mirror of
https://github.com/yourtion/30dayMakeOS.git
synced 2026-02-03 01:53:24 +08:00
287 lines
7.7 KiB
C
287 lines
7.7 KiB
C
#include <stdio.h>
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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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void init_screen(char *vram, int x, int y);
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void putfont8(char *vram, int xsize, int x, int y, char c, char *font);
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void putfonts8_asc(char *vram, int xsize, int x, int y, char c, unsigned char *s);
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void init_mouse_cursor8(char *mouse, char bc);
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void putblock8_8(char *vram, int vxsize, int pxsize, int pysize, int px0, int py0, char *buf, int bxsize);
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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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struct BOOTINFO {
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char cyls, leds, vmode, reserve;
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short scrnx, scrny;
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char *vram;
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};
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struct SEGMENT_DESCRIPTOR {
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short limit_low, base_low;
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char base_mid, access_right;
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char limit_high, base_high;
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};
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struct GATE_DESCRIPTOR {
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short offset_low, selector;
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char dw_count, access_right;
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short offset_high;
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};
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void init_gdtidt(void);
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void set_segmdesc(struct SEGMENT_DESCRIPTOR *sd, unsigned int limit, int base, int ar);
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void set_gatedesc(struct GATE_DESCRIPTOR *gd, int offset, int selector, int ar);
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void load_gdtr(int limit, int addr);
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void load_idtr(int limit, int addr);
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void HariMain(void)
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{
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struct BOOTINFO *binfo = (struct BOOTINFO *) 0x0ff0;
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char s[40], mcursor[256];
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int mx, my;
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init_palette();
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init_screen(binfo->vram, binfo->scrnx, binfo->scrny);
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/* 显示鼠标 */
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mx = (binfo->scrnx - 16) / 2; /* 计算画面的中心坐标*/
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my = (binfo->scrny - 28 - 16) / 2;
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init_mouse_cursor8(mcursor, COL8_008484);
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putblock8_8(binfo->vram, binfo->scrnx, 16, 16, mx, my, mcursor, 16);
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putfonts8_asc(binfo->vram, binfo->scrnx, 8, 8, COL8_FFFFFF, "ABC 123");
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putfonts8_asc(binfo->vram, binfo->scrnx, 31, 31, COL8_000000, "Haribote OS.");
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putfonts8_asc(binfo->vram, binfo->scrnx, 30, 30, COL8_FFFFFF, "Haribote OS.");
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sprintf(s, "scrnx = %d", binfo->scrnx);
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putfonts8_asc(binfo->vram, binfo->scrnx, 16, 64, COL8_FFFFFF, s);
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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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}
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void init_screen(char *vram, int x, int y)
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{
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boxfill8(vram, x, COL8_008484, 0, 0, x - 1, y - 29);
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boxfill8(vram, x, COL8_C6C6C6, 0, y - 28, x - 1, y - 28);
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boxfill8(vram, x, COL8_FFFFFF, 0, y - 27, x - 1, y - 27);
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boxfill8(vram, x, COL8_C6C6C6, 0, y - 26, x - 1, y - 1);
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boxfill8(vram, x, COL8_FFFFFF, 3, y - 24, 59, y - 24);
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boxfill8(vram, x, COL8_FFFFFF, 2, y - 24, 2, y - 4);
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boxfill8(vram, x, COL8_848484, 3, y - 4, 59, y - 4);
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boxfill8(vram, x, COL8_848484, 59, y - 23, 59, y - 5);
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boxfill8(vram, x, COL8_000000, 2, y - 3, 59, y - 3);
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boxfill8(vram, x, COL8_000000, 60, y - 24, 60, y - 3);
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boxfill8(vram, x, COL8_848484, x - 47, y - 24, x - 4, y - 24);
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boxfill8(vram, x, COL8_848484, x - 47, y - 23, x - 47, y - 4);
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boxfill8(vram, x, COL8_FFFFFF, x - 47, y - 3, x - 4, y - 3);
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boxfill8(vram, x, COL8_FFFFFF, x - 3, y - 24, x - 3, y - 3);
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return;
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}
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void putfont8(char *vram, int xsize, int x, int y, char c, char *font)
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{
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int i;
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char *p, d /* data */;
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for (i = 0; i < 16; i++) {
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p = vram + (y + i) * xsize + x;
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d = font[i];
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if ((d & 0x80) != 0) { p[0] = c; }
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if ((d & 0x40) != 0) { p[1] = c; }
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if ((d & 0x20) != 0) { p[2] = c; }
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if ((d & 0x10) != 0) { p[3] = c; }
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if ((d & 0x08) != 0) { p[4] = c; }
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if ((d & 0x04) != 0) { p[5] = c; }
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if ((d & 0x02) != 0) { p[6] = c; }
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if ((d & 0x01) != 0) { p[7] = c; }
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}
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return;
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}
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void putfonts8_asc(char *vram, int xsize, int x, int y, char c, unsigned char *s)
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{
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extern char hankaku[4096];
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/* C语言中，字符串都是以0x00结尾 */
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for (; *s != 0x00; s++) {
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putfont8(vram, xsize, x, y, c, hankaku + *s * 16);
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x += 8;
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}
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return;
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}
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void init_mouse_cursor8(char *mouse, char bc)
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/* マウスカーソルを準備（16x16） */
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{
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static char cursor[16][16] = {
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"**************..",
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"*OOOOOOOOOOO*...",
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"*OOOOOOOOOO*....",
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"*OOOOOOOOO*.....",
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"*OOOOOOOO*......",
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"*OOOOOOO*.......",
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"*OOOOOOO*.......",
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"*OOOOOOOO*......",
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"*OOOO**OOO*.....",
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"*OOO*..*OOO*....",
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"*OO*....*OOO*...",
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"*O*......*OOO*..",
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"**........*OOO*.",
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"*..........*OOO*",
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"............*OO*",
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".............***"
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};
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int x, y;
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for (y = 0; y < 16; y++) {
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for (x = 0; x < 16; x++) {
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if (cursor[y][x] == '*') {
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mouse[y * 16 + x] = COL8_000000;
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}
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if (cursor[y][x] == 'O') {
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mouse[y * 16 + x] = COL8_FFFFFF;
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}
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if (cursor[y][x] == '.') {
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mouse[y * 16 + x] = bc;
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}
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}
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}
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return;
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}
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void putblock8_8(char *vram, int vxsize, int pxsize,
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int pysize, int px0, int py0, char *buf, int bxsize)
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{
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int x, y;
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for (y = 0; y < pysize; y++) {
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for (x = 0; x < pxsize; x++) {
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vram[(py0 + y) * vxsize + (px0 + x)] = buf[y * bxsize + x];
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}
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}
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return;
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}
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void init_gdtidt(void)
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{
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struct SEGMENT_DESCRIPTOR *gdt = (struct SEGMENT_DESCRIPTOR *) 0x00270000;
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struct GATE_DESCRIPTOR *idt = (struct GATE_DESCRIPTOR *) 0x0026f800;
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int i;
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/* GDT初始化 */
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for (i = 0; i < 8192; i++) {
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set_segmdesc(gdt + i, 0, 0, 0);
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}
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set_segmdesc(gdt + 1, 0xffffffff, 0x00000000, 0x4092);
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set_segmdesc(gdt + 2, 0x0007ffff, 0x00280000, 0x409a);
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load_gdtr(0xffff, 0x00270000);
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/* IDT初始化 */
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for (i = 0; i < 256; i++) {
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set_gatedesc(idt + i, 0, 0, 0);
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}
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load_idtr(0x7ff, 0x0026f800);
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return;
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}
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void set_segmdesc(struct SEGMENT_DESCRIPTOR *sd, unsigned int limit, int base, int ar)
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{
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if (limit > 0xfffff) {
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ar |= 0x8000; /* G_bit = 1 */
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limit /= 0x1000;
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}
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sd->limit_low = limit & 0xffff;
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sd->base_low = base & 0xffff;
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sd->base_mid = (base >> 16) & 0xff;
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sd->access_right = ar & 0xff;
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sd->limit_high = ((limit >> 16) & 0x0f) | ((ar >> 8) & 0xf0);
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sd->base_high = (base >> 24) & 0xff;
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return;
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}
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void set_gatedesc(struct GATE_DESCRIPTOR *gd, int offset, int selector, int ar)
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{
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gd->offset_low = offset & 0xffff;
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gd->selector = selector;
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gd->dw_count = (ar >> 8) & 0xff;
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gd->access_right = ar & 0xff;
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gd->offset_high = (offset >> 16) & 0xffff;
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return;
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}
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