forked from backup/30dayMakeOS
111 lines
3.5 KiB
C
111 lines
3.5 KiB
C
void io_hlt(void);
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void io_cli(void);
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void io_out8(int port, int data);
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int io_load_eflags(void);
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void io_store_eflags(int eflags);
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void init_palette(void);
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void set_palette(int start, int end, unsigned char *rgb);
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void boxfill8(unsigned char *vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1);
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#define COL8_000000 0
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#define COL8_FF0000 1
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#define COL8_00FF00 2
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#define COL8_FFFF00 3
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#define COL8_0000FF 4
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#define COL8_FF00FF 5
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#define COL8_00FFFF 6
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#define COL8_FFFFFF 7
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#define COL8_C6C6C6 8
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#define COL8_840000 9
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#define COL8_008400 10
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#define COL8_848400 11
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#define COL8_000084 12
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#define COL8_840084 13
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#define COL8_008484 14
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#define COL8_848484 15
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void HariMain(void)
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{
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char *vram;/* 声明变量vram、用于BYTE [...]地址 */
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int xsize, ysize;
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init_palette();/* 设定调色板 */
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vram = (char *) 0xa0000;/* 地址变量赋值 */
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xsize = 320;
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ysize = 200;
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/* 根据 0xa0000 + x + y * 320 计算坐标 8*/
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boxfill8(vram, xsize, COL8_008484, 0, 0, xsize - 1, ysize - 29);
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boxfill8(vram, xsize, COL8_C6C6C6, 0, ysize - 28, xsize - 1, ysize - 28);
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boxfill8(vram, xsize, COL8_FFFFFF, 0, ysize - 27, xsize - 1, ysize - 27);
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boxfill8(vram, xsize, COL8_C6C6C6, 0, ysize - 26, xsize - 1, ysize - 1);
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boxfill8(vram, xsize, COL8_FFFFFF, 3, ysize - 24, 59, ysize - 24);
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boxfill8(vram, xsize, COL8_FFFFFF, 2, ysize - 24, 2, ysize - 4);
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boxfill8(vram, xsize, COL8_848484, 3, ysize - 4, 59, ysize - 4);
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boxfill8(vram, xsize, COL8_848484, 59, ysize - 23, 59, ysize - 5);
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boxfill8(vram, xsize, COL8_000000, 2, ysize - 3, 59, ysize - 3);
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boxfill8(vram, xsize, COL8_000000, 60, ysize - 24, 60, ysize - 3);
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boxfill8(vram, xsize, COL8_848484, xsize - 47, ysize - 24, xsize - 4, ysize - 24);
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boxfill8(vram, xsize, COL8_848484, xsize - 47, ysize - 23, xsize - 47, ysize - 4);
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boxfill8(vram, xsize, COL8_FFFFFF, xsize - 47, ysize - 3, xsize - 4, ysize - 3);
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boxfill8(vram, xsize, COL8_FFFFFF, xsize - 3, ysize - 24, xsize - 3, ysize - 3);
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for (;;) {
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io_hlt();
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}
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}
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void init_palette(void)
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{
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static unsigned char table_rgb[16 * 3] = {
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0x00, 0x00, 0x00, /* 0:黑 */
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0xff, 0x00, 0x00, /* 1:梁红 */
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0x00, 0xff, 0x00, /* 2:亮绿 */
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0xff, 0xff, 0x00, /* 3:亮黄 */
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0x00, 0x00, 0xff, /* 4:亮蓝 */
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0xff, 0x00, 0xff, /* 5:亮紫 */
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0x00, 0xff, 0xff, /* 6:浅亮蓝 */
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0xff, 0xff, 0xff, /* 7:白 */
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0xc6, 0xc6, 0xc6, /* 8:亮灰 */
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0x84, 0x00, 0x00, /* 9:暗红 */
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0x00, 0x84, 0x00, /* 10:暗绿 */
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0x84, 0x84, 0x00, /* 11:暗黄 */
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0x00, 0x00, 0x84, /* 12:暗青 */
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0x84, 0x00, 0x84, /* 13:暗紫 */
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0x00, 0x84, 0x84, /* 14:浅暗蓝 */
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0x84, 0x84, 0x84 /* 15:暗灰 */
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};
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set_palette(0, 15, table_rgb);
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return;
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/* 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 */
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}
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void set_palette(int start, int end, unsigned char *rgb)
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{
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int i, eflags;
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eflags = io_load_eflags(); /* 记录中断许可标志的值 */
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io_cli(); /* 将中断许可标志置为0,禁止中断 */
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io_out8(0x03c8, start);
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for (i = start; i <= end; i++) {
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io_out8(0x03c9, rgb[0] / 4);
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io_out8(0x03c9, rgb[1] / 4);
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io_out8(0x03c9, rgb[2] / 4);
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rgb += 3;
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}
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io_store_eflags(eflags); /* 复原中断许可标志 */
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return;
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}
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void boxfill8(unsigned char *vram, int xsize, unsigned char c, int x0, int y0, int x1, int y1)
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{
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int x, y;
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for (y = y0; y <= y1; y++) {
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for (x = x0; x <= x1; x++)
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vram[y * xsize + x] = c;
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}
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return;
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} |