62c666566e
- kernel detects CPUs by searching ACPI tables for local apic nodes - each CPU has its own TSS that points to its own stack. All cpus boot on the same boot stack (in sequence) but switch to its private stack as soon as they can. - final booting code in main() placed in bsp_finish_booting() which is executed only after the BSP switches to its final stack - apic functions to send startup interrupts - assembler functions to handle CPU features not needed for single cpu mode like memory barries, HT detection etc. - new files kernel/smp.[ch], kernel/arch/i386/arch_smp.c and kernel/arch/i386/include/arch_smp.h - 16-bit trampoline code for the APs. It is executed by each AP after receiving startup IPIs it brings up the CPUs to 32bit mode and let them spin in an infinite loop so they don't do any damage. - implementation of kernel spinlock - CONFIG_SMP and CONFIG_MAX_CPUS set by the build system
137 lines
2.9 KiB
C
137 lines
2.9 KiB
C
#include "kernel/kernel.h"
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#include "kernel/watchdog.h"
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#include "arch_proto.h"
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#include "glo.h"
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#include <minix/minlib.h>
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#include <minix/u64.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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u64_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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while (cpuf.hi || cpuf.lo > 0x7fffffffU)
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cpuf = div64u64(cpuf, 2);
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watchdog->resetval = cpuf.lo;
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ia32_msr_write(MSR_PERFMON_CRT0, 0, -cpuf.lo);
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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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(void) 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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