Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/x86/isa/atpic.c
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1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2003 John Baldwin <jhb@FreeBSD.org> 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 /* 29 * PIC driver for the 8259A Master and Slave PICs in PC/AT machines. 30 */ 31 32 #include <sys/cdefs.h> 33 __FBSDID("$FreeBSD$"); 34 35 #include "opt_auto_eoi.h" 36 #include "opt_isa.h" 37 38 #include <sys/param.h> 39 #include <sys/systm.h> 40 #include <sys/asan.h> 41 #include <sys/bus.h> 42 #include <sys/interrupt.h> 43 #include <sys/kernel.h> 44 #include <sys/lock.h> 45 #include <sys/module.h> 46 #include <sys/msan.h> 47 48 #include <machine/cpufunc.h> 49 #include <machine/frame.h> 50 #include <machine/intr_machdep.h> 51 #include <machine/md_var.h> 52 #include <machine/resource.h> 53 #include <machine/segments.h> 54 55 #include <dev/ic/i8259.h> 56 #include <x86/isa/icu.h> 57 #include <isa/isareg.h> 58 #include <isa/isavar.h> 59 60 #ifdef __amd64__ 61 #define SDT_ATPIC SDT_SYSIGT 62 #define GSEL_ATPIC 0 63 #else 64 #define SDT_ATPIC SDT_SYS386IGT 65 #define GSEL_ATPIC GSEL(GCODE_SEL, SEL_KPL) 66 #endif 67 68 #define MASTER 0 69 #define SLAVE 1 70 71 #define IMEN_MASK(ai) (IRQ_MASK((ai)->at_irq)) 72 73 #define NUM_ISA_IRQS 16 74 75 static void atpic_init(void *dummy); 76 77 inthand_t 78 IDTVEC(atpic_intr0), IDTVEC(atpic_intr1), IDTVEC(atpic_intr2), 79 IDTVEC(atpic_intr3), IDTVEC(atpic_intr4), IDTVEC(atpic_intr5), 80 IDTVEC(atpic_intr6), IDTVEC(atpic_intr7), IDTVEC(atpic_intr8), 81 IDTVEC(atpic_intr9), IDTVEC(atpic_intr10), IDTVEC(atpic_intr11), 82 IDTVEC(atpic_intr12), IDTVEC(atpic_intr13), IDTVEC(atpic_intr14), 83 IDTVEC(atpic_intr15); 84 /* XXXKIB i386 uses stubs until pti comes */ 85 inthand_t 86 IDTVEC(atpic_intr0_pti), IDTVEC(atpic_intr1_pti), 87 IDTVEC(atpic_intr2_pti), IDTVEC(atpic_intr3_pti), 88 IDTVEC(atpic_intr4_pti), IDTVEC(atpic_intr5_pti), 89 IDTVEC(atpic_intr6_pti), IDTVEC(atpic_intr7_pti), 90 IDTVEC(atpic_intr8_pti), IDTVEC(atpic_intr9_pti), 91 IDTVEC(atpic_intr10_pti), IDTVEC(atpic_intr11_pti), 92 IDTVEC(atpic_intr12_pti), IDTVEC(atpic_intr13_pti), 93 IDTVEC(atpic_intr14_pti), IDTVEC(atpic_intr15_pti); 94 95 #define IRQ(ap, ai) ((ap)->at_irqbase + (ai)->at_irq) 96 97 #define ATPIC(io, base, eoi) { \ 98 .at_pic = { \ 99 .pic_register_sources = atpic_register_sources, \ 100 .pic_enable_source = atpic_enable_source, \ 101 .pic_disable_source = atpic_disable_source, \ 102 .pic_eoi_source = (eoi), \ 103 .pic_enable_intr = atpic_enable_intr, \ 104 .pic_disable_intr = atpic_disable_intr, \ 105 .pic_vector = atpic_vector, \ 106 .pic_source_pending = atpic_source_pending, \ 107 .pic_resume = atpic_resume, \ 108 .pic_config_intr = atpic_config_intr, \ 109 .pic_assign_cpu = atpic_assign_cpu \ 110 }, \ 111 .at_ioaddr = (io), \ 112 .at_irqbase = (base), \ 113 .at_intbase = IDT_IO_INTS + (base), \ 114 .at_imen = 0xff, \ 115 } 116 117 #define INTSRC(irq) \ 118 { { &atpics[(irq) / 8].at_pic }, IDTVEC(atpic_intr ## irq ), \ 119 IDTVEC(atpic_intr ## irq ## _pti), (irq) % 8 } 120 121 struct atpic { 122 struct pic at_pic; 123 int at_ioaddr; 124 int at_irqbase; 125 uint8_t at_intbase; 126 uint8_t at_imen; 127 }; 128 129 struct atpic_intsrc { 130 struct intsrc at_intsrc; 131 inthand_t *at_intr, *at_intr_pti; 132 int at_irq; /* Relative to PIC base. */ 133 enum intr_trigger at_trigger; 134 u_long at_count; 135 u_long at_straycount; 136 }; 137 138 static void atpic_register_sources(struct pic *pic); 139 static void atpic_enable_source(struct intsrc *isrc); 140 static void atpic_disable_source(struct intsrc *isrc, int eoi); 141 static void atpic_eoi_master(struct intsrc *isrc); 142 static void atpic_eoi_slave(struct intsrc *isrc); 143 static void atpic_enable_intr(struct intsrc *isrc); 144 static void atpic_disable_intr(struct intsrc *isrc); 145 static int atpic_vector(struct intsrc *isrc); 146 static void atpic_resume(struct pic *pic, bool suspend_cancelled); 147 static int atpic_source_pending(struct intsrc *isrc); 148 static int atpic_config_intr(struct intsrc *isrc, enum intr_trigger trig, 149 enum intr_polarity pol); 150 static int atpic_assign_cpu(struct intsrc *isrc, u_int apic_id); 151 static void i8259_init(struct atpic *pic, int slave); 152 153 static struct atpic atpics[] = { 154 ATPIC(IO_ICU1, 0, atpic_eoi_master), 155 ATPIC(IO_ICU2, 8, atpic_eoi_slave) 156 }; 157 158 static struct atpic_intsrc atintrs[] = { 159 INTSRC(0), 160 INTSRC(1), 161 INTSRC(2), 162 INTSRC(3), 163 INTSRC(4), 164 INTSRC(5), 165 INTSRC(6), 166 INTSRC(7), 167 INTSRC(8), 168 INTSRC(9), 169 INTSRC(10), 170 INTSRC(11), 171 INTSRC(12), 172 INTSRC(13), 173 INTSRC(14), 174 INTSRC(15), 175 }; 176 177 CTASSERT(nitems(atintrs) == NUM_ISA_IRQS); 178 179 static __inline void 180 _atpic_eoi_master(struct intsrc *isrc) 181 { 182 183 KASSERT(isrc->is_pic == &atpics[MASTER].at_pic, 184 ("%s: mismatched pic", __func__)); 185 #ifndef AUTO_EOI_1 186 outb(atpics[MASTER].at_ioaddr, OCW2_EOI); 187 #endif 188 } 189 190 /* 191 * The data sheet says no auto-EOI on slave, but it sometimes works. 192 * So, if AUTO_EOI_2 is enabled, we use it. 193 */ 194 static __inline void 195 _atpic_eoi_slave(struct intsrc *isrc) 196 { 197 198 KASSERT(isrc->is_pic == &atpics[SLAVE].at_pic, 199 ("%s: mismatched pic", __func__)); 200 #ifndef AUTO_EOI_2 201 outb(atpics[SLAVE].at_ioaddr, OCW2_EOI); 202 #ifndef AUTO_EOI_1 203 outb(atpics[MASTER].at_ioaddr, OCW2_EOI); 204 #endif 205 #endif 206 } 207 208 static void 209 atpic_register_sources(struct pic *pic) 210 { 211 struct atpic *ap = (struct atpic *)pic; 212 struct atpic_intsrc *ai; 213 int i; 214 215 /* 216 * If any of the ISA IRQs have an interrupt source already, then 217 * assume that the I/O APICs are being used and don't register any 218 * of our interrupt sources. This makes sure we don't accidentally 219 * use mixed mode. The "accidental" use could otherwise occur on 220 * machines that route the ACPI SCI interrupt to a different ISA 221 * IRQ (at least one machine routes it to IRQ 13) thus disabling 222 * that APIC ISA routing and allowing the ATPIC source for that IRQ 223 * to leak through. We used to depend on this feature for routing 224 * IRQ0 via mixed mode, but now we don't use mixed mode at all. 225 * 226 * To avoid the slave not register sources after the master 227 * registers its sources, register all IRQs when this function is 228 * called on the master. 229 */ 230 if (ap != &atpics[MASTER]) 231 return; 232 for (i = 0; i < NUM_ISA_IRQS; i++) 233 if (intr_lookup_source(i) != NULL) 234 return; 235 236 /* Loop through all interrupt sources and add them. */ 237 for (i = 0, ai = atintrs; i < NUM_ISA_IRQS; i++, ai++) { 238 if (i == ICU_SLAVEID) 239 continue; 240 intr_register_source(&ai->at_intsrc); 241 } 242 } 243 244 static void 245 atpic_enable_source(struct intsrc *isrc) 246 { 247 struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc; 248 struct atpic *ap = (struct atpic *)isrc->is_pic; 249 250 spinlock_enter(); 251 if (ap->at_imen & IMEN_MASK(ai)) { 252 ap->at_imen &= ~IMEN_MASK(ai); 253 outb(ap->at_ioaddr + ICU_IMR_OFFSET, ap->at_imen); 254 } 255 spinlock_exit(); 256 } 257 258 static void 259 atpic_disable_source(struct intsrc *isrc, int eoi) 260 { 261 struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc; 262 struct atpic *ap = (struct atpic *)isrc->is_pic; 263 264 spinlock_enter(); 265 if (ai->at_trigger != INTR_TRIGGER_EDGE) { 266 ap->at_imen |= IMEN_MASK(ai); 267 outb(ap->at_ioaddr + ICU_IMR_OFFSET, ap->at_imen); 268 } 269 270 /* 271 * Take care to call these functions directly instead of through 272 * a function pointer. All of the referenced variables should 273 * still be hot in the cache. 274 */ 275 if (eoi == PIC_EOI) { 276 if (isrc->is_pic == &atpics[MASTER].at_pic) 277 _atpic_eoi_master(isrc); 278 else 279 _atpic_eoi_slave(isrc); 280 } 281 282 spinlock_exit(); 283 } 284 285 static void 286 atpic_eoi_master(struct intsrc *isrc) 287 { 288 #ifndef AUTO_EOI_1 289 spinlock_enter(); 290 _atpic_eoi_master(isrc); 291 spinlock_exit(); 292 #endif 293 } 294 295 static void 296 atpic_eoi_slave(struct intsrc *isrc) 297 { 298 #ifndef AUTO_EOI_2 299 spinlock_enter(); 300 _atpic_eoi_slave(isrc); 301 spinlock_exit(); 302 #endif 303 } 304 305 static void 306 atpic_enable_intr(struct intsrc *isrc) 307 { 308 } 309 310 static void 311 atpic_disable_intr(struct intsrc *isrc) 312 { 313 } 314 315 static int 316 atpic_vector(struct intsrc *isrc) 317 { 318 struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc; 319 struct atpic *ap = (struct atpic *)isrc->is_pic; 320 321 return (IRQ(ap, ai)); 322 } 323 324 static int 325 atpic_source_pending(struct intsrc *isrc) 326 { 327 struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc; 328 struct atpic *ap = (struct atpic *)isrc->is_pic; 329 330 return (inb(ap->at_ioaddr) & IMEN_MASK(ai)); 331 } 332 333 static void 334 atpic_resume(struct pic *pic, bool suspend_cancelled) 335 { 336 struct atpic *ap = (struct atpic *)pic; 337 338 i8259_init(ap, ap == &atpics[SLAVE]); 339 if (ap == &atpics[SLAVE] && elcr_found) 340 elcr_resume(); 341 } 342 343 static int 344 atpic_config_intr(struct intsrc *isrc, enum intr_trigger trig, 345 enum intr_polarity pol) 346 { 347 struct atpic_intsrc *ai = (struct atpic_intsrc *)isrc; 348 u_int vector; 349 350 /* Map conforming values to edge/hi and sanity check the values. */ 351 if (trig == INTR_TRIGGER_CONFORM) 352 trig = INTR_TRIGGER_EDGE; 353 if (pol == INTR_POLARITY_CONFORM) 354 pol = INTR_POLARITY_HIGH; 355 vector = atpic_vector(isrc); 356 if ((trig == INTR_TRIGGER_EDGE && pol == INTR_POLARITY_LOW) || 357 (trig == INTR_TRIGGER_LEVEL && pol == INTR_POLARITY_HIGH)) { 358 printf( 359 "atpic: Mismatched config for IRQ%u: trigger %s, polarity %s\n", 360 vector, trig == INTR_TRIGGER_EDGE ? "edge" : "level", 361 pol == INTR_POLARITY_HIGH ? "high" : "low"); 362 return (EINVAL); 363 } 364 365 /* If there is no change, just return. */ 366 if (ai->at_trigger == trig) 367 return (0); 368 369 /* 370 * Certain IRQs can never be level/lo, so don't try to set them 371 * that way if asked. At least some ELCR registers ignore setting 372 * these bits as well. 373 */ 374 if ((vector == 0 || vector == 1 || vector == 2 || vector == 13) && 375 trig == INTR_TRIGGER_LEVEL) { 376 if (bootverbose) 377 printf( 378 "atpic: Ignoring invalid level/low configuration for IRQ%u\n", 379 vector); 380 return (EINVAL); 381 } 382 if (!elcr_found) { 383 if (bootverbose) 384 printf("atpic: No ELCR to configure IRQ%u as %s\n", 385 vector, trig == INTR_TRIGGER_EDGE ? "edge/high" : 386 "level/low"); 387 return (ENXIO); 388 } 389 if (bootverbose) 390 printf("atpic: Programming IRQ%u as %s\n", vector, 391 trig == INTR_TRIGGER_EDGE ? "edge/high" : "level/low"); 392 spinlock_enter(); 393 elcr_write_trigger(atpic_vector(isrc), trig); 394 ai->at_trigger = trig; 395 spinlock_exit(); 396 return (0); 397 } 398 399 static int 400 atpic_assign_cpu(struct intsrc *isrc, u_int apic_id) 401 { 402 403 /* 404 * 8259A's are only used in UP in which case all interrupts always 405 * go to the sole CPU and this function shouldn't even be called. 406 */ 407 panic("%s: bad cookie", __func__); 408 } 409 410 static void 411 i8259_init(struct atpic *pic, int slave) 412 { 413 int imr_addr; 414 415 /* Reset the PIC and program with next four bytes. */ 416 spinlock_enter(); 417 outb(pic->at_ioaddr, ICW1_RESET | ICW1_IC4); 418 imr_addr = pic->at_ioaddr + ICU_IMR_OFFSET; 419 420 /* Start vector. */ 421 outb(imr_addr, pic->at_intbase); 422 423 /* 424 * Setup slave links. For the master pic, indicate what line 425 * the slave is configured on. For the slave indicate 426 * which line on the master we are connected to. 427 */ 428 if (slave) 429 outb(imr_addr, ICU_SLAVEID); 430 else 431 outb(imr_addr, IRQ_MASK(ICU_SLAVEID)); 432 433 /* Set mode. */ 434 if (slave) 435 outb(imr_addr, SLAVE_MODE); 436 else 437 outb(imr_addr, MASTER_MODE); 438 439 /* Set interrupt enable mask. */ 440 outb(imr_addr, pic->at_imen); 441 442 /* Reset is finished, default to IRR on read. */ 443 outb(pic->at_ioaddr, OCW3_SEL | OCW3_RR); 444 445 /* OCW2_L1 sets priority order to 3-7, 0-2 (com2 first). */ 446 if (!slave) 447 outb(pic->at_ioaddr, OCW2_R | OCW2_SL | OCW2_L1); 448 449 spinlock_exit(); 450 } 451 452 void 453 atpic_startup(void) 454 { 455 struct atpic_intsrc *ai; 456 int i; 457 458 /* Start off with all interrupts disabled. */ 459 i8259_init(&atpics[MASTER], 0); 460 i8259_init(&atpics[SLAVE], 1); 461 atpic_enable_source((struct intsrc *)&atintrs[ICU_SLAVEID]); 462 463 /* Install low-level interrupt handlers for all of our IRQs. */ 464 for (i = 0, ai = atintrs; i < NUM_ISA_IRQS; i++, ai++) { 465 if (i == ICU_SLAVEID) 466 continue; 467 ai->at_intsrc.is_count = &ai->at_count; 468 ai->at_intsrc.is_straycount = &ai->at_straycount; 469 setidt(((struct atpic *)ai->at_intsrc.is_pic)->at_intbase + 470 ai->at_irq, pti ? ai->at_intr_pti : ai->at_intr, SDT_ATPIC, 471 SEL_KPL, GSEL_ATPIC); 472 } 473 474 /* 475 * Look for an ELCR. If we find one, update the trigger modes. 476 * If we don't find one, assume that IRQs 0, 1, 2, and 13 are 477 * edge triggered and that everything else is level triggered. 478 * We only use the trigger information to reprogram the ELCR if 479 * we have one and as an optimization to avoid masking edge 480 * triggered interrupts. For the case that we don't have an ELCR, 481 * it doesn't hurt to mask an edge triggered interrupt, so we 482 * assume level trigger for any interrupt that we aren't sure is 483 * edge triggered. 484 */ 485 if (elcr_found) { 486 for (i = 0, ai = atintrs; i < NUM_ISA_IRQS; i++, ai++) 487 ai->at_trigger = elcr_read_trigger(i); 488 } else { 489 for (i = 0, ai = atintrs; i < NUM_ISA_IRQS; i++, ai++) 490 switch (i) { 491 case 0: 492 case 1: 493 case 2: 494 case 8: 495 case 13: 496 ai->at_trigger = INTR_TRIGGER_EDGE; 497 break; 498 default: 499 ai->at_trigger = INTR_TRIGGER_LEVEL; 500 break; 501 } 502 } 503 } 504 505 static void 506 atpic_init(void *dummy __unused) 507 { 508 509 /* 510 * Register our PICs, even if we aren't going to use any of their 511 * pins so that they are suspended and resumed. 512 */ 513 if (intr_register_pic(&atpics[0].at_pic) != 0 || 514 intr_register_pic(&atpics[1].at_pic) != 0) 515 panic("Unable to register ATPICs"); 516 517 if (num_io_irqs == 0) 518 num_io_irqs = NUM_ISA_IRQS; 519 } 520 SYSINIT(atpic_init, SI_SUB_INTR, SI_ORDER_FOURTH, atpic_init, NULL); 521 522 void 523 atpic_handle_intr(u_int vector, struct trapframe *frame) 524 { 525 struct intsrc *isrc; 526 527 kasan_mark(frame, sizeof(*frame), sizeof(*frame), 0); 528 kmsan_mark(frame, sizeof(*frame), KMSAN_STATE_INITED); 529 trap_check_kstack(); 530 531 KASSERT(vector < NUM_ISA_IRQS, ("unknown int %u\n", vector)); 532 isrc = &atintrs[vector].at_intsrc; 533 534 /* 535 * If we don't have an event, see if this is a spurious 536 * interrupt. 537 */ 538 if (isrc->is_event == NULL && (vector == 7 || vector == 15)) { 539 int port, isr; 540 541 /* 542 * Read the ISR register to see if IRQ 7/15 is really 543 * pending. Reset read register back to IRR when done. 544 */ 545 port = ((struct atpic *)isrc->is_pic)->at_ioaddr; 546 spinlock_enter(); 547 outb(port, OCW3_SEL | OCW3_RR | OCW3_RIS); 548 isr = inb(port); 549 outb(port, OCW3_SEL | OCW3_RR); 550 spinlock_exit(); 551 if ((isr & IRQ_MASK(7)) == 0) 552 return; 553 } 554 intr_execute_handlers(isrc, frame); 555 } 556 557 #ifdef DEV_ISA 558 /* 559 * Bus attachment for the ISA PIC. 560 */ 561 static struct isa_pnp_id atpic_ids[] = { 562 { 0x0000d041 /* PNP0000 */, "AT interrupt controller" }, 563 { 0 } 564 }; 565 566 static int 567 atpic_probe(device_t dev) 568 { 569 int result; 570 571 result = ISA_PNP_PROBE(device_get_parent(dev), dev, atpic_ids); 572 if (result <= 0) 573 device_quiet(dev); 574 return (result); 575 } 576 577 /* 578 * We might be granted IRQ 2, as this is typically consumed by chaining 579 * between the two PIC components. If we're using the APIC, however, 580 * this may not be the case, and as such we should free the resource. 581 * (XXX untested) 582 * 583 * The generic ISA attachment code will handle allocating any other resources 584 * that we don't explicitly claim here. 585 */ 586 static int 587 atpic_attach(device_t dev) 588 { 589 struct resource *res; 590 int rid; 591 592 /* Try to allocate our IRQ and then free it. */ 593 rid = 0; 594 res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid, 0); 595 if (res != NULL) 596 bus_release_resource(dev, SYS_RES_IRQ, rid, res); 597 return (0); 598 } 599 600 static device_method_t atpic_methods[] = { 601 /* Device interface */ 602 DEVMETHOD(device_probe, atpic_probe), 603 DEVMETHOD(device_attach, atpic_attach), 604 DEVMETHOD(device_detach, bus_generic_detach), 605 DEVMETHOD(device_shutdown, bus_generic_shutdown), 606 DEVMETHOD(device_suspend, bus_generic_suspend), 607 DEVMETHOD(device_resume, bus_generic_resume), 608 { 0, 0 } 609 }; 610 611 static driver_t atpic_driver = { 612 "atpic", 613 atpic_methods, 614 1, /* no softc */ 615 }; 616 617 DRIVER_MODULE(atpic, isa, atpic_driver, 0, 0); 618 DRIVER_MODULE(atpic, acpi, atpic_driver, 0, 0); 619 ISA_PNP_INFO(atpic_ids); 620 #endif /* DEV_ISA */
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