finish

.gitignore

@@ -0,0 +1,2 @@
+*.bin
+*.img

Makefile

@@ -0,0 +1,19 @@
+CC = gcc
+ASM = nasm
+QEMU = qemu
+IMG = boot.bin
+
+boot.bin: boot.asm
+	$(ASM) $< -o $@
+
+compile: boot.bin
+
+.DEFAULT_GOAL=compile
+
+run: compile
+	$(QEMU) -boot order=c -drive file=$(IMG),format=raw
+
+clean:
+	rm boot.bin
+
+.PHONY: compile clean run

boot.asm

@@ -5,14 +5,27 @@
     call   DispStr           ; 调用显示字符串例程
     jmp    $                 ; 无限循环  
 DispStr:
-    mov    ax, BootMessage
-    mov    bp, ax            ; ES:BP = 串地址
-    mov    cx, 16            ; CX = 串长度
-    mov    ax, 01301h        ; AH = 13,  AL = 01h
-    mov    bx, 000ch         ; 页号为0(BH = 0) 黑底红字(BL = 0Ch,高亮)
-    mov    dl, 0
+    mov     ax, 0600h
+    mov     bx, 0h
+    mov     cx, 0h
+    mov     dh, 25-1
+    mov     dl, 80-1        ; vga text-mode: 80x25
+    int     10h             ; clear screen
+    mov     ax, 0200h
+    mov     bx, 0h
+    mov     dx, 1326h       ; 19=13H, 38=26H
+    int     10h             ; set cursor position
+    mov     ax, NWPU
+    mov     bp, ax            ; ES:BP = 串地址, es has been set to the same seg
+    mov     cx, 4             ; CX = 串长度
+    mov     ax, 01300h        ; AH = 13,  AL = 01h
+    mov     bx, 00f9h         ; 页号为0(BH = 0) 黑底红字(BL = 0Ch,高亮)
     int     10h               ; 10h 号中断
+    mov     ax, 0200h
+    mov     bx, 0h
+    mov     dx, 0h
+    int     10H             ; reset cursor to 0,0
     ret
-BootMessage:             db    "Hello, OS world!"
+NWPU:                    db    "NWPU"
 times      510-($-$$)    db    0    ; 填充剩下的空间，使生成的二进制代码恰好为512字节
 dw         0xaa55                   ; 结束标志