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56 lines
2.1 KiB
NASM
56 lines
2.1 KiB
NASM
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;=----------------------------------------------------------------------------=;
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; GNU GPL OS/K ;
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; ;
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; Authors: spectral` ;
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; NeoX ;
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; ;
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; Desc: Basic realmode terminal functions ;
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; (x86_64 architecture only) ;
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;=----------------------------------------------------------------------------=;
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[BITS 16]
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disable_cursor:
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pushf
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push eax
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push edx
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mov dx, 0x3D4
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mov al, 0xA ; low cursor shape register
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out dx, al
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inc dx
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mov al, 0x20 ; bits 6-7 unused, bit 5 disables the cursor, bits 0-4 control the cursor shape
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out dx, al
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pop edx
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pop eax
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popf
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ret
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get_dimensions:
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push eax
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push ebx
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mov ah, 0x0F
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int 0x10
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mov [VGA_HEIGHT], ah
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mov [VIDEO_MODE], al
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pop ebx
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pop eax
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ret
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PrintB:
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;---------------------------------------------------;
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; Print out a simple string. ;
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; ;
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; Expects: DS:SI = String to print ;
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; ;
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; Returns: None ;
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; ;
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;---------------------------------------------------;
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lodsb ; Load byte from ds:si to al
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or al, al ; If al is empty stop looping
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jz .done ; Done looping and return
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mov ah, 0x0e ; Teletype output
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int 0x10 ; Video interupt
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jmp PrintB ; Loop untill string is null
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.done:
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ret
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