initialise the APs

src/arch/x86_64/smp.c

@@ -0,0 +1,72 @@
+#include <arch/smp.h>
+#include <limine.h>
+#include <stdio.h>
+#include <arch/panic.h>
+#include <arch/spinlock.h>
+#include <stddef.h>
+#include <arch/cls.h>
+#include <arch/gdt.h>
+#include <arch/idt.h>
+#include <arch/mmu.h>
+#include <arch/apic.h>
+#include <kernel/pmm.h>
+
+cls_t* apcls;
+
+static int lock = 0;
+static size_t cpucount = 1;
+
+static void apstartup(struct limine_smp_info *info){
+	
+	spinlock_acquire(&lock);
+	
+	arch_setcls(&apcls[info->processor_id]);
+	
+	gdt_init();
+
+	idt_init();	
+
+	arch_mmu_apinit();
+	
+	apic_lapicinit();
+
+	printf("CPU %lu ready!\n", info->lapic_id);
+
+	spinlock_release(&lock);
+	
+
+
+	asm("cli;hlt");
+
+}
+
+static volatile struct limine_smp_request smpreq = {
+	.id = LIMINE_SMP_REQUEST,
+	.revision = 0
+};
+
+void smp_init(){
+	
+	struct limine_smp_response *r = smpreq.response;
+
+	if(!r)
+		_panic("Limine did not bring up the other CPUs!", 0);
+
+	cpucount = r->cpu_count;
+	struct limine_smp_info** cpus = r->cpus;
+	
+	apcls = pmm_hhdmalloc(sizeof(cls_t)*cpucount/PAGE_SIZE+1);
+
+	printf("System has %lu CPUs\n", cpucount);
+	
+	for(size_t i = 0; i < cpucount; ++i){
+		if(cpus[i]->lapic_id == r->bsp_lapic_id) continue;
+		printf("Dispatching CPU %lu\n", i);	
+		asm volatile(".intel_syntax noprefix;"
+			"lock xchg rax, [rbx];"
+			".att_syntax prefix;"
+			:
+			: "b"(&cpus[i]->goto_address), "a"(apstartup));
+	}
+
+}