isa.c revision 2103
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 1.20 1994/08/13 03:50:07 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#include "vector.h" 69 70/* 71** Register definitions for DMA controller 1 (channels 0..3): 72*/ 73#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 74#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 75#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 76#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 77 78/* 79** Register definitions for DMA controller 2 (channels 4..7): 80*/ 81#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 82#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 83#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 84#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 85 86/* 87 * Bits to specify the type and amount of conflict checking. 88 */ 89#define CC_ATTACH (1 << 0) 90#define CC_DRQ (1 << 1) 91#define CC_IOADDR (1 << 2) 92#define CC_IRQ (1 << 3) 93#define CC_MEMADDR (1 << 4) 94 95/* 96 * XXX these defines should be in a central place. 97 */ 98#define read_eflags() ({u_long ef; \ 99 __asm("pushfl; popl %0" : "=a" (ef)); \ 100 ef; }) 101#define write_eflags(ef) __asm("pushl %0; popfl" : : "a" ((u_long)(ef))) 102 103u_long *intr_countp[ICU_LEN]; 104inthand2_t *intr_handler[ICU_LEN]; 105u_int intr_mask[ICU_LEN]; 106int intr_unit[ICU_LEN]; 107 108static inthand_t *fastintr[ICU_LEN] = { 109 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 110 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 111 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 112 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 113 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 114 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 115 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 116 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 117}; 118 119static inthand_t *slowintr[ICU_LEN] = { 120 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 121 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 122 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 123 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 124}; 125 126static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 127static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 128 int item, char const *whatnot, char const *reason, 129 char const *format)); 130static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 131 u_int checkbits)); 132static int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits)); 133static inthand2_t isa_strayintr; 134static void register_imask __P((struct isa_device *dvp, u_int mask)); 135 136/* 137 * print a conflict message 138 */ 139static void 140conflict(dvp, tmpdvp, item, whatnot, reason, format) 141 struct isa_device *dvp; 142 struct isa_device *tmpdvp; 143 int item; 144 char const *whatnot; 145 char const *reason; 146 char const *format; 147{ 148 printf("%s%d not %sed due to %s conflict with %s%d at ", 149 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 150 tmpdvp->id_driver->name, tmpdvp->id_unit); 151 printf(format, item); 152 printf("\n"); 153} 154 155/* 156 * Check to see if things are alread in use, like IRQ's, I/O addresses 157 * and Memory addresses. 158 */ 159static int 160haveseen(dvp, tmpdvp, checkbits) 161 struct isa_device *dvp; 162 struct isa_device *tmpdvp; 163 u_int checkbits; 164{ 165 int status = 0; 166 167 /* 168 * Only check against devices that have already been found 169 */ 170 if (tmpdvp->id_alive) { 171 char const *whatnot; 172 173 whatnot = checkbits & CC_ATTACH ? "attach" : "probe"; 174 /* 175 * Check for I/O address conflict. We can only check the 176 * starting address of the device against the range of the 177 * device that has already been probed since we do not 178 * know how many I/O addresses this device uses. 179 */ 180 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 181 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 182 (dvp->id_iobase <= 183 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 184 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 185 "I/O address", "0x%x"); 186 status = 1; 187 } 188 } 189 /* 190 * Check for Memory address conflict. We can check for 191 * range overlap, but it will not catch all cases since the 192 * driver may adjust the msize paramater during probe, for 193 * now we just check that the starting address does not 194 * fall within any allocated region. 195 * XXX could add a second check after the probe for overlap, 196 * since at that time we would know the full range. 197 * XXX KERNBASE is a hack, we should have vaddr in the table! 198 */ 199 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 200 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 201 (KERNBASE + dvp->id_maddr <= 202 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 203 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 204 whatnot, "maddr", "0x%x"); 205 status = 1; 206 } 207 } 208 /* 209 * Check for IRQ conflicts. 210 */ 211 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 212 if (tmpdvp->id_irq == dvp->id_irq) { 213 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 214 whatnot, "irq", "%d"); 215 status = 1; 216 } 217 } 218 /* 219 * Check for DRQ conflicts. 220 */ 221 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 222 if (tmpdvp->id_drq == dvp->id_drq) { 223 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 224 "drq", "%d"); 225 status = 1; 226 } 227 } 228 } 229 return (status); 230} 231 232/* 233 * Search through all the isa_devtab_* tables looking for anything that 234 * conflicts with the current device. 235 */ 236static int 237haveseen_isadev(dvp, checkbits) 238 struct isa_device *dvp; 239 u_int checkbits; 240{ 241 struct isa_device *tmpdvp; 242 int status = 0; 243 244 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) 245 status |= haveseen(dvp, tmpdvp, checkbits); 246 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) 247 status |= haveseen(dvp, tmpdvp, checkbits); 248 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) 249 status |= haveseen(dvp, tmpdvp, checkbits); 250 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) 251 status |= haveseen(dvp, tmpdvp, checkbits); 252 return(status); 253} 254 255/* 256 * Configure all ISA devices 257 */ 258void 259isa_configure() { 260 struct isa_device *dvp; 261 262 splhigh(); 263 enable_intr(); 264 INTREN(IRQ_SLAVE); 265 printf("Probing for devices on the ISA bus:\n"); 266 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 267 config_isadev(dvp, &tty_imask); 268 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 269 config_isadev(dvp, &bio_imask); 270 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 271 config_isadev(dvp, &net_imask); 272 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 273 config_isadev(dvp, (u_int *)NULL); 274 bio_imask |= SWI_CLOCK_MASK; 275 net_imask |= SWI_NET_MASK; 276 tty_imask |= SWI_TTY_MASK; 277 278/* 279 * XXX we should really add the tty device to net_imask when the line is 280 * switched to SLIPDISC, and then remove it when it is switched away from 281 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 282 * of them is running slip. 283 * 284 * XXX actually, blocking all ttys during a splimp doesn't matter so much 285 * with sio because the serial interrupt layer doesn't use tty_imask. Only 286 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 287 * during spltty. 288 */ 289#include "sl.h" 290#if NSL > 0 291 net_imask |= tty_imask; 292 tty_imask = net_imask; 293#endif 294 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 295#ifdef DIAGNOSTIC 296 printf("bio_imask %x tty_imask %x net_imask %x\n", 297 bio_imask, tty_imask, net_imask); 298#endif 299 /* 300 * Finish initializing intr_mask[]. Note that the partly 301 * constructed masks aren't actually used since we're at splhigh. 302 * For fully dynamic initialization, register_intr() and 303 * unregister_intr() will have to adjust the masks for _all_ 304 * interrupts and for tty_imask, etc. 305 */ 306 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 307 register_imask(dvp, tty_imask); 308 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 309 register_imask(dvp, bio_imask); 310 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 311 register_imask(dvp, net_imask); 312 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 313 register_imask(dvp, SWI_CLOCK_MASK); 314 splnone(); 315} 316 317/* 318 * Configure an ISA device. 319 */ 320static void 321config_isadev(isdp, mp) 322 struct isa_device *isdp; 323 u_int *mp; 324{ 325 u_int checkbits; 326 int id_alive; 327 struct isa_driver *dp = isdp->id_driver; 328 329 checkbits = 0; 330#ifndef ALLOW_CONFLICT_DRQ 331 checkbits |= CC_DRQ; 332#endif 333#ifndef ALLOW_CONFLICT_IOADDR 334 checkbits |= CC_IOADDR; 335#endif 336#ifndef ALLOW_CONFLICT_MEMADDR 337 checkbits |= CC_MEMADDR; 338#endif 339 if (haveseen_isadev(isdp, checkbits)) 340 return; 341 if (isdp->id_maddr) { 342 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 343 isdp->id_maddr += atdevbase; 344 } 345 id_alive = (*dp->probe)(isdp); 346 if (id_alive) { 347 /* 348 * Only print the I/O address range if id_alive != -1 349 * Right now this is a temporary fix just for the new 350 * NPX code so that if it finds a 486 that can use trap 351 * 16 it will not report I/O addresses. 352 * Rod Grimes 04/26/94 353 */ 354 printf("%s%d", dp->name, isdp->id_unit); 355 if (id_alive != -1) { 356 printf(" at 0x%x", isdp->id_iobase); 357 if ((isdp->id_iobase + id_alive - 1) != 358 isdp->id_iobase) { 359 printf("-0x%x", 360 isdp->id_iobase + id_alive - 1); 361 } 362 } 363 if (isdp->id_irq) 364 printf(" irq %d", ffs(isdp->id_irq) - 1); 365 if (isdp->id_drq != -1) 366 printf(" drq %d", isdp->id_drq); 367 if (isdp->id_maddr) 368 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 369 if (isdp->id_msize) 370 printf(" msize %d", isdp->id_msize); 371 if (isdp->id_flags) 372 printf(" flags 0x%x", isdp->id_flags); 373 if (isdp->id_iobase) { 374 if (isdp->id_iobase < 0x100) { 375 printf(" on motherboard\n"); 376 } else { 377 if (isdp->id_iobase >= 0x1000) { 378 printf (" on eisa\n"); 379 } else { 380 printf (" on isa\n"); 381 } 382 } 383 } 384 /* 385 * Check for conflicts again. The driver may have changed 386 * *dvp. We should weaken the early check since the 387 * driver may have been able to change *dvp to avoid 388 * conflicts if given a chance. We already skip the early 389 * check for IRQs and force a check for IRQs in the next 390 * group of checks. 391 */ 392 checkbits |= CC_IRQ; 393 if (haveseen_isadev(isdp, checkbits)) 394 return; 395 isdp->id_alive = id_alive; 396 (*dp->attach)(isdp); 397 if (isdp->id_irq) { 398 if (mp) 399 INTRMASK(*mp, isdp->id_irq); 400 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 401 isdp->id_ri_flags, isdp->id_intr, 402 mp ? *mp : 0, isdp->id_unit); 403 INTREN(isdp->id_irq); 404 } 405 } else { 406 printf("%s%d not found", dp->name, isdp->id_unit); 407 if (isdp->id_iobase) { 408 printf(" at 0x%x", isdp->id_iobase); 409 } 410 printf("\n"); 411 } 412} 413 414/* 415 * Fill in default interrupt table (in case of spuruious interrupt 416 * during configuration of kernel, setup interrupt control unit 417 */ 418void 419isa_defaultirq() 420{ 421 int i; 422 423 /* icu vectors */ 424 for (i = 0; i < ICU_LEN; i++) 425 unregister_intr(i, (inthand2_t *)NULL); 426 427 /* initialize 8259's */ 428 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 429 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 430 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 431#ifdef AUTO_EOI_1 432 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 433#else 434 outb(IO_ICU1+1, 1); /* 8086 mode */ 435#endif 436 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 437 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 438 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 439 440 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 441 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 442 outb(IO_ICU2+1,2); /* my slave id is 2 */ 443#ifdef AUTO_EOI_2 444 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 445#else 446 outb(IO_ICU2+1,1); /* 8086 mode */ 447#endif 448 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 449 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 450} 451 452/* region of physical memory known to be contiguous */ 453vm_offset_t isaphysmem; 454static caddr_t dma_bounce[8]; /* XXX */ 455static char bounced[8]; /* XXX */ 456#define MAXDMASZ 512 /* XXX */ 457 458/* high byte of address is stored in this port for i-th dma channel */ 459static short dmapageport[8] = 460 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 461 462/* 463 * isa_dmacascade(): program 8237 DMA controller channel to accept 464 * external dma control by a board. 465 */ 466void isa_dmacascade(unsigned chan) 467{ 468 if (chan > 7) 469 panic("isa_dmacascade: impossible request"); 470 471 /* set dma channel mode, and set dma channel mode */ 472 if ((chan & 4) == 0) { 473 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 474 outb(DMA1_SMSK, chan); 475 } else { 476 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 477 outb(DMA2_SMSK, chan & 3); 478 } 479} 480 481static int 482isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); 483 484/* 485 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 486 * problems by using a bounce buffer. 487 */ 488void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 489{ vm_offset_t phys; 490 int waport; 491 caddr_t newaddr; 492 493 if ( chan > 7 494 || (chan < 4 && nbytes > (1<<16)) 495 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 496 panic("isa_dmastart: impossible request"); 497 498 if (isa_dmarangecheck(addr, nbytes, chan)) { 499 if (dma_bounce[chan] == 0) 500 dma_bounce[chan] = 501 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 502 (caddr_t) isaphysmem + NBPG*chan; 503 bounced[chan] = 1; 504 newaddr = dma_bounce[chan]; 505 *(int *) newaddr = 0; /* XXX */ 506 507 /* copy bounce buffer on write */ 508 if (!(flags & B_READ)) 509 bcopy(addr, newaddr, nbytes); 510 addr = newaddr; 511 } 512 513 /* translate to physical */ 514 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 515 516 if ((chan & 4) == 0) { 517 /* 518 * Program one of DMA channels 0..3. These are 519 * byte mode channels. 520 */ 521 /* set dma channel mode, and reset address ff */ 522 if (flags & B_READ) 523 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 524 else 525 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 526 outb(DMA1_FFC, 0); 527 528 /* send start address */ 529 waport = DMA1_CHN(chan); 530 outb(waport, phys); 531 outb(waport, phys>>8); 532 outb(dmapageport[chan], phys>>16); 533 534 /* send count */ 535 outb(waport + 1, --nbytes); 536 outb(waport + 1, nbytes>>8); 537 538 /* unmask channel */ 539 outb(DMA1_SMSK, chan); 540 } else { 541 /* 542 * Program one of DMA channels 4..7. These are 543 * word mode channels. 544 */ 545 /* set dma channel mode, and reset address ff */ 546 if (flags & B_READ) 547 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 548 else 549 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 550 outb(DMA2_FFC, 0); 551 552 /* send start address */ 553 waport = DMA2_CHN(chan - 4); 554 outb(waport, phys>>1); 555 outb(waport, phys>>9); 556 outb(dmapageport[chan], phys>>16); 557 558 /* send count */ 559 nbytes >>= 1; 560 outb(waport + 2, --nbytes); 561 outb(waport + 2, nbytes>>8); 562 563 /* unmask channel */ 564 outb(DMA2_SMSK, chan & 3); 565 } 566} 567 568void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 569{ 570 571 /* copy bounce buffer on read */ 572 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 573 if (bounced[chan]) { 574 bcopy(dma_bounce[chan], addr, nbytes); 575 bounced[chan] = 0; 576 } 577} 578 579/* 580 * Check for problems with the address range of a DMA transfer 581 * (non-contiguous physical pages, outside of bus address space, 582 * crossing DMA page boundaries). 583 * Return true if special handling needed. 584 */ 585 586static int 587isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 588 vm_offset_t phys, priorpage = 0, endva; 589 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 590 591 endva = (vm_offset_t)round_page(va + length); 592 for (; va < (caddr_t) endva ; va += NBPG) { 593 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 594#define ISARAM_END RAM_END 595 if (phys == 0) 596 panic("isa_dmacheck: no physical page present"); 597 if (phys >= ISARAM_END) 598 return (1); 599 if (priorpage) { 600 if (priorpage + NBPG != phys) 601 return (1); 602 /* check if crossing a DMA page boundary */ 603 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 604 return (1); 605 } 606 priorpage = phys; 607 } 608 return (0); 609} 610 611/* head of queue waiting for physmem to become available */ 612struct buf isa_physmemq; 613 614/* blocked waiting for resource to become free for exclusive use */ 615static isaphysmemflag; 616/* if waited for and call requested when free (B_CALL) */ 617static void (*isaphysmemunblock)(); /* needs to be a list */ 618 619/* 620 * Allocate contiguous physical memory for transfer, returning 621 * a *virtual* address to region. May block waiting for resource. 622 * (assumed to be called at splbio()) 623 */ 624caddr_t 625isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 626 627 isaphysmemunblock = func; 628 while (isaphysmemflag & B_BUSY) { 629 isaphysmemflag |= B_WANTED; 630 tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0); 631 } 632 isaphysmemflag |= B_BUSY; 633 634 return((caddr_t)isaphysmem); 635} 636 637/* 638 * Free contiguous physical memory used for transfer. 639 * (assumed to be called at splbio()) 640 */ 641void 642isa_freephysmem(caddr_t va, unsigned length) { 643 644 isaphysmemflag &= ~B_BUSY; 645 if (isaphysmemflag & B_WANTED) { 646 isaphysmemflag &= B_WANTED; 647 wakeup((caddr_t)&isaphysmemflag); 648 if (isaphysmemunblock) 649 (*isaphysmemunblock)(); 650 } 651} 652 653#define NMI_PARITY (1 << 7) 654#define NMI_IOCHAN (1 << 6) 655#define ENMI_WATCHDOG (1 << 7) 656#define ENMI_BUSTIMER (1 << 6) 657#define ENMI_IOSTATUS (1 << 5) 658 659/* 660 * Handle a NMI, possibly a machine check. 661 * return true to panic system, false to ignore. 662 */ 663int 664isa_nmi(cd) 665 int cd; 666{ 667 int isa_port = inb(0x61); 668 int eisa_port = inb(0x461); 669 if(isa_port & NMI_PARITY) { 670 panic("RAM parity error, likely hardware failure."); 671 } else if(isa_port & NMI_IOCHAN) { 672 panic("I/O channel check, likely hardware failure."); 673 } else if(eisa_port & ENMI_WATCHDOG) { 674 panic("EISA watchdog timer expired, likely hardware failure."); 675 } else if(eisa_port & ENMI_BUSTIMER) { 676 panic("EISA bus timeout, likely hardware failure."); 677 } else if(eisa_port & ENMI_IOSTATUS) { 678 panic("EISA I/O port status error."); 679 } else { 680 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 681 return(0); 682 } 683} 684 685/* 686 * Caught a stray interrupt, notify 687 */ 688static void 689isa_strayintr(d) 690 int d; 691{ 692 693 /* DON'T BOTHER FOR NOW! */ 694 /* for some reason, we get bursts of intr #7, even if not enabled! */ 695 /* 696 * Well the reason you got bursts of intr #7 is because someone 697 * raised an interrupt line and dropped it before the 8259 could 698 * prioritize it. This is documented in the intel data book. This 699 * means you have BAD hardware! I have changed this so that only 700 * the first 5 get logged, then it quits logging them, and puts 701 * out a special message. rgrimes 3/25/1993 702 */ 703 /* 704 * XXX TODO print a different message for #7 if it is for a 705 * glitch. Glitches can be distinguished from real #7's by 706 * testing that the in-service bit is _not_ set. The test 707 * must be done before sending an EOI so it can't be done if 708 * we are using AUTO_EOI_1. 709 */ 710 if (intrcnt[NR_DEVICES + d] <= 5) 711 log(LOG_ERR, "stray irq %d\n", d); 712 if (intrcnt[NR_DEVICES + d] == 5) 713 log(LOG_CRIT, 714 "too many stray irq %d's; not logging any more\n", d); 715} 716 717/* 718 * find an ISA device in a given isa_devtab_* table, given 719 * the table to search, the expected id_driver entry, and the unit number. 720 * 721 * this function is defined in isa_device.h, and this location is debatable; 722 * i put it there because it's useless w/o, and directly operates on 723 * the other stuff in that file. 724 * 725 */ 726 727struct isa_device *find_isadev(table, driverp, unit) 728 struct isa_device *table; 729 struct isa_driver *driverp; 730 int unit; 731{ 732 if (driverp == NULL) /* sanity check */ 733 return NULL; 734 735 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 736 if (table->id_driver == 0) 737 return NULL; 738 739 table++; 740 } 741 742 return table; 743} 744 745/* 746 * Return nonzero if a (masked) irq is pending for a given device. 747 */ 748int 749isa_irq_pending(dvp) 750 struct isa_device *dvp; 751{ 752 unsigned id_irq; 753 754 id_irq = dvp->id_irq; 755 if (id_irq & 0xff) 756 return (inb(IO_ICU1) & id_irq); 757 return (inb(IO_ICU2) & (id_irq >> 8)); 758} 759 760int 761register_intr(intr, device_id, flags, handler, mask, unit) 762 int intr; 763 int device_id; 764 u_int flags; 765 inthand2_t *handler; 766 u_int mask; 767 int unit; 768{ 769 char *cp; 770 u_long ef; 771 int id; 772 773 if ((u_int)intr >= ICU_LEN || intr == 2 774 || (u_int)device_id >= NR_DEVICES) 775 return (EINVAL); 776 if (intr_handler[intr] != isa_strayintr) 777 return (EBUSY); 778 ef = read_eflags(); 779 disable_intr(); 780 intr_countp[intr] = &intrcnt[device_id]; 781 intr_handler[intr] = handler; 782 intr_mask[intr] = mask | (1 << intr); 783 intr_unit[intr] = unit; 784 setidt(ICU_OFFSET + intr, 785 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 786 SDT_SYS386IGT, SEL_KPL); 787 write_eflags(ef); 788 for (cp = intrnames, id = 0; id <= device_id; id++) 789 while (*cp++ != '\0') 790 ; 791 if (cp > eintrnames) 792 return (0); 793 if (intr < 10) { 794 cp[-3] = intr + '0'; 795 cp[-2] = ' '; 796 } else { 797 cp[-3] = '1'; 798 cp[-2] = intr - 10 + '0'; 799 } 800 return (0); 801} 802 803static void 804register_imask(dvp, mask) 805 struct isa_device *dvp; 806 u_int mask; 807{ 808 if (dvp->id_alive && dvp->id_irq) { 809 int intr; 810 811 intr = ffs(dvp->id_irq) - 1; 812 intr_mask[intr] = mask | (1 <<intr); 813 } 814} 815 816int 817unregister_intr(intr, handler) 818 int intr; 819 inthand2_t *handler; 820{ 821 u_long ef; 822 823 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 824 return (EINVAL); 825 ef = read_eflags(); 826 disable_intr(); 827 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 828 intr_handler[intr] = isa_strayintr; 829 intr_mask[intr] = HWI_MASK | SWI_MASK; 830 intr_unit[intr] = intr; 831 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); 832 write_eflags(ef); 833 return (0); 834} 835