绘制一个简单的视图

04_day/bootpack.c

@@ -1,15 +1,111 @@
 void io_hlt(void);
-void write_mem8(int addr, int data);
+void io_cli(void);
+void io_out8(int port, int data);
+int io_load_eflags(void);
+void io_store_eflags(int eflags);
+
+void init_palette(void);
+void set_palette(int start, int end, unsigned char *rgb);
+void boxfill8(unsigned char *vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1);
+
+#define COL8_000000		0
+#define COL8_FF0000		1
+#define COL8_00FF00		2
+#define COL8_FFFF00		3
+#define COL8_0000FF		4
+#define COL8_FF00FF		5
+#define COL8_00FFFF		6
+#define COL8_FFFFFF		7
+#define COL8_C6C6C6		8
+#define COL8_840000		9
+#define COL8_008400		10
+#define COL8_848400		11
+#define COL8_000084		12
+#define COL8_840084		13
+#define COL8_008484		14
+#define COL8_848484		15
 
 void HariMain(void)
 {
-	int i; /* 声明变量，i是32位整数 */
+	char *vram;/* 声明变量vram、用于BYTE [...]地址 */
+	int xsize, ysize;
 
-	for (i = 0xa0000; i <= 0xaffff; i++) {
-		write_mem8(i, i & 0x0f);
-	}
+	init_palette();/* 设定调色板 */
+	vram = (char *) 0xa0000;/* 地址变量赋值 */
+	xsize = 320;
+	ysize = 200;
+
+	/* 根据 0xa0000 + x + y * 320 计算坐标 8*/
+	boxfill8(vram, xsize, COL8_008484,  0,         0,          xsize -  1, ysize - 29);
+	boxfill8(vram, xsize, COL8_C6C6C6,  0,         ysize - 28, xsize -  1, ysize - 28);
+	boxfill8(vram, xsize, COL8_FFFFFF,  0,         ysize - 27, xsize -  1, ysize - 27);
+	boxfill8(vram, xsize, COL8_C6C6C6,  0,         ysize - 26, xsize -  1, ysize -  1);
+
+	boxfill8(vram, xsize, COL8_FFFFFF,  3,         ysize - 24, 59,         ysize - 24);
+	boxfill8(vram, xsize, COL8_FFFFFF,  2,         ysize - 24,  2,         ysize -  4);
+	boxfill8(vram, xsize, COL8_848484,  3,         ysize -  4, 59,         ysize -  4);
+	boxfill8(vram, xsize, COL8_848484, 59,         ysize - 23, 59,         ysize -  5);
+	boxfill8(vram, xsize, COL8_000000,  2,         ysize -  3, 59,         ysize -  3);
+	boxfill8(vram, xsize, COL8_000000, 60,         ysize - 24, 60,         ysize -  3);
+
+	boxfill8(vram, xsize, COL8_848484, xsize - 47, ysize - 24, xsize -  4, ysize - 24);
+	boxfill8(vram, xsize, COL8_848484, xsize - 47, ysize - 23, xsize - 47, ysize -  4);
+	boxfill8(vram, xsize, COL8_FFFFFF, xsize - 47, ysize -  3, xsize -  4, ysize -  3);
+	boxfill8(vram, xsize, COL8_FFFFFF, xsize -  3, ysize - 24, xsize -  3, ysize -  3);
 
 	for (;;) {
 		io_hlt();
 	}
 }
+
+void init_palette(void)
+{
+	static unsigned char table_rgb[16 * 3] = {
+		0x00, 0x00, 0x00,	/*  0:黑 */
+		0xff, 0x00, 0x00,	/*  1:梁红 */
+		0x00, 0xff, 0x00,	/*  2:亮绿 */
+		0xff, 0xff, 0x00,	/*  3:亮黄 */
+		0x00, 0x00, 0xff,	/*  4:亮蓝 */
+		0xff, 0x00, 0xff,	/*  5:亮紫 */
+		0x00, 0xff, 0xff,	/*  6:浅亮蓝 */
+		0xff, 0xff, 0xff,	/*  7:白 */
+		0xc6, 0xc6, 0xc6,	/*  8:亮灰 */
+		0x84, 0x00, 0x00,	/*  9:暗红 */
+		0x00, 0x84, 0x00,	/* 10:暗绿 */
+		0x84, 0x84, 0x00,	/* 11:暗黄 */
+		0x00, 0x00, 0x84,	/* 12:暗青 */
+		0x84, 0x00, 0x84,	/* 13:暗紫 */
+		0x00, 0x84, 0x84,	/* 14:浅暗蓝 */
+		0x84, 0x84, 0x84	/* 15:暗灰 */
+	};
+	set_palette(0, 15, table_rgb);
+	return;
+
+	/* C语言中的static char语句只能用于数据，相当于汇编中的DB指令 */
+}
+
+void set_palette(int start, int end, unsigned char *rgb)
+{
+	int i, eflags;
+	eflags = io_load_eflags();	/* 记录中断许可标志的值 */
+	io_cli(); 					/* 将中断许可标志置为0,禁止中断 */
+	io_out8(0x03c8, start);
+	for (i = start; i <= end; i++) {
+		io_out8(0x03c9, rgb[0] / 4);
+		io_out8(0x03c9, rgb[1] / 4);
+		io_out8(0x03c9, rgb[2] / 4);
+		rgb += 3;
+	}
+	io_store_eflags(eflags);	/* 复原中断许可标志 */
+	return;
+}
+
+void boxfill8(unsigned char *vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1)
+{
+	int x, y;
+	for (y = y0; y <= y1; y++) {
+		for (x = x0; x <= x1; x++)
+			vram[y * xsize + x] = c;
+	}
+	return;
+}

04_day/naskfunc.nas

@@ -2,11 +2,14 @@
 ; TAB=4
 
 [FORMAT "WCOFF"]				; 制作目标文件的模式	
-[INSTRSET "i486p"]				; 制定使用486编译
+[INSTRSET "i486p"]				; 使用到486为止的指令
 [BITS 32]						; 3制作32位模式用的机器语言
 [FILE "naskfunc.nas"]			; 文件名
 
-		GLOBAL	_io_hlt,_write_mem8
+		GLOBAL	_io_hlt, _io_cli, _io_sti, _io_stihlt
+		GLOBAL	_io_in8,  _io_in16,  _io_in32
+		GLOBAL	_io_out8, _io_out16, _io_out32
+		GLOBAL	_io_load_eflags, _io_store_eflags
 
 [SECTION .text]
 
@@ -14,8 +17,61 @@ _io_hlt:	; void io_hlt(void);
 		HLT
 		RET
 
-_write_mem8:	; void write_mem8(int addr, int data);
-		MOV		ECX,[ESP+4]		; [ESP+4]中存放的是地址，将其读入ECX
-		MOV		AL,[ESP+8]		; [ESP+8]中存放的是数据，将其读入AL
-		MOV		[ECX],AL
+_io_cli:	; void io_cli(void);
+		CLI
+		RET
+
+_io_sti:	; void io_sti(void);
+		STI
+		RET
+
+_io_stihlt:	; void io_stihlt(void);
+		STI
+		HLT
+		RET
+
+_io_in8:	; int io_in8(int port);
+		MOV		EDX,[ESP+4]		; port
+		MOV		EAX,0
+		IN		AL,DX
+		RET
+
+_io_in16:	; int io_in16(int port);
+		MOV		EDX,[ESP+4]		; port
+		MOV		EAX,0
+		IN		AX,DX
+		RET
+
+_io_in32:	; int io_in32(int port);
+		MOV		EDX,[ESP+4]		; port
+		IN		EAX,DX
+		RET
+
+_io_out8:	; void io_out8(int port, int data);
+		MOV		EDX,[ESP+4]		; port
+		MOV		AL,[ESP+8]		; data
+		OUT		DX,AL
+		RET
+
+_io_out16:	; void io_out16(int port, int data);
+		MOV		EDX,[ESP+4]		; port
+		MOV		EAX,[ESP+8]		; data
+		OUT		DX,AX
+		RET
+
+_io_out32:	; void io_out32(int port, int data);
+		MOV		EDX,[ESP+4]		; port
+		MOV		EAX,[ESP+8]		; data
+		OUT		DX,EAX
+		RET
+
+_io_load_eflags:	; int io_load_eflags(void);
+		PUSHFD		; PUSH EFLAGS 
+		POP		EAX
+		RET
+
+_io_store_eflags:	; void io_store_eflags(int eflags);
+		MOV		EAX,[ESP+4]
+		PUSH	EAX
+		POPFD		; POP EFLAGS 
 		RET