add a "I'm bootable" msg at top

2021-08-16 19:19:47 +02:00 · 2021-08-16 19:19:47 +02:00 · cdaa4d1c68
parent 3fe0dccba6
commit cdaa4d1c68
2 changed files with 7 additions and 1 deletions
--- a/4
+++ b/4
@ -4,9 +4,11 @@ boot.bin: boot.o
 boot.o: boot.s
 	as -o $@ $<

-.PHONY: boot disasm
+.PHONY: boot disasm hexdump
 boot: boot.bin
 	qemu-system-i386 -drive file=$^,index=0,if=floppy,format=raw

 disasm: boot.bin
 	objdump -D -b binary -mi8086 $^
+hexdump: boot.bin
+	hexdump $^ -C
--- a/boot.s
+++ b/boot.s
@ -2,6 +2,10 @@

 .global _start # the linker needs to find it
 _start:
+	jmp _real_start
+	.ascii "I'm bootable!"
+
+_real_start:
 	# enter mode 13h
 	mov $0x13, %ax
 	int $0x10