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smp: make cpu internal id match offset into cpu table

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Matheus
2026-09-15 23:40:53 -03:00
parent 74c0bb2450
commit 10cd22207d
1 changed files with 12 additions and 10 deletions
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kernel-src/arch/x86-64/smp.c
+12 -10
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@@ -26,13 +26,9 @@ static void cpuwakeuphalt(struct limine_mp_info *info) {
for (;;) CPU_HALT();
}
static long next_id = 1;
static void cpuwakeup(struct limine_mp_info *info) {
cpu_set((cpu_t *)info->extra_argument);
current_cpu()->internal_id = __atomic_fetch_add(&next_id, 1, __ATOMIC_SEQ_CST);
arch_gdt_reload();
arch_idt_reload();
interrupt_register(0xfd, (void *)cpuwakeuphalt, NULL, IPL_IGNORE);
@@ -107,17 +103,23 @@ void arch_smp_wakeup(void) {
void (*wakeupfn)(struct limine_mp_info *) = GET_KERNEL_ARGUMENT(nosmp, bool) ? cpuwakeuphalt : cpuwakeup;
// make the other processors jump to cpuwakeup()
get_bsp()->internal_id = 0;
smp_cpus[0] = get_bsp();
long next_id = 1;
for (int i = 0; i < response->cpu_count; ++i) {
// skip the bootstrap processor
if (response->cpus[i]->lapic_id == response->bsp_lapic_id) {
smp_cpus[i] = get_bsp();
if (response->cpus[i]->lapic_id == response->bsp_lapic_id)
continue;
}
cpu_t *cpu = (cpu_t *)((uintptr_t)cpus + cpu_stride * i);
smp_cpus[i] = cpu;
cpu->internal_id = next_id;
smp_cpus[next_id++] = cpu;
response->cpus[i]->extra_argument = (uint64_t)cpu;
}
for (int i = 0; i < response->cpu_count; ++i) {
if (response->cpus[i]->lapic_id == response->bsp_lapic_id)
continue;
__atomic_store_n(&response->cpus[i]->goto_address, wakeupfn, __ATOMIC_SEQ_CST);
}