isa.c revision 6710
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 1.38 1995/02/25 18:29:10 phk 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]; 108int intr_unit[ICU_LEN]; 109 110struct kern_devconf kdc_isa0 = { 111 0, 0, 0, /* filled in by dev_attach */ 112 "isa", 0, { MDDT_BUS, 0 }, 113 0, 0, 0, BUS_EXTERNALLEN, 114 0, /* no parent yet; parent should be CPU */ 115 0, /* no parentdata */ 116 DC_BUSY, /* busses are always busy */ 117 "ISA or EISA bus" 118}; 119 120static inthand_t *fastintr[ICU_LEN] = { 121 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 122 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 123 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 124 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 125 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 126 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 127 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 128 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 129}; 130 131static inthand_t *slowintr[ICU_LEN] = { 132 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 133 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 134 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 135 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 136}; 137 138static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 139static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 140 int item, char const *whatnot, char const *reason, 141 char const *format)); 142static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 143 u_int checkbits)); 144static int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits)); 145static inthand2_t isa_strayintr; 146static void register_imask __P((struct isa_device *dvp, u_int mask)); 147 148/* 149 * print a conflict message 150 */ 151static void 152conflict(dvp, tmpdvp, item, whatnot, reason, format) 153 struct isa_device *dvp; 154 struct isa_device *tmpdvp; 155 int item; 156 char const *whatnot; 157 char const *reason; 158 char const *format; 159{ 160 printf("%s%d not %sed due to %s conflict with %s%d at ", 161 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 162 tmpdvp->id_driver->name, tmpdvp->id_unit); 163 printf(format, item); 164 printf("\n"); 165} 166 167/* 168 * Check to see if things are alread in use, like IRQ's, I/O addresses 169 * and Memory addresses. 170 */ 171static int 172haveseen(dvp, tmpdvp, checkbits) 173 struct isa_device *dvp; 174 struct isa_device *tmpdvp; 175 u_int checkbits; 176{ 177 /* 178 * Only check against devices that have already been found 179 */ 180 if (tmpdvp->id_alive) { 181 char const *whatnot; 182 183 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 184 /* 185 * Check for I/O address conflict. We can only check the 186 * starting address of the device against the range of the 187 * device that has already been probed since we do not 188 * know how many I/O addresses this device uses. 189 */ 190 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 191 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 192 (dvp->id_iobase <= 193 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 194 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 195 "I/O address", "0x%x"); 196 return 1; 197 } 198 } 199 /* 200 * Check for Memory address conflict. We can check for 201 * range overlap, but it will not catch all cases since the 202 * driver may adjust the msize paramater during probe, for 203 * now we just check that the starting address does not 204 * fall within any allocated region. 205 * XXX could add a second check after the probe for overlap, 206 * since at that time we would know the full range. 207 * XXX KERNBASE is a hack, we should have vaddr in the table! 208 */ 209 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 210 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 211 (KERNBASE + dvp->id_maddr <= 212 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 213 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 214 whatnot, "maddr", "0x%x"); 215 return 1; 216 } 217 } 218 /* 219 * Check for IRQ conflicts. 220 */ 221 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 222 if (tmpdvp->id_irq == dvp->id_irq) { 223 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 224 whatnot, "irq", "%d"); 225 return 1; 226 } 227 } 228 /* 229 * Check for DRQ conflicts. 230 */ 231 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 232 if (tmpdvp->id_drq == dvp->id_drq) { 233 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 234 "drq", "%d"); 235 return 1; 236 } 237 } 238 } 239 return 0; 240} 241 242/* 243 * Search through all the isa_devtab_* tables looking for anything that 244 * conflicts with the current device. 245 */ 246static int 247haveseen_isadev(dvp, checkbits) 248 struct isa_device *dvp; 249 u_int checkbits; 250{ 251 struct isa_device *tmpdvp; 252 int status = 0; 253 254 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 255 status |= haveseen(dvp, tmpdvp, checkbits); 256 if (status) 257 return status; 258 } 259 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 260 status |= haveseen(dvp, tmpdvp, checkbits); 261 if (status) 262 return status; 263 } 264 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 265 status |= haveseen(dvp, tmpdvp, checkbits); 266 if (status) 267 return status; 268 } 269 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 270 status |= haveseen(dvp, tmpdvp, checkbits); 271 if (status) 272 return status; 273 } 274 return(status); 275} 276 277/* 278 * Configure all ISA devices 279 */ 280void 281isa_configure() { 282 struct isa_device *dvp; 283 284 dev_attach(&kdc_isa0); 285 286 splhigh(); 287 enable_intr(); 288 INTREN(IRQ_SLAVE); 289 printf("Probing for devices on the ISA bus:\n"); 290 /* First probe all the sensitive probes */ 291 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 292 if (dvp->id_driver->sensitive_hw) 293 config_isadev(dvp, &tty_imask); 294 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 295 if (dvp->id_driver->sensitive_hw) 296 config_isadev(dvp, &bio_imask); 297 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 298 if (dvp->id_driver->sensitive_hw) 299 config_isadev(dvp, &net_imask); 300 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 301 if (dvp->id_driver->sensitive_hw) 302 config_isadev(dvp, (u_int *)NULL); 303 304 /* Then all the bad ones */ 305 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 306 if (!dvp->id_driver->sensitive_hw) 307 config_isadev(dvp, &tty_imask); 308 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 309 if (!dvp->id_driver->sensitive_hw) 310 config_isadev(dvp, &bio_imask); 311 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 312 if (!dvp->id_driver->sensitive_hw) 313 config_isadev(dvp, &net_imask); 314 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 315 if (!dvp->id_driver->sensitive_hw) 316 config_isadev(dvp, (u_int *)NULL); 317 318 bio_imask |= SWI_CLOCK_MASK; 319 net_imask |= SWI_NET_MASK; 320 tty_imask |= SWI_TTY_MASK; 321 322/* 323 * XXX we should really add the tty device to net_imask when the line is 324 * switched to SLIPDISC, and then remove it when it is switched away from 325 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 326 * of them is running slip. 327 * 328 * XXX actually, blocking all ttys during a splimp doesn't matter so much 329 * with sio because the serial interrupt layer doesn't use tty_imask. Only 330 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 331 * during spltty. 332 */ 333#include "sl.h" 334#include "ppp.h" 335 336#if (NSL > 0) || (NPPP > 0) 337 net_imask |= tty_imask; 338 tty_imask = net_imask; 339#endif 340 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 341#ifdef DIAGNOSTIC 342 printf("bio_imask %x tty_imask %x net_imask %x\n", 343 bio_imask, tty_imask, net_imask); 344#endif 345 /* 346 * Finish initializing intr_mask[]. Note that the partly 347 * constructed masks aren't actually used since we're at splhigh. 348 * For fully dynamic initialization, register_intr() and 349 * unregister_intr() will have to adjust the masks for _all_ 350 * interrupts and for tty_imask, etc. 351 */ 352 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 353 register_imask(dvp, tty_imask); 354 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 355 register_imask(dvp, bio_imask); 356 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 357 register_imask(dvp, net_imask); 358 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 359 register_imask(dvp, SWI_CLOCK_MASK); 360 spl0(); 361} 362 363/* 364 * Configure an ISA device. 365 */ 366 367 368static void config_isadev_c(); 369 370static void 371config_isadev(isdp, mp) 372 struct isa_device *isdp; 373 u_int *mp; 374{ 375 config_isadev_c(isdp, mp, 0); 376} 377 378void 379reconfig_isadev(isdp, mp) 380 struct isa_device *isdp; 381 u_int *mp; 382{ 383 config_isadev_c(isdp, mp, 1); 384} 385 386static void 387config_isadev_c(isdp, mp, reconfig) 388 struct isa_device *isdp; 389 u_int *mp; 390 int reconfig; 391{ 392 u_int checkbits; 393 int id_alive; 394 int last_alive; 395 struct isa_driver *dp = isdp->id_driver; 396 397 checkbits = 0; 398#ifndef ALLOW_CONFLICT_DRQ 399 checkbits |= CC_DRQ; 400#endif 401#ifndef ALLOW_CONFLICT_IOADDR 402 checkbits |= CC_IOADDR; 403#endif 404#ifndef ALLOW_CONFLICT_MEMADDR 405 checkbits |= CC_MEMADDR; 406#endif 407 if (!isdp->id_enabled) { 408 printf("%s%d: disabled, not probed.\n", 409 dp->name, isdp->id_unit); 410 return; 411 } 412 if (!reconfig && haveseen_isadev(isdp, checkbits)) 413 return; 414 if (!reconfig && isdp->id_maddr) { 415 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 416 isdp->id_maddr += atdevbase; 417 } 418 if (reconfig) { 419 last_alive = isdp->id_alive; 420 isdp->id_reconfig = 1; 421 } 422 else { 423 last_alive = 0; 424 isdp->id_reconfig = 0; 425 } 426 id_alive = (*dp->probe)(isdp); 427 if (id_alive) { 428 /* 429 * Only print the I/O address range if id_alive != -1 430 * Right now this is a temporary fix just for the new 431 * NPX code so that if it finds a 486 that can use trap 432 * 16 it will not report I/O addresses. 433 * Rod Grimes 04/26/94 434 */ 435 if (!isdp->id_reconfig) { 436 printf("%s%d", dp->name, isdp->id_unit); 437 if (id_alive != -1) { 438 printf(" at 0x%x", isdp->id_iobase); 439 if ((isdp->id_iobase + id_alive - 1) != 440 isdp->id_iobase) { 441 printf("-0x%x", 442 isdp->id_iobase + id_alive - 1); 443 } 444 } 445 if (isdp->id_irq) 446 printf(" irq %d", ffs(isdp->id_irq) - 1); 447 if (isdp->id_drq != -1) 448 printf(" drq %d", isdp->id_drq); 449 if (isdp->id_maddr) 450 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 451 if (isdp->id_msize) 452 printf(" msize %d", isdp->id_msize); 453 if (isdp->id_flags) 454 printf(" flags 0x%x", isdp->id_flags); 455 if (isdp->id_iobase) { 456 if (!(isdp->id_iobase & 0xf300)) { 457 printf(" on motherboard\n"); 458 } else if (isdp->id_iobase >= 0x1000 && 459 !(isdp->id_iobase & 0x300)) { 460 printf (" on eisa slot %d\n", 461 isdp->id_iobase >> 12); 462 } else { 463 printf (" on isa\n"); 464 } 465 } 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 958register_intr(intr, device_id, flags, handler, maskptr, unit) 959 int intr; 960 int device_id; 961 u_int flags; 962 inthand2_t *handler; 963 u_int *maskptr; 964 int unit; 965{ 966 char *cp; 967 u_long ef; 968 int id; 969 u_int mask = (maskptr ? *maskptr : 0); 970 971 if ((u_int)intr >= ICU_LEN || intr == 2 972 || (u_int)device_id >= NR_DEVICES) 973 return (EINVAL); 974 if (intr_handler[intr] != isa_strayintr) 975 return (EBUSY); 976 ef = read_eflags(); 977 disable_intr(); 978 intr_countp[intr] = &intrcnt[device_id]; 979 intr_handler[intr] = handler; 980 intr_mask[intr] = mask | (1 << intr); 981 intr_unit[intr] = unit; 982 setidt(ICU_OFFSET + intr, 983 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 984 SDT_SYS386IGT, SEL_KPL); 985 write_eflags(ef); 986 for (cp = intrnames, id = 0; id <= device_id; id++) 987 while (*cp++ != '\0') 988 ; 989 if (cp > eintrnames) 990 return (0); 991 if (intr < 10) { 992 cp[-3] = intr + '0'; 993 cp[-2] = ' '; 994 } else { 995 cp[-3] = '1'; 996 cp[-2] = intr - 10 + '0'; 997 } 998 return (0); 999} 1000 1001static void 1002register_imask(dvp, mask) 1003 struct isa_device *dvp; 1004 u_int mask; 1005{ 1006 if (dvp->id_alive && dvp->id_irq) { 1007 int intr; 1008 1009 intr = ffs(dvp->id_irq) - 1; 1010 intr_mask[intr] = mask | (1 <<intr); 1011 } 1012} 1013 1014int 1015unregister_intr(intr, handler) 1016 int intr; 1017 inthand2_t *handler; 1018{ 1019 u_long ef; 1020 1021 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 1022 return (EINVAL); 1023 ef = read_eflags(); 1024 disable_intr(); 1025 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 1026 intr_handler[intr] = isa_strayintr; 1027 intr_mask[intr] = HWI_MASK | SWI_MASK; 1028 intr_unit[intr] = intr; 1029 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); 1030 write_eflags(ef); 1031 return (0); 1032} 1033