projects / mirror_ubuntu-focal-kernel.git / blame
| Commit | Line | Data |
|---|---|---|
| e44b7b75 PM |
1 | /* |
| 2 | * ACPI wakeup real mode startup stub | |
| 3 | */ | |
| 4 | #include <asm/segment.h> | |
| 5 | #include <asm/msr-index.h> | |
| 6 | #include <asm/page.h> | |
| 7 | #include <asm/pgtable.h> | |
| 8 | ||
| 9 | .code16 | |
| 10 | .section ".header", "a" | |
| 11 | ||
| 12 | /* This should match the structure in wakeup.h */ | |
| 13 | .globl wakeup_header | |
| 14 | wakeup_header: | |
| 15 | video_mode: .short 0 /* Video mode number */ | |
| 16 | pmode_return: .byte 0x66, 0xea /* ljmpl */ | |
| 17 | .long 0 /* offset goes here */ | |
| 18 | .short __KERNEL_CS | |
| 19 | pmode_cr0: .long 0 /* Saved %cr0 */ | |
| 20 | pmode_cr3: .long 0 /* Saved %cr3 */ | |
| 21 | pmode_cr4: .long 0 /* Saved %cr4 */ | |
| 22 | pmode_efer: .quad 0 /* Saved EFER */ | |
| 23 | pmode_gdt: .quad 0 | |
| 24 | realmode_flags: .long 0 | |
| 25 | real_magic: .long 0 | |
| 26 | trampoline_segment: .word 0 | |
| 27 | signature: .long 0x51ee1111 | |
| 28 | ||
| 29 | .text | |
| 30 | .globl _start | |
| 31 | .code16 | |
| 32 | wakeup_code: | |
| 33 | _start: | |
| 34 | cli | |
| 35 | cld | |
| 36 | ||
| 37 | /* Set up segments */ | |
| 38 | movw %cs, %ax | |
| 39 | movw %ax, %ds | |
| 40 | movw %ax, %es | |
| 41 | movw %ax, %ss | |
| 42 | ||
| 43 | movl $wakeup_stack_end, %esp | |
| 44 | ||
| 45 | /* Clear the EFLAGS */ | |
| 46 | pushl $0 | |
| 47 | popfl | |
| 48 | ||
| 49 | /* Check header signature... */ | |
| 50 | movl signature, %eax | |
| 51 | cmpl $0x51ee1111, %eax | |
| 52 | jne bogus_real_magic | |
| 53 | ||
| 54 | /* Check we really have everything... */ | |
| 55 | movl end_signature, %eax | |
| 56 | cmpl $0x65a22c82, %eax | |
| 57 | jne bogus_real_magic | |
| 58 | ||
| 59 | /* Call the C code */ | |
| 60 | calll main | |
| 61 | ||
| 62 | /* Do any other stuff... */ | |
| 63 | ||
| 64 | #ifndef CONFIG_64BIT | |
| 65 | /* This could also be done in C code... */ | |
| 66 | movl pmode_cr3, %eax | |
| 67 | movl %eax, %cr3 | |
| 68 | ||
| 69 | movl pmode_cr4, %ecx | |
| 70 | jecxz 1f | |
| 71 | movl %ecx, %cr4 | |
| 72 | 1: | |
| 73 | movl pmode_efer, %eax | |
| 74 | movl pmode_efer + 4, %edx | |
| 75 | movl %eax, %ecx | |
| 76 | orl %edx, %ecx | |
| 77 | jz 1f | |
| 78 | movl $0xc0000080, %ecx | |
| 79 | wrmsr | |
| 80 | 1: | |
| 81 | ||
| 82 | lgdtl pmode_gdt | |
| 83 | ||
| 84 | /* This really couldn't... */ | |
| 85 | movl pmode_cr0, %eax | |
| 86 | movl %eax, %cr0 | |
| 87 | jmp pmode_return | |
| 88 | #else | |
| 89 | pushw $0 | |
| 90 | pushw trampoline_segment | |
| 91 | pushw $0 | |
| 92 | lret | |
| 93 | #endif | |
| 94 | ||
| 95 | bogus_real_magic: | |
| 96 | 1: | |
| 97 | hlt | |
| 98 | jmp 1b | |
| 99 | ||
| 100 | .data | |
| 101 | .balign 4 | |
| 102 | .globl HEAP, heap_end | |
| 103 | HEAP: | |
| 104 | .long wakeup_heap | |
| 105 | heap_end: | |
| 106 | .long wakeup_stack | |
| 107 | ||
| 108 | .bss | |
| 109 | wakeup_heap: | |
| 110 | .space 2048 | |
| 111 | wakeup_stack: | |
| 112 | .space 2048 | |
| 113 | wakeup_stack_end: |