mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-12-23 11:33:32 +00:00
3cabcf966d
This header relates to ACPI and we are about to add some more ACPI headers. Move this one into a new directory so they are together. The header inclusion in pci_rom.c is not specific to x86 anymore, so drop the #ifdef CONFIG_X86. Signed-off-by: Simon Glass <sjg@chromium.org> Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com> Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
77 lines
1.6 KiB
ArmAsm
77 lines
1.6 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0+ */
|
|
/*
|
|
* Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com>
|
|
*
|
|
* From coreboot src/arch/x86/wakeup.S
|
|
*/
|
|
|
|
#include <acpi/acpi_s3.h>
|
|
#include <asm/processor.h>
|
|
#include <asm/processor-flags.h>
|
|
|
|
#define RELOCATED(x) ((x) - __wakeup + WAKEUP_BASE)
|
|
|
|
#define CODE_SEG (X86_GDT_ENTRY_16BIT_CS * X86_GDT_ENTRY_SIZE)
|
|
#define DATA_SEG (X86_GDT_ENTRY_16BIT_DS * X86_GDT_ENTRY_SIZE)
|
|
|
|
.code32
|
|
.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)
|
|
|
|
/* Activate the right segment descriptor real mode */
|
|
ljmp $CODE_SEG, $RELOCATED(1f)
|
|
1:
|
|
/* 16 bit code from here on... */
|
|
.code16
|
|
|
|
/*
|
|
* Load the segment registers w/ properly configured segment
|
|
* descriptors. They will retain these configurations (limits,
|
|
* writability, etc.) once protected mode is turned off.
|
|
*/
|
|
mov $DATA_SEG, %ax
|
|
mov %ax, %ds
|
|
mov %ax, %es
|
|
mov %ax, %fs
|
|
mov %ax, %gs
|
|
mov %ax, %ss
|
|
|
|
/* Turn off protection */
|
|
movl %cr0, %eax
|
|
andl $~X86_CR0_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 changes the address to be correct.
|
|
*/
|
|
.byte 0xea
|
|
|
|
__wakeup_offset = RELOCATED(.)
|
|
.word 0x0000
|
|
|
|
__wakeup_segment = RELOCATED(.)
|
|
.word 0x0000
|
|
|
|
.globl __wakeup_size
|
|
__wakeup_size:
|
|
.long . - __wakeup
|