forked from backup/30dayMakeOS
71 lines
1.6 KiB
C
71 lines
1.6 KiB
C
/* 鼠标控制代码 */
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#include "bootpack.h"
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struct FIFO8 mousefifo;
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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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unsigned char data;
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io_out8(PIC1_OCW2, 0x64); /* 通知PIC IRQ-12 已经受理完毕 */
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io_out8(PIC0_OCW2, 0x62); /* 通知PIC IRQ-02 已经受理完毕 */
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data = io_in8(PORT_KEYDAT);
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fifo8_put(&mousefifo, data);
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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 MOUSE_DEC *mdec) {
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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)会被送过来 */
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mdec->phase = 0; /* 等待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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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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mdec->buf[0] = dat;
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mdec->phase = 2;
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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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/* 鼠标的y方向与画面符号相反 */
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mdec->y = - mdec->y;
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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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