summaryrefslogtreecommitdiff
path: root/console.c
blob: 438e332ea8ebbca5418402b06e5a667c58e3122e (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
#include "types.h"
#include "x86.h"
#include "traps.h"
#include "defs.h"
#include "spinlock.h"
#include "dev.h"
#include "param.h"

struct spinlock console_lock;
int panicked = 0;
int use_console_lock = 0;

/*
 * copy console output to parallel port, which you can tell
 * .bochsrc to copy to the stdout:
 * parport1: enabled=1, file="/dev/stdout"
 */
static void
lpt_putc(int c)
{
	int i;

	for (i = 0; !(inb(0x378+1) & 0x80) && i < 12800; i++)
		;
	outb(0x378+0, c);
	outb(0x378+2, 0x08|0x04|0x01);
	outb(0x378+2, 0x08);
}

static void
cons_putc(int c)
{
  int crtport = 0x3d4; // io port of CGA
  ushort *crt = (ushort *) 0xB8000; // base of CGA memory
  int ind;

  if(panicked){
    cli();
    for(;;)
      ;
  }

  lpt_putc(c);

  // 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++;
  }

  if((ind / 80) >= 24){
    // scroll up
    memmove(crt, crt + 80, sizeof(crt[0]) * (23 * 80));
    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);
}

void
printint(int xx, int base, int sgn)
{
  char buf[16];
  char digits[] = "0123456789ABCDEF";
  int i = 0, neg = 0;
  uint x;
  
  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]);
}

/*
 * print to the console. only understands %d, %x, %p, %s.
 */
void
cprintf(char *fmt, ...)
{
  int i, state = 0, c, locking = 0;
  uint *ap = (uint *)(void*)&fmt + 1;

  if(use_console_lock){
    locking = 1;
    acquire(&console_lock);
  }

  for(i = 0; fmt[i]; i++){
    c = fmt[i] & 0xff;
    if(state == 0){
      if(c == '%'){
        state = '%';
      } else {
        cons_putc(c);
      }
    } else if(state == '%'){
      if(c == 'd'){
        printint(*ap, 10, 1);
        ap++;
      } else if(c == 'x' || c == 'p'){
        printint(*ap, 16, 0);
        ap++;
      } else if(c == 's'){
        char *s = (char*)*ap;
        ap++;
        while(*s != 0){
          cons_putc(*s);
          s++;
        }
      } else if(c == '%'){
        cons_putc(c);
      } else {
        // Unknown % sequence.  Print it to draw attention.
        cons_putc('%');
        cons_putc(c);
      }
      state = 0;
    }
  }

  if(locking)
    release(&console_lock);
}

void
panic(char *s)
{
  __asm __volatile("cli");
  use_console_lock = 0;
  cprintf("panic (%d): ", cpu());
  cprintf(s, 0);
  cprintf("\n", 0);
  panicked = 1; // freeze other CPU
  for(;;)
    ;
}

int
console_write (int minor, char *buf, int n)
{
  int i;

  acquire(&console_lock);

  for (i = 0; i < n; i++) {
    cons_putc(buf[i] & 0xff);
  }

  release(&console_lock);

  return n;
}


/* This is i8042reg.h + kbdreg.h from NetBSD. */
#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

static uchar shiftcode[256] = 
{
	[0x1D] CTL,
	[0x2A] SHIFT,
	[0x36] SHIFT,
	[0x38] ALT,
	[0x9D] CTL,
	[0xB8] ALT
};

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
	[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
};

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
	[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 - '@')

static uchar 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 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);
  if ((st & KBS_DIB) == 0){
    release(&kbd_lock);
    return;
  }
  data = inb(KBDATAP);

  if (data == 0xE0) {
    shift |= E0ESC;
    release(&kbd_lock);
    return;
  } else if (data & 0x80) {
    // Key released
    data = (shift & E0ESC ? data : data & 0x7F);
    shift &= ~(shiftcode[data] | E0ESC);
    release(&kbd_lock);
    return;
  } 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';
  }

  // xxx hack
  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");

  devsw[CONSOLE].d_write = console_write;
  devsw[CONSOLE].d_read = console_read;

  ioapic_enable (IRQ_KBD, 0);

  use_console_lock = 1;
}