Added VGA print SR

4 years ago · 72ea40c23e
parent 1a236b47a4
commit 72ea40c23e
3 changed files with 29 additions and 0 deletions
--- a/src/equ/VGA.asm
+++ b/src/equ/VGA.asm
@ -0,0 +1,4 @@
+; VGA EQUs
+
+VIDEO_MEM equ 0xb8000
+
--- a/src/equ/vga.asm
+++ b/src/equ/vga.asm
--- a/src/vga/print.asm
+++ b/src/vga/print.asm
@ -0,0 +1,25 @@
+[bits 32]
+
+; VGA base address: 0xb8000
+; Charpos = 0xb8000 + 2 * (row * 80 + col)
+
+vga_print:
+	pusha
+	mov edx, VIDEO_MEM
+
+	vga_print_loop:
+		mov al, [ebx]
+		mov ah, 0x0f
+
+		cmp al, ASCII_END
+		je vga_print_return
+
+		mov [edx], ax
+		inc ebx
+		add edx, 2
+
+		jmp vga_print_loop
+	
+	vga_print_return:
+		popa
+		ret