hw/pckbd.c

   1 /*
   2  * QEMU PC keyboard emulation
   3  *
   4  * Copyright (c) 2003 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "hw.h"
  25 #include "isa.h"
  26 #include "pc.h"
  27 #include "ps2.h"
  28 #include "sysemu.h"
  29
  30 /* debug PC keyboard */
  31 //#define DEBUG_KBD
  32
  33 /*      Keyboard Controller Commands */
  34 #define KBD_CCMD_READ_MODE      0x20    /* Read mode bits */
  35 #define KBD_CCMD_WRITE_MODE     0x60    /* Write mode bits */
  36 #define KBD_CCMD_GET_VERSION    0xA1    /* Get controller version */
  37 #define KBD_CCMD_MOUSE_DISABLE  0xA7    /* Disable mouse interface */
  38 #define KBD_CCMD_MOUSE_ENABLE   0xA8    /* Enable mouse interface */
  39 #define KBD_CCMD_TEST_MOUSE     0xA9    /* Mouse interface test */
  40 #define KBD_CCMD_SELF_TEST      0xAA    /* Controller self test */
  41 #define KBD_CCMD_KBD_TEST       0xAB    /* Keyboard interface test */
  42 #define KBD_CCMD_KBD_DISABLE    0xAD    /* Keyboard interface disable */
  43 #define KBD_CCMD_KBD_ENABLE     0xAE    /* Keyboard interface enable */
  44 #define KBD_CCMD_READ_INPORT    0xC0    /* read input port */
  45 #define KBD_CCMD_READ_OUTPORT   0xD0    /* read output port */
  46 #define KBD_CCMD_WRITE_OUTPORT  0xD1    /* write output port */
  47 #define KBD_CCMD_WRITE_OBUF     0xD2
  48 #define KBD_CCMD_WRITE_AUX_OBUF 0xD3    /* Write to output buffer as if
  49                                            initiated by the auxiliary device */
  50 #define KBD_CCMD_WRITE_MOUSE    0xD4    /* Write the following byte to the mouse */
  51 #define KBD_CCMD_DISABLE_A20    0xDD    /* HP vectra only ? */
  52 #define KBD_CCMD_ENABLE_A20     0xDF    /* HP vectra only ? */
  53 #define KBD_CCMD_RESET          0xFE
  54
  55 /* Keyboard Commands */
  56 #define KBD_CMD_SET_LEDS        0xED    /* Set keyboard leds */
  57 #define KBD_CMD_ECHO            0xEE
  58 #define KBD_CMD_GET_ID          0xF2    /* get keyboard ID */
  59 #define KBD_CMD_SET_RATE        0xF3    /* Set typematic rate */
  60 #define KBD_CMD_ENABLE          0xF4    /* Enable scanning */
  61 #define KBD_CMD_RESET_DISABLE   0xF5    /* reset and disable scanning */
  62 #define KBD_CMD_RESET_ENABLE    0xF6    /* reset and enable scanning */
  63 #define KBD_CMD_RESET           0xFF    /* Reset */
  64
  65 /* Keyboard Replies */
  66 #define KBD_REPLY_POR           0xAA    /* Power on reset */
  67 #define KBD_REPLY_ACK           0xFA    /* Command ACK */
  68 #define KBD_REPLY_RESEND        0xFE    /* Command NACK, send the cmd again */
  69
  70 /* Status Register Bits */
  71 #define KBD_STAT_OBF            0x01    /* Keyboard output buffer full */
  72 #define KBD_STAT_IBF            0x02    /* Keyboard input buffer full */
  73 #define KBD_STAT_SELFTEST       0x04    /* Self test successful */
  74 #define KBD_STAT_CMD            0x08    /* Last write was a command write (0=data) */
  75 #define KBD_STAT_UNLOCKED       0x10    /* Zero if keyboard locked */
  76 #define KBD_STAT_MOUSE_OBF      0x20    /* Mouse output buffer full */
  77 #define KBD_STAT_GTO            0x40    /* General receive/xmit timeout */
  78 #define KBD_STAT_PERR           0x80    /* Parity error */
  79
  80 /* Controller Mode Register Bits */
  81 #define KBD_MODE_KBD_INT        0x01    /* Keyboard data generate IRQ1 */
  82 #define KBD_MODE_MOUSE_INT      0x02    /* Mouse data generate IRQ12 */
  83 #define KBD_MODE_SYS            0x04    /* The system flag (?) */
  84 #define KBD_MODE_NO_KEYLOCK     0x08    /* The keylock doesn't affect the keyboard if set */
  85 #define KBD_MODE_DISABLE_KBD    0x10    /* Disable keyboard interface */
  86 #define KBD_MODE_DISABLE_MOUSE  0x20    /* Disable mouse interface */
  87 #define KBD_MODE_KCC            0x40    /* Scan code conversion to PC format */
  88 #define KBD_MODE_RFU            0x80
  89
  90 /* Mouse Commands */
  91 #define AUX_SET_SCALE11         0xE6    /* Set 1:1 scaling */
  92 #define AUX_SET_SCALE21         0xE7    /* Set 2:1 scaling */
  93 #define AUX_SET_RES             0xE8    /* Set resolution */
  94 #define AUX_GET_SCALE           0xE9    /* Get scaling factor */
  95 #define AUX_SET_STREAM          0xEA    /* Set stream mode */
  96 #define AUX_POLL                0xEB    /* Poll */
  97 #define AUX_RESET_WRAP          0xEC    /* Reset wrap mode */
  98 #define AUX_SET_WRAP            0xEE    /* Set wrap mode */
  99 #define AUX_SET_REMOTE          0xF0    /* Set remote mode */
 100 #define AUX_GET_TYPE            0xF2    /* Get type */
 101 #define AUX_SET_SAMPLE          0xF3    /* Set sample rate */
 102 #define AUX_ENABLE_DEV          0xF4    /* Enable aux device */
 103 #define AUX_DISABLE_DEV         0xF5    /* Disable aux device */
 104 #define AUX_SET_DEFAULT         0xF6
 105 #define AUX_RESET               0xFF    /* Reset aux device */
 106 #define AUX_ACK                 0xFA    /* Command byte ACK. */
 107
 108 #define MOUSE_STATUS_REMOTE     0x40
 109 #define MOUSE_STATUS_ENABLED    0x20
 110 #define MOUSE_STATUS_SCALE21    0x10
 111
 112 #define KBD_PENDING_KBD         1
 113 #define KBD_PENDING_AUX         2
 114
 115 typedef struct KBDState {
 116     uint8_t write_cmd; /* if non zero, write data to port 60 is expected */
 117     uint8_t status;
 118     uint8_t mode;
 119     /* Bitmask of devices with data available.  */
 120     uint8_t pending;
 121     void *kbd;
 122     void *mouse;
 123
 124     qemu_irq irq_kbd;
 125     qemu_irq irq_mouse;
 126     target_phys_addr_t mask;
 127 } KBDState;
 128
 129 static KBDState kbd_state;
 130
 131 /* update irq and KBD_STAT_[MOUSE_]OBF */
 132 /* XXX: not generating the irqs if KBD_MODE_DISABLE_KBD is set may be
 133    incorrect, but it avoids having to simulate exact delays */
 134 static void kbd_update_irq(KBDState *s)
 135 {
 136     int irq_kbd_level, irq_mouse_level;
 137
 138     irq_kbd_level = 0;
 139     irq_mouse_level = 0;
 140     s->status &= ~(KBD_STAT_OBF | KBD_STAT_MOUSE_OBF);
 141     if (s->pending) {
 142         s->status |= KBD_STAT_OBF;
 143         /* kbd data takes priority over aux data.  */
 144         if (s->pending == KBD_PENDING_AUX) {
 145             s->status |= KBD_STAT_MOUSE_OBF;
 146             if (s->mode & KBD_MODE_MOUSE_INT)
 147                 irq_mouse_level = 1;
 148         } else {
 149             if ((s->mode & KBD_MODE_KBD_INT) &&
 150                 !(s->mode & KBD_MODE_DISABLE_KBD))
 151                 irq_kbd_level = 1;
 152         }
 153     }
 154     qemu_set_irq(s->irq_kbd, irq_kbd_level);
 155     qemu_set_irq(s->irq_mouse, irq_mouse_level);
 156 }
 157
 158 static void kbd_update_kbd_irq(void *opaque, int level)
 159 {
 160     KBDState *s = (KBDState *)opaque;
 161
 162     if (level)
 163         s->pending |= KBD_PENDING_KBD;
 164     else
 165         s->pending &= ~KBD_PENDING_KBD;
 166     kbd_update_irq(s);
 167 }
 168
 169 static void kbd_update_aux_irq(void *opaque, int level)
 170 {
 171     KBDState *s = (KBDState *)opaque;
 172
 173     if (level)
 174         s->pending |= KBD_PENDING_AUX;
 175     else
 176         s->pending &= ~KBD_PENDING_AUX;
 177     kbd_update_irq(s);
 178 }
 179
 180 static uint32_t kbd_read_status(void *opaque, uint32_t addr)
 181 {
 182     KBDState *s = opaque;
 183     int val;
 184     val = s->status;
 185 #if defined(DEBUG_KBD)
 186     printf("kbd: read status=0x%02x\n", val);
 187 #endif
 188     return val;
 189 }
 190
 191 static void kbd_queue(KBDState *s, int b, int aux)
 192 {
 193     if (aux)
 194         ps2_queue(s->mouse, b);
 195     else
 196         ps2_queue(s->kbd, b);
 197 }
 198
 199 static void kbd_write_command(void *opaque, uint32_t addr, uint32_t val)
 200 {
 201     KBDState *s = opaque;
 202
 203 #ifdef DEBUG_KBD
 204     printf("kbd: write cmd=0x%02x\n", val);
 205 #endif
 206     switch(val) {
 207     case KBD_CCMD_READ_MODE:
 208         kbd_queue(s, s->mode, 0);
 209         break;
 210     case KBD_CCMD_WRITE_MODE:
 211     case KBD_CCMD_WRITE_OBUF:
 212     case KBD_CCMD_WRITE_AUX_OBUF:
 213     case KBD_CCMD_WRITE_MOUSE:
 214     case KBD_CCMD_WRITE_OUTPORT:
 215         s->write_cmd = val;
 216         break;
 217     case KBD_CCMD_MOUSE_DISABLE:
 218         s->mode |= KBD_MODE_DISABLE_MOUSE;
 219         break;
 220     case KBD_CCMD_MOUSE_ENABLE:
 221         s->mode &= ~KBD_MODE_DISABLE_MOUSE;
 222         break;
 223     case KBD_CCMD_TEST_MOUSE:
 224         kbd_queue(s, 0x00, 0);
 225         break;
 226     case KBD_CCMD_SELF_TEST:
 227         s->status |= KBD_STAT_SELFTEST;
 228         kbd_queue(s, 0x55, 0);
 229         break;
 230     case KBD_CCMD_KBD_TEST:
 231         kbd_queue(s, 0x00, 0);
 232         break;
 233     case KBD_CCMD_KBD_DISABLE:
 234         s->mode |= KBD_MODE_DISABLE_KBD;
 235         kbd_update_irq(s);
 236         break;
 237     case KBD_CCMD_KBD_ENABLE:
 238         s->mode &= ~KBD_MODE_DISABLE_KBD;
 239         kbd_update_irq(s);
 240         break;
 241     case KBD_CCMD_READ_INPORT:
 242         kbd_queue(s, 0x00, 0);
 243         break;
 244     case KBD_CCMD_READ_OUTPORT:
 245         /* XXX: check that */
 246 #ifdef TARGET_I386
 247         val = 0x01 | (ioport_get_a20() << 1);
 248 #else
 249         val = 0x01;
 250 #endif
 251         if (s->status & KBD_STAT_OBF)
 252             val |= 0x10;
 253         if (s->status & KBD_STAT_MOUSE_OBF)
 254             val |= 0x20;
 255         kbd_queue(s, val, 0);
 256         break;
 257 #ifdef TARGET_I386
 258     case KBD_CCMD_ENABLE_A20:
 259         ioport_set_a20(1);
 260         break;
 261     case KBD_CCMD_DISABLE_A20:
 262         ioport_set_a20(0);
 263         break;
 264 #endif
 265     case KBD_CCMD_RESET:
 266         qemu_system_reset_request();
 267         break;
 268     case 0xff:
 269         /* ignore that - I don't know what is its use */
 270         break;
 271     default:
 272         fprintf(stderr, "qemu: unsupported keyboard cmd=0x%02x\n", val);
 273         break;
 274     }
 275 }
 276
 277 static uint32_t kbd_read_data(void *opaque, uint32_t addr)
 278 {
 279     KBDState *s = opaque;
 280     uint32_t val;
 281
 282     if (s->pending == KBD_PENDING_AUX)
 283         val = ps2_read_data(s->mouse);
 284     else
 285         val = ps2_read_data(s->kbd);
 286
 287 #if defined(DEBUG_KBD)
 288     printf("kbd: read data=0x%02x\n", val);
 289 #endif
 290     return val;
 291 }
 292
 293 static void kbd_write_data(void *opaque, uint32_t addr, uint32_t val)
 294 {
 295     KBDState *s = opaque;
 296
 297 #ifdef DEBUG_KBD
 298     printf("kbd: write data=0x%02x\n", val);
 299 #endif
 300
 301     switch(s->write_cmd) {
 302     case 0:
 303         ps2_write_keyboard(s->kbd, val);
 304         break;
 305     case KBD_CCMD_WRITE_MODE:
 306         s->mode = val;
 307         ps2_keyboard_set_translation(s->kbd, (s->mode & KBD_MODE_KCC) != 0);
 308         /* ??? */
 309         kbd_update_irq(s);
 310         break;
 311     case KBD_CCMD_WRITE_OBUF:
 312         kbd_queue(s, val, 0);
 313         break;
 314     case KBD_CCMD_WRITE_AUX_OBUF:
 315         kbd_queue(s, val, 1);
 316         break;
 317     case KBD_CCMD_WRITE_OUTPORT:
 318 #ifdef TARGET_I386
 319         ioport_set_a20((val >> 1) & 1);
 320 #endif
 321         if (!(val & 1)) {
 322             qemu_system_reset_request();
 323         }
 324         break;
 325     case KBD_CCMD_WRITE_MOUSE:
 326         ps2_write_mouse(s->mouse, val);
 327         break;
 328     default:
 329         break;
 330     }
 331     s->write_cmd = 0;
 332 }
 333
 334 static void kbd_reset(void *opaque)
 335 {
 336     KBDState *s = opaque;
 337
 338     s->mode = KBD_MODE_KBD_INT | KBD_MODE_MOUSE_INT;
 339     s->status = KBD_STAT_CMD | KBD_STAT_UNLOCKED;
 340 }
 341
 342 static void kbd_save(QEMUFile* f, void* opaque)
 343 {
 344     KBDState *s = (KBDState*)opaque;
 345
 346     qemu_put_8s(f, &s->write_cmd);
 347     qemu_put_8s(f, &s->status);
 348     qemu_put_8s(f, &s->mode);
 349     qemu_put_8s(f, &s->pending);
 350 }
 351
 352 static int kbd_load(QEMUFile* f, void* opaque, int version_id)
 353 {
 354     KBDState *s = (KBDState*)opaque;
 355
 356     if (version_id != 3)
 357         return -EINVAL;
 358     qemu_get_8s(f, &s->write_cmd);
 359     qemu_get_8s(f, &s->status);
 360     qemu_get_8s(f, &s->mode);
 361     qemu_get_8s(f, &s->pending);
 362     return 0;
 363 }
 364
 365 void i8042_init(qemu_irq kbd_irq, qemu_irq mouse_irq, uint32_t io_base)
 366 {
 367     KBDState *s = &kbd_state;
 368
 369     s->irq_kbd = kbd_irq;
 370     s->irq_mouse = mouse_irq;
 371
 372     kbd_reset(s);
 373     register_savevm("pckbd", 0, 3, kbd_save, kbd_load, s);
 374     register_ioport_read(io_base, 1, 1, kbd_read_data, s);
 375     register_ioport_write(io_base, 1, 1, kbd_write_data, s);
 376     register_ioport_read(io_base + 4, 1, 1, kbd_read_status, s);
 377     register_ioport_write(io_base + 4, 1, 1, kbd_write_command, s);
 378
 379     s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
 380     s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
 381 #ifdef TARGET_I386
 382     vmmouse_init(s->mouse);
 383 #endif
 384     qemu_register_reset(kbd_reset, 0, s);
 385 }
 386
 387 /* Memory mapped interface */
 388 static uint32_t kbd_mm_readb (void *opaque, target_phys_addr_t addr)
 389 {
 390     KBDState *s = opaque;
 391
 392     if (addr & s->mask)
 393         return kbd_read_status(s, 0) & 0xff;
 394     else
 395         return kbd_read_data(s, 0) & 0xff;
 396 }
 397
 398 static void kbd_mm_writeb (void *opaque, target_phys_addr_t addr, uint32_t value)
 399 {
 400     KBDState *s = opaque;
 401
 402     if (addr & s->mask)
 403         kbd_write_command(s, 0, value & 0xff);
 404     else
 405         kbd_write_data(s, 0, value & 0xff);
 406 }
 407
 408 static CPUReadMemoryFunc *kbd_mm_read[] = {
 409     &kbd_mm_readb,
 410     &kbd_mm_readb,
 411     &kbd_mm_readb,
 412 };
 413
 414 static CPUWriteMemoryFunc *kbd_mm_write[] = {
 415     &kbd_mm_writeb,
 416     &kbd_mm_writeb,
 417     &kbd_mm_writeb,
 418 };
 419
 420 void i8042_mm_init(qemu_irq kbd_irq, qemu_irq mouse_irq,
 421                    target_phys_addr_t base, ram_addr_t size,
 422                    target_phys_addr_t mask)
 423 {
 424     KBDState *s = &kbd_state;
 425     int s_io_memory;
 426
 427     s->irq_kbd = kbd_irq;
 428     s->irq_mouse = mouse_irq;
 429     s->mask = mask;
 430
 431     kbd_reset(s);
 432     register_savevm("pckbd", 0, 3, kbd_save, kbd_load, s);
 433     s_io_memory = cpu_register_io_memory(0, kbd_mm_read, kbd_mm_write, s);
 434     cpu_register_physical_memory(base, size, s_io_memory);
 435
 436     s->kbd = ps2_kbd_init(kbd_update_kbd_irq, s);
 437     s->mouse = ps2_mouse_init(kbd_update_aux_irq, s);
 438 #ifdef TARGET_I386
 439     vmmouse_init(s->mouse);
 440 #endif
 441     qemu_register_reset(kbd_reset, 0, s);
 442 }