| 0,0 → 1,135 |
|---|
| |
| format MS COFF |
| |
| include '../macros.inc' |
| |
| $Revision: 849 $ |
| |
| include "../const.inc" |
| |
| public __start |
| |
| extrn _high_code |
| extrn __os_stack |
| extrn _boot_mbi |
| extrn _sys_pdbr |
| |
| extrn _gdts |
| extrn __edata |
| |
| section '.start' code readable align 16 |
| |
| use32 |
| |
| align 4 |
| |
| mboot: |
| dd 0x1BADB002 |
| dd 0x00010003 |
| dd -(0x1BADB002 + 0x00010003) |
| dd mboot |
| dd 0x100000 |
| dd __edata; - OS_BASE |
| dd LAST_PAGE |
| dd __start |
| |
| align 16 |
| __start: |
| cld |
| |
| mov esp, __os_stack +(0x100000000-OS_BASE) |
| push 0 |
| popf |
| |
| cmp eax, 0x2BADB002 |
| mov ecx, sz_invboot |
| jne .fault |
| |
| bt dword [ebx], 3 |
| mov ecx, sz_nomods |
| jnc .fault |
| |
| bt dword [ebx], 6 |
| mov ecx, sz_nommap |
| jnc .fault |
| |
| mov [_boot_mbi+(0x100000000-OS_BASE)], ebx |
| |
| xor eax, eax |
| cpuid |
| cmp eax, 0 |
| mov ecx, sz_nopse |
| jbe .fault |
| |
| mov eax, 1 |
| cpuid |
| bt edx, 3 |
| mov ecx, sz_nopse |
| jnc .fault |
| |
| ; ENABLE PAGING |
| |
| mov ecx, 32 |
| mov edi, _sys_pdbr+(OS_BASE shr 20)+(0x100000000-OS_BASE) |
| mov eax, PG_LARGE+PG_SW |
| @@: |
| stosd |
| add eax, 4*1024*1024 |
| loop @B |
| |
| mov dword [_sys_pdbr+(0x100000000-OS_BASE)], PG_LARGE+PG_SW |
| mov dword [_sys_pdbr+(0x100000000-OS_BASE)+4], PG_LARGE+PG_SW+4*1024*1024 |
| mov dword [_sys_pdbr+(0x100000000-OS_BASE)+(page_tabs shr 20)], _sys_pdbr+PG_SW+(0x100000000-OS_BASE) |
| |
| mov ebx, cr4 |
| or ebx, CR4_PSE |
| and ebx, not CR4_PAE |
| mov cr4, ebx |
| |
| mov eax, _sys_pdbr+(0x100000000-OS_BASE) |
| mov ebx, cr0 |
| or ebx,CR0_PG+CR0_WP |
| |
| mov cr3, eax |
| mov cr0, ebx |
| |
| mov ebx, [_boot_mbi+(0x100000000-OS_BASE)] |
| |
| mov edx, [ebx+20] |
| mov esi, [ebx+24] |
| mov ecx, LAST_PAGE |
| test edx, edx |
| jz .no_mods |
| .scan_mod: |
| mov ecx, [esi+4] |
| add esi, 16 |
| dec edx |
| jnz .scan_mod |
| |
| .no_mods: |
| add ecx, 4095 |
| and ecx, not 4095 |
| |
| lgdt [_gdts+(0x100000000-OS_BASE)] |
| jmp pword 0x08:_high_code |
| |
| |
| .fault: |
| ; push ecx |
| ; call _lcls |
| ; call __bprintf |
| _hlt: |
| hlt |
| jmp _hlt |
| |
| sz_invboot db 'Invalid multiboot loader magic value',0x0A |
| db 'Halted',0 |
| |
| sz_nomods db 'No modules loaded',0x0A |
| db 'Halted',0 |
| |
| sz_nommap db 'No memory table', 0x0A |
| db 'Halted',0 |
| |
| sz_nopse db 'Page size extensions not supported',0x0A |
| db 'Halted',0 |