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 #ifdef CONFIG_ISA_DMA_API
 413 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
 414 {
 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 }
 470 #endif /* CONFIG_ISA_DMA_API */
 471
 472 unsigned long pnp_resource_type(struct resource *res)
 473 {
 474         return res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
 475                              IORESOURCE_IRQ | IORESOURCE_DMA |
 476                              IORESOURCE_BUS);
 477 }
 478
 479 struct resource *pnp_get_resource(struct pnp_dev *dev,
 480                                   unsigned long type, unsigned int num)
 481 {
 482         struct pnp_resource *pnp_res;
 483         struct resource *res;
 484
 485         list_for_each_entry(pnp_res, &dev->resources, list) {
 486                 res = &pnp_res->res;
 487                 if (pnp_resource_type(res) == type && num-- == 0)
 488                         return res;
 489         }
 490         return NULL;
 491 }
 492 EXPORT_SYMBOL(pnp_get_resource);
 493
 494 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
 495 {
 496         struct pnp_resource *pnp_res;
 497
 498         pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
 499         if (!pnp_res)
 500                 return NULL;
 501
 502         list_add_tail(&pnp_res->list, &dev->resources);
 503         return pnp_res;
 504 }
 505
 506 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 507                                           int flags)
 508 {
 509         struct pnp_resource *pnp_res;
 510         struct resource *res;
 511
 512         pnp_res = pnp_new_resource(dev);
 513         if (!pnp_res) {
 514                 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
 515                 return NULL;
 516         }
 517
 518         res = &pnp_res->res;
 519         res->flags = IORESOURCE_IRQ | flags;
 520         res->start = irq;
 521         res->end = irq;
 522
 523         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 524         return pnp_res;
 525 }
 526
 527 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
 528                                           int flags)
 529 {
 530         struct pnp_resource *pnp_res;
 531         struct resource *res;
 532
 533         pnp_res = pnp_new_resource(dev);
 534         if (!pnp_res) {
 535                 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
 536                 return NULL;
 537         }
 538
 539         res = &pnp_res->res;
 540         res->flags = IORESOURCE_DMA | flags;
 541         res->start = dma;
 542         res->end = dma;
 543
 544         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 545         return pnp_res;
 546 }
 547
 548 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
 549                                          resource_size_t start,
 550                                          resource_size_t end, int flags)
 551 {
 552         struct pnp_resource *pnp_res;
 553         struct resource *res;
 554
 555         pnp_res = pnp_new_resource(dev);
 556         if (!pnp_res) {
 557                 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
 558                         (unsigned long long) start,
 559                         (unsigned long long) end);
 560                 return NULL;
 561         }
 562
 563         res = &pnp_res->res;
 564         res->flags = IORESOURCE_IO | flags;
 565         res->start = start;
 566         res->end = end;
 567
 568         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 569         return pnp_res;
 570 }
 571
 572 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
 573                                           resource_size_t start,
 574                                           resource_size_t end, int flags)
 575 {
 576         struct pnp_resource *pnp_res;
 577         struct resource *res;
 578
 579         pnp_res = pnp_new_resource(dev);
 580         if (!pnp_res) {
 581                 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
 582                         (unsigned long long) start,
 583                         (unsigned long long) end);
 584                 return NULL;
 585         }
 586
 587         res = &pnp_res->res;
 588         res->flags = IORESOURCE_MEM | flags;
 589         res->start = start;
 590         res->end = end;
 591
 592         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 593         return pnp_res;
 594 }
 595
 596 struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev,
 597                                           resource_size_t start,
 598                                           resource_size_t end)
 599 {
 600         struct pnp_resource *pnp_res;
 601         struct resource *res;
 602
 603         pnp_res = pnp_new_resource(dev);
 604         if (!pnp_res) {
 605                 dev_err(&dev->dev, "can't add resource for BUS %#llx-%#llx\n",
 606                         (unsigned long long) start,
 607                         (unsigned long long) end);
 608                 return NULL;
 609         }
 610
 611         res = &pnp_res->res;
 612         res->flags = IORESOURCE_BUS;
 613         res->start = start;
 614         res->end = end;
 615
 616         dev_printk(KERN_DEBUG, &dev->dev, "%pR\n", res);
 617         return pnp_res;
 618 }
 619
 620 /*
 621  * Determine whether the specified resource is a possible configuration
 622  * for this device.
 623  */
 624 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
 625                         resource_size_t size)
 626 {
 627         struct pnp_option *option;
 628         struct pnp_port *port;
 629         struct pnp_mem *mem;
 630         struct pnp_irq *irq;
 631         struct pnp_dma *dma;
 632
 633         list_for_each_entry(option, &dev->options, list) {
 634                 if (option->type != type)
 635                         continue;
 636
 637                 switch (option->type) {
 638                 case IORESOURCE_IO:
 639                         port = &option->u.port;
 640                         if (port->min == start && port->size == size)
 641                                 return 1;
 642                         break;
 643                 case IORESOURCE_MEM:
 644                         mem = &option->u.mem;
 645                         if (mem->min == start && mem->size == size)
 646                                 return 1;
 647                         break;
 648                 case IORESOURCE_IRQ:
 649                         irq = &option->u.irq;
 650                         if (start < PNP_IRQ_NR &&
 651                             test_bit(start, irq->map.bits))
 652                                 return 1;
 653                         break;
 654                 case IORESOURCE_DMA:
 655                         dma = &option->u.dma;
 656                         if (dma->map & (1 << start))
 657                                 return 1;
 658                         break;
 659                 }
 660         }
 661
 662         return 0;
 663 }
 664 EXPORT_SYMBOL(pnp_possible_config);
 665
 666 int pnp_range_reserved(resource_size_t start, resource_size_t end)
 667 {
 668         struct pnp_dev *dev;
 669         struct pnp_resource *pnp_res;
 670         resource_size_t *dev_start, *dev_end;
 671
 672         pnp_for_each_dev(dev) {
 673                 list_for_each_entry(pnp_res, &dev->resources, list) {
 674                         dev_start = &pnp_res->res.start;
 675                         dev_end   = &pnp_res->res.end;
 676                         if (ranged_conflict(&start, &end, dev_start, dev_end))
 677                                 return 1;
 678                 }
 679         }
 680         return 0;
 681 }
 682 EXPORT_SYMBOL(pnp_range_reserved);
 683
 684 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 685 static int __init pnp_setup_reserve_irq(char *str)
 686 {
 687         int i;
 688
 689         for (i = 0; i < 16; i++)
 690                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 691                         break;
 692         return 1;
 693 }
 694
 695 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 696
 697 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 698 static int __init pnp_setup_reserve_dma(char *str)
 699 {
 700         int i;
 701
 702         for (i = 0; i < 8; i++)
 703                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 704                         break;
 705         return 1;
 706 }
 707
 708 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 709
 710 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 711 static int __init pnp_setup_reserve_io(char *str)
 712 {
 713         int i;
 714
 715         for (i = 0; i < 16; i++)
 716                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
 717                         break;
 718         return 1;
 719 }
 720
 721 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 722
 723 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 724 static int __init pnp_setup_reserve_mem(char *str)
 725 {
 726         int i;
 727
 728         for (i = 0; i < 16; i++)
 729                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 730                         break;
 731         return 1;
 732 }
 733
 734 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);