| 1 | section .data |
| 2 | |
| 3 | align 16 |
| 4 | linux_gdt: |
| 5 | dq 0 |
| 6 | |
| 7 | dq 0 |
| 8 | |
| 9 | dw 0xffff |
| 10 | dw 0x0000 |
| 11 | db 0x00 |
| 12 | db 10011011b |
| 13 | db 11001111b |
| 14 | db 0x00 |
| 15 | |
| 16 | dw 0xffff |
| 17 | dw 0x0000 |
| 18 | db 0x00 |
| 19 | db 10010011b |
| 20 | db 11001111b |
| 21 | db 0x00 |
| 22 | |
| 23 | .end: |
| 24 | |
| 25 | align 16 |
| 26 | linux_gdt_ptr: |
| 27 | dw (linux_gdt.end - linux_gdt) - 1 |
| 28 | dd 0 |
| 29 | |
| 30 | bits 32 |
| 31 | |
| 32 | section .text |
| 33 | |
| 34 | global linux_spinup |
| 35 | linux_spinup: |
| 36 | call .p0 |
| 37 | .p0: |
| 38 | pop eax |
| 39 | lea ebx, [eax - (linux_spinup.p0 - linux_gdt_ptr)] |
| 40 | lea ecx, [eax - (linux_spinup.p0 - linux_gdt)] |
| 41 | mov [ebx+2], ecx |
| 42 | |
| 43 | lgdt [ebx] |
| 44 | |
| 45 | push 0x10 |
| 46 | call .p1 |
| 47 | .p1: |
| 48 | add dword [esp], .fj - .p1 |
| 49 | retfd |
| 50 | |
| 51 | .fj: |
| 52 | mov eax, 0x18 |
| 53 | mov ds, eax |
| 54 | mov es, eax |
| 55 | mov fs, eax |
| 56 | mov gs, eax |
| 57 | mov ss, eax |
| 58 | |
| 59 | xor ebp, ebp |
| 60 | xor edi, edi |
| 61 | xor ebx, ebx |
| 62 | |
| 63 | mov esi, [esp+8] ; boot_params |
| 64 | |
| 65 | cld |
| 66 | |
| 67 | jmp [esp+4] |
| 68 | |
| 69 | section .note.GNU-stack noalloc noexec nowrite progbits |
