| Daniel Drake | 97c4cb7 | 2011-06-25 17:34:11 +0100 | [diff] [blame] | 1 | .text |
| 2 | #include <linux/linkage.h> |
| 3 | #include <asm/segment.h> |
| 4 | #include <asm/page.h> |
| 5 | #include <asm/pgtable_32.h> |
| 6 | |
| 7 | .macro writepost,value |
| 8 | movb $0x34, %al |
| 9 | outb %al, $0x70 |
| 10 | movb $\value, %al |
| 11 | outb %al, $0x71 |
| 12 | .endm |
| 13 | |
| 14 | wakeup_start: |
| 15 | # OFW lands us here, running in protected mode, with a |
| 16 | # kernel-compatible GDT already setup. |
| 17 | |
| 18 | # Clear any dangerous flags |
| 19 | pushl $0 |
| 20 | popfl |
| 21 | |
| 22 | writepost 0x31 |
| 23 | |
| 24 | # Set up %cr3 |
| 25 | movl $initial_page_table - __PAGE_OFFSET, %eax |
| 26 | movl %eax, %cr3 |
| 27 | |
| 28 | movl saved_cr4, %eax |
| 29 | movl %eax, %cr4 |
| 30 | |
| 31 | movl saved_cr0, %eax |
| 32 | movl %eax, %cr0 |
| 33 | |
| 34 | # Control registers were modified, pipeline resync is needed |
| 35 | jmp 1f |
| 36 | 1: |
| 37 | |
| 38 | movw $__KERNEL_DS, %ax |
| 39 | movw %ax, %ss |
| 40 | movw %ax, %ds |
| 41 | movw %ax, %es |
| 42 | movw %ax, %fs |
| 43 | movw %ax, %gs |
| 44 | |
| 45 | lgdt saved_gdt |
| 46 | lidt saved_idt |
| 47 | lldt saved_ldt |
| 48 | ljmp $(__KERNEL_CS),$1f |
| 49 | 1: |
| 50 | movl %cr3, %eax |
| 51 | movl %eax, %cr3 |
| 52 | wbinvd |
| 53 | |
| 54 | # Go back to the return point |
| 55 | jmp ret_point |
| 56 | |
| 57 | save_registers: |
| 58 | sgdt saved_gdt |
| 59 | sidt saved_idt |
| 60 | sldt saved_ldt |
| 61 | |
| 62 | pushl %edx |
| 63 | movl %cr4, %edx |
| 64 | movl %edx, saved_cr4 |
| 65 | |
| 66 | movl %cr0, %edx |
| 67 | movl %edx, saved_cr0 |
| 68 | |
| 69 | popl %edx |
| 70 | |
| 71 | movl %ebx, saved_context_ebx |
| 72 | movl %ebp, saved_context_ebp |
| 73 | movl %esi, saved_context_esi |
| 74 | movl %edi, saved_context_edi |
| 75 | |
| 76 | pushfl |
| 77 | popl saved_context_eflags |
| 78 | |
| 79 | ret |
| 80 | |
| 81 | restore_registers: |
| 82 | movl saved_context_ebp, %ebp |
| 83 | movl saved_context_ebx, %ebx |
| 84 | movl saved_context_esi, %esi |
| 85 | movl saved_context_edi, %edi |
| 86 | |
| 87 | pushl saved_context_eflags |
| 88 | popfl |
| 89 | |
| 90 | ret |
| 91 | |
| 92 | ENTRY(do_olpc_suspend_lowlevel) |
| 93 | call save_processor_state |
| 94 | call save_registers |
| 95 | |
| 96 | # This is the stack context we want to remember |
| 97 | movl %esp, saved_context_esp |
| 98 | |
| 99 | pushl $3 |
| 100 | call xo1_do_sleep |
| 101 | |
| 102 | jmp wakeup_start |
| 103 | .p2align 4,,7 |
| 104 | ret_point: |
| 105 | movl saved_context_esp, %esp |
| 106 | |
| 107 | writepost 0x32 |
| 108 | |
| 109 | call restore_registers |
| 110 | call restore_processor_state |
| 111 | ret |
| 112 | |
| 113 | .data |
| 114 | saved_gdt: .long 0,0 |
| 115 | saved_idt: .long 0,0 |
| 116 | saved_ldt: .long 0 |
| 117 | saved_cr4: .long 0 |
| 118 | saved_cr0: .long 0 |
| 119 | saved_context_esp: .long 0 |
| 120 | saved_context_edi: .long 0 |
| 121 | saved_context_esi: .long 0 |
| 122 | saved_context_ebx: .long 0 |
| 123 | saved_context_ebp: .long 0 |
| 124 | saved_context_eflags: .long 0 |