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133 lines
3.0 KiB
C
133 lines
3.0 KiB
C
#include <amd64/apic.h>
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#include <amd64/gdt.h>
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#include <amd64/intr.h>
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#include <amd64/intr_defs.h>
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#include <amd64/mm.h>
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#include <amd64/msr-index.h>
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#include <amd64/msr.h>
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#include <fs/vfs.h>
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#include <libk/std.h>
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#include <libk/string.h>
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#include <limine/requests.h>
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#include <mm/liballoc.h>
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#include <proc/proc.h>
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#include <proc/reschedule.h>
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#include <sync/spin_lock.h>
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#include <sys/debug.h>
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#include <sys/sched.h>
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#include <sys/smp.h>
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#include <sys/syscall.h>
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/// The CPUs
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static struct cpu cpus[CPUS_MAX];
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static atomic_int last_cpu_index = 0;
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static atomic_int cpu_counter;
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static atomic_int cpu_id_counter = 0;
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/// Allocate a CPU structure
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struct cpu* cpu_make (uint64_t lapic_id, uint64_t acpi_id) {
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int id = atomic_fetch_add (&cpu_id_counter, 1);
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struct cpu* cpu = &cpus[id];
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memset (cpu, 0, sizeof (*cpu));
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cpu->lock = SPIN_LOCK_INIT;
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cpu->id = id;
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cpu->acpi_id = acpi_id;
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cpu->lapic_id = lapic_id;
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wrmsr (MSR_GS_BASE, (uint64_t)cpu);
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return cpu;
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}
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struct cpu* cpu_get (void) {
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struct cpu* ptr = (struct cpu*)rdmsr (MSR_GS_BASE);
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return ptr;
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}
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void cpu_request_sched (struct cpu* cpu) {
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if (cpu == thiscpu) {
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proc_sched ();
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return;
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}
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lapic_ipi (cpu->lapic_id, CPU_REQUEST_SCHED);
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}
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struct cpu* cpu_find_lightest (void) {
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struct limine_mp_response* mp = limine_mp_request.response;
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int start = atomic_fetch_add (&last_cpu_index, 1) % mp->cpu_count;
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struct cpu* best_cpu = &cpus[start];
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spin_lock (&best_cpu->lock);
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int best_load = best_cpu->proc_run_q_count;
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spin_unlock (&best_cpu->lock);
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for (int i = 1; i < (int)mp->cpu_count; i++) {
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int idx = (start + i) % mp->cpu_count;
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struct cpu* cpu = &cpus[idx];
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spin_lock (&cpu->lock);
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int l = cpu->proc_run_q_count;
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spin_unlock (&cpu->lock);
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if (l < best_load) {
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best_load = l;
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best_cpu = cpu;
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}
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}
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return best_cpu;
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}
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/// Bootstrap code for non-BSP CPUs
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static void smp_bootstrap (struct limine_mp_info* mp_info) {
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load_kernel_cr3 ();
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struct cpu* cpu = cpu_make (mp_info->lapic_id, mp_info->processor_id);
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gdt_init (cpu);
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idt_load ();
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syscall_init ();
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lapic_init (1000);
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DEBUG ("CPU %u is online!\n", thiscpu->id);
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atomic_fetch_sub (&cpu_counter, 1);
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struct reschedule_ctx rctx = {.cpu = NULL, .reschedule = false};
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struct proc* spin_proc = proc_from_file (VFS_KERNEL, "RD", "/spin", &rctx);
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proc_register (spin_proc, thiscpu, NULL);
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spin_lock (&spin_proc->cpu->lock);
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do_sched (spin_proc, &spin_proc->cpu->lock);
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}
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/// Initialize SMP subsystem for AMD64. Start AP CPUs
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void smp_init (void) {
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lapic_init (1000);
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struct limine_mp_response* mp = limine_mp_request.response;
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cpu_counter = mp->cpu_count - 1;
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for (size_t i = 0; i < mp->cpu_count; i++) {
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if (mp->cpus[i]->processor_id != thiscpu->acpi_id) {
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mp->cpus[i]->goto_address = &smp_bootstrap;
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}
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}
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DEBUG ("Waiting for other CPUs:\n");
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while (atomic_load (&cpu_counter) > 0)
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debugprintf (".\n");
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DEBUG ("All CPUs are up!\n");
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}
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