isa.c revision 12092
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 1.54 1995/10/31 21:03:57 peter 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 <machine/cpu.h> 65#include <i386/isa/isa_device.h> 66#include <i386/isa/isa.h> 67#include <i386/isa/icu.h> 68#include <i386/isa/ic/i8237.h> 69#include <i386/isa/ic/i8042.h> 70#include <sys/devconf.h> 71#include "vector.h" 72 73/* 74** Register definitions for DMA controller 1 (channels 0..3): 75*/ 76#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 77#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 78#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 79#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 80 81/* 82** Register definitions for DMA controller 2 (channels 4..7): 83*/ 84#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 85#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 86#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 87#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 88 89/* 90 * XXX these defines should be in a central place. 91 */ 92#define read_eflags() ({u_long ef; \ 93 __asm("pushfl; popl %0" : "=a" (ef)); \ 94 ef; }) 95#define write_eflags(ef) __asm("pushl %0; popfl" : : "a" ((u_long)(ef))) 96 97u_long *intr_countp[ICU_LEN]; 98inthand2_t *intr_handler[ICU_LEN]; 99u_int intr_mask[ICU_LEN]; 100u_int* intr_mptr[ICU_LEN]; 101int intr_unit[ICU_LEN]; 102 103extern struct kern_devconf kdc_cpu0; 104 105struct kern_devconf kdc_isa0 = { 106 0, 0, 0, /* filled in by dev_attach */ 107 "isa", 0, { MDDT_BUS, 0 }, 108 0, 0, 0, BUS_EXTERNALLEN, 109 &kdc_cpu0, /* parent is the CPU */ 110 0, /* no parentdata */ 111 DC_BUSY, /* busses are always busy */ 112 "ISA or EISA bus", 113 DC_CLS_BUS /* class */ 114}; 115 116static inthand_t *fastintr[ICU_LEN] = { 117 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 118 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 119 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 120 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 121 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 122 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 123 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 124 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 125}; 126 127static inthand_t *slowintr[ICU_LEN] = { 128 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 129 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 130 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 131 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 132}; 133 134static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 135static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 136 int reconfig)); 137static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 138 int item, char const *whatnot, char const *reason, 139 char const *format)); 140static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 141 u_int checkbits)); 142static inthand2_t isa_strayintr; 143static void register_imask __P((struct isa_device *dvp, u_int mask)); 144 145/* 146 * print a conflict message 147 */ 148static void 149conflict(dvp, tmpdvp, item, whatnot, reason, format) 150 struct isa_device *dvp; 151 struct isa_device *tmpdvp; 152 int item; 153 char const *whatnot; 154 char const *reason; 155 char const *format; 156{ 157 printf("%s%d not %sed due to %s conflict with %s%d at ", 158 dvp->id_driver->name, dvp->id_unit, whatnot, reason, 159 tmpdvp->id_driver->name, tmpdvp->id_unit); 160 printf(format, item); 161 printf("\n"); 162} 163 164/* 165 * Check to see if things are already in use, like IRQ's, I/O addresses 166 * and Memory addresses. 167 */ 168static int 169haveseen(dvp, tmpdvp, checkbits) 170 struct isa_device *dvp; 171 struct isa_device *tmpdvp; 172 u_int checkbits; 173{ 174 /* 175 * Only check against devices that have already been found and are not 176 * unilaterally allowed to conflict anyway. 177 */ 178 if (tmpdvp->id_alive && !dvp->id_conflicts) { 179 char const *whatnot; 180 181 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 182 /* 183 * Check for I/O address conflict. We can only check the 184 * starting address of the device against the range of the 185 * device that has already been probed since we do not 186 * know how many I/O addresses this device uses. 187 */ 188 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 189 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 190 (dvp->id_iobase <= 191 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 192 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 193 "I/O address", "0x%x"); 194 return 1; 195 } 196 } 197 /* 198 * Check for Memory address conflict. We can check for 199 * range overlap, but it will not catch all cases since the 200 * driver may adjust the msize paramater during probe, for 201 * now we just check that the starting address does not 202 * fall within any allocated region. 203 * XXX could add a second check after the probe for overlap, 204 * since at that time we would know the full range. 205 * XXX KERNBASE is a hack, we should have vaddr in the table! 206 */ 207 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 208 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 209 (KERNBASE + dvp->id_maddr <= 210 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 211 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 212 whatnot, "maddr", "0x%x"); 213 return 1; 214 } 215 } 216 /* 217 * Check for IRQ conflicts. 218 */ 219 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 220 if (tmpdvp->id_irq == dvp->id_irq) { 221 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 222 whatnot, "irq", "%d"); 223 return 1; 224 } 225 } 226 /* 227 * Check for DRQ conflicts. 228 */ 229 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 230 if (tmpdvp->id_drq == dvp->id_drq) { 231 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 232 "drq", "%d"); 233 return 1; 234 } 235 } 236 } 237 return 0; 238} 239 240/* 241 * Search through all the isa_devtab_* tables looking for anything that 242 * conflicts with the current device. 243 */ 244 245int 246haveseen_isadev(dvp, checkbits) 247 struct isa_device *dvp; 248 u_int checkbits; 249{ 250 struct isa_device *tmpdvp; 251 int status = 0; 252 253 for (tmpdvp = isa_devtab_tty; tmpdvp->id_driver; tmpdvp++) { 254 status |= haveseen(dvp, tmpdvp, checkbits); 255 if (status) 256 return status; 257 } 258 for (tmpdvp = isa_devtab_bio; tmpdvp->id_driver; tmpdvp++) { 259 status |= haveseen(dvp, tmpdvp, checkbits); 260 if (status) 261 return status; 262 } 263 for (tmpdvp = isa_devtab_net; tmpdvp->id_driver; tmpdvp++) { 264 status |= haveseen(dvp, tmpdvp, checkbits); 265 if (status) 266 return status; 267 } 268 for (tmpdvp = isa_devtab_null; tmpdvp->id_driver; tmpdvp++) { 269 status |= haveseen(dvp, tmpdvp, checkbits); 270 if (status) 271 return status; 272 } 273 return(status); 274} 275 276/* 277 * Configure all ISA devices 278 */ 279void 280isa_configure() { 281 struct isa_device *dvp; 282 283 dev_attach(&kdc_isa0); 284 285 splhigh(); 286 enable_intr(); 287 INTREN(IRQ_SLAVE); 288 printf("Probing for devices on the ISA bus:\n"); 289 /* First probe all the sensitive probes */ 290 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 291 if (dvp->id_driver->sensitive_hw) 292 config_isadev(dvp, &tty_imask); 293 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 294 if (dvp->id_driver->sensitive_hw) 295 config_isadev(dvp, &bio_imask); 296 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 297 if (dvp->id_driver->sensitive_hw) 298 config_isadev(dvp, &net_imask); 299 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 300 if (dvp->id_driver->sensitive_hw) 301 config_isadev(dvp, (u_int *)NULL); 302 303 /* Then all the bad ones */ 304 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 305 if (!dvp->id_driver->sensitive_hw) 306 config_isadev(dvp, &tty_imask); 307 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 308 if (!dvp->id_driver->sensitive_hw) 309 config_isadev(dvp, &bio_imask); 310 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 311 if (!dvp->id_driver->sensitive_hw) 312 config_isadev(dvp, &net_imask); 313 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 314 if (!dvp->id_driver->sensitive_hw) 315 config_isadev(dvp, (u_int *)NULL); 316 317 bio_imask |= SWI_CLOCK_MASK; 318 net_imask |= SWI_NET_MASK; 319 tty_imask |= SWI_TTY_MASK; 320 321/* 322 * XXX we should really add the tty device to net_imask when the line is 323 * switched to SLIPDISC, and then remove it when it is switched away from 324 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 325 * of them is running slip. 326 * 327 * XXX actually, blocking all ttys during a splimp doesn't matter so much 328 * with sio because the serial interrupt layer doesn't use tty_imask. Only 329 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 330 * during spltty. 331 */ 332#include "sl.h" 333#include "ppp.h" 334 335#if (NSL > 0) 336 net_imask |= tty_imask; 337 tty_imask = net_imask; 338#endif 339 340 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 341 342 if (bootverbose) 343 printf("imasks: bio %x, tty %x, net %x\n", 344 bio_imask, tty_imask, net_imask); 345 346 /* 347 * Finish initializing intr_mask[]. Note that the partly 348 * constructed masks aren't actually used since we're at splhigh. 349 * For fully dynamic initialization, register_intr() and 350 * unregister_intr() will have to adjust the masks for _all_ 351 * interrupts and for tty_imask, etc. 352 */ 353 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 354 register_imask(dvp, tty_imask); 355 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 356 register_imask(dvp, bio_imask); 357 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 358 register_imask(dvp, net_imask); 359 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 360 register_imask(dvp, SWI_CLOCK_MASK); 361 spl0(); 362} 363 364/* 365 * Configure an ISA device. 366 */ 367 368 369static void 370config_isadev(isdp, mp) 371 struct isa_device *isdp; 372 u_int *mp; 373{ 374 config_isadev_c(isdp, mp, 0); 375} 376 377void 378reconfig_isadev(isdp, mp) 379 struct isa_device *isdp; 380 u_int *mp; 381{ 382 config_isadev_c(isdp, mp, 1); 383} 384 385static void 386config_isadev_c(isdp, mp, reconfig) 387 struct isa_device *isdp; 388 u_int *mp; 389 int reconfig; 390{ 391 u_int checkbits; 392 int id_alive; 393 int last_alive; 394 struct isa_driver *dp = isdp->id_driver; 395 396 checkbits = 0; 397 checkbits |= CC_DRQ; 398 checkbits |= CC_IOADDR; 399 checkbits |= CC_MEMADDR; 400 if (!isdp->id_enabled) { 401 printf("%s%d: disabled, not probed.\n", 402 dp->name, isdp->id_unit); 403 return; 404 } 405 if (!reconfig && haveseen_isadev(isdp, checkbits)) 406 return; 407 if (!reconfig && isdp->id_maddr) { 408 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 409 isdp->id_maddr += atdevbase; 410 } 411 if (reconfig) { 412 last_alive = isdp->id_alive; 413 isdp->id_reconfig = 1; 414 } 415 else { 416 last_alive = 0; 417 isdp->id_reconfig = 0; 418 } 419 id_alive = (*dp->probe)(isdp); 420 if (id_alive) { 421 /* 422 * Only print the I/O address range if id_alive != -1 423 * Right now this is a temporary fix just for the new 424 * NPX code so that if it finds a 486 that can use trap 425 * 16 it will not report I/O addresses. 426 * Rod Grimes 04/26/94 427 */ 428 if (!isdp->id_reconfig) { 429 printf("%s%d", dp->name, isdp->id_unit); 430 if (id_alive != -1) { 431 printf(" at 0x%x", isdp->id_iobase); 432 if ((isdp->id_iobase + id_alive - 1) != 433 isdp->id_iobase) { 434 printf("-0x%x", 435 isdp->id_iobase + id_alive - 1); 436 } 437 } 438 if (isdp->id_irq) 439 printf(" irq %d", ffs(isdp->id_irq) - 1); 440 if (isdp->id_drq != -1) 441 printf(" drq %d", isdp->id_drq); 442 if (isdp->id_maddr) 443 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 444 if (isdp->id_msize) 445 printf(" msize %d", isdp->id_msize); 446 if (isdp->id_flags) 447 printf(" flags 0x%x", isdp->id_flags); 448 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 449 printf(" on motherboard"); 450 } else if (isdp->id_iobase >= 0x1000 && 451 !(isdp->id_iobase & 0x300)) { 452 printf (" on eisa slot %d", 453 isdp->id_iobase >> 12); 454 } else { 455 printf (" on isa"); 456 } 457 printf("\n"); 458 /* 459 * Check for conflicts again. The driver may have 460 * changed *dvp. We should weaken the early check 461 * since the driver may have been able to change 462 * *dvp to avoid conflicts if given a chance. We 463 * already skip the early check for IRQs and force 464 * a check for IRQs in the next group of checks. 465 */ 466 checkbits |= CC_IRQ; 467 if (haveseen_isadev(isdp, checkbits)) 468 return; 469 isdp->id_alive = id_alive; 470 } 471 (*dp->attach)(isdp); 472 if (isdp->id_irq) { 473 if (mp) 474 INTRMASK(*mp, isdp->id_irq); 475 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 476 isdp->id_ri_flags, isdp->id_intr, 477 mp, isdp->id_unit); 478 INTREN(isdp->id_irq); 479 } 480 } else { 481 if (isdp->id_reconfig) { 482 (*dp->attach)(isdp); /* reconfiguration attach */ 483 } 484 if (!last_alive) { 485 if (!isdp->id_reconfig) { 486 printf("%s%d not found", dp->name, isdp->id_unit); 487 if (isdp->id_iobase) { 488 printf(" at 0x%x", isdp->id_iobase); 489 } 490 printf("\n"); 491 } 492 } 493 else { 494 /* This code has not been tested.... */ 495 if (isdp->id_irq) { 496 INTRDIS(isdp->id_irq); 497 unregister_intr(ffs(isdp->id_irq) - 1, 498 isdp->id_intr); 499 if (mp) 500 INTRUNMASK(*mp, isdp->id_irq); 501 } 502 } 503 } 504} 505 506/* 507 * Provide ISA-specific device information to user programs using the 508 * hw.devconf interface. 509 */ 510int 511isa_externalize(struct isa_device *id, void *userp, size_t *maxlen) 512{ 513 if(*maxlen < sizeof *id) { 514 return ENOMEM; 515 } 516 517 *maxlen -= sizeof *id; 518 return copyout(id, userp, sizeof *id); 519} 520 521/* 522 * This is used to forcibly reconfigure an ISA device. It currently just 523 * returns an error 'cos you can't do that yet. It is here to demonstrate 524 * what the `internalize' routine is supposed to do. 525 */ 526int 527isa_internalize(struct isa_device *id, void **userpp, size_t *len) 528{ 529 struct isa_device myid; 530 char *userp = *userpp; 531 int rv; 532 533 if(*len < sizeof *id) { 534 return EINVAL; 535 } 536 537 rv = copyin(userp, &myid, sizeof myid); 538 if(rv) return rv; 539 *userpp = userp + sizeof myid; 540 *len -= sizeof myid; 541 542 rv = EOPNOTSUPP; 543 /* code would go here to validate the configuration request */ 544 /* code would go here to actually perform the reconfiguration */ 545 return rv; 546} 547 548int 549isa_generic_externalize(struct proc *p, struct kern_devconf *kdc, 550 void *userp, size_t l) 551{ 552 return isa_externalize(kdc->kdc_isa, userp, &l); 553} 554 555/* 556 * Fill in default interrupt table (in case of spuruious interrupt 557 * during configuration of kernel, setup interrupt control unit 558 */ 559void 560isa_defaultirq() 561{ 562 int i; 563 564 /* icu vectors */ 565 for (i = 0; i < ICU_LEN; i++) 566 unregister_intr(i, (inthand2_t *)NULL); 567 568 /* initialize 8259's */ 569 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 570 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 571 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 572#ifdef AUTO_EOI_1 573 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 574#else 575 outb(IO_ICU1+1, 1); /* 8086 mode */ 576#endif 577 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 578 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 579 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 580 581 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 582 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 583 outb(IO_ICU2+1,2); /* my slave id is 2 */ 584#ifdef AUTO_EOI_2 585 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 586#else 587 outb(IO_ICU2+1,1); /* 8086 mode */ 588#endif 589 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 590 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 591} 592 593/* region of physical memory known to be contiguous */ 594vm_offset_t isaphysmem; 595static caddr_t dma_bounce[8]; /* XXX */ 596static char bounced[8]; /* XXX */ 597#define MAXDMASZ 512 /* XXX */ 598 599/* high byte of address is stored in this port for i-th dma channel */ 600static short dmapageport[8] = 601 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 602 603/* 604 * isa_dmacascade(): program 8237 DMA controller channel to accept 605 * external dma control by a board. 606 */ 607void isa_dmacascade(unsigned chan) 608{ 609 if (chan > 7) 610 panic("isa_dmacascade: impossible request"); 611 612 /* set dma channel mode, and set dma channel mode */ 613 if ((chan & 4) == 0) { 614 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 615 outb(DMA1_SMSK, chan); 616 } else { 617 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 618 outb(DMA2_SMSK, chan & 3); 619 } 620} 621 622static int 623isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); 624 625/* 626 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 627 * problems by using a bounce buffer. 628 */ 629void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 630{ vm_offset_t phys; 631 int waport; 632 caddr_t newaddr; 633 634 if ( chan > 7 635 || (chan < 4 && nbytes > (1<<16)) 636 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 637 panic("isa_dmastart: impossible request"); 638 639 if (isa_dmarangecheck(addr, nbytes, chan)) { 640 if (dma_bounce[chan] == 0) 641 dma_bounce[chan] = 642 (caddr_t) isaphysmem + NBPG*chan; 643 bounced[chan] = 1; 644 newaddr = dma_bounce[chan]; 645 *(int *) newaddr = 0; /* XXX */ 646 647 /* copy bounce buffer on write */ 648 if (!(flags & B_READ)) 649 bcopy(addr, newaddr, nbytes); 650 addr = newaddr; 651 } 652 653 /* translate to physical */ 654 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 655 656 if ((chan & 4) == 0) { 657 /* 658 * Program one of DMA channels 0..3. These are 659 * byte mode channels. 660 */ 661 /* set dma channel mode, and reset address ff */ 662 663 /* If B_RAW flag is set, then use autoinitialise mode */ 664 if (flags & B_RAW) { 665 if (flags & B_READ) 666 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 667 else 668 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 669 } 670 else 671 if (flags & B_READ) 672 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 673 else 674 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 675 outb(DMA1_FFC, 0); 676 677 /* send start address */ 678 waport = DMA1_CHN(chan); 679 outb(waport, phys); 680 outb(waport, phys>>8); 681 outb(dmapageport[chan], phys>>16); 682 683 /* send count */ 684 outb(waport + 1, --nbytes); 685 outb(waport + 1, nbytes>>8); 686 687 /* unmask channel */ 688 outb(DMA1_SMSK, chan); 689 } else { 690 /* 691 * Program one of DMA channels 4..7. These are 692 * word mode channels. 693 */ 694 /* set dma channel mode, and reset address ff */ 695 696 /* If B_RAW flag is set, then use autoinitialise mode */ 697 if (flags & B_RAW) { 698 if (flags & B_READ) 699 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 700 else 701 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 702 } 703 else 704 if (flags & B_READ) 705 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 706 else 707 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 708 outb(DMA2_FFC, 0); 709 710 /* send start address */ 711 waport = DMA2_CHN(chan - 4); 712 outb(waport, phys>>1); 713 outb(waport, phys>>9); 714 outb(dmapageport[chan], phys>>16); 715 716 /* send count */ 717 nbytes >>= 1; 718 outb(waport + 2, --nbytes); 719 outb(waport + 2, nbytes>>8); 720 721 /* unmask channel */ 722 outb(DMA2_SMSK, chan & 3); 723 } 724} 725 726void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 727{ 728 729 /* copy bounce buffer on read */ 730 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 731 if (bounced[chan]) { 732 bcopy(dma_bounce[chan], addr, nbytes); 733 bounced[chan] = 0; 734 } 735} 736 737/* 738 * Check for problems with the address range of a DMA transfer 739 * (non-contiguous physical pages, outside of bus address space, 740 * crossing DMA page boundaries). 741 * Return true if special handling needed. 742 */ 743 744static int 745isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 746 vm_offset_t phys, priorpage = 0, endva; 747 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 748 749 endva = (vm_offset_t)round_page(va + length); 750 for (; va < (caddr_t) endva ; va += NBPG) { 751 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 752#define ISARAM_END RAM_END 753 if (phys == 0) 754 panic("isa_dmacheck: no physical page present"); 755 if (phys >= ISARAM_END) 756 return (1); 757 if (priorpage) { 758 if (priorpage + NBPG != phys) 759 return (1); 760 /* check if crossing a DMA page boundary */ 761 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 762 return (1); 763 } 764 priorpage = phys; 765 } 766 return (0); 767} 768 769#define NMI_PARITY (1 << 7) 770#define NMI_IOCHAN (1 << 6) 771#define ENMI_WATCHDOG (1 << 7) 772#define ENMI_BUSTIMER (1 << 6) 773#define ENMI_IOSTATUS (1 << 5) 774 775/* 776 * Handle a NMI, possibly a machine check. 777 * return true to panic system, false to ignore. 778 */ 779int 780isa_nmi(cd) 781 int cd; 782{ 783 int isa_port = inb(0x61); 784 int eisa_port = inb(0x461); 785 if(isa_port & NMI_PARITY) { 786 panic("RAM parity error, likely hardware failure."); 787 } else if(isa_port & NMI_IOCHAN) { 788 panic("I/O channel check, likely hardware failure."); 789 } else if(eisa_port & ENMI_WATCHDOG) { 790 panic("EISA watchdog timer expired, likely hardware failure."); 791 } else if(eisa_port & ENMI_BUSTIMER) { 792 panic("EISA bus timeout, likely hardware failure."); 793 } else if(eisa_port & ENMI_IOSTATUS) { 794 panic("EISA I/O port status error."); 795 } else { 796 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 797 return(0); 798 } 799} 800 801/* 802 * Caught a stray interrupt, notify 803 */ 804static void 805isa_strayintr(d) 806 int d; 807{ 808 809 /* DON'T BOTHER FOR NOW! */ 810 /* for some reason, we get bursts of intr #7, even if not enabled! */ 811 /* 812 * Well the reason you got bursts of intr #7 is because someone 813 * raised an interrupt line and dropped it before the 8259 could 814 * prioritize it. This is documented in the intel data book. This 815 * means you have BAD hardware! I have changed this so that only 816 * the first 5 get logged, then it quits logging them, and puts 817 * out a special message. rgrimes 3/25/1993 818 */ 819 /* 820 * XXX TODO print a different message for #7 if it is for a 821 * glitch. Glitches can be distinguished from real #7's by 822 * testing that the in-service bit is _not_ set. The test 823 * must be done before sending an EOI so it can't be done if 824 * we are using AUTO_EOI_1. 825 */ 826 if (intrcnt[NR_DEVICES + d] <= 5) 827 log(LOG_ERR, "stray irq %d\n", d); 828 if (intrcnt[NR_DEVICES + d] == 5) 829 log(LOG_CRIT, 830 "too many stray irq %d's; not logging any more\n", d); 831} 832 833/* 834 * Find the highest priority enabled display device. Since we can't 835 * distinguish display devices from ttys, depend on display devices 836 * being sensitive and before sensitive non-display devices (if any) 837 * in isa_devtab_tty. 838 * 839 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 840 */ 841struct isa_device * 842find_display() 843{ 844 struct isa_device *dvp; 845 846 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 847 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 848 return (dvp); 849 return (NULL); 850} 851 852/* 853 * find an ISA device in a given isa_devtab_* table, given 854 * the table to search, the expected id_driver entry, and the unit number. 855 * 856 * this function is defined in isa_device.h, and this location is debatable; 857 * i put it there because it's useless w/o, and directly operates on 858 * the other stuff in that file. 859 * 860 */ 861 862struct isa_device *find_isadev(table, driverp, unit) 863 struct isa_device *table; 864 struct isa_driver *driverp; 865 int unit; 866{ 867 if (driverp == NULL) /* sanity check */ 868 return NULL; 869 870 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 871 if (table->id_driver == 0) 872 return NULL; 873 874 table++; 875 } 876 877 return table; 878} 879 880/* 881 * Return nonzero if a (masked) irq is pending for a given device. 882 */ 883int 884isa_irq_pending(dvp) 885 struct isa_device *dvp; 886{ 887 unsigned id_irq; 888 889 id_irq = dvp->id_irq; 890 if (id_irq & 0xff) 891 return (inb(IO_ICU1) & id_irq); 892 return (inb(IO_ICU2) & (id_irq >> 8)); 893} 894 895int 896update_intr_masks(void) 897{ 898 int intr, n=0; 899 u_int mask,*maskptr; 900 901 for (intr=0; intr < ICU_LEN; intr ++) { 902 if (intr==2) continue; 903 maskptr = intr_mptr[intr]; 904 if (!maskptr) continue; 905 mask = *maskptr; 906 if (mask != intr_mask[intr]) { 907#if 0 908 printf ("intr_mask[%2d] old=%08x new=%08x ptr=%p.\n", 909 intr, intr_mask[intr], mask, maskptr); 910#endif 911 intr_mask[intr]=mask; 912 n++; 913 } 914 915 } 916 return (n); 917} 918 919int 920register_intr(intr, device_id, flags, handler, maskptr, unit) 921 int intr; 922 int device_id; 923 u_int flags; 924 inthand2_t *handler; 925 u_int *maskptr; 926 int unit; 927{ 928 char *cp; 929 u_long ef; 930 int id; 931 u_int mask = (maskptr ? *maskptr : 0); 932 933 if ((u_int)intr >= ICU_LEN || intr == 2 934 || (u_int)device_id >= NR_DEVICES) 935 return (EINVAL); 936 if (intr_handler[intr] != isa_strayintr) 937 return (EBUSY); 938 ef = read_eflags(); 939 disable_intr(); 940 intr_countp[intr] = &intrcnt[device_id]; 941 intr_handler[intr] = handler; 942 intr_mptr[intr] = maskptr; 943 intr_mask[intr] = mask | (1 << intr); 944 intr_unit[intr] = unit; 945 setidt(ICU_OFFSET + intr, 946 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 947 SDT_SYS386IGT, SEL_KPL); 948 write_eflags(ef); 949 for (cp = intrnames, id = 0; id <= device_id; id++) 950 while (*cp++ != '\0') 951 ; 952 if (cp > eintrnames) 953 return (0); 954 if (intr < 10) { 955 cp[-3] = intr + '0'; 956 cp[-2] = ' '; 957 } else { 958 cp[-3] = '1'; 959 cp[-2] = intr - 10 + '0'; 960 } 961 return (0); 962} 963 964static void 965register_imask(dvp, mask) 966 struct isa_device *dvp; 967 u_int mask; 968{ 969 if (dvp->id_alive && dvp->id_irq) { 970 int intr; 971 972 intr = ffs(dvp->id_irq) - 1; 973 intr_mask[intr] = mask | (1 <<intr); 974 } 975 (void) update_intr_masks(); 976} 977 978int 979unregister_intr(intr, handler) 980 int intr; 981 inthand2_t *handler; 982{ 983 u_long ef; 984 985 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 986 return (EINVAL); 987 ef = read_eflags(); 988 disable_intr(); 989 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 990 intr_handler[intr] = isa_strayintr; 991 intr_mptr[intr] = NULL; 992 intr_mask[intr] = HWI_MASK | SWI_MASK; 993 intr_unit[intr] = intr; 994 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL); 995 write_eflags(ef); 996 return (0); 997} 998