From a35e29c07873db467e0ca670290666f8786dab03 Mon Sep 17 00:00:00 2001 From: Vegard Storheil Eriksen Date: Sat, 26 Dec 2009 21:15:05 +0100 Subject: First steps reading multiboot info. Added GDT. --- kernel/gdt.h | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) create mode 100644 kernel/gdt.h (limited to 'kernel/gdt.h') diff --git a/kernel/gdt.h b/kernel/gdt.h new file mode 100644 index 0000000..e2c5b46 --- /dev/null +++ b/kernel/gdt.h @@ -0,0 +1,28 @@ +#ifndef GDT_H +#define GDT_H + +#include "types.h" + +typedef struct { + uint16_t limit_low; + uint16_t base_low; + uint8_t base_mid; + uint16_t flags; + uint8_t base_high; +} __attribute__((packed)) gdt_entry; + +typedef struct { + uint16_t limit; + gdt_entry* base; +} __attribute__((packed)) gdt_ptr; + +#define gdt_entry_init(b, l, f) { \ + .base_low = (b & 0xffff), \ + .base_mid = (b >> 16 & 0xff), \ + .base_high = (b >> 24 & 0xff), \ + .limit_low = (l & 0xffff), \ + .flags = (f | (l >> 8 & 0x0f00))} + +void gdt_init(); + +#endif -- cgit v1.2.3