Elaina Claus
8e05e071e8
files that actually include code should be in .nasm files defines/macros/non-code should be in .inc files
60 lines
2.0 KiB
NASM
60 lines
2.0 KiB
NASM
; Copyright (c) 2024 Elaina Claus
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;
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; Permission is hereby granted, free of charge, to any person obtaining a copy
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; of this software and associated documentation files (the "Software"), to deal
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; in the Software without restriction, including without limitation the rights
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; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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; copies of the Software, and to permit persons to whom the Software is
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; furnished to do so, subject to the following conditions:
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;
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; The above copyright notice and this permission notice shall be included in all
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; copies or substantial portions of the Software.
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;
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; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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; SOFTWARE.
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%ifndef __INC_VIDEO
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; Sets output to 80x25 16 color text mode via BIOS call
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; also clears screen
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; void SetTextMode(void)
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ALIGN 4, db 0x90
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SetTextMode:
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.prolog:
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__CDECL16_ENTRY
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pushf
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.func:
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xor ah, ah ; Set Video mode BIOS function
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mov al, 0x02 ; 16 color 80x25 Text mode
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int 0x10 ; Call video interrupt
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mov ah, 0x05 ; Select active display page BIOS function
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xor al, al ; page 0
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int 0x10 ; call video interrupt
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.endp:
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popf
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__CDECL16_EXIT
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ret
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; disables blinking text mode cursor
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ALIGN 4, db 0x90
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disable_cursor:
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__CDECL16_ENTRY
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.func:
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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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.endp:
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__CDECL16_EXIT
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ret
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%endif
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%define __INC_VIDEO |