better mouse driver
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catfood
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88ec7f1be2
commit
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3
.gitignore
vendored
3
.gitignore
vendored
@ -1,2 +1,3 @@
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obj/
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iso/
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iso/
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.vscode/
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@ -15,7 +15,7 @@
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/* Macros Declaration */
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/************************************************************************/
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#define KB_IN_BYTES 320 /* size of keyboard input buffer */ /* FIXME */
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#define MOUSE_IN_BYTES 3
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#define MOUSE_IN_BYTES 4
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#define MAP_COLS 3 /* Number of columns in keymap */
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#define NR_SCAN_CODES 0x80 /* Number of scan codes (rows in keymap) */
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@ -119,7 +119,18 @@
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#define PAD_MID PAD_5 /* Middle key */
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#define PAD_DEL PAD_DOT /* Del */
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#define PS2_PORT_DATA (0x60)
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#define PS2_PORT_CMD (0x64)
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#define PS2_CMD_2ND_OUT (0xD4)
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#define PS2_CMD_2ND_ENB (0xA8)
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#define PS2_CMD_READRAM (0x20)
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#define PS2_CMD_SET_DEFAULT (0xF6)
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#define PS2_CMD_DATA_REPORT_DIS (0xF5)
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#define PS2_CMD_DATA_REPORT_ENB (0xF4)
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#define PS2_CMD_SAMPLE_RATE (0xF3)
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#define PS2_CMD_GET_DEVICE (0xF2)
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#define PS2_ACK (0xfa)
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/************************************************************************/
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/* Stucture Definition */
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/************************************************************************/
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@ -1217,8 +1217,8 @@ static int do_rdwt(MESSAGE *fs_msg)
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//added by mingxuan 2019-5-19
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int dev = pin->i_start_sect;
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int nr_tty = MINOR(dev);
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if(MAJOR(dev) != 4) {
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panic("Error: MAJOR(dev) == 4\n");
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if(MAJOR(dev) != DEV_CHAR_TTY) {
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panic("Error: MAJOR(dev) should be DEV_CHAR_TTY(4)\n");
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}
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if(fs_msg->type == DEV_READ){
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@ -10,6 +10,8 @@
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#include "keyboard.h"
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#include "keymap.h"
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#include "x86.h"
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#include "stdio.h"
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#include "assert.h"
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static KB_INPUT kb_in;
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@ -33,10 +35,54 @@ static void set_leds();
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static void set_mouse_leds();
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static void kb_wait();
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// static void kb_ack();
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/*
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* Helper Procedures for PS/2 Mouse Operation
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* */
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static void mouse_wait(u8 a_type) {
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int _time_out=100000;
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if(a_type==0) {
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while(_time_out--) if((inb(PS2_PORT_CMD) & 1)==1) return;
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return;
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}
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else {
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while(_time_out--) if((inb(PS2_PORT_CMD) & 2)==0) return;
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return;
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}
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}
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static void mouse_write(u8 a_write) {
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mouse_wait(1);//Wait to be able to send a command
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outb(PS2_PORT_CMD, PS2_CMD_2ND_OUT);//Tell the mouse we are sending a command
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mouse_wait(1);//Wait for the final part
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outb(PS2_PORT_DATA, a_write);//Finally write
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}
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//Get's response from mouse
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static u8 mouse_read() {
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mouse_wait(0);
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return inb(PS2_PORT_DATA);
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}
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static void mouse_set_rate(u8 rate) {
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mouse_write(0xf3); // set sample rate cmd
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assert(mouse_read() == PS2_ACK);
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mouse_write(rate);
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assert(mouse_read() == PS2_ACK);
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}
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static u8 mouse_get_id() {
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mouse_write(PS2_CMD_DATA_REPORT_DIS);
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assert(mouse_read() == PS2_ACK);
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mouse_write(PS2_CMD_GET_DEVICE); // report
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assert(mouse_read() == PS2_ACK);
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u8 device_type = mouse_read();
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mouse_write(PS2_CMD_DATA_REPORT_ENB);
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assert(mouse_read() == PS2_ACK);
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return device_type;
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}
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void kb_handler(int irq){
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u8 scan_code = inb(0x60);
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u8 scan_code = inb(PS2_PORT_DATA);
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if(kb_in.count < KB_IN_BYTES){
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*(kb_in.p_head) = scan_code;
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kb_in.p_head++;
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@ -52,14 +98,13 @@ void kb_handler(int irq){
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#define TTY_END (tty_table+NR_CONSOLES)
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void mouse_handler(int irq){
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u8 scan_code = inb(0x60);
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if(!mouse_init){
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mouse_init = 1;
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return;
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}
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u8 scan_code = inb(PS2_PORT_DATA);
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mouse_in.buf[mouse_in.count]=scan_code;
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mouse_in.count++;
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if(mouse_in.count==3){
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if ((mouse_in.buf[0] & 0xc8) == 0x08)
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mouse_in.count++; // simple trick to sync mouse data
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if(mouse_in.count==4){
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// printf("0x%02x 0x%02x 0x%02x 0x%02x\n", mouse_in.buf[0], mouse_in.buf[1], mouse_in.buf[2], mouse_in.buf[3]);
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TTY* p_tty;
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for (p_tty = TTY_FIRST; p_tty < TTY_END; p_tty++) {
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if(p_tty->console==&console_table[current_console]){
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@ -92,16 +137,35 @@ void mouse_handler(int irq){
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mouse_in.count=0;
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}
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}
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void init_mouse(){
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mouse_in.count = 0;
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put_irq_handler(MOUSE_IRQ,mouse_handler);
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enable_irq(MOUSE_IRQ);
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mouse_wait(1);
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outb(PS2_PORT_CMD, PS2_CMD_2ND_ENB); // Enable second PS/2 port
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mouse_wait(1);
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outb(PS2_PORT_CMD, PS2_CMD_READRAM);// Read "byte 0" from internal RAM
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mouse_wait(0);
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u8 _status = inb(PS2_PORT_DATA) | 0x2; // bit-1 <=> Second PS/2 port interrupt
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mouse_wait(1);
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outb(PS2_PORT_CMD, PS2_PORT_DATA); // Write next byte to "byte 0" of internal RAM
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mouse_wait(1);
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outb(PS2_PORT_DATA, _status); // Write back to internal RAM
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mouse_write(PS2_CMD_SET_DEFAULT); // Set Defaults
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assert(mouse_read() == PS2_ACK);
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mouse_write(PS2_CMD_DATA_REPORT_ENB); // Enable Data Reporting
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assert(mouse_read() == PS2_ACK); // Remember to read ACK, or it may block
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assert(mouse_get_id() == 0x00); // by init, id should be 0(standard ps/2 mouse)
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mouse_set_rate(200);
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mouse_set_rate(100);
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mouse_set_rate(80); // tricks to enable z-axis, from osdev
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assert(mouse_get_id() == 0x03); // z-axis enabled, id should be 3 (Mouse with scroll wheel)
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mouse_write(PS2_CMD_DATA_REPORT_ENB);
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assert(mouse_read() == PS2_ACK);
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}
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void init_kb(){
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@ -325,7 +325,7 @@ int do_vwrite(int fd, const char *buf, int count) {
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bytes = vfs_table[index].op->write(fd,s,iobytes); //modified by mingxuan 2020-10-18
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if(bytes != iobytes)
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{
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return bytes;
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return bytes; // TODO: Maybe problematic
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}
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f_len -= bytes;
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}
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19
注释.md
Normal file
19
注释.md
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@ -0,0 +1,19 @@
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# 代码注释
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## 文件系统逻辑
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文件系统里面的东西写的比较奇怪，他的目录构成是这样的：
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```
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<设备名>/<路径名>
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```
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在open调用里面有一个`get_index`(kernel/vfs.c:175), 它会自动把第一个`/`前面的部分作为设备名，然后在文件系统的描述符表中去匹配。然后返回设备编号。同时还会更新原来传进去的路径名，把前面的设备名称和`/`给去掉，取后面的路径名。这个东西写的真的很奇怪。。。由于它意义不明的代码，对于没有`/`存在的路径名，他的设备名就是路径名。
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对于字节设备而言，open/close/read/lseek/unlink貌似都是直接转发到`real_<operation>`(kernel/fs.c)里面，也就是在初始化的时候给进去的函数指针。open/unlink有一个处理设备名的过程，这个设计可以说是很智障了。write操作有些许不同，他是将字节划分成512字节的小块写入设备，不过他的实现好想，有点小问题。。。
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tty设备占据vfs表的前三项，分别对应tty0-2，然后每个设备都会分配一个超级块superblock，不过这三个设备的操作都是一样的。
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在文件系统初始化的时候，会专门给tty分配inode，然后把inode的`start_sect`设置为`(DEV_CHAR_TTY<<8)|<tty_id>`，后面就用这个来确定tty号；然后还会特地设置他的inode_nr以便后面匹配inode。然后在open的时候，首先根据路径名，从root inode开始匹配inode的名字，然后返回一个inode_nr（可以看做是inode指针）；会根据设备和inode_nr来获取最终的inode，最后塞进文件描述符表中。
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真正调用tty的地方是在kernel/fs.c:do_rdwt，他会判断出打开的设备是啥，然后调用`tty_read/write`来进行实际的读写。
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## 键盘和tty
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