isa.c revision 1.30
1 /*- 2 * Copyright (c) 1991 The Regents of the University of California. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to Berkeley by 6 * William Jolitz. 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 3. All advertising materials mentioning features or use of this software 17 * must display the following acknowledgement: 18 * This product includes software developed by the University of 19 * California, Berkeley and its contributors. 20 * 4. Neither the name of the University nor the names of its contributors 21 * may be used to endorse or promote products derived from this software 22 * without specific prior written permission. 23 * 24 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 27 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 34 * SUCH DAMAGE. 35 * 36 * from: @(#)isa.c 7.2 (Berkeley) 5/13/91 37 * $Id: isa.c,v 1.30 1993/12/17 00:11:48 mycroft Exp $ 38 */ 39 40 /* 41 * code to manage AT bus 42 * 43 * 92/08/18 Frank P. MacLachlan (fpm (at) crash.cts.com): 44 * Fixed uninitialized variable problem and added code to deal 45 * with DMA page boundaries in isa_dmarangecheck(). Fixed word 46 * mode DMA count compution and reorganized DMA setup code in 47 * isa_dmastart() 48 */ 49 50 #include "param.h" 51 #include "systm.h" 52 #include "conf.h" 53 #include "file.h" 54 #include "buf.h" 55 #include "uio.h" 56 #include "syslog.h" 57 #include "malloc.h" 58 #include "machine/segments.h" 59 #include "machine/cpufunc.h" 60 #include "vm/vm.h" 61 #include "i386/isa/isa_device.h" 62 #include "i386/isa/isa.h" 63 #include "i386/isa/icu.h" 64 #include "i386/isa/ic/i8237.h" 65 #include "i386/isa/ic/i8042.h" 66 #include "i386/isa/timerreg.h" 67 #include "i386/isa/spkr_reg.h" 68 69 /* sorry, has to be here, no place else really suitable */ 70 #include "machine/pc/display.h" 71 u_short *Crtat = (u_short *)MONO_BUF; 72 73 /* 74 ** Register definitions for DMA controller 1 (channels 0..3): 75 */ 76 #define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 77 #define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 78 #define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 79 #define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 80 81 /* 82 ** Register definitions for DMA controller 2 (channels 4..7): 83 */ 84 #define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 85 #define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 86 #define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 87 #define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 88 89 int config_isadev(struct isa_device *, u_int *); 90 void config_attach(struct isa_driver *, struct isa_device *); 91 static void sysbeepstop(int); 92 93 /* 94 * Configure all ISA devices 95 */ 96 void 97 isa_configure() 98 { 99 struct isa_device *dvp; 100 struct isa_driver *dp; 101 102 splhigh(); 103 INTREN(IRQ_SLAVE); 104 enable_intr(); 105 106 for (dvp = isa_devtab_tty; config_isadev(dvp,&ttymask); dvp++) 107 ; 108 for (dvp = isa_devtab_bio; config_isadev(dvp,&biomask); dvp++) 109 ; 110 for (dvp = isa_devtab_net; config_isadev(dvp,&netmask); dvp++) 111 ; 112 for (dvp = isa_devtab_null; config_isadev(dvp, (u_int *) NULL); dvp++) 113 ; 114 115 printf("biomask %x ttymask %x netmask %x\n", 116 biomask, ttymask, netmask); 117 118 biomask |= astmask; 119 ttymask |= astmask; 120 netmask |= astmask; 121 impmask = netmask | ttymask; 122 123 spl0(); 124 } 125 126 /* 127 * Configure an ISA device. 128 */ 129 int 130 config_isadev(isdp, mp) 131 struct isa_device *isdp; 132 u_int *mp; 133 { 134 struct isa_driver *dp; 135 136 if (dp = isdp->id_driver) { 137 if (isdp->id_maddr) { 138 extern u_int atdevbase; 139 140 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 141 isdp->id_maddr += atdevbase; 142 } 143 isdp->id_alive = (*dp->probe)(isdp); 144 if (isdp->id_irq == (u_short)-1) 145 isdp->id_alive = 0; 146 /* 147 * Only print the I/O address range if id_alive != -1 148 * Right now this is a temporary fix just for the new 149 * NPX code so that if it finds a 486 that can use trap 150 * 16 it will not report I/O addresses. 151 * Rod Grimes 04/26/94 152 * 153 * XXX -- cgd 154 */ 155 if (isdp->id_alive) { 156 printf("%s%d", dp->name, isdp->id_unit); 157 if (isdp->id_iobase) { 158 printf(" at 0x%x", isdp->id_iobase); 159 if ((isdp->id_iobase + isdp->id_alive - 1) != 160 isdp->id_iobase) 161 printf("-0x%x", isdp->id_iobase + 162 isdp->id_alive - 1); 163 } 164 if (isdp->id_irq != 0) 165 printf(" irq %d", ffs(isdp->id_irq)-1); 166 if (isdp->id_drq != -1) 167 printf(" drq %d", isdp->id_drq); 168 if (isdp->id_maddr != 0) 169 printf(" maddr 0x%x", kvtop(isdp->id_maddr)); 170 if (isdp->id_msize != 0) 171 printf("-0x%x", kvtop(isdp->id_maddr) + 172 isdp->id_msize - 1); 173 if (isdp->id_flags != 0) 174 printf(" flags 0x%x", isdp->id_flags); 175 printf(" on isa\n"); 176 177 config_attach(dp, isdp); 178 179 if (isdp->id_irq) { 180 int intrno; 181 182 intrno = ffs(isdp->id_irq)-1; 183 setidt(ICU_OFFSET+intrno, isdp->id_intr, 184 SDT_SYS386IGT, SEL_KPL); 185 if(mp) 186 INTRMASK(*mp,isdp->id_irq); 187 INTREN(isdp->id_irq); 188 } 189 } 190 return (1); 191 } else return(0); 192 } 193 194 void 195 config_attach(struct isa_driver *dp, struct isa_device *isdp) 196 { 197 extern struct isa_device isa_subdev[]; 198 struct isa_device *dvp; 199 200 if(isdp->id_masunit==-1) { 201 (void)(*dp->attach)(isdp); 202 return; 203 } 204 205 if(isdp->id_masunit==0) { 206 for(dvp = isa_subdev; dvp->id_driver; dvp++) { 207 if (dvp->id_driver != dp) 208 continue; 209 if (dvp->id_masunit != isdp->id_unit) 210 continue; 211 if (dvp->id_physid == -1) 212 continue; 213 dvp->id_alive = (*dp->attach)(dvp); 214 } 215 for(dvp = isa_subdev; dvp->id_driver; dvp++) { 216 if (dvp->id_driver != dp) 217 continue; 218 if (dvp->id_masunit != isdp->id_unit) 219 continue; 220 if (dvp->id_physid != -1) 221 continue; 222 dvp->id_alive = (*dp->attach)(dvp); 223 } 224 return; 225 } 226 printf("id_masunit has weird value\n"); 227 } 228 229 230 #define IDTVEC(name) __CONCAT(X,name) 231 /* default interrupt vector table entries */ 232 extern IDTVEC(intr0), IDTVEC(intr1), IDTVEC(intr2), IDTVEC(intr3), 233 IDTVEC(intr4), IDTVEC(intr5), IDTVEC(intr6), IDTVEC(intr7), 234 IDTVEC(intr8), IDTVEC(intr9), IDTVEC(intr10), IDTVEC(intr11), 235 IDTVEC(intr12), IDTVEC(intr13), IDTVEC(intr14), IDTVEC(intr15); 236 237 static *defvec[16] = { 238 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 239 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 240 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 241 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) }; 242 243 /* out of range default interrupt vector gate entry */ 244 extern IDTVEC(intrdefault); 245 246 /* 247 * Fill in default interrupt table (in case of spuruious interrupt 248 * during configuration of kernel, setup interrupt control unit 249 */ 250 void 251 isa_defaultirq() { 252 int i; 253 254 /* icu vectors */ 255 for (i = NRSVIDT ; i < NRSVIDT+ICU_LEN ; i++) 256 setidt(i, defvec[i], SDT_SYS386IGT, SEL_KPL); 257 258 /* out of range vectors */ 259 for (i = NRSVIDT; i < NIDT; i++) 260 setidt(i, &IDTVEC(intrdefault), SDT_SYS386IGT, SEL_KPL); 261 262 /* initialize 8259's */ 263 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 264 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 265 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 266 #ifdef AUTO_EOI_1 267 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 268 #else 269 outb(IO_ICU1+1, 1); /* 8086 mode */ 270 #endif 271 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 272 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 273 #ifdef REORDER_IRQ 274 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 275 #endif 276 277 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 278 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 279 outb(IO_ICU2+1,2); /* my slave id is 2 */ 280 #ifdef AUTO_EOI_2 281 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 282 #else 283 outb(IO_ICU2+1,1); /* 8086 mode */ 284 #endif 285 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 286 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 287 } 288 289 /* region of physical memory known to be contiguous */ 290 vm_offset_t isaphysmem; 291 static caddr_t dma_bounce[8]; /* XXX */ 292 static char bounced[8]; /* XXX */ 293 #define MAXDMASZ 512 /* XXX */ 294 295 /* high byte of address is stored in this port for i-th dma channel */ 296 static short dmapageport[8] = 297 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 298 299 /* 300 * isa_dmacascade(): program 8237 DMA controller channel to accept 301 * external dma control by a board. 302 */ 303 void 304 isa_dmacascade(unsigned chan) 305 { 306 if (chan > 7) 307 panic("isa_dmacascade: impossible request"); 308 309 /* set dma channel mode, and set dma channel mode */ 310 if ((chan & 4) == 0) { 311 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 312 outb(DMA1_SMSK, chan); 313 } else { 314 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 315 outb(DMA2_SMSK, chan & 3); 316 } 317 } 318 319 /* 320 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 321 * problems by using a bounce buffer. 322 */ 323 void 324 isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 325 { vm_offset_t phys; 326 int waport; 327 caddr_t newaddr; 328 329 if ( chan > 7 330 || (chan < 4 && nbytes > (1<<16)) 331 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 332 panic("isa_dmastart: impossible request"); 333 334 if (isa_dmarangecheck(addr, nbytes, chan)) { 335 if (dma_bounce[chan] == 0) 336 dma_bounce[chan] = 337 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 338 (caddr_t) isaphysmem + NBPG*chan; 339 bounced[chan] = 1; 340 newaddr = dma_bounce[chan]; 341 *(int *) newaddr = 0; /* XXX */ 342 343 /* copy bounce buffer on write */ 344 if (!(flags & B_READ)) 345 bcopy(addr, newaddr, nbytes); 346 addr = newaddr; 347 } 348 349 /* translate to physical */ 350 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 351 352 if ((chan & 4) == 0) { 353 /* 354 * Program one of DMA channels 0..3. These are 355 * byte mode channels. 356 */ 357 /* set dma channel mode, and reset address ff */ 358 if (flags & B_READ) 359 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 360 else 361 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 362 outb(DMA1_FFC, 0); 363 364 /* send start address */ 365 waport = DMA1_CHN(chan); 366 outb(waport, phys); 367 outb(waport, phys>>8); 368 outb(dmapageport[chan], phys>>16); 369 370 /* send count */ 371 outb(waport + 1, --nbytes); 372 outb(waport + 1, nbytes>>8); 373 374 /* unmask channel */ 375 outb(DMA1_SMSK, chan); 376 } else { 377 /* 378 * Program one of DMA channels 4..7. These are 379 * word mode channels. 380 */ 381 /* set dma channel mode, and reset address ff */ 382 if (flags & B_READ) 383 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 384 else 385 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 386 outb(DMA2_FFC, 0); 387 388 /* send start address */ 389 waport = DMA2_CHN(chan - 4); 390 outb(waport, phys>>1); 391 outb(waport, phys>>9); 392 outb(dmapageport[chan], phys>>16); 393 394 /* send count */ 395 nbytes >>= 1; 396 outb(waport + 2, --nbytes); 397 outb(waport + 2, nbytes>>8); 398 399 /* unmask channel */ 400 outb(DMA2_SMSK, chan & 3); 401 } 402 } 403 404 void 405 isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 406 { 407 408 /* copy bounce buffer on read */ 409 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 410 if (bounced[chan]) { 411 bcopy(dma_bounce[chan], addr, nbytes); 412 bounced[chan] = 0; 413 } 414 } 415 416 /* 417 * Check for problems with the address range of a DMA transfer 418 * (non-contiguous physical pages, outside of bus address space, 419 * crossing DMA page boundaries). 420 * Return true if special handling needed. 421 */ 422 423 int 424 isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 425 vm_offset_t phys, priorpage = 0, endva; 426 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 427 428 endva = (vm_offset_t)round_page(va + length); 429 for (; va < (caddr_t) endva ; va += NBPG) { 430 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 431 #define ISARAM_END RAM_END 432 if (phys == 0) 433 panic("isa_dmacheck: no physical page present"); 434 if (phys > ISARAM_END) 435 return (1); 436 if (priorpage) { 437 if (priorpage + NBPG != phys) 438 return (1); 439 /* check if crossing a DMA page boundary */ 440 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 441 return (1); 442 } 443 priorpage = phys; 444 } 445 return (0); 446 } 447 448 /* head of queue waiting for physmem to become available */ 449 struct buf isa_physmemq; 450 451 /* blocked waiting for resource to become free for exclusive use */ 452 static isaphysmemflag; 453 /* if waited for and call requested when free (B_CALL) */ 454 static void (*isaphysmemunblock)(); /* needs to be a list */ 455 456 /* 457 * Allocate contiguous physical memory for transfer, returning 458 * a *virtual* address to region. May block waiting for resource. 459 * (assumed to be called at splbio()) 460 */ 461 caddr_t 462 isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 463 464 isaphysmemunblock = func; 465 while (isaphysmemflag & B_BUSY) { 466 isaphysmemflag |= B_WANTED; 467 sleep((caddr_t)&isaphysmemflag, PRIBIO); 468 } 469 isaphysmemflag |= B_BUSY; 470 471 return((caddr_t)isaphysmem); 472 } 473 474 /* 475 * Free contiguous physical memory used for transfer. 476 * (assumed to be called at splbio()) 477 */ 478 void 479 isa_freephysmem(caddr_t va, unsigned length) { 480 481 isaphysmemflag &= ~B_BUSY; 482 if (isaphysmemflag & B_WANTED) { 483 isaphysmemflag &= B_WANTED; 484 wakeup((caddr_t)&isaphysmemflag); 485 if (isaphysmemunblock) 486 (*isaphysmemunblock)(); 487 } 488 } 489 490 /* 491 * Handle a NMI, possibly a machine check. 492 * return true to panic system, false to ignore. 493 */ 494 int 495 isa_nmi(cd) { 496 497 log(LOG_CRIT, "\nNMI port 61 %x, port 70 %x\n", inb(0x61), inb(0x70)); 498 return(0); 499 } 500 501 /* 502 * Caught a stray interrupt, notify 503 */ 504 void 505 isa_strayintr(d) { 506 507 /* DON'T BOTHER FOR NOW! */ 508 /* for some reason, we get bursts of intr #7, even if not enabled! */ 509 /* 510 * Well the reason you got bursts of intr #7 is because someone 511 * raised an interrupt line and dropped it before the 8259 could 512 * prioritize it. This is documented in the intel data book. This 513 * means you have BAD hardware! I have changed this so that only 514 * the first 5 get logged, then it quits logging them, and puts 515 * out a special message. rgrimes 3/25/1993 516 */ 517 extern u_long intrcnt_stray; 518 519 intrcnt_stray++; 520 if (intrcnt_stray <= 5) 521 log(LOG_ERR,"ISA strayintr %x\n", d); 522 if (intrcnt_stray == 5) 523 log(LOG_CRIT,"Too many ISA strayintr not logging any more\n"); 524 } 525 526 /* 527 * Wait "n" microseconds. 528 * Relies on timer 1 counting down from (TIMER_FREQ / hz) at 529 * (1 * TIMER_FREQ) Hz. 530 * Note: timer had better have been programmed before this is first used! 531 * (Note that we use `rate generator' mode, which counts at 1:1; `square 532 * wave' mode counts at 2:1). 533 */ 534 #define CF (1 * TIMER_FREQ) 535 536 extern int hz; /* XXX - should be elsewhere */ 537 538 void 539 DELAY(n) 540 int n; 541 { 542 int counter_limit; 543 int prev_tick; 544 int tick; 545 int ticks_left; 546 int sec; 547 int usec; 548 549 #ifdef DELAYDEBUG 550 int gettick_calls = 1; 551 int n1; 552 static int state = 0; 553 554 if (state == 0) { 555 state = 1; 556 for (n1 = 1; n1 <= 10000000; n1 *= 10) 557 DELAY(n1); 558 state = 2; 559 } 560 if (state == 1) 561 printf("DELAY(%d)...", n); 562 #endif 563 564 /* 565 * Read the counter first, so that the rest of the setup overhead is 566 * counted. Guess the initial overhead is 20 usec (on most systems it 567 * takes about 1.5 usec for each of the i/o's in gettick(). The loop 568 * takes about 6 usec on a 486/33 and 13 usec on a 386/20. The 569 * multiplications and divisions to scale the count take a while). 570 */ 571 prev_tick = gettick(); 572 n -= 20; 573 574 /* 575 * Calculate (n * (CF / 1e6)) without using floating point and without 576 * any avoidable overflows. 577 */ 578 sec = n / 1000000; 579 usec = n - sec * 1000000; 580 ticks_left = sec * CF 581 + usec * (CF / 1000000) 582 + usec * ((CF % 1000000) / 1000) / 1000 583 + usec * (CF % 1000) / 1000000; 584 585 counter_limit = TIMER_FREQ / hz; 586 while (ticks_left > 0) { 587 tick = gettick(); 588 #ifdef DELAYDEBUG 589 ++gettick_calls; 590 #endif 591 if (tick > prev_tick) 592 ticks_left -= prev_tick - (tick - counter_limit); 593 else 594 ticks_left -= prev_tick - tick; 595 prev_tick = tick; 596 } 597 #ifdef DELAYDEBUG 598 if (state == 1) 599 printf(" %d calls to gettick() at %d usec each\n", 600 gettick_calls, (n + 5) / gettick_calls); 601 #endif 602 } 603 604 int 605 gettick() { 606 int high; 607 int low; 608 609 /* 610 * Protect ourself against interrupts. 611 */ 612 disable_intr(); 613 /* 614 * Latch the count for 'timer' (cc00xxxx, c = counter, x = any). 615 */ 616 outb(TIMER_MODE, TIMER_SEL0 | TIMER_LATCH); 617 low = inb(TIMER_CNTR0); 618 high = inb(TIMER_CNTR0); 619 enable_intr(); 620 return ((high << 8) | low); 621 } 622 623 static beeping; 624 static void 625 sysbeepstop(int f) 626 { 627 int s = splhigh(); 628 629 /* disable counter 2 */ 630 disable_intr(); 631 outb(PITAUX_PORT, inb(PITAUX_PORT) & ~PIT_SPKR); 632 enable_intr(); 633 if (f) 634 timeout((timeout_t)sysbeepstop, (caddr_t)0, f); 635 else 636 beeping = 0; 637 638 splx(s); 639 } 640 641 void 642 sysbeep(int pitch, int period) 643 { 644 int s = splhigh(); 645 static int last_pitch, last_period; 646 647 if (beeping) { 648 untimeout((timeout_t)sysbeepstop, (caddr_t)(last_period/2)); 649 untimeout((timeout_t)sysbeepstop, (caddr_t)0); 650 } 651 if (!beeping || last_pitch != pitch) { 652 /* 653 * XXX - move timer stuff to clock.c. 654 */ 655 disable_intr(); 656 outb(TIMER_MODE, TIMER_SEL2|TIMER_16BIT|TIMER_SQWAVE); 657 outb(TIMER_CNTR2, TIMER_DIV(pitch)%256); 658 outb(TIMER_CNTR2, TIMER_DIV(pitch)/256); 659 outb(PITAUX_PORT, inb(PITAUX_PORT) | PIT_SPKR); /* enable counter 2 */ 660 enable_intr(); 661 } 662 last_pitch = pitch; 663 beeping = last_period = period; 664 timeout((timeout_t)sysbeepstop, (caddr_t)(period/2), period); 665 666 splx(s); 667 } 668 669 /* 670 * Pass command to keyboard controller (8042) 671 */ 672 unsigned 673 kbc_8042cmd(int val) 674 { 675 while (inb(KBSTATP)&KBS_IBF); 676 if (val) outb(KBCMDP, val); 677 while (inb(KBSTATP)&KBS_IBF); 678 return (inb(KBDATAP)); 679 } 680 681 /* 682 * find an ISA device in a given isa_devtab_* table, given 683 * the table to search, the expected id_driver entry, and the unit number. 684 * 685 * this function is defined in isa_device.h, and this location is debatable; 686 * i put it there because it's useless w/o, and directly operates on 687 * the other stuff in that file. 688 * 689 */ 690 691 struct isa_device *find_isadev(table, driverp, unit) 692 struct isa_device *table; 693 struct isa_driver *driverp; 694 int unit; 695 { 696 if (driverp == NULL) /* sanity check */ 697 return NULL; 698 699 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 700 if (table->id_driver == 0) 701 return NULL; 702 703 table++; 704 } 705 706 return table; 707 } 708 709 /* 710 * Return nonzero if a (masked) irq is pending for a given device. 711 */ 712 int 713 isa_irq_pending(dvp) 714 struct isa_device *dvp; 715 { 716 unsigned id_irq; 717 718 id_irq = (unsigned short) dvp->id_irq; /* XXX silly type in struct */ 719 if (id_irq & 0xff) 720 return (inb(IO_ICU1) & id_irq); 721 return (inb(IO_ICU2) & (id_irq >> 8)); 722 } 723
Indexes created Tue Sep 30 17:09:57 GMT 2025