Add print routine

1 files changed, 27 insertions, 0 deletions

diff --git a/bootloader/printIntBios.asm b/bootloader/printIntBios.asm
new file mode 100644
index 0000000..2a6c735
--- /dev/null
+++ b/bootloader/printIntBios.asm
@@ -0,0 +1,27 @@
+printIntBios:
+
+	;Save registers
+	push ax
+	push bx
+
+	;Print loop
+	.loop:
+
+		mov ah, 0x0E	;Use 0xE bios service for teletype print
+		lodsb		;Load char in al and inc SI register
+		cmp al, 0x0	;Check if we print all the chain
+		je .end		;If yes go to end
+
+		mov bl, 0x0F	;Else set color register
+
+		int 0x10	;And print the character
+
+		jmp .loop	;Go to the next character
+	.end:
+
+	;Restore registers
+	pop bx
+	pop ax
+
+	;Back to previous task
+	ret