renamed files to show code vs defs

files that actually include code should be in .nasm files
defines/macros/non-code should be in .inc files

include/BIOS/func/video.nasm

@@ -0,0 +1,60 @@
+; Copyright (c) 2024 Elaina Claus
+;
+; Permission is hereby granted, free of charge, to any person obtaining a copy
+; of this software and associated documentation files (the "Software"), to deal
+; in the Software without restriction, including without limitation the rights
+; to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+; copies of the Software, and to permit persons to whom the Software is
+; furnished to do so, subject to the following conditions:
+;
+; The above copyright notice and this permission notice shall be included in all
+; copies or substantial portions of the Software.
+;
+; THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+; IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+; FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+; AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+; LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+; OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+; SOFTWARE.
+
+%ifndef __INC_VIDEO
+; Sets output to 80x25 16 color text mode via BIOS call
+; also clears screen
+; void SetTextMode(void)
+ALIGN 4, db 0x90
+SetTextMode:
+.prolog:
+    __CDECL16_ENTRY
+    pushf
+.func:
+    xor ah, ah                  ; Set Video mode BIOS function
+    mov al, 0x02                ; 16 color 80x25 Text mode
+    int 0x10                    ; Call video interrupt
+
+    mov ah, 0x05                ; Select active display page BIOS function
+    xor al, al                  ; page 0
+    int 0x10                    ; call video interrupt
+.endp:
+    popf
+    __CDECL16_EXIT
+    ret
+
+; disables blinking text mode cursor
+ALIGN 4, db 0x90
+disable_cursor:
+    __CDECL16_ENTRY
+.func:
+    mov dx, 0x3D4
+	mov al, 0xA	    ; low cursor shape register
+	out dx, al
+ 
+	inc dx
+	mov al, 0x20	; bits 6-7 unused, bit 5 disables the cursor, bits 0-4 control the cursor shape
+	out dx, al
+.endp:
+    __CDECL16_EXIT
+    ret
+    
+%endif
+%define __INC_VIDEO