162 lines
2.7 KiB
NASM
162 lines
2.7 KiB
NASM
extern unhandled_handler
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unhandled_handler:
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mov ax, 0x10
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mov ds, ax
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mov dword [0xb8000], 0x0f000f00 | 'E' | 'R' << 16
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mov dword [0xb8004], 0x0f000f00 | 'R' | 'O' << 16
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mov dword [0xb8008], 0x0f000f00 | 'R' | '!' << 16
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.hlt:
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hlt
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jmp .hlt
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global pageFaultHandler
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pageFaultHandler:
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mov ax, 0x10
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mov ds, ax
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pop eax ; error code
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mov ebx, 0x0f000f00 | '0' | '!' << 16
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and eax, 0x7 ; U/S,R/W,P
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add ebx, eax
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mov dword [0xb8000], 0x0f000f00 | 'P' | 'G' << 16
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mov dword [0xb8004], 0x0f000f00 | 'F' | 'L' << 16
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mov dword [0xb8008], 0x0f000f00 | 'T' | ':' << 16
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mov dword [0xb800C], ebx
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.hlt:
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hlt
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jmp .hlt
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extern gpf_handler_v86
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global gpfHandler
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gpfHandler:
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push eax
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mov ax, 0x10
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mov ds, ax
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mov eax, dword [esp+16] ; EFLAGS
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and eax, 1 << 17 ; VM flag
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test eax, eax
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pop eax
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jnz gpf_handler_v86
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jmp gpf_handler_32
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gpf_unhandled:
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mov dword [0xb8000], 0x0f000f00 | 'G' | 'P' << 16
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mov dword [0xb8004], 0x0f000f00 | 'F' | '!' << 16
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.hlt:
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hlt
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jmp .hlt
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gpf_handler_32:
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push eax
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mov eax, dword [esp+8] ; EIP
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movzx eax, word [eax]
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cmp eax, 0x30CD ; int 0x30
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jne gpf_unhandled
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pop eax ; return value
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jmp return_prev_task
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extern return_prev_task
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scancodesToAscii: db 0, 0 ; 0x00 - 0x01
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db "1234567890" ; 0x02 - 0x0B
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db "-=" ; 0x0C - 0x0D
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db 0, 0 ; 0x0E - 0x0F
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db "qwertyuiop[]" ; 0x10 - 0x1B
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db 0, 0 ; 0x1C - 0x1D
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db "asdfghjkl;'`" ; 0x1E - 0x29
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db 0 ; 0x2A
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db "\zxcvbnm,./" ; 0x2B - 0x35
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db 0 ; 0x36
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db '*' ; 0x37
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db 0 ; 0x38
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db ' ' ; 0x39
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db 'C'
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scancodesToAsciiEnd:
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cursorCurrent: dd 0xb8000 + (80*6*2)
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global keyboardHandler
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keyboardHandler:
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push eax
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push ebx
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push ds
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mov ax, 0x10
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mov ds, ax
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xor eax, eax
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in al, 0x60
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cmp eax, 0x3A
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jg .done
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mov al, [scancodesToAscii+eax]
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test al, al
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jz .done
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mov ebx, [cursorCurrent]
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mov byte [ebx], al
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add dword [cursorCurrent], 2
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mov byte [KBDWAIT], 1
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.done:
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mov al, 0x20
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out 0x20, al
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pop ds
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pop ebx
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pop eax
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iret
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KBDWAIT: db 0
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global kbd_wait
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kbd_wait:
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mov byte [KBDWAIT], 0
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.loop:
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hlt
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movzx eax, byte [KBDWAIT]
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test eax, eax
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jz .loop
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ret
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global timerHandler
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timerHandler:
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push eax
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push ds
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mov ax, 0x10
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mov ds, ax
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inc byte [(0xb8000 + (80*8*2))]
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mov al, 0x20
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out 0x20, al
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pop ds
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pop eax
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iret
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global picInit
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picInit:
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mov al, 0x11 ; initialization sequence
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out 0x20, al ; send to 8259A-1
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jmp $+2
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jmp $+2
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out 0xA0, al ; and to 8259A-2
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jmp $+2
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jmp $+2
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mov al, 0x20 ; start of hardware ints (0x20)
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out 0x21, al
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jmp $+2
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jmp $+2
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mov al, 0x28 ; start of hardware ints 2 (0x28)
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out 0xA1, al
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jmp $+2
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jmp $+2
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mov al, 0x04 ; 8259-1 is master
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out 0x21, al
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jmp $+2
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jmp $+2
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mov al, 0x02 ; 8259-2 is slave
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out 0xA1, al
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jmp $+2
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jmp $+2
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mov al, 0x01 ; 8086 mode for both
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out 0x21, al
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jmp $+2
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jmp $+2
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out 0xA1, al
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jmp $+2
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jmp $+2
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mov al, 0xFF ; all interrupts off for now
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out 0x21, al
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jmp $+2
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jmp $+2
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out 0xA1, al
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ret
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