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| author | Bin Meng <bmeng.cn@gmail.com> | 2017-04-21 14:24:35 (GMT) |
|---|---|---|
| committer | Bin Meng <bmeng.cn@gmail.com> | 2017-05-17 09:11:46 (GMT) |
| commit | 2b2d666f9caca189e4014f8e23088b0afc360e22 (patch) | |
| tree | 40b5d45e197afc76bf00774b025c5f0e00835928 | |
| parent | 7d0d2efef82dcb88030a960aef09290e6e49f771 (diff) | |
| download | u-boot-2b2d666f9caca189e4014f8e23088b0afc360e22.tar.xz | |
x86: acpi: Add wake up assembly stub
This adds a wake up stub before jumping to OS wake up vector.
Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Tested-by: Stefan Roese <sr@denx.de>
| -rw-r--r-- | arch/x86/cpu/Makefile | 1 | ||||
| -rw-r--r-- | arch/x86/cpu/wakeup.S | 78 | ||||
| -rw-r--r-- | arch/x86/include/asm/acpi_s3.h | 9 |
3 files changed, 88 insertions, 0 deletions
diff --git a/arch/x86/cpu/Makefile b/arch/x86/cpu/Makefile index 92a9023..e1c84ce 100644 --- a/arch/x86/cpu/Makefile +++ b/arch/x86/cpu/Makefile @@ -45,6 +45,7 @@ ifndef CONFIG_$(SPL_)X86_64 obj-$(CONFIG_SMP) += sipi_vector.o endif obj-y += turbo.o +obj-$(CONFIG_HAVE_ACPI_RESUME) += wakeup.o ifeq ($(CONFIG_$(SPL_)X86_64),y) obj-y += x86_64/ diff --git a/arch/x86/cpu/wakeup.S b/arch/x86/cpu/wakeup.S new file mode 100644 index 0000000..066c9b1 --- /dev/null +++ b/arch/x86/cpu/wakeup.S @@ -0,0 +1,78 @@ +/* + * Copyright (C) 2017, Bin Meng <bmeng.cn@gmail.com> + * + * From coreboot src/arch/x86/wakeup.S + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <asm/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 diff --git a/arch/x86/include/asm/acpi_s3.h b/arch/x86/include/asm/acpi_s3.h index 10cedde..a06466c 100644 --- a/arch/x86/include/asm/acpi_s3.h +++ b/arch/x86/include/asm/acpi_s3.h @@ -7,6 +7,8 @@ #ifndef __ASM_ACPI_S3_H__ #define __ASM_ACPI_S3_H__ +#define WAKEUP_BASE 0x600 + /* PM1_STATUS register */ #define WAK_STS (1 << 15) #define PCIEXPWAK_STS (1 << 14) @@ -27,6 +29,11 @@ #define SLP_TYP_S4 6 #define SLP_TYP_S5 7 +#ifndef __ASSEMBLY__ + +extern char __wakeup[]; +extern int __wakeup_size; + enum acpi_sleep_state { ACPI_S0, ACPI_S1, @@ -92,4 +99,6 @@ enum acpi_sleep_state chipset_prev_sleep_state(void); */ void chipset_clear_sleep_state(void); +#endif /* __ASSEMBLY__ */ + #endif /* __ASM_ACPI_S3_H__ */ |