1 /*- 2 * Copyright 1998 Massachusetts Institute of Technology 3 * 4 * Permission to use, copy, modify, and distribute this software and 5 * its documentation for any purpose and without fee is hereby 6 * granted, provided that both the above copyright notice and this 7 * permission notice appear in all copies, that both the above 8 * copyright notice and this permission notice appear in all 9 * supporting documentation, and that the name of M.I.T. not be used 10 * in advertising or publicity pertaining to distribution of the 11 * software without specific, written prior permission. M.I.T. makes 12 * no representations about the suitability of this software for any 13 * purpose. It is provided "as is" without express or implied 14 * warranty. 15 * 16 * THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS 17 * ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE, 18 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT 20 * SHALL M.I.T. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 21 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 22 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 23 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 24 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 25 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 26 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #include <sys/cdefs.h> 31 __FBSDID("$FreeBSD$"); 32 33 /* 34 * This code implements a `root nexus' for Intel Architecture 35 * machines. The function of the root nexus is to serve as an 36 * attachment point for both processors and buses, and to manage 37 * resources which are common to all of them. In particular, 38 * this code implements the core resource managers for interrupt 39 * requests, DMA requests (which rightfully should be a part of the 40 * ISA code but it's easier to do it here for now), I/O port addresses, 41 * and I/O memory address space. 42 */ 43 44 #ifdef __amd64__ 45 #define DEV_APIC 46 #else 47 #include "opt_apic.h" 48 #endif 49 #include "opt_isa.h" 50 51 #include <sys/param.h> 52 #include <sys/systm.h> 53 #include <sys/bus.h> 54 #include <sys/kernel.h> 55 #include <sys/linker.h> 56 #include <sys/malloc.h> 57 #include <sys/module.h> 58 #include <machine/bus.h> 59 #include <machine/intr_machdep.h> 60 #include <sys/rman.h> 61 #include <sys/interrupt.h> 62 63 #include <machine/vmparam.h> 64 #include <vm/vm.h> 65 #include <vm/pmap.h> 66 #include <machine/pmap.h> 67 68 #include <machine/metadata.h> 69 #include <machine/nexusvar.h> 70 #include <machine/resource.h> 71 #include <machine/pc/bios.h> 72 73 #ifdef DEV_APIC 74 #include "pcib_if.h" 75 #endif 76 77 #ifdef DEV_ISA 78 #include <isa/isavar.h> 79 #ifdef PC98 80 #include <pc98/cbus/cbus.h> 81 #else 82 #include <isa/isareg.h> 83 #endif 84 #endif 85 #include <sys/rtprio.h> 86 87 #define ELF_KERN_STR ("elf"__XSTRING(__ELF_WORD_SIZE)" kernel") 88 89 static MALLOC_DEFINE(M_NEXUSDEV, "nexusdev", "Nexus device"); 90 91 #define DEVTONX(dev) ((struct nexus_device *)device_get_ivars(dev)) 92 93 struct rman irq_rman, drq_rman, port_rman, mem_rman; 94 95 static int nexus_probe(device_t); 96 static int nexus_attach(device_t); 97 static int nexus_print_all_resources(device_t dev); 98 static int nexus_print_child(device_t, device_t); 99 static device_t nexus_add_child(device_t bus, u_int order, const char *name, 100 int unit); 101 static struct resource *nexus_alloc_resource(device_t, device_t, int, int *, 102 u_long, u_long, u_long, u_int); 103 static int nexus_adjust_resource(device_t, device_t, int, struct resource *, 104 u_long, u_long); 105 #ifdef SMP 106 static int nexus_bind_intr(device_t, device_t, struct resource *, int); 107 #endif 108 static int nexus_config_intr(device_t, int, enum intr_trigger, 109 enum intr_polarity); 110 static int nexus_describe_intr(device_t dev, device_t child, 111 struct resource *irq, void *cookie, 112 const char *descr); 113 static int nexus_activate_resource(device_t, device_t, int, int, 114 struct resource *); 115 static int nexus_deactivate_resource(device_t, device_t, int, int, 116 struct resource *); 117 static int nexus_release_resource(device_t, device_t, int, int, 118 struct resource *); 119 static int nexus_setup_intr(device_t, device_t, struct resource *, int flags, 120 driver_filter_t filter, void (*)(void *), void *, 121 void **); 122 static int nexus_teardown_intr(device_t, device_t, struct resource *, 123 void *); 124 static struct resource_list *nexus_get_reslist(device_t dev, device_t child); 125 static int nexus_set_resource(device_t, device_t, int, int, u_long, u_long); 126 static int nexus_get_resource(device_t, device_t, int, int, u_long *, u_long *); 127 static void nexus_delete_resource(device_t, device_t, int, int); 128 #ifdef DEV_APIC 129 static int nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs); 130 static int nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs); 131 static int nexus_alloc_msix(device_t pcib, device_t dev, int *irq); 132 static int nexus_release_msix(device_t pcib, device_t dev, int irq); 133 static int nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data); 134 #endif 135 136 static device_method_t nexus_methods[] = { 137 /* Device interface */ 138 DEVMETHOD(device_probe, nexus_probe), 139 DEVMETHOD(device_attach, nexus_attach), 140 DEVMETHOD(device_detach, bus_generic_detach), 141 DEVMETHOD(device_shutdown, bus_generic_shutdown), 142 DEVMETHOD(device_suspend, bus_generic_suspend), 143 DEVMETHOD(device_resume, bus_generic_resume), 144 145 /* Bus interface */ 146 DEVMETHOD(bus_print_child, nexus_print_child), 147 DEVMETHOD(bus_add_child, nexus_add_child), 148 DEVMETHOD(bus_alloc_resource, nexus_alloc_resource), 149 DEVMETHOD(bus_adjust_resource, nexus_adjust_resource), 150 DEVMETHOD(bus_release_resource, nexus_release_resource), 151 DEVMETHOD(bus_activate_resource, nexus_activate_resource), 152 DEVMETHOD(bus_deactivate_resource, nexus_deactivate_resource), 153 DEVMETHOD(bus_setup_intr, nexus_setup_intr), 154 DEVMETHOD(bus_teardown_intr, nexus_teardown_intr), 155 #ifdef SMP 156 DEVMETHOD(bus_bind_intr, nexus_bind_intr), 157 #endif 158 DEVMETHOD(bus_config_intr, nexus_config_intr), 159 DEVMETHOD(bus_describe_intr, nexus_describe_intr), 160 DEVMETHOD(bus_get_resource_list, nexus_get_reslist), 161 DEVMETHOD(bus_set_resource, nexus_set_resource), 162 DEVMETHOD(bus_get_resource, nexus_get_resource), 163 DEVMETHOD(bus_delete_resource, nexus_delete_resource), 164 165 /* pcib interface */ 166 #ifdef DEV_APIC 167 DEVMETHOD(pcib_alloc_msi, nexus_alloc_msi), 168 DEVMETHOD(pcib_release_msi, nexus_release_msi), 169 DEVMETHOD(pcib_alloc_msix, nexus_alloc_msix), 170 DEVMETHOD(pcib_release_msix, nexus_release_msix), 171 DEVMETHOD(pcib_map_msi, nexus_map_msi), 172 #endif 173 174 { 0, 0 } 175 }; 176 177 DEFINE_CLASS_0(nexus, nexus_driver, nexus_methods, 1); 178 static devclass_t nexus_devclass; 179 180 DRIVER_MODULE(nexus, root, nexus_driver, nexus_devclass, 0, 0); 181 182 static int 183 nexus_probe(device_t dev) 184 { 185 186 device_quiet(dev); /* suppress attach message for neatness */ 187 return (BUS_PROBE_GENERIC); 188 } 189 190 void 191 nexus_init_resources(void) 192 { 193 int irq; 194 195 /* 196 * XXX working notes: 197 * 198 * - IRQ resource creation should be moved to the PIC/APIC driver. 199 * - DRQ resource creation should be moved to the DMAC driver. 200 * - The above should be sorted to probe earlier than any child busses. 201 * 202 * - Leave I/O and memory creation here, as child probes may need them. 203 * (especially eg. ACPI) 204 */ 205 206 /* 207 * IRQ's are on the mainboard on old systems, but on the ISA part 208 * of PCI->ISA bridges. There would be multiple sets of IRQs on 209 * multi-ISA-bus systems. PCI interrupts are routed to the ISA 210 * component, so in a way, PCI can be a partial child of an ISA bus(!). 211 * APIC interrupts are global though. 212 */ 213 irq_rman.rm_start = 0; 214 irq_rman.rm_type = RMAN_ARRAY; 215 irq_rman.rm_descr = "Interrupt request lines"; 216 irq_rman.rm_end = NUM_IO_INTS - 1; 217 if (rman_init(&irq_rman)) 218 panic("nexus_init_resources irq_rman"); 219 220 /* 221 * We search for regions of existing IRQs and add those to the IRQ 222 * resource manager. 223 */ 224 for (irq = 0; irq < NUM_IO_INTS; irq++) 225 if (intr_lookup_source(irq) != NULL) 226 if (rman_manage_region(&irq_rman, irq, irq) != 0) 227 panic("nexus_init_resources irq_rman add"); 228 229 /* 230 * ISA DMA on PCI systems is implemented in the ISA part of each 231 * PCI->ISA bridge and the channels can be duplicated if there are 232 * multiple bridges. (eg: laptops with docking stations) 233 */ 234 drq_rman.rm_start = 0; 235 #ifdef PC98 236 drq_rman.rm_end = 3; 237 #else 238 drq_rman.rm_end = 7; 239 #endif 240 drq_rman.rm_type = RMAN_ARRAY; 241 drq_rman.rm_descr = "DMA request lines"; 242 /* XXX drq 0 not available on some machines */ 243 if (rman_init(&drq_rman) 244 || rman_manage_region(&drq_rman, 245 drq_rman.rm_start, drq_rman.rm_end)) 246 panic("nexus_init_resources drq_rman"); 247 248 /* 249 * However, IO ports and Memory truely are global at this level, 250 * as are APIC interrupts (however many IO APICS there turn out 251 * to be on large systems..) 252 */ 253 port_rman.rm_start = 0; 254 port_rman.rm_end = 0xffff; 255 port_rman.rm_type = RMAN_ARRAY; 256 port_rman.rm_descr = "I/O ports"; 257 if (rman_init(&port_rman) 258 || rman_manage_region(&port_rman, 0, 0xffff)) 259 panic("nexus_init_resources port_rman"); 260 261 mem_rman.rm_start = 0; 262 mem_rman.rm_end = ~0ul; 263 mem_rman.rm_type = RMAN_ARRAY; 264 mem_rman.rm_descr = "I/O memory addresses"; 265 if (rman_init(&mem_rman) 266 || rman_manage_region(&mem_rman, 0, ~0)) 267 panic("nexus_init_resources mem_rman"); 268 } 269 270 static int 271 nexus_attach(device_t dev) 272 { 273 274 nexus_init_resources(); 275 bus_generic_probe(dev); 276 277 /* 278 * Explicitly add the legacy0 device here. Other platform 279 * types (such as ACPI), use their own nexus(4) subclass 280 * driver to override this routine and add their own root bus. 281 */ 282 if (BUS_ADD_CHILD(dev, 10, "legacy", 0) == NULL) 283 panic("legacy: could not attach"); 284 bus_generic_attach(dev); 285 return 0; 286 } 287 288 static int 289 nexus_print_all_resources(device_t dev) 290 { 291 struct nexus_device *ndev = DEVTONX(dev); 292 struct resource_list *rl = &ndev->nx_resources; 293 int retval = 0; 294 295 if (STAILQ_FIRST(rl)) 296 retval += printf(" at"); 297 298 retval += resource_list_print_type(rl, "port", SYS_RES_IOPORT, "%#lx"); 299 retval += resource_list_print_type(rl, "iomem", SYS_RES_MEMORY, "%#lx"); 300 retval += resource_list_print_type(rl, "irq", SYS_RES_IRQ, "%ld"); 301 302 return retval; 303 } 304 305 static int 306 nexus_print_child(device_t bus, device_t child) 307 { 308 int retval = 0; 309 310 retval += bus_print_child_header(bus, child); 311 retval += nexus_print_all_resources(child); 312 if (device_get_flags(child)) 313 retval += printf(" flags %#x", device_get_flags(child)); 314 retval += printf(" on motherboard\n"); /* XXX "motherboard", ick */ 315 316 return (retval); 317 } 318 319 static device_t 320 nexus_add_child(device_t bus, u_int order, const char *name, int unit) 321 { 322 device_t child; 323 struct nexus_device *ndev; 324 325 ndev = malloc(sizeof(struct nexus_device), M_NEXUSDEV, M_NOWAIT|M_ZERO); 326 if (!ndev) 327 return(0); 328 resource_list_init(&ndev->nx_resources); 329 330 child = device_add_child_ordered(bus, order, name, unit); 331 332 /* should we free this in nexus_child_detached? */ 333 device_set_ivars(child, ndev); 334 335 return(child); 336 } 337 338 static struct rman * 339 nexus_rman(int type) 340 { 341 switch (type) { 342 case SYS_RES_IRQ: 343 return (&irq_rman); 344 case SYS_RES_DRQ: 345 return (&drq_rman); 346 case SYS_RES_IOPORT: 347 return (&port_rman); 348 case SYS_RES_MEMORY: 349 return (&mem_rman); 350 default: 351 return (NULL); 352 } 353 } 354 355 /* 356 * Allocate a resource on behalf of child. NB: child is usually going to be a 357 * child of one of our descendants, not a direct child of nexus0. 358 * (Exceptions include npx.) 359 */ 360 static struct resource * 361 nexus_alloc_resource(device_t bus, device_t child, int type, int *rid, 362 u_long start, u_long end, u_long count, u_int flags) 363 { 364 struct nexus_device *ndev = DEVTONX(child); 365 struct resource *rv; 366 struct resource_list_entry *rle; 367 struct rman *rm; 368 int needactivate = flags & RF_ACTIVE; 369 370 /* 371 * If this is an allocation of the "default" range for a given 372 * RID, and we know what the resources for this device are 373 * (ie. they aren't maintained by a child bus), then work out 374 * the start/end values. 375 */ 376 if ((start == 0UL) && (end == ~0UL) && (count == 1)) { 377 if (device_get_parent(child) != bus || ndev == NULL) 378 return(NULL); 379 rle = resource_list_find(&ndev->nx_resources, type, *rid); 380 if (rle == NULL) 381 return(NULL); 382 start = rle->start; 383 end = rle->end; 384 count = rle->count; 385 } 386 387 flags &= ~RF_ACTIVE; 388 rm = nexus_rman(type); 389 if (rm == NULL) 390 return (NULL); 391 392 rv = rman_reserve_resource(rm, start, end, count, flags, child); 393 if (rv == 0) 394 return 0; 395 rman_set_rid(rv, *rid); 396 397 if (needactivate) { 398 if (bus_activate_resource(child, type, *rid, rv)) { 399 rman_release_resource(rv); 400 return 0; 401 } 402 } 403 404 return rv; 405 } 406 407 static int 408 nexus_adjust_resource(device_t bus, device_t child, int type, 409 struct resource *r, u_long start, u_long end) 410 { 411 struct rman *rm; 412 413 rm = nexus_rman(type); 414 if (rm == NULL) 415 return (ENXIO); 416 if (!rman_is_region_manager(r, rm)) 417 return (EINVAL); 418 return (rman_adjust_resource(r, start, end)); 419 } 420 421 static int 422 nexus_activate_resource(device_t bus, device_t child, int type, int rid, 423 struct resource *r) 424 { 425 #ifdef PC98 426 bus_space_handle_t bh; 427 int error; 428 #endif 429 void *vaddr; 430 431 /* 432 * If this is a memory resource, map it into the kernel. 433 */ 434 switch (type) { 435 case SYS_RES_IOPORT: 436 #ifdef PC98 437 error = i386_bus_space_handle_alloc(X86_BUS_SPACE_IO, 438 rman_get_start(r), rman_get_size(r), &bh); 439 if (error) 440 return (error); 441 rman_set_bushandle(r, bh); 442 #else 443 rman_set_bushandle(r, rman_get_start(r)); 444 #endif 445 rman_set_bustag(r, X86_BUS_SPACE_IO); 446 break; 447 case SYS_RES_MEMORY: 448 #ifdef PC98 449 error = i386_bus_space_handle_alloc(X86_BUS_SPACE_MEM, 450 rman_get_start(r), rman_get_size(r), &bh); 451 if (error) 452 return (error); 453 #endif 454 vaddr = pmap_mapdev(rman_get_start(r), rman_get_size(r)); 455 rman_set_virtual(r, vaddr); 456 rman_set_bustag(r, X86_BUS_SPACE_MEM); 457 #ifdef PC98 458 /* PC-98: the type of bus_space_handle_t is the structure. */ 459 bh->bsh_base = (bus_addr_t) vaddr; 460 rman_set_bushandle(r, bh); 461 #else 462 /* IBM-PC: the type of bus_space_handle_t is u_int */ 463 rman_set_bushandle(r, (bus_space_handle_t) vaddr); 464 #endif 465 } 466 return (rman_activate_resource(r)); 467 } 468 469 static int 470 nexus_deactivate_resource(device_t bus, device_t child, int type, int rid, 471 struct resource *r) 472 { 473 474 /* 475 * If this is a memory resource, unmap it. 476 */ 477 if (type == SYS_RES_MEMORY) { 478 pmap_unmapdev((vm_offset_t)rman_get_virtual(r), 479 rman_get_size(r)); 480 } 481 #ifdef PC98 482 if (type == SYS_RES_MEMORY || type == SYS_RES_IOPORT) { 483 bus_space_handle_t bh; 484 485 bh = rman_get_bushandle(r); 486 i386_bus_space_handle_free(rman_get_bustag(r), bh, bh->bsh_sz); 487 } 488 #endif 489 return (rman_deactivate_resource(r)); 490 } 491 492 static int 493 nexus_release_resource(device_t bus, device_t child, int type, int rid, 494 struct resource *r) 495 { 496 497 if (rman_get_flags(r) & RF_ACTIVE) { 498 int error = bus_deactivate_resource(child, type, rid, r); 499 if (error) 500 return error; 501 } 502 return (rman_release_resource(r)); 503 } 504 505 /* 506 * Currently this uses the really grody interface from kern/kern_intr.c 507 * (which really doesn't belong in kern/anything.c). Eventually, all of 508 * the code in kern_intr.c and machdep_intr.c should get moved here, since 509 * this is going to be the official interface. 510 */ 511 static int 512 nexus_setup_intr(device_t bus, device_t child, struct resource *irq, 513 int flags, driver_filter_t filter, void (*ihand)(void *), 514 void *arg, void **cookiep) 515 { 516 int error; 517 518 /* somebody tried to setup an irq that failed to allocate! */ 519 if (irq == NULL) 520 panic("nexus_setup_intr: NULL irq resource!"); 521 522 *cookiep = 0; 523 if ((rman_get_flags(irq) & RF_SHAREABLE) == 0) 524 flags |= INTR_EXCL; 525 526 /* 527 * We depend here on rman_activate_resource() being idempotent. 528 */ 529 error = rman_activate_resource(irq); 530 if (error) 531 return (error); 532 533 error = intr_add_handler(device_get_nameunit(child), 534 rman_get_start(irq), filter, ihand, arg, flags, cookiep); 535 536 return (error); 537 } 538 539 static int 540 nexus_teardown_intr(device_t dev, device_t child, struct resource *r, void *ih) 541 { 542 return (intr_remove_handler(ih)); 543 } 544 545 #ifdef SMP 546 static int 547 nexus_bind_intr(device_t dev, device_t child, struct resource *irq, int cpu) 548 { 549 return (intr_bind(rman_get_start(irq), cpu)); 550 } 551 #endif 552 553 static int 554 nexus_config_intr(device_t dev, int irq, enum intr_trigger trig, 555 enum intr_polarity pol) 556 { 557 return (intr_config_intr(irq, trig, pol)); 558 } 559 560 static int 561 nexus_describe_intr(device_t dev, device_t child, struct resource *irq, 562 void *cookie, const char *descr) 563 { 564 565 return (intr_describe(rman_get_start(irq), cookie, descr)); 566 } 567 568 static struct resource_list * 569 nexus_get_reslist(device_t dev, device_t child) 570 { 571 struct nexus_device *ndev = DEVTONX(child); 572 573 return (&ndev->nx_resources); 574 } 575 576 static int 577 nexus_set_resource(device_t dev, device_t child, int type, int rid, u_long start, u_long count) 578 { 579 struct nexus_device *ndev = DEVTONX(child); 580 struct resource_list *rl = &ndev->nx_resources; 581 582 /* XXX this should return a success/failure indicator */ 583 resource_list_add(rl, type, rid, start, start + count - 1, count); 584 return(0); 585 } 586 587 static int 588 nexus_get_resource(device_t dev, device_t child, int type, int rid, u_long *startp, u_long *countp) 589 { 590 struct nexus_device *ndev = DEVTONX(child); 591 struct resource_list *rl = &ndev->nx_resources; 592 struct resource_list_entry *rle; 593 594 rle = resource_list_find(rl, type, rid); 595 if (!rle) 596 return(ENOENT); 597 if (startp) 598 *startp = rle->start; 599 if (countp) 600 *countp = rle->count; 601 return(0); 602 } 603 604 static void 605 nexus_delete_resource(device_t dev, device_t child, int type, int rid) 606 { 607 struct nexus_device *ndev = DEVTONX(child); 608 struct resource_list *rl = &ndev->nx_resources; 609 610 resource_list_delete(rl, type, rid); 611 } 612 613 /* Called from the MSI code to add new IRQs to the IRQ rman. */ 614 void 615 nexus_add_irq(u_long irq) 616 { 617 618 if (rman_manage_region(&irq_rman, irq, irq) != 0) 619 panic("%s: failed", __func__); 620 } 621 622 #ifdef DEV_APIC 623 static int 624 nexus_alloc_msix(device_t pcib, device_t dev, int *irq) 625 { 626 627 return (msix_alloc(dev, irq)); 628 } 629 630 static int 631 nexus_release_msix(device_t pcib, device_t dev, int irq) 632 { 633 634 return (msix_release(irq)); 635 } 636 637 static int 638 nexus_alloc_msi(device_t pcib, device_t dev, int count, int maxcount, int *irqs) 639 { 640 641 return (msi_alloc(dev, count, maxcount, irqs)); 642 } 643 644 static int 645 nexus_release_msi(device_t pcib, device_t dev, int count, int *irqs) 646 { 647 648 return (msi_release(irqs, count)); 649 } 650 651 static int 652 nexus_map_msi(device_t pcib, device_t dev, int irq, uint64_t *addr, uint32_t *data) 653 { 654 655 return (msi_map(irq, addr, data)); 656 } 657 #endif 658 659 /* Placeholder for system RAM. */ 660 static void 661 ram_identify(driver_t *driver, device_t parent) 662 { 663 664 if (resource_disabled("ram", 0)) 665 return; 666 if (BUS_ADD_CHILD(parent, 0, "ram", 0) == NULL) 667 panic("ram_identify"); 668 } 669 670 static int 671 ram_probe(device_t dev) 672 { 673 674 device_quiet(dev); 675 device_set_desc(dev, "System RAM"); 676 return (0); 677 } 678 679 static int 680 ram_attach(device_t dev) 681 { 682 struct bios_smap *smapbase, *smap, *smapend; 683 struct resource *res; 684 vm_paddr_t *p; 685 caddr_t kmdp; 686 uint32_t smapsize; 687 int error, rid; 688 689 /* Retrieve the system memory map from the loader. */ 690 kmdp = preload_search_by_type("elf kernel"); 691 if (kmdp == NULL) 692 kmdp = preload_search_by_type(ELF_KERN_STR); 693 smapbase = (struct bios_smap *)preload_search_info(kmdp, 694 MODINFO_METADATA | MODINFOMD_SMAP); 695 if (smapbase != NULL) { 696 smapsize = *((u_int32_t *)smapbase - 1); 697 smapend = (struct bios_smap *)((uintptr_t)smapbase + smapsize); 698 699 rid = 0; 700 for (smap = smapbase; smap < smapend; smap++) { 701 if (smap->type != SMAP_TYPE_MEMORY || 702 smap->length == 0) 703 continue; 704 #ifdef __i386__ 705 /* 706 * Resources use long's to track resources, so 707 * we can't include memory regions above 4GB. 708 */ 709 if (smap->base > ~0ul) 710 continue; 711 #endif 712 error = bus_set_resource(dev, SYS_RES_MEMORY, rid, 713 smap->base, smap->length); 714 if (error) 715 panic( 716 "ram_attach: resource %d failed set with %d", 717 rid, error); 718 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 719 0); 720 if (res == NULL) 721 panic("ram_attach: resource %d failed to attach", 722 rid); 723 rid++; 724 } 725 return (0); 726 } 727 728 /* 729 * If the system map is not available, fall back to using 730 * dump_avail[]. We use the dump_avail[] array rather than 731 * phys_avail[] for the memory map as phys_avail[] contains 732 * holes for kernel memory, page 0, the message buffer, and 733 * the dcons buffer. We test the end address in the loop 734 * instead of the start since the start address for the first 735 * segment is 0. 736 */ 737 for (rid = 0, p = dump_avail; p[1] != 0; rid++, p += 2) { 738 #ifdef PAE 739 /* 740 * Resources use long's to track resources, so we can't 741 * include memory regions above 4GB. 742 */ 743 if (p[0] > ~0ul) 744 break; 745 #endif 746 error = bus_set_resource(dev, SYS_RES_MEMORY, rid, p[0], 747 p[1] - p[0]); 748 if (error) 749 panic("ram_attach: resource %d failed set with %d", rid, 750 error); 751 res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid, 0); 752 if (res == NULL) 753 panic("ram_attach: resource %d failed to attach", rid); 754 } 755 return (0); 756 } 757 758 static device_method_t ram_methods[] = { 759 /* Device interface */ 760 DEVMETHOD(device_identify, ram_identify), 761 DEVMETHOD(device_probe, ram_probe), 762 DEVMETHOD(device_attach, ram_attach), 763 { 0, 0 } 764 }; 765 766 static driver_t ram_driver = { 767 "ram", 768 ram_methods, 769 1, /* no softc */ 770 }; 771 772 static devclass_t ram_devclass; 773 774 DRIVER_MODULE(ram, nexus, ram_driver, ram_devclass, 0, 0); 775 776 #ifdef DEV_ISA 777 /* 778 * Placeholder which claims PnP 'devices' which describe system 779 * resources. 780 */ 781 static struct isa_pnp_id sysresource_ids[] = { 782 { 0x010cd041 /* PNP0c01 */, "System Memory" }, 783 { 0x020cd041 /* PNP0c02 */, "System Resource" }, 784 { 0 } 785 }; 786 787 static int 788 sysresource_probe(device_t dev) 789 { 790 int result; 791 792 if ((result = ISA_PNP_PROBE(device_get_parent(dev), dev, sysresource_ids)) <= 0) { 793 device_quiet(dev); 794 } 795 return(result); 796 } 797 798 static int 799 sysresource_attach(device_t dev) 800 { 801 return(0); 802 } 803 804 static device_method_t sysresource_methods[] = { 805 /* Device interface */ 806 DEVMETHOD(device_probe, sysresource_probe), 807 DEVMETHOD(device_attach, sysresource_attach), 808 DEVMETHOD(device_detach, bus_generic_detach), 809 DEVMETHOD(device_shutdown, bus_generic_shutdown), 810 DEVMETHOD(device_suspend, bus_generic_suspend), 811 DEVMETHOD(device_resume, bus_generic_resume), 812 { 0, 0 } 813 }; 814 815 static driver_t sysresource_driver = { 816 "sysresource", 817 sysresource_methods, 818 1, /* no softc */ 819 }; 820 821 static devclass_t sysresource_devclass; 822 823 DRIVER_MODULE(sysresource, isa, sysresource_driver, sysresource_devclass, 0, 0); 824 #endif /* DEV_ISA */ 825