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/*
* This file is part of the coreboot project.
*
* Copyright (C) 2009 Rudolf Marek <r.marek@assembler.cz>
* Copyright (C) 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.
*/
#define WAKEUP_BASE 0x600
#define RELOCATED(x) (x - __wakeup + WAKEUP_BASE)
/* CR0 bits */
#define PE (1 << 0)
#ifdef __x86_64__
.code64
#else
.code32
#endif
.globl __wakeup
__wakeup:
/* First prepare the jmp to the resume vector */
mov 0x4(%esp), %eax /* vector */
/* last 4 bits of linear addr are taken as offset */
andw $0x0f, %ax
movw %ax, (__wakeup_offset)
mov 0x4(%esp), %eax
/* the rest is taken as segment */
shr $4, %eax
movw %ax, (__wakeup_segment)
/* Then overwrite coreboot with our backed up memory */
cld
movl 8(%esp), %esi
movl 12(%esp), %edi
movl 16(%esp), %ecx
shrl $2, %ecx
rep movsl
/* Activate the right segment descriptor real mode. */
ljmp $0x28, $RELOCATED(1f)
1:
.code16
/* 16 bit code from here on... */
/* Load the segment registers w/ properly configured
* segment descriptors. They will retain these
* configurations (limits, writability, etc.) once
* protected mode is turned off.
*/
mov $0x30, %ax
mov %ax, %ds
mov %ax, %es
mov %ax, %fs
mov %ax, %gs
mov %ax, %ss
/* Turn off protection */
movl %cr0, %eax
andl $~PE, %eax
movl %eax, %cr0
/* Now really going into real mode */
ljmp $0, $RELOCATED(1f)
1:
movw $0x0, %ax
movw %ax, %ds
movw %ax, %es
movw %ax, %ss
movw %ax, %fs
movw %ax, %gs
/* This is a FAR JMP to the OS waking vector. The C code changed
* the address to be correct.
*/
.byte 0xea
__wakeup_offset = RELOCATED(.)
.word 0x0000
__wakeup_segment = RELOCATED(.)
.word 0x0000
.globl __wakeup_size
__wakeup_size:
.long . - __wakeup
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