137 lines
2.8 KiB
NASM
137 lines
2.8 KiB
NASM
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format MS COFF
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include '../macros.inc'
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$Revision: 849 $
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include "../const.inc"
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public __start
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extrn high_code
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extrn __os_stack
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extrn _boot_mbi
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extrn _sys_pdbr
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extrn _gdts
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extrn __edata
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section '.start' code readable align 16
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use32
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align 4
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mboot:
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dd 0x1BADB002
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dd 0x00010003
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dd -(0x1BADB002 + 0x00010003)
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dd mboot
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dd 0x100000
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dd __edata; - OS_BASE
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dd LAST_PAGE
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dd __start
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align 16
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__start:
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cld
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mov esp, __os_stack +(0x100000000-OS_BASE)
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push 0
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popf
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cmp eax, 0x2BADB002
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mov ecx, sz_invboot
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jne .fault
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bt dword [ebx], 3
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mov ecx, sz_nomods
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jnc .fault
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bt dword [ebx], 6
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mov ecx, sz_nommap
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jnc .fault
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mov [_boot_mbi+(0x100000000-OS_BASE)], ebx
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xor eax, eax
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cpuid
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cmp eax, 0
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mov ecx, sz_nopse
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jbe .fault
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mov eax, 1
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cpuid
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bt edx, 3
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mov ecx, sz_nopse
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jnc .fault
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; ENABLE PAGING
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mov ecx, 64
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mov eax, PG_LARGE+PG_SW
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mov edi, _sys_pdbr+(OS_BASE shr 20)+(0x100000000-OS_BASE)
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mov [edi-4], dword (PG_LARGE+PG_USER)
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@@:
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stosd
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add eax, 4*1024*1024
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loop @B
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mov dword [_sys_pdbr+(0x100000000-OS_BASE)], PG_LARGE+PG_SW
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mov dword [_sys_pdbr+(0x100000000-OS_BASE)+4], PG_LARGE+PG_SW+4*1024*1024
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mov dword [_sys_pdbr+(0x100000000-OS_BASE)+(page_tabs shr 20)], _sys_pdbr+PG_SW+(0x100000000-OS_BASE)
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mov ebx, cr4
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or ebx, CR4_PSE
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and ebx, not CR4_PAE
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mov cr4, ebx
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mov eax, _sys_pdbr+(0x100000000-OS_BASE)
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mov ebx, cr0
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or ebx,CR0_PG+CR0_WP
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mov cr3, eax
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mov cr0, ebx
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mov ebx, [_boot_mbi+(0x100000000-OS_BASE)]
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mov edx, [ebx+20]
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mov esi, [ebx+24]
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mov ecx, LAST_PAGE
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test edx, edx
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jz .no_mods
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.scan_mod:
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mov ecx, [esi+4]
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add esi, 16
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dec edx
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jnz .scan_mod
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.no_mods:
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add ecx, 4095
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and ecx, not 4095
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lgdt [_gdts] ;+(0x100000000-OS_BASE)]
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jmp pword 0x10:high_code
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.fault:
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; push ecx
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; call _lcls
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; call __bprintf
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_hlt:
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hlt
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jmp _hlt
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sz_invboot db 'Invalid multiboot loader magic value',0x0A
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db 'Halted',0
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sz_nomods db 'No modules loaded',0x0A
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db 'Halted',0
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sz_nommap db 'No memory table', 0x0A
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db 'Halted',0
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sz_nopse db 'Page size extensions not supported',0x0A
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db 'Halted',0
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