isa.c revision 12929
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 1.58 1995/12/07 12:46:01 davidg 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/sysctl.h> 54#include <sys/proc.h> 55#include <sys/conf.h> 56#include <sys/file.h> 57#include <sys/buf.h> 58#include <sys/uio.h> 59#include <sys/syslog.h> 60#include <sys/malloc.h> 61#include <sys/rlist.h> 62#include <machine/segments.h> 63#include <vm/vm.h> 64#include <vm/vm_param.h> 65#include <vm/pmap.h> 66#include <machine/spl.h> 67#include <machine/cpu.h> 68#include <i386/isa/isa_device.h> 69#include <i386/isa/isa.h> 70#include <i386/isa/icu.h> 71#include <i386/isa/ic/i8237.h> 72#include <i386/isa/ic/i8042.h> 73#include <sys/devconf.h> 74#include "vector.h" 75 76/* 77** Register definitions for DMA controller 1 (channels 0..3): 78*/ 79#define DMA1_CHN(c) (IO_DMA1 + 1*(2*(c))) /* addr reg for channel c */ 80#define DMA1_SMSK (IO_DMA1 + 1*10) /* single mask register */ 81#define DMA1_MODE (IO_DMA1 + 1*11) /* mode register */ 82#define DMA1_FFC (IO_DMA1 + 1*12) /* clear first/last FF */ 83 84/* 85** Register definitions for DMA controller 2 (channels 4..7): 86*/ 87#define DMA2_CHN(c) (IO_DMA2 + 2*(2*(c))) /* addr reg for channel c */ 88#define DMA2_SMSK (IO_DMA2 + 2*10) /* single mask register */ 89#define DMA2_MODE (IO_DMA2 + 2*11) /* mode register */ 90#define DMA2_FFC (IO_DMA2 + 2*12) /* clear first/last FF */ 91 92/* 93 * XXX these defines should be in a central place. 94 */ 95#define read_eflags() ({u_long ef; \ 96 __asm("pushfl; popl %0" : "=a" (ef)); \ 97 ef; }) 98#define write_eflags(ef) __asm("pushl %0; popfl" : : "a" ((u_long)(ef))) 99 100u_long *intr_countp[ICU_LEN]; 101inthand2_t *intr_handler[ICU_LEN]; 102u_int intr_mask[ICU_LEN]; 103u_int* intr_mptr[ICU_LEN]; 104int intr_unit[ICU_LEN]; 105 106extern struct kern_devconf kdc_cpu0; 107 108struct kern_devconf kdc_isa0 = { 109 0, 0, 0, /* filled in by dev_attach */ 110 "isa", 0, { MDDT_BUS, 0 }, 111 0, 0, 0, BUS_EXTERNALLEN, 112 &kdc_cpu0, /* parent is the CPU */ 113 0, /* no parentdata */ 114 DC_BUSY, /* busses are always busy */ 115 "ISA or EISA bus", 116 DC_CLS_BUS /* class */ 117}; 118 119static inthand_t *fastintr[ICU_LEN] = { 120 &IDTVEC(fastintr0), &IDTVEC(fastintr1), 121 &IDTVEC(fastintr2), &IDTVEC(fastintr3), 122 &IDTVEC(fastintr4), &IDTVEC(fastintr5), 123 &IDTVEC(fastintr6), &IDTVEC(fastintr7), 124 &IDTVEC(fastintr8), &IDTVEC(fastintr9), 125 &IDTVEC(fastintr10), &IDTVEC(fastintr11), 126 &IDTVEC(fastintr12), &IDTVEC(fastintr13), 127 &IDTVEC(fastintr14), &IDTVEC(fastintr15) 128}; 129 130static inthand_t *slowintr[ICU_LEN] = { 131 &IDTVEC(intr0), &IDTVEC(intr1), &IDTVEC(intr2), &IDTVEC(intr3), 132 &IDTVEC(intr4), &IDTVEC(intr5), &IDTVEC(intr6), &IDTVEC(intr7), 133 &IDTVEC(intr8), &IDTVEC(intr9), &IDTVEC(intr10), &IDTVEC(intr11), 134 &IDTVEC(intr12), &IDTVEC(intr13), &IDTVEC(intr14), &IDTVEC(intr15) 135}; 136 137static void config_isadev __P((struct isa_device *isdp, u_int *mp)); 138static void config_isadev_c __P((struct isa_device *isdp, u_int *mp, 139 int reconfig)); 140static void conflict __P((struct isa_device *dvp, struct isa_device *tmpdvp, 141 int item, char const *whatnot, char const *reason, 142 char const *format)); 143static int haveseen __P((struct isa_device *dvp, struct isa_device *tmpdvp, 144 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 already 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 and are not 179 * unilaterally allowed to conflict anyway. 180 */ 181 if (tmpdvp->id_alive && !dvp->id_conflicts) { 182 char const *whatnot; 183 184 whatnot = checkbits & CC_ATTACH ? "attach" : "prob"; 185 /* 186 * Check for I/O address conflict. We can only check the 187 * starting address of the device against the range of the 188 * device that has already been probed since we do not 189 * know how many I/O addresses this device uses. 190 */ 191 if (checkbits & CC_IOADDR && tmpdvp->id_alive != -1) { 192 if ((dvp->id_iobase >= tmpdvp->id_iobase) && 193 (dvp->id_iobase <= 194 (tmpdvp->id_iobase + tmpdvp->id_alive - 1))) { 195 conflict(dvp, tmpdvp, dvp->id_iobase, whatnot, 196 "I/O address", "0x%x"); 197 return 1; 198 } 199 } 200 /* 201 * Check for Memory address conflict. We can check for 202 * range overlap, but it will not catch all cases since the 203 * driver may adjust the msize paramater during probe, for 204 * now we just check that the starting address does not 205 * fall within any allocated region. 206 * XXX could add a second check after the probe for overlap, 207 * since at that time we would know the full range. 208 * XXX KERNBASE is a hack, we should have vaddr in the table! 209 */ 210 if (checkbits & CC_MEMADDR && tmpdvp->id_maddr) { 211 if ((KERNBASE + dvp->id_maddr >= tmpdvp->id_maddr) && 212 (KERNBASE + dvp->id_maddr <= 213 (tmpdvp->id_maddr + tmpdvp->id_msize - 1))) { 214 conflict(dvp, tmpdvp, (int)dvp->id_maddr, 215 whatnot, "maddr", "0x%x"); 216 return 1; 217 } 218 } 219 /* 220 * Check for IRQ conflicts. 221 */ 222 if (checkbits & CC_IRQ && tmpdvp->id_irq) { 223 if (tmpdvp->id_irq == dvp->id_irq) { 224 conflict(dvp, tmpdvp, ffs(dvp->id_irq) - 1, 225 whatnot, "irq", "%d"); 226 return 1; 227 } 228 } 229 /* 230 * Check for DRQ conflicts. 231 */ 232 if (checkbits & CC_DRQ && tmpdvp->id_drq != -1) { 233 if (tmpdvp->id_drq == dvp->id_drq) { 234 conflict(dvp, tmpdvp, dvp->id_drq, whatnot, 235 "drq", "%d"); 236 return 1; 237 } 238 } 239 } 240 return 0; 241} 242 243/* 244 * Search through all the isa_devtab_* tables looking for anything that 245 * conflicts with the current device. 246 */ 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 return(status); 277} 278 279/* 280 * Configure all ISA devices 281 */ 282void 283isa_configure() { 284 struct isa_device *dvp; 285 286 dev_attach(&kdc_isa0); 287 288 splhigh(); 289 enable_intr(); 290 INTREN(IRQ_SLAVE); 291 printf("Probing for devices on the ISA bus:\n"); 292 /* First probe all the sensitive probes */ 293 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 294 if (dvp->id_driver->sensitive_hw) 295 config_isadev(dvp, &tty_imask); 296 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 297 if (dvp->id_driver->sensitive_hw) 298 config_isadev(dvp, &bio_imask); 299 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 300 if (dvp->id_driver->sensitive_hw) 301 config_isadev(dvp, &net_imask); 302 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 303 if (dvp->id_driver->sensitive_hw) 304 config_isadev(dvp, (u_int *)NULL); 305 306 /* Then all the bad ones */ 307 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 308 if (!dvp->id_driver->sensitive_hw) 309 config_isadev(dvp, &tty_imask); 310 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 311 if (!dvp->id_driver->sensitive_hw) 312 config_isadev(dvp, &bio_imask); 313 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 314 if (!dvp->id_driver->sensitive_hw) 315 config_isadev(dvp, &net_imask); 316 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 317 if (!dvp->id_driver->sensitive_hw) 318 config_isadev(dvp, (u_int *)NULL); 319 320 bio_imask |= SWI_CLOCK_MASK; 321 net_imask |= SWI_NET_MASK; 322 tty_imask |= SWI_TTY_MASK; 323 324/* 325 * XXX we should really add the tty device to net_imask when the line is 326 * switched to SLIPDISC, and then remove it when it is switched away from 327 * SLIPDISC. No need to block out ALL ttys during a splimp when only one 328 * of them is running slip. 329 * 330 * XXX actually, blocking all ttys during a splimp doesn't matter so much 331 * with sio because the serial interrupt layer doesn't use tty_imask. Only 332 * non-serial ttys suffer. It's more stupid that ALL 'net's are blocked 333 * during spltty. 334 */ 335#include "sl.h" 336#include "ppp.h" 337 338#if (NSL > 0) 339 net_imask |= tty_imask; 340 tty_imask = net_imask; 341#endif 342 343 /* bio_imask |= tty_imask ; can some tty devices use buffers? */ 344 345 if (bootverbose) 346 printf("imasks: bio %x, tty %x, net %x\n", 347 bio_imask, tty_imask, net_imask); 348 349 /* 350 * Finish initializing intr_mask[]. Note that the partly 351 * constructed masks aren't actually used since we're at splhigh. 352 * For fully dynamic initialization, register_intr() and 353 * unregister_intr() will have to adjust the masks for _all_ 354 * interrupts and for tty_imask, etc. 355 */ 356 for (dvp = isa_devtab_tty; dvp->id_driver; dvp++) 357 register_imask(dvp, tty_imask); 358 for (dvp = isa_devtab_bio; dvp->id_driver; dvp++) 359 register_imask(dvp, bio_imask); 360 for (dvp = isa_devtab_net; dvp->id_driver; dvp++) 361 register_imask(dvp, net_imask); 362 for (dvp = isa_devtab_null; dvp->id_driver; dvp++) 363 register_imask(dvp, SWI_CLOCK_MASK); 364 spl0(); 365} 366 367/* 368 * Configure an ISA device. 369 */ 370 371 372static void 373config_isadev(isdp, mp) 374 struct isa_device *isdp; 375 u_int *mp; 376{ 377 config_isadev_c(isdp, mp, 0); 378} 379 380void 381reconfig_isadev(isdp, mp) 382 struct isa_device *isdp; 383 u_int *mp; 384{ 385 config_isadev_c(isdp, mp, 1); 386} 387 388static void 389config_isadev_c(isdp, mp, reconfig) 390 struct isa_device *isdp; 391 u_int *mp; 392 int reconfig; 393{ 394 u_int checkbits; 395 int id_alive; 396 int last_alive; 397 struct isa_driver *dp = isdp->id_driver; 398 399 checkbits = 0; 400 checkbits |= CC_DRQ; 401 checkbits |= CC_IOADDR; 402 checkbits |= CC_MEMADDR; 403 if (!isdp->id_enabled) { 404 printf("%s%d: disabled, not probed.\n", 405 dp->name, isdp->id_unit); 406 return; 407 } 408 if (!reconfig && haveseen_isadev(isdp, checkbits)) 409 return; 410 if (!reconfig && isdp->id_maddr) { 411 isdp->id_maddr -= 0xa0000; /* XXX should be a define */ 412 isdp->id_maddr += atdevbase; 413 } 414 if (reconfig) { 415 last_alive = isdp->id_alive; 416 isdp->id_reconfig = 1; 417 } 418 else { 419 last_alive = 0; 420 isdp->id_reconfig = 0; 421 } 422 id_alive = (*dp->probe)(isdp); 423 if (id_alive) { 424 /* 425 * Only print the I/O address range if id_alive != -1 426 * Right now this is a temporary fix just for the new 427 * NPX code so that if it finds a 486 that can use trap 428 * 16 it will not report I/O addresses. 429 * Rod Grimes 04/26/94 430 */ 431 if (!isdp->id_reconfig) { 432 printf("%s%d", dp->name, isdp->id_unit); 433 if (id_alive != -1) { 434 printf(" at 0x%x", isdp->id_iobase); 435 if ((isdp->id_iobase + id_alive - 1) != 436 isdp->id_iobase) { 437 printf("-0x%x", 438 isdp->id_iobase + id_alive - 1); 439 } 440 } 441 if (isdp->id_irq) 442 printf(" irq %d", ffs(isdp->id_irq) - 1); 443 if (isdp->id_drq != -1) 444 printf(" drq %d", isdp->id_drq); 445 if (isdp->id_maddr) 446 printf(" maddr 0x%lx", kvtop(isdp->id_maddr)); 447 if (isdp->id_msize) 448 printf(" msize %d", isdp->id_msize); 449 if (isdp->id_flags) 450 printf(" flags 0x%x", isdp->id_flags); 451 if (isdp->id_iobase && !(isdp->id_iobase & 0xf300)) { 452 printf(" on motherboard"); 453 } else if (isdp->id_iobase >= 0x1000 && 454 !(isdp->id_iobase & 0x300)) { 455 printf (" on eisa slot %d", 456 isdp->id_iobase >> 12); 457 } else { 458 printf (" on isa"); 459 } 460 printf("\n"); 461 /* 462 * Check for conflicts again. The driver may have 463 * changed *dvp. We should weaken the early check 464 * since the driver may have been able to change 465 * *dvp to avoid conflicts if given a chance. We 466 * already skip the early check for IRQs and force 467 * a check for IRQs in the next group of checks. 468 */ 469 checkbits |= CC_IRQ; 470 if (haveseen_isadev(isdp, checkbits)) 471 return; 472 isdp->id_alive = id_alive; 473 } 474 (*dp->attach)(isdp); 475 if (isdp->id_irq) { 476 if (mp) 477 INTRMASK(*mp, isdp->id_irq); 478 register_intr(ffs(isdp->id_irq) - 1, isdp->id_id, 479 isdp->id_ri_flags, isdp->id_intr, 480 mp, isdp->id_unit); 481 INTREN(isdp->id_irq); 482 } 483 } else { 484 if (isdp->id_reconfig) { 485 (*dp->attach)(isdp); /* reconfiguration attach */ 486 } 487 if (!last_alive) { 488 if (!isdp->id_reconfig) { 489 printf("%s%d not found", dp->name, isdp->id_unit); 490 if (isdp->id_iobase) { 491 printf(" at 0x%x", isdp->id_iobase); 492 } 493 printf("\n"); 494 } 495 } 496 else { 497 /* This code has not been tested.... */ 498 if (isdp->id_irq) { 499 INTRDIS(isdp->id_irq); 500 unregister_intr(ffs(isdp->id_irq) - 1, 501 isdp->id_intr); 502 if (mp) 503 INTRUNMASK(*mp, isdp->id_irq); 504 } 505 } 506 } 507} 508 509/* 510 * Provide ISA-specific device information to user programs using the 511 * hw.devconf interface. 512 */ 513int 514isa_externalize(struct isa_device *id, struct sysctl_req *req) 515{ 516 return (SYSCTL_OUT(req, id, sizeof *id)); 517} 518 519/* 520 * This is used to forcibly reconfigure an ISA device. It currently just 521 * returns an error 'cos you can't do that yet. It is here to demonstrate 522 * what the `internalize' routine is supposed to do. 523 */ 524int 525isa_internalize(struct isa_device *id, struct sysctl_req *req) 526{ 527 struct isa_device myid; 528 int rv; 529 530 rv = SYSCTL_IN(req, &myid, sizeof *id); 531 if(rv) 532 return rv; 533 534 rv = EOPNOTSUPP; 535 /* code would go here to validate the configuration request */ 536 /* code would go here to actually perform the reconfiguration */ 537 return rv; 538} 539 540int 541isa_generic_externalize(struct kern_devconf *kdc, struct sysctl_req *req) 542{ 543 return isa_externalize(kdc->kdc_isa, req); 544} 545 546/* 547 * Fill in default interrupt table (in case of spuruious interrupt 548 * during configuration of kernel, setup interrupt control unit 549 */ 550void 551isa_defaultirq() 552{ 553 int i; 554 555 /* icu vectors */ 556 for (i = 0; i < ICU_LEN; i++) 557 unregister_intr(i, (inthand2_t *)NULL); 558 559 /* initialize 8259's */ 560 outb(IO_ICU1, 0x11); /* reset; program device, four bytes */ 561 outb(IO_ICU1+1, NRSVIDT); /* starting at this vector index */ 562 outb(IO_ICU1+1, 1<<2); /* slave on line 2 */ 563#ifdef AUTO_EOI_1 564 outb(IO_ICU1+1, 2 | 1); /* auto EOI, 8086 mode */ 565#else 566 outb(IO_ICU1+1, 1); /* 8086 mode */ 567#endif 568 outb(IO_ICU1+1, 0xff); /* leave interrupts masked */ 569 outb(IO_ICU1, 0x0a); /* default to IRR on read */ 570 outb(IO_ICU1, 0xc0 | (3 - 1)); /* pri order 3-7, 0-2 (com2 first) */ 571 572 outb(IO_ICU2, 0x11); /* reset; program device, four bytes */ 573 outb(IO_ICU2+1, NRSVIDT+8); /* staring at this vector index */ 574 outb(IO_ICU2+1,2); /* my slave id is 2 */ 575#ifdef AUTO_EOI_2 576 outb(IO_ICU2+1, 2 | 1); /* auto EOI, 8086 mode */ 577#else 578 outb(IO_ICU2+1,1); /* 8086 mode */ 579#endif 580 outb(IO_ICU2+1, 0xff); /* leave interrupts masked */ 581 outb(IO_ICU2, 0x0a); /* default to IRR on read */ 582} 583 584/* region of physical memory known to be contiguous */ 585vm_offset_t isaphysmem; 586static caddr_t dma_bounce[8]; /* XXX */ 587static char bounced[8]; /* XXX */ 588#define MAXDMASZ 512 /* XXX */ 589 590/* high byte of address is stored in this port for i-th dma channel */ 591static short dmapageport[8] = 592 { 0x87, 0x83, 0x81, 0x82, 0x8f, 0x8b, 0x89, 0x8a }; 593 594/* 595 * isa_dmacascade(): program 8237 DMA controller channel to accept 596 * external dma control by a board. 597 */ 598void isa_dmacascade(unsigned chan) 599{ 600 if (chan > 7) 601 panic("isa_dmacascade: impossible request"); 602 603 /* set dma channel mode, and set dma channel mode */ 604 if ((chan & 4) == 0) { 605 outb(DMA1_MODE, DMA37MD_CASCADE | chan); 606 outb(DMA1_SMSK, chan); 607 } else { 608 outb(DMA2_MODE, DMA37MD_CASCADE | (chan & 3)); 609 outb(DMA2_SMSK, chan & 3); 610 } 611} 612 613static int 614isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan); 615 616/* 617 * isa_dmastart(): program 8237 DMA controller channel, avoid page alignment 618 * problems by using a bounce buffer. 619 */ 620void isa_dmastart(int flags, caddr_t addr, unsigned nbytes, unsigned chan) 621{ vm_offset_t phys; 622 int waport; 623 caddr_t newaddr; 624 625 if ( chan > 7 626 || (chan < 4 && nbytes > (1<<16)) 627 || (chan >= 4 && (nbytes > (1<<17) || (u_int)addr & 1))) 628 panic("isa_dmastart: impossible request"); 629 630 if (isa_dmarangecheck(addr, nbytes, chan)) { 631 if (dma_bounce[chan] == 0) 632 dma_bounce[chan] = 633 (caddr_t) isaphysmem + NBPG*chan; 634 bounced[chan] = 1; 635 newaddr = dma_bounce[chan]; 636 *(int *) newaddr = 0; /* XXX */ 637 638 /* copy bounce buffer on write */ 639 if (!(flags & B_READ)) 640 bcopy(addr, newaddr, nbytes); 641 addr = newaddr; 642 } 643 644 /* translate to physical */ 645 phys = pmap_extract(pmap_kernel(), (vm_offset_t)addr); 646 647 if ((chan & 4) == 0) { 648 /* 649 * Program one of DMA channels 0..3. These are 650 * byte mode channels. 651 */ 652 /* set dma channel mode, and reset address ff */ 653 654 /* If B_RAW flag is set, then use autoinitialise mode */ 655 if (flags & B_RAW) { 656 if (flags & B_READ) 657 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_WRITE|chan); 658 else 659 outb(DMA1_MODE, DMA37MD_AUTO|DMA37MD_READ|chan); 660 } 661 else 662 if (flags & B_READ) 663 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|chan); 664 else 665 outb(DMA1_MODE, DMA37MD_SINGLE|DMA37MD_READ|chan); 666 outb(DMA1_FFC, 0); 667 668 /* send start address */ 669 waport = DMA1_CHN(chan); 670 outb(waport, phys); 671 outb(waport, phys>>8); 672 outb(dmapageport[chan], phys>>16); 673 674 /* send count */ 675 outb(waport + 1, --nbytes); 676 outb(waport + 1, nbytes>>8); 677 678 /* unmask channel */ 679 outb(DMA1_SMSK, chan); 680 } else { 681 /* 682 * Program one of DMA channels 4..7. These are 683 * word mode channels. 684 */ 685 /* set dma channel mode, and reset address ff */ 686 687 /* If B_RAW flag is set, then use autoinitialise mode */ 688 if (flags & B_RAW) { 689 if (flags & B_READ) 690 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_WRITE|(chan&3)); 691 else 692 outb(DMA2_MODE, DMA37MD_AUTO|DMA37MD_READ|(chan&3)); 693 } 694 else 695 if (flags & B_READ) 696 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_WRITE|(chan&3)); 697 else 698 outb(DMA2_MODE, DMA37MD_SINGLE|DMA37MD_READ|(chan&3)); 699 outb(DMA2_FFC, 0); 700 701 /* send start address */ 702 waport = DMA2_CHN(chan - 4); 703 outb(waport, phys>>1); 704 outb(waport, phys>>9); 705 outb(dmapageport[chan], phys>>16); 706 707 /* send count */ 708 nbytes >>= 1; 709 outb(waport + 2, --nbytes); 710 outb(waport + 2, nbytes>>8); 711 712 /* unmask channel */ 713 outb(DMA2_SMSK, chan & 3); 714 } 715} 716 717void isa_dmadone(int flags, caddr_t addr, int nbytes, int chan) 718{ 719 720 /* copy bounce buffer on read */ 721 /*if ((flags & (B_PHYS|B_READ)) == (B_PHYS|B_READ))*/ 722 if (bounced[chan]) { 723 bcopy(dma_bounce[chan], addr, nbytes); 724 bounced[chan] = 0; 725 } 726} 727 728/* 729 * Check for problems with the address range of a DMA transfer 730 * (non-contiguous physical pages, outside of bus address space, 731 * crossing DMA page boundaries). 732 * Return true if special handling needed. 733 */ 734 735static int 736isa_dmarangecheck(caddr_t va, unsigned length, unsigned chan) { 737 vm_offset_t phys, priorpage = 0, endva; 738 u_int dma_pgmsk = (chan & 4) ? ~(128*1024-1) : ~(64*1024-1); 739 740 endva = (vm_offset_t)round_page(va + length); 741 for (; va < (caddr_t) endva ; va += NBPG) { 742 phys = trunc_page(pmap_extract(pmap_kernel(), (vm_offset_t)va)); 743#define ISARAM_END RAM_END 744 if (phys == 0) 745 panic("isa_dmacheck: no physical page present"); 746 if (phys >= ISARAM_END) 747 return (1); 748 if (priorpage) { 749 if (priorpage + NBPG != phys) 750 return (1); 751 /* check if crossing a DMA page boundary */ 752 if (((u_int)priorpage ^ (u_int)phys) & dma_pgmsk) 753 return (1); 754 } 755 priorpage = phys; 756 } 757 return (0); 758} 759 760#define NMI_PARITY (1 << 7) 761#define NMI_IOCHAN (1 << 6) 762#define ENMI_WATCHDOG (1 << 7) 763#define ENMI_BUSTIMER (1 << 6) 764#define ENMI_IOSTATUS (1 << 5) 765 766/* 767 * Handle a NMI, possibly a machine check. 768 * return true to panic system, false to ignore. 769 */ 770int 771isa_nmi(cd) 772 int cd; 773{ 774 int isa_port = inb(0x61); 775 int eisa_port = inb(0x461); 776 if(isa_port & NMI_PARITY) { 777 panic("RAM parity error, likely hardware failure."); 778 } else if(isa_port & NMI_IOCHAN) { 779 panic("I/O channel check, likely hardware failure."); 780 } else if(eisa_port & ENMI_WATCHDOG) { 781 panic("EISA watchdog timer expired, likely hardware failure."); 782 } else if(eisa_port & ENMI_BUSTIMER) { 783 panic("EISA bus timeout, likely hardware failure."); 784 } else if(eisa_port & ENMI_IOSTATUS) { 785 panic("EISA I/O port status error."); 786 } else { 787 printf("\nNMI ISA %x, EISA %x\n", isa_port, eisa_port); 788 return(0); 789 } 790} 791 792/* 793 * Caught a stray interrupt, notify 794 */ 795static void 796isa_strayintr(d) 797 int d; 798{ 799 800 /* DON'T BOTHER FOR NOW! */ 801 /* for some reason, we get bursts of intr #7, even if not enabled! */ 802 /* 803 * Well the reason you got bursts of intr #7 is because someone 804 * raised an interrupt line and dropped it before the 8259 could 805 * prioritize it. This is documented in the intel data book. This 806 * means you have BAD hardware! I have changed this so that only 807 * the first 5 get logged, then it quits logging them, and puts 808 * out a special message. rgrimes 3/25/1993 809 */ 810 /* 811 * XXX TODO print a different message for #7 if it is for a 812 * glitch. Glitches can be distinguished from real #7's by 813 * testing that the in-service bit is _not_ set. The test 814 * must be done before sending an EOI so it can't be done if 815 * we are using AUTO_EOI_1. 816 */ 817 if (intrcnt[NR_DEVICES + d] <= 5) 818 log(LOG_ERR, "stray irq %d\n", d); 819 if (intrcnt[NR_DEVICES + d] == 5) 820 log(LOG_CRIT, 821 "too many stray irq %d's; not logging any more\n", d); 822} 823 824/* 825 * Find the highest priority enabled display device. Since we can't 826 * distinguish display devices from ttys, depend on display devices 827 * being sensitive and before sensitive non-display devices (if any) 828 * in isa_devtab_tty. 829 * 830 * XXX we should add capability flags IAMDISPLAY and ISUPPORTCONSOLES. 831 */ 832struct isa_device * 833find_display() 834{ 835 struct isa_device *dvp; 836 837 for (dvp = isa_devtab_tty; dvp->id_driver != NULL; dvp++) 838 if (dvp->id_driver->sensitive_hw && dvp->id_enabled) 839 return (dvp); 840 return (NULL); 841} 842 843/* 844 * find an ISA device in a given isa_devtab_* table, given 845 * the table to search, the expected id_driver entry, and the unit number. 846 * 847 * this function is defined in isa_device.h, and this location is debatable; 848 * i put it there because it's useless w/o, and directly operates on 849 * the other stuff in that file. 850 * 851 */ 852 853struct isa_device *find_isadev(table, driverp, unit) 854 struct isa_device *table; 855 struct isa_driver *driverp; 856 int unit; 857{ 858 if (driverp == NULL) /* sanity check */ 859 return NULL; 860 861 while ((table->id_driver != driverp) || (table->id_unit != unit)) { 862 if (table->id_driver == 0) 863 return NULL; 864 865 table++; 866 } 867 868 return table; 869} 870 871/* 872 * Return nonzero if a (masked) irq is pending for a given device. 873 */ 874int 875isa_irq_pending(dvp) 876 struct isa_device *dvp; 877{ 878 unsigned id_irq; 879 880 id_irq = dvp->id_irq; 881 if (id_irq & 0xff) 882 return (inb(IO_ICU1) & id_irq); 883 return (inb(IO_ICU2) & (id_irq >> 8)); 884} 885 886int 887update_intr_masks(void) 888{ 889 int intr, n=0; 890 u_int mask,*maskptr; 891 892 for (intr=0; intr < ICU_LEN; intr ++) { 893 if (intr==2) continue; 894 maskptr = intr_mptr[intr]; 895 if (!maskptr) continue; 896 *maskptr |= 1 << intr; 897 mask = *maskptr; 898 if (mask != intr_mask[intr]) { 899#if 0 900 printf ("intr_mask[%2d] old=%08x new=%08x ptr=%p.\n", 901 intr, intr_mask[intr], mask, maskptr); 902#endif 903 intr_mask[intr]=mask; 904 n++; 905 } 906 907 } 908 return (n); 909} 910 911int 912register_intr(intr, device_id, flags, handler, maskptr, unit) 913 int intr; 914 int device_id; 915 u_int flags; 916 inthand2_t *handler; 917 u_int *maskptr; 918 int unit; 919{ 920 char *cp; 921 u_long ef; 922 int id; 923 u_int mask = (maskptr ? *maskptr : 0); 924 925 if ((u_int)intr >= ICU_LEN || intr == 2 926 || (u_int)device_id >= NR_DEVICES) 927 return (EINVAL); 928 if (intr_handler[intr] != isa_strayintr) 929 return (EBUSY); 930 ef = read_eflags(); 931 disable_intr(); 932 intr_countp[intr] = &intrcnt[device_id]; 933 intr_handler[intr] = handler; 934 intr_mptr[intr] = maskptr; 935 intr_mask[intr] = mask | (1 << intr); 936 intr_unit[intr] = unit; 937 setidt(ICU_OFFSET + intr, 938 flags & RI_FAST ? fastintr[intr] : slowintr[intr], 939 SDT_SYS386IGT, SEL_KPL, GSEL(GCODE_SEL, SEL_KPL)); 940 write_eflags(ef); 941 for (cp = intrnames, id = 0; id <= device_id; id++) 942 while (*cp++ != '\0') 943 ; 944 if (cp > eintrnames) 945 return (0); 946 if (intr < 10) { 947 cp[-3] = intr + '0'; 948 cp[-2] = ' '; 949 } else { 950 cp[-3] = '1'; 951 cp[-2] = intr - 10 + '0'; 952 } 953 return (0); 954} 955 956static void 957register_imask(dvp, mask) 958 struct isa_device *dvp; 959 u_int mask; 960{ 961 if (dvp->id_alive && dvp->id_irq) { 962 int intr; 963 964 intr = ffs(dvp->id_irq) - 1; 965 intr_mask[intr] = mask | (1 <<intr); 966 } 967 (void) update_intr_masks(); 968} 969 970int 971unregister_intr(intr, handler) 972 int intr; 973 inthand2_t *handler; 974{ 975 u_long ef; 976 977 if ((u_int)intr >= ICU_LEN || handler != intr_handler[intr]) 978 return (EINVAL); 979 ef = read_eflags(); 980 disable_intr(); 981 intr_countp[intr] = &intrcnt[NR_DEVICES + intr]; 982 intr_handler[intr] = isa_strayintr; 983 intr_mptr[intr] = NULL; 984 intr_mask[intr] = HWI_MASK | SWI_MASK; 985 intr_unit[intr] = intr; 986 setidt(ICU_OFFSET + intr, slowintr[intr], SDT_SYS386IGT, SEL_KPL, 987 GSEL(GCODE_SEL, SEL_KPL)); 988 write_eflags(ef); 989 return (0); 990} 991