78 lines
No EOL
1.7 KiB
NASM
78 lines
No EOL
1.7 KiB
NASM
;Copyright 2019 Benji Dial
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;Permission to use, copy, modify, and/or distribute this
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;software for any purpose with or without fee is hereby
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;granted, provided that the above copyright notice and this
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;permission notice appear in all copies.
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;THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS
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;ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
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;IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO
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;EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
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;INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
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;RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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;ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
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;ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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;OF THIS SOFTWARE.
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extern main
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section .mb_header
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dd 0xe852_50d6;magic
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dd 0x0000_0000;architecture - i386
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dd mb_end - $$;length
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dd 0x17adaf2a - mb_end + $$;check
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;tags
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dw 0x0001;info request
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dw 0x0000;flags
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dd mb_end - $$ - 16
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dd 5;boot device
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dd 6;memory map
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mb_end:
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section .text
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bits 32
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global _start
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_start:
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mov dword [info_pointer], ebx
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mov esp, stack
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call main
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mov edx, eax
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mov eax, 0x4720_4720
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mov ebx, 0x000b_8000
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mov ecx, 0x000b_8fa0
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clear_screen_loop:
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mov dword [ebx], eax
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add ebx, 4
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test ebx, ecx
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jne clear_screen_loop
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mov dword [0x000b_8000], 0x4772_4745
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mov dword [0x000b_8004], 0x476f_4772
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mov dword [0x000b_8008], 0x4720_4772
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mov ebx, 0x000b_8020
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mov ecx, 0x000b_800a
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error_number_loop:
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mov al, dl
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and al, 0x07
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or al, 0x30
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mov byte [ebx], al
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sub ebx, 2
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shr edx, 3
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test ebx, ecx
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jne error_number_loop
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cli
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halt:
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hlt
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jmp halt
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section .bss
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global info_pointer
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info_pointer resd 1
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resb 0x1000 - $ + $$
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stack: |