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
54 lines
1.4 KiB
C
54 lines
1.4 KiB
C
/*
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* This is arch independent NMI watchdog implementaion part. It is used to
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* detect kernel lockups and help debugging. each architecture must add its own
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* low level code that triggers periodic checks
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*/
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#include "watchdog.h"
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#include "arch/i386/glo.h"
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unsigned watchdog_local_timer_ticks = 0U;
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struct arch_watchdog *watchdog;
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int watchdog_enabled;
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void nmi_watchdog_handler(struct nmi_frame * frame)
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{
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/* FIXME this should be CPU local */
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static unsigned no_ticks;
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static unsigned last_tick_count = (unsigned) -1;
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/*
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* when debugging on serial console, printing takes a lot of time some
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* times while the kernel is certainly not locked up. We don't want to
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* report a lockup in such situation
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*/
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if (serial_debug_active)
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goto reset_and_continue;
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if (last_tick_count != watchdog_local_timer_ticks) {
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if (no_ticks == 1) {
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printf("watchdog : kernel unlocked\n");
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no_ticks = 0;
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}
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/* we are still ticking, everything seems good */
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last_tick_count = watchdog_local_timer_ticks;
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goto reset_and_continue;
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}
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/*
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* if watchdog_local_timer_ticks didn't changed since last time, give it
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* some more time and only if it still dead, trigger the watchdog alarm
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*/
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if (++no_ticks < 10) {
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if (no_ticks == 1)
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printf("WARNING watchdog : possible kernel lockup\n");
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goto reset_and_continue;
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}
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arch_watchdog_lockup(frame);
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reset_and_continue:
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if (watchdog->reinit)
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watchdog->reinit(cpuid);
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}
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