71 lines
2.1 KiB
NASM
71 lines
2.1 KiB
NASM
[BITS 32]
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[ORG 0x400000]
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global user_test
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user_test:
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mov dword [0xb8000], 0x0f000f00 | 'U' | 's' << 16
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mov dword [0xb8004], 0x0f000f00 | 'e' | 'r' << 16
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mov dword [0xb8008], 0x0f000f00 | 'm' | 'o' << 16
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mov dword [0xb800C], 0x0f000f00 | 'd' | 'e' << 16
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mov dword [0xb8010], 0x0f000f00 | '!'
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mov dword [0xb8000+160], 0x0f000f00 | 'F' | 'a' << 16
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mov dword [0xb8004+160], 0x0f000f00 | 'u' | 'l' << 16
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mov dword [0xb8008+160], 0x0f000f00 | 't' | 's' << 16
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mov dword [0xb800C+160], 0x0f000f00 | ':' | ' ' << 16
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mov dword [0xb8000+320], 0x0f000f00 | 'd' | ':' << 16
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mov dword [0xb8004+320], 0x0f000f00 | ' ' | '#' << 16
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mov dword [0xb8008+320], 0x0f000f00 | 'D' | 'I' << 16
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mov dword [0xb800C+320], 0x0f000f00 | 'V' | ' ' << 16
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mov dword [0xb8000+480], 0x0f000f00 | 'p' | ':' << 16
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mov dword [0xb8004+480], 0x0f000f00 | ' ' | 'P' << 16
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mov dword [0xb8008+480], 0x0f000f00 | 'G' | 'F' << 16
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mov dword [0xb800C+480], 0x0f000f00 | 'L' | 'T' << 16
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mov dword [0xb8000+640], 0x0f000f00 | 'u' | ':' << 16
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mov dword [0xb8004+640], 0x0f000f00 | ' ' | '#' << 16
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mov dword [0xb8008+640], 0x0f000f00 | 'U' | 'D' << 16
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mov dword [0xb800C+640], 0x0f000f00 | '2' | ' ' << 16
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mov dword [0xb8000+800], 0x0f000f00 | 'g' | ':' << 16
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mov dword [0xb8004+800], 0x0f000f00 | ' ' | '#' << 16
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mov dword [0xb8008+800], 0x0f000f00 | 'G' | 'P' << 16
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mov dword [0xb800C+800], 0x0f000f00 | 'F' | ' ' << 16
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mov eax, 0 ; command = 00h, get key
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int 0x21 ; OS call
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cmp al, 'd'
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je .div_err
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cmp al, 'p'
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je .page_err
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cmp al, 'u'
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je .undefined_err
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cmp al, 'g'
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je .gpf_err
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push 0x00000013 ; eax AH=0,AL=3 set video mode 3
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push 0x00000000 ; ecx
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push 0x00000000 ; edx
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push 0x00000000 ; ebx
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push 0x00000000 ; esi
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push 0x00000000 ; edi
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push esp ; regs
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push 0x10 ; interrupt
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mov eax, 0x86 ; command = 86h, virtual 8086 call
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int 0x21 ; OS call
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mov edi, 0xA0000
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xor eax, eax
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.loop:
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mov ecx, 320
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rep stosb
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inc al
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cmp eax, 200
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jl .loop
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mov eax, 0xA0000
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int 0x30 ; Exit
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.page_err:
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mov edx, 0x105000 ; somewhere in kernel mem
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mov edx, [edx] ; should page fault
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.div_err:
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xor ebx, ebx
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div bl ; Unhandled DIV0 exception
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.undefined_err:
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ud2 ; undefined instruction
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.gpf_err:
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mov ax, 0x10
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mov ds, ax ; load ds with bad value
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