61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/*
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* This file is part of the coreboot project.
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*
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* Copyright (C) 2008-2009 coresystems GmbH
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <types.h>
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#include <string.h>
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#include <cbmem.h>
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#include <lib.h>
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#include <console/console.h>
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// Global Descriptor Table, defined in c_start.S
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extern char gdt;
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extern char gdt_end;
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/* i386 lgdt argument */
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struct gdtarg {
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u16 limit;
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u32 base;
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} __attribute__((packed));
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// Copy GDT to new location and reload it
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void move_gdt(void)
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{
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void *newgdt;
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u16 num_gdt_bytes = &gdt_end - &gdt;
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struct gdtarg gdtarg;
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newgdt = cbmem_find(CBMEM_ID_GDT);
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if (!newgdt) {
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newgdt = cbmem_add(CBMEM_ID_GDT, ALIGN(num_gdt_bytes, 512));
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if (!newgdt) {
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printk(BIOS_ERR, "Error: Could not relocate GDT.\n");
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return;
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}
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printk(BIOS_DEBUG, "Moving GDT to %p...", newgdt);
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memcpy((void*)newgdt, &gdt, num_gdt_bytes);
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}
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gdtarg.base = (u32)newgdt;
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gdtarg.limit = num_gdt_bytes - 1;
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__asm__ __volatile__ ("lgdt %0\n\t" : : "m" (gdtarg));
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printk(BIOS_DEBUG, "ok\n");
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}
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