165 lines
2.0 KiB
NASM
165 lines
2.0 KiB
NASM
cpu 8086
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bits 16
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org 0x7c00
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jmp 0:start
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start:
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cld
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cli
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; Set up segments and stack
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mov ax, cs
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mov ds, ax
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mov es, ax
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mov ss, ax
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mov sp, $$
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sti
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initialize_mouse:
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; Initialize mouse
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; https://www.ctyme.com/intr/rb-1601.htm
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mov ax, 0xc205
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mov bh, 3 ; TODO: This is the usual PS/2 mouse packet size, but is it correct here?
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int 0x15
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jc .error
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; Set handler address
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; https://www.ctyme.com/intr/rb-1603.htm
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mov ax, 0xc207
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; es is already set correctly
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mov bx, mouse_handler
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int 0x15
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jc .error
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; Enable mouse
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; https://www.ctyme.com/intr/rb-1596.htm
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mov ax, 0xc200
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mov bh, 1
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int 0x15
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jc .error
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jmp mainloop
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.error:
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; https://www.ctyme.com/intr/rb-1601.htm
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mov ax, 0xc201
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int 0x15
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jmp initialize_mouse
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mainloop:
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; TODO: everything
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hang:
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hlt
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;mov ax, 0x0e00 + '.'
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;int 0x10
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jmp hang
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mouse_handler:
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push ax
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push bx
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push bp
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mov bp, sp
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; status
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mov bx, [bp+16]
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; X negative
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test bl, 0x10
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jz .no_x_negative
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mov ax, 0x0e00 + '-'
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int 0x10
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.no_x_negative:
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; X overflow
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test bl, 0x40
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jz .no_x_overflow
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mov ax, 0x0e00 + 'o'
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.no_x_overflow:
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; X
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mov ax, [bp+14]
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call hexprint8
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mov ax, 0x0e00 + ' '
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int 0x10
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; Y negative
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test bl, 0x20
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jz .no_y_negative
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mov ax, 0x0e00 + '-'
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int 0x10
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.no_y_negative:
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; Y overflow
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test bl, 0x80
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jz .no_y_overflow
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mov ax, 0x0e00 + 'o'
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.no_y_overflow:
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; Y
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mov ax, [bp+12]
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call hexprint8
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mov ax, 0x0e00 + ' '
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int 0x10
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; Left mouse
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test bl, 0x01
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jz .no_lmb
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mov ax, 0x0e00 + 'L'
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int 0x10
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.no_lmb:
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; Right mouse
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test bl, 0x02
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jz .no_rmb
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mov ax, 0x0e00 + 'R'
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int 0x10
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.no_rmb
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mov ax, 0x0e00 + 13
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int 0x10
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mov ax, 0x0e00 + 10
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int 0x10
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pop bp
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pop bx
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pop ax
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retf
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hexprint16:
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xchg ah, al
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call hexprint8
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xchg ah, al
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hexprint8:
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push ax
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push cx
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mov cl, 4
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shr al, cl
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call hexprint4
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pop cx
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pop ax
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hexprint4:
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push ax
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and al, 0xf
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cmp al, 10
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jb .digit09
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add al, 'a' - '0' - 10
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.digit09:
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add al, '0'
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mov ah, 0x0e
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int 0x10
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pop ax
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ret
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times 510-($-$$) db 0
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db 0x55
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db 0xaa
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