isa.c revision 7645
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 1.43 1995/04/04 22:48:40 ache 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/proc.h> 54#include <sys/conf.h> 55#include <sys/file.h> 56#include <sys/buf.h> 57#include <sys/uio.h> 58#include <sys/syslog.h> 59#include <sys/malloc.h> 60#include <sys/rlist.h> 61#include <machine/segments.h> 62#include <vm/vm.h> 63#include <machine/spl.h> 64#include <i386/isa/isa_device.h> 65#include <i386/isa/isa.h> 66#include <i386/isa/icu.h> 67#include <i386/isa/ic/i8237.h> 68#include <i386/isa/ic/i8042.h> 69#include <sys/devconf.h> 70#include "vector.h" 71 72/* 73** Register definitions for DMA controller 1 (channels 0..3): 74*/ 75#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 76#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 77#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 78#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 79 80/* 81** Register definitions for DMA controller 2 (channels 4..7): 82*/ 83#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 84#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 85#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 86#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 87 88/* 89 * Bits to specify the type and amount of conflict checking. 90 */ 91#define CC_ATTACH (1 << 0) 92#define CC_DRQ (1 << 1) 93#define CC_IOADDR (1 << 2) 94#define CC_IRQ (1 << 3) 95#define CC_MEMADDR (1 << 4) 96 97/* 98 * XXX these defines should be in a central place. 99 */ 100#define read_eflags() ({u_long ef; \ 101 __asm("pushfl; popl %0" : "=a" (ef)); \ 102 ef; }) 103#define write_eflags(ef) __asm("pushl %0; popfl" : : "a" ((u_long)(ef))) 104 105u_long *intr_countp[ICU_LEN]; 106inthand2_t *intr_handler[ICU_LEN]; 107u_int intr_mask[ICU_LEN]; 108u_int* intr_mptr[ICU_LEN]; 109int intr_unit[ICU_LEN]; 110 111struct kern_devconf kdc_isa0 = { 112 0, 0, 0, /* filled in by dev_attach */ 113 "isa", 0, { MDDT_BUS, 0 }, 114 0, 0, 0, BUS_EXTERNALLEN, 115 0, /* no parent yet; parent should be CPU */ 116 0, /* no parentdata */ 117 DC_BUSY, /* busses are always busy */ 118 "ISA or EISA bus" 119}; 120 121static inthand_t *fastintr[ICU_LEN] = { 122 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 123 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 124 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 125 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 126 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 127 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 128 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 129 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 130}; 131 132static inthand_t *slowintr[ICU_LEN] = { 133 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 134 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 135 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 136 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 137}; 138 139static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 140static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 141 int reconfig)); 142static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 143 int item, char const *whatnot, char const *reason, 144 char const *format)); 145static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 146 u_int checkbits)); 147static int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits)); 148static inthand2_t isa_strayintr; 149static void register_imask __P((struct isa_device *dvp, u_int mask)); 150 151/* 152 * print a conflict message 153 */ 154static void 155conflict(dvp, tmpdvp, item, whatnot, reason, format) 156 struct isa_device *dvp; 157 struct isa_device *tmpdvp; 158 int item; 159 char const *whatnot; 160 char const *reason; 161 char const *format; 162{ 163 printf("%s%d not %sed due to %s conflict with %s%d at ", 164 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 165 tmpdvp->id_driver->name, tmpdvp->id_unit); 166 printf(format, item); 167 printf("\n"); 168} 169 170/* 171 * Check to see if things are alread in use, like IRQ's, I/O addresses 172 * and Memory addresses. 173 */ 174static int 175haveseen(dvp, tmpdvp, checkbits) 176 struct isa_device *dvp; 177 struct isa_device *tmpdvp; 178 u_int checkbits; 179{ 180 /* 181 * Only check against devices that have already been found 182 */ 183 if (tmpdvp->id_alive) { 184 char const *whatnot; 185 186 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 187 /* 188 * Check for I/O address conflict. We can only check the 189 * starting address of the device against the range of the 190 * device that has already been probed since we do not 191 * know how many I/O addresses this device uses. 192 */ 193 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 194 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 195 (dvp->id_iobase <= 196 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 197 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 198 "I/O address", "0x%x"); 199 return 1; 200 } 201 } 202 /* 203 * Check for Memory address conflict. We can check for 204 * range overlap, but it will not catch all cases since the 205 * driver may adjust the msize paramater during probe, for 206 * now we just check that the starting address does not 207 * fall within any allocated region. 208 * XXX could add a second check after the probe for overlap, 209 * since at that time we would know the full range. 210 * XXX KERNBASE is a hack, we should have vaddr in the table! 211 */ 212 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 213 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 214 (KERNBASE + dvp->id_maddr <= 215 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 216 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 217 whatnot, "maddr", "0x%x"); 218 return 1; 219 } 220 } 221 /* 222 * Check for IRQ conflicts. 223 */ 224 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 225 if (tmpdvp->id_irq == dvp->id_irq) { 226 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 227 whatnot, "irq", "%d"); 228 return 1; 229 } 230 } 231 /* 232 * Check for DRQ conflicts. 233 */ 234 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 235 if (tmpdvp->id_drq == dvp->id_drq) { 236 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 237 "drq", "%d"); 238 return 1; 239 } 240 } 241 } 242 return 0; 243} 244 245/* 246 * Search through all the isa_devtab_* tables looking for anything that 247 * conflicts with the current device. 248 */ 249static int 250haveseen_isadev(dvp, checkbits) 251 struct isa_device *dvp; 252 u_int checkbits; 253{ 254 struct isa_device *tmpdvp; 255 int status = 0; 256 257 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 258 status |= haveseen(dvp, tmpdvp, checkbits); 259 if (status) 260 return status; 261 } 262 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 263 status |= haveseen(dvp, tmpdvp, checkbits); 264 if (status) 265 return status; 266 } 267 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 268 status |= haveseen(dvp, tmpdvp, checkbits); 269 if (status) 270 return status; 271 } 272 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 273 status |= haveseen(dvp, tmpdvp, checkbits); 274 if (status) 275 return status; 276 } 277 return(status); 278} 279 280/* 281 * Configure all ISA devices 282 */ 283void 284isa_configure() { 285 struct isa_device *dvp; 286 287 dev_attach(&kdc_isa0); 288 289 splhigh(); 290 enable_intr(); 291 INTREN(IRQ_SLAVE); 292 printf("Probing for devices on the ISA bus:\n"); 293 /* First probe all the sensitive probes */ 294 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 295 if (dvp->id_driver->sensitive_hw) 296 config_isadev(dvp, &tty_imask); 297 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 298 if (dvp->id_driver->sensitive_hw) 299 config_isadev(dvp, &bio_imask); 300 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 301 if (dvp->id_driver->sensitive_hw) 302 config_isadev(dvp, &net_imask); 303 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 304 if (dvp->id_driver->sensitive_hw) 305 config_isadev(dvp, (u_int *)NULL); 306 307 /* Then all the bad ones */ 308 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 309 if (!dvp->id_driver->sensitive_hw) 310 config_isadev(dvp, &tty_imask); 311 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 312 if (!dvp->id_driver->sensitive_hw) 313 config_isadev(dvp, &bio_imask); 314 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 315 if (!dvp->id_driver->sensitive_hw) 316 config_isadev(dvp, &net_imask); 317 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 318 if (!dvp->id_driver->sensitive_hw) 319 config_isadev(dvp, (u_int *)NULL); 320 321 bio_imask |= SWI_CLOCK_MASK; 322 net_imask |= SWI_NET_MASK; 323 tty_imask |= SWI_TTY_MASK; 324 325/* 326 * XXX we should really add the tty device to net_imask when the line is 327 * switched to SLIPDISC, and then remove it when it is switched away from 328 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 329 * of them is running slip. 330 * 331 * XXX actually, blocking all ttys during a splimp doesn't matter so much 332 * with sio because the serial interrupt layer doesn't use tty_imask. Only 333 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 334 * during spltty. 335 */ 336#include "sl.h" 337#include "ppp.h" 338 339#if (NSL > 0) || (NPPP > 0) 340 net_imask |= tty_imask; 341 tty_imask = net_imask; 342#endif 343 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 344#ifdef DIAGNOSTIC 345 printf("bio_imask %x tty_imask %x net_imask %x\n", 346 bio_imask, tty_imask, net_imask); 347#endif 348 /* 349 * Finish initializing intr_mask[]. Note that the partly 350 * constructed masks aren't actually used since we're at splhigh. 351 * For fully dynamic initialization, register_intr() and 352 * unregister_intr() will have to adjust the masks for _all_ 353 * interrupts and for tty_imask, etc. 354 */ 355 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 356 register_imask(dvp, tty_imask); 357 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 358 register_imask(dvp, bio_imask); 359 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 360 register_imask(dvp, net_imask); 361 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 362 register_imask(dvp, SWI_CLOCK_MASK); 363 spl0(); 364} 365 366/* 367 * Configure an ISA device. 368 */ 369 370 371static void 372config_isadev(isdp, mp) 373 struct isa_device *isdp; 374 u_int *mp; 375{ 376 config_isadev_c(isdp, mp, 0); 377} 378 379void 380reconfig_isadev(isdp, mp) 381 struct isa_device *isdp; 382 u_int *mp; 383{ 384 config_isadev_c(isdp, mp, 1); 385} 386 387static void 388config_isadev_c(isdp, mp, reconfig) 389 struct isa_device *isdp; 390 u_int *mp; 391 int reconfig; 392{ 393 u_int checkbits; 394 int id_alive; 395 int last_alive; 396 struct isa_driver *dp = isdp->id_driver; 397 398 checkbits = 0; 399#ifndef ALLOW_CONFLICT_DRQ 400 checkbits |= CC_DRQ; 401#endif 402#ifndef ALLOW_CONFLICT_IOADDR 403 checkbits |= CC_IOADDR; 404#endif 405#ifndef ALLOW_CONFLICT_MEMADDR 406 checkbits |= CC_MEMADDR; 407#endif 408 if (!isdp->id_enabled) { 409 printf("%s%d: disabled, not probed.\n", 410 dp->name, isdp->id_unit); 411 return; 412 } 413 if (!reconfig && haveseen_isadev(isdp, checkbits)) 414 return; 415 if (!reconfig && isdp->id_maddr) { 416 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 417 isdp->id_maddr += atdevbase; 418 } 419 if (reconfig) { 420 last_alive = isdp->id_alive; 421 isdp->id_reconfig = 1; 422 } 423 else { 424 last_alive = 0; 425 isdp->id_reconfig = 0; 426 } 427 id_alive = (*dp->probe)(isdp); 428 if (id_alive) { 429 /* 430 * Only print the I/O address range if id_alive != -1 431 * Right now this is a temporary fix just for the new 432 * NPX code so that if it finds a 486 that can use trap 433 * 16 it will not report I/O addresses. 434 * Rod Grimes 04/26/94 435 */ 436 if (!isdp->id_reconfig) { 437 printf("%s%d", dp->name, isdp->id_unit); 438 if (id_alive != -1) { 439 printf(" at 0x%x", isdp->id_iobase); 440 if ((isdp->id_iobase + id_alive - 1) != 441 isdp->id_iobase) { 442 printf("-0x%x", 443 isdp->id_iobase + id_alive - 1); 444 } 445 } 446 if (isdp->id_irq) 447 printf(" irq %d", ffs(isdp->id_irq) - 1); 448 if (isdp->id_drq != -1) 449 printf(" drq %d", isdp->id_drq); 450 if (isdp->id_maddr) 451 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 452 if (isdp->id_msize) 453 printf(" msize %d", isdp->id_msize); 454 if (isdp->id_flags) 455 printf(" flags 0x%x", isdp->id_flags); 456 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 457 printf(" on motherboard"); 458 } else if (isdp->id_iobase >= 0x1000 && 459 !(isdp->id_iobase & 0x300)) { 460 printf (" on eisa slot %d", 461 isdp->id_iobase >> 12); 462 } else { 463 printf (" on isa"); 464 } 465 printf("\n"); 466 /* 467 * Check for conflicts again. The driver may have 468 * changed *dvp. We should weaken the early check 469 * since the driver may have been able to change 470 * *dvp to avoid conflicts if given a chance. We 471 * already skip the early check for IRQs and force 472 * a check for IRQs in the next group of checks. 473 */ 474#ifndef ALLOW_CONFLICT_IRQ 475 checkbits |= CC_IRQ; 476#endif 477 if (haveseen_isadev(isdp, checkbits)) 478 return; 479 isdp->id_alive = id_alive; 480 } 481 (*dp->attach)(isdp); 482 if (isdp->id_irq) { 483 if (mp) 484 INTRMASK(*mp, isdp->id_irq); 485 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 486 isdp->id_ri_flags, isdp->id_intr, 487 mp, isdp->id_unit); 488 INTREN(isdp->id_irq); 489 } 490 } else { 491 if (isdp->id_reconfig) { 492 (*dp->attach)(isdp); /* reconfiguration attach */ 493 } 494 if (!last_alive) { 495 if (!isdp->id_reconfig) { 496 printf("%s%d not found", dp->name, isdp->id_unit); 497 if (isdp->id_iobase) { 498 printf(" at 0x%x", isdp->id_iobase); 499 } 500 printf("\n"); 501 } 502 } 503 else { 504 /* This code has not been tested.... */ 505 if (isdp->id_irq) { 506 INTRDIS(isdp->id_irq); 507 unregister_intr(ffs(isdp->id_irq) - 1, 508 isdp->id_intr); 509 if (mp) 510 INTRUNMASK(*mp, isdp->id_irq); 511 } 512 } 513 } 514} 515 516/* 517 * Provide ISA-specific device information to user programs using the 518 * hw.devconf interface. 519 */ 520int 521isa_externalize(struct isa_device *id, void *userp, size_t *maxlen) 522{ 523 if(*maxlen < sizeof *id) { 524 return ENOMEM; 525 } 526 527 *maxlen -= sizeof *id; 528 return copyout(id, userp, sizeof *id); 529} 530 531/* 532 * Do the same thing for EISA information. EISA information is currently 533 * the same as ISA information plus a slot number, but could be extended in 534 * the future. 535 */ 536int 537eisa_externalize(struct isa_device *id, int slot, void *userp, size_t *maxlen) 538{ 539 int rv; 540 541 if(*maxlen < (sizeof *id) + (sizeof slot)) { 542 return ENOMEM; 543 } 544 *maxlen -= (sizeof *id) + (sizeof slot); 545 546 rv = copyout(id, userp, sizeof *id); 547 if(rv) return rv; 548 549 return copyout(&slot, (char *)userp + sizeof *id, sizeof slot); 550} 551 552/* 553 * This is used to forcibly reconfigure an ISA device. It currently just 554 * returns an error 'cos you can't do that yet. It is here to demonstrate 555 * what the `internalize' routine is supposed to do. 556 */ 557int 558isa_internalize(struct isa_device *id, void **userpp, size_t *len) 559{ 560 struct isa_device myid; 561 char *userp = *userpp; 562 int rv; 563 564 if(*len < sizeof *id) { 565 return EINVAL; 566 } 567 568 rv = copyin(userp, &myid, sizeof myid); 569 if(rv) return rv; 570 *userpp = userp + sizeof myid; 571 *len -= sizeof myid; 572 573 rv = EOPNOTSUPP; 574 /* code would go here to validate the configuration request */ 575 /* code would go here to actually perform the reconfiguration */ 576 return rv; 577} 578 579int 580isa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 581 void *userp, size_t l) 582{ 583 return isa_externalize(kdc->kdc_isa, userp, &l); 584} 585 586int 587eisa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 588 void *userp, size_t l) 589{ 590 return eisa_externalize(kdc->kdc_isa, -1, userp, &l); 591} 592 593/* 594 * Fill in default interrupt table (in case of spuruious interrupt 595 * during configuration of kernel, setup interrupt control unit 596 */ 597void 598isa_defaultirq() 599{ 600 int i; 601 602 /* icu vectors */ 603 for (i = 0; i < ICU_LEN; i++) 604 unregister_intr(i, (inthand2_t *)NULL); 605 606 /* initialize 8259's */ 607 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 608 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 609 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 610#ifdef AUTO_EOI_1 611 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 612#else 613 outb(IO_ICU1+1, 1); /* 8086 mode */ 614#endif 615 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 616 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 617 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 618 619 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 620 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 621 outb(IO_ICU2+1,2); /* my slave id is 2 */ 622#ifdef AUTO_EOI_2 623 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 624#else 625 outb(IO_ICU2+1,1); /* 8086 mode */ 626#endif 627 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 628 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 629} 630 631/* region of physical memory known to be contiguous */ 632vm_offset_t isaphysmem; 633static caddr_t dma_bounce[8]; /* XXX */ 634static char bounced[8]; /* XXX */ 635#define MAXDMASZ 512 /* XXX */ 636 637/* high byte of address is stored in this port for i-th dma channel */ 638static short dmapageport[8] = 639 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 640 641/* 642 * isa_dmacascade(): program 8237 DMA controller channel to accept 643 * external dma control by a board. 644 */ 645void isa_dmacascade(unsigned chan) 646{ 647 if (chan > 7) 648 panic("isa_dmacascade: impossible request"); 649 650 /* set dma channel mode, and set dma channel mode */ 651 if ((chan & 4) == 0) { 652 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 653 outb(DMA1_SMSK, chan); 654 } else { 655 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 656 outb(DMA2_SMSK, chan & 3); 657 } 658} 659 660static int 661isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); 662 663/* 664 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 665 * problems by using a bounce buffer. 666 */ 667void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 668{ vm_offset_t phys; 669 int waport; 670 caddr_t newaddr; 671 672 if ( chan > 7 673 || (chan < 4 && nbytes > (1<<16)) 674 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 675 panic("isa_dmastart: impossible request"); 676 677 if (isa_dmarangecheck(addr, nbytes, chan)) { 678 if (dma_bounce[chan] == 0) 679 dma_bounce[chan] = 680 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 681 (caddr_t) isaphysmem + NBPG*chan; 682 bounced[chan] = 1; 683 newaddr = dma_bounce[chan]; 684 *(int *) newaddr = 0; /* XXX */ 685 686 /* copy bounce buffer on write */ 687 if (!(flags & B_READ)) 688 bcopy(addr, newaddr, nbytes); 689 addr = newaddr; 690 } 691 692 /* translate to physical */ 693 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 694 695 if ((chan & 4) == 0) { 696 /* 697 * Program one of DMA channels 0..3. These are 698 * byte mode channels. 699 */ 700 /* set dma channel mode, and reset address ff */ 701 702 /* If B_RAW flag is set, then use autoinitialise mode */ 703 if (flags & B_RAW) { 704 if (flags & B_READ) 705 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 706 else 707 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 708 } 709 else 710 if (flags & B_READ) 711 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 712 else 713 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 714 outb(DMA1_FFC, 0); 715 716 /* send start address */ 717 waport = DMA1_CHN(chan); 718 outb(waport, phys); 719 outb(waport, phys>>8); 720 outb(dmapageport[chan], phys>>16); 721 722 /* send count */ 723 outb(waport + 1, --nbytes); 724 outb(waport + 1, nbytes>>8); 725 726 /* unmask channel */ 727 outb(DMA1_SMSK, chan); 728 } else { 729 /* 730 * Program one of DMA channels 4..7. These are 731 * word mode channels. 732 */ 733 /* set dma channel mode, and reset address ff */ 734 735 /* If B_RAW flag is set, then use autoinitialise mode */ 736 if (flags & B_RAW) { 737 if (flags & B_READ) 738 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 739 else 740 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 741 } 742 else 743 if (flags & B_READ) 744 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 745 else 746 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 747 outb(DMA2_FFC, 0); 748 749 /* send start address */ 750 waport = DMA2_CHN(chan - 4); 751 outb(waport, phys>>1); 752 outb(waport, phys>>9); 753 outb(dmapageport[chan], phys>>16); 754 755 /* send count */ 756 nbytes >>= 1; 757 outb(waport + 2, --nbytes); 758 outb(waport + 2, nbytes>>8); 759 760 /* unmask channel */ 761 outb(DMA2_SMSK, chan & 3); 762 } 763} 764 765void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 766{ 767 768 /* copy bounce buffer on read */ 769 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 770 if (bounced[chan]) { 771 bcopy(dma_bounce[chan], addr, nbytes); 772 bounced[chan] = 0; 773 } 774} 775 776/* 777 * Check for problems with the address range of a DMA transfer 778 * (non-contiguous physical pages, outside of bus address space, 779 * crossing DMA page boundaries). 780 * Return true if special handling needed. 781 */ 782 783static int 784isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 785 vm_offset_t phys, priorpage = 0, endva; 786 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 787 788 endva = (vm_offset_t)round_page(va + length); 789 for (; va < (caddr_t) endva ; va += NBPG) { 790 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 791#define ISARAM_END RAM_END 792 if (phys == 0) 793 panic("isa_dmacheck: no physical page present"); 794 if (phys >= ISARAM_END) 795 return (1); 796 if (priorpage) { 797 if (priorpage + NBPG != phys) 798 return (1); 799 /* check if crossing a DMA page boundary */ 800 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 801 return (1); 802 } 803 priorpage = phys; 804 } 805 return (0); 806} 807 808/* head of queue waiting for physmem to become available */ 809struct buf isa_physmemq; 810 811/* blocked waiting for resource to become free for exclusive use */ 812static isaphysmemflag; 813/* if waited for and call requested when free (B_CALL) */ 814static void (*isaphysmemunblock)(); /* needs to be a list */ 815 816/* 817 * Allocate contiguous physical memory for transfer, returning 818 * a *virtual* address to region. May block waiting for resource. 819 * (assumed to be called at splbio()) 820 */ 821caddr_t 822isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 823 824 isaphysmemunblock = func; 825 while (isaphysmemflag & B_BUSY) { 826 isaphysmemflag |= B_WANTED; 827 tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0); 828 } 829 isaphysmemflag |= B_BUSY; 830 831 return((caddr_t)isaphysmem); 832} 833 834/* 835 * Free contiguous physical memory used for transfer. 836 * (assumed to be called at splbio()) 837 */ 838void 839isa_freephysmem(caddr_t va, unsigned length) { 840 841 isaphysmemflag &= ~B_BUSY; 842 if (isaphysmemflag & B_WANTED) { 843 isaphysmemflag &= B_WANTED; 844 wakeup((caddr_t)&isaphysmemflag); 845 if (isaphysmemunblock) 846 (*isaphysmemunblock)(); 847 } 848} 849 850#define NMI_PARITY (1 << 7) 851#define NMI_IOCHAN (1 << 6) 852#define ENMI_WATCHDOG (1 << 7) 853#define ENMI_BUSTIMER (1 << 6) 854#define ENMI_IOSTATUS (1 << 5) 855 856/* 857 * Handle a NMI, possibly a machine check. 858 * return true to panic system, false to ignore. 859 */ 860int 861isa_nmi(cd) 862 int cd; 863{ 864 int isa_port = inb(0x61); 865 int eisa_port = inb(0x461); 866 if(isa_port & NMI_PARITY) { 867 panic("RAM parity error, likely hardware failure."); 868 } else if(isa_port & NMI_IOCHAN) { 869 panic("I/O channel check, likely hardware failure."); 870 } else if(eisa_port & ENMI_WATCHDOG) { 871 panic("EISA watchdog timer expired, likely hardware failure."); 872 } else if(eisa_port & ENMI_BUSTIMER) { 873 panic("EISA bus timeout, likely hardware failure."); 874 } else if(eisa_port & ENMI_IOSTATUS) { 875 panic("EISA I/O port status error."); 876 } else { 877 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 878 return(0); 879 } 880} 881 882/* 883 * Caught a stray interrupt, notify 884 */ 885static void 886isa_strayintr(d) 887 int d; 888{ 889 890 /* DON'T BOTHER FOR NOW! */ 891 /* for some reason, we get bursts of intr #7, even if not enabled! */ 892 /* 893 * Well the reason you got bursts of intr #7 is because someone 894 * raised an interrupt line and dropped it before the 8259 could 895 * prioritize it. This is documented in the intel data book. This 896 * means you have BAD hardware! I have changed this so that only 897 * the first 5 get logged, then it quits logging them, and puts 898 * out a special message. rgrimes 3/25/1993 899 */ 900 /* 901 * XXX TODO print a different message for #7 if it is for a 902 * glitch. Glitches can be distinguished from real #7's by 903 * testing that the in-service bit is _not_ set. The test 904 * must be done before sending an EOI so it can't be done if 905 * we are using AUTO_EOI_1. 906 */ 907 if (intrcnt[NR_DEVICES + d] <= 5) 908 log(LOG_ERR, "stray irq %d\n", d); 909 if (intrcnt[NR_DEVICES + d] == 5) 910 log(LOG_CRIT, 911 "too many stray irq %d's; not logging any more\n", d); 912} 913 914/* 915 * find an ISA device in a given isa_devtab_* table, given 916 * the table to search, the expected id_driver entry, and the unit number. 917 * 918 * this function is defined in isa_device.h, and this location is debatable; 919 * i put it there because it's useless w/o, and directly operates on 920 * the other stuff in that file. 921 * 922 */ 923 924struct isa_device *find_isadev(table, driverp, unit) 925 struct isa_device *table; 926 struct isa_driver *driverp; 927 int unit; 928{ 929 if (driverp == NULL) /* sanity check */ 930 return NULL; 931 932 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 933 if (table->id_driver == 0) 934 return NULL; 935 936 table++; 937 } 938 939 return table; 940} 941 942/* 943 * Return nonzero if a (masked) irq is pending for a given device. 944 */ 945int 946isa_irq_pending(dvp) 947 struct isa_device *dvp; 948{ 949 unsigned id_irq; 950 951 id_irq = dvp->id_irq; 952 if (id_irq & 0xff) 953 return (inb(IO_ICU1) & id_irq); 954 return (inb(IO_ICU2) & (id_irq >> 8)); 955} 956 957int 958update_intr_masks(void) 959{ 960 int intr, n=0; 961 u_int mask,*maskptr; 962 for (intr=0; intr < ICU_LEN; intr ++) { 963 if (intr==2) continue; 964 maskptr = intr_mptr[intr]; 965 if (!maskptr) continue; 966 mask = *maskptr; 967 if (mask != intr_mask[intr]) { 968#if 0 969 printf ("intr_mask[%2d] old=%08x new=%08x ptr=%p.\n", 970 intr, intr_mask[intr], mask, maskptr); 971#endif 972 intr_mask[intr]=mask; 973 n++; 974 } 975 976 } 977 return (n); 978} 979 980int 981register_intr(intr, device_id, flags, handler, maskptr, unit) 982 int intr; 983 int device_id; 984 u_int flags; 985 inthand2_t *handler; 986 u_int *maskptr; 987 int unit; 988{ 989 char *cp; 990 u_long ef; 991 int id; 992 u_int mask = (maskptr ? *maskptr : 0); 993 994 if ((u_int)intr >= ICU_LEN || intr == 2 995 || (u_int)device_id >= NR_DEVICES) 996 return (EINVAL); 997 if (intr_handler[intr] != isa_strayintr) 998 return (EBUSY); 999 ef = read_eflags(); 1000 disable_intr(); 1001 intr_countp[intr] = &intrcnt[device_id]; 1002 intr_handler[intr] = handler; 1003 intr_mptr[intr] = maskptr; 1004 intr_mask[intr] = mask | (1 << intr); 1005 intr_unit[intr] = unit; 1006 setidt(ICU_OFFSET + intr, 1007 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 1008 SDT_SYS386IGT, SEL_KPL); 1009 write_eflags(ef); 1010 for (cp = intrnames, id = 0; id <= device_id; id++) 1011 while (*cp++ != '\0') 1012 ; 1013 if (cp > eintrnames) 1014 return (0); 1015 if (intr < 10) { 1016 cp[-3] = intr + '0'; 1017 cp[-2] = ' '; 1018 } else { 1019 cp[-3] = '1'; 1020 cp[-2] = intr - 10 + '0'; 1021 } 1022 return (0); 1023} 1024 1025static void 1026register_imask(dvp, mask) 1027 struct isa_device *dvp; 1028 u_int mask; 1029{ 1030 if (dvp->id_alive && dvp->id_irq) { 1031 int intr; 1032 1033 intr = ffs(dvp->id_irq) - 1; 1034 intr_mask[intr] = mask | (1 <<intr); 1035 } 1036 (void) update_intr_masks(); 1037} 1038 1039int 1040unregister_intr(intr, handler) 1041 int intr; 1042 inthand2_t *handler; 1043{ 1044 u_long ef; 1045 1046 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 1047 return (EINVAL); 1048 ef = read_eflags(); 1049 disable_intr(); 1050 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 1051 intr_handler[intr] = isa_strayintr; 1052 intr_mptr[intr] = NULL; 1053 intr_mask[intr] = HWI_MASK | SWI_MASK; 1054 intr_unit[intr] = intr; 1055 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); 1056 write_eflags(ef); 1057 return (0); 1058} 1059