/* SPDX-License-Identifier: GPL-2.0-only */
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.text
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#include <linux/linkage.h>
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#include <asm/segment.h>
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#include <asm/page_types.h>
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# Copyright 2003, 2008 Pavel Machek <pavel@suse.cz
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.code32
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ALIGN
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SYM_CODE_START(wakeup_pmode_return)
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movw $__KERNEL_DS, %ax
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movw %ax, %ss
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movw %ax, %fs
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movw %ax, %gs
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movw $__USER_DS, %ax
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movw %ax, %ds
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movw %ax, %es
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# reload the gdt, as we need the full 32 bit address
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lidt saved_idt
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lldt saved_ldt
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ljmp $(__KERNEL_CS), $1f
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1:
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movl %cr3, %eax
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movl %eax, %cr3
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wbinvd
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# and restore the stack ... but you need gdt for this to work
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movl saved_context_esp, %esp
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movl %cs:saved_magic, %eax
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cmpl $0x12345678, %eax
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jne bogus_magic
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# jump to place where we left off
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movl saved_eip, %eax
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jmp *%eax
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SYM_CODE_END(wakeup_pmode_return)
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bogus_magic:
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jmp bogus_magic
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save_registers:
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sidt saved_idt
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sldt saved_ldt
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str saved_tss
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leal 4(%esp), %eax
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movl %eax, saved_context_esp
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movl %ebx, saved_context_ebx
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movl %ebp, saved_context_ebp
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movl %esi, saved_context_esi
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movl %edi, saved_context_edi
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pushfl
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popl saved_context_eflags
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movl $ret_point, saved_eip
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RET
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restore_registers:
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movl saved_context_ebp, %ebp
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movl saved_context_ebx, %ebx
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movl saved_context_esi, %esi
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movl saved_context_edi, %edi
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pushl saved_context_eflags
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popfl
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RET
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SYM_CODE_START(do_suspend_lowlevel)
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call save_processor_state
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call save_registers
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pushl $3
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call x86_acpi_enter_sleep_state
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addl $4, %esp
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# In case of S3 failure, we'll emerge here. Jump
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# to ret_point to recover
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jmp ret_point
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.p2align 4,,7
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ret_point:
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call restore_registers
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call restore_processor_state
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RET
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SYM_CODE_END(do_suspend_lowlevel)
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.data
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ALIGN
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SYM_DATA(saved_magic, .long 0)
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saved_eip: .long 0
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# saved registers
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saved_idt: .long 0,0
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saved_ldt: .long 0
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saved_tss: .long 0
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