| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
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| 2 | .text |
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| 3 | #include <linux/linkage.h> |
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| 4 | #include <asm/segment.h> |
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| 5 | #include <asm/page_types.h> |
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| 6 | |
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| 7 | # Copyright 2003, 2008 Pavel Machek <pavel@suse.cz |
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| 8 | |
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| 9 | .code32 |
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| 10 | ALIGN |
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| 11 | |
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| 12 | SYM_CODE_START(wakeup_pmode_return) |
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| 13 | movw $__KERNEL_DS, %ax |
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| 14 | movw %ax, %ss |
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| 15 | movw %ax, %fs |
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| 16 | movw %ax, %gs |
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| 17 | |
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| 18 | movw $__USER_DS, %ax |
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| 19 | movw %ax, %ds |
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| 20 | movw %ax, %es |
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| 21 | |
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| 22 | # reload the gdt, as we need the full 32 bit address |
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| 23 | lidt saved_idt |
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| 24 | lldt saved_ldt |
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| 25 | ljmp $(__KERNEL_CS), $1f |
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| 26 | 1: |
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| 27 | movl %cr3, %eax |
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| 28 | movl %eax, %cr3 |
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| 29 | wbinvd |
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| 30 | |
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| 31 | # and restore the stack ... but you need gdt for this to work |
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| 32 | movl saved_context_esp, %esp |
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| 33 | |
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| 34 | movl %cs:saved_magic, %eax |
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| 35 | cmpl $0x12345678, %eax |
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| 36 | jne bogus_magic |
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| 37 | |
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| 38 | # jump to place where we left off |
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| 39 | movl saved_eip, %eax |
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| 40 | jmp *%eax |
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| 41 | SYM_CODE_END(wakeup_pmode_return) |
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| 42 | |
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| 43 | bogus_magic: |
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| 44 | jmp bogus_magic |
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| 45 | |
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| 46 | |
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| 47 | |
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| 48 | save_registers: |
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| 49 | sidt saved_idt |
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| 50 | sldt saved_ldt |
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| 51 | str saved_tss |
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| 52 | |
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| 53 | leal 4(%esp), %eax |
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| 54 | movl %eax, saved_context_esp |
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| 55 | movl %ebx, saved_context_ebx |
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| 56 | movl %ebp, saved_context_ebp |
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| 57 | movl %esi, saved_context_esi |
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| 58 | movl %edi, saved_context_edi |
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| 59 | pushfl |
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| 60 | popl saved_context_eflags |
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| 61 | |
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| 62 | movl $ret_point, saved_eip |
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| 63 | RET |
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| 64 | |
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| 65 | |
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| 66 | restore_registers: |
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| 67 | movl saved_context_ebp, %ebp |
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| 68 | movl saved_context_ebx, %ebx |
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| 69 | movl saved_context_esi, %esi |
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| 70 | movl saved_context_edi, %edi |
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| 71 | pushl saved_context_eflags |
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| 72 | popfl |
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| 73 | RET |
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| 74 | |
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| 75 | SYM_CODE_START(do_suspend_lowlevel) |
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| 76 | call save_processor_state |
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| 77 | call save_registers |
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| 78 | pushl $3 |
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| 79 | call x86_acpi_enter_sleep_state |
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| 80 | addl $4, %esp |
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| 81 | |
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| 82 | # In case of S3 failure, we'll emerge here. Jump |
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| 83 | # to ret_point to recover |
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| 84 | jmp ret_point |
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| 85 | .p2align 4,,7 |
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| 86 | ret_point: |
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| 87 | call restore_registers |
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| 88 | call restore_processor_state |
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| 89 | RET |
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| 90 | SYM_CODE_END(do_suspend_lowlevel) |
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| 91 | |
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| 92 | .data |
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| 93 | ALIGN |
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| 94 | SYM_DATA(saved_magic, .long 0) |
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| 95 | saved_eip: .long 0 |
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| 96 | |
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| 97 | # saved registers |
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| 98 | saved_idt: .long 0,0 |
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| 99 | saved_ldt: .long 0 |
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| 100 | saved_tss: .long 0 |
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| 101 | |
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| 102 | |
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