| 1 | extern _GLOBAL_OFFSET_TABLE_ |
| 2 | |
| 3 | extern gdt |
| 4 | |
| 5 | section .text |
| 6 | |
| 7 | extern flush_irqs |
| 8 | |
| 9 | global common_spinup |
| 10 | bits 32 |
| 11 | common_spinup: |
| 12 | cli |
| 13 | |
| 14 | push 0 |
| 15 | push 0 |
| 16 | lidt [esp] |
| 17 | add esp, 8 |
| 18 | |
| 19 | call .get_got |
| 20 | .get_got: |
| 21 | pop ebx |
| 22 | add ebx, _GLOBAL_OFFSET_TABLE_ + $$ - .get_got wrt ..gotpc |
| 23 | |
| 24 | lgdt [ebx + gdt wrt ..gotoff] |
| 25 | |
| 26 | push dword 0x18 |
| 27 | call .p1 |
| 28 | .p1: |
| 29 | pop eax |
| 30 | add eax, 6 |
| 31 | push eax |
| 32 | retfd |
| 33 | |
| 34 | .flush_cs: |
| 35 | mov eax, 0x20 |
| 36 | mov ds, eax |
| 37 | mov es, eax |
| 38 | mov fs, eax |
| 39 | mov gs, eax |
| 40 | mov ss, eax |
| 41 | |
| 42 | call flush_irqs |
| 43 | |
| 44 | xor eax, eax |
| 45 | lldt ax |
| 46 | |
| 47 | ; We don't need the return address |
| 48 | add esp, 4 |
| 49 | |
| 50 | ; Get function address |
| 51 | pop edi |
| 52 | |
| 53 | ; We don't need the argument count |
| 54 | add esp, 4 |
| 55 | |
| 56 | mov eax, 0x00000011 |
| 57 | mov cr0, eax |
| 58 | |
| 59 | xor eax, eax |
| 60 | mov cr4, eax |
| 61 | mov cr3, eax |
| 62 | |
| 63 | ; Clear TSS busy bit and load TR with base 0, limit 0 |
| 64 | sub esp, 8 |
| 65 | sgdt [esp] |
| 66 | mov eax, [esp + 2] |
| 67 | add esp, 8 |
| 68 | mov byte [eax + 0x3d], 0x89 |
| 69 | mov ax, 0x38 |
| 70 | ltr ax |
| 71 | |
| 72 | call edi |
| 73 | |
| 74 | section .note.GNU-stack noalloc noexec nowrite progbits |
