isa.c revision 593
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 * $Id$ 38 */ 39 40/* 41 * code to manage AT bus 42 * 43 * 92/08/18 Frank P. MacLachlan (fpm@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 "rlist.h" 59#include "machine/segments.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 67/* 68** Register definitions for DMA controller 1 (channels 0..3): 69*/ 70#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 71#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 72#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 73#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 74 75/* 76** Register definitions for DMA controller 2 (channels 4..7): 77*/ 78#define DMA2_CHN(c) (IO_DMA1 + 2*(2*(c))) /* addr reg for channel c */ 79#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 80#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 81#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 82 83int config_isadev __P((struct isa_device *, u_int *)); 84 85/* 86 * print a conflict message 87 */ 88void 89conflict(dvp, tmpdvp, item, reason, format) 90 struct isa_device *dvp, *tmpdvp; 91 int item; 92 char *reason; 93 char *format; 94{ 95 printf("%s%d not probed due to %s conflict with %s%d at ", 96 dvp->id_driver->name, dvp->id_unit, reason, 97 tmpdvp->id_driver->name, tmpdvp->id_unit); 98 printf(format, item); 99 printf("\n"); 100} 101 102/* 103 * Check to see if things are alread in use, like IRQ's, I/O addresses 104 * and Memory addresses. 105 */ 106int 107haveseen(dvp, tmpdvp) 108 struct isa_device *dvp, *tmpdvp; 109{ 110 int status = 0; 111 112 /* 113 * Only check against devices that have already been found 114 */ 115 if (tmpdvp->id_alive) { 116 /* 117 * Check for I/O address conflict. We can only check the 118 * starting address of the device against the range of the 119 * device that has already been probed since we do not 120 * know how many I/O addresses this device uses. 121 */ 122 if (tmpdvp->id_alive != -1) { 123 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 124 (dvp->id_iobase <= 125 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 126 conflict(dvp, tmpdvp, dvp->id_iobase, 127 "I/O address", "0x%x"); 128 status = 1; 129 } 130 } 131 /* 132 * Check for Memory address conflict. We can check for 133 * range overlap, but it will not catch all cases since the 134 * driver may adjust the msize paramater during probe, for 135 * now we just check that the starting address does not 136 * fall within any allocated region. 137 * XXX could add a second check after the probe for overlap, 138 * since at that time we would know the full range. 139 * XXX KERNBASE is a hack, we should have vaddr in the table! 140 */ 141 if(tmpdvp->id_maddr) { 142 if((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 143 (KERNBASE + dvp->id_maddr <= 144 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 145 conflict(dvp, tmpdvp, dvp->id_maddr, "maddr", 146 "0x%x"); 147 status = 1; 148 } 149 } 150 /* 151 * Check for IRQ conflicts. 152 */ 153 if(tmpdvp->id_irq) { 154 if (tmpdvp->id_irq == dvp->id_irq) { 155 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 156 "irq", "%d"); 157 status = 1; 158 } 159 } 160 /* 161 * Check for DRQ conflicts. 162 */ 163 if(tmpdvp->id_drq != -1) { 164 if (tmpdvp->id_drq == dvp->id_drq) { 165 conflict(dvp, tmpdvp, dvp->id_drq, 166 "drq", "%d"); 167 status = 1; 168 } 169 } 170 } 171 return (status); 172} 173 174/* 175 * Search through all the isa_devtab_* tables looking for anything that 176 * conflicts with the current device. 177 */ 178int 179haveseen_isadev(dvp) 180 struct isa_device *dvp; 181{ 182 struct isa_device *tmpdvp; 183 int status = 0; 184 185 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 186 status |= haveseen(dvp, tmpdvp); 187 } 188 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 189 status |= haveseen(dvp, tmpdvp); 190 } 191 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 192 status |= haveseen(dvp, tmpdvp); 193 } 194 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 195 status |= haveseen(dvp, tmpdvp); 196 } 197 return(status); 198} 199 200/* 201 * Configure all ISA devices 202 */ 203void 204isa_configure() { 205 struct isa_device *dvp; 206 207 enable_intr(); 208 splhigh(); 209 INTREN(IRQ_SLAVE); 210 printf("Probing for devices on the ISA bus:\n"); 211 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) { 212 if (!haveseen_isadev(dvp)) 213 config_isadev(dvp,&ttymask); 214 } 215 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) { 216 if (!haveseen_isadev(dvp)) 217 config_isadev(dvp,&biomask); 218 } 219 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) { 220 if (!haveseen_isadev(dvp)) 221 config_isadev(dvp,&netmask); 222 } 223 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) { 224 if (!haveseen_isadev(dvp)) 225 config_isadev(dvp,(u_int *) NULL); 226 } 227/* 228 * XXX We should really add the tty device to netmask when the line is 229 * switched to SLIPDISC, and then remove it when it is switched away from 230 * SLIPDISC. No need to block out ALL ttys during a splnet when only one 231 * of them is running slip. 232 */ 233#include "sl.h" 234#if NSL > 0 235 netmask |= ttymask; 236 ttymask |= netmask; 237#endif 238 /* biomask |= ttymask ; can some tty devices use buffers? */ 239 printf("biomask %x ttymask %x netmask %x\n", biomask, ttymask, netmask); 240 splnone(); 241} 242 243/* 244 * Configure an ISA device. 245 */ 246config_isadev(isdp, mp) 247 struct isa_device *isdp; 248 u_int *mp; 249{ 250 struct isa_driver *dp = isdp->id_driver; 251 252 if (isdp->id_maddr) { 253 extern u_int atdevbase; 254 255 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 256 isdp->id_maddr += atdevbase; 257 } 258 isdp->id_alive = (*dp->probe)(isdp); 259 if (isdp->id_alive) { 260 /* 261 * Only print the I/O address range if id_alive != -1 262 * Right now this is a temporary fix just for the new 263 * NPX code so that if it finds a 486 that can use trap 264 * 16 it will not report I/O addresses. 265 * Rod Grimes 04/26/94 266 */ 267 printf("%s%d", dp->name, isdp->id_unit); 268 if (isdp->id_alive != -1) { 269 printf(" at 0x%x", isdp->id_iobase); 270 if ((isdp->id_iobase + isdp->id_alive - 1) != 271 isdp->id_iobase) { 272 printf("-0x%x", 273 isdp->id_iobase + 274 isdp->id_alive - 1); 275 } 276 } 277 if(isdp->id_irq) 278 printf(" irq %d", ffs(isdp->id_irq) - 1); 279 if (isdp->id_drq != -1) 280 printf(" drq %d", isdp->id_drq); 281 if (isdp->id_maddr) 282 printf(" maddr 0x%x", kvtop(isdp->id_maddr)); 283 if (isdp->id_msize) 284 printf(" msize %d", isdp->id_msize); 285 if (isdp->id_flags) 286 printf(" flags 0x%x", isdp->id_flags); 287 if (isdp->id_iobase < 0x100) 288 printf(" on motherboard\n"); 289 else 290 printf(" on isa\n"); 291 292 (*dp->attach)(isdp); 293 294 if(isdp->id_irq) { 295 int intrno; 296 297 intrno = ffs(isdp->id_irq)-1; 298 setidt(ICU_OFFSET+intrno, isdp->id_intr, 299 SDT_SYS386IGT, SEL_KPL); 300 if(mp) { 301 INTRMASK(*mp,isdp->id_irq); 302 } 303 INTREN(isdp->id_irq); 304 } 305 } else { 306 printf("%s%d not found", dp->name, isdp->id_unit); 307 if (isdp->id_iobase) { 308 printf(" at 0x%x", isdp->id_iobase); 309 } 310 printf("\n"); 311 } 312} 313 314#define IDTVEC(name) __CONCAT(X,name) 315/* default interrupt vector table entries */ 316extern IDTVEC(intr0), IDTVEC(intr1), IDTVEC(intr2), IDTVEC(intr3), 317 IDTVEC(intr4), IDTVEC(intr5), IDTVEC(intr6), IDTVEC(intr7), 318 IDTVEC(intr8), IDTVEC(intr9), IDTVEC(intr10), IDTVEC(intr11), 319 IDTVEC(intr12), IDTVEC(intr13), IDTVEC(intr14), IDTVEC(intr15); 320 321static *defvec[16] = { 322 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 323 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 324 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 325 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) }; 326 327/* out of range default interrupt vector gate entry */ 328extern IDTVEC(intrdefault); 329 330/* 331 * Fill in default interrupt table (in case of spuruious interrupt 332 * during configuration of kernel, setup interrupt control unit 333 */ 334isa_defaultirq() { 335 int i; 336 337 /* icu vectors */ 338 for (i = NRSVIDT ; i < NRSVIDT+ICU_LEN ; i++) 339 setidt(i, defvec[i], SDT_SYS386IGT, SEL_KPL); 340 341 /* out of range vectors */ 342 for (i = NRSVIDT; i < NIDT; i++) 343 setidt(i, &IDTVEC(intrdefault), SDT_SYS386IGT, SEL_KPL); 344 345 /* initialize 8259's */ 346 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 347 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 348 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 349#ifdef AUTO_EOI_1 350 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 351#else 352 outb(IO_ICU1+1, 1); /* 8086 mode */ 353#endif 354 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 355 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 356 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 357 358 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 359 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 360 outb(IO_ICU2+1,2); /* my slave id is 2 */ 361#ifdef AUTO_EOI_2 362 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 363#else 364 outb(IO_ICU2+1,1); /* 8086 mode */ 365#endif 366 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 367 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 368} 369 370/* region of physical memory known to be contiguous */ 371vm_offset_t isaphysmem; 372static caddr_t dma_bounce[8]; /* XXX */ 373static char bounced[8]; /* XXX */ 374#define MAXDMASZ 512 /* XXX */ 375 376/* high byte of address is stored in this port for i-th dma channel */ 377static short dmapageport[8] = 378 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 379 380/* 381 * isa_dmacascade(): program 8237 DMA controller channel to accept 382 * external dma control by a board. 383 */ 384void isa_dmacascade(unsigned chan) 385{ 386 if (chan > 7) 387 panic("isa_dmacascade: impossible request"); 388 389 /* set dma channel mode, and set dma channel mode */ 390 if ((chan & 4) == 0) { 391 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 392 outb(DMA1_SMSK, chan); 393 } else { 394 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 395 outb(DMA2_SMSK, chan & 3); 396 } 397} 398 399/* 400 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 401 * problems by using a bounce buffer. 402 */ 403void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 404{ vm_offset_t phys; 405 int waport; 406 caddr_t newaddr; 407 408 if ( chan > 7 409 || (chan < 4 && nbytes > (1<<16)) 410 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 411 panic("isa_dmastart: impossible request"); 412 413 if (isa_dmarangecheck(addr, nbytes, chan)) { 414 if (dma_bounce[chan] == 0) 415 dma_bounce[chan] = 416 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 417 (caddr_t) isaphysmem + NBPG*chan; 418 bounced[chan] = 1; 419 newaddr = dma_bounce[chan]; 420 *(int *) newaddr = 0; /* XXX */ 421 422 /* copy bounce buffer on write */ 423 if (!(flags & B_READ)) 424 bcopy(addr, newaddr, nbytes); 425 addr = newaddr; 426 } 427 428 /* translate to physical */ 429 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 430 431 if ((chan & 4) == 0) { 432 /* 433 * Program one of DMA channels 0..3. These are 434 * byte mode channels. 435 */ 436 /* set dma channel mode, and reset address ff */ 437 if (flags & B_READ) 438 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 439 else 440 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 441 outb(DMA1_FFC, 0); 442 443 /* send start address */ 444 waport = DMA1_CHN(chan); 445 outb(waport, phys); 446 outb(waport, phys>>8); 447 outb(dmapageport[chan], phys>>16); 448 449 /* send count */ 450 outb(waport + 1, --nbytes); 451 outb(waport + 1, nbytes>>8); 452 453 /* unmask channel */ 454 outb(DMA1_SMSK, chan); 455 } else { 456 /* 457 * Program one of DMA channels 4..7. These are 458 * word mode channels. 459 */ 460 /* set dma channel mode, and reset address ff */ 461 if (flags & B_READ) 462 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 463 else 464 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 465 outb(DMA2_FFC, 0); 466 467 /* send start address */ 468 waport = DMA2_CHN(chan - 4); 469 outb(waport, phys>>1); 470 outb(waport, phys>>9); 471 outb(dmapageport[chan], phys>>16); 472 473 /* send count */ 474 nbytes >>= 1; 475 outb(waport + 2, --nbytes); 476 outb(waport + 2, nbytes>>8); 477 478 /* unmask channel */ 479 outb(DMA2_SMSK, chan & 3); 480 } 481} 482 483void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 484{ 485 486 /* copy bounce buffer on read */ 487 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 488 if (bounced[chan]) { 489 bcopy(dma_bounce[chan], addr, nbytes); 490 bounced[chan] = 0; 491 } 492} 493 494/* 495 * Check for problems with the address range of a DMA transfer 496 * (non-contiguous physical pages, outside of bus address space, 497 * crossing DMA page boundaries). 498 * Return true if special handling needed. 499 */ 500 501isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 502 vm_offset_t phys, priorpage = 0, endva; 503 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 504 505 endva = (vm_offset_t)round_page(va + length); 506 for (; va < (caddr_t) endva ; va += NBPG) { 507 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 508#define ISARAM_END RAM_END 509 if (phys == 0) 510 panic("isa_dmacheck: no physical page present"); 511 if (phys > ISARAM_END) 512 return (1); 513 if (priorpage) { 514 if (priorpage + NBPG != phys) 515 return (1); 516 /* check if crossing a DMA page boundary */ 517 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 518 return (1); 519 } 520 priorpage = phys; 521 } 522 return (0); 523} 524 525/* head of queue waiting for physmem to become available */ 526struct buf isa_physmemq; 527 528/* blocked waiting for resource to become free for exclusive use */ 529static isaphysmemflag; 530/* if waited for and call requested when free (B_CALL) */ 531static void (*isaphysmemunblock)(); /* needs to be a list */ 532 533/* 534 * Allocate contiguous physical memory for transfer, returning 535 * a *virtual* address to region. May block waiting for resource. 536 * (assumed to be called at splbio()) 537 */ 538caddr_t 539isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 540 541 isaphysmemunblock = func; 542 while (isaphysmemflag & B_BUSY) { 543 isaphysmemflag |= B_WANTED; 544 sleep(&isaphysmemflag, PRIBIO); 545 } 546 isaphysmemflag |= B_BUSY; 547 548 return((caddr_t)isaphysmem); 549} 550 551/* 552 * Free contiguous physical memory used for transfer. 553 * (assumed to be called at splbio()) 554 */ 555void 556isa_freephysmem(caddr_t va, unsigned length) { 557 558 isaphysmemflag &= ~B_BUSY; 559 if (isaphysmemflag & B_WANTED) { 560 isaphysmemflag &= B_WANTED; 561 wakeup(&isaphysmemflag); 562 if (isaphysmemunblock) 563 (*isaphysmemunblock)(); 564 } 565} 566 567/* 568 * Handle a NMI, possibly a machine check. 569 * return true to panic system, false to ignore. 570 */ 571isa_nmi(cd) { 572 573 log(LOG_CRIT, "\nNMI port 61 %x, port 70 %x\n", inb(0x61), inb(0x70)); 574 return(0); 575} 576 577/* 578 * Caught a stray interrupt, notify 579 */ 580isa_strayintr(d) { 581 582 /* DON'T BOTHER FOR NOW! */ 583 /* for some reason, we get bursts of intr #7, even if not enabled! */ 584 /* 585 * Well the reason you got bursts of intr #7 is because someone 586 * raised an interrupt line and dropped it before the 8259 could 587 * prioritize it. This is documented in the intel data book. This 588 * means you have BAD hardware! I have changed this so that only 589 * the first 5 get logged, then it quits logging them, and puts 590 * out a special message. rgrimes 3/25/1993 591 */ 592 extern u_long intrcnt_stray; 593 594 intrcnt_stray++; 595 if (intrcnt_stray <= 5) 596 log(LOG_ERR,"ISA strayintr %x\n", d); 597 if (intrcnt_stray == 5) 598 log(LOG_CRIT,"Too many ISA strayintr not logging any more\n"); 599} 600 601/* 602 * Wait "n" microseconds. 603 * Relies on timer 1 counting down from (TIMER_FREQ / hz) at 604 * (1 * TIMER_FREQ) Hz. 605 * Note: timer had better have been programmed before this is first used! 606 * (The standard programming causes the timer to generate a square wave and 607 * the counter is decremented twice every cycle.) 608 */ 609#define CF (1 * TIMER_FREQ) 610#define TIMER_FREQ 1193182 /* XXX - should be elsewhere */ 611 612extern int hz; /* XXX - should be elsewhere */ 613 614int DELAY(n) 615 int n; 616{ 617 int counter_limit; 618 int prev_tick; 619 int tick; 620 int ticks_left; 621 int sec; 622 int usec; 623 624#ifdef DELAYDEBUG 625 int getit_calls = 1; 626 int n1; 627 static int state = 0; 628 629 if (state == 0) { 630 state = 1; 631 for (n1 = 1; n1 <= 10000000; n1 *= 10) 632 DELAY(n1); 633 state = 2; 634 } 635 if (state == 1) 636 printf("DELAY(%d)...", n); 637#endif 638 639 /* 640 * Read the counter first, so that the rest of the setup overhead is 641 * counted. Guess the initial overhead is 20 usec (on most systems it 642 * takes about 1.5 usec for each of the i/o's in getit(). The loop 643 * takes about 6 usec on a 486/33 and 13 usec on a 386/20. The 644 * multiplications and divisions to scale the count take a while). 645 */ 646 prev_tick = getit(0, 0); 647 n -= 20; 648 649 /* 650 * Calculate (n * (CF / 1e6)) without using floating point and without 651 * any avoidable overflows. 652 */ 653 sec = n / 1000000; 654 usec = n - sec * 1000000; 655 ticks_left = sec * CF 656 + usec * (CF / 1000000) 657 + usec * ((CF % 1000000) / 1000) / 1000 658 + usec * (CF % 1000) / 1000000; 659 660 counter_limit = TIMER_FREQ / hz; 661 while (ticks_left > 0) { 662 tick = getit(0, 0); 663#ifdef DELAYDEBUG 664 ++getit_calls; 665#endif 666 if (tick > prev_tick) 667 ticks_left -= prev_tick - (tick - counter_limit); 668 else 669 ticks_left -= prev_tick - tick; 670 prev_tick = tick; 671 } 672#ifdef DELAYDEBUG 673 if (state == 1) 674 printf(" %d calls to getit() at %d usec each\n", 675 getit_calls, (n + 5) / getit_calls); 676#endif 677} 678 679getit(unit, timer) { 680 int high; 681 int low; 682 683 /* 684 * XXX - isa.h defines bogus timers. There's no such timer as 685 * IO_TIMER_2 = 0x48. There's a timer in the CMOS RAM chip but 686 * its interface is quite different. Neither timer is an 8252. 687 * We actually only call this with unit = 0 and timer = 0. It 688 * could be static... 689 */ 690 /* 691 * Protect ourself against interrupts. 692 * XXX - sysbeep() and sysbeepstop() need protection. 693 */ 694 disable_intr(); 695 /* 696 * Latch the count for 'timer' (cc00xxxx, c = counter, x = any). 697 */ 698 outb(IO_TIMER1 + 3, timer << 6); 699 700 low = inb(IO_TIMER1 + timer); 701 high = inb(IO_TIMER1 + timer); 702 enable_intr(); 703 return ((high << 8) | low); 704} 705 706static beeping; 707static 708sysbeepstop(f) 709{ 710 /* disable counter 2 */ 711 outb(0x61, inb(0x61) & 0xFC); 712 if (f) 713 timeout(sysbeepstop, 0, f); 714 else 715 beeping = 0; 716} 717 718void sysbeep(int pitch, int period) 719{ 720 721 outb(0x61, inb(0x61) | 3); /* enable counter 2 */ 722 /* 723 * XXX - move timer stuff to clock.c. 724 * Program counter 2: 725 * ccaammmb, c counter, a = access, m = mode, b = BCD 726 * 1011x110, 11 for aa = LSB then MSB, x11 for mmm = square wave. 727 */ 728 outb(0x43, 0xb6); /* set command for counter 2, 2 byte write */ 729 730 outb(0x42, pitch); 731 outb(0x42, (pitch>>8)); 732 733 if (!beeping) { 734 beeping = period; 735 timeout(sysbeepstop, period/2, period); 736 } 737} 738 739/* 740 * Pass command to keyboard controller (8042) 741 */ 742unsigned kbc_8042cmd(val) { 743 744 while (inb(KBSTATP)&KBS_IBF); 745 if (val) outb(KBCMDP, val); 746 while (inb(KBSTATP)&KBS_IBF); 747 return (inb(KBDATAP)); 748} 749 750/* 751 * find an ISA device in a given isa_devtab_* table, given 752 * the table to search, the expected id_driver entry, and the unit number. 753 * 754 * this function is defined in isa_device.h, and this location is debatable; 755 * i put it there because it's useless w/o, and directly operates on 756 * the other stuff in that file. 757 * 758 */ 759 760struct isa_device *find_isadev(table, driverp, unit) 761 struct isa_device *table; 762 struct isa_driver *driverp; 763 int unit; 764{ 765 if (driverp == NULL) /* sanity check */ 766 return NULL; 767 768 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 769 if (table->id_driver == 0) 770 return NULL; 771 772 table++; 773 } 774 775 return table; 776} 777 778/* 779 * Return nonzero if a (masked) irq is pending for a given device. 780 */ 781int 782isa_irq_pending(dvp) 783 struct isa_device *dvp; 784{ 785 unsigned id_irq; 786 787 id_irq = (unsigned short) dvp->id_irq; /* XXX silly type in struct */ 788 if (id_irq & 0xff) 789 return (inb(IO_ICU1) & id_irq); 790 return (inb(IO_ICU2) & (id_irq >> 8)); 791} 792