| /* |
| * This file is part of the coreboot project. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| .code32 |
| .section ".text._gdt_", "ax", @progbits |
| |
| .globl gdt_init |
| gdt_init: |
| lgdt %cs:gdtptr |
| ret |
| |
| .previous |
| .align 4 |
| .globl gdtptr |
| gdtptr: |
| .word gdt_end - gdt -1 /* compute the table limit */ |
| .long gdt /* we know the offset */ |
| |
| .align 4 |
| gdt: |
| /* selgdt 0, unused */ |
| .word 0x0000, 0x0000 /* dummy */ |
| .byte 0x00, 0x00, 0x00, 0x00 |
| |
| /* selgdt 0x08, flat code segment */ |
| .word 0xffff, 0x0000 |
| .byte 0x00, 0x9b, 0xcf, 0x00 /* G=1 and 0x0f, So we get 4Gbytes |
| for limit */ |
| |
| /* selgdt 0x10,flat data segment */ |
| .word 0xffff, 0x0000 |
| .byte 0x00, 0x93, 0xcf, 0x00 |
| |
| /* selgdt 0x18, flat code segment (64-bit) */ |
| .word 0xffff, 0x0000 |
| .byte 0x00, 0x9b, 0xaf, 0x00 |
| |
| gdt_end: |
