bios

boot/util.asm

@@ -0,0 +1,34 @@
+%define cr      0x0a
+%define lf      0x0d
+%define endl    0x0
+
+; Reads a character
+; out:
+;   al = asci character
+;   ah = scan code
+read_char:
+    mov ah, 0
+    int 0x16
+    ret
+
+; Prints a character
+; in:
+;   al = asci character to print
+print_char:
+    mov ah, 0x0e
+    int 0x10
+    ret
+
+; Prints a null terminated string
+; in:
+;   si = null terminated string pointer
+print_line:
+    .loop:
+        cmp byte [si], 0
+        je .done
+        mov al, [si]
+        call print_char
+        inc si
+        jmp .loop
+    .done:
+    ret