diff options
Diffstat (limited to 'src/arch/x86/gdt.c')
| -rw-r--r-- | src/arch/x86/gdt.c | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/arch/x86/gdt.c b/src/arch/x86/gdt.c new file mode 100644 index 0000000000..a21fab24ad --- /dev/null +++ b/src/arch/x86/gdt.c @@ -0,0 +1,62 @@ +/* + * This file is part of the coreboot project. + * + * Copyright (C) 2008-2009 coresystems GmbH + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc. + */ + +#include <types.h> +#include <string.h> +#include <cbmem.h> +#include <console/console.h> +#include <cpu/x86/gdt.h> + +/* i386 lgdt argument */ +struct gdtarg { + u16 limit; +#ifdef __x86_64__ + u64 base; +#else + u32 base; +#endif +} __attribute__((packed)); + +/* Copy GDT to new location and reload it. + * FIXME: We only do this for BSP CPU. + */ +static void move_gdt(int is_recovery) +{ + void *newgdt; + u16 num_gdt_bytes = (uintptr_t)&gdt_end - (uintptr_t)&gdt; + struct gdtarg gdtarg; + + newgdt = cbmem_find(CBMEM_ID_GDT); + if (!newgdt) { + newgdt = cbmem_add(CBMEM_ID_GDT, ALIGN(num_gdt_bytes, 512)); + if (!newgdt) { + printk(BIOS_ERR, "Error: Could not relocate GDT.\n"); + return; + } + printk(BIOS_DEBUG, "Moving GDT to %p...", newgdt); + memcpy((void*)newgdt, &gdt, num_gdt_bytes); + } + + gdtarg.base = (uintptr_t)newgdt; + gdtarg.limit = num_gdt_bytes - 1; + + __asm__ __volatile__ ("lgdt %0\n\t" : : "m" (gdtarg)); + printk(BIOS_DEBUG, "ok\n"); +} +RAMSTAGE_CBMEM_INIT_HOOK(move_gdt) |