| 1 |
/* |
| 2 |
* Copyright (C) 2003-2007 Anders Gavare. All rights reserved. |
| 3 |
* |
| 4 |
* Redistribution and use in source and binary forms, with or without |
| 5 |
* modification, are permitted provided that the following conditions are met: |
| 6 |
* |
| 7 |
* 1. Redistributions of source code must retain the above copyright |
| 8 |
* notice, this list of conditions and the following disclaimer. |
| 9 |
* 2. Redistributions in binary form must reproduce the above copyright |
| 10 |
* notice, this list of conditions and the following disclaimer in the |
| 11 |
* documentation and/or other materials provided with the distribution. |
| 12 |
* 3. The name of the author may not be used to endorse or promote products |
| 13 |
* derived from this software without specific prior written permission. |
| 14 |
* |
| 15 |
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 |
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 |
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 |
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 |
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 |
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 |
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 |
* SUCH DAMAGE. |
| 26 |
* |
| 27 |
* |
| 28 |
* $Id: dev_mc146818.c,v 1.95 2007/02/03 16:55:55 debug Exp $ |
| 29 |
* |
| 30 |
* MC146818 real-time clock, used by many different machines types. |
| 31 |
* (DS1687 as used in some other machines is also similar to the MC146818.) |
| 32 |
* |
| 33 |
* This device contains Date/time, the machine's ethernet address (on |
| 34 |
* DECstation 3100), and can cause periodic (hardware) interrupts. |
| 35 |
* |
| 36 |
* NOTE: Many register offsets are multiplied by 4 in this code; this is |
| 37 |
* because I originally wrote it for DECstation 3100 emulation, where the |
| 38 |
* registered are spaced that way. |
| 39 |
*/ |
| 40 |
|
| 41 |
#include <stdio.h> |
| 42 |
#include <stdlib.h> |
| 43 |
#include <string.h> |
| 44 |
#include <time.h> |
| 45 |
|
| 46 |
#include "cpu.h" |
| 47 |
#include "devices.h" |
| 48 |
#include "machine.h" |
| 49 |
#include "memory.h" |
| 50 |
#include "misc.h" |
| 51 |
#include "timer.h" |
| 52 |
|
| 53 |
#include "mc146818reg.h" |
| 54 |
|
| 55 |
|
| 56 |
#define to_bcd(x) ( ((x)/10) * 16 + ((x)%10) ) |
| 57 |
#define from_bcd(x) ( ((x)>>4) * 10 + ((x)&15) ) |
| 58 |
|
| 59 |
/* #define MC146818_DEBUG */ |
| 60 |
|
| 61 |
#define TICK_SHIFT 14 |
| 62 |
|
| 63 |
|
| 64 |
/* 256 on DECstation, SGI uses reg at 72*4 as the Century */ |
| 65 |
#define N_REGISTERS 1024 |
| 66 |
struct mc_data { |
| 67 |
int access_style; |
| 68 |
int last_addr; |
| 69 |
|
| 70 |
int register_choice; |
| 71 |
int reg[N_REGISTERS]; |
| 72 |
int addrdiv; |
| 73 |
|
| 74 |
int use_bcd; |
| 75 |
|
| 76 |
int timebase_hz; |
| 77 |
int interrupt_hz; |
| 78 |
int old_interrupt_hz; |
| 79 |
struct interrupt irq; |
| 80 |
struct timer *timer; |
| 81 |
volatile int pending_timer_interrupts; |
| 82 |
|
| 83 |
int previous_second; |
| 84 |
int n_seconds_elapsed; |
| 85 |
int uip_threshold; |
| 86 |
|
| 87 |
int ugly_netbsd_prep_hack_done; |
| 88 |
int ugly_netbsd_prep_hack_sec; |
| 89 |
}; |
| 90 |
|
| 91 |
|
| 92 |
/* |
| 93 |
* Ugly hack to fool NetBSD/prep to accept the clock. (See mcclock_isa_match |
| 94 |
* in NetBSD's arch/prep/isa/mcclock_isa.c for details.) |
| 95 |
*/ |
| 96 |
#define NETBSD_HACK_INIT 0 |
| 97 |
#define NETBSD_HACK_FIRST_1 1 |
| 98 |
#define NETBSD_HACK_FIRST_2 2 |
| 99 |
#define NETBSD_HACK_SECOND_1 3 |
| 100 |
#define NETBSD_HACK_SECOND_2 4 |
| 101 |
#define NETBSD_HACK_DONE 5 |
| 102 |
|
| 103 |
|
| 104 |
/* |
| 105 |
* timer_tick(): |
| 106 |
* |
| 107 |
* Called d->interrupt_hz times per (real-world) second. |
| 108 |
*/ |
| 109 |
static void timer_tick(struct timer *timer, void *extra) |
| 110 |
{ |
| 111 |
struct mc_data *d = (struct mc_data *) extra; |
| 112 |
d->pending_timer_interrupts ++; |
| 113 |
} |
| 114 |
|
| 115 |
|
| 116 |
DEVICE_TICK(mc146818) |
| 117 |
{ |
| 118 |
struct mc_data *d = extra; |
| 119 |
int pti = d->pending_timer_interrupts; |
| 120 |
|
| 121 |
if ((d->reg[MC_REGB * 4] & MC_REGB_PIE) && pti > 0) { |
| 122 |
static int warned = 0; |
| 123 |
if (pti > 1500 && !warned) { |
| 124 |
warned = 1; |
| 125 |
fatal("[ WARNING: MC146818 interrupts lost, " |
| 126 |
"host too slow? ]\n"); |
| 127 |
} |
| 128 |
|
| 129 |
#if 0 |
| 130 |
/* For debugging, to see how much the interrupts are |
| 131 |
lagging behind the real clock: */ |
| 132 |
{ |
| 133 |
static int x = 0; |
| 134 |
if (++x == 1) { |
| 135 |
x = 0; |
| 136 |
printf("%i ", pti); |
| 137 |
fflush(stdout); |
| 138 |
} |
| 139 |
} |
| 140 |
#endif |
| 141 |
|
| 142 |
INTERRUPT_ASSERT(d->irq); |
| 143 |
|
| 144 |
d->reg[MC_REGC * 4] |= MC_REGC_PF; |
| 145 |
} |
| 146 |
|
| 147 |
if (d->reg[MC_REGC * 4] & MC_REGC_UF || |
| 148 |
d->reg[MC_REGC * 4] & MC_REGC_AF || |
| 149 |
d->reg[MC_REGC * 4] & MC_REGC_PF) |
| 150 |
d->reg[MC_REGC * 4] |= MC_REGC_IRQF; |
| 151 |
} |
| 152 |
|
| 153 |
|
| 154 |
/* |
| 155 |
* dev_mc146818_jazz_access(): |
| 156 |
* |
| 157 |
* It seems like JAZZ machines accesses the mc146818 by writing one byte to |
| 158 |
* 0x90000070 and then reading or writing another byte at 0x......0004000. |
| 159 |
*/ |
| 160 |
int dev_mc146818_jazz_access(struct cpu *cpu, struct memory *mem, |
| 161 |
uint64_t relative_addr, unsigned char *data, size_t len, |
| 162 |
int writeflag, void *extra) |
| 163 |
{ |
| 164 |
struct mc_data *d = extra; |
| 165 |
|
| 166 |
#ifdef MC146818_DEBUG |
| 167 |
if (writeflag == MEM_WRITE) { |
| 168 |
int i; |
| 169 |
fatal("[ mc146818_jazz: write to addr=0x%04x: ", |
| 170 |
(int)relative_addr); |
| 171 |
for (i=0; i<len; i++) |
| 172 |
fatal("%02x ", data[i]); |
| 173 |
fatal("]\n"); |
| 174 |
} else |
| 175 |
fatal("[ mc146818_jazz: read from addr=0x%04x ]\n", |
| 176 |
(int)relative_addr); |
| 177 |
#endif |
| 178 |
|
| 179 |
if (writeflag == MEM_WRITE) { |
| 180 |
d->last_addr = data[0]; |
| 181 |
return 1; |
| 182 |
} else { |
| 183 |
data[0] = d->last_addr; |
| 184 |
return 1; |
| 185 |
} |
| 186 |
} |
| 187 |
|
| 188 |
|
| 189 |
/* |
| 190 |
* mc146818_update_time(): |
| 191 |
* |
| 192 |
* This function updates the MC146818 registers by reading |
| 193 |
* the host's clock. |
| 194 |
*/ |
| 195 |
static void mc146818_update_time(struct mc_data *d) |
| 196 |
{ |
| 197 |
struct tm *tmp; |
| 198 |
time_t timet; |
| 199 |
|
| 200 |
timet = time(NULL); |
| 201 |
tmp = gmtime(&timet); |
| 202 |
|
| 203 |
d->reg[4 * MC_SEC] = tmp->tm_sec; |
| 204 |
d->reg[4 * MC_MIN] = tmp->tm_min; |
| 205 |
d->reg[4 * MC_HOUR] = tmp->tm_hour; |
| 206 |
d->reg[4 * MC_DOW] = tmp->tm_wday + 1; |
| 207 |
d->reg[4 * MC_DOM] = tmp->tm_mday; |
| 208 |
d->reg[4 * MC_MONTH] = tmp->tm_mon + 1; |
| 209 |
d->reg[4 * MC_YEAR] = tmp->tm_year; |
| 210 |
|
| 211 |
/* |
| 212 |
* Special hacks for emulating the behaviour of various machines: |
| 213 |
*/ |
| 214 |
switch (d->access_style) { |
| 215 |
case MC146818_ALGOR: |
| 216 |
/* |
| 217 |
* NetBSD/evbmips sources indicate that the Algor year base |
| 218 |
* is 1920. This makes the time work with NetBSD in Malta |
| 219 |
* emulation. However, for Linux, commenting out this line |
| 220 |
* works better. (TODO: Find a way to make both work?) |
| 221 |
*/ |
| 222 |
d->reg[4 * MC_YEAR] += 80; |
| 223 |
break; |
| 224 |
case MC146818_ARC_NEC: |
| 225 |
d->reg[4 * MC_YEAR] += (0x18 - 104); |
| 226 |
break; |
| 227 |
case MC146818_CATS: |
| 228 |
d->reg[4 * MC_YEAR] %= 100; |
| 229 |
break; |
| 230 |
case MC146818_SGI: |
| 231 |
/* |
| 232 |
* NetBSD/sgimips assumes data in BCD format. |
| 233 |
* Also, IRIX stores the year value in a weird |
| 234 |
* format, according to ../arch/sgimips/sgimips/clockvar.h |
| 235 |
* in NetBSD: |
| 236 |
* |
| 237 |
* "If year < 1985, store (year - 1970), else |
| 238 |
* (year - 1940). This matches IRIX semantics." |
| 239 |
* |
| 240 |
* Another rule: It seems that a real SGI IP32 box |
| 241 |
* uses the value 5 for the year 2005. |
| 242 |
*/ |
| 243 |
d->reg[4 * MC_YEAR] = |
| 244 |
d->reg[4 * MC_YEAR] >= 100 ? |
| 245 |
(d->reg[4 * MC_YEAR] - 100) : |
| 246 |
( |
| 247 |
d->reg[4 * MC_YEAR] < 85 ? |
| 248 |
(d->reg[4 * MC_YEAR] - 30 + 40) |
| 249 |
: (d->reg[4 * MC_YEAR] - 40) |
| 250 |
); |
| 251 |
/* Century: */ |
| 252 |
d->reg[72 * 4] = 19 + (tmp->tm_year / 100); |
| 253 |
break; |
| 254 |
case MC146818_DEC: |
| 255 |
/* |
| 256 |
* DECstations must have 72 or 73 in the |
| 257 |
* Year field, or Ultrix screems. (Weird.) |
| 258 |
*/ |
| 259 |
d->reg[4 * MC_YEAR] = 72; |
| 260 |
|
| 261 |
/* |
| 262 |
* Linux on DECstation stores the year in register 63, |
| 263 |
* but no other DECstation OS does? (Hm.) |
| 264 |
*/ |
| 265 |
d->reg[4 * 63] = tmp->tm_year - 100; |
| 266 |
break; |
| 267 |
} |
| 268 |
|
| 269 |
if (d->use_bcd) { |
| 270 |
d->reg[4 * MC_SEC] = to_bcd(d->reg[4 * MC_SEC]); |
| 271 |
d->reg[4 * MC_MIN] = to_bcd(d->reg[4 * MC_MIN]); |
| 272 |
d->reg[4 * MC_HOUR] = to_bcd(d->reg[4 * MC_HOUR]); |
| 273 |
d->reg[4 * MC_DOW] = to_bcd(d->reg[4 * MC_DOW]); |
| 274 |
d->reg[4 * MC_DOM] = to_bcd(d->reg[4 * MC_DOM]); |
| 275 |
d->reg[4 * MC_MONTH] = to_bcd(d->reg[4 * MC_MONTH]); |
| 276 |
d->reg[4 * MC_YEAR] = to_bcd(d->reg[4 * MC_YEAR]); |
| 277 |
|
| 278 |
/* Used by Linux on DECstation: (Hm) */ |
| 279 |
d->reg[4 * 63] = to_bcd(d->reg[4 * 63]); |
| 280 |
|
| 281 |
/* Used on SGI: */ |
| 282 |
d->reg[4 * 72] = to_bcd(d->reg[4 * 72]); |
| 283 |
} |
| 284 |
} |
| 285 |
|
| 286 |
|
| 287 |
/* |
| 288 |
* dev_mc146818_access(): |
| 289 |
* |
| 290 |
* TODO: This access function only handles 8-bit accesses! |
| 291 |
*/ |
| 292 |
int dev_mc146818_access(struct cpu *cpu, struct memory *mem, |
| 293 |
uint64_t r, unsigned char *data, size_t len, |
| 294 |
int writeflag, void *extra) |
| 295 |
{ |
| 296 |
struct tm *tmp; |
| 297 |
time_t timet; |
| 298 |
struct mc_data *d = extra; |
| 299 |
int relative_addr = r; |
| 300 |
size_t i; |
| 301 |
|
| 302 |
relative_addr /= d->addrdiv; |
| 303 |
|
| 304 |
/* Different ways of accessing the registers: */ |
| 305 |
switch (d->access_style) { |
| 306 |
case MC146818_ALGOR: |
| 307 |
case MC146818_CATS: |
| 308 |
case MC146818_PC_CMOS: |
| 309 |
if ((relative_addr & 1) == 0x00) { |
| 310 |
if (writeflag == MEM_WRITE) { |
| 311 |
d->last_addr = data[0]; |
| 312 |
return 1; |
| 313 |
} else { |
| 314 |
data[0] = d->last_addr; |
| 315 |
return 1; |
| 316 |
} |
| 317 |
} else |
| 318 |
relative_addr = d->last_addr * 4; |
| 319 |
break; |
| 320 |
case MC146818_ARC_NEC: |
| 321 |
if (relative_addr == 0x01) { |
| 322 |
if (writeflag == MEM_WRITE) { |
| 323 |
d->last_addr = data[0]; |
| 324 |
return 1; |
| 325 |
} else { |
| 326 |
data[0] = d->last_addr; |
| 327 |
return 1; |
| 328 |
} |
| 329 |
} else if (relative_addr == 0x00) |
| 330 |
relative_addr = d->last_addr * 4; |
| 331 |
else { |
| 332 |
fatal("[ mc146818: not accessed as an " |
| 333 |
"MC146818_ARC_NEC device! ]\n"); |
| 334 |
} |
| 335 |
break; |
| 336 |
case MC146818_ARC_JAZZ: |
| 337 |
/* See comment for dev_mc146818_jazz_access(). */ |
| 338 |
relative_addr = d->last_addr * 4; |
| 339 |
break; |
| 340 |
case MC146818_DEC: |
| 341 |
case MC146818_SGI: |
| 342 |
/* |
| 343 |
* This device was originally written for DECstation |
| 344 |
* emulation, so no changes are necessary for that access |
| 345 |
* style. |
| 346 |
* |
| 347 |
* SGI access bytes 0x0..0xd at offsets 0x0yz..0xdyz, where yz |
| 348 |
* should be ignored. It works _almost_ as DEC, if offsets are |
| 349 |
* divided by 0x40. |
| 350 |
*/ |
| 351 |
break; |
| 352 |
case MC146818_PMPPC: |
| 353 |
relative_addr *= 4; |
| 354 |
break; |
| 355 |
default: |
| 356 |
; |
| 357 |
} |
| 358 |
|
| 359 |
#ifdef MC146818_DEBUG |
| 360 |
if (writeflag == MEM_WRITE) { |
| 361 |
fatal("[ mc146818: write to addr=0x%04x (len %i): ", |
| 362 |
(int)relative_addr, (int)len); |
| 363 |
for (i=0; i<len; i++) |
| 364 |
fatal("0x%02x ", data[i]); |
| 365 |
fatal("]\n"); |
| 366 |
} |
| 367 |
#endif |
| 368 |
|
| 369 |
/* |
| 370 |
* Sprite seems to wants UF interrupt status, once every second, or |
| 371 |
* it hangs forever during bootup. (These do not cause interrupts, |
| 372 |
* but it is good enough... Sprite polls this, iirc.) |
| 373 |
* |
| 374 |
* Linux on at least sgimips and evbmips (Malta) wants the UIP bit |
| 375 |
* in REGA to be updated once a second. |
| 376 |
*/ |
| 377 |
if (relative_addr == MC_REGA*4 || relative_addr == MC_REGC*4) { |
| 378 |
timet = time(NULL); |
| 379 |
tmp = gmtime(&timet); |
| 380 |
d->reg[MC_REGC * 4] &= ~MC_REGC_UF; |
| 381 |
if (tmp->tm_sec != d->previous_second) { |
| 382 |
d->n_seconds_elapsed ++; |
| 383 |
d->previous_second = tmp->tm_sec; |
| 384 |
} |
| 385 |
if (d->n_seconds_elapsed > d->uip_threshold) { |
| 386 |
d->n_seconds_elapsed = 0; |
| 387 |
|
| 388 |
d->reg[MC_REGA * 4] |= MC_REGA_UIP; |
| 389 |
|
| 390 |
d->reg[MC_REGC * 4] |= MC_REGC_UF; |
| 391 |
d->reg[MC_REGC * 4] |= MC_REGC_IRQF; |
| 392 |
|
| 393 |
/* For some reason, some Linux/DECstation KN04 |
| 394 |
kernels want the PF (periodic flag) bit set, |
| 395 |
even though interrupts are not enabled? */ |
| 396 |
d->reg[MC_REGC * 4] |= MC_REGC_PF; |
| 397 |
} else |
| 398 |
d->reg[MC_REGA * 4] &= ~MC_REGA_UIP; |
| 399 |
} |
| 400 |
|
| 401 |
/* RTC data is in either BCD format or binary: */ |
| 402 |
if (d->use_bcd) |
| 403 |
d->reg[MC_REGB * 4] &= ~(1 << 2); |
| 404 |
else |
| 405 |
d->reg[MC_REGB * 4] |= (1 << 2); |
| 406 |
|
| 407 |
/* RTC date/time is always Valid: */ |
| 408 |
d->reg[MC_REGD * 4] |= MC_REGD_VRT; |
| 409 |
|
| 410 |
if (writeflag == MEM_WRITE) { |
| 411 |
/* WRITE: */ |
| 412 |
switch (relative_addr) { |
| 413 |
case MC_REGA*4: |
| 414 |
if ((data[0] & MC_REGA_DVMASK) == MC_BASE_32_KHz) |
| 415 |
d->timebase_hz = 32000; |
| 416 |
if ((data[0] & MC_REGA_DVMASK) == MC_BASE_1_MHz) |
| 417 |
d->timebase_hz = 1000000; |
| 418 |
if ((data[0] & MC_REGA_DVMASK) == MC_BASE_4_MHz) |
| 419 |
d->timebase_hz = 4000000; |
| 420 |
switch (data[0] & MC_REGA_RSMASK) { |
| 421 |
case MC_RATE_NONE: |
| 422 |
d->interrupt_hz = 0; |
| 423 |
break; |
| 424 |
case MC_RATE_1: |
| 425 |
if (d->timebase_hz == 32000) |
| 426 |
d->interrupt_hz = 256; |
| 427 |
else |
| 428 |
d->interrupt_hz = 32768; |
| 429 |
break; |
| 430 |
case MC_RATE_2: |
| 431 |
if (d->timebase_hz == 32000) |
| 432 |
d->interrupt_hz = 128; |
| 433 |
else |
| 434 |
d->interrupt_hz = 16384; |
| 435 |
break; |
| 436 |
case MC_RATE_8192_Hz: d->interrupt_hz = 8192; break; |
| 437 |
case MC_RATE_4096_Hz: d->interrupt_hz = 4096; break; |
| 438 |
case MC_RATE_2048_Hz: d->interrupt_hz = 2048; break; |
| 439 |
case MC_RATE_1024_Hz: d->interrupt_hz = 1024; break; |
| 440 |
case MC_RATE_512_Hz: d->interrupt_hz = 512; break; |
| 441 |
case MC_RATE_256_Hz: d->interrupt_hz = 256; break; |
| 442 |
case MC_RATE_128_Hz: d->interrupt_hz = 128; break; |
| 443 |
case MC_RATE_64_Hz: d->interrupt_hz = 64; break; |
| 444 |
case MC_RATE_32_Hz: d->interrupt_hz = 32; break; |
| 445 |
case MC_RATE_16_Hz: d->interrupt_hz = 16; break; |
| 446 |
case MC_RATE_8_Hz: d->interrupt_hz = 8; break; |
| 447 |
case MC_RATE_4_Hz: d->interrupt_hz = 4; break; |
| 448 |
case MC_RATE_2_Hz: d->interrupt_hz = 2; break; |
| 449 |
default:/* debug("[ mc146818: unimplemented " |
| 450 |
"MC_REGA RS: %i ]\n", |
| 451 |
data[0] & MC_REGA_RSMASK); */ |
| 452 |
; |
| 453 |
} |
| 454 |
|
| 455 |
if (d->interrupt_hz != d->old_interrupt_hz) { |
| 456 |
debug("[ rtc changed to interrupt at %i Hz ]\n", |
| 457 |
d->interrupt_hz); |
| 458 |
|
| 459 |
d->old_interrupt_hz = d->interrupt_hz; |
| 460 |
|
| 461 |
if (d->timer == NULL) |
| 462 |
d->timer = timer_add(d->interrupt_hz, |
| 463 |
timer_tick, d); |
| 464 |
else |
| 465 |
timer_update_frequency(d->timer, |
| 466 |
d->interrupt_hz); |
| 467 |
} |
| 468 |
|
| 469 |
d->reg[MC_REGA * 4] = |
| 470 |
data[0] & (MC_REGA_RSMASK | MC_REGA_DVMASK); |
| 471 |
break; |
| 472 |
case MC_REGB*4: |
| 473 |
d->reg[MC_REGB*4] = data[0]; |
| 474 |
if (!(data[0] & MC_REGB_PIE)) { |
| 475 |
INTERRUPT_DEASSERT(d->irq); |
| 476 |
} |
| 477 |
|
| 478 |
/* debug("[ mc146818: write to MC_REGB, data[0] " |
| 479 |
"= 0x%02x ]\n", data[0]); */ |
| 480 |
break; |
| 481 |
case MC_REGC*4: |
| 482 |
d->reg[MC_REGC * 4] = data[0]; |
| 483 |
debug("[ mc146818: write to MC_REGC, data[0] = " |
| 484 |
"0x%02x ]\n", data[0]); |
| 485 |
break; |
| 486 |
case 0x128: |
| 487 |
d->reg[relative_addr] = data[0]; |
| 488 |
if (data[0] & 8) { |
| 489 |
int j; |
| 490 |
|
| 491 |
/* Used on SGI to power off the machine. */ |
| 492 |
fatal("[ md146818: power off ]\n"); |
| 493 |
for (j=0; j<cpu->machine->ncpus; j++) |
| 494 |
cpu->machine->cpus[j]->running = 0; |
| 495 |
cpu->machine-> |
| 496 |
exit_without_entering_debugger = 1; |
| 497 |
} |
| 498 |
break; |
| 499 |
default: |
| 500 |
d->reg[relative_addr] = data[0]; |
| 501 |
|
| 502 |
debug("[ mc146818: unimplemented write to " |
| 503 |
"relative_addr = %08lx: ", (long)relative_addr); |
| 504 |
for (i=0; i<len; i++) |
| 505 |
debug("%02x ", data[i]); |
| 506 |
debug("]\n"); |
| 507 |
} |
| 508 |
} else { |
| 509 |
/* READ: */ |
| 510 |
switch (relative_addr) { |
| 511 |
case 0x01: /* Station's ethernet address (6 bytes) */ |
| 512 |
case 0x05: /* (on DECstation 3100) */ |
| 513 |
case 0x09: |
| 514 |
case 0x0d: |
| 515 |
case 0x11: |
| 516 |
case 0x15: |
| 517 |
break; |
| 518 |
case 4 * MC_SEC: |
| 519 |
if (d->ugly_netbsd_prep_hack_done < NETBSD_HACK_DONE) { |
| 520 |
d->ugly_netbsd_prep_hack_done ++; |
| 521 |
switch (d->ugly_netbsd_prep_hack_done) { |
| 522 |
case NETBSD_HACK_FIRST_1: |
| 523 |
d->ugly_netbsd_prep_hack_sec = |
| 524 |
from_bcd(d->reg[relative_addr]); |
| 525 |
break; |
| 526 |
case NETBSD_HACK_FIRST_2: |
| 527 |
d->reg[relative_addr] = to_bcd( |
| 528 |
d->ugly_netbsd_prep_hack_sec); |
| 529 |
break; |
| 530 |
case NETBSD_HACK_SECOND_1: |
| 531 |
case NETBSD_HACK_SECOND_2: |
| 532 |
d->reg[relative_addr] = to_bcd((1 + |
| 533 |
d->ugly_netbsd_prep_hack_sec) % 60); |
| 534 |
break; |
| 535 |
} |
| 536 |
} |
| 537 |
case 4 * MC_MIN: |
| 538 |
case 4 * MC_HOUR: |
| 539 |
case 4 * MC_DOW: |
| 540 |
case 4 * MC_DOM: |
| 541 |
case 4 * MC_MONTH: |
| 542 |
case 4 * MC_YEAR: |
| 543 |
case 4 * 63: /* 63 is used by Linux on DECstation */ |
| 544 |
case 4 * 72: /* 72 is Century, on SGI (DS1687) */ |
| 545 |
/* |
| 546 |
* If the SET bit is set, then we don't automatically |
| 547 |
* update the values. Otherwise, we update them by |
| 548 |
* reading from the host's clock: |
| 549 |
*/ |
| 550 |
if (d->reg[MC_REGB * 4] & MC_REGB_SET) |
| 551 |
break; |
| 552 |
|
| 553 |
if (d->ugly_netbsd_prep_hack_done >= NETBSD_HACK_DONE) |
| 554 |
mc146818_update_time(d); |
| 555 |
break; |
| 556 |
case 4 * MC_REGA: |
| 557 |
break; |
| 558 |
case 4 * MC_REGC: /* Interrupt ack. */ |
| 559 |
/* NOTE: Acking is done below, _after_ the |
| 560 |
register has been read. */ |
| 561 |
break; |
| 562 |
default:debug("[ mc146818: read from relative_addr = " |
| 563 |
"%04x ]\n", (int)relative_addr); |
| 564 |
} |
| 565 |
|
| 566 |
data[0] = d->reg[relative_addr]; |
| 567 |
|
| 568 |
if (relative_addr == MC_REGC*4) { |
| 569 |
INTERRUPT_DEASSERT(d->irq); |
| 570 |
|
| 571 |
/* |
| 572 |
* Acknowledging an interrupt decreases the |
| 573 |
* number of pending "real world" timer ticks. |
| 574 |
*/ |
| 575 |
if (d->reg[MC_REGC * 4] & MC_REGC_PF && |
| 576 |
d->pending_timer_interrupts > 0) |
| 577 |
d->pending_timer_interrupts --; |
| 578 |
|
| 579 |
d->reg[MC_REGC * 4] = 0x00; |
| 580 |
} |
| 581 |
} |
| 582 |
|
| 583 |
#ifdef MC146818_DEBUG |
| 584 |
if (writeflag == MEM_READ) { |
| 585 |
fatal("[ mc146818: read from addr=0x%04x (len %i): ", |
| 586 |
(int)relative_addr, (int)len); |
| 587 |
for (i=0; i<len; i++) |
| 588 |
fatal("0x%02x ", data[i]); |
| 589 |
fatal("]\n"); |
| 590 |
} |
| 591 |
#endif |
| 592 |
|
| 593 |
return 1; |
| 594 |
} |
| 595 |
|
| 596 |
|
| 597 |
/* |
| 598 |
* dev_mc146818_init(): |
| 599 |
* |
| 600 |
* This needs to work for both DECstation emulation and other machine types, |
| 601 |
* so it contains both rtc related stuff and the station's Ethernet address. |
| 602 |
*/ |
| 603 |
void dev_mc146818_init(struct machine *machine, struct memory *mem, |
| 604 |
uint64_t baseaddr, char *irq_path, int access_style, int addrdiv) |
| 605 |
{ |
| 606 |
unsigned char ether_address[6]; |
| 607 |
int i, dev_len; |
| 608 |
struct mc_data *d; |
| 609 |
|
| 610 |
d = malloc(sizeof(struct mc_data)); |
| 611 |
if (d == NULL) { |
| 612 |
fprintf(stderr, "out of memory\n"); |
| 613 |
exit(1); |
| 614 |
} |
| 615 |
|
| 616 |
memset(d, 0, sizeof(struct mc_data)); |
| 617 |
|
| 618 |
d->access_style = access_style; |
| 619 |
d->addrdiv = addrdiv; |
| 620 |
|
| 621 |
INTERRUPT_CONNECT(irq_path, d->irq); |
| 622 |
|
| 623 |
d->use_bcd = 0; |
| 624 |
switch (access_style) { |
| 625 |
case MC146818_SGI: |
| 626 |
case MC146818_PC_CMOS: |
| 627 |
case MC146818_PMPPC: |
| 628 |
d->use_bcd = 1; |
| 629 |
} |
| 630 |
|
| 631 |
if (machine->machine_type != MACHINE_PREP) { |
| 632 |
/* NetBSD/prep has a really ugly clock detection code; |
| 633 |
no other machines/OSes don't need this. */ |
| 634 |
d->ugly_netbsd_prep_hack_done = NETBSD_HACK_DONE; |
| 635 |
} |
| 636 |
|
| 637 |
if (access_style == MC146818_DEC) { |
| 638 |
/* Station Ethernet Address, on DECstation 3100: */ |
| 639 |
for (i=0; i<6; i++) |
| 640 |
ether_address[i] = 0x10 * (i+1); |
| 641 |
|
| 642 |
d->reg[0x01] = ether_address[0]; |
| 643 |
d->reg[0x05] = ether_address[1]; |
| 644 |
d->reg[0x09] = ether_address[2]; |
| 645 |
d->reg[0x0d] = ether_address[3]; |
| 646 |
d->reg[0x11] = ether_address[4]; |
| 647 |
d->reg[0x15] = ether_address[5]; |
| 648 |
/* TODO: 19, 1d, 21, 25 = checksum bytes 1,2,2,1 resp. */ |
| 649 |
d->reg[0x29] = ether_address[5]; |
| 650 |
d->reg[0x2d] = ether_address[4]; |
| 651 |
d->reg[0x31] = ether_address[3]; |
| 652 |
d->reg[0x35] = ether_address[2]; |
| 653 |
d->reg[0x39] = ether_address[1]; |
| 654 |
d->reg[0x3d] = ether_address[1]; |
| 655 |
d->reg[0x41] = ether_address[0]; |
| 656 |
d->reg[0x45] = ether_address[1]; |
| 657 |
d->reg[0x49] = ether_address[2]; |
| 658 |
d->reg[0x4d] = ether_address[3]; |
| 659 |
d->reg[0x51] = ether_address[4]; |
| 660 |
d->reg[0x55] = ether_address[5]; |
| 661 |
/* TODO: 59, 5d = checksum bytes 1,2 resp. */ |
| 662 |
d->reg[0x61] = 0xff; |
| 663 |
d->reg[0x65] = 0x00; |
| 664 |
d->reg[0x69] = 0x55; |
| 665 |
d->reg[0x6d] = 0xaa; |
| 666 |
d->reg[0x71] = 0xff; |
| 667 |
d->reg[0x75] = 0x00; |
| 668 |
d->reg[0x79] = 0x55; |
| 669 |
d->reg[0x7d] = 0xaa; |
| 670 |
|
| 671 |
/* Battery valid, for DECstations */ |
| 672 |
d->reg[0xf8] = 1; |
| 673 |
} |
| 674 |
|
| 675 |
/* |
| 676 |
* uip_threshold should ideally be 1, but when Linux polls the UIP bit |
| 677 |
* it looses speed. This hack gives Linux the impression that the cpu |
| 678 |
* is uip_threshold times faster than the slow clock it would |
| 679 |
* otherwise detect. |
| 680 |
* |
| 681 |
* TODO: Find out if this messes up Sprite emulation; if so, then |
| 682 |
* this hack has to be removed. |
| 683 |
*/ |
| 684 |
d->uip_threshold = 8; |
| 685 |
|
| 686 |
if (access_style == MC146818_ARC_JAZZ) |
| 687 |
memory_device_register(mem, "mc146818_jazz", 0x90000070ULL, |
| 688 |
1, dev_mc146818_jazz_access, d, DM_DEFAULT, NULL); |
| 689 |
|
| 690 |
dev_len = DEV_MC146818_LENGTH; |
| 691 |
switch (access_style) { |
| 692 |
case MC146818_CATS: |
| 693 |
case MC146818_PC_CMOS: |
| 694 |
dev_len = 2; |
| 695 |
break; |
| 696 |
case MC146818_SGI: |
| 697 |
dev_len = 0x400; |
| 698 |
} |
| 699 |
|
| 700 |
memory_device_register(mem, "mc146818", baseaddr, |
| 701 |
dev_len * addrdiv, dev_mc146818_access, |
| 702 |
d, DM_DEFAULT, NULL); |
| 703 |
|
| 704 |
mc146818_update_time(d); |
| 705 |
|
| 706 |
machine_add_tickfunction(machine, dev_mc146818_tick, d, |
| 707 |
TICK_SHIFT, 0.0); |
| 708 |
} |
| 709 |
|
Parent Directory
| 
Revision Log