isa.c revision 2056
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 1.19 1994/08/10 04:39:52 wollman Exp $ 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 <sys/param.h> 51#include <sys/systm.h> /* isn't it a joy */ 52#include <sys/kernel.h> /* to have three of these */ 53#include <sys/conf.h> 54#include <sys/file.h> 55#include <sys/buf.h> 56#include <sys/uio.h> 57#include <sys/syslog.h> 58#include <sys/malloc.h> 59#include <sys/rlist.h> 60#include <machine/segments.h> 61#include <vm/vm.h> 62#include <machine/spl.h> 63#include <i386/isa/isa_device.h> 64#include <i386/isa/isa.h> 65#include <i386/isa/icu.h> 66#include <i386/isa/ic/i8237.h> 67#include <i386/isa/ic/i8042.h> 68 69/* 70** Register definitions for DMA controller 1 (channels 0..3): 71*/ 72#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 73#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 74#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 75#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 76 77/* 78** Register definitions for DMA controller 2 (channels 4..7): 79*/ 80#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 81#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 82#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 83#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 84 85void config_isadev __P((struct isa_device *, u_int *)); 86 87/* 88 * print a conflict message 89 */ 90void 91conflict(dvp, tmpdvp, item, reason, format) 92 struct isa_device *dvp, *tmpdvp; 93 int item; 94 char *reason; 95 char *format; 96{ 97 printf("%s%d not probed due to %s conflict with %s%d at ", 98 dvp->id_driver->name, dvp->id_unit, reason, 99 tmpdvp->id_driver->name, tmpdvp->id_unit); 100 printf(format, item); 101 printf("\n"); 102} 103 104/* 105 * Check to see if things are alread in use, like IRQ's, I/O addresses 106 * and Memory addresses. 107 */ 108int 109haveseen(dvp, tmpdvp) 110 struct isa_device *dvp, *tmpdvp; 111{ 112 int status = 0; 113 114 /* 115 * Only check against devices that have already been found 116 */ 117 if (tmpdvp->id_alive) { 118 /* 119 * Check for I/O address conflict. We can only check the 120 * starting address of the device against the range of the 121 * device that has already been probed since we do not 122 * know how many I/O addresses this device uses. 123 */ 124 if (tmpdvp->id_alive != -1) { 125 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 126 (dvp->id_iobase <= 127 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 128 conflict(dvp, tmpdvp, dvp->id_iobase, 129 "I/O address", "0x%x"); 130 status = 1; 131 } 132 } 133 /* 134 * Check for Memory address conflict. We can check for 135 * range overlap, but it will not catch all cases since the 136 * driver may adjust the msize paramater during probe, for 137 * now we just check that the starting address does not 138 * fall within any allocated region. 139 * XXX could add a second check after the probe for overlap, 140 * since at that time we would know the full range. 141 * XXX KERNBASE is a hack, we should have vaddr in the table! 142 */ 143 if(tmpdvp->id_maddr) { 144 if((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 145 (KERNBASE + dvp->id_maddr <= 146 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 147 conflict(dvp, tmpdvp, dvp->id_maddr, "maddr", 148 "0x%x"); 149 status = 1; 150 } 151 } 152#ifndef COM_MULTIPORT 153 /* 154 * Check for IRQ conflicts. 155 */ 156 if(tmpdvp->id_irq) { 157 if (tmpdvp->id_irq == dvp->id_irq) { 158 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 159 "irq", "%d"); 160 status = 1; 161 } 162 } 163#endif 164 /* 165 * Check for DRQ conflicts. 166 */ 167 if(tmpdvp->id_drq != -1) { 168 if (tmpdvp->id_drq == dvp->id_drq) { 169 conflict(dvp, tmpdvp, dvp->id_drq, 170 "drq", "%d"); 171 status = 1; 172 } 173 } 174 } 175 return (status); 176} 177 178/* 179 * Search through all the isa_devtab_* tables looking for anything that 180 * conflicts with the current device. 181 */ 182int 183haveseen_isadev(dvp) 184 struct isa_device *dvp; 185{ 186 struct isa_device *tmpdvp; 187 int status = 0; 188 189 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 190 status |= haveseen(dvp, tmpdvp); 191 } 192 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 193 status |= haveseen(dvp, tmpdvp); 194 } 195 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 196 status |= haveseen(dvp, tmpdvp); 197 } 198 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 199 status |= haveseen(dvp, tmpdvp); 200 } 201 return(status); 202} 203 204/* 205 * Configure all ISA devices 206 */ 207void 208isa_configure() { 209 struct isa_device *dvp; 210 211 enable_intr(); 212 splhigh(); 213 INTREN(IRQ_SLAVE); 214 printf("Probing for devices on the ISA bus:\n"); 215 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) { 216 if (!haveseen_isadev(dvp)) 217 config_isadev(dvp,&tty_imask); 218 } 219 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) { 220 if (!haveseen_isadev(dvp)) 221 config_isadev(dvp,&bio_imask); 222 } 223 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) { 224 if (!haveseen_isadev(dvp)) 225 config_isadev(dvp,&net_imask); 226 } 227 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) { 228 if (!haveseen_isadev(dvp)) 229 config_isadev(dvp,(u_int *) NULL); 230 } 231 bio_imask |= SWI_CLOCK_MASK; 232 net_imask |= SWI_NET_MASK; 233 tty_imask |= SWI_TTY_MASK; 234 235/* 236 * XXX we should really add the tty device to net_imask when the line is 237 * switched to SLIPDISC, and then remove it when it is switched away from 238 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 239 * of them is running slip. 240 * 241 * XXX actually, blocking all ttys during a splimp doesn't matter so much 242 * with sio because the serial interrupt layer doesn't use tty_imask. Only 243 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 244 * during spltty. 245 */ 246#include "sl.h" 247#if NSL > 0 248 net_imask |= tty_imask; 249 tty_imask = net_imask; 250#endif 251 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 252#ifdef DIAGNOSTIC 253 printf("bio_imask %x tty_imask %x net_imask %x\n", 254 bio_imask, tty_imask, net_imask); 255#endif 256 splnone(); 257} 258 259/* 260 * Configure an ISA device. 261 */ 262void 263config_isadev(isdp, mp) 264 struct isa_device *isdp; 265 u_int *mp; 266{ 267 struct isa_driver *dp = isdp->id_driver; 268 269 if (isdp->id_maddr) { 270 extern u_int atdevbase; 271 272 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 273 isdp->id_maddr += atdevbase; 274 } 275 isdp->id_alive = (*dp->probe)(isdp); 276 if (isdp->id_alive) { 277 /* 278 * Only print the I/O address range if id_alive != -1 279 * Right now this is a temporary fix just for the new 280 * NPX code so that if it finds a 486 that can use trap 281 * 16 it will not report I/O addresses. 282 * Rod Grimes 04/26/94 283 */ 284 printf("%s%d", dp->name, isdp->id_unit); 285 if (isdp->id_alive != -1) { 286 printf(" at 0x%x", isdp->id_iobase); 287 if ((isdp->id_iobase + isdp->id_alive - 1) != 288 isdp->id_iobase) { 289 printf("-0x%x", 290 isdp->id_iobase + 291 isdp->id_alive - 1); 292 } 293 } 294 if(isdp->id_irq) 295 printf(" irq %d", ffs(isdp->id_irq) - 1); 296 if (isdp->id_drq != -1) 297 printf(" drq %d", isdp->id_drq); 298 if (isdp->id_maddr) 299 printf(" maddr 0x%x", kvtop(isdp->id_maddr)); 300 if (isdp->id_msize) 301 printf(" msize %d", isdp->id_msize); 302 if (isdp->id_flags) 303 printf(" flags 0x%x", isdp->id_flags); 304 if (isdp->id_iobase) { 305 if (isdp->id_iobase < 0x100) { 306 printf(" on motherboard\n"); 307 } else { 308 if (isdp->id_iobase >= 0x1000) { 309 printf (" on eisa\n"); 310 } else { 311 printf (" on isa\n"); 312 } 313 } 314 } 315 316 (*dp->attach)(isdp); 317 318 if(isdp->id_irq) { 319 int intrno; 320 321 intrno = ffs(isdp->id_irq)-1; 322 setidt(ICU_OFFSET+intrno, isdp->id_intr, 323 SDT_SYS386IGT, SEL_KPL); 324 if(mp) { 325 INTRMASK(*mp,isdp->id_irq); 326 } 327 INTREN(isdp->id_irq); 328 } 329 } else { 330 printf("%s%d not found", dp->name, isdp->id_unit); 331 if (isdp->id_iobase) { 332 printf(" at 0x%x", isdp->id_iobase); 333 } 334 printf("\n"); 335 } 336} 337 338#define IDTVEC(name) __CONCAT(X,name) 339/* default interrupt vector table entries */ 340typedef void inthand_t(); 341typedef void (*inthand_func_t)(); 342extern inthand_t 343 IDTVEC(intr0), IDTVEC(intr1), IDTVEC(intr2), IDTVEC(intr3), 344 IDTVEC(intr4), IDTVEC(intr5), IDTVEC(intr6), IDTVEC(intr7), 345 IDTVEC(intr8), IDTVEC(intr9), IDTVEC(intr10), IDTVEC(intr11), 346 IDTVEC(intr12), IDTVEC(intr13), IDTVEC(intr14), IDTVEC(intr15); 347 348static inthand_func_t defvec[ICU_LEN] = { 349 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 350 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 351 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 352 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) }; 353 354/* 355 * Fill in default interrupt table (in case of spuruious interrupt 356 * during configuration of kernel, setup interrupt control unit 357 */ 358void 359isa_defaultirq() 360{ 361 int i; 362 363 /* icu vectors */ 364 for (i = 0; i < ICU_LEN; i++) 365 setidt(ICU_OFFSET + i, defvec[i], SDT_SYS386IGT, SEL_KPL); 366 367 /* initialize 8259's */ 368 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 369 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 370 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 371#ifdef AUTO_EOI_1 372 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 373#else 374 outb(IO_ICU1+1, 1); /* 8086 mode */ 375#endif 376 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 377 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 378 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 379 380 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 381 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 382 outb(IO_ICU2+1,2); /* my slave id is 2 */ 383#ifdef AUTO_EOI_2 384 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 385#else 386 outb(IO_ICU2+1,1); /* 8086 mode */ 387#endif 388 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 389 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 390} 391 392/* region of physical memory known to be contiguous */ 393vm_offset_t isaphysmem; 394static caddr_t dma_bounce[8]; /* XXX */ 395static char bounced[8]; /* XXX */ 396#define MAXDMASZ 512 /* XXX */ 397 398/* high byte of address is stored in this port for i-th dma channel */ 399static short dmapageport[8] = 400 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 401 402/* 403 * isa_dmacascade(): program 8237 DMA controller channel to accept 404 * external dma control by a board. 405 */ 406void isa_dmacascade(unsigned chan) 407{ 408 if (chan > 7) 409 panic("isa_dmacascade: impossible request"); 410 411 /* set dma channel mode, and set dma channel mode */ 412 if ((chan & 4) == 0) { 413 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 414 outb(DMA1_SMSK, chan); 415 } else { 416 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 417 outb(DMA2_SMSK, chan & 3); 418 } 419} 420 421/* 422 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 423 * problems by using a bounce buffer. 424 */ 425void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 426{ vm_offset_t phys; 427 int waport; 428 caddr_t newaddr; 429 430 if ( chan > 7 431 || (chan < 4 && nbytes > (1<<16)) 432 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 433 panic("isa_dmastart: impossible request"); 434 435 if (isa_dmarangecheck(addr, nbytes, chan)) { 436 if (dma_bounce[chan] == 0) 437 dma_bounce[chan] = 438 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 439 (caddr_t) isaphysmem + NBPG*chan; 440 bounced[chan] = 1; 441 newaddr = dma_bounce[chan]; 442 *(int *) newaddr = 0; /* XXX */ 443 444 /* copy bounce buffer on write */ 445 if (!(flags & B_READ)) 446 bcopy(addr, newaddr, nbytes); 447 addr = newaddr; 448 } 449 450 /* translate to physical */ 451 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 452 453 if ((chan & 4) == 0) { 454 /* 455 * Program one of DMA channels 0..3. These are 456 * byte mode channels. 457 */ 458 /* set dma channel mode, and reset address ff */ 459 if (flags & B_READ) 460 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 461 else 462 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 463 outb(DMA1_FFC, 0); 464 465 /* send start address */ 466 waport = DMA1_CHN(chan); 467 outb(waport, phys); 468 outb(waport, phys>>8); 469 outb(dmapageport[chan], phys>>16); 470 471 /* send count */ 472 outb(waport + 1, --nbytes); 473 outb(waport + 1, nbytes>>8); 474 475 /* unmask channel */ 476 outb(DMA1_SMSK, chan); 477 } else { 478 /* 479 * Program one of DMA channels 4..7. These are 480 * word mode channels. 481 */ 482 /* set dma channel mode, and reset address ff */ 483 if (flags & B_READ) 484 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 485 else 486 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 487 outb(DMA2_FFC, 0); 488 489 /* send start address */ 490 waport = DMA2_CHN(chan - 4); 491 outb(waport, phys>>1); 492 outb(waport, phys>>9); 493 outb(dmapageport[chan], phys>>16); 494 495 /* send count */ 496 nbytes >>= 1; 497 outb(waport + 2, --nbytes); 498 outb(waport + 2, nbytes>>8); 499 500 /* unmask channel */ 501 outb(DMA2_SMSK, chan & 3); 502 } 503} 504 505void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 506{ 507 508 /* copy bounce buffer on read */ 509 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 510 if (bounced[chan]) { 511 bcopy(dma_bounce[chan], addr, nbytes); 512 bounced[chan] = 0; 513 } 514} 515 516/* 517 * Check for problems with the address range of a DMA transfer 518 * (non-contiguous physical pages, outside of bus address space, 519 * crossing DMA page boundaries). 520 * Return true if special handling needed. 521 */ 522 523int 524isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 525 vm_offset_t phys, priorpage = 0, endva; 526 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 527 528 endva = (vm_offset_t)round_page(va + length); 529 for (; va < (caddr_t) endva ; va += NBPG) { 530 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 531#define ISARAM_END RAM_END 532 if (phys == 0) 533 panic("isa_dmacheck: no physical page present"); 534 if (phys >= ISARAM_END) 535 return (1); 536 if (priorpage) { 537 if (priorpage + NBPG != phys) 538 return (1); 539 /* check if crossing a DMA page boundary */ 540 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 541 return (1); 542 } 543 priorpage = phys; 544 } 545 return (0); 546} 547 548/* head of queue waiting for physmem to become available */ 549struct buf isa_physmemq; 550 551/* blocked waiting for resource to become free for exclusive use */ 552static isaphysmemflag; 553/* if waited for and call requested when free (B_CALL) */ 554static void (*isaphysmemunblock)(); /* needs to be a list */ 555 556/* 557 * Allocate contiguous physical memory for transfer, returning 558 * a *virtual* address to region. May block waiting for resource. 559 * (assumed to be called at splbio()) 560 */ 561caddr_t 562isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 563 564 isaphysmemunblock = func; 565 while (isaphysmemflag & B_BUSY) { 566 isaphysmemflag |= B_WANTED; 567 tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0); 568 } 569 isaphysmemflag |= B_BUSY; 570 571 return((caddr_t)isaphysmem); 572} 573 574/* 575 * Free contiguous physical memory used for transfer. 576 * (assumed to be called at splbio()) 577 */ 578void 579isa_freephysmem(caddr_t va, unsigned length) { 580 581 isaphysmemflag &= ~B_BUSY; 582 if (isaphysmemflag & B_WANTED) { 583 isaphysmemflag &= B_WANTED; 584 wakeup((caddr_t)&isaphysmemflag); 585 if (isaphysmemunblock) 586 (*isaphysmemunblock)(); 587 } 588} 589 590#define NMI_PARITY (1 << 7) 591#define NMI_IOCHAN (1 << 6) 592#define ENMI_WATCHDOG (1 << 7) 593#define ENMI_BUSTIMER (1 << 6) 594#define ENMI_IOSTATUS (1 << 5) 595 596/* 597 * Handle a NMI, possibly a machine check. 598 * return true to panic system, false to ignore. 599 */ 600int 601isa_nmi(cd) 602 int cd; 603{ 604 int isa_port = inb(0x61); 605 int eisa_port = inb(0x461); 606 if(isa_port & NMI_PARITY) { 607 panic("RAM parity error, likely hardware failure."); 608 } else if(isa_port & NMI_IOCHAN) { 609 panic("I/O channel check, likely hardware failure."); 610 } else if(eisa_port & ENMI_WATCHDOG) { 611 panic("EISA watchdog timer expired, likely hardware failure."); 612 } else if(eisa_port & ENMI_BUSTIMER) { 613 panic("EISA bus timeout, likely hardware failure."); 614 } else if(eisa_port & ENMI_IOSTATUS) { 615 panic("EISA I/O port status error."); 616 } else { 617 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 618 return(0); 619 } 620} 621 622/* 623 * Caught a stray interrupt, notify 624 */ 625void 626isa_strayintr(d) 627 int d; 628{ 629 630 /* DON'T BOTHER FOR NOW! */ 631 /* for some reason, we get bursts of intr #7, even if not enabled! */ 632 /* 633 * Well the reason you got bursts of intr #7 is because someone 634 * raised an interrupt line and dropped it before the 8259 could 635 * prioritize it. This is documented in the intel data book. This 636 * means you have BAD hardware! I have changed this so that only 637 * the first 5 get logged, then it quits logging them, and puts 638 * out a special message. rgrimes 3/25/1993 639 */ 640 extern u_long intrcnt_stray; 641 642 intrcnt_stray++; 643 if (intrcnt_stray <= 5) 644 log(LOG_ERR,"ISA strayintr %x\n", d); 645 if (intrcnt_stray == 5) 646 log(LOG_CRIT,"Too many ISA strayintr not logging any more\n"); 647} 648 649/* 650 * find an ISA device in a given isa_devtab_* table, given 651 * the table to search, the expected id_driver entry, and the unit number. 652 * 653 * this function is defined in isa_device.h, and this location is debatable; 654 * i put it there because it's useless w/o, and directly operates on 655 * the other stuff in that file. 656 * 657 */ 658 659struct isa_device *find_isadev(table, driverp, unit) 660 struct isa_device *table; 661 struct isa_driver *driverp; 662 int unit; 663{ 664 if (driverp == NULL) /* sanity check */ 665 return NULL; 666 667 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 668 if (table->id_driver == 0) 669 return NULL; 670 671 table++; 672 } 673 674 return table; 675} 676 677/* 678 * Return nonzero if a (masked) irq is pending for a given device. 679 */ 680int 681isa_irq_pending(dvp) 682 struct isa_device *dvp; 683{ 684 unsigned id_irq; 685 686 id_irq = (unsigned short) dvp->id_irq; /* XXX silly type in struct */ 687 if (id_irq & 0xff) 688 return (inb(IO_ICU1) & id_irq); 689 return (inb(IO_ICU2) & (id_irq >> 8)); 690} 691