/* * 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include <types.h> #include <string.h> #include <cbmem.h> #include <lib.h> #include <console/console.h> // Global Descriptor Table, defined in c_start.S extern char gdt; extern char gdt_end; /* i386 lgdt argument */ struct gdtarg { u16 limit; u32 base; } __attribute__((packed)); // Copy GDT to new location and reload it void move_gdt(void) { void *newgdt; u16 num_gdt_bytes = &gdt_end - &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 = (u32)newgdt; gdtarg.limit = num_gdt_bytes - 1; __asm__ __volatile__ ("lgdt %0\n\t" : : "m" (gdtarg)); printk(BIOS_DEBUG, "ok\n"); }