mirror of
https://github.com/yourtion/30dayMakeOS.git
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79 lines
1.8 KiB
C
79 lines
1.8 KiB
C
/* 鼠标控制代码 */
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#include "bootpack.h"
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struct FIFO32 *mousefifo;
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int mousedata0;
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void inthandler2c(int *esp)
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/* 来自PS/2鼠标的中断 */
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{
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int data;
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io_out8(PIC1_OCW2, 0x64); /* 把IRQ-12接收信号结束的信息通知给PIC1 */
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io_out8(PIC0_OCW2, 0x62); /* 把IRQ-02接收信号结束的信息通知给PIC0 */
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data = io_in8(PORT_KEYDAT);
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fifo32_put(mousefifo, data + mousedata0);
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return;
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}
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#define KEYCMD_SENDTO_MOUSE 0xd4
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#define MOUSECMD_ENABLE 0xf4
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void enable_mouse(struct FIFO32 *fifo, int data0, struct MOUSE_DEC *mdec)
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{
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/* 将FIFO缓冲区的信息保存到全局变量里 */
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mousefifo = fifo;
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mousedata0 = data0;
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/* 鼠标有效 */
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wait_KBC_sendready();
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io_out8(PORT_KEYCMD, KEYCMD_SENDTO_MOUSE);
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wait_KBC_sendready();
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io_out8(PORT_KEYDAT, MOUSECMD_ENABLE);
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/* 顺利的话，ACK(0xfa)会被发送*/
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mdec->phase = 0; /* 等待鼠标的0xfa的阶段*/
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return;
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}
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int mouse_decode(struct MOUSE_DEC *mdec, unsigned char dat)
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{
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if (mdec->phase == 0) {
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/* 等待鼠标的0xfa的阶段 */
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if (dat == 0xfa) {
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mdec->phase = 1;
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}
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return 0;
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}
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if (mdec->phase == 1) {
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/* 等待鼠标第一字节的阶段 */
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if ((dat & 0xc8) == 0x08) {
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mdec->buf[0] = dat;
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mdec->phase = 2;
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}
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return 0;
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}
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if (mdec->phase == 2) {
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/* 等待鼠标第二字节的阶段 */
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mdec->buf[1] = dat;
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mdec->phase = 3;
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return 0;
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}
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if (mdec->phase == 3) {
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/* 等待鼠标第二字节的阶段 */
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mdec->buf[2] = dat;
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mdec->phase = 1;
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mdec->btn = mdec->buf[0] & 0x07;
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mdec->x = mdec->buf[1];
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mdec->y = mdec->buf[2];
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if ((mdec->buf[0] & 0x10) != 0) {
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mdec->x |= 0xffffff00;
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}
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if ((mdec->buf[0] & 0x20) != 0) {
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mdec->y |= 0xffffff00;
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}
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mdec->y = - mdec->y; /* 鼠标的y方向与画面符号相反 */
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return 1;
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}
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/* 应该不可能到这里来 */
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return -1;
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}
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