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2026-05-07 02:22:25 +03:00
commit 1a9fd27a31
226 changed files with 29188 additions and 0 deletions
@@ -0,0 +1,41 @@
+#include "../../include/gdt/gdt.h"
+#include "../../include/smp/smp.h"
+#include "../../include/io/serial.h"
+#include <string.h>
+#include <stddef.h>
+
+gdt_pointer_t gdtr;
+
+struct {
+    gdt_entry_t gdt_entries[5 + (MAX_CPUS * 2)];
+} __attribute__((packed)) gdt;
+
+tss_t *tss[MAX_CPUS] = {0};
+__attribute__((aligned(16))) char kernel_stacks[MAX_CPUS][KERNEL_STACK_SIZE];
+__attribute__((aligned(16))) char def_ist_stacks[MAX_CPUS][KERNEL_STACK_SIZE];
+__attribute__((aligned(16))) char df_stacks[MAX_CPUS][KERNEL_STACK_SIZE];
+__attribute__((aligned(16))) char nmi_stacks[MAX_CPUS][KERNEL_STACK_SIZE];
+__attribute__((aligned(16))) char pf_stacks[MAX_CPUS][KERNEL_STACK_SIZE];
+
+extern void _load_gdt(gdt_pointer_t *descriptor);
+extern void _reload_segments(uint64_t cs, uint64_t ds);
+
+void gdt_init(void) {
+    memset(&gdt, 0, sizeof(gdt));
+    gdt.gdt_entries[0] = (gdt_entry_t)GDT_ENTRY(0, 0,       0x00, 0x0);
+    gdt.gdt_entries[1] = (gdt_entry_t)GDT_ENTRY(0, 0xFFFFF, 0x9A, 0xA);
+    gdt.gdt_entries[2] = (gdt_entry_t)GDT_ENTRY(0, 0xFFFFF, 0x92, 0xC);
+    gdt.gdt_entries[3] = (gdt_entry_t)GDT_ENTRY(0, 0xFFFFF, 0xF2, 0x8);
+    gdt.gdt_entries[4] = (gdt_entry_t)GDT_ENTRY(0, 0xFFFFF, 0xFA, 0xA);
+    gdtr.size    = (5 * sizeof(gdt_entry_t)) - 1;
+    gdtr.pointer = &gdt.gdt_entries[0];
+
+    serial_printf("Installing temporary GDT for BSP...\n");
+    gdt_load();
+    serial_printf("Temporary GDT installed\n");
+}
+
+void gdt_load(void) {
+    _load_gdt(&gdtr);
+    _reload_segments(GDT_CODE_SEGMENT, GDT_DATA_SEGMENT);
+}