49 lines
881 B
NASM
49 lines
881 B
NASM
PUBLIC _enableUnchainedVGAMode
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PUBLIC _enableTextMode
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DISPLAY_MODE_VGA equ 13h
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DISPLAY_MODE_TEXT equ 03h
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VGA_SEQUENCE_CONTROLLER_INDEX equ 0x3c4
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VGA_SEQUENCE_CONTROLLER_DATA equ 0x3c5h
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VGA_SEQUENCE_CONTROLLER_MEMORY_MODE equ 0x04
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VGA_CRT_CONTROLLER_INDEX equ 0x03d4
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VGA_CRT_CONTROLLER_DATA equ 0x03d5
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VGA_CRT_CONTROLLER_UNDERLINE_LOC equ 0x14
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VGA_CRT_CONTROLLER_MODE_CONTROL equ 0x17
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.386
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.model flat,c
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.CODE
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_enableUnchainedVGAMode:
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mov ax,0x0013;
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int 0x10
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mov dx, VGA_SEQUENCE_CONTROLLER_INDEX
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mov al, VGA_SEQUENCE_CONTROLLER_MEMORY_MODE
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mov ah, 0x06
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out dx, ax
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mov dx, VGA_CRT_CONTROLLER_INDEX
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mov al, VGA_CRT_CONTROLLER_MODE_CONTROL
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mov ah, 0xe3
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out dx, ax
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mov dx, VGA_CRT_CONTROLLER_INDEX
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mov al, VGA_CRT_CONTROLLER_UNDERLINE_LOC
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mov ah, 0x00
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out dx, ax
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ret
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_enableTextMode:
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mov ah,0h
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mov al,DISPLAY_MODE_TEXT
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int 10h
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ret
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end
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