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add cursor manipulation via bios or crtc

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This commit is contained in:
Elaina Claus
2025-09-05 11:45:20 -04:00
parent d7b29d9113
commit 2e2b4f991d
1 changed files with 22 additions and 4 deletions
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26
include/BIOS/func/video.nasm
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@@ -26,20 +26,20 @@ SetTextMode:
xor ah, ah ; Set Video mode BIOS function xor ah, ah ; Set Video mode BIOS function
mov al, 0x03 ; 16 color 80x25 Text mode mov al, 0x03 ; 16 color 80x25 Text mode
int 0x10 ; Call video interrupt int 0x10 ; Call video interrupt
; TODO: check for carry and clear carry before call
mov ah, 0x05 ; Select active display page BIOS function mov ah, 0x05 ; Select active display page BIOS function
xor al, al ; page 0 xor al, al ; page 0
int 0x10 ; call video interrupt int 0x10 ; call video interrupt
; TODO: check for carry and clear carry before call
.endp: .endp:
popf popf
__CDECL16_EXIT __CDECL16_EXIT
ret ret
; disables blinking text mode cursor ; disables blinking text mode cursor via crtc pokes
; 0x3D4/0x3D5 for color, mono at 0x3B4/0x3B5
ALIGN 4, db 0x90 ALIGN 4, db 0x90
disable_cursor: disable_cursor_crtc:
__CDECL16_ENTRY __CDECL16_ENTRY
.func: .func:
mov dx, 0x3D4 mov dx, 0x3D4
@@ -53,6 +53,24 @@ disable_cursor:
__CDECL16_EXIT __CDECL16_EXIT
ret ret
; disables blinking text mode cursor via BIOS int 10h, ah = 01
ALIGN 4, db 0x90
disable_cursor_bios:
__CDECL16_ENTRY
.func:
push bx
mov ah, 03h ; read cursor pos & shape
xor bh, bh
int 10h ; CH=top scanline, CL=bottom
or ch, 20h ; set bit 5 = disable
mov ah, 01h ; set leaf 01h
int 10h
pop bx
.endp:
__CDECL16_EXIT
ret
; Prints a C-Style string (null terminated) using BIOS vga teletype call ; Prints a C-Style string (null terminated) using BIOS vga teletype call
; void PrintString(char* buf) ; void PrintString(char* buf)
ALIGN 4, db 0x90 ALIGN 4, db 0x90