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107 líneas
2.7 KiB
107 líneas
2.7 KiB
BITS 16
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;mov si, test_string
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lfsf_systemcall:
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mov ax, 0
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mov ah, 0x10
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int 0x16
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mov ah, 0x0e
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mov al, 65 ; backspace
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int 0x10 ; print char
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ret
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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print:
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; Prints string in si
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; IN si: zero terminated string to print
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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mov ah, 0xE ; Specify 'int 0x10' 'teletype output' function
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; [AL = Character, BH = Page Number, BL = Colour (in graphics mode)]
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.printchar:
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lodsb ; Load byte at address SI into AL, and increment SI
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test al, al
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jz .done ; If the character is zero (NUL), stop writing the string
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int 0x10 ; Otherwise, print the character via 'int 0x10'
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jmp .printchar ; Repeat for the next character
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.done:
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ret
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printCRLF:
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mov ah, 0xE
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mov al, 13
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int 0x10
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mov al, 10
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int 0x10
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ret
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printSpace:
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mov ax, 0xE20
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int 0x10
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ret
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printALChar:
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mov ah, 0xE
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mov bl, 0x02 ;color
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int 0x10
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ret
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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print_reverse:
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; Prints string in si
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; IN bx: adress of string
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; IN cx: length
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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mov ah, 0xE ; Specify 'int 0x10' 'teletype output' function
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; [AL = Character, BH = Page Number, BL = Colour (in graphics mode)]
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add bx, cx
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.printchar:
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mov BYTE al, [bx] ; Load byte at address SI into AL, and increment SI
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test al, al
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jz .done ; If the character is zero (NUL), stop writing the string
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cmp cx, 0
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jz .done
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int 0x10 ; Otherwise, print the character via 'int 0x10'
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dec bx
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dec cx
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jmp .printchar ; Repeat for the next character
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.done:
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ret
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; Changing the screen the user i looking at.
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; value in 'al' is the screen we want to switch to.
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; starting from 0x00
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os_change_screen:
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; Here the addresses for the screens stack
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; and base pointer has to be set.
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mov ah, 0x05
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int 0x10
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ret
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os_clear_screen:
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pusha
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; move cursor to the bootom
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xor ax, ax
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xor bx, bx
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mov ah, 0x02
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mov bh, 0x00 ; page number 0
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mov dh, 0x18 ; row zero
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mov dl, 0x00 ; coloumn zero
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int 0x10
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xor cx, cx
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.loop:
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call printCRLF
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add cx, 1
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cmp cx, 0x19 ; until blank screen
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jne .loop
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; Move curser back to the top of the screen
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mov ah, 0x02
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mov bh, 0x00 ; page number 0
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mov dh, 0x00 ; row zero
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mov dl, 0x00 ; coloumn zero
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int 0x10
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popa
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ret
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test_string db "Hello", 13, 0
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times 2048-($-$$) db 0
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