21, 0xFF);
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}
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// Enable LAPIC
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base = rdmsr(IA32_APIC_BASE_MSR);
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wrmsr(IA32_APIC_BASE_MSR, base | IA32_APIC_BASE_MSR_ENABLE);
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// Convert to Direct Map Address
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base = DMPA2VA(base);
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lapicInitialized = true;
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kprintf("LAPIC: CPU %d found at 0x%016llx\n", LAPIC_CPU(), base);
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version = LAPIC_Read(LAPIC_VERSION);
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lvts = (version & LAPIC_VERSION_LVTMASK) >> LAPIC_VERSION_LVTSHIFT;
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// Enable interrupts
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LAPIC_Write(LAPIC_SIV, LAPIC_SIV_ENABLE | T_IRQ_SPURIOUS);
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// Error Interrupt
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LAPIC_Write(LAPIC_LVT_ERROR, T_IRQ_ERROR);
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// Setup LINT0/1
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if (LAPIC_CPU() == 0) {
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LAPIC_Write(LAPIC_LVT_LINT0, LAPIC_LVT_FLAG_EXTINT);
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LAPIC_Write(LAPIC_LVT_LINT1, LAPIC_LVT_FLAG_NMI);
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} else {
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LAPIC_Write(LAPIC_LVT_LINT0, LAPIC_LVT_FLAG_MASKED);
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LAPIC_Write(LAPIC_LVT_LINT1, LAPIC_LVT_FLAG_MASKED);
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}
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// Performance Counter Interrupt
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if (lvts >= 4) {
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LAPIC_Write(LAPIC_LVT_PMCR, LAPIC_LVT_FLAG_MASKED);
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}
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// Thermal Interrupt
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if (lvts >= 5) {
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LAPIC_Write(LAPIC_LVT_THERMAL, T_IRQ_THERMAL);
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}
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// Machine Check Interrupt
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if (lvts >= 6) {
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LAPIC_Write(LAPIC_LVT_CMCI, LAPIC_LVT_FLAG_MASKED);
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}
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LAPIC_Periodic(10000000); // XXX: 100 Hz (changes must update trap.c as well)
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// Clear any remaining errors
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LAPIC_Write(LAPIC_ESR, 0);
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LAPIC_Write(LAPIC_ESR, 0);
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LAPIC_Write(LAPIC_ICR_HI, 0);
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LAPIC_Write(LAPIC_ICR_LO, LAPIC_ICR_INCSELF | LAPIC_ICR_INIT | LAPIC_ICR_TRIG);
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while (LAPIC_Read(LAPIC_ICR_LO) & LAPIC_ICR_DELIVERY_PENDING)
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{
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// XXX: Timeout
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}
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LAPIC_SendEOI();
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LAPIC_Write(LAPIC_TPR, 0);
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}
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void
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Debug_LAPIC(int argc, const char *argv[])
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{
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uint32_t version = LAPIC_Read(LAPIC_VERSION);
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uint32_t lvts = (version & LAPIC_VERSION_LVTMASK) >> LAPIC_VERSION_LVTSHIFT;
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kprintf("LAPIC %d\n", LAPIC_CPU());
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kprintf("VERSION: %08x\n", LAPIC_Read(LAPIC_VERSION));
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kprintf("ESR: %08x\n", LAPIC_Read(LAPIC_ESR));
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kprintf("ICRLO: %08x\n", LAPIC_Read(LAPIC_ICR_LO));
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kprintf("ICRHI: %08x\n", LAPIC_Read(LAPIC_ICR_HI));
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kprintf("SIV: %08x\n", LAPIC_Read(LAPIC_SIV));
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kprintf("ERROR: %08x\n", LAPIC_Read(LAPIC_LVT_ERROR));
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if (lvts >= 5) {
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kprintf("THERMAL: %08x\n", LAPIC_Read(LAPIC_LVT_THERMAL));
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}
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kprintf("LINT0: %08x\n", LAPIC_Read(LAPIC_LVT_LINT0));
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kprintf("LINT1: %08x\n", LAPIC_Read(LAPIC_LVT_LINT1));
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if (lvts >= 4) {
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kprintf("PMCR: %08x\n", LAPIC_Read(LAPIC_LVT_PMCR));
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}
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if (lvts >= 6) {
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kprintf("CMCI: %08x\n", LAPIC_Read(LAPIC_LVT_CMCI));
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}
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}
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REGISTER_DBGCMD(lapic, "LAPIC Status", Debug_LAPIC);
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