"Hello"を出力するサンプルを追加

Author: Yuma Arakawa

.gitignore

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+*~
+*.o
+*.bin
+*.dat
+*.img

Makefile

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+AS = as
+
+.s.o:
+	$(AS) -o $*.o $<
+
+all: fd.img
+
+fd.img: hello.o signature.dat
+	objcopy -O binary hello.o hello.bin
+	dd if=/dev/zero of=zero.dat bs=1 count=$$((510 - $$(stat -c%s hello.bin)))
+	cat hello.bin zero.dat signature.dat > fd.img
+
+hello.o: hello.s
+
+signature.dat:
+	bash -c 'echo -en "\x55\xaa" > signature.dat'
+
+clean:
+	rm -f *~ *.o *.bin *.dat *.img
+
+run: fd.img
+	qemu -fda fd.img

hello.s

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+	.code16
+
+	/* ビデオモード設定(画面クリア) */
+	movw	$0x0000, %ax
+	int		$0x10
+
+	/* 文字列出力 */
+	BOOTSEG = 0x07c0
+	movw	$0x0000, %dx
+	movw	$5, %cx
+	movw	$0x0007, %bx
+	movw	$BOOTSEG, %ax
+	movw	%ax, %es
+	movw	$msg, %bp
+	movw	$0x1301, %ax
+	int		$0x10
+
+end:
+	jmp		end
+
+msg:
+	.ascii	"Hello"