| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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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.h> |
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| 6 | #include <asm/pgtable_32.h> |
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| 7 | |
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| 8 | .macro writepost,value |
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| 9 | movb $0x34, %al |
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| 10 | outb %al, $0x70 |
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| 11 | movb $\value, %al |
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| 12 | outb %al, $0x71 |
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| 13 | .endm |
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| 14 | |
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| 15 | wakeup_start: |
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| 16 | # OFW lands us here, running in protected mode, with a |
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| 17 | # kernel-compatible GDT already setup. |
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| 18 | |
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| 19 | # Clear any dangerous flags |
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| 20 | pushl $0 |
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| 21 | popfl |
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| 22 | |
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| 23 | writepost 0x31 |
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| 24 | |
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| 25 | # Set up %cr3 |
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| 26 | movl $initial_page_table - __PAGE_OFFSET, %eax |
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| 27 | movl %eax, %cr3 |
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| 28 | |
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| 29 | movl saved_cr4, %eax |
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| 30 | movl %eax, %cr4 |
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| 31 | |
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| 32 | movl saved_cr0, %eax |
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| 33 | movl %eax, %cr0 |
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| 34 | |
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| 35 | # Control registers were modified, pipeline resync is needed |
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| 36 | jmp 1f |
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| 37 | 1: |
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| 38 | |
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| 39 | movw $__KERNEL_DS, %ax |
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| 40 | movw %ax, %ss |
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| 41 | movw %ax, %ds |
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| 42 | movw %ax, %es |
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| 43 | movw %ax, %fs |
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| 44 | movw %ax, %gs |
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| 45 | |
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| 46 | lgdt saved_gdt |
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| 47 | lidt saved_idt |
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| 48 | lldt saved_ldt |
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| 49 | ljmp $(__KERNEL_CS),$1f |
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| 50 | 1: |
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| 51 | movl %cr3, %eax |
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| 52 | movl %eax, %cr3 |
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| 53 | wbinvd |
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| 54 | |
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| 55 | # Go back to the return point |
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| 56 | jmp ret_point |
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| 57 | |
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| 58 | save_registers: |
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| 59 | sgdt saved_gdt |
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| 60 | sidt saved_idt |
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| 61 | sldt saved_ldt |
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| 62 | |
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| 63 | pushl %edx |
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| 64 | movl %cr4, %edx |
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| 65 | movl %edx, saved_cr4 |
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| 66 | |
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| 67 | movl %cr0, %edx |
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| 68 | movl %edx, saved_cr0 |
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| 69 | |
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| 70 | popl %edx |
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| 71 | |
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| 72 | movl %ebx, saved_context_ebx |
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| 73 | movl %ebp, saved_context_ebp |
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| 74 | movl %esi, saved_context_esi |
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| 75 | movl %edi, saved_context_edi |
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| 76 | |
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| 77 | pushfl |
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| 78 | popl saved_context_eflags |
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| 79 | |
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| 80 | RET |
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| 81 | |
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| 82 | restore_registers: |
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| 83 | movl saved_context_ebp, %ebp |
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| 84 | movl saved_context_ebx, %ebx |
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| 85 | movl saved_context_esi, %esi |
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| 86 | movl saved_context_edi, %edi |
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| 87 | |
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| 88 | pushl saved_context_eflags |
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| 89 | popfl |
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| 90 | |
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| 91 | RET |
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| 92 | |
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| 93 | SYM_CODE_START(do_olpc_suspend_lowlevel) |
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| 94 | call save_processor_state |
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| 95 | call save_registers |
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| 96 | |
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| 97 | # This is the stack context we want to remember |
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| 98 | movl %esp, saved_context_esp |
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| 99 | |
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| 100 | pushl $3 |
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| 101 | call xo1_do_sleep |
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| 102 | |
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| 103 | jmp wakeup_start |
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| 104 | .p2align 4,,7 |
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| 105 | ret_point: |
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| 106 | movl saved_context_esp, %esp |
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| 107 | |
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| 108 | writepost 0x32 |
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| 109 | |
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| 110 | call restore_registers |
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| 111 | call restore_processor_state |
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| 112 | RET |
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| 113 | SYM_CODE_END(do_olpc_suspend_lowlevel) |
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| 114 | |
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| 115 | .data |
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| 116 | saved_gdt: .long 0,0 |
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| 117 | saved_idt: .long 0,0 |
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| 118 | saved_ldt: .long 0 |
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| 119 | saved_cr4: .long 0 |
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| 120 | saved_cr0: .long 0 |
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| 121 | saved_context_esp: .long 0 |
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| 122 | saved_context_edi: .long 0 |
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| 123 | saved_context_esi: .long 0 |
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| 124 | saved_context_ebx: .long 0 |
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| 125 | saved_context_ebp: .long 0 |
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| 126 | saved_context_eflags: .long 0 |
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| 127 | |
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