include 16-bit number printing functions in stage1

1 files changed, 47 insertions, 0 deletions

diff --git a/stage1/print.asm b/stage1/print.asm
index 3505eb6..5c4b399 100644
--- a/stage1/print.asm
+++ b/stage1/print.asm
@@ -10,3 +10,50 @@ print_str:
 	jmp .print
 .return:
 	ret
+
+; modify eax, ebx, ecx, edx
+print_hex:
+	mov ebx, 0x10
+	jmp print_num
+print_dec:
+	mov ebx, 10
+print_num:
+	xor ecx, ecx
+.convert:
+	inc ecx
+	xor edx, edx
+	div ebx
+	cmp dl, 10
+	jb .digit
+	add dl, 'A'-10
+	jmp .next
+.digit:
+	add dl, '0'
+.next:
+	push dx
+	cmp eax, 0
+	jne .convert
+.print:
+	cmp ecx, 0
+	je .return
+	dec ecx
+	pop ax
+	mov ah, 0x0E
+	int 0x10
+	jmp .print
+.return:
+	ret
+
+newline:
+	mov al, 10
+	call print_chr
+
+	mov al, 13
+	call print_chr
+
+	ret
+
+print_chr:
+	mov ah, 0x0E
+	int 0x10
+	ret