blob: 724aed32eb22125d2b61725d3e6294cf7e72d2b3 [file] [log] [blame]
/* For starting linuxBIOS in protected mode */
#include <arch/rom_segs.h>
/* .section ".rom.text" */
.code32
.align 4
.globl gdtptr
/* This is the gdt for ROMCC/ASM part of LinuxBIOS.
* It is different from the gdt in GCC part of LinuxBIOS
* which is defined in c_start.S */
gdt:
gdtptr:
.word gdt_end - gdt -1 /* compute the table limit */
.long gdt /* we know the offset */
.word 0
/* selgdt 0x08, flat code segment */
.word 0xffff, 0x0000
.byte 0x00, 0x9b, 0xcf, 0x00
/* selgdt 0x10,flat data segment */
.word 0xffff, 0x0000
.byte 0x00, 0x93, 0xcf, 0x00
gdt_end:
/*
* When we come here we are in protected mode. We expand
* the stack and copies the data segment from ROM to the
* memory.
*
* After that, we call the chipset bootstrap routine that
* does what is left of the chipset initialization.
*
* NOTE aligned to 4 so that we are sure that the prefetch
* cache will be reloaded.
*/
.align 4
.globl protected_start
protected_start:
lgdt %cs:gdtptr
ljmp $ROM_CODE_SEG, $__protected_start
__protected_start:
/* Save the BIST value */
movl %eax, %ebp
intel_chip_post_macro(0x10) /* post 10 */
movw $ROM_DATA_SEG, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %ss
movw %ax, %fs
movw %ax, %gs
/* Restore the BIST value to %eax */
movl %ebp, %eax