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/*
* Copyright (C) 2009 Juergen Beisert, Pengutronix
*
* 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; either version 2 of
* the License, or (at your option) any later version.
*
* 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., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
/**
* @file
* @brief Definition of the Global Descriptor Table
*/
#include <types.h>
#include <asm/modes.h>
#include <asm/segment.h>
/**
* The 'Global Descriptor Table' used in barebox
*
* Note: This table must reachable by real and flat mode code
*/
uint64_t gdt[] __attribute__((aligned(16))) __bootdata = {
/* CS: code, read/execute, 4 GB, base 0 */
[GDT_ENTRY_BOOT_CS] = GDT_ENTRY(0xc09b, 0, 0xfffff),
/* DS: data, read/write, 4 GB, base 0 */
[GDT_ENTRY_BOOT_DS] = GDT_ENTRY(0xc093, 0, 0xfffff),
/* CS: for real mode calls */
[GDT_ENTRY_REAL_CS] = GDT_ENTRY(0x009E, 0, 0x0ffff),
/* DS: for real mode calls */
[GDT_ENTRY_REAL_DS] = GDT_ENTRY(0x0092, 0, 0x0ffff),
/* TSS: 32-bit tss, 104 bytes, base 4096 */
/* We only have a TSS here to keep Intel VT happy;
we don't actually use it for anything. */
[GDT_ENTRY_BOOT_TSS] = GDT_ENTRY(0x0089, 4096, 103),
};
/**
* Size of the GDT must be known to load it
*
* Note: This varibale must reachable by real and flat mode code
*/
unsigned gdt_size __bootdata = sizeof(gdt);
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