add serial

Makefile

@@ -72,7 +72,8 @@ cdimg: os.img
 	genisoimage -pad -b os.img -R -o cd.img os.img
 .PHONY: strip
 strip: os.img
-	python3 strip.py
+	sed '$ s/\x00*$//' < os.img > tmp.img
+	mv tmp.img os.img
 .PHONY: runkvm
 runkvm: os.img
-	qemu-system-x86_64 -drive file=$<,format=raw --enable-kvm
+	qemu-system-x86_64 -drive file=$<,format=raw --enable-kvm -serial stdio

software_src/serial

+org 0x7c00
+bits 16
+
+print:	mov si, msg
+	mov ah, 0x0e
+	mov bx, 0x0007
+loop:	lodsb
+	test al, al
+	je init
+	int 0x10
+	jmp loop
+init:	mov ax, 0b0000000011100011
+	mov dx, 0x0000
+main:	call send
+	call recv
+	jmp short main
+send:	pusha
+	mov ah, 0x01
+	int 0x16
+	jnz send2
+	jmp short send3
+send2:	xor ax, ax
+	int 0x16
+	mov ah, 0x01
+	int 0x14
+	cmp al, 0x0d
+	je send4
+send5:	int 0x22
+	cmp al, 0x08
+	jne send3
+	mov al, 0x20
+	int 0x22
+	mov al, 0x08
+	int 0x22
+send3:	popa
+	ret
+send4:	push ax
+	mov al, 0x0d
+	int 0x14
+	pop ax
+	jmp short send5
+recv:	pusha
+	mov ah, 0x02
+	and ah, 0b01000000
+	je recv2
+	mov ah, 0x0e
+	mov bx, 0x0007
+	int 0x10
+recv2:	popa
+	ret	
+msg:	db "Serial client by Jakob Kirsch", 0x0a, 0x0d, 0x00
+times 512 - ($ - $$) nop
\ No newline at end of file