Stefan Reinauer | 3b31402 | 2009-10-26 17:04:28 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * This file is part of the coreboot project. |
| 3 | * |
| 4 | * Copyright (C) 2008-2009 coresystems GmbH |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License as published by |
| 8 | * the Free Software Foundation; version 2 of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | */ |
| 19 | |
| 20 | #include <types.h> |
| 21 | #include <string.h> |
| 22 | #include <cbmem.h> |
| 23 | #include <console/console.h> |
| 24 | |
| 25 | // Global Descriptor Table, defined in c_start.S |
| 26 | extern char gdt; |
| 27 | extern char gdt_end; |
| 28 | |
| 29 | /* i386 lgdt argument */ |
| 30 | struct gdtarg { |
| 31 | u16 limit; |
| 32 | u32 base; |
| 33 | } __attribute__((packed)); |
| 34 | |
| 35 | // Copy GDT to new location and reload it |
| 36 | void move_gdt(void) |
| 37 | { |
| 38 | void *newgdt; |
| 39 | u16 num_gdt_bytes = &gdt_end - &gdt; |
| 40 | struct gdtarg gdtarg; |
| 41 | |
| 42 | newgdt = cbmem_find(CBMEM_ID_GDT); |
| 43 | if (!newgdt) { |
| 44 | newgdt = cbmem_add(CBMEM_ID_GDT, ALIGN(num_gdt_bytes, 512)); |
| 45 | if (!newgdt) { |
| 46 | printk(BIOS_ERR, "Error: Could not relocate GDT.\n"); |
| 47 | return; |
| 48 | } |
| 49 | printk_debug("Moving GDT to %#lx...", newgdt); |
| 50 | memcpy((void*)newgdt, &gdt, num_gdt_bytes); |
| 51 | } |
| 52 | |
| 53 | gdtarg.base = newgdt; |
| 54 | gdtarg.limit = num_gdt_bytes - 1; |
| 55 | |
| 56 | __asm__ __volatile__ ("lgdt %0\n\t" : : "m" (gdtarg)); |
| 57 | printk_debug("ok\n"); |
| 58 | } |
| 59 | |