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/* For starting linuxBIOS in protected mode */
#include <arch/rom_segs.h>
/* .section ".rom.text" */
.code32
.align 4
.globl EXT(gdtptr)
gdt:
EXT(gdtptr):
.word gdt_end - gdt -1 /* compute the table limit */
.long gdt /* we know the offset */
.word 0
/* flat code segment */
.word 0xffff, 0x0000
.byte 0x00, 0x9b, 0xcf, 0x00
/* 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 EXT(protected_start)
EXT(protected_start):
lgdt %cs:gdtptr
ljmp $ROM_CODE_SEG, $__protected_start
__protected_start:
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
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