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First Hello world syscall
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This commit is contained in:
Kamil Kowalczyk
2026-01-03 02:04:09 +01:00
parent 1341dc00d9
commit e52268cd8e
26 changed files with 228 additions and 140 deletions
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23
kernel/amd64/smp.c
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@@ -10,6 +10,7 @@
#include <sync/spin_lock.h>
#include <sys/debug.h>
#include <sys/smp.h>
#include <sys/syscall.h>
/// Cpu ID counter
static uint32_t cpu_counter = 0;
@@ -18,6 +19,10 @@ static spin_lock_t cpu_counter_lock = SPIN_LOCK_INIT;
/// The CPUs
static struct cpu cpus[CPUS_MAX];
static bool thiscpu_init = false;
void amd64_thiscpu_set_init (void) { thiscpu_init = true; }
/// Allocate a CPU structure
struct cpu* cpu_make (void) {
spin_lock (&cpu_counter_lock);
@@ -30,30 +35,26 @@ struct cpu* cpu_make (void) {
cpu->lock = SPIN_LOCK_INIT;
cpu->id = id;
return cpu_get (id);
amd64_wrmsr (MSR_SHADOW_GS_BASE, (uint64_t)cpu);
return cpu;
}
struct cpu* cpu_get (uint32_t id) {
if (id >= CPUS_MAX)
struct cpu* cpu_get (void) {
if (!thiscpu_init)
return NULL;
return &cpus[id];
return (struct cpu*)amd64_rdmsr (MSR_SHADOW_GS_BASE);
}
/// Get ID of current running CPU
uint32_t cpu_id (void) { return (uint32_t)amd64_rdmsr (MSR_SHADOW_GS_BASE); }
/// Assign an ID to the current running CPU
void cpu_assign (uint32_t id) { amd64_wrmsr (MSR_SHADOW_GS_BASE, (uint64_t)id); }
/// Bootstrap code for non-BSP CPUs
static void amd64_smp_bootstrap (struct limine_mp_info* mp_info) {
amd64_load_kernel_cr3 ();
struct cpu* cpu = cpu_make ();
cpu_assign (cpu->id);
amd64_init (cpu, true); /* gdt + idt */
syscall_init ();
thiscpu->lapic_ticks = amd64_lapic_init (2500);
amd64_lapic_tick (thiscpu->lapic_ticks);