選択できるのは25トピックまでです。
トピックは、先頭が英数字で、英数字とダッシュ('-')を使用した35文字以内のものにしてください。
466 行
13 KiB
466 行
13 KiB
#include <defs.h>
|
|
#include <x86.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <kbdreg.h>
|
|
#include <picirq.h>
|
|
#include <trap.h>
|
|
|
|
/* stupid I/O delay routine necessitated by historical PC design flaws */
|
|
static void
|
|
delay(void) {
|
|
inb(0x84);
|
|
inb(0x84);
|
|
inb(0x84);
|
|
inb(0x84);
|
|
}
|
|
|
|
/***** Serial I/O code *****/
|
|
#define COM1 0x3F8
|
|
|
|
#define COM_RX 0 // In: Receive buffer (DLAB=0)
|
|
#define COM_TX 0 // Out: Transmit buffer (DLAB=0)
|
|
#define COM_DLL 0 // Out: Divisor Latch Low (DLAB=1)
|
|
#define COM_DLM 1 // Out: Divisor Latch High (DLAB=1)
|
|
#define COM_IER 1 // Out: Interrupt Enable Register
|
|
#define COM_IER_RDI 0x01 // Enable receiver data interrupt
|
|
#define COM_IIR 2 // In: Interrupt ID Register
|
|
#define COM_FCR 2 // Out: FIFO Control Register
|
|
#define COM_LCR 3 // Out: Line Control Register
|
|
#define COM_LCR_DLAB 0x80 // Divisor latch access bit
|
|
#define COM_LCR_WLEN8 0x03 // Wordlength: 8 bits
|
|
#define COM_MCR 4 // Out: Modem Control Register
|
|
#define COM_MCR_RTS 0x02 // RTS complement
|
|
#define COM_MCR_DTR 0x01 // DTR complement
|
|
#define COM_MCR_OUT2 0x08 // Out2 complement
|
|
#define COM_LSR 5 // In: Line Status Register
|
|
#define COM_LSR_DATA 0x01 // Data available
|
|
#define COM_LSR_TXRDY 0x20 // Transmit buffer avail
|
|
#define COM_LSR_TSRE 0x40 // Transmitter off
|
|
|
|
#define MONO_BASE 0x3B4
|
|
#define MONO_BUF 0xB0000
|
|
#define CGA_BASE 0x3D4
|
|
#define CGA_BUF 0xB8000
|
|
#define CRT_ROWS 25
|
|
#define CRT_COLS 80
|
|
#define CRT_SIZE (CRT_ROWS * CRT_COLS)
|
|
|
|
#define LPTPORT 0x378
|
|
|
|
static uint16_t *crt_buf;
|
|
static uint16_t crt_pos;
|
|
static uint16_t addr_6845;
|
|
|
|
// 显示器初始化，CGA 是 Color Graphics Adapter 的缩写
|
|
// CGA显存按照下面的方式映射：
|
|
// -- 0xB0000 - 0xB7777 单色字符模式
|
|
// -- 0xB8000 - 0xBFFFF 彩色字符模式及 CGA 兼容图形模式
|
|
// 6845芯片是IBM PC中的视频控制器
|
|
// CPU通过IO地址0x3B4-0x3B5来驱动6845控制单色显示，通过IO地址0x3D4-0x3D5来控制彩色显示。
|
|
// -- 数据寄存器 映射 到 端口 0x3D5或0x3B5
|
|
// -- 索引寄存器 0x3D4或0x3B4,决定在数据寄存器中的数据表示什么。
|
|
|
|
/* TEXT-mode CGA/VGA display output */
|
|
static void
|
|
cga_init(void) {
|
|
volatile uint16_t *cp = (uint16_t *)CGA_BUF; //CGA_BUF: 0xB8000 (彩色显示的显存物理基址)
|
|
uint16_t was = *cp; //保存当前显存0xB8000处的值
|
|
*cp = (uint16_t) 0xA55A; // 给这个地址随便写个值，看看能否再读出同样的值
|
|
if (*cp != 0xA55A) { // 如果读不出来，说明没有这块显存，即是单显配置
|
|
cp = (uint16_t*)MONO_BUF; //设置为单显的显存基址 MONO_BUF： 0xB0000
|
|
addr_6845 = MONO_BASE; //设置为单显控制的IO地址，MONO_BASE: 0x3B4
|
|
} else { // 如果读出来了，有这块显存，即是彩显配置
|
|
*cp = was; //还原原来显存位置的值
|
|
addr_6845 = CGA_BASE; // 设置为彩显控制的IO地址，CGA_BASE: 0x3D4
|
|
}
|
|
|
|
// Extract cursor location
|
|
// 6845索引寄存器的index 0x0E（及十进制的14）== 光标位置(高位)
|
|
// 6845索引寄存器的index 0x0F（及十进制的15）== 光标位置(低位)
|
|
// 6845 reg 15 : Cursor Address (Low Byte)
|
|
uint32_t pos;
|
|
outb(addr_6845, 14);
|
|
pos = inb(addr_6845 + 1) << 8; //读出了光标位置(高位)
|
|
outb(addr_6845, 15);
|
|
pos |= inb(addr_6845 + 1); //读出了光标位置(低位)
|
|
|
|
crt_buf = (uint16_t*) cp; //crt_buf是CGA显存起始地址
|
|
crt_pos = pos; //crt_pos是CGA当前光标位置
|
|
}
|
|
|
|
static bool serial_exists = 0;
|
|
|
|
static void
|
|
serial_init(void) {
|
|
// Turn off the FIFO
|
|
outb(COM1 + COM_FCR, 0);
|
|
|
|
// Set speed; requires DLAB latch
|
|
outb(COM1 + COM_LCR, COM_LCR_DLAB);
|
|
outb(COM1 + COM_DLL, (uint8_t) (115200 / 9600));
|
|
outb(COM1 + COM_DLM, 0);
|
|
|
|
// 8 data bits, 1 stop bit, parity off; turn off DLAB latch
|
|
outb(COM1 + COM_LCR, COM_LCR_WLEN8 & ~COM_LCR_DLAB);
|
|
|
|
// No modem controls
|
|
outb(COM1 + COM_MCR, 0);
|
|
// Enable rcv interrupts
|
|
outb(COM1 + COM_IER, COM_IER_RDI);
|
|
|
|
// Clear any preexisting overrun indications and interrupts
|
|
// Serial port doesn't exist if COM_LSR returns 0xFF
|
|
serial_exists = (inb(COM1 + COM_LSR) != 0xFF);
|
|
(void) inb(COM1+COM_IIR);
|
|
(void) inb(COM1+COM_RX);
|
|
|
|
if (serial_exists) {
|
|
pic_enable(IRQ_COM1);
|
|
}
|
|
}
|
|
|
|
static void
|
|
lpt_putc_sub(int c) {
|
|
int i;
|
|
for (i = 0; !(inb(LPTPORT + 1) & 0x80) && i < 12800; i ++) {
|
|
delay();
|
|
}
|
|
outb(LPTPORT + 0, c);
|
|
outb(LPTPORT + 2, 0x08 | 0x04 | 0x01);
|
|
outb(LPTPORT + 2, 0x08);
|
|
}
|
|
|
|
/* lpt_putc - copy console output to parallel port */
|
|
static void
|
|
lpt_putc(int c) {
|
|
if (c != '\b') {
|
|
lpt_putc_sub(c);
|
|
}
|
|
else {
|
|
lpt_putc_sub('\b');
|
|
lpt_putc_sub(' ');
|
|
lpt_putc_sub('\b');
|
|
}
|
|
}
|
|
|
|
/* cga_putc - print character to console */
|
|
static void
|
|
cga_putc(int c) {
|
|
// set black on white
|
|
if (!(c & ~0xFF)) {
|
|
c |= 0x0700;
|
|
}
|
|
|
|
switch (c & 0xff) {
|
|
case '\b':
|
|
if (crt_pos > 0) {
|
|
crt_pos --;
|
|
crt_buf[crt_pos] = (c & ~0xff) | ' ';
|
|
}
|
|
break;
|
|
case '\n':
|
|
crt_pos += CRT_COLS;
|
|
case '\r':
|
|
crt_pos -= (crt_pos % CRT_COLS);
|
|
break;
|
|
default:
|
|
crt_buf[crt_pos ++] = c; // write the character
|
|
break;
|
|
}
|
|
|
|
// What is the purpose of this?
|
|
if (crt_pos >= CRT_SIZE) {
|
|
int i;
|
|
memmove(crt_buf, crt_buf + CRT_COLS, (CRT_SIZE - CRT_COLS) * sizeof(uint16_t));
|
|
for (i = CRT_SIZE - CRT_COLS; i < CRT_SIZE; i ++) {
|
|
crt_buf[i] = 0x0700 | ' ';
|
|
}
|
|
crt_pos -= CRT_COLS;
|
|
}
|
|
|
|
// move that little blinky thing
|
|
outb(addr_6845, 14);
|
|
outb(addr_6845 + 1, crt_pos >> 8);
|
|
outb(addr_6845, 15);
|
|
outb(addr_6845 + 1, crt_pos);
|
|
}
|
|
|
|
static void
|
|
serial_putc_sub(int c) {
|
|
int i;
|
|
for (i = 0; !(inb(COM1 + COM_LSR) & COM_LSR_TXRDY) && i < 12800; i ++) {
|
|
delay();
|
|
}
|
|
outb(COM1 + COM_TX, c);
|
|
}
|
|
|
|
/* serial_putc - print character to serial port */
|
|
static void
|
|
serial_putc(int c) {
|
|
if (c != '\b') {
|
|
serial_putc_sub(c);
|
|
}
|
|
else {
|
|
serial_putc_sub('\b');
|
|
serial_putc_sub(' ');
|
|
serial_putc_sub('\b');
|
|
}
|
|
}
|
|
|
|
/* *
|
|
* Here we manage the console input buffer, where we stash characters
|
|
* received from the keyboard or serial port whenever the corresponding
|
|
* interrupt occurs.
|
|
* */
|
|
|
|
#define CONSBUFSIZE 512
|
|
|
|
static struct {
|
|
uint8_t buf[CONSBUFSIZE];
|
|
uint32_t rpos;
|
|
uint32_t wpos;
|
|
} cons;
|
|
|
|
/* *
|
|
* cons_intr - called by device interrupt routines to feed input
|
|
* characters into the circular console input buffer.
|
|
* */
|
|
static void
|
|
cons_intr(int (*proc)(void)) {
|
|
int c;
|
|
while ((c = (*proc)()) != -1) {
|
|
if (c != 0) {
|
|
cons.buf[cons.wpos ++] = c;
|
|
if (cons.wpos == CONSBUFSIZE) {
|
|
cons.wpos = 0;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* serial_proc_data - get data from serial port */
|
|
static int
|
|
serial_proc_data(void) {
|
|
if (!(inb(COM1 + COM_LSR) & COM_LSR_DATA)) {
|
|
return -1;
|
|
}
|
|
int c = inb(COM1 + COM_RX);
|
|
if (c == 127) {
|
|
c = '\b';
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/* serial_intr - try to feed input characters from serial port */
|
|
void
|
|
serial_intr(void) {
|
|
if (serial_exists) {
|
|
cons_intr(serial_proc_data);
|
|
}
|
|
}
|
|
|
|
/***** Keyboard input code *****/
|
|
|
|
#define NO 0
|
|
|
|
#define SHIFT (1<<0)
|
|
#define CTL (1<<1)
|
|
#define ALT (1<<2)
|
|
|
|
#define CAPSLOCK (1<<3)
|
|
#define NUMLOCK (1<<4)
|
|
#define SCROLLLOCK (1<<5)
|
|
|
|
#define E0ESC (1<<6)
|
|
|
|
static uint8_t shiftcode[256] = {
|
|
[0x1D] CTL,
|
|
[0x2A] SHIFT,
|
|
[0x36] SHIFT,
|
|
[0x38] ALT,
|
|
[0x9D] CTL,
|
|
[0xB8] ALT
|
|
};
|
|
|
|
static uint8_t togglecode[256] = {
|
|
[0x3A] CAPSLOCK,
|
|
[0x45] NUMLOCK,
|
|
[0x46] SCROLLLOCK
|
|
};
|
|
|
|
static uint8_t normalmap[256] = {
|
|
NO, 0x1B, '1', '2', '3', '4', '5', '6', // 0x00
|
|
'7', '8', '9', '0', '-', '=', '\b', '\t',
|
|
'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', // 0x10
|
|
'o', 'p', '[', ']', '\n', NO, 'a', 's',
|
|
'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', // 0x20
|
|
'\'', '`', NO, '\\', 'z', 'x', 'c', 'v',
|
|
'b', 'n', 'm', ',', '.', '/', NO, '*', // 0x30
|
|
NO, ' ', NO, NO, NO, NO, NO, NO,
|
|
NO, NO, NO, NO, NO, NO, NO, '7', // 0x40
|
|
'8', '9', '-', '4', '5', '6', '+', '1',
|
|
'2', '3', '0', '.', NO, NO, NO, NO, // 0x50
|
|
[0xC7] KEY_HOME, [0x9C] '\n' /*KP_Enter*/,
|
|
[0xB5] '/' /*KP_Div*/, [0xC8] KEY_UP,
|
|
[0xC9] KEY_PGUP, [0xCB] KEY_LF,
|
|
[0xCD] KEY_RT, [0xCF] KEY_END,
|
|
[0xD0] KEY_DN, [0xD1] KEY_PGDN,
|
|
[0xD2] KEY_INS, [0xD3] KEY_DEL
|
|
};
|
|
|
|
static uint8_t shiftmap[256] = {
|
|
NO, 033, '!', '@', '#', '$', '%', '^', // 0x00
|
|
'&', '*', '(', ')', '_', '+', '\b', '\t',
|
|
'Q', 'W', 'E', 'R', 'T', 'Y', 'U', 'I', // 0x10
|
|
'O', 'P', '{', '}', '\n', NO, 'A', 'S',
|
|
'D', 'F', 'G', 'H', 'J', 'K', 'L', ':', // 0x20
|
|
'"', '~', NO, '|', 'Z', 'X', 'C', 'V',
|
|
'B', 'N', 'M', '<', '>', '?', NO, '*', // 0x30
|
|
NO, ' ', NO, NO, NO, NO, NO, NO,
|
|
NO, NO, NO, NO, NO, NO, NO, '7', // 0x40
|
|
'8', '9', '-', '4', '5', '6', '+', '1',
|
|
'2', '3', '0', '.', NO, NO, NO, NO, // 0x50
|
|
[0xC7] KEY_HOME, [0x9C] '\n' /*KP_Enter*/,
|
|
[0xB5] '/' /*KP_Div*/, [0xC8] KEY_UP,
|
|
[0xC9] KEY_PGUP, [0xCB] KEY_LF,
|
|
[0xCD] KEY_RT, [0xCF] KEY_END,
|
|
[0xD0] KEY_DN, [0xD1] KEY_PGDN,
|
|
[0xD2] KEY_INS, [0xD3] KEY_DEL
|
|
};
|
|
|
|
#define C(x) (x - '@')
|
|
|
|
static uint8_t ctlmap[256] = {
|
|
NO, NO, NO, NO, NO, NO, NO, NO,
|
|
NO, NO, NO, NO, NO, NO, NO, NO,
|
|
C('Q'), C('W'), C('E'), C('R'), C('T'), C('Y'), C('U'), C('I'),
|
|
C('O'), C('P'), NO, NO, '\r', NO, C('A'), C('S'),
|
|
C('D'), C('F'), C('G'), C('H'), C('J'), C('K'), C('L'), NO,
|
|
NO, NO, NO, C('\\'), C('Z'), C('X'), C('C'), C('V'),
|
|
C('B'), C('N'), C('M'), NO, NO, C('/'), NO, NO,
|
|
[0x97] KEY_HOME,
|
|
[0xB5] C('/'), [0xC8] KEY_UP,
|
|
[0xC9] KEY_PGUP, [0xCB] KEY_LF,
|
|
[0xCD] KEY_RT, [0xCF] KEY_END,
|
|
[0xD0] KEY_DN, [0xD1] KEY_PGDN,
|
|
[0xD2] KEY_INS, [0xD3] KEY_DEL
|
|
};
|
|
|
|
static uint8_t *charcode[4] = {
|
|
normalmap,
|
|
shiftmap,
|
|
ctlmap,
|
|
ctlmap
|
|
};
|
|
|
|
/* *
|
|
* kbd_proc_data - get data from keyboard
|
|
*
|
|
* The kbd_proc_data() function gets data from the keyboard.
|
|
* If we finish a character, return it, else 0. And return -1 if no data.
|
|
* */
|
|
static int
|
|
kbd_proc_data(void) {
|
|
int c;
|
|
uint8_t data;
|
|
static uint32_t shift;
|
|
|
|
if ((inb(KBSTATP) & KBS_DIB) == 0) {
|
|
return -1;
|
|
}
|
|
|
|
data = inb(KBDATAP);
|
|
|
|
if (data == 0xE0) {
|
|
// E0 escape character
|
|
shift |= E0ESC;
|
|
return 0;
|
|
} else if (data & 0x80) {
|
|
// Key released
|
|
data = (shift & E0ESC ? data : data & 0x7F);
|
|
shift &= ~(shiftcode[data] | E0ESC);
|
|
return 0;
|
|
} else if (shift & E0ESC) {
|
|
// Last character was an E0 escape; or with 0x80
|
|
data |= 0x80;
|
|
shift &= ~E0ESC;
|
|
}
|
|
|
|
shift |= shiftcode[data];
|
|
shift ^= togglecode[data];
|
|
|
|
c = charcode[shift & (CTL | SHIFT)][data];
|
|
if (shift & CAPSLOCK) {
|
|
if ('a' <= c && c <= 'z')
|
|
c += 'A' - 'a';
|
|
else if ('A' <= c && c <= 'Z')
|
|
c += 'a' - 'A';
|
|
}
|
|
|
|
// Process special keys
|
|
// Ctrl-Alt-Del: reboot
|
|
if (!(~shift & (CTL | ALT)) && c == KEY_DEL) {
|
|
cprintf("Rebooting!\n");
|
|
outb(0x92, 0x3); // courtesy of Chris Frost
|
|
}
|
|
return c;
|
|
}
|
|
|
|
/* kbd_intr - try to feed input characters from keyboard */
|
|
static void
|
|
kbd_intr(void) {
|
|
cons_intr(kbd_proc_data);
|
|
}
|
|
|
|
static void
|
|
kbd_init(void) {
|
|
// drain the kbd buffer
|
|
kbd_intr();
|
|
pic_enable(IRQ_KBD);
|
|
}
|
|
|
|
/* cons_init - initializes the console devices */
|
|
void
|
|
cons_init(void) {
|
|
cga_init();
|
|
serial_init();
|
|
kbd_init();
|
|
if (!serial_exists) {
|
|
cprintf("serial port does not exist!!\n");
|
|
}
|
|
}
|
|
|
|
/* cons_putc - print a single character @c to console devices */
|
|
void
|
|
cons_putc(int c) {
|
|
lpt_putc(c);
|
|
cga_putc(c);
|
|
serial_putc(c);
|
|
}
|
|
|
|
/* *
|
|
* cons_getc - return the next input character from console,
|
|
* or 0 if none waiting.
|
|
* */
|
|
int
|
|
cons_getc(void) {
|
|
int c;
|
|
|
|
// poll for any pending input characters,
|
|
// so that this function works even when interrupts are disabled
|
|
// (e.g., when called from the kernel monitor).
|
|
serial_intr();
|
|
kbd_intr();
|
|
|
|
// grab the next character from the input buffer.
|
|
if (cons.rpos != cons.wpos) {
|
|
c = cons.buf[cons.rpos ++];
|
|
if (cons.rpos == CONSBUFSIZE) {
|
|
cons.rpos = 0;
|
|
}
|
|
return c;
|
|
}
|
|
return 0;
|
|
}
|
|
|