Refactored into multiple files

handler.nasm

@@ -0,0 +1,130 @@
+extern unhandled_handler
+unhandled_handler:
+mov ax, 0x10
+mov ds, ax
+mov dword [0xb8000], 0x0f000f00 | 'E' | 'R' << 16
+mov dword [0xb8004], 0x0f000f00 | 'R' | 'O' << 16
+mov dword [0xb8008], 0x0f000f00 | 'R' | '!' << 16
+.hlt:
+hlt
+jmp .hlt
+
+extern gpf_handler_v86
+global gpfHandler
+gpfHandler:
+iret
+mov ax, 0x10
+mov ds, ax
+;jmp gpf_handler_v86
+mov word [0xb8000], 0x0f00 | 'G'
+mov word [0xb8002], 0x0f00 | 'P'
+mov word [0xb8004], 0x0f00 | 'F'
+.hlt:
+hlt
+jmp .hlt
+
+scancodesToAscii: db 0, 0 ; 0x00 - 0x01
+db "1234567890" ; 0x02 - 0x0B
+db "-=" ; 0x0C - 0x0D
+db 0, 0 ; 0x0E - 0x0F
+db "qwertyuiop[]" ; 0x10 - 0x1B
+db 0, 0 ; 0x1C - 0x1D
+db "asdfghjkl;'`" ; 0x1E - 0x29
+db 0 ; 0x2A
+db "\zxcvbnm,./" ; 0x2B - 0x35
+db 0 ; 0x36
+db '*' ; 0x37
+db 0 ; 0x38
+db ' ' ; 0x39
+db 'C'
+scancodesToAsciiEnd:
+cursorCurrent: dd 0xb8000 + (80*6*2)
+global keyboardHandler
+keyboardHandler:
+push eax
+push ebx
+push ds
+mov ax, 0x10
+mov ds, ax
+xor eax, eax
+in al, 0x60
+cmp eax, 0x3A
+jg .done
+mov al, [scancodesToAscii+eax]
+test al, al
+jz .done
+mov ebx, [cursorCurrent]
+mov byte [ebx], al
+add dword [cursorCurrent], 2
+mov byte [KBDWAIT], 1
+.done:
+mov al, 0x20
+out 0x20, al
+pop ds
+pop ebx
+pop eax
+iret
+
+KBDWAIT: db 0
+global kbd_wait
+kbd_wait:
+mov byte [KBDWAIT], 0
+.loop:
+hlt
+xor eax, eax
+mov al, [KBDWAIT]
+test eax, eax
+jz .loop
+ret
+
+global timerHandler
+timerHandler:
+push eax
+push ds
+mov ax, 0x10
+mov ds, ax
+inc byte [(0xb8000 + (80*8*2))]
+mov al, 0x20
+out 0x20, al
+pop ds
+pop eax
+iret
+
+global picInit
+picInit:
+mov al, 0x11  ; initialization sequence
+out 0x20, al  ; send to 8259A-1
+jmp $+2
+jmp $+2
+out 0xA0, al  ; and to 8259A-2
+jmp $+2
+jmp $+2
+mov al, 0x20  ; start of hardware ints (0x20)
+out 0x21, al
+jmp $+2
+jmp $+2
+mov al, 0x28  ; start of hardware ints 2 (0x28)
+out 0xA1, al
+jmp $+2
+jmp $+2
+mov al, 0x04  ; 8259-1 is master
+out 0x21, al
+jmp $+2
+jmp $+2
+mov al, 0x02  ; 8259-2 is slave
+out 0xA1, al
+jmp $+2
+jmp $+2
+mov al, 0x01  ; 8086 mode for both
+out 0x21, al
+jmp $+2
+jmp $+2
+out 0xA1, al
+jmp $+2
+jmp $+2
+mov al, 0xFF  ; all interrupts off for now
+out 0x21, al
+jmp $+2
+jmp $+2
+out 0xA1, al
+ret