136 lines
2.8 KiB
C
136 lines
2.8 KiB
C
#include "../../kernel.h"
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#include "../../watchdog.h"
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#include "proto.h"
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#include <minix/minlib.h>
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#include "apic.h"
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#define CPUID_UNHALTED_CORE_CYCLES_AVAILABLE 0
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#define MSR_PERFMON_CRT0 0xc1
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#define MSR_PERFMON_SEL0 0x186
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#define MSR_PERFMON_SEL0_ENABLE (1 << 22)
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/*
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* Intel architecture performance counters watchdog
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*/
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PRIVATE void intel_arch_watchdog_init(int cpu)
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{
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u32_t cpuf;
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u32_t val;
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ia32_msr_write(MSR_PERFMON_CRT0, 0, 0);
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/* Int, OS, USR, Core ccyles */
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val = 1 << 20 | 1 << 17 | 1 << 16 | 0x3c;
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ia32_msr_write(MSR_PERFMON_SEL0, 0, val);
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/*
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* should give as a tick approx. every 0.5-1s, the perf counter has only
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* lowest 31 bits writable :(
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*/
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cpuf = cpu_get_freq(cpu);
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if (cpuf > 0x7fffffffU)
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cpuf >>= 2;
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watchdog->resetval = cpuf;
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ia32_msr_write(MSR_PERFMON_CRT0, 0, -cpuf);
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ia32_msr_write(MSR_PERFMON_SEL0, 0, val | MSR_PERFMON_SEL0_ENABLE);
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/* unmask the performance counter interrupt */
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lapic_write(LAPIC_LVTPCR, APIC_ICR_DM_NMI);
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}
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PRIVATE void intel_arch_watchdog_reinit(const int cpu)
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{
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lapic_write(LAPIC_LVTPCR, APIC_ICR_DM_NMI);
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ia32_msr_write(MSR_PERFMON_CRT0, 0, -watchdog->resetval);
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}
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PRIVATE struct arch_watchdog intel_arch_watchdog = {
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/*.init = */ intel_arch_watchdog_init,
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/*.reinit = */ intel_arch_watchdog_reinit
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};
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int arch_watchdog_init(void)
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{
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u32_t eax, ebx, ecx, edx;
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eax = 0xA;
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_cpuid(&eax, &ebx, &ecx, &edx);
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/* FIXME currently we support only watchdog base on the intel
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* architectural performance counters. Some Intel CPUs don't have this
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* feature
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*/
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if (ebx & (1 << CPUID_UNHALTED_CORE_CYCLES_AVAILABLE))
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return -1;
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if (!((((eax >> 8)) & 0xff) > 0))
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return -1;
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watchdog = &intel_arch_watchdog;
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/* Setup PC tas NMI for watchdog, is is masked for now */
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lapic_write(LAPIC_LVTPCR, APIC_ICR_INT_MASK | APIC_ICR_DM_NMI);
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lapic_read(LAPIC_LVTPCR);
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/* double check if LAPIC is enabled */
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if (lapic_addr && watchdog_enabled && watchdog->init) {
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watchdog->init(cpuid);
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}
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return 0;
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}
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void arch_watchdog_lockup(const struct nmi_frame * frame)
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{
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printf("KERNEL LOCK UP\n"
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"eax 0x%08x\n"
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"ecx 0x%08x\n"
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"edx 0x%08x\n"
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"ebx 0x%08x\n"
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"ebp 0x%08x\n"
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"esi 0x%08x\n"
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"edi 0x%08x\n"
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"gs 0x%08x\n"
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"fs 0x%08x\n"
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"es 0x%08x\n"
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"ds 0x%08x\n"
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"pc 0x%08x\n"
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"cs 0x%08x\n"
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"eflags 0x%08x\n",
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frame->eax,
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frame->ecx,
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frame->edx,
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frame->ebx,
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frame->ebp,
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frame->esi,
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frame->edi,
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frame->gs,
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frame->fs,
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frame->es,
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frame->ds,
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frame->pc,
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frame->cs,
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frame->eflags
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);
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panic("Kernel lockup");
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}
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void i386_watchdog_start(void)
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{
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if (watchdog_enabled) {
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if (arch_watchdog_init()) {
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printf("WARNING watchdog initialization "
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"failed! Disabled\n");
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watchdog_enabled = 0;
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}
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else
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BOOT_VERBOSE(printf("Watchdog enabled\n"););
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}
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}
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