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