drivers/pnp/resource.c

   1 /*
   2  * resource.c - Contains functions for registering and analyzing resource information
   3  *
   4  * based on isapnp.c resource management (c) Jaroslav Kysela <perex@perex.cz>
   5  * Copyright 2003 Adam Belay <ambx1@neo.rr.com>
   6  * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
   7  *      Bjorn Helgaas <bjorn.helgaas@hp.com>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/slab.h>
  12 #include <linux/errno.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/kernel.h>
  15 #include <asm/io.h>
  16 #include <asm/dma.h>
  17 #include <asm/irq.h>
  18 #include <linux/pci.h>
  19 #include <linux/ioport.h>
  20 #include <linux/init.h>
  21
  22 #include <linux/pnp.h>
  23 #include "base.h"
  24
  25 static int pnp_reserve_irq[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some IRQ */
  26 static int pnp_reserve_dma[8] = {[0 ... 7] = -1 };      /* reserve (don't use) some DMA */
  27 static int pnp_reserve_io[16] = {[0 ... 15] = -1 };     /* reserve (don't use) some I/O region */
  28 static int pnp_reserve_mem[16] = {[0 ... 15] = -1 };    /* reserve (don't use) some memory region */
  29
  30 /*
  31  * option registration
  32  */
  33
  34 struct pnp_option *pnp_build_option(struct pnp_dev *dev, unsigned long type,
  35                                     unsigned int option_flags)
  36 {
  37         struct pnp_option *option;
  38
  39         option = kzalloc(sizeof(struct pnp_option), GFP_KERNEL);
  40         if (!option)
  41                 return NULL;
  42
  43         option->flags = option_flags;
  44         option->type = type;
  45
  46         list_add_tail(&option->list, &dev->options);
  47         return option;
  48 }
  49
  50 int pnp_register_irq_resource(struct pnp_dev *dev, unsigned int option_flags,
  51                               pnp_irq_mask_t *map, unsigned char flags)
  52 {
  53         struct pnp_option *option;
  54         struct pnp_irq *irq;
  55
  56         option = pnp_build_option(dev, IORESOURCE_IRQ, option_flags);
  57         if (!option)
  58                 return -ENOMEM;
  59
  60         irq = &option->u.irq;
  61         irq->map = *map;
  62         irq->flags = flags;
  63
  64 #ifdef CONFIG_PCI
  65         {
  66                 int i;
  67
  68                 for (i = 0; i < 16; i++)
  69                         if (test_bit(i, irq->map.bits))
  70                                 pcibios_penalize_isa_irq(i, 0);
  71         }
  72 #endif
  73
  74         dbg_pnp_show_option(dev, option);
  75         return 0;
  76 }
  77
  78 int pnp_register_dma_resource(struct pnp_dev *dev, unsigned int option_flags,
  79                               unsigned char map, unsigned char flags)
  80 {
  81         struct pnp_option *option;
  82         struct pnp_dma *dma;
  83
  84         option = pnp_build_option(dev, IORESOURCE_DMA, option_flags);
  85         if (!option)
  86                 return -ENOMEM;
  87
  88         dma = &option->u.dma;
  89         dma->map = map;
  90         dma->flags = flags;
  91
  92         dbg_pnp_show_option(dev, option);
  93         return 0;
  94 }
  95
  96 int pnp_register_port_resource(struct pnp_dev *dev, unsigned int option_flags,
  97                                resource_size_t min, resource_size_t max,
  98                                resource_size_t align, resource_size_t size,
  99                                unsigned char flags)
 100 {
 101         struct pnp_option *option;
 102         struct pnp_port *port;
 103
 104         option = pnp_build_option(dev, IORESOURCE_IO, option_flags);
 105         if (!option)
 106                 return -ENOMEM;
 107
 108         port = &option->u.port;
 109         port->min = min;
 110         port->max = max;
 111         port->align = align;
 112         port->size = size;
 113         port->flags = flags;
 114
 115         dbg_pnp_show_option(dev, option);
 116         return 0;
 117 }
 118
 119 int pnp_register_mem_resource(struct pnp_dev *dev, unsigned int option_flags,
 120                               resource_size_t min, resource_size_t max,
 121                               resource_size_t align, resource_size_t size,
 122                               unsigned char flags)
 123 {
 124         struct pnp_option *option;
 125         struct pnp_mem *mem;
 126
 127         option = pnp_build_option(dev, IORESOURCE_MEM, option_flags);
 128         if (!option)
 129                 return -ENOMEM;
 130
 131         mem = &option->u.mem;
 132         mem->min = min;
 133         mem->max = max;
 134         mem->align = align;
 135         mem->size = size;
 136         mem->flags = flags;
 137
 138         dbg_pnp_show_option(dev, option);
 139         return 0;
 140 }
 141
 142 void pnp_free_options(struct pnp_dev *dev)
 143 {
 144         struct pnp_option *option, *tmp;
 145
 146         list_for_each_entry_safe(option, tmp, &dev->options, list) {
 147                 list_del(&option->list);
 148                 kfree(option);
 149         }
 150 }
 151
 152 /*
 153  * resource validity checking
 154  */
 155
 156 #define length(start, end) (*(end) - *(start) + 1)
 157
 158 /* Two ranges conflict if one doesn't end before the other starts */
 159 #define ranged_conflict(starta, enda, startb, endb) \
 160         !((*(enda) < *(startb)) || (*(endb) < *(starta)))
 161
 162 #define cannot_compare(flags) \
 163 ((flags) & IORESOURCE_DISABLED)
 164
 165 int pnp_check_port(struct pnp_dev *dev, struct resource *res)
 166 {
 167         int i;
 168         struct pnp_dev *tdev;
 169         struct resource *tres;
 170         resource_size_t *port, *end, *tport, *tend;
 171
 172         port = &res->start;
 173         end = &res->end;
 174
 175         /* if the resource doesn't exist, don't complain about it */
 176         if (cannot_compare(res->flags))
 177                 return 1;
 178
 179         /* check if the resource is already in use, skip if the
 180          * device is active because it itself may be in use */
 181         if (!dev->active) {
 182                 if (__check_region(&ioport_resource, *port, length(port, end)))
 183                         return 0;
 184         }
 185
 186         /* check if the resource is reserved */
 187         for (i = 0; i < 8; i++) {
 188                 int rport = pnp_reserve_io[i << 1];
 189                 int rend = pnp_reserve_io[(i << 1) + 1] + rport - 1;
 190                 if (ranged_conflict(port, end, &rport, &rend))
 191                         return 0;
 192         }
 193
 194         /* check for internal conflicts */
 195         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IO, i)); i++) {
 196                 if (tres != res && tres->flags & IORESOURCE_IO) {
 197                         tport = &tres->start;
 198                         tend = &tres->end;
 199                         if (ranged_conflict(port, end, tport, tend))
 200                                 return 0;
 201                 }
 202         }
 203
 204         /* check for conflicts with other pnp devices */
 205         pnp_for_each_dev(tdev) {
 206                 if (tdev == dev)
 207                         continue;
 208                 for (i = 0;
 209                      (tres = pnp_get_resource(tdev, IORESOURCE_IO, i));
 210                      i++) {
 211                         if (tres->flags & IORESOURCE_IO) {
 212                                 if (cannot_compare(tres->flags))
 213                                         continue;
 214                                 if (tres->flags & IORESOURCE_WINDOW)
 215                                         continue;
 216                                 tport = &tres->start;
 217                                 tend = &tres->end;
 218                                 if (ranged_conflict(port, end, tport, tend))
 219                                         return 0;
 220                         }
 221                 }
 222         }
 223
 224         return 1;
 225 }
 226
 227 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
 228 {
 229         int i;
 230         struct pnp_dev *tdev;
 231         struct resource *tres;
 232         resource_size_t *addr, *end, *taddr, *tend;
 233
 234         addr = &res->start;
 235         end = &res->end;
 236
 237         /* if the resource doesn't exist, don't complain about it */
 238         if (cannot_compare(res->flags))
 239                 return 1;
 240
 241         /* check if the resource is already in use, skip if the
 242          * device is active because it itself may be in use */
 243         if (!dev->active) {
 244                 if (check_mem_region(*addr, length(addr, end)))
 245                         return 0;
 246         }
 247
 248         /* check if the resource is reserved */
 249         for (i = 0; i < 8; i++) {
 250                 int raddr = pnp_reserve_mem[i << 1];
 251                 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
 252                 if (ranged_conflict(addr, end, &raddr, &rend))
 253                         return 0;
 254         }
 255
 256         /* check for internal conflicts */
 257         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
 258                 if (tres != res && tres->flags & IORESOURCE_MEM) {
 259                         taddr = &tres->start;
 260                         tend = &tres->end;
 261                         if (ranged_conflict(addr, end, taddr, tend))
 262                                 return 0;
 263                 }
 264         }
 265
 266         /* check for conflicts with other pnp devices */
 267         pnp_for_each_dev(tdev) {
 268                 if (tdev == dev)
 269                         continue;
 270                 for (i = 0;
 271                      (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
 272                      i++) {
 273                         if (tres->flags & IORESOURCE_MEM) {
 274                                 if (cannot_compare(tres->flags))
 275                                         continue;
 276                                 if (tres->flags & IORESOURCE_WINDOW)
 277                                         continue;
 278                                 taddr = &tres->start;
 279                                 tend = &tres->end;
 280                                 if (ranged_conflict(addr, end, taddr, tend))
 281                                         return 0;
 282                         }
 283                 }
 284         }
 285
 286         return 1;
 287 }
 288
 289 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
 290 {
 291         return IRQ_HANDLED;
 292 }
 293
 294 #ifdef CONFIG_PCI
 295 static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,
 296                             unsigned int irq)
 297 {
 298         u32 class;
 299         u8 progif;
 300
 301         if (pci->irq == irq) {
 302                 pnp_dbg(&pnp->dev, "  device %s using irq %d\n",
 303                         pci_name(pci), irq);
 304                 return 1;
 305         }
 306
 307         /*
 308          * See pci_setup_device() and ata_pci_sff_activate_host() for
 309          * similar IDE legacy detection.
 310          */
 311         pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
 312         class >>= 8;            /* discard revision ID */
 313         progif = class & 0xff;
 314         class >>= 8;
 315
 316         if (class == PCI_CLASS_STORAGE_IDE) {
 317                 /*
 318                  * Unless both channels are native-PCI mode only,
 319                  * treat the compatibility IRQs as busy.
 320                  */
 321                 if ((progif & 0x5) != 0x5)
 322                         if (pci_get_legacy_ide_irq(pci, 0) == irq ||
 323                             pci_get_legacy_ide_irq(pci, 1) == irq) {
 324                                 pnp_dbg(&pnp->dev, "  legacy IDE device %s "
 325                                         "using irq %d\n", pci_name(pci), irq);
 326                                 return 1;
 327                         }
 328         }
 329
 330         return 0;
 331 }
 332 #endif
 333
 334 static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
 335 {
 336 #ifdef CONFIG_PCI
 337         struct pci_dev *pci = NULL;
 338
 339         for_each_pci_dev(pci) {
 340                 if (pci_dev_uses_irq(pnp, pci, irq)) {
 341                         pci_dev_put(pci);
 342                         return 1;
 343                 }
 344         }
 345 #endif
 346         return 0;
 347 }
 348
 349 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
 350 {
 351         int i;
 352         struct pnp_dev *tdev;
 353         struct resource *tres;
 354         resource_size_t *irq;
 355
 356         irq = &res->start;
 357
 358         /* if the resource doesn't exist, don't complain about it */
 359         if (cannot_compare(res->flags))
 360                 return 1;
 361
 362         /* check if the resource is valid */
 363         if (*irq < 0 || *irq > 15)
 364                 return 0;
 365
 366         /* check if the resource is reserved */
 367         for (i = 0; i < 16; i++) {
 368                 if (pnp_reserve_irq[i] == *irq)
 369                         return 0;
 370         }
 371
 372         /* check for internal conflicts */
 373         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
 374                 if (tres != res && tres->flags & IORESOURCE_IRQ) {
 375                         if (tres->start == *irq)
 376                                 return 0;
 377                 }
 378         }
 379
 380         /* check if the resource is being used by a pci device */
 381         if (pci_uses_irq(dev, *irq))
 382                 return 0;
 383
 384         /* check if the resource is already in use, skip if the
 385          * device is active because it itself may be in use */
 386         if (!dev->active) {
 387                 if (request_irq(*irq, pnp_test_handler,
 388                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 389                         return 0;
 390                 free_irq(*irq, NULL);
 391         }
 392
 393         /* check for conflicts with other pnp devices */
 394         pnp_for_each_dev(tdev) {
 395                 if (tdev == dev)
 396                         continue;
 397                 for (i = 0;
 398                      (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
 399                      i++) {
 400                         if (tres->flags & IORESOURCE_IRQ) {
 401                                 if (cannot_compare(tres->flags))
 402                                         continue;
 403                                 if (tres->start == *irq)
 404                                         return 0;
 405                         }
 406                 }
 407         }
 408
 409         return 1;
 410 }
 411
 412 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
 413 {
 414 #ifndef CONFIG_IA64
 415         int i;
 416         struct pnp_dev *tdev;
 417         struct resource *tres;
 418         resource_size_t *dma;
 419
 420         dma = &res->start;
 421
 422         /* if the resource doesn't exist, don't complain about it */
 423         if (cannot_compare(res->flags))
 424                 return 1;
 425
 426         /* check if the resource is valid */
 427         if (*dma < 0 || *dma == 4 || *dma > 7)
 428                 return 0;
 429
 430         /* check if the resource is reserved */
 431         for (i = 0; i < 8; i++) {
 432                 if (pnp_reserve_dma[i] == *dma)
 433                         return 0;
 434         }
 435
 436         /* check for internal conflicts */
 437         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
 438                 if (tres != res && tres->flags & IORESOURCE_DMA) {
 439                         if (tres->start == *dma)
 440                                 return 0;
 441                 }
 442         }
 443
 444         /* check if the resource is already in use, skip if the
 445          * device is active because it itself may be in use */
 446         if (!dev->active) {
 447                 if (request_dma(*dma, "pnp"))
 448                         return 0;
 449                 free_dma(*dma);
 450         }
 451
 452         /* check for conflicts with other pnp devices */
 453         pnp_for_each_dev(tdev) {
 454                 if (tdev == dev)
 455                         continue;
 456                 for (i = 0;
 457                      (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
 458                      i++) {
 459                         if (tres->flags & IORESOURCE_DMA) {
 460                                 if (cannot_compare(tres->flags))
 461                                         continue;
 462                                 if (tres->start == *dma)
 463                                         return 0;
 464                         }
 465                 }
 466         }
 467
 468         return 1;
 469 #else
 470         /* IA64 does not have legacy DMA */
 471         return 0;
 472 #endif
 473 }
 474
 475 unsigned long pnp_resource_type(struct resource *res)
 476 {
 477         return res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
 478                              IORESOURCE_IRQ | IORESOURCE_DMA |
 479                              IORESOURCE_BUS);
 480 }
 481
 482 struct resource *pnp_get_resource(struct pnp_dev *dev,
 483                                   unsigned long type, unsigned int num)
 484 {
 485         struct pnp_resource *pnp_res;
 486         struct resource *res;
 487
 488         list_for_each_entry(pnp_res, &dev->resources, list) {
 489                 res = &pnp_res->res;
 490                 if (pnp_resource_type(res) == type && num-- == 0)
 491                         return res;
 492         }
 493         return NULL;
 494 }
 495 EXPORT_SYMBOL(pnp_get_resource);
 496
 497 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
 498 {
 499         struct pnp_resource *pnp_res;
 500
 501         pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
 502         if (!pnp_res)
 503                 return NULL;
 504
 505         list_add_tail(&pnp_res->list, &dev->resources);
 506         return pnp_res;
 507 }
 508
 509 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 510                                           int flags)
 511 {
 512         struct pnp_resource *pnp_res;
 513         struct resource *res;
 514
 515         pnp_res = pnp_new_resource(dev);
 516         if (!pnp_res) {
 517                 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
 518                 return NULL;
 519         }
 520
 521         res = &pnp_res->res;
 522         res->flags = IORESOURCE_IRQ | flags;
 523         res->start = irq;
 524         res->end = irq;
 525
 526         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 527         return pnp_res;
 528 }
 529
 530 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
 531                                           int flags)
 532 {
 533         struct pnp_resource *pnp_res;
 534         struct resource *res;
 535
 536         pnp_res = pnp_new_resource(dev);
 537         if (!pnp_res) {
 538                 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
 539                 return NULL;
 540         }
 541
 542         res = &pnp_res->res;
 543         res->flags = IORESOURCE_DMA | flags;
 544         res->start = dma;
 545         res->end = dma;
 546
 547         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 548         return pnp_res;
 549 }
 550
 551 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
 552                                          resource_size_t start,
 553                                          resource_size_t end, int flags)
 554 {
 555         struct pnp_resource *pnp_res;
 556         struct resource *res;
 557
 558         pnp_res = pnp_new_resource(dev);
 559         if (!pnp_res) {
 560                 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
 561                         (unsigned long long) start,
 562                         (unsigned long long) end);
 563                 return NULL;
 564         }
 565
 566         res = &pnp_res->res;
 567         res->flags = IORESOURCE_IO | flags;
 568         res->start = start;
 569         res->end = end;
 570
 571         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 572         return pnp_res;
 573 }
 574
 575 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
 576                                           resource_size_t start,
 577                                           resource_size_t end, int flags)
 578 {
 579         struct pnp_resource *pnp_res;
 580         struct resource *res;
 581
 582         pnp_res = pnp_new_resource(dev);
 583         if (!pnp_res) {
 584                 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
 585                         (unsigned long long) start,
 586                         (unsigned long long) end);
 587                 return NULL;
 588         }
 589
 590         res = &pnp_res->res;
 591         res->flags = IORESOURCE_MEM | flags;
 592         res->start = start;
 593         res->end = end;
 594
 595         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 596         return pnp_res;
 597 }
 598
 599 struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev,
 600                                           resource_size_t start,
 601                                           resource_size_t end)
 602 {
 603         struct pnp_resource *pnp_res;
 604         struct resource *res;
 605
 606         pnp_res = pnp_new_resource(dev);
 607         if (!pnp_res) {
 608                 dev_err(&dev->dev, "can't add resource for BUS %#llx-%#llx\n",
 609                         (unsigned long long) start,
 610                         (unsigned long long) end);
 611                 return NULL;
 612         }
 613
 614         res = &pnp_res->res;
 615         res->flags = IORESOURCE_BUS;
 616         res->start = start;
 617         res->end = end;
 618
 619         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 620         return pnp_res;
 621 }
 622
 623 /*
 624  * Determine whether the specified resource is a possible configuration
 625  * for this device.
 626  */
 627 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
 628                         resource_size_t size)
 629 {
 630         struct pnp_option *option;
 631         struct pnp_port *port;
 632         struct pnp_mem *mem;
 633         struct pnp_irq *irq;
 634         struct pnp_dma *dma;
 635
 636         list_for_each_entry(option, &dev->options, list) {
 637                 if (option->type != type)
 638                         continue;
 639
 640                 switch (option->type) {
 641                 case IORESOURCE_IO:
 642                         port = &option->u.port;
 643                         if (port->min == start && port->size == size)
 644                                 return 1;
 645                         break;
 646                 case IORESOURCE_MEM:
 647                         mem = &option->u.mem;
 648                         if (mem->min == start && mem->size == size)
 649                                 return 1;
 650                         break;
 651                 case IORESOURCE_IRQ:
 652                         irq = &option->u.irq;
 653                         if (start < PNP_IRQ_NR &&
 654                             test_bit(start, irq->map.bits))
 655                                 return 1;
 656                         break;
 657                 case IORESOURCE_DMA:
 658                         dma = &option->u.dma;
 659                         if (dma->map & (1 << start))
 660                                 return 1;
 661                         break;
 662                 }
 663         }
 664
 665         return 0;
 666 }
 667 EXPORT_SYMBOL(pnp_possible_config);
 668
 669 int pnp_range_reserved(resource_size_t start, resource_size_t end)
 670 {
 671         struct pnp_dev *dev;
 672         struct pnp_resource *pnp_res;
 673         resource_size_t *dev_start, *dev_end;
 674
 675         pnp_for_each_dev(dev) {
 676                 list_for_each_entry(pnp_res, &dev->resources, list) {
 677                         dev_start = &pnp_res->res.start;
 678                         dev_end   = &pnp_res->res.end;
 679                         if (ranged_conflict(&start, &end, dev_start, dev_end))
 680                                 return 1;
 681                 }
 682         }
 683         return 0;
 684 }
 685 EXPORT_SYMBOL(pnp_range_reserved);
 686
 687 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 688 static int __init pnp_setup_reserve_irq(char *str)
 689 {
 690         int i;
 691
 692         for (i = 0; i < 16; i++)
 693                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 694                         break;
 695         return 1;
 696 }
 697
 698 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 699
 700 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 701 static int __init pnp_setup_reserve_dma(char *str)
 702 {
 703         int i;
 704
 705         for (i = 0; i < 8; i++)
 706                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 707                         break;
 708         return 1;
 709 }
 710
 711 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 712
 713 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 714 static int __init pnp_setup_reserve_io(char *str)
 715 {
 716         int i;
 717
 718         for (i = 0; i < 16; i++)
 719                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
 720                         break;
 721         return 1;
 722 }
 723
 724 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 725
 726 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 727 static int __init pnp_setup_reserve_mem(char *str)
 728 {
 729         int i;
 730
 731         for (i = 0; i < 16; i++)
 732                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 733                         break;
 734         return 1;
 735 }
 736
 737 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);