diff options
Diffstat (limited to 'src/stem/mem/gdt.c')
-rw-r--r-- | src/stem/mem/gdt.c | 36 |
1 files changed, 0 insertions, 36 deletions
diff --git a/src/stem/mem/gdt.c b/src/stem/mem/gdt.c deleted file mode 100644 index 5aaad41..0000000 --- a/src/stem/mem/gdt.c +++ /dev/null @@ -1,36 +0,0 @@ -#include "gdt.h" -#include <stdlib.h> -#include <core/monitor.h> - -extern void gdt_flush(uint32_t); //ASM (idt_.asm) - -#define GDT_ENTRIES 5 - -static struct gdt_entry gdt_entries[GDT_ENTRIES]; -static struct gdt_ptr gdt_ptr; - -static void gdt_setGate(int num, uint32_t base, uint32_t limit, uint8_t access, uint8_t gran) { - gdt_entries[num].base_low = (base & 0xFFFF); - gdt_entries[num].base_middle = (base >> 16) & 0xFF; - gdt_entries[num].base_high = (base >> 24) & 0xFF; - - gdt_entries[num].limit_low = (limit & 0xFFFF); - gdt_entries[num].granularity = (limit >> 16) & 0x0F; - gdt_entries[num].granularity |= gran & 0xF0; - gdt_entries[num].access = access; -} - -void gdt_init() { - gdt_ptr.limit = (sizeof(struct gdt_entry) * GDT_ENTRIES) - 1; - gdt_ptr.base = (uint32_t)&gdt_entries; - - gdt_setGate(0, 0, 0, 0, 0); //Null segment - gdt_setGate(1, 0, 0xFFFFFFFF, 0x9A, 0xCF); //Kernel code segment - gdt_setGate(2, 0, 0xFFFFFFFF, 0x92, 0xCF); //Kernel data segment - gdt_setGate(3, 0, 0xFFFFFFFF, 0xFA, 0xCF); //User code segment - gdt_setGate(4, 0, 0xFFFFFFFF, 0xF2, 0xCF); //User data segment - - gdt_flush((uint32_t)&gdt_ptr); - - monitor_write("GDT ok\n"); -} |