minix/kernel/arch/i386/watchdog.c
2010-03-27 14:31:00 +00:00

135 lines
2.8 KiB
C

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