xv6-cs450/console.c

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#include "types.h"
#include "x86.h"
#include "traps.h"
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#include "defs.h"
#include "spinlock.h"
#include "dev.h"
#include "param.h"
struct spinlock console_lock;
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int panicked = 0;
int use_console_lock = 0;
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// Copy console output to parallel port, which you can tell
// .bochsrc to copy to the stdout:
// parport1: enabled=1, file="/dev/stdout"
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static void
lpt_putc(int c)
{
int i;
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for(i = 0; !(inb(0x378+1) & 0x80) && i < 12800; i++)
;
outb(0x378+0, c);
outb(0x378+2, 0x08|0x04|0x01);
outb(0x378+2, 0x08);
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}
static void
cons_putc(int c)
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{
int crtport = 0x3d4; // io port of CGA
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ushort *crt = (ushort*) 0xB8000; // base of CGA memory
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int ind;
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if(panicked){
cli();
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for(;;)
;
}
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lpt_putc(c);
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// cursor position, 16 bits, col + 80*row
outb(crtport, 14);
ind = inb(crtport + 1) << 8;
outb(crtport, 15);
ind |= inb(crtport + 1);
c &= 0xff;
if(c == '\n'){
ind -= (ind % 80);
ind += 80;
} else {
c |= 0x0700; // black on white
crt[ind] = c;
ind++;
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}
if((ind / 80) >= 24){
// scroll up
memmove(crt, crt + 80, sizeof(crt[0]) * (23 * 80));
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ind -= 80;
memset(crt + ind, 0, sizeof(crt[0]) * ((24 * 80) - ind));
}
outb(crtport, 14);
outb(crtport + 1, ind >> 8);
outb(crtport, 15);
outb(crtport + 1, ind);
}
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void
printint(int xx, int base, int sgn)
{
char buf[16];
char digits[] = "0123456789ABCDEF";
int i = 0, neg = 0;
uint x;
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if(sgn && xx < 0){
neg = 1;
x = 0 - xx;
} else {
x = xx;
}
do {
buf[i++] = digits[x % base];
} while((x /= base) != 0);
if(neg)
buf[i++] = '-';
while(--i >= 0)
cons_putc(buf[i]);
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}
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// Print to the console. only understands %d, %x, %p, %s.
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void
cprintf(char *fmt, ...)
{
int i, state = 0, c, locking = 0;
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uint *ap = (uint*)(void*)&fmt + 1;
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if(use_console_lock){
locking = 1;
acquire(&console_lock);
}
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for(i = 0; fmt[i]; i++){
c = fmt[i] & 0xff;
if(state == 0){
if(c == '%'){
state = '%';
} else {
cons_putc(c);
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}
} else if(state == '%'){
if(c == 'd'){
printint(*ap, 10, 1);
ap++;
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} else if(c == 'x' || c == 'p'){
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printint(*ap, 16, 0);
ap++;
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} else if(c == 's'){
char *s = (char*)*ap;
ap++;
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if(s == 0){
cons_putc('0');
}else{
while(*s != 0){
cons_putc(*s);
s++;
}
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}
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} else if(c == '%'){
cons_putc(c);
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} else {
// Unknown % sequence. Print it to draw attention.
cons_putc('%');
cons_putc(c);
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}
state = 0;
}
}
if(locking)
release(&console_lock);
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}
void
panic(char *s)
{
__asm __volatile("cli");
use_console_lock = 0;
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cprintf("panic (%d): ", cpu());
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cprintf(s, 0);
cprintf("\n", 0);
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panicked = 1; // freeze other CPU
for(;;)
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;
}
int
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console_write(int minor, char *buf, int n)
{
int i;
acquire(&console_lock);
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for(i = 0; i < n; i++) {
cons_putc(buf[i] & 0xff);
}
release(&console_lock);
return n;
}
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#define KBSTATP 0x64 // kbd controller status port(I)
#define KBS_DIB 0x01 // kbd data in buffer
#define KBDATAP 0x60 // kbd data port(I)
#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)
// Special keycodes
#define KEY_HOME 0xE0
#define KEY_END 0xE1
#define KEY_UP 0xE2
#define KEY_DN 0xE3
#define KEY_LF 0xE4
#define KEY_RT 0xE5
#define KEY_PGUP 0xE6
#define KEY_PGDN 0xE7
#define KEY_INS 0xE8
#define KEY_DEL 0xE9
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static uchar shiftcode[256] =
{
[0x1D] CTL,
[0x2A] SHIFT,
[0x36] SHIFT,
[0x38] ALT,
[0x9D] CTL,
[0xB8] ALT
};
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static uchar togglecode[256] =
{
[0x3A] CAPSLOCK,
[0x45] NUMLOCK,
[0x46] SCROLLLOCK
};
static uchar 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
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[0x97] 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
};
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static uchar 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
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[0x97] 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 - '@')
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static uchar ctlmap[256] =
{
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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'),
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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,
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[0xB5] C('/'), // 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 uchar *charcode[4] = {
normalmap,
shiftmap,
ctlmap,
ctlmap
};
#define KBD_BUF 64
char kbd_buf[KBD_BUF];
int kbd_r;
int kbd_w;
struct spinlock kbd_lock;
static uint shift;
void
kbd_intr()
{
uint st, data, c;
acquire(&kbd_lock);
st = inb(KBSTATP);
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if((st & KBS_DIB) == 0){
release(&kbd_lock);
return;
}
data = inb(KBDATAP);
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if(data == 0xE0) {
shift |= E0ESC;
release(&kbd_lock);
return;
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} else if(data & 0x80) {
// Key released
data = (shift & E0ESC ? data : data & 0x7F);
shift &= ~(shiftcode[data] | E0ESC);
release(&kbd_lock);
return;
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} else if(shift & E0ESC) {
// Last character was an E0 escape; or with 0x80
data |= 0x80;
shift &= ~E0ESC;
}
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shift |= shiftcode[data];
shift ^= togglecode[data];
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c = charcode[shift & (CTL | SHIFT)][data];
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if(shift & CAPSLOCK) {
if('a' <= c && c <= 'z')
c += 'A' - 'a';
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else if('A' <= c && c <= 'Z')
c += 'a' - 'A';
}
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// Ignore unknown keystrokes.
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if(c == 0x0) {
release(&kbd_lock);
return;
}
if(((kbd_w + 1) % KBD_BUF) != kbd_r){
kbd_buf[kbd_w++] = c;
if(kbd_w >= KBD_BUF)
kbd_w = 0;
wakeup(&kbd_r);
} else {
cprintf("kbd overflow\n");
}
release(&kbd_lock);
}
int
console_read(int minor, char *dst, int n)
{
uint target = n;
acquire(&kbd_lock);
while(kbd_w == kbd_r) {
sleep(&kbd_r, &kbd_lock);
}
while(n > 0 && kbd_w != kbd_r){
*dst = (kbd_buf[kbd_r]) & 0xff;
cons_putc(*dst & 0xff);
dst++;
--n;
kbd_r++;
if(kbd_r >= KBD_BUF)
kbd_r = 0;
}
release(&kbd_lock);
return target - n;
}
void
console_init()
{
initlock(&console_lock, "console");
initlock(&kbd_lock, "kbd");
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devsw[CONSOLE].write = console_write;
devsw[CONSOLE].read = console_read;
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irq_enable(IRQ_KBD);
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ioapic_enable(IRQ_KBD, 0);
use_console_lock = 1;
}