isa.c revision 7780
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 1.44 1995/04/06 13:55:56 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 111extern struct kern_devconf kdc_cpu0; 112 113struct kern_devconf kdc_isa0 = { 114 0, 0, 0, /* filled in by dev_attach */ 115 "isa", 0, { MDDT_BUS, 0 }, 116 0, 0, 0, BUS_EXTERNALLEN, 117 &kdc_cpu0, /* parent is the CPU */ 118 0, /* no parentdata */ 119 DC_BUSY, /* busses are always busy */ 120 "ISA or EISA bus", 121 DC_CLS_BUS /* class */ 122}; 123 124static inthand_t *fastintr[ICU_LEN] = { 125 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 126 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 127 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 128 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 129 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 130 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 131 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 132 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 133}; 134 135static inthand_t *slowintr[ICU_LEN] = { 136 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 137 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 138 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 139 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 140}; 141 142static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 143static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 144 int reconfig)); 145static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 146 int item, char const *whatnot, char const *reason, 147 char const *format)); 148static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 149 u_int checkbits)); 150static int haveseen_isadev __P((struct isa_device *dvp, u_int checkbits)); 151static inthand2_t isa_strayintr; 152static void register_imask __P((struct isa_device *dvp, u_int mask)); 153 154/* 155 * print a conflict message 156 */ 157static void 158conflict(dvp, tmpdvp, item, whatnot, reason, format) 159 struct isa_device *dvp; 160 struct isa_device *tmpdvp; 161 int item; 162 char const *whatnot; 163 char const *reason; 164 char const *format; 165{ 166 printf("%s%d not %sed due to %s conflict with %s%d at ", 167 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 168 tmpdvp->id_driver->name, tmpdvp->id_unit); 169 printf(format, item); 170 printf("\n"); 171} 172 173/* 174 * Check to see if things are alread in use, like IRQ's, I/O addresses 175 * and Memory addresses. 176 */ 177static int 178haveseen(dvp, tmpdvp, checkbits) 179 struct isa_device *dvp; 180 struct isa_device *tmpdvp; 181 u_int checkbits; 182{ 183 /* 184 * Only check against devices that have already been found 185 */ 186 if (tmpdvp->id_alive) { 187 char const *whatnot; 188 189 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 190 /* 191 * Check for I/O address conflict. We can only check the 192 * starting address of the device against the range of the 193 * device that has already been probed since we do not 194 * know how many I/O addresses this device uses. 195 */ 196 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 197 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 198 (dvp->id_iobase <= 199 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 200 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 201 "I/O address", "0x%x"); 202 return 1; 203 } 204 } 205 /* 206 * Check for Memory address conflict. We can check for 207 * range overlap, but it will not catch all cases since the 208 * driver may adjust the msize paramater during probe, for 209 * now we just check that the starting address does not 210 * fall within any allocated region. 211 * XXX could add a second check after the probe for overlap, 212 * since at that time we would know the full range. 213 * XXX KERNBASE is a hack, we should have vaddr in the table! 214 */ 215 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 216 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 217 (KERNBASE + dvp->id_maddr <= 218 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 219 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 220 whatnot, "maddr", "0x%x"); 221 return 1; 222 } 223 } 224 /* 225 * Check for IRQ conflicts. 226 */ 227 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 228 if (tmpdvp->id_irq == dvp->id_irq) { 229 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 230 whatnot, "irq", "%d"); 231 return 1; 232 } 233 } 234 /* 235 * Check for DRQ conflicts. 236 */ 237 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 238 if (tmpdvp->id_drq == dvp->id_drq) { 239 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 240 "drq", "%d"); 241 return 1; 242 } 243 } 244 } 245 return 0; 246} 247 248/* 249 * Search through all the isa_devtab_* tables looking for anything that 250 * conflicts with the current device. 251 */ 252static int 253haveseen_isadev(dvp, checkbits) 254 struct isa_device *dvp; 255 u_int checkbits; 256{ 257 struct isa_device *tmpdvp; 258 int status = 0; 259 260 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 261 status |= haveseen(dvp, tmpdvp, checkbits); 262 if (status) 263 return status; 264 } 265 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 266 status |= haveseen(dvp, tmpdvp, checkbits); 267 if (status) 268 return status; 269 } 270 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 271 status |= haveseen(dvp, tmpdvp, checkbits); 272 if (status) 273 return status; 274 } 275 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 276 status |= haveseen(dvp, tmpdvp, checkbits); 277 if (status) 278 return status; 279 } 280 return(status); 281} 282 283/* 284 * Configure all ISA devices 285 */ 286void 287isa_configure() { 288 struct isa_device *dvp; 289 290 dev_attach(&kdc_isa0); 291 292 splhigh(); 293 enable_intr(); 294 INTREN(IRQ_SLAVE); 295 printf("Probing for devices on the ISA bus:\n"); 296 /* First probe all the sensitive probes */ 297 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 298 if (dvp->id_driver->sensitive_hw) 299 config_isadev(dvp, &tty_imask); 300 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 301 if (dvp->id_driver->sensitive_hw) 302 config_isadev(dvp, &bio_imask); 303 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 304 if (dvp->id_driver->sensitive_hw) 305 config_isadev(dvp, &net_imask); 306 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 307 if (dvp->id_driver->sensitive_hw) 308 config_isadev(dvp, (u_int *)NULL); 309 310 /* Then all the bad ones */ 311 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 312 if (!dvp->id_driver->sensitive_hw) 313 config_isadev(dvp, &tty_imask); 314 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 315 if (!dvp->id_driver->sensitive_hw) 316 config_isadev(dvp, &bio_imask); 317 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 318 if (!dvp->id_driver->sensitive_hw) 319 config_isadev(dvp, &net_imask); 320 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 321 if (!dvp->id_driver->sensitive_hw) 322 config_isadev(dvp, (u_int *)NULL); 323 324 bio_imask |= SWI_CLOCK_MASK; 325 net_imask |= SWI_NET_MASK; 326 tty_imask |= SWI_TTY_MASK; 327 328/* 329 * XXX we should really add the tty device to net_imask when the line is 330 * switched to SLIPDISC, and then remove it when it is switched away from 331 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 332 * of them is running slip. 333 * 334 * XXX actually, blocking all ttys during a splimp doesn't matter so much 335 * with sio because the serial interrupt layer doesn't use tty_imask. Only 336 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 337 * during spltty. 338 */ 339#include "sl.h" 340#include "ppp.h" 341 342#if (NSL > 0) || (NPPP > 0) 343 net_imask |= tty_imask; 344 tty_imask = net_imask; 345#endif 346 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 347#ifdef DIAGNOSTIC 348 printf("bio_imask %x tty_imask %x net_imask %x\n", 349 bio_imask, tty_imask, net_imask); 350#endif 351 /* 352 * Finish initializing intr_mask[]. Note that the partly 353 * constructed masks aren't actually used since we're at splhigh. 354 * For fully dynamic initialization, register_intr() and 355 * unregister_intr() will have to adjust the masks for _all_ 356 * interrupts and for tty_imask, etc. 357 */ 358 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 359 register_imask(dvp, tty_imask); 360 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 361 register_imask(dvp, bio_imask); 362 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 363 register_imask(dvp, net_imask); 364 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 365 register_imask(dvp, SWI_CLOCK_MASK); 366 spl0(); 367} 368 369/* 370 * Configure an ISA device. 371 */ 372 373 374static void 375config_isadev(isdp, mp) 376 struct isa_device *isdp; 377 u_int *mp; 378{ 379 config_isadev_c(isdp, mp, 0); 380} 381 382void 383reconfig_isadev(isdp, mp) 384 struct isa_device *isdp; 385 u_int *mp; 386{ 387 config_isadev_c(isdp, mp, 1); 388} 389 390static void 391config_isadev_c(isdp, mp, reconfig) 392 struct isa_device *isdp; 393 u_int *mp; 394 int reconfig; 395{ 396 u_int checkbits; 397 int id_alive; 398 int last_alive; 399 struct isa_driver *dp = isdp->id_driver; 400 401 checkbits = 0; 402#ifndef ALLOW_CONFLICT_DRQ 403 checkbits |= CC_DRQ; 404#endif 405#ifndef ALLOW_CONFLICT_IOADDR 406 checkbits |= CC_IOADDR; 407#endif 408#ifndef ALLOW_CONFLICT_MEMADDR 409 checkbits |= CC_MEMADDR; 410#endif 411 if (!isdp->id_enabled) { 412 printf("%s%d: disabled, not probed.\n", 413 dp->name, isdp->id_unit); 414 return; 415 } 416 if (!reconfig && haveseen_isadev(isdp, checkbits)) 417 return; 418 if (!reconfig && isdp->id_maddr) { 419 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 420 isdp->id_maddr += atdevbase; 421 } 422 if (reconfig) { 423 last_alive = isdp->id_alive; 424 isdp->id_reconfig = 1; 425 } 426 else { 427 last_alive = 0; 428 isdp->id_reconfig = 0; 429 } 430 id_alive = (*dp->probe)(isdp); 431 if (id_alive) { 432 /* 433 * Only print the I/O address range if id_alive != -1 434 * Right now this is a temporary fix just for the new 435 * NPX code so that if it finds a 486 that can use trap 436 * 16 it will not report I/O addresses. 437 * Rod Grimes 04/26/94 438 */ 439 if (!isdp->id_reconfig) { 440 printf("%s%d", dp->name, isdp->id_unit); 441 if (id_alive != -1) { 442 printf(" at 0x%x", isdp->id_iobase); 443 if ((isdp->id_iobase + id_alive - 1) != 444 isdp->id_iobase) { 445 printf("-0x%x", 446 isdp->id_iobase + id_alive - 1); 447 } 448 } 449 if (isdp->id_irq) 450 printf(" irq %d", ffs(isdp->id_irq) - 1); 451 if (isdp->id_drq != -1) 452 printf(" drq %d", isdp->id_drq); 453 if (isdp->id_maddr) 454 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 455 if (isdp->id_msize) 456 printf(" msize %d", isdp->id_msize); 457 if (isdp->id_flags) 458 printf(" flags 0x%x", isdp->id_flags); 459 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 460 printf(" on motherboard"); 461 } else if (isdp->id_iobase >= 0x1000 && 462 !(isdp->id_iobase & 0x300)) { 463 printf (" on eisa slot %d", 464 isdp->id_iobase >> 12); 465 } else { 466 printf (" on isa"); 467 } 468 printf("\n"); 469 /* 470 * Check for conflicts again. The driver may have 471 * changed *dvp. We should weaken the early check 472 * since the driver may have been able to change 473 * *dvp to avoid conflicts if given a chance. We 474 * already skip the early check for IRQs and force 475 * a check for IRQs in the next group of checks. 476 */ 477#ifndef ALLOW_CONFLICT_IRQ 478 checkbits |= CC_IRQ; 479#endif 480 if (haveseen_isadev(isdp, checkbits)) 481 return; 482 isdp->id_alive = id_alive; 483 } 484 (*dp->attach)(isdp); 485 if (isdp->id_irq) { 486 if (mp) 487 INTRMASK(*mp, isdp->id_irq); 488 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 489 isdp->id_ri_flags, isdp->id_intr, 490 mp, isdp->id_unit); 491 INTREN(isdp->id_irq); 492 } 493 } else { 494 if (isdp->id_reconfig) { 495 (*dp->attach)(isdp); /* reconfiguration attach */ 496 } 497 if (!last_alive) { 498 if (!isdp->id_reconfig) { 499 printf("%s%d not found", dp->name, isdp->id_unit); 500 if (isdp->id_iobase) { 501 printf(" at 0x%x", isdp->id_iobase); 502 } 503 printf("\n"); 504 } 505 } 506 else { 507 /* This code has not been tested.... */ 508 if (isdp->id_irq) { 509 INTRDIS(isdp->id_irq); 510 unregister_intr(ffs(isdp->id_irq) - 1, 511 isdp->id_intr); 512 if (mp) 513 INTRUNMASK(*mp, isdp->id_irq); 514 } 515 } 516 } 517} 518 519/* 520 * Provide ISA-specific device information to user programs using the 521 * hw.devconf interface. 522 */ 523int 524isa_externalize(struct isa_device *id, void *userp, size_t *maxlen) 525{ 526 if(*maxlen < sizeof *id) { 527 return ENOMEM; 528 } 529 530 *maxlen -= sizeof *id; 531 return copyout(id, userp, sizeof *id); 532} 533 534/* 535 * Do the same thing for EISA information. EISA information is currently 536 * the same as ISA information plus a slot number, but could be extended in 537 * the future. 538 */ 539int 540eisa_externalize(struct isa_device *id, int slot, void *userp, size_t *maxlen) 541{ 542 int rv; 543 544 if(*maxlen < (sizeof *id) + (sizeof slot)) { 545 return ENOMEM; 546 } 547 *maxlen -= (sizeof *id) + (sizeof slot); 548 549 rv = copyout(id, userp, sizeof *id); 550 if(rv) return rv; 551 552 return copyout(&slot, (char *)userp + sizeof *id, sizeof slot); 553} 554 555/* 556 * This is used to forcibly reconfigure an ISA device. It currently just 557 * returns an error 'cos you can't do that yet. It is here to demonstrate 558 * what the `internalize' routine is supposed to do. 559 */ 560int 561isa_internalize(struct isa_device *id, void **userpp, size_t *len) 562{ 563 struct isa_device myid; 564 char *userp = *userpp; 565 int rv; 566 567 if(*len < sizeof *id) { 568 return EINVAL; 569 } 570 571 rv = copyin(userp, &myid, sizeof myid); 572 if(rv) return rv; 573 *userpp = userp + sizeof myid; 574 *len -= sizeof myid; 575 576 rv = EOPNOTSUPP; 577 /* code would go here to validate the configuration request */ 578 /* code would go here to actually perform the reconfiguration */ 579 return rv; 580} 581 582int 583isa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 584 void *userp, size_t l) 585{ 586 return isa_externalize(kdc->kdc_isa, userp, &l); 587} 588 589int 590eisa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 591 void *userp, size_t l) 592{ 593 return eisa_externalize(kdc->kdc_isa, -1, userp, &l); 594} 595 596/* 597 * Fill in default interrupt table (in case of spuruious interrupt 598 * during configuration of kernel, setup interrupt control unit 599 */ 600void 601isa_defaultirq() 602{ 603 int i; 604 605 /* icu vectors */ 606 for (i = 0; i < ICU_LEN; i++) 607 unregister_intr(i, (inthand2_t *)NULL); 608 609 /* initialize 8259's */ 610 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 611 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 612 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 613#ifdef AUTO_EOI_1 614 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 615#else 616 outb(IO_ICU1+1, 1); /* 8086 mode */ 617#endif 618 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 619 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 620 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 621 622 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 623 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 624 outb(IO_ICU2+1,2); /* my slave id is 2 */ 625#ifdef AUTO_EOI_2 626 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 627#else 628 outb(IO_ICU2+1,1); /* 8086 mode */ 629#endif 630 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 631 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 632} 633 634/* region of physical memory known to be contiguous */ 635vm_offset_t isaphysmem; 636static caddr_t dma_bounce[8]; /* XXX */ 637static char bounced[8]; /* XXX */ 638#define MAXDMASZ 512 /* XXX */ 639 640/* high byte of address is stored in this port for i-th dma channel */ 641static short dmapageport[8] = 642 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 643 644/* 645 * isa_dmacascade(): program 8237 DMA controller channel to accept 646 * external dma control by a board. 647 */ 648void isa_dmacascade(unsigned chan) 649{ 650 if (chan > 7) 651 panic("isa_dmacascade: impossible request"); 652 653 /* set dma channel mode, and set dma channel mode */ 654 if ((chan & 4) == 0) { 655 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 656 outb(DMA1_SMSK, chan); 657 } else { 658 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 659 outb(DMA2_SMSK, chan & 3); 660 } 661} 662 663static int 664isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); 665 666/* 667 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 668 * problems by using a bounce buffer. 669 */ 670void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 671{ vm_offset_t phys; 672 int waport; 673 caddr_t newaddr; 674 675 if ( chan > 7 676 || (chan < 4 && nbytes > (1<<16)) 677 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 678 panic("isa_dmastart: impossible request"); 679 680 if (isa_dmarangecheck(addr, nbytes, chan)) { 681 if (dma_bounce[chan] == 0) 682 dma_bounce[chan] = 683 /*(caddr_t)malloc(MAXDMASZ, M_TEMP, M_WAITOK);*/ 684 (caddr_t) isaphysmem + NBPG*chan; 685 bounced[chan] = 1; 686 newaddr = dma_bounce[chan]; 687 *(int *) newaddr = 0; /* XXX */ 688 689 /* copy bounce buffer on write */ 690 if (!(flags & B_READ)) 691 bcopy(addr, newaddr, nbytes); 692 addr = newaddr; 693 } 694 695 /* translate to physical */ 696 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 697 698 if ((chan & 4) == 0) { 699 /* 700 * Program one of DMA channels 0..3. These are 701 * byte mode channels. 702 */ 703 /* set dma channel mode, and reset address ff */ 704 705 /* If B_RAW flag is set, then use autoinitialise mode */ 706 if (flags & B_RAW) { 707 if (flags & B_READ) 708 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 709 else 710 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 711 } 712 else 713 if (flags & B_READ) 714 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 715 else 716 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 717 outb(DMA1_FFC, 0); 718 719 /* send start address */ 720 waport = DMA1_CHN(chan); 721 outb(waport, phys); 722 outb(waport, phys>>8); 723 outb(dmapageport[chan], phys>>16); 724 725 /* send count */ 726 outb(waport + 1, --nbytes); 727 outb(waport + 1, nbytes>>8); 728 729 /* unmask channel */ 730 outb(DMA1_SMSK, chan); 731 } else { 732 /* 733 * Program one of DMA channels 4..7. These are 734 * word mode channels. 735 */ 736 /* set dma channel mode, and reset address ff */ 737 738 /* If B_RAW flag is set, then use autoinitialise mode */ 739 if (flags & B_RAW) { 740 if (flags & B_READ) 741 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 742 else 743 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 744 } 745 else 746 if (flags & B_READ) 747 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 748 else 749 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 750 outb(DMA2_FFC, 0); 751 752 /* send start address */ 753 waport = DMA2_CHN(chan - 4); 754 outb(waport, phys>>1); 755 outb(waport, phys>>9); 756 outb(dmapageport[chan], phys>>16); 757 758 /* send count */ 759 nbytes >>= 1; 760 outb(waport + 2, --nbytes); 761 outb(waport + 2, nbytes>>8); 762 763 /* unmask channel */ 764 outb(DMA2_SMSK, chan & 3); 765 } 766} 767 768void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 769{ 770 771 /* copy bounce buffer on read */ 772 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 773 if (bounced[chan]) { 774 bcopy(dma_bounce[chan], addr, nbytes); 775 bounced[chan] = 0; 776 } 777} 778 779/* 780 * Check for problems with the address range of a DMA transfer 781 * (non-contiguous physical pages, outside of bus address space, 782 * crossing DMA page boundaries). 783 * Return true if special handling needed. 784 */ 785 786static int 787isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 788 vm_offset_t phys, priorpage = 0, endva; 789 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 790 791 endva = (vm_offset_t)round_page(va + length); 792 for (; va < (caddr_t) endva ; va += NBPG) { 793 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 794#define ISARAM_END RAM_END 795 if (phys == 0) 796 panic("isa_dmacheck: no physical page present"); 797 if (phys >= ISARAM_END) 798 return (1); 799 if (priorpage) { 800 if (priorpage + NBPG != phys) 801 return (1); 802 /* check if crossing a DMA page boundary */ 803 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 804 return (1); 805 } 806 priorpage = phys; 807 } 808 return (0); 809} 810 811/* head of queue waiting for physmem to become available */ 812struct buf isa_physmemq; 813 814/* blocked waiting for resource to become free for exclusive use */ 815static isaphysmemflag; 816/* if waited for and call requested when free (B_CALL) */ 817static void (*isaphysmemunblock)(); /* needs to be a list */ 818 819/* 820 * Allocate contiguous physical memory for transfer, returning 821 * a *virtual* address to region. May block waiting for resource. 822 * (assumed to be called at splbio()) 823 */ 824caddr_t 825isa_allocphysmem(caddr_t va, unsigned length, void (*func)()) { 826 827 isaphysmemunblock = func; 828 while (isaphysmemflag & B_BUSY) { 829 isaphysmemflag |= B_WANTED; 830 tsleep((caddr_t)&isaphysmemflag, PRIBIO, "isaphys", 0); 831 } 832 isaphysmemflag |= B_BUSY; 833 834 return((caddr_t)isaphysmem); 835} 836 837/* 838 * Free contiguous physical memory used for transfer. 839 * (assumed to be called at splbio()) 840 */ 841void 842isa_freephysmem(caddr_t va, unsigned length) { 843 844 isaphysmemflag &= ~B_BUSY; 845 if (isaphysmemflag & B_WANTED) { 846 isaphysmemflag &= B_WANTED; 847 wakeup((caddr_t)&isaphysmemflag); 848 if (isaphysmemunblock) 849 (*isaphysmemunblock)(); 850 } 851} 852 853#define NMI_PARITY (1 << 7) 854#define NMI_IOCHAN (1 << 6) 855#define ENMI_WATCHDOG (1 << 7) 856#define ENMI_BUSTIMER (1 << 6) 857#define ENMI_IOSTATUS (1 << 5) 858 859/* 860 * Handle a NMI, possibly a machine check. 861 * return true to panic system, false to ignore. 862 */ 863int 864isa_nmi(cd) 865 int cd; 866{ 867 int isa_port = inb(0x61); 868 int eisa_port = inb(0x461); 869 if(isa_port & NMI_PARITY) { 870 panic("RAM parity error, likely hardware failure."); 871 } else if(isa_port & NMI_IOCHAN) { 872 panic("I/O channel check, likely hardware failure."); 873 } else if(eisa_port & ENMI_WATCHDOG) { 874 panic("EISA watchdog timer expired, likely hardware failure."); 875 } else if(eisa_port & ENMI_BUSTIMER) { 876 panic("EISA bus timeout, likely hardware failure."); 877 } else if(eisa_port & ENMI_IOSTATUS) { 878 panic("EISA I/O port status error."); 879 } else { 880 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 881 return(0); 882 } 883} 884 885/* 886 * Caught a stray interrupt, notify 887 */ 888static void 889isa_strayintr(d) 890 int d; 891{ 892 893 /* DON'T BOTHER FOR NOW! */ 894 /* for some reason, we get bursts of intr #7, even if not enabled! */ 895 /* 896 * Well the reason you got bursts of intr #7 is because someone 897 * raised an interrupt line and dropped it before the 8259 could 898 * prioritize it. This is documented in the intel data book. This 899 * means you have BAD hardware! I have changed this so that only 900 * the first 5 get logged, then it quits logging them, and puts 901 * out a special message. rgrimes 3/25/1993 902 */ 903 /* 904 * XXX TODO print a different message for #7 if it is for a 905 * glitch. Glitches can be distinguished from real #7's by 906 * testing that the in-service bit is _not_ set. The test 907 * must be done before sending an EOI so it can't be done if 908 * we are using AUTO_EOI_1. 909 */ 910 if (intrcnt[NR_DEVICES + d] <= 5) 911 log(LOG_ERR, "stray irq %d\n", d); 912 if (intrcnt[NR_DEVICES + d] == 5) 913 log(LOG_CRIT, 914 "too many stray irq %d's; not logging any more\n", d); 915} 916 917/* 918 * find an ISA device in a given isa_devtab_* table, given 919 * the table to search, the expected id_driver entry, and the unit number. 920 * 921 * this function is defined in isa_device.h, and this location is debatable; 922 * i put it there because it's useless w/o, and directly operates on 923 * the other stuff in that file. 924 * 925 */ 926 927struct isa_device *find_isadev(table, driverp, unit) 928 struct isa_device *table; 929 struct isa_driver *driverp; 930 int unit; 931{ 932 if (driverp == NULL) /* sanity check */ 933 return NULL; 934 935 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 936 if (table->id_driver == 0) 937 return NULL; 938 939 table++; 940 } 941 942 return table; 943} 944 945/* 946 * Return nonzero if a (masked) irq is pending for a given device. 947 */ 948int 949isa_irq_pending(dvp) 950 struct isa_device *dvp; 951{ 952 unsigned id_irq; 953 954 id_irq = dvp->id_irq; 955 if (id_irq & 0xff) 956 return (inb(IO_ICU1) & id_irq); 957 return (inb(IO_ICU2) & (id_irq >> 8)); 958} 959 960int 961update_intr_masks(void) 962{ 963 int intr, n=0; 964 u_int mask,*maskptr; 965 for (intr=0; intr < ICU_LEN; intr ++) { 966 if (intr==2) continue; 967 maskptr = intr_mptr[intr]; 968 if (!maskptr) continue; 969 mask = *maskptr; 970 if (mask != intr_mask[intr]) { 971#if 0 972 printf ("intr_mask[%2d] old=%08x new=%08x ptr=%p.\n", 973 intr, intr_mask[intr], mask, maskptr); 974#endif 975 intr_mask[intr]=mask; 976 n++; 977 } 978 979 } 980 return (n); 981} 982 983int 984register_intr(intr, device_id, flags, handler, maskptr, unit) 985 int intr; 986 int device_id; 987 u_int flags; 988 inthand2_t *handler; 989 u_int *maskptr; 990 int unit; 991{ 992 char *cp; 993 u_long ef; 994 int id; 995 u_int mask = (maskptr ? *maskptr : 0); 996 997 if ((u_int)intr >= ICU_LEN || intr == 2 998 || (u_int)device_id >= NR_DEVICES) 999 return (EINVAL); 1000 if (intr_handler[intr] != isa_strayintr) 1001 return (EBUSY); 1002 ef = read_eflags(); 1003 disable_intr(); 1004 intr_countp[intr] = &intrcnt[device_id]; 1005 intr_handler[intr] = handler; 1006 intr_mptr[intr] = maskptr; 1007 intr_mask[intr] = mask | (1 << intr); 1008 intr_unit[intr] = unit; 1009 setidt(ICU_OFFSET + intr, 1010 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 1011 SDT_SYS386IGT, SEL_KPL); 1012 write_eflags(ef); 1013 for (cp = intrnames, id = 0; id <= device_id; id++) 1014 while (*cp++ != '\0') 1015 ; 1016 if (cp > eintrnames) 1017 return (0); 1018 if (intr < 10) { 1019 cp[-3] = intr + '0'; 1020 cp[-2] = ' '; 1021 } else { 1022 cp[-3] = '1'; 1023 cp[-2] = intr - 10 + '0'; 1024 } 1025 return (0); 1026} 1027 1028static void 1029register_imask(dvp, mask) 1030 struct isa_device *dvp; 1031 u_int mask; 1032{ 1033 if (dvp->id_alive && dvp->id_irq) { 1034 int intr; 1035 1036 intr = ffs(dvp->id_irq) - 1; 1037 intr_mask[intr] = mask | (1 <<intr); 1038 } 1039 (void) update_intr_masks(); 1040} 1041 1042int 1043unregister_intr(intr, handler) 1044 int intr; 1045 inthand2_t *handler; 1046{ 1047 u_long ef; 1048 1049 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 1050 return (EINVAL); 1051 ef = read_eflags(); 1052 disable_intr(); 1053 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 1054 intr_handler[intr] = isa_strayintr; 1055 intr_mptr[intr] = NULL; 1056 intr_mask[intr] = HWI_MASK | SWI_MASK; 1057 intr_unit[intr] = intr; 1058 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); 1059 write_eflags(ef); 1060 return (0); 1061} 1062