| 1 | /* |
| 2 | * Copyright (c) 1996, by Steve Passe |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * Redistribution and use in source and binary forms, with or without |
| 6 | * modification, are permitted provided that the following conditions |
| 7 | * are met: |
| 8 | * 1. Redistributions of source code must retain the above copyright |
| 9 | * notice, this list of conditions and the following disclaimer. |
| 10 | * 2. The name of the developer may NOT be used to endorse or promote products |
| 11 | * derived from this software without specific prior written permission. |
| 12 | * |
| 13 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 14 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 15 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 16 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 17 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 18 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 19 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 20 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 21 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 22 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 23 | * SUCH DAMAGE. |
| 24 | * |
| 25 | * $FreeBSD: src/sys/i386/i386/mpapic.c,v 1.37.2.7 2003/01/25 02:31:47 peter Exp $ |
| 26 | */ |
| 27 | |
| 28 | #include <sys/param.h> |
| 29 | #include <sys/systm.h> |
| 30 | #include <sys/kernel.h> |
| 31 | #include <sys/bus.h> |
| 32 | #include <sys/machintr.h> |
| 33 | #include <sys/thread2.h> |
| 34 | |
| 35 | #include <machine/pmap.h> |
| 36 | #include <machine_base/isa/isa_intr.h> |
| 37 | #include <machine_base/icu/icu_var.h> |
| 38 | #include <machine_base/apic/lapic.h> |
| 39 | #include <machine_base/apic/ioapic.h> |
| 40 | #include <machine_base/apic/ioapic_abi.h> |
| 41 | #include <machine_base/apic/apicvar.h> |
| 42 | |
| 43 | #define IOAPIC_COUNT_MAX 16 |
| 44 | #define IOAPIC_ID_MASK (IOAPIC_COUNT_MAX - 1) |
| 45 | |
| 46 | struct ioapic_info { |
| 47 | int io_idx; |
| 48 | int io_apic_id; |
| 49 | void *io_addr; |
| 50 | int io_npin; |
| 51 | int io_gsi_base; |
| 52 | |
| 53 | TAILQ_ENTRY(ioapic_info) io_link; |
| 54 | }; |
| 55 | TAILQ_HEAD(ioapic_info_list, ioapic_info); |
| 56 | |
| 57 | struct ioapic_intsrc { |
| 58 | int int_gsi; |
| 59 | enum intr_trigger int_trig; |
| 60 | enum intr_polarity int_pola; |
| 61 | }; |
| 62 | |
| 63 | struct ioapic_conf { |
| 64 | struct ioapic_info_list ioc_list; |
| 65 | struct ioapic_intsrc ioc_intsrc[ISA_IRQ_CNT]; |
| 66 | }; |
| 67 | |
| 68 | static int ioapic_config(void); |
| 69 | static void ioapic_setup(const struct ioapic_info *); |
| 70 | static int ioapic_alloc_apic_id(int); |
| 71 | static void ioapic_set_apic_id(const struct ioapic_info *); |
| 72 | static void ioapic_gsi_setup(int); |
| 73 | static const struct ioapic_info * |
| 74 | ioapic_gsi_search(int); |
| 75 | static void ioapic_pin_prog(void *, int, int, |
| 76 | enum intr_trigger, enum intr_polarity, uint32_t, int); |
| 77 | |
| 78 | static struct ioapic_conf ioapic_conf; |
| 79 | |
| 80 | static TAILQ_HEAD(, ioapic_enumerator) ioapic_enumerators = |
| 81 | TAILQ_HEAD_INITIALIZER(ioapic_enumerators); |
| 82 | |
| 83 | int ioapic_enable = 1; /* I/O APIC is enabled by default */ |
| 84 | |
| 85 | static int |
| 86 | ioapic_config(void) |
| 87 | { |
| 88 | struct ioapic_enumerator *e; |
| 89 | struct ioapic_info *info; |
| 90 | int start_apic_id = 0; |
| 91 | int error, i, probe; |
| 92 | register_t ef = 0; |
| 93 | |
| 94 | TAILQ_INIT(&ioapic_conf.ioc_list); |
| 95 | for (i = 0; i < ISA_IRQ_CNT; ++i) |
| 96 | ioapic_conf.ioc_intsrc[i].int_gsi = -1; |
| 97 | |
| 98 | probe = 1; |
| 99 | TUNABLE_INT_FETCH("hw.ioapic_probe", &probe); |
| 100 | if (!probe) { |
| 101 | kprintf("IOAPIC: warning I/O APIC will not be probed\n"); |
| 102 | return ENXIO; |
| 103 | } |
| 104 | |
| 105 | TAILQ_FOREACH(e, &ioapic_enumerators, ioapic_link) { |
| 106 | error = e->ioapic_probe(e); |
| 107 | if (!error) |
| 108 | break; |
| 109 | } |
| 110 | if (e == NULL) { |
| 111 | kprintf("IOAPIC: can't find I/O APIC\n"); |
| 112 | return ENXIO; |
| 113 | } |
| 114 | |
| 115 | crit_enter(); |
| 116 | |
| 117 | ef = read_rflags(); |
| 118 | cpu_disable_intr(); |
| 119 | |
| 120 | /* |
| 121 | * Switch to I/O APIC MachIntrABI and reconfigure |
| 122 | * the default IDT entries. |
| 123 | */ |
| 124 | MachIntrABI = MachIntrABI_IOAPIC; |
| 125 | MachIntrABI.setdefault(); |
| 126 | |
| 127 | e->ioapic_enumerate(e); |
| 128 | |
| 129 | /* |
| 130 | * Setup index |
| 131 | */ |
| 132 | i = 0; |
| 133 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) |
| 134 | info->io_idx = i++; |
| 135 | |
| 136 | if (i > IOAPIC_COUNT_MAX) |
| 137 | panic("ioapic_config: more than 16 I/O APIC\n"); |
| 138 | |
| 139 | /* |
| 140 | * Setup APIC ID |
| 141 | */ |
| 142 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { |
| 143 | int apic_id; |
| 144 | |
| 145 | apic_id = ioapic_alloc_apic_id(start_apic_id); |
| 146 | if (apic_id == NAPICID) { |
| 147 | kprintf("IOAPIC: can't alloc APIC ID for " |
| 148 | "%dth I/O APIC\n", info->io_idx); |
| 149 | break; |
| 150 | } |
| 151 | info->io_apic_id = apic_id; |
| 152 | |
| 153 | start_apic_id = apic_id + 1; |
| 154 | } |
| 155 | if (info != NULL) { |
| 156 | /* |
| 157 | * xAPIC allows I/O APIC's APIC ID to be same |
| 158 | * as the LAPIC's APIC ID |
| 159 | */ |
| 160 | kprintf("IOAPIC: use xAPIC model to alloc APIC ID " |
| 161 | "for I/O APIC\n"); |
| 162 | |
| 163 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) |
| 164 | info->io_apic_id = info->io_idx; |
| 165 | } |
| 166 | |
| 167 | /* |
| 168 | * Warning about any GSI holes |
| 169 | */ |
| 170 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { |
| 171 | const struct ioapic_info *prev_info; |
| 172 | |
| 173 | prev_info = TAILQ_PREV(info, ioapic_info_list, io_link); |
| 174 | if (prev_info != NULL) { |
| 175 | if (info->io_gsi_base != |
| 176 | prev_info->io_gsi_base + prev_info->io_npin) { |
| 177 | kprintf("IOAPIC: warning gsi hole " |
| 178 | "[%d, %d]\n", |
| 179 | prev_info->io_gsi_base + |
| 180 | prev_info->io_npin, |
| 181 | info->io_gsi_base - 1); |
| 182 | } |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | if (bootverbose) { |
| 187 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { |
| 188 | kprintf("IOAPIC: idx %d, apic id %d, " |
| 189 | "gsi base %d, npin %d\n", |
| 190 | info->io_idx, |
| 191 | info->io_apic_id, |
| 192 | info->io_gsi_base, |
| 193 | info->io_npin); |
| 194 | } |
| 195 | } |
| 196 | |
| 197 | /* |
| 198 | * Setup all I/O APIC |
| 199 | */ |
| 200 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) |
| 201 | ioapic_setup(info); |
| 202 | ioapic_abi_fixup_irqmap(); |
| 203 | |
| 204 | write_rflags(ef); |
| 205 | |
| 206 | MachIntrABI.cleanup(); |
| 207 | |
| 208 | crit_exit(); |
| 209 | |
| 210 | return 0; |
| 211 | } |
| 212 | |
| 213 | void |
| 214 | ioapic_enumerator_register(struct ioapic_enumerator *ne) |
| 215 | { |
| 216 | struct ioapic_enumerator *e; |
| 217 | |
| 218 | TAILQ_FOREACH(e, &ioapic_enumerators, ioapic_link) { |
| 219 | if (e->ioapic_prio < ne->ioapic_prio) { |
| 220 | TAILQ_INSERT_BEFORE(e, ne, ioapic_link); |
| 221 | return; |
| 222 | } |
| 223 | } |
| 224 | TAILQ_INSERT_TAIL(&ioapic_enumerators, ne, ioapic_link); |
| 225 | } |
| 226 | |
| 227 | void |
| 228 | ioapic_add(void *addr, int gsi_base, int npin) |
| 229 | { |
| 230 | struct ioapic_info *info, *ninfo; |
| 231 | int gsi_end; |
| 232 | |
| 233 | gsi_end = gsi_base + npin - 1; |
| 234 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { |
| 235 | if ((gsi_base >= info->io_gsi_base && |
| 236 | gsi_base < info->io_gsi_base + info->io_npin) || |
| 237 | (gsi_end >= info->io_gsi_base && |
| 238 | gsi_end < info->io_gsi_base + info->io_npin)) { |
| 239 | panic("ioapic_add: overlapped gsi, base %d npin %d, " |
| 240 | "hit base %d, npin %d\n", gsi_base, npin, |
| 241 | info->io_gsi_base, info->io_npin); |
| 242 | } |
| 243 | if (info->io_addr == addr) |
| 244 | panic("ioapic_add: duplicated addr %p\n", addr); |
| 245 | } |
| 246 | |
| 247 | ninfo = kmalloc(sizeof(*ninfo), M_DEVBUF, M_WAITOK | M_ZERO); |
| 248 | ninfo->io_addr = addr; |
| 249 | ninfo->io_npin = npin; |
| 250 | ninfo->io_gsi_base = gsi_base; |
| 251 | ninfo->io_apic_id = -1; |
| 252 | |
| 253 | /* |
| 254 | * Create IOAPIC list in ascending order of GSI base |
| 255 | */ |
| 256 | TAILQ_FOREACH_REVERSE(info, &ioapic_conf.ioc_list, |
| 257 | ioapic_info_list, io_link) { |
| 258 | if (ninfo->io_gsi_base > info->io_gsi_base) { |
| 259 | TAILQ_INSERT_AFTER(&ioapic_conf.ioc_list, |
| 260 | info, ninfo, io_link); |
| 261 | break; |
| 262 | } |
| 263 | } |
| 264 | if (info == NULL) |
| 265 | TAILQ_INSERT_HEAD(&ioapic_conf.ioc_list, ninfo, io_link); |
| 266 | } |
| 267 | |
| 268 | void |
| 269 | ioapic_intsrc(int irq, int gsi, enum intr_trigger trig, enum intr_polarity pola) |
| 270 | { |
| 271 | struct ioapic_intsrc *int_src; |
| 272 | |
| 273 | KKASSERT(irq < ISA_IRQ_CNT); |
| 274 | int_src = &ioapic_conf.ioc_intsrc[irq]; |
| 275 | |
| 276 | if (gsi == 0) { |
| 277 | /* Don't allow mixed mode */ |
| 278 | kprintf("IOAPIC: warning intsrc irq %d -> gsi 0\n", irq); |
| 279 | return; |
| 280 | } |
| 281 | |
| 282 | if (int_src->int_gsi != -1) { |
| 283 | if (int_src->int_gsi != gsi) { |
| 284 | kprintf("IOAPIC: warning intsrc irq %d, gsi " |
| 285 | "%d -> %d\n", irq, int_src->int_gsi, gsi); |
| 286 | } |
| 287 | if (int_src->int_trig != trig) { |
| 288 | kprintf("IOAPIC: warning intsrc irq %d, trig " |
| 289 | "%s -> %s\n", irq, |
| 290 | intr_str_trigger(int_src->int_trig), |
| 291 | intr_str_trigger(trig)); |
| 292 | } |
| 293 | if (int_src->int_pola != pola) { |
| 294 | kprintf("IOAPIC: warning intsrc irq %d, pola " |
| 295 | "%s -> %s\n", irq, |
| 296 | intr_str_polarity(int_src->int_pola), |
| 297 | intr_str_polarity(pola)); |
| 298 | } |
| 299 | } |
| 300 | int_src->int_gsi = gsi; |
| 301 | int_src->int_trig = trig; |
| 302 | int_src->int_pola = pola; |
| 303 | } |
| 304 | |
| 305 | static void |
| 306 | ioapic_set_apic_id(const struct ioapic_info *info) |
| 307 | { |
| 308 | uint32_t id; |
| 309 | int apic_id; |
| 310 | |
| 311 | id = ioapic_read(info->io_addr, IOAPIC_ID); |
| 312 | |
| 313 | id &= ~APIC_ID_MASK; |
| 314 | id |= (info->io_apic_id << 24); |
| 315 | |
| 316 | ioapic_write(info->io_addr, IOAPIC_ID, id); |
| 317 | |
| 318 | /* |
| 319 | * Re-read && test |
| 320 | */ |
| 321 | id = ioapic_read(info->io_addr, IOAPIC_ID); |
| 322 | apic_id = (id & APIC_ID_MASK) >> 24; |
| 323 | |
| 324 | /* |
| 325 | * I/O APIC ID is a 4bits field |
| 326 | */ |
| 327 | if ((apic_id & IOAPIC_ID_MASK) != |
| 328 | (info->io_apic_id & IOAPIC_ID_MASK)) { |
| 329 | panic("ioapic_set_apic_id: can't set apic id to %d, " |
| 330 | "currently set to %d\n", info->io_apic_id, apic_id); |
| 331 | } |
| 332 | } |
| 333 | |
| 334 | static void |
| 335 | ioapic_gsi_setup(int gsi) |
| 336 | { |
| 337 | enum intr_trigger trig; |
| 338 | enum intr_polarity pola; |
| 339 | int irq; |
| 340 | |
| 341 | if (gsi == 0) { |
| 342 | /* ExtINT */ |
| 343 | imen_lock(); |
| 344 | ioapic_extpin_setup(ioapic_gsi_ioaddr(gsi), |
| 345 | ioapic_gsi_pin(gsi), 0); |
| 346 | imen_unlock(); |
| 347 | return; |
| 348 | } |
| 349 | |
| 350 | for (irq = 0; irq < ISA_IRQ_CNT; ++irq) { |
| 351 | const struct ioapic_intsrc *int_src = |
| 352 | &ioapic_conf.ioc_intsrc[irq]; |
| 353 | |
| 354 | if (gsi == int_src->int_gsi) { |
| 355 | trig = int_src->int_trig; |
| 356 | pola = int_src->int_pola; |
| 357 | break; |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | if (irq == ISA_IRQ_CNT) { |
| 362 | /* |
| 363 | * No explicit IRQ to GSI mapping; |
| 364 | * use the default 1:1 mapping |
| 365 | */ |
| 366 | irq = gsi; |
| 367 | if (irq < ISA_IRQ_CNT) { |
| 368 | if (ioapic_conf.ioc_intsrc[irq].int_gsi >= 0) { |
| 369 | /* |
| 370 | * This IRQ is mapped to different GSI, |
| 371 | * don't do the default configuration. |
| 372 | * The configuration of the target GSI |
| 373 | * will finally setup this IRQ. |
| 374 | * |
| 375 | * This GSI is not used, disable it. |
| 376 | */ |
| 377 | imen_lock(); |
| 378 | ioapic_pin_setup(ioapic_gsi_ioaddr(gsi), |
| 379 | ioapic_gsi_pin(gsi), 0, |
| 380 | INTR_TRIGGER_EDGE, INTR_POLARITY_HIGH, 0); |
| 381 | imen_unlock(); |
| 382 | return; |
| 383 | } |
| 384 | trig = INTR_TRIGGER_EDGE; |
| 385 | pola = INTR_POLARITY_HIGH; |
| 386 | } else { |
| 387 | trig = INTR_TRIGGER_LEVEL; |
| 388 | pola = INTR_POLARITY_LOW; |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | ioapic_abi_set_irqmap(irq, gsi, trig, pola); |
| 393 | } |
| 394 | |
| 395 | void * |
| 396 | ioapic_gsi_ioaddr(int gsi) |
| 397 | { |
| 398 | const struct ioapic_info *info; |
| 399 | |
| 400 | info = ioapic_gsi_search(gsi); |
| 401 | return info->io_addr; |
| 402 | } |
| 403 | |
| 404 | int |
| 405 | ioapic_gsi_pin(int gsi) |
| 406 | { |
| 407 | const struct ioapic_info *info; |
| 408 | |
| 409 | info = ioapic_gsi_search(gsi); |
| 410 | return gsi - info->io_gsi_base; |
| 411 | } |
| 412 | |
| 413 | static const struct ioapic_info * |
| 414 | ioapic_gsi_search(int gsi) |
| 415 | { |
| 416 | const struct ioapic_info *info; |
| 417 | |
| 418 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { |
| 419 | if (gsi >= info->io_gsi_base && |
| 420 | gsi < info->io_gsi_base + info->io_npin) |
| 421 | return info; |
| 422 | } |
| 423 | panic("ioapic_gsi_search: no I/O APIC\n"); |
| 424 | } |
| 425 | |
| 426 | int |
| 427 | ioapic_gsi(int idx, int pin) |
| 428 | { |
| 429 | const struct ioapic_info *info; |
| 430 | |
| 431 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { |
| 432 | if (info->io_idx == idx) |
| 433 | break; |
| 434 | } |
| 435 | if (info == NULL) |
| 436 | return -1; |
| 437 | if (pin >= info->io_npin) |
| 438 | return -1; |
| 439 | return info->io_gsi_base + pin; |
| 440 | } |
| 441 | |
| 442 | void |
| 443 | ioapic_extpin_setup(void *addr, int pin, int vec) |
| 444 | { |
| 445 | ioapic_pin_prog(addr, pin, vec, |
| 446 | INTR_TRIGGER_CONFORM, INTR_POLARITY_CONFORM, IOART_DELEXINT, 0); |
| 447 | } |
| 448 | |
| 449 | int |
| 450 | ioapic_extpin_gsi(void) |
| 451 | { |
| 452 | return 0; |
| 453 | } |
| 454 | |
| 455 | void |
| 456 | ioapic_pin_setup(void *addr, int pin, int vec, |
| 457 | enum intr_trigger trig, enum intr_polarity pola, int cpuid) |
| 458 | { |
| 459 | /* |
| 460 | * Always clear an I/O APIC pin before [re]programming it. This is |
| 461 | * particularly important if the pin is set up for a level interrupt |
| 462 | * as the IOART_REM_IRR bit might be set. When we reprogram the |
| 463 | * vector any EOI from pending ints on this pin could be lost and |
| 464 | * IRR might never get reset. |
| 465 | * |
| 466 | * To fix this problem, clear the vector and make sure it is |
| 467 | * programmed as an edge interrupt. This should theoretically |
| 468 | * clear IRR so we can later, safely program it as a level |
| 469 | * interrupt. |
| 470 | */ |
| 471 | ioapic_pin_prog(addr, pin, vec, INTR_TRIGGER_EDGE, INTR_POLARITY_HIGH, |
| 472 | IOART_DELFIXED, cpuid); |
| 473 | ioapic_pin_prog(addr, pin, vec, trig, pola, IOART_DELFIXED, cpuid); |
| 474 | } |
| 475 | |
| 476 | static void |
| 477 | ioapic_pin_prog(void *addr, int pin, int vec, |
| 478 | enum intr_trigger trig, enum intr_polarity pola, |
| 479 | uint32_t del_mode, int cpuid) |
| 480 | { |
| 481 | uint32_t flags, target; |
| 482 | int select; |
| 483 | |
| 484 | KKASSERT(del_mode == IOART_DELEXINT || del_mode == IOART_DELFIXED); |
| 485 | |
| 486 | select = IOAPIC_REDTBL0 + (2 * pin); |
| 487 | |
| 488 | flags = ioapic_read(addr, select) & IOART_RESV; |
| 489 | flags |= IOART_INTMSET | IOART_DESTPHY; |
| 490 | #ifdef foo |
| 491 | flags |= del_mode; |
| 492 | #else |
| 493 | /* |
| 494 | * We only support limited I/O APIC mixed mode, |
| 495 | * so even for ExtINT, we still use "fixed" |
| 496 | * delivery mode. |
| 497 | */ |
| 498 | flags |= IOART_DELFIXED; |
| 499 | #endif |
| 500 | |
| 501 | if (del_mode == IOART_DELEXINT) { |
| 502 | KKASSERT(trig == INTR_TRIGGER_CONFORM && |
| 503 | pola == INTR_POLARITY_CONFORM); |
| 504 | flags |= IOART_TRGREDG | IOART_INTAHI; |
| 505 | } else { |
| 506 | switch (trig) { |
| 507 | case INTR_TRIGGER_EDGE: |
| 508 | flags |= IOART_TRGREDG; |
| 509 | break; |
| 510 | |
| 511 | case INTR_TRIGGER_LEVEL: |
| 512 | flags |= IOART_TRGRLVL; |
| 513 | break; |
| 514 | |
| 515 | case INTR_TRIGGER_CONFORM: |
| 516 | panic("ioapic_pin_prog: trig conform is not " |
| 517 | "supported\n"); |
| 518 | } |
| 519 | switch (pola) { |
| 520 | case INTR_POLARITY_HIGH: |
| 521 | flags |= IOART_INTAHI; |
| 522 | break; |
| 523 | |
| 524 | case INTR_POLARITY_LOW: |
| 525 | flags |= IOART_INTALO; |
| 526 | break; |
| 527 | |
| 528 | case INTR_POLARITY_CONFORM: |
| 529 | panic("ioapic_pin_prog: pola conform is not " |
| 530 | "supported\n"); |
| 531 | } |
| 532 | } |
| 533 | |
| 534 | target = ioapic_read(addr, select + 1) & IOART_HI_DEST_RESV; |
| 535 | target |= (CPUID_TO_APICID(cpuid) << IOART_HI_DEST_SHIFT) & |
| 536 | IOART_HI_DEST_MASK; |
| 537 | |
| 538 | ioapic_write(addr, select, flags | vec); |
| 539 | ioapic_write(addr, select + 1, target); |
| 540 | } |
| 541 | |
| 542 | static void |
| 543 | ioapic_setup(const struct ioapic_info *info) |
| 544 | { |
| 545 | int i; |
| 546 | |
| 547 | ioapic_set_apic_id(info); |
| 548 | |
| 549 | for (i = 0; i < info->io_npin; ++i) |
| 550 | ioapic_gsi_setup(info->io_gsi_base + i); |
| 551 | } |
| 552 | |
| 553 | static int |
| 554 | ioapic_alloc_apic_id(int start) |
| 555 | { |
| 556 | for (;;) { |
| 557 | const struct ioapic_info *info; |
| 558 | int apic_id, apic_id16; |
| 559 | |
| 560 | apic_id = lapic_unused_apic_id(start); |
| 561 | if (apic_id == NAPICID) { |
| 562 | kprintf("IOAPIC: can't find unused APIC ID\n"); |
| 563 | return apic_id; |
| 564 | } |
| 565 | apic_id16 = apic_id & IOAPIC_ID_MASK; |
| 566 | |
| 567 | /* |
| 568 | * Check against other I/O APIC's APIC ID's lower 4bits. |
| 569 | * |
| 570 | * The new APIC ID will have to be different from others |
| 571 | * in the lower 4bits, no matter whether xAPIC is used |
| 572 | * or not. |
| 573 | */ |
| 574 | TAILQ_FOREACH(info, &ioapic_conf.ioc_list, io_link) { |
| 575 | if (info->io_apic_id == -1) { |
| 576 | info = NULL; |
| 577 | break; |
| 578 | } |
| 579 | if ((info->io_apic_id & IOAPIC_ID_MASK) == apic_id16) |
| 580 | break; |
| 581 | } |
| 582 | if (info == NULL) |
| 583 | return apic_id; |
| 584 | |
| 585 | kprintf("IOAPIC: APIC ID %d has same lower 4bits as " |
| 586 | "%dth I/O APIC, keep searching...\n", |
| 587 | apic_id, info->io_idx); |
| 588 | |
| 589 | start = apic_id + 1; |
| 590 | } |
| 591 | panic("ioapic_unused_apic_id: never reached\n"); |
| 592 | } |
| 593 | |
| 594 | /* |
| 595 | * Map a physical memory address representing I/O into KVA. The I/O |
| 596 | * block is assumed not to cross a page boundary. |
| 597 | */ |
| 598 | void * |
| 599 | ioapic_map(vm_paddr_t pa) |
| 600 | { |
| 601 | KKASSERT(pa < 0x100000000LL); |
| 602 | |
| 603 | return pmap_mapdev_uncacheable(pa, PAGE_SIZE); |
| 604 | } |
| 605 | |
| 606 | static void |
| 607 | ioapic_sysinit(void *dummy __unused) |
| 608 | { |
| 609 | int error; |
| 610 | |
| 611 | if (!ioapic_enable) |
| 612 | return; |
| 613 | |
| 614 | KASSERT(lapic_enable, ("I/O APIC is enabled, but LAPIC is disabled\n")); |
| 615 | error = ioapic_config(); |
| 616 | if (error) { |
| 617 | ioapic_enable = 0; |
| 618 | icu_reinit_noioapic(); |
| 619 | lapic_fixup_noioapic(); |
| 620 | } |
| 621 | } |
| 622 | SYSINIT(ioapic, SI_BOOT2_IOAPIC, SI_ORDER_FIRST, ioapic_sysinit, NULL) |