isa.c revision 10666
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 1.50 1995/05/30 08:02:35 rgrimes 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 * XXX these defines should be in a central place. 90 */ 91#define read_eflags() ({u_long ef; \ 92 __asm("pushfl; popl %0" : "=a" (ef)); \ 93 ef; }) 94#define write_eflags(ef) __asm("pushl %0; popfl" : : "a" ((u_long)(ef))) 95 96u_long *intr_countp[ICU_LEN]; 97inthand2_t *intr_handler[ICU_LEN]; 98u_int intr_mask[ICU_LEN]; 99u_int* intr_mptr[ICU_LEN]; 100int intr_unit[ICU_LEN]; 101 102extern struct kern_devconf kdc_cpu0; 103 104struct kern_devconf kdc_isa0 = { 105 0, 0, 0, /* filled in by dev_attach */ 106 "isa", 0, { MDDT_BUS, 0 }, 107 0, 0, 0, BUS_EXTERNALLEN, 108 &kdc_cpu0, /* parent is the CPU */ 109 0, /* no parentdata */ 110 DC_BUSY, /* busses are always busy */ 111 "ISA or EISA bus", 112 DC_CLS_BUS /* class */ 113}; 114 115static inthand_t *fastintr[ICU_LEN] = { 116 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 117 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 118 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 119 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 120 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 121 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 122 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 123 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 124}; 125 126static inthand_t *slowintr[ICU_LEN] = { 127 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 128 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 129 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 130 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 131}; 132 133static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 134static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 135 int reconfig)); 136static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 137 int item, char const *whatnot, char const *reason, 138 char const *format)); 139static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 140 u_int checkbits)); 141static inthand2_t isa_strayintr; 142static void register_imask __P((struct isa_device *dvp, u_int mask)); 143 144/* 145 * print a conflict message 146 */ 147static void 148conflict(dvp, tmpdvp, item, whatnot, reason, format) 149 struct isa_device *dvp; 150 struct isa_device *tmpdvp; 151 int item; 152 char const *whatnot; 153 char const *reason; 154 char const *format; 155{ 156 printf("%s%d not %sed due to %s conflict with %s%d at ", 157 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 158 tmpdvp->id_driver->name, tmpdvp->id_unit); 159 printf(format, item); 160 printf("\n"); 161} 162 163/* 164 * Check to see if things are already in use, like IRQ's, I/O addresses 165 * and Memory addresses. 166 */ 167static int 168haveseen(dvp, tmpdvp, checkbits) 169 struct isa_device *dvp; 170 struct isa_device *tmpdvp; 171 u_int checkbits; 172{ 173 /* 174 * Only check against devices that have already been found and are not 175 * unilaterally allowed to conflict anyway. 176 */ 177 if (tmpdvp->id_alive && !dvp->id_conflicts) { 178 char const *whatnot; 179 180 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 181 /* 182 * Check for I/O address conflict. We can only check the 183 * starting address of the device against the range of the 184 * device that has already been probed since we do not 185 * know how many I/O addresses this device uses. 186 */ 187 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 188 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 189 (dvp->id_iobase <= 190 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 191 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 192 "I/O address", "0x%x"); 193 return 1; 194 } 195 } 196 /* 197 * Check for Memory address conflict. We can check for 198 * range overlap, but it will not catch all cases since the 199 * driver may adjust the msize paramater during probe, for 200 * now we just check that the starting address does not 201 * fall within any allocated region. 202 * XXX could add a second check after the probe for overlap, 203 * since at that time we would know the full range. 204 * XXX KERNBASE is a hack, we should have vaddr in the table! 205 */ 206 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 207 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 208 (KERNBASE + dvp->id_maddr <= 209 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 210 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 211 whatnot, "maddr", "0x%x"); 212 return 1; 213 } 214 } 215 /* 216 * Check for IRQ conflicts. 217 */ 218 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 219 if (tmpdvp->id_irq == dvp->id_irq) { 220 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 221 whatnot, "irq", "%d"); 222 return 1; 223 } 224 } 225 /* 226 * Check for DRQ conflicts. 227 */ 228 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 229 if (tmpdvp->id_drq == dvp->id_drq) { 230 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 231 "drq", "%d"); 232 return 1; 233 } 234 } 235 } 236 return 0; 237} 238 239/* 240 * Search through all the isa_devtab_* tables looking for anything that 241 * conflicts with the current device. 242 */ 243#include "eisa.h" 244#if NEISA > 0 245extern struct isa_device isa_devtab_eisa[]; 246#endif 247 248int 249haveseen_isadev(dvp, checkbits) 250 struct isa_device *dvp; 251 u_int checkbits; 252{ 253 struct isa_device *tmpdvp; 254 int status = 0; 255 256 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 257 status |= haveseen(dvp, tmpdvp, checkbits); 258 if (status) 259 return status; 260 } 261 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 262 status |= haveseen(dvp, tmpdvp, checkbits); 263 if (status) 264 return status; 265 } 266 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 267 status |= haveseen(dvp, tmpdvp, checkbits); 268 if (status) 269 return status; 270 } 271 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 272 status |= haveseen(dvp, tmpdvp, checkbits); 273 if (status) 274 return status; 275 } 276#if NEISA > 0 277 for (tmpdvp = isa_devtab_eisa; tmpdvp->id_driver; tmpdvp++) { 278 status |= haveseen(dvp, tmpdvp, checkbits); 279 if (status) 280 return status; 281 } 282#endif 283 return(status); 284} 285 286/* 287 * Configure all ISA devices 288 */ 289void 290isa_configure() { 291 struct isa_device *dvp; 292 293 dev_attach(&kdc_isa0); 294 295 splhigh(); 296 enable_intr(); 297 INTREN(IRQ_SLAVE); 298 printf("Probing for devices on the ISA bus:\n"); 299 /* First probe all the sensitive probes */ 300 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 301 if (dvp->id_driver->sensitive_hw) 302 config_isadev(dvp, &tty_imask); 303 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 304 if (dvp->id_driver->sensitive_hw) 305 config_isadev(dvp, &bio_imask); 306 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 307 if (dvp->id_driver->sensitive_hw) 308 config_isadev(dvp, &net_imask); 309 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 310 if (dvp->id_driver->sensitive_hw) 311 config_isadev(dvp, (u_int *)NULL); 312 313 /* Then all the bad ones */ 314 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 315 if (!dvp->id_driver->sensitive_hw) 316 config_isadev(dvp, &tty_imask); 317 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 318 if (!dvp->id_driver->sensitive_hw) 319 config_isadev(dvp, &bio_imask); 320 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 321 if (!dvp->id_driver->sensitive_hw) 322 config_isadev(dvp, &net_imask); 323 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 324 if (!dvp->id_driver->sensitive_hw) 325 config_isadev(dvp, (u_int *)NULL); 326 327 bio_imask |= SWI_CLOCK_MASK; 328 net_imask |= SWI_NET_MASK; 329 tty_imask |= SWI_TTY_MASK; 330 331/* 332 * XXX we should really add the tty device to net_imask when the line is 333 * switched to SLIPDISC, and then remove it when it is switched away from 334 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 335 * of them is running slip. 336 * 337 * XXX actually, blocking all ttys during a splimp doesn't matter so much 338 * with sio because the serial interrupt layer doesn't use tty_imask. Only 339 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 340 * during spltty. 341 */ 342#include "sl.h" 343#include "ppp.h" 344 345#if (NSL > 0) || (NPPP > 0) 346 net_imask |= tty_imask; 347 tty_imask = net_imask; 348#endif 349 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 350#ifdef DIAGNOSTIC 351 printf("bio_imask %x tty_imask %x net_imask %x\n", 352 bio_imask, tty_imask, net_imask); 353#endif 354 /* 355 * Finish initializing intr_mask[]. Note that the partly 356 * constructed masks aren't actually used since we're at splhigh. 357 * For fully dynamic initialization, register_intr() and 358 * unregister_intr() will have to adjust the masks for _all_ 359 * interrupts and for tty_imask, etc. 360 */ 361 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 362 register_imask(dvp, tty_imask); 363 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 364 register_imask(dvp, bio_imask); 365 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 366 register_imask(dvp, net_imask); 367 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 368 register_imask(dvp, SWI_CLOCK_MASK); 369 spl0(); 370} 371 372/* 373 * Configure an ISA device. 374 */ 375 376 377static void 378config_isadev(isdp, mp) 379 struct isa_device *isdp; 380 u_int *mp; 381{ 382 config_isadev_c(isdp, mp, 0); 383} 384 385void 386reconfig_isadev(isdp, mp) 387 struct isa_device *isdp; 388 u_int *mp; 389{ 390 config_isadev_c(isdp, mp, 1); 391} 392 393static void 394config_isadev_c(isdp, mp, reconfig) 395 struct isa_device *isdp; 396 u_int *mp; 397 int reconfig; 398{ 399 u_int checkbits; 400 int id_alive; 401 int last_alive; 402 struct isa_driver *dp = isdp->id_driver; 403 404 checkbits = 0; 405 checkbits |= CC_DRQ; 406 checkbits |= CC_IOADDR; 407 checkbits |= CC_MEMADDR; 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 checkbits |= CC_IRQ; 475 if (haveseen_isadev(isdp, checkbits)) 476 return; 477 isdp->id_alive = id_alive; 478 } 479 (*dp->attach)(isdp); 480 if (isdp->id_irq) { 481 if (mp) 482 INTRMASK(*mp, isdp->id_irq); 483 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 484 isdp->id_ri_flags, isdp->id_intr, 485 mp, isdp->id_unit); 486 INTREN(isdp->id_irq); 487 } 488 } else { 489 if (isdp->id_reconfig) { 490 (*dp->attach)(isdp); /* reconfiguration attach */ 491 } 492 if (!last_alive) { 493 if (!isdp->id_reconfig) { 494 printf("%s%d not found", dp->name, isdp->id_unit); 495 if (isdp->id_iobase) { 496 printf(" at 0x%x", isdp->id_iobase); 497 } 498 printf("\n"); 499 } 500 } 501 else { 502 /* This code has not been tested.... */ 503 if (isdp->id_irq) { 504 INTRDIS(isdp->id_irq); 505 unregister_intr(ffs(isdp->id_irq) - 1, 506 isdp->id_intr); 507 if (mp) 508 INTRUNMASK(*mp, isdp->id_irq); 509 } 510 } 511 } 512} 513 514/* 515 * Provide ISA-specific device information to user programs using the 516 * hw.devconf interface. 517 */ 518int 519isa_externalize(struct isa_device *id, void *userp, size_t *maxlen) 520{ 521 if(*maxlen < sizeof *id) { 522 return ENOMEM; 523 } 524 525 *maxlen -= sizeof *id; 526 return copyout(id, userp, sizeof *id); 527} 528 529/* 530 * Do the same thing for EISA information. EISA information is currently 531 * the same as ISA information plus a slot number, but could be extended in 532 * the future. 533 */ 534int 535eisa_externalize(struct isa_device *id, int slot, void *userp, size_t *maxlen) 536{ 537 int rv; 538 539 if(*maxlen < (sizeof *id) + (sizeof slot)) { 540 return ENOMEM; 541 } 542 *maxlen -= (sizeof *id) + (sizeof slot); 543 544 rv = copyout(id, userp, sizeof *id); 545 if(rv) return rv; 546 547 return copyout(&slot, (char *)userp + sizeof *id, sizeof slot); 548} 549 550/* 551 * This is used to forcibly reconfigure an ISA device. It currently just 552 * returns an error 'cos you can't do that yet. It is here to demonstrate 553 * what the `internalize' routine is supposed to do. 554 */ 555int 556isa_internalize(struct isa_device *id, void **userpp, size_t *len) 557{ 558 struct isa_device myid; 559 char *userp = *userpp; 560 int rv; 561 562 if(*len < sizeof *id) { 563 return EINVAL; 564 } 565 566 rv = copyin(userp, &myid, sizeof myid); 567 if(rv) return rv; 568 *userpp = userp + sizeof myid; 569 *len -= sizeof myid; 570 571 rv = EOPNOTSUPP; 572 /* code would go here to validate the configuration request */ 573 /* code would go here to actually perform the reconfiguration */ 574 return rv; 575} 576 577int 578isa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 579 void *userp, size_t l) 580{ 581 return isa_externalize(kdc->kdc_isa, userp, &l); 582} 583 584int 585eisa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 586 void *userp, size_t l) 587{ 588 return eisa_externalize(kdc->kdc_isa, -1, userp, &l); 589} 590 591/* 592 * Fill in default interrupt table (in case of spuruious interrupt 593 * during configuration of kernel, setup interrupt control unit 594 */ 595void 596isa_defaultirq() 597{ 598 int i; 599 600 /* icu vectors */ 601 for (i = 0; i < ICU_LEN; i++) 602 unregister_intr(i, (inthand2_t *)NULL); 603 604 /* initialize 8259's */ 605 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 606 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 607 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 608#ifdef AUTO_EOI_1 609 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 610#else 611 outb(IO_ICU1+1, 1); /* 8086 mode */ 612#endif 613 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 614 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 615 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 616 617 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 618 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 619 outb(IO_ICU2+1,2); /* my slave id is 2 */ 620#ifdef AUTO_EOI_2 621 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 622#else 623 outb(IO_ICU2+1,1); /* 8086 mode */ 624#endif 625 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 626 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 627} 628 629/* region of physical memory known to be contiguous */ 630vm_offset_t isaphysmem; 631static caddr_t dma_bounce[8]; /* XXX */ 632static char bounced[8]; /* XXX */ 633#define MAXDMASZ 512 /* XXX */ 634 635/* high byte of address is stored in this port for i-th dma channel */ 636static short dmapageport[8] = 637 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 638 639/* 640 * isa_dmacascade(): program 8237 DMA controller channel to accept 641 * external dma control by a board. 642 */ 643void isa_dmacascade(unsigned chan) 644{ 645 if (chan > 7) 646 panic("isa_dmacascade: impossible request"); 647 648 /* set dma channel mode, and set dma channel mode */ 649 if ((chan & 4) == 0) { 650 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 651 outb(DMA1_SMSK, chan); 652 } else { 653 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 654 outb(DMA2_SMSK, chan & 3); 655 } 656} 657 658static int 659isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); 660 661/* 662 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 663 * problems by using a bounce buffer. 664 */ 665void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 666{ vm_offset_t phys; 667 int waport; 668 caddr_t newaddr; 669 670 if ( chan > 7 671 || (chan < 4 && nbytes > (1<<16)) 672 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 673 panic("isa_dmastart: impossible request"); 674 675 if (isa_dmarangecheck(addr, nbytes, chan)) { 676 if (dma_bounce[chan] == 0) 677 dma_bounce[chan] = 678 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 679 (caddr_t) isaphysmem + NBPG*chan; 680 bounced[chan] = 1; 681 newaddr = dma_bounce[chan]; 682 *(int *) newaddr = 0; /* XXX */ 683 684 /* copy bounce buffer on write */ 685 if (!(flags & B_READ)) 686 bcopy(addr, newaddr, nbytes); 687 addr = newaddr; 688 } 689 690 /* translate to physical */ 691 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 692 693 if ((chan & 4) == 0) { 694 /* 695 * Program one of DMA channels 0..3. These are 696 * byte mode channels. 697 */ 698 /* set dma channel mode, and reset address ff */ 699 700 /* If B_RAW flag is set, then use autoinitialise mode */ 701 if (flags & B_RAW) { 702 if (flags & B_READ) 703 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 704 else 705 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 706 } 707 else 708 if (flags & B_READ) 709 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 710 else 711 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 712 outb(DMA1_FFC, 0); 713 714 /* send start address */ 715 waport = DMA1_CHN(chan); 716 outb(waport, phys); 717 outb(waport, phys>>8); 718 outb(dmapageport[chan], phys>>16); 719 720 /* send count */ 721 outb(waport + 1, --nbytes); 722 outb(waport + 1, nbytes>>8); 723 724 /* unmask channel */ 725 outb(DMA1_SMSK, chan); 726 } else { 727 /* 728 * Program one of DMA channels 4..7. These are 729 * word mode channels. 730 */ 731 /* set dma channel mode, and reset address ff */ 732 733 /* If B_RAW flag is set, then use autoinitialise mode */ 734 if (flags & B_RAW) { 735 if (flags & B_READ) 736 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 737 else 738 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 739 } 740 else 741 if (flags & B_READ) 742 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 743 else 744 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 745 outb(DMA2_FFC, 0); 746 747 /* send start address */ 748 waport = DMA2_CHN(chan - 4); 749 outb(waport, phys>>1); 750 outb(waport, phys>>9); 751 outb(dmapageport[chan], phys>>16); 752 753 /* send count */ 754 nbytes >>= 1; 755 outb(waport + 2, --nbytes); 756 outb(waport + 2, nbytes>>8); 757 758 /* unmask channel */ 759 outb(DMA2_SMSK, chan & 3); 760 } 761} 762 763void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 764{ 765 766 /* copy bounce buffer on read */ 767 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 768 if (bounced[chan]) { 769 bcopy(dma_bounce[chan], addr, nbytes); 770 bounced[chan] = 0; 771 } 772} 773 774/* 775 * Check for problems with the address range of a DMA transfer 776 * (non-contiguous physical pages, outside of bus address space, 777 * crossing DMA page boundaries). 778 * Return true if special handling needed. 779 */ 780 781static int 782isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 783 vm_offset_t phys, priorpage = 0, endva; 784 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 785 786 endva = (vm_offset_t)round_page(va + length); 787 for (; va < (caddr_t) endva ; va += NBPG) { 788 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 789#define ISARAM_END RAM_END 790 if (phys == 0) 791 panic("isa_dmacheck: no physical page present"); 792 if (phys >= ISARAM_END) 793 return (1); 794 if (priorpage) { 795 if (priorpage + NBPG != phys) 796 return (1); 797 /* check if crossing a DMA page boundary */ 798 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 799 return (1); 800 } 801 priorpage = phys; 802 } 803 return (0); 804} 805 806/* head of queue waiting for physmem to become available */ 807struct buf isa_physmemq; 808 809/* blocked waiting for resource to become free for exclusive use */ 810static isaphysmemflag; 811/* if waited for and call requested when free (B_CALL) */ 812static void (*isaphysmemunblock)(); /* needs to be a list */ 813 814/* 815 * Allocate contiguous physical memory for transfer, returning 816 * a *virtual* address to region. May block waiting for resource. 817 * (assumed to be called at splbio()) 818 */ 819caddr_t 820isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 821 822 isaphysmemunblock = func; 823 while (isaphysmemflag & B_BUSY) { 824 isaphysmemflag |= B_WANTED; 825 tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0); 826 } 827 isaphysmemflag |= B_BUSY; 828 829 return((caddr_t)isaphysmem); 830} 831 832/* 833 * Free contiguous physical memory used for transfer. 834 * (assumed to be called at splbio()) 835 */ 836void 837isa_freephysmem(caddr_t va, unsigned length) { 838 839 isaphysmemflag &= ~B_BUSY; 840 if (isaphysmemflag & B_WANTED) { 841 isaphysmemflag &= B_WANTED; 842 wakeup((caddr_t)&isaphysmemflag); 843 if (isaphysmemunblock) 844 (*isaphysmemunblock)(); 845 } 846} 847 848#define NMI_PARITY (1 << 7) 849#define NMI_IOCHAN (1 << 6) 850#define ENMI_WATCHDOG (1 << 7) 851#define ENMI_BUSTIMER (1 << 6) 852#define ENMI_IOSTATUS (1 << 5) 853 854/* 855 * Handle a NMI, possibly a machine check. 856 * return true to panic system, false to ignore. 857 */ 858int 859isa_nmi(cd) 860 int cd; 861{ 862 int isa_port = inb(0x61); 863 int eisa_port = inb(0x461); 864 if(isa_port & NMI_PARITY) { 865 panic("RAM parity error, likely hardware failure."); 866 } else if(isa_port & NMI_IOCHAN) { 867 panic("I/O channel check, likely hardware failure."); 868 } else if(eisa_port & ENMI_WATCHDOG) { 869 panic("EISA watchdog timer expired, likely hardware failure."); 870 } else if(eisa_port & ENMI_BUSTIMER) { 871 panic("EISA bus timeout, likely hardware failure."); 872 } else if(eisa_port & ENMI_IOSTATUS) { 873 panic("EISA I/O port status error."); 874 } else { 875 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 876 return(0); 877 } 878} 879 880/* 881 * Caught a stray interrupt, notify 882 */ 883static void 884isa_strayintr(d) 885 int d; 886{ 887 888 /* DON'T BOTHER FOR NOW! */ 889 /* for some reason, we get bursts of intr #7, even if not enabled! */ 890 /* 891 * Well the reason you got bursts of intr #7 is because someone 892 * raised an interrupt line and dropped it before the 8259 could 893 * prioritize it. This is documented in the intel data book. This 894 * means you have BAD hardware! I have changed this so that only 895 * the first 5 get logged, then it quits logging them, and puts 896 * out a special message. rgrimes 3/25/1993 897 */ 898 /* 899 * XXX TODO print a different message for #7 if it is for a 900 * glitch. Glitches can be distinguished from real #7's by 901 * testing that the in-service bit is _not_ set. The test 902 * must be done before sending an EOI so it can't be done if 903 * we are using AUTO_EOI_1. 904 */ 905 if (intrcnt[NR_DEVICES + d] <= 5) 906 log(LOG_ERR, "stray irq %d\n", d); 907 if (intrcnt[NR_DEVICES + d] == 5) 908 log(LOG_CRIT, 909 "too many stray irq %d's; not logging any more\n", d); 910} 911 912/* 913 * Find the highest priority enabled display device. Since we can't 914 * distinguish display devices from ttys, depend on display devices 915 * being before serial ttys in the table. 916 */ 917struct isa_device * 918find_display() 919{ 920 struct isa_device *dvp; 921 922 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 923 if (dvp->id_enabled) 924 return (dvp); 925 return (NULL); 926} 927 928/* 929 * find an ISA device in a given isa_devtab_* table, given 930 * the table to search, the expected id_driver entry, and the unit number. 931 * 932 * this function is defined in isa_device.h, and this location is debatable; 933 * i put it there because it's useless w/o, and directly operates on 934 * the other stuff in that file. 935 * 936 */ 937 938struct isa_device *find_isadev(table, driverp, unit) 939 struct isa_device *table; 940 struct isa_driver *driverp; 941 int unit; 942{ 943 if (driverp == NULL) /* sanity check */ 944 return NULL; 945 946 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 947 if (table->id_driver == 0) 948 return NULL; 949 950 table++; 951 } 952 953 return table; 954} 955 956/* 957 * Return nonzero if a (masked) irq is pending for a given device. 958 */ 959int 960isa_irq_pending(dvp) 961 struct isa_device *dvp; 962{ 963 unsigned id_irq; 964 965 id_irq = dvp->id_irq; 966 if (id_irq & 0xff) 967 return (inb(IO_ICU1) & id_irq); 968 return (inb(IO_ICU2) & (id_irq >> 8)); 969} 970 971int 972update_intr_masks(void) 973{ 974 int intr, n=0; 975 u_int mask,*maskptr; 976 for (intr=0; intr < ICU_LEN; intr ++) { 977 if (intr==2) continue; 978 maskptr = intr_mptr[intr]; 979 if (!maskptr) continue; 980 mask = *maskptr; 981 if (mask != intr_mask[intr]) { 982#if 0 983 printf ("intr_mask[%2d] old=%08x new=%08x ptr=%p.\n", 984 intr, intr_mask[intr], mask, maskptr); 985#endif 986 intr_mask[intr]=mask; 987 n++; 988 } 989 990 } 991 return (n); 992} 993 994int 995register_intr(intr, device_id, flags, handler, maskptr, unit) 996 int intr; 997 int device_id; 998 u_int flags; 999 inthand2_t *handler; 1000 u_int *maskptr; 1001 int unit; 1002{ 1003 char *cp; 1004 u_long ef; 1005 int id; 1006 u_int mask = (maskptr ? *maskptr : 0); 1007 1008 if ((u_int)intr >= ICU_LEN || intr == 2 1009 || (u_int)device_id >= NR_DEVICES) 1010 return (EINVAL); 1011 if (intr_handler[intr] != isa_strayintr) 1012 return (EBUSY); 1013 ef = read_eflags(); 1014 disable_intr(); 1015 intr_countp[intr] = &intrcnt[device_id]; 1016 intr_handler[intr] = handler; 1017 intr_mptr[intr] = maskptr; 1018 intr_mask[intr] = mask | (1 << intr); 1019 intr_unit[intr] = unit; 1020 setidt(ICU_OFFSET + intr, 1021 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 1022 SDT_SYS386IGT, SEL_KPL); 1023 write_eflags(ef); 1024 for (cp = intrnames, id = 0; id <= device_id; id++) 1025 while (*cp++ != '\0') 1026 ; 1027 if (cp > eintrnames) 1028 return (0); 1029 if (intr < 10) { 1030 cp[-3] = intr + '0'; 1031 cp[-2] = ' '; 1032 } else { 1033 cp[-3] = '1'; 1034 cp[-2] = intr - 10 + '0'; 1035 } 1036 return (0); 1037} 1038 1039static void 1040register_imask(dvp, mask) 1041 struct isa_device *dvp; 1042 u_int mask; 1043{ 1044 if (dvp->id_alive && dvp->id_irq) { 1045 int intr; 1046 1047 intr = ffs(dvp->id_irq) - 1; 1048 intr_mask[intr] = mask | (1 <<intr); 1049 } 1050 (void) update_intr_masks(); 1051} 1052 1053int 1054unregister_intr(intr, handler) 1055 int intr; 1056 inthand2_t *handler; 1057{ 1058 u_long ef; 1059 1060 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 1061 return (EINVAL); 1062 ef = read_eflags(); 1063 disable_intr(); 1064 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 1065 intr_handler[intr] = isa_strayintr; 1066 intr_mptr[intr] = NULL; 1067 intr_mask[intr] = HWI_MASK | SWI_MASK; 1068 intr_unit[intr] = intr; 1069 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); 1070 write_eflags(ef); 1071 return (0); 1072} 1073