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                                 tport = &tres->start;
 215                                 tend = &tres->end;
 216                                 if (ranged_conflict(port, end, tport, tend))
 217                                         return 0;
 218                         }
 219                 }
 220         }
 221
 222         return 1;
 223 }
 224
 225 int pnp_check_mem(struct pnp_dev *dev, struct resource *res)
 226 {
 227         int i;
 228         struct pnp_dev *tdev;
 229         struct resource *tres;
 230         resource_size_t *addr, *end, *taddr, *tend;
 231
 232         addr = &res->start;
 233         end = &res->end;
 234
 235         /* if the resource doesn't exist, don't complain about it */
 236         if (cannot_compare(res->flags))
 237                 return 1;
 238
 239         /* check if the resource is already in use, skip if the
 240          * device is active because it itself may be in use */
 241         if (!dev->active) {
 242                 if (check_mem_region(*addr, length(addr, end)))
 243                         return 0;
 244         }
 245
 246         /* check if the resource is reserved */
 247         for (i = 0; i < 8; i++) {
 248                 int raddr = pnp_reserve_mem[i << 1];
 249                 int rend = pnp_reserve_mem[(i << 1) + 1] + raddr - 1;
 250                 if (ranged_conflict(addr, end, &raddr, &rend))
 251                         return 0;
 252         }
 253
 254         /* check for internal conflicts */
 255         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_MEM, i)); i++) {
 256                 if (tres != res && tres->flags & IORESOURCE_MEM) {
 257                         taddr = &tres->start;
 258                         tend = &tres->end;
 259                         if (ranged_conflict(addr, end, taddr, tend))
 260                                 return 0;
 261                 }
 262         }
 263
 264         /* check for conflicts with other pnp devices */
 265         pnp_for_each_dev(tdev) {
 266                 if (tdev == dev)
 267                         continue;
 268                 for (i = 0;
 269                      (tres = pnp_get_resource(tdev, IORESOURCE_MEM, i));
 270                      i++) {
 271                         if (tres->flags & IORESOURCE_MEM) {
 272                                 if (cannot_compare(tres->flags))
 273                                         continue;
 274                                 taddr = &tres->start;
 275                                 tend = &tres->end;
 276                                 if (ranged_conflict(addr, end, taddr, tend))
 277                                         return 0;
 278                         }
 279                 }
 280         }
 281
 282         return 1;
 283 }
 284
 285 static irqreturn_t pnp_test_handler(int irq, void *dev_id)
 286 {
 287         return IRQ_HANDLED;
 288 }
 289
 290 #ifdef CONFIG_PCI
 291 static int pci_dev_uses_irq(struct pnp_dev *pnp, struct pci_dev *pci,
 292                             unsigned int irq)
 293 {
 294         u32 class;
 295         u8 progif;
 296
 297         if (pci->irq == irq) {
 298                 pnp_dbg(&pnp->dev, "  device %s using irq %d\n",
 299                         pci_name(pci), irq);
 300                 return 1;
 301         }
 302
 303         /*
 304          * See pci_setup_device() and ata_pci_sff_activate_host() for
 305          * similar IDE legacy detection.
 306          */
 307         pci_read_config_dword(pci, PCI_CLASS_REVISION, &class);
 308         class >>= 8;            /* discard revision ID */
 309         progif = class & 0xff;
 310         class >>= 8;
 311
 312         if (class == PCI_CLASS_STORAGE_IDE) {
 313                 /*
 314                  * Unless both channels are native-PCI mode only,
 315                  * treat the compatibility IRQs as busy.
 316                  */
 317                 if ((progif & 0x5) != 0x5)
 318                         if (pci_get_legacy_ide_irq(pci, 0) == irq ||
 319                             pci_get_legacy_ide_irq(pci, 1) == irq) {
 320                                 pnp_dbg(&pnp->dev, "  legacy IDE device %s "
 321                                         "using irq %d\n", pci_name(pci), irq);
 322                                 return 1;
 323                         }
 324         }
 325
 326         return 0;
 327 }
 328 #endif
 329
 330 static int pci_uses_irq(struct pnp_dev *pnp, unsigned int irq)
 331 {
 332 #ifdef CONFIG_PCI
 333         struct pci_dev *pci = NULL;
 334
 335         for_each_pci_dev(pci) {
 336                 if (pci_dev_uses_irq(pnp, pci, irq)) {
 337                         pci_dev_put(pci);
 338                         return 1;
 339                 }
 340         }
 341 #endif
 342         return 0;
 343 }
 344
 345 int pnp_check_irq(struct pnp_dev *dev, struct resource *res)
 346 {
 347         int i;
 348         struct pnp_dev *tdev;
 349         struct resource *tres;
 350         resource_size_t *irq;
 351
 352         irq = &res->start;
 353
 354         /* if the resource doesn't exist, don't complain about it */
 355         if (cannot_compare(res->flags))
 356                 return 1;
 357
 358         /* check if the resource is valid */
 359         if (*irq < 0 || *irq > 15)
 360                 return 0;
 361
 362         /* check if the resource is reserved */
 363         for (i = 0; i < 16; i++) {
 364                 if (pnp_reserve_irq[i] == *irq)
 365                         return 0;
 366         }
 367
 368         /* check for internal conflicts */
 369         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_IRQ, i)); i++) {
 370                 if (tres != res && tres->flags & IORESOURCE_IRQ) {
 371                         if (tres->start == *irq)
 372                                 return 0;
 373                 }
 374         }
 375
 376         /* check if the resource is being used by a pci device */
 377         if (pci_uses_irq(dev, *irq))
 378                 return 0;
 379
 380         /* check if the resource is already in use, skip if the
 381          * device is active because it itself may be in use */
 382         if (!dev->active) {
 383                 if (request_irq(*irq, pnp_test_handler,
 384                                 IRQF_DISABLED | IRQF_PROBE_SHARED, "pnp", NULL))
 385                         return 0;
 386                 free_irq(*irq, NULL);
 387         }
 388
 389         /* check for conflicts with other pnp devices */
 390         pnp_for_each_dev(tdev) {
 391                 if (tdev == dev)
 392                         continue;
 393                 for (i = 0;
 394                      (tres = pnp_get_resource(tdev, IORESOURCE_IRQ, i));
 395                      i++) {
 396                         if (tres->flags & IORESOURCE_IRQ) {
 397                                 if (cannot_compare(tres->flags))
 398                                         continue;
 399                                 if (tres->start == *irq)
 400                                         return 0;
 401                         }
 402                 }
 403         }
 404
 405         return 1;
 406 }
 407
 408 int pnp_check_dma(struct pnp_dev *dev, struct resource *res)
 409 {
 410 #ifndef CONFIG_IA64
 411         int i;
 412         struct pnp_dev *tdev;
 413         struct resource *tres;
 414         resource_size_t *dma;
 415
 416         dma = &res->start;
 417
 418         /* if the resource doesn't exist, don't complain about it */
 419         if (cannot_compare(res->flags))
 420                 return 1;
 421
 422         /* check if the resource is valid */
 423         if (*dma < 0 || *dma == 4 || *dma > 7)
 424                 return 0;
 425
 426         /* check if the resource is reserved */
 427         for (i = 0; i < 8; i++) {
 428                 if (pnp_reserve_dma[i] == *dma)
 429                         return 0;
 430         }
 431
 432         /* check for internal conflicts */
 433         for (i = 0; (tres = pnp_get_resource(dev, IORESOURCE_DMA, i)); i++) {
 434                 if (tres != res && tres->flags & IORESOURCE_DMA) {
 435                         if (tres->start == *dma)
 436                                 return 0;
 437                 }
 438         }
 439
 440         /* check if the resource is already in use, skip if the
 441          * device is active because it itself may be in use */
 442         if (!dev->active) {
 443                 if (request_dma(*dma, "pnp"))
 444                         return 0;
 445                 free_dma(*dma);
 446         }
 447
 448         /* check for conflicts with other pnp devices */
 449         pnp_for_each_dev(tdev) {
 450                 if (tdev == dev)
 451                         continue;
 452                 for (i = 0;
 453                      (tres = pnp_get_resource(tdev, IORESOURCE_DMA, i));
 454                      i++) {
 455                         if (tres->flags & IORESOURCE_DMA) {
 456                                 if (cannot_compare(tres->flags))
 457                                         continue;
 458                                 if (tres->start == *dma)
 459                                         return 0;
 460                         }
 461                 }
 462         }
 463
 464         return 1;
 465 #else
 466         /* IA64 does not have legacy DMA */
 467         return 0;
 468 #endif
 469 }
 470
 471 unsigned long pnp_resource_type(struct resource *res)
 472 {
 473         return res->flags & (IORESOURCE_IO  | IORESOURCE_MEM |
 474                              IORESOURCE_IRQ | IORESOURCE_DMA |
 475                              IORESOURCE_BUS);
 476 }
 477
 478 struct resource *pnp_get_resource(struct pnp_dev *dev,
 479                                   unsigned long type, unsigned int num)
 480 {
 481         struct pnp_resource *pnp_res;
 482         struct resource *res;
 483
 484         list_for_each_entry(pnp_res, &dev->resources, list) {
 485                 res = &pnp_res->res;
 486                 if (pnp_resource_type(res) == type && num-- == 0)
 487                         return res;
 488         }
 489         return NULL;
 490 }
 491 EXPORT_SYMBOL(pnp_get_resource);
 492
 493 static struct pnp_resource *pnp_new_resource(struct pnp_dev *dev)
 494 {
 495         struct pnp_resource *pnp_res;
 496
 497         pnp_res = kzalloc(sizeof(struct pnp_resource), GFP_KERNEL);
 498         if (!pnp_res)
 499                 return NULL;
 500
 501         list_add_tail(&pnp_res->list, &dev->resources);
 502         return pnp_res;
 503 }
 504
 505 struct pnp_resource *pnp_add_irq_resource(struct pnp_dev *dev, int irq,
 506                                           int flags)
 507 {
 508         struct pnp_resource *pnp_res;
 509         struct resource *res;
 510
 511         pnp_res = pnp_new_resource(dev);
 512         if (!pnp_res) {
 513                 dev_err(&dev->dev, "can't add resource for IRQ %d\n", irq);
 514                 return NULL;
 515         }
 516
 517         res = &pnp_res->res;
 518         res->flags = IORESOURCE_IRQ | flags;
 519         res->start = irq;
 520         res->end = irq;
 521
 522         pnp_dbg(&dev->dev, "  add %pr\n", res);
 523         return pnp_res;
 524 }
 525
 526 struct pnp_resource *pnp_add_dma_resource(struct pnp_dev *dev, int dma,
 527                                           int flags)
 528 {
 529         struct pnp_resource *pnp_res;
 530         struct resource *res;
 531
 532         pnp_res = pnp_new_resource(dev);
 533         if (!pnp_res) {
 534                 dev_err(&dev->dev, "can't add resource for DMA %d\n", dma);
 535                 return NULL;
 536         }
 537
 538         res = &pnp_res->res;
 539         res->flags = IORESOURCE_DMA | flags;
 540         res->start = dma;
 541         res->end = dma;
 542
 543         pnp_dbg(&dev->dev, "  add %pr\n", res);
 544         return pnp_res;
 545 }
 546
 547 struct pnp_resource *pnp_add_io_resource(struct pnp_dev *dev,
 548                                          resource_size_t start,
 549                                          resource_size_t end, int flags)
 550 {
 551         struct pnp_resource *pnp_res;
 552         struct resource *res;
 553
 554         pnp_res = pnp_new_resource(dev);
 555         if (!pnp_res) {
 556                 dev_err(&dev->dev, "can't add resource for IO %#llx-%#llx\n",
 557                         (unsigned long long) start,
 558                         (unsigned long long) end);
 559                 return NULL;
 560         }
 561
 562         res = &pnp_res->res;
 563         res->flags = IORESOURCE_IO | flags;
 564         res->start = start;
 565         res->end = end;
 566
 567         pnp_dbg(&dev->dev, "  add %pr\n", res);
 568         return pnp_res;
 569 }
 570
 571 struct pnp_resource *pnp_add_mem_resource(struct pnp_dev *dev,
 572                                           resource_size_t start,
 573                                           resource_size_t end, int flags)
 574 {
 575         struct pnp_resource *pnp_res;
 576         struct resource *res;
 577
 578         pnp_res = pnp_new_resource(dev);
 579         if (!pnp_res) {
 580                 dev_err(&dev->dev, "can't add resource for MEM %#llx-%#llx\n",
 581                         (unsigned long long) start,
 582                         (unsigned long long) end);
 583                 return NULL;
 584         }
 585
 586         res = &pnp_res->res;
 587         res->flags = IORESOURCE_MEM | flags;
 588         res->start = start;
 589         res->end = end;
 590
 591         pnp_dbg(&dev->dev, "  add %pr\n", res);
 592         return pnp_res;
 593 }
 594
 595 struct pnp_resource *pnp_add_bus_resource(struct pnp_dev *dev,
 596                                           resource_size_t start,
 597                                           resource_size_t end)
 598 {
 599         struct pnp_resource *pnp_res;
 600         struct resource *res;
 601
 602         pnp_res = pnp_new_resource(dev);
 603         if (!pnp_res) {
 604                 dev_err(&dev->dev, "can't add resource for BUS %#llx-%#llx\n",
 605                         (unsigned long long) start,
 606                         (unsigned long long) end);
 607                 return NULL;
 608         }
 609
 610         res = &pnp_res->res;
 611         res->flags = IORESOURCE_BUS;
 612         res->start = start;
 613         res->end = end;
 614
 615         pnp_dbg(&dev->dev, "  add %pr\n", res);
 616         return pnp_res;
 617 }
 618
 619 /*
 620  * Determine whether the specified resource is a possible configuration
 621  * for this device.
 622  */
 623 int pnp_possible_config(struct pnp_dev *dev, int type, resource_size_t start,
 624                         resource_size_t size)
 625 {
 626         struct pnp_option *option;
 627         struct pnp_port *port;
 628         struct pnp_mem *mem;
 629         struct pnp_irq *irq;
 630         struct pnp_dma *dma;
 631
 632         list_for_each_entry(option, &dev->options, list) {
 633                 if (option->type != type)
 634                         continue;
 635
 636                 switch (option->type) {
 637                 case IORESOURCE_IO:
 638                         port = &option->u.port;
 639                         if (port->min == start && port->size == size)
 640                                 return 1;
 641                         break;
 642                 case IORESOURCE_MEM:
 643                         mem = &option->u.mem;
 644                         if (mem->min == start && mem->size == size)
 645                                 return 1;
 646                         break;
 647                 case IORESOURCE_IRQ:
 648                         irq = &option->u.irq;
 649                         if (start < PNP_IRQ_NR &&
 650                             test_bit(start, irq->map.bits))
 651                                 return 1;
 652                         break;
 653                 case IORESOURCE_DMA:
 654                         dma = &option->u.dma;
 655                         if (dma->map & (1 << start))
 656                                 return 1;
 657                         break;
 658                 }
 659         }
 660
 661         return 0;
 662 }
 663 EXPORT_SYMBOL(pnp_possible_config);
 664
 665 int pnp_range_reserved(resource_size_t start, resource_size_t end)
 666 {
 667         struct pnp_dev *dev;
 668         struct pnp_resource *pnp_res;
 669         resource_size_t *dev_start, *dev_end;
 670
 671         pnp_for_each_dev(dev) {
 672                 list_for_each_entry(pnp_res, &dev->resources, list) {
 673                         dev_start = &pnp_res->res.start;
 674                         dev_end   = &pnp_res->res.end;
 675                         if (ranged_conflict(&start, &end, dev_start, dev_end))
 676                                 return 1;
 677                 }
 678         }
 679         return 0;
 680 }
 681 EXPORT_SYMBOL(pnp_range_reserved);
 682
 683 /* format is: pnp_reserve_irq=irq1[,irq2] .... */
 684 static int __init pnp_setup_reserve_irq(char *str)
 685 {
 686         int i;
 687
 688         for (i = 0; i < 16; i++)
 689                 if (get_option(&str, &pnp_reserve_irq[i]) != 2)
 690                         break;
 691         return 1;
 692 }
 693
 694 __setup("pnp_reserve_irq=", pnp_setup_reserve_irq);
 695
 696 /* format is: pnp_reserve_dma=dma1[,dma2] .... */
 697 static int __init pnp_setup_reserve_dma(char *str)
 698 {
 699         int i;
 700
 701         for (i = 0; i < 8; i++)
 702                 if (get_option(&str, &pnp_reserve_dma[i]) != 2)
 703                         break;
 704         return 1;
 705 }
 706
 707 __setup("pnp_reserve_dma=", pnp_setup_reserve_dma);
 708
 709 /* format is: pnp_reserve_io=io1,size1[,io2,size2] .... */
 710 static int __init pnp_setup_reserve_io(char *str)
 711 {
 712         int i;
 713
 714         for (i = 0; i < 16; i++)
 715                 if (get_option(&str, &pnp_reserve_io[i]) != 2)
 716                         break;
 717         return 1;
 718 }
 719
 720 __setup("pnp_reserve_io=", pnp_setup_reserve_io);
 721
 722 /* format is: pnp_reserve_mem=mem1,size1[,mem2,size2] .... */
 723 static int __init pnp_setup_reserve_mem(char *str)
 724 {
 725         int i;
 726
 727         for (i = 0; i < 16; i++)
 728                 if (get_option(&str, &pnp_reserve_mem[i]) != 2)
 729                         break;
 730         return 1;
 731 }
 732
 733 __setup("pnp_reserve_mem=", pnp_setup_reserve_mem);