arch/blackfin/kernel/setup.c

   1 /*
   2  * arch/blackfin/kernel/setup.c
   3  *
   4  * Copyright 2004-2006 Analog Devices Inc.
   5  *
   6  * Enter bugs at http://blackfin.uclinux.org/
   7  *
   8  * Licensed under the GPL-2 or later.
   9  */
  10
  11 #include <linux/delay.h>
  12 #include <linux/console.h>
  13 #include <linux/bootmem.h>
  14 #include <linux/seq_file.h>
  15 #include <linux/cpu.h>
  16 #include <linux/module.h>
  17 #include <linux/tty.h>
  18 #include <linux/pfn.h>
  19
  20 #include <linux/ext2_fs.h>
  21 #include <linux/cramfs_fs.h>
  22 #include <linux/romfs_fs.h>
  23
  24 #include <asm/cplb.h>
  25 #include <asm/cacheflush.h>
  26 #include <asm/blackfin.h>
  27 #include <asm/cplbinit.h>
  28 #include <asm/div64.h>
  29 #include <asm/fixed_code.h>
  30 #include <asm/early_printk.h>
  31
  32 static DEFINE_PER_CPU(struct cpu, cpu_devices);
  33
  34 u16 _bfin_swrst;
  35 EXPORT_SYMBOL(_bfin_swrst);
  36
  37 unsigned long memory_start, memory_end, physical_mem_end;
  38 unsigned long _rambase, _ramstart, _ramend;
  39 unsigned long reserved_mem_dcache_on;
  40 unsigned long reserved_mem_icache_on;
  41 EXPORT_SYMBOL(memory_start);
  42 EXPORT_SYMBOL(memory_end);
  43 EXPORT_SYMBOL(physical_mem_end);
  44 EXPORT_SYMBOL(_ramend);
  45
  46 #ifdef CONFIG_MTD_UCLINUX
  47 unsigned long memory_mtd_end, memory_mtd_start, mtd_size;
  48 unsigned long _ebss;
  49 EXPORT_SYMBOL(memory_mtd_end);
  50 EXPORT_SYMBOL(memory_mtd_start);
  51 EXPORT_SYMBOL(mtd_size);
  52 #endif
  53
  54 char __initdata command_line[COMMAND_LINE_SIZE];
  55 void __initdata *init_retx, *init_saved_retx, *init_saved_seqstat,
  56         *init_saved_icplb_fault_addr, *init_saved_dcplb_fault_addr;
  57
  58 /* boot memmap, for parsing "memmap=" */
  59 #define BFIN_MEMMAP_MAX         128 /* number of entries in bfin_memmap */
  60 #define BFIN_MEMMAP_RAM         1
  61 #define BFIN_MEMMAP_RESERVED    2
  62 struct bfin_memmap {
  63         int nr_map;
  64         struct bfin_memmap_entry {
  65                 unsigned long long addr; /* start of memory segment */
  66                 unsigned long long size;
  67                 unsigned long type;
  68         } map[BFIN_MEMMAP_MAX];
  69 } bfin_memmap __initdata;
  70
  71 /* for memmap sanitization */
  72 struct change_member {
  73         struct bfin_memmap_entry *pentry; /* pointer to original entry */
  74         unsigned long long addr; /* address for this change point */
  75 };
  76 static struct change_member change_point_list[2*BFIN_MEMMAP_MAX] __initdata;
  77 static struct change_member *change_point[2*BFIN_MEMMAP_MAX] __initdata;
  78 static struct bfin_memmap_entry *overlap_list[BFIN_MEMMAP_MAX] __initdata;
  79 static struct bfin_memmap_entry new_map[BFIN_MEMMAP_MAX] __initdata;
  80
  81 void __init bfin_cache_init(void)
  82 {
  83 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
  84         generate_cplb_tables();
  85 #endif
  86
  87 #ifdef CONFIG_BFIN_ICACHE
  88         bfin_icache_init();
  89         printk(KERN_INFO "Instruction Cache Enabled\n");
  90 #endif
  91
  92 #ifdef CONFIG_BFIN_DCACHE
  93         bfin_dcache_init();
  94         printk(KERN_INFO "Data Cache Enabled"
  95 # if defined CONFIG_BFIN_WB
  96                 " (write-back)"
  97 # elif defined CONFIG_BFIN_WT
  98                 " (write-through)"
  99 # endif
 100                 "\n");
 101 #endif
 102 }
 103
 104 void __init bfin_relocate_l1_mem(void)
 105 {
 106         unsigned long l1_code_length;
 107         unsigned long l1_data_a_length;
 108         unsigned long l1_data_b_length;
 109         unsigned long l2_length;
 110
 111         l1_code_length = _etext_l1 - _stext_l1;
 112         if (l1_code_length > L1_CODE_LENGTH)
 113                 panic("L1 Instruction SRAM Overflow\n");
 114         /* cannot complain as printk is not available as yet.
 115          * But we can continue booting and complain later!
 116          */
 117
 118         /* Copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
 119         dma_memcpy(_stext_l1, _l1_lma_start, l1_code_length);
 120
 121         l1_data_a_length = _ebss_l1 - _sdata_l1;
 122         if (l1_data_a_length > L1_DATA_A_LENGTH)
 123                 panic("L1 Data SRAM Bank A Overflow\n");
 124
 125         /* Copy _sdata_l1 to _ebss_l1 to L1 data bank A SRAM */
 126         dma_memcpy(_sdata_l1, _l1_lma_start + l1_code_length, l1_data_a_length);
 127
 128         l1_data_b_length = _ebss_b_l1 - _sdata_b_l1;
 129         if (l1_data_b_length > L1_DATA_B_LENGTH)
 130                 panic("L1 Data SRAM Bank B Overflow\n");
 131
 132         /* Copy _sdata_b_l1 to _ebss_b_l1 to L1 data bank B SRAM */
 133         dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
 134                         l1_data_a_length, l1_data_b_length);
 135
 136         if (L2_LENGTH != 0) {
 137                 l2_length = _ebss_l2 - _stext_l2;
 138                 if (l2_length > L2_LENGTH)
 139                         panic("L2 SRAM Overflow\n");
 140
 141                 /* Copy _stext_l2 to _edata_l2 to L2 SRAM */
 142                 dma_memcpy(_stext_l2, _l2_lma_start, l2_length);
 143         }
 144 }
 145
 146 /* add_memory_region to memmap */
 147 static void __init add_memory_region(unsigned long long start,
 148                               unsigned long long size, int type)
 149 {
 150         int i;
 151
 152         i = bfin_memmap.nr_map;
 153
 154         if (i == BFIN_MEMMAP_MAX) {
 155                 printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 156                 return;
 157         }
 158
 159         bfin_memmap.map[i].addr = start;
 160         bfin_memmap.map[i].size = size;
 161         bfin_memmap.map[i].type = type;
 162         bfin_memmap.nr_map++;
 163 }
 164
 165 /*
 166  * Sanitize the boot memmap, removing overlaps.
 167  */
 168 static int __init sanitize_memmap(struct bfin_memmap_entry *map, int *pnr_map)
 169 {
 170         struct change_member *change_tmp;
 171         unsigned long current_type, last_type;
 172         unsigned long long last_addr;
 173         int chgidx, still_changing;
 174         int overlap_entries;
 175         int new_entry;
 176         int old_nr, new_nr, chg_nr;
 177         int i;
 178
 179         /*
 180                 Visually we're performing the following (1,2,3,4 = memory types)
 181
 182                 Sample memory map (w/overlaps):
 183                    ____22__________________
 184                    ______________________4_
 185                    ____1111________________
 186                    _44_____________________
 187                    11111111________________
 188                    ____________________33__
 189                    ___________44___________
 190                    __________33333_________
 191                    ______________22________
 192                    ___________________2222_
 193                    _________111111111______
 194                    _____________________11_
 195                    _________________4______
 196
 197                 Sanitized equivalent (no overlap):
 198                    1_______________________
 199                    _44_____________________
 200                    ___1____________________
 201                    ____22__________________
 202                    ______11________________
 203                    _________1______________
 204                    __________3_____________
 205                    ___________44___________
 206                    _____________33_________
 207                    _______________2________
 208                    ________________1_______
 209                    _________________4______
 210                    ___________________2____
 211                    ____________________33__
 212                    ______________________4_
 213         */
 214         /* if there's only one memory region, don't bother */
 215         if (*pnr_map < 2)
 216                 return -1;
 217
 218         old_nr = *pnr_map;
 219
 220         /* bail out if we find any unreasonable addresses in memmap */
 221         for (i = 0; i < old_nr; i++)
 222                 if (map[i].addr + map[i].size < map[i].addr)
 223                         return -1;
 224
 225         /* create pointers for initial change-point information (for sorting) */
 226         for (i = 0; i < 2*old_nr; i++)
 227                 change_point[i] = &change_point_list[i];
 228
 229         /* record all known change-points (starting and ending addresses),
 230            omitting those that are for empty memory regions */
 231         chgidx = 0;
 232         for (i = 0; i < old_nr; i++)    {
 233                 if (map[i].size != 0) {
 234                         change_point[chgidx]->addr = map[i].addr;
 235                         change_point[chgidx++]->pentry = &map[i];
 236                         change_point[chgidx]->addr = map[i].addr + map[i].size;
 237                         change_point[chgidx++]->pentry = &map[i];
 238                 }
 239         }
 240         chg_nr = chgidx;        /* true number of change-points */
 241
 242         /* sort change-point list by memory addresses (low -> high) */
 243         still_changing = 1;
 244         while (still_changing)  {
 245                 still_changing = 0;
 246                 for (i = 1; i < chg_nr; i++)  {
 247                         /* if <current_addr> > <last_addr>, swap */
 248                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 249                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 250                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 251                                  (change_point[i]->addr == change_point[i]->pentry->addr) &&
 252                                  (change_point[i-1]->addr != change_point[i-1]->pentry->addr))
 253                            ) {
 254                                 change_tmp = change_point[i];
 255                                 change_point[i] = change_point[i-1];
 256                                 change_point[i-1] = change_tmp;
 257                                 still_changing = 1;
 258                         }
 259                 }
 260         }
 261
 262         /* create a new memmap, removing overlaps */
 263         overlap_entries = 0;     /* number of entries in the overlap table */
 264         new_entry = 0;   /* index for creating new memmap entries */
 265         last_type = 0;           /* start with undefined memory type */
 266         last_addr = 0;           /* start with 0 as last starting address */
 267         /* loop through change-points, determining affect on the new memmap */
 268         for (chgidx = 0; chgidx < chg_nr; chgidx++) {
 269                 /* keep track of all overlapping memmap entries */
 270                 if (change_point[chgidx]->addr == change_point[chgidx]->pentry->addr) {
 271                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 272                         overlap_list[overlap_entries++] = change_point[chgidx]->pentry;
 273                 } else {
 274                         /* remove entry from list (order independent, so swap with last) */
 275                         for (i = 0; i < overlap_entries; i++) {
 276                                 if (overlap_list[i] == change_point[chgidx]->pentry)
 277                                         overlap_list[i] = overlap_list[overlap_entries-1];
 278                         }
 279                         overlap_entries--;
 280                 }
 281                 /* if there are overlapping entries, decide which "type" to use */
 282                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 283                 current_type = 0;
 284                 for (i = 0; i < overlap_entries; i++)
 285                         if (overlap_list[i]->type > current_type)
 286                                 current_type = overlap_list[i]->type;
 287                 /* continue building up new memmap based on this information */
 288                 if (current_type != last_type)  {
 289                         if (last_type != 0) {
 290                                 new_map[new_entry].size =
 291                                         change_point[chgidx]->addr - last_addr;
 292                                 /* move forward only if the new size was non-zero */
 293                                 if (new_map[new_entry].size != 0)
 294                                         if (++new_entry >= BFIN_MEMMAP_MAX)
 295                                                 break;  /* no more space left for new entries */
 296                         }
 297                         if (current_type != 0) {
 298                                 new_map[new_entry].addr = change_point[chgidx]->addr;
 299                                 new_map[new_entry].type = current_type;
 300                                 last_addr = change_point[chgidx]->addr;
 301                         }
 302                         last_type = current_type;
 303                 }
 304         }
 305         new_nr = new_entry;   /* retain count for new entries */
 306
 307         /* copy new  mapping into original location */
 308         memcpy(map, new_map, new_nr*sizeof(struct bfin_memmap_entry));
 309         *pnr_map = new_nr;
 310
 311         return 0;
 312 }
 313
 314 static void __init print_memory_map(char *who)
 315 {
 316         int i;
 317
 318         for (i = 0; i < bfin_memmap.nr_map; i++) {
 319                 printk(KERN_DEBUG " %s: %016Lx - %016Lx ", who,
 320                         bfin_memmap.map[i].addr,
 321                         bfin_memmap.map[i].addr + bfin_memmap.map[i].size);
 322                 switch (bfin_memmap.map[i].type) {
 323                 case BFIN_MEMMAP_RAM:
 324                                 printk("(usable)\n");
 325                                 break;
 326                 case BFIN_MEMMAP_RESERVED:
 327                                 printk("(reserved)\n");
 328                                 break;
 329                 default:        printk("type %lu\n", bfin_memmap.map[i].type);
 330                                 break;
 331                 }
 332         }
 333 }
 334
 335 static __init int parse_memmap(char *arg)
 336 {
 337         unsigned long long start_at, mem_size;
 338
 339         if (!arg)
 340                 return -EINVAL;
 341
 342         mem_size = memparse(arg, &arg);
 343         if (*arg == '@') {
 344                 start_at = memparse(arg+1, &arg);
 345                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RAM);
 346         } else if (*arg == '$') {
 347                 start_at = memparse(arg+1, &arg);
 348                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RESERVED);
 349         }
 350
 351         return 0;
 352 }
 353
 354 /*
 355  * Initial parsing of the command line.  Currently, we support:
 356  *  - Controlling the linux memory size: mem=xxx[KMG]
 357  *  - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
 358  *       $ -> reserved memory is dcacheable
 359  *       # -> reserved memory is icacheable
 360  *  - "memmap=XXX[KkmM][@][$]XXX[KkmM]" defines a memory region
 361  *       @ from <start> to <start>+<mem>, type RAM
 362  *       $ from <start> to <start>+<mem>, type RESERVED
 363  *
 364  */
 365 static __init void parse_cmdline_early(char *cmdline_p)
 366 {
 367         char c = ' ', *to = cmdline_p;
 368         unsigned int memsize;
 369         for (;;) {
 370                 if (c == ' ') {
 371                         if (!memcmp(to, "mem=", 4)) {
 372                                 to += 4;
 373                                 memsize = memparse(to, &to);
 374                                 if (memsize)
 375                                         _ramend = memsize;
 376
 377                         } else if (!memcmp(to, "max_mem=", 8)) {
 378                                 to += 8;
 379                                 memsize = memparse(to, &to);
 380                                 if (memsize) {
 381                                         physical_mem_end = memsize;
 382                                         if (*to != ' ') {
 383                                                 if (*to == '$'
 384                                                     || *(to + 1) == '$')
 385                                                         reserved_mem_dcache_on =
 386                                                             1;
 387                                                 if (*to == '#'
 388                                                     || *(to + 1) == '#')
 389                                                         reserved_mem_icache_on =
 390                                                             1;
 391                                         }
 392                                 }
 393                         } else if (!memcmp(to, "earlyprintk=", 12)) {
 394                                 to += 12;
 395                                 setup_early_printk(to);
 396                         } else if (!memcmp(to, "memmap=", 7)) {
 397                                 to += 7;
 398                                 parse_memmap(to);
 399                         }
 400                 }
 401                 c = *(to++);
 402                 if (!c)
 403                         break;
 404         }
 405 }
 406
 407 /*
 408  * Setup memory defaults from user config.
 409  * The physical memory layout looks like:
 410  *
 411  *  [_rambase, _ramstart]:              kernel image
 412  *  [memory_start, memory_end]:         dynamic memory managed by kernel
 413  *  [memory_end, _ramend]:              reserved memory
 414  *      [meory_mtd_start(memory_end),
 415  *              memory_mtd_start + mtd_size]:   rootfs (if any)
 416  *      [_ramend - DMA_UNCACHED_REGION,
 417  *              _ramend]:                       uncached DMA region
 418  *  [_ramend, physical_mem_end]:        memory not managed by kernel
 419  *
 420  */
 421 static __init void  memory_setup(void)
 422 {
 423 #ifdef CONFIG_MTD_UCLINUX
 424         unsigned long mtd_phys = 0;
 425 #endif
 426
 427         _rambase = (unsigned long)_stext;
 428         _ramstart = (unsigned long)_end;
 429
 430         if (DMA_UNCACHED_REGION > (_ramend - _ramstart)) {
 431                 console_init();
 432                 panic("DMA region exceeds memory limit: %lu.\n",
 433                         _ramend - _ramstart);
 434         }
 435         memory_end = _ramend - DMA_UNCACHED_REGION;
 436
 437 #ifdef CONFIG_MPU
 438         /* Round up to multiple of 4MB.  */
 439         memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
 440 #else
 441         memory_start = PAGE_ALIGN(_ramstart);
 442 #endif
 443
 444 #if defined(CONFIG_MTD_UCLINUX)
 445         /* generic memory mapped MTD driver */
 446         memory_mtd_end = memory_end;
 447
 448         mtd_phys = _ramstart;
 449         mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));
 450
 451 # if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
 452         if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
 453                 mtd_size =
 454                     PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
 455 # endif
 456
 457 # if defined(CONFIG_CRAMFS)
 458         if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
 459                 mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
 460 # endif
 461
 462 # if defined(CONFIG_ROMFS_FS)
 463         if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
 464             && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
 465                 mtd_size =
 466                     PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
 467 #  if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
 468         /* Due to a Hardware Anomaly we need to limit the size of usable
 469          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 470          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 471          */
 472 #   if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 473         if (memory_end >= 56 * 1024 * 1024)
 474                 memory_end = 56 * 1024 * 1024;
 475 #   else
 476         if (memory_end >= 60 * 1024 * 1024)
 477                 memory_end = 60 * 1024 * 1024;
 478 #   endif                               /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 479 #  endif                                /* ANOMALY_05000263 */
 480 # endif                         /* CONFIG_ROMFS_FS */
 481
 482         memory_end -= mtd_size;
 483
 484         if (mtd_size == 0) {
 485                 console_init();
 486                 panic("Don't boot kernel without rootfs attached.\n");
 487         }
 488
 489         /* Relocate MTD image to the top of memory after the uncached memory area */
 490         dma_memcpy((char *)memory_end, _end, mtd_size);
 491
 492         memory_mtd_start = memory_end;
 493         _ebss = memory_mtd_start;       /* define _ebss for compatible */
 494 #endif                          /* CONFIG_MTD_UCLINUX */
 495
 496 #if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
 497         /* Due to a Hardware Anomaly we need to limit the size of usable
 498          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 499          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 500          */
 501 #if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 502         if (memory_end >= 56 * 1024 * 1024)
 503                 memory_end = 56 * 1024 * 1024;
 504 #else
 505         if (memory_end >= 60 * 1024 * 1024)
 506                 memory_end = 60 * 1024 * 1024;
 507 #endif                          /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 508         printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
 509 #endif                          /* ANOMALY_05000263 */
 510
 511 #ifdef CONFIG_MPU
 512         page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
 513         page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
 514 #endif
 515
 516 #if !defined(CONFIG_MTD_UCLINUX)
 517         /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
 518         memory_end -= SIZE_4K;
 519 #endif
 520
 521         init_mm.start_code = (unsigned long)_stext;
 522         init_mm.end_code = (unsigned long)_etext;
 523         init_mm.end_data = (unsigned long)_edata;
 524         init_mm.brk = (unsigned long)0;
 525
 526         printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
 527         printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
 528
 529         printk(KERN_INFO "Memory map:\n"
 530                 KERN_INFO "  fixedcode = 0x%p-0x%p\n"
 531                 KERN_INFO "  text      = 0x%p-0x%p\n"
 532                 KERN_INFO "  rodata    = 0x%p-0x%p\n"
 533                 KERN_INFO "  bss       = 0x%p-0x%p\n"
 534                 KERN_INFO "  data      = 0x%p-0x%p\n"
 535                 KERN_INFO "    stack   = 0x%p-0x%p\n"
 536                 KERN_INFO "  init      = 0x%p-0x%p\n"
 537                 KERN_INFO "  available = 0x%p-0x%p\n"
 538 #ifdef CONFIG_MTD_UCLINUX
 539                 KERN_INFO "  rootfs    = 0x%p-0x%p\n"
 540 #endif
 541 #if DMA_UNCACHED_REGION > 0
 542                 KERN_INFO "  DMA Zone  = 0x%p-0x%p\n"
 543 #endif
 544                 , (void *)FIXED_CODE_START, (void *)FIXED_CODE_END,
 545                 _stext, _etext,
 546                 __start_rodata, __end_rodata,
 547                 __bss_start, __bss_stop,
 548                 _sdata, _edata,
 549                 (void *)&init_thread_union,
 550                 (void *)((int)(&init_thread_union) + 0x2000),
 551                 __init_begin, __init_end,
 552                 (void *)_ramstart, (void *)memory_end
 553 #ifdef CONFIG_MTD_UCLINUX
 554                 , (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
 555 #endif
 556 #if DMA_UNCACHED_REGION > 0
 557                 , (void *)(_ramend - DMA_UNCACHED_REGION), (void *)(_ramend)
 558 #endif
 559                 );
 560 }
 561
 562 /*
 563  * Find the lowest, highest page frame number we have available
 564  */
 565 void __init find_min_max_pfn(void)
 566 {
 567         int i;
 568
 569         max_pfn = 0;
 570         min_low_pfn = memory_end;
 571
 572         for (i = 0; i < bfin_memmap.nr_map; i++) {
 573                 unsigned long start, end;
 574                 /* RAM? */
 575                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 576                         continue;
 577                 start = PFN_UP(bfin_memmap.map[i].addr);
 578                 end = PFN_DOWN(bfin_memmap.map[i].addr +
 579                                 bfin_memmap.map[i].size);
 580                 if (start >= end)
 581                         continue;
 582                 if (end > max_pfn)
 583                         max_pfn = end;
 584                 if (start < min_low_pfn)
 585                         min_low_pfn = start;
 586         }
 587 }
 588
 589 static __init void setup_bootmem_allocator(void)
 590 {
 591         int bootmap_size;
 592         int i;
 593         unsigned long start_pfn, end_pfn;
 594         unsigned long curr_pfn, last_pfn, size;
 595
 596         /* mark memory between memory_start and memory_end usable */
 597         add_memory_region(memory_start,
 598                 memory_end - memory_start, BFIN_MEMMAP_RAM);
 599         /* sanity check for overlap */
 600         sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);
 601         print_memory_map("boot memmap");
 602
 603         /* intialize globals in linux/bootmem.h */
 604         find_min_max_pfn();
 605         /* pfn of the last usable page frame */
 606         if (max_pfn > memory_end >> PAGE_SHIFT)
 607                 max_pfn = memory_end >> PAGE_SHIFT;
 608         /* pfn of last page frame directly mapped by kernel */
 609         max_low_pfn = max_pfn;
 610         /* pfn of the first usable page frame after kernel image*/
 611         if (min_low_pfn < memory_start >> PAGE_SHIFT)
 612                 min_low_pfn = memory_start >> PAGE_SHIFT;
 613
 614         start_pfn = PAGE_OFFSET >> PAGE_SHIFT;
 615         end_pfn = memory_end >> PAGE_SHIFT;
 616
 617         /*
 618          * give all the memory to the bootmap allocator,  tell it to put the
 619          * boot mem_map at the start of memory.
 620          */
 621         bootmap_size = init_bootmem_node(NODE_DATA(0),
 622                         memory_start >> PAGE_SHIFT,     /* map goes here */
 623                         start_pfn, end_pfn);
 624
 625         /* register the memmap regions with the bootmem allocator */
 626         for (i = 0; i < bfin_memmap.nr_map; i++) {
 627                 /*
 628                  * Reserve usable memory
 629                  */
 630                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 631                         continue;
 632                 /*
 633                  * We are rounding up the start address of usable memory:
 634                  */
 635                 curr_pfn = PFN_UP(bfin_memmap.map[i].addr);
 636                 if (curr_pfn >= end_pfn)
 637                         continue;
 638                 /*
 639                  * ... and at the end of the usable range downwards:
 640                  */
 641                 last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +
 642                                          bfin_memmap.map[i].size);
 643
 644                 if (last_pfn > end_pfn)
 645                         last_pfn = end_pfn;
 646
 647                 /*
 648                  * .. finally, did all the rounding and playing
 649                  * around just make the area go away?
 650                  */
 651                 if (last_pfn <= curr_pfn)
 652                         continue;
 653
 654                 size = last_pfn - curr_pfn;
 655                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 656         }
 657
 658         /* reserve memory before memory_start, including bootmap */
 659         reserve_bootmem(PAGE_OFFSET,
 660                 memory_start + bootmap_size + PAGE_SIZE - 1 - PAGE_OFFSET,
 661                 BOOTMEM_DEFAULT);
 662 }
 663
 664 #define EBSZ_TO_MEG(ebsz) \
 665 ({ \
 666         int meg = 0; \
 667         switch (ebsz & 0xf) { \
 668                 case 0x1: meg =  16; break; \
 669                 case 0x3: meg =  32; break; \
 670                 case 0x5: meg =  64; break; \
 671                 case 0x7: meg = 128; break; \
 672                 case 0x9: meg = 256; break; \
 673                 case 0xb: meg = 512; break; \
 674         } \
 675         meg; \
 676 })
 677 static inline int __init get_mem_size(void)
 678 {
 679 #if defined(EBIU_SDBCTL)
 680 # if defined(BF561_FAMILY)
 681         int ret = 0;
 682         u32 sdbctl = bfin_read_EBIU_SDBCTL();
 683         ret += EBSZ_TO_MEG(sdbctl >>  0);
 684         ret += EBSZ_TO_MEG(sdbctl >>  8);
 685         ret += EBSZ_TO_MEG(sdbctl >> 16);
 686         ret += EBSZ_TO_MEG(sdbctl >> 24);
 687         return ret;
 688 # else
 689         return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
 690 # endif
 691 #elif defined(EBIU_DDRCTL1)
 692         u32 ddrctl = bfin_read_EBIU_DDRCTL1();
 693         int ret = 0;
 694         switch (ddrctl & 0xc0000) {
 695                 case DEVSZ_64:  ret = 64 / 8;
 696                 case DEVSZ_128: ret = 128 / 8;
 697                 case DEVSZ_256: ret = 256 / 8;
 698                 case DEVSZ_512: ret = 512 / 8;
 699         }
 700         switch (ddrctl & 0x30000) {
 701                 case DEVWD_4:  ret *= 2;
 702                 case DEVWD_8:  ret *= 2;
 703                 case DEVWD_16: break;
 704         }
 705         if ((ddrctl & 0xc000) == 0x4000)
 706                 ret *= 2;
 707         return ret;
 708 #endif
 709         BUG();
 710 }
 711
 712 void __init setup_arch(char **cmdline_p)
 713 {
 714         unsigned long sclk, cclk;
 715
 716 #ifdef CONFIG_DUMMY_CONSOLE
 717         conswitchp = &dummy_con;
 718 #endif
 719
 720 #if defined(CONFIG_CMDLINE_BOOL)
 721         strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
 722         command_line[sizeof(command_line) - 1] = 0;
 723 #endif
 724
 725         /* Keep a copy of command line */
 726         *cmdline_p = &command_line[0];
 727         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 728         boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 729
 730         /* setup memory defaults from the user config */
 731         physical_mem_end = 0;
 732         _ramend = get_mem_size() * 1024 * 1024;
 733
 734         memset(&bfin_memmap, 0, sizeof(bfin_memmap));
 735
 736         parse_cmdline_early(&command_line[0]);
 737
 738         if (physical_mem_end == 0)
 739                 physical_mem_end = _ramend;
 740
 741         memory_setup();
 742
 743         /* Initialize Async memory banks */
 744         bfin_write_EBIU_AMBCTL0(AMBCTL0VAL);
 745         bfin_write_EBIU_AMBCTL1(AMBCTL1VAL);
 746         bfin_write_EBIU_AMGCTL(AMGCTLVAL);
 747 #ifdef CONFIG_EBIU_MBSCTLVAL
 748         bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTLVAL);
 749         bfin_write_EBIU_MODE(CONFIG_EBIU_MODEVAL);
 750         bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTLVAL);
 751 #endif
 752
 753         cclk = get_cclk();
 754         sclk = get_sclk();
 755
 756 #if !defined(CONFIG_BFIN_KERNEL_CLOCK)
 757         if (ANOMALY_05000273 && cclk == sclk)
 758                 panic("ANOMALY 05000273, SCLK can not be same as CCLK");
 759 #endif
 760
 761 #ifdef BF561_FAMILY
 762         if (ANOMALY_05000266) {
 763                 bfin_read_IMDMA_D0_IRQ_STATUS();
 764                 bfin_read_IMDMA_D1_IRQ_STATUS();
 765         }
 766 #endif
 767         printk(KERN_INFO "Hardware Trace ");
 768         if (bfin_read_TBUFCTL() & 0x1)
 769                 printk("Active ");
 770         else
 771                 printk("Off ");
 772         if (bfin_read_TBUFCTL() & 0x2)
 773                 printk("and Enabled\n");
 774         else
 775         printk("and Disabled\n");
 776
 777 #if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
 778         /* we need to initialize the Flashrom device here since we might
 779          * do things with flash early on in the boot
 780          */
 781         flash_probe();
 782 #endif
 783
 784         _bfin_swrst = bfin_read_SWRST();
 785
 786 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 787         bfin_write_SWRST(_bfin_swrst & ~DOUBLE_FAULT);
 788 #endif
 789 #ifdef CONFIG_DEBUG_DOUBLEFAULT_RESET
 790         bfin_write_SWRST(_bfin_swrst | DOUBLE_FAULT);
 791 #endif
 792
 793         if (_bfin_swrst & RESET_DOUBLE) {
 794                 printk(KERN_EMERG "Recovering from DOUBLE FAULT event\n");
 795 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 796                 /* We assume the crashing kernel, and the current symbol table match */
 797                 printk(KERN_EMERG " While handling exception (EXCAUSE = 0x%x) at %pF\n",
 798                         (int)init_saved_seqstat & SEQSTAT_EXCAUSE, init_saved_retx);
 799                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr);
 800                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr);
 801 #endif
 802                 printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
 803                         init_retx);
 804         } else if (_bfin_swrst & RESET_WDOG)
 805                 printk(KERN_INFO "Recovering from Watchdog event\n");
 806         else if (_bfin_swrst & RESET_SOFTWARE)
 807                 printk(KERN_NOTICE "Reset caused by Software reset\n");
 808
 809         printk(KERN_INFO "Blackfin support (C) 2004-2008 Analog Devices, Inc.\n");
 810         if (bfin_compiled_revid() == 0xffff)
 811                 printk(KERN_INFO "Compiled for ADSP-%s Rev any\n", CPU);
 812         else if (bfin_compiled_revid() == -1)
 813                 printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
 814         else
 815                 printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
 816         if (bfin_revid() != bfin_compiled_revid()) {
 817                 if (bfin_compiled_revid() == -1)
 818                         printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
 819                                bfin_revid());
 820                 else if (bfin_compiled_revid() != 0xffff)
 821                         printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
 822                                bfin_compiled_revid(), bfin_revid());
 823         }
 824         if (bfin_revid() <= CONFIG_BF_REV_MIN || bfin_revid() > CONFIG_BF_REV_MAX)
 825                 printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
 826                        CPU, bfin_revid());
 827
 828         printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
 829
 830         printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
 831                cclk / 1000000,  sclk / 1000000);
 832
 833         if (ANOMALY_05000273 && (cclk >> 1) <= sclk)
 834                 printk("\n\n\nANOMALY_05000273: CCLK must be >= 2*SCLK !!!\n\n\n");
 835
 836         setup_bootmem_allocator();
 837
 838         paging_init();
 839
 840         /* Copy atomic sequences to their fixed location, and sanity check that
 841            these locations are the ones that we advertise to userspace.  */
 842         memcpy((void *)FIXED_CODE_START, &fixed_code_start,
 843                FIXED_CODE_END - FIXED_CODE_START);
 844         BUG_ON((char *)&sigreturn_stub - (char *)&fixed_code_start
 845                != SIGRETURN_STUB - FIXED_CODE_START);
 846         BUG_ON((char *)&atomic_xchg32 - (char *)&fixed_code_start
 847                != ATOMIC_XCHG32 - FIXED_CODE_START);
 848         BUG_ON((char *)&atomic_cas32 - (char *)&fixed_code_start
 849                != ATOMIC_CAS32 - FIXED_CODE_START);
 850         BUG_ON((char *)&atomic_add32 - (char *)&fixed_code_start
 851                != ATOMIC_ADD32 - FIXED_CODE_START);
 852         BUG_ON((char *)&atomic_sub32 - (char *)&fixed_code_start
 853                != ATOMIC_SUB32 - FIXED_CODE_START);
 854         BUG_ON((char *)&atomic_ior32 - (char *)&fixed_code_start
 855                != ATOMIC_IOR32 - FIXED_CODE_START);
 856         BUG_ON((char *)&atomic_and32 - (char *)&fixed_code_start
 857                != ATOMIC_AND32 - FIXED_CODE_START);
 858         BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start
 859                != ATOMIC_XOR32 - FIXED_CODE_START);
 860         BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start
 861                 != SAFE_USER_INSTRUCTION - FIXED_CODE_START);
 862
 863         init_exception_vectors();
 864         bfin_cache_init();
 865 }
 866
 867 static int __init topology_init(void)
 868 {
 869         int cpu;
 870
 871         for_each_possible_cpu(cpu) {
 872                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 873
 874                 register_cpu(c, cpu);
 875         }
 876
 877         return 0;
 878 }
 879
 880 subsys_initcall(topology_init);
 881
 882 /* Get the voltage input multiplier */
 883 static u_long cached_vco_pll_ctl, cached_vco;
 884 static u_long get_vco(void)
 885 {
 886         u_long msel;
 887
 888         u_long pll_ctl = bfin_read_PLL_CTL();
 889         if (pll_ctl == cached_vco_pll_ctl)
 890                 return cached_vco;
 891         else
 892                 cached_vco_pll_ctl = pll_ctl;
 893
 894         msel = (pll_ctl >> 9) & 0x3F;
 895         if (0 == msel)
 896                 msel = 64;
 897
 898         cached_vco = CONFIG_CLKIN_HZ;
 899         cached_vco >>= (1 & pll_ctl);   /* DF bit */
 900         cached_vco *= msel;
 901         return cached_vco;
 902 }
 903
 904 /* Get the Core clock */
 905 static u_long cached_cclk_pll_div, cached_cclk;
 906 u_long get_cclk(void)
 907 {
 908         u_long csel, ssel;
 909
 910         if (bfin_read_PLL_STAT() & 0x1)
 911                 return CONFIG_CLKIN_HZ;
 912
 913         ssel = bfin_read_PLL_DIV();
 914         if (ssel == cached_cclk_pll_div)
 915                 return cached_cclk;
 916         else
 917                 cached_cclk_pll_div = ssel;
 918
 919         csel = ((ssel >> 4) & 0x03);
 920         ssel &= 0xf;
 921         if (ssel && ssel < (1 << csel)) /* SCLK > CCLK */
 922                 cached_cclk = get_vco() / ssel;
 923         else
 924                 cached_cclk = get_vco() >> csel;
 925         return cached_cclk;
 926 }
 927 EXPORT_SYMBOL(get_cclk);
 928
 929 /* Get the System clock */
 930 static u_long cached_sclk_pll_div, cached_sclk;
 931 u_long get_sclk(void)
 932 {
 933         u_long ssel;
 934
 935         if (bfin_read_PLL_STAT() & 0x1)
 936                 return CONFIG_CLKIN_HZ;
 937
 938         ssel = bfin_read_PLL_DIV();
 939         if (ssel == cached_sclk_pll_div)
 940                 return cached_sclk;
 941         else
 942                 cached_sclk_pll_div = ssel;
 943
 944         ssel &= 0xf;
 945         if (0 == ssel) {
 946                 printk(KERN_WARNING "Invalid System Clock\n");
 947                 ssel = 1;
 948         }
 949
 950         cached_sclk = get_vco() / ssel;
 951         return cached_sclk;
 952 }
 953 EXPORT_SYMBOL(get_sclk);
 954
 955 unsigned long sclk_to_usecs(unsigned long sclk)
 956 {
 957         u64 tmp = USEC_PER_SEC * (u64)sclk;
 958         do_div(tmp, get_sclk());
 959         return tmp;
 960 }
 961 EXPORT_SYMBOL(sclk_to_usecs);
 962
 963 unsigned long usecs_to_sclk(unsigned long usecs)
 964 {
 965         u64 tmp = get_sclk() * (u64)usecs;
 966         do_div(tmp, USEC_PER_SEC);
 967         return tmp;
 968 }
 969 EXPORT_SYMBOL(usecs_to_sclk);
 970
 971 /*
 972  *      Get CPU information for use by the procfs.
 973  */
 974 static int show_cpuinfo(struct seq_file *m, void *v)
 975 {
 976         char *cpu, *mmu, *fpu, *vendor, *cache;
 977         uint32_t revid;
 978
 979         u_long cclk = 0, sclk = 0;
 980         u_int icache_size = BFIN_ICACHESIZE / 1024, dcache_size = 0, dsup_banks = 0;
 981
 982         cpu = CPU;
 983         mmu = "none";
 984         fpu = "none";
 985         revid = bfin_revid();
 986
 987         cclk = get_cclk();
 988         sclk = get_sclk();
 989
 990         switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE) {
 991         case 0xca:
 992                 vendor = "Analog Devices";
 993                 break;
 994         default:
 995                 vendor = "unknown";
 996                 break;
 997         }
 998
 999         seq_printf(m, "processor\t: %d\n"
1000                 "vendor_id\t: %s\n"
1001                 "cpu family\t: 0x%x\n"
1002                 "model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n"
1003                 "stepping\t: %d\n",
1004                 *(unsigned int *)v,
1005                 vendor,
1006                 (bfin_read_CHIPID() & CHIPID_FAMILY),
1007                 cpu, cclk/1000000, sclk/1000000,
1008 #ifdef CONFIG_MPU
1009                 "mpu on",
1010 #else
1011                 "mpu off",
1012 #endif
1013                 revid);
1014
1015         seq_printf(m, "cpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
1016                 cclk/1000000, cclk%1000000,
1017                 sclk/1000000, sclk%1000000);
1018         seq_printf(m, "bogomips\t: %lu.%02lu\n"
1019                 "Calibration\t: %lu loops\n",
1020                 (loops_per_jiffy * HZ) / 500000,
1021                 ((loops_per_jiffy * HZ) / 5000) % 100,
1022                 (loops_per_jiffy * HZ));
1023
1024         /* Check Cache configutation */
1025         switch (bfin_read_DMEM_CONTROL() & (1 << DMC0_P | 1 << DMC1_P)) {
1026         case ACACHE_BSRAM:
1027                 cache = "dbank-A/B\t: cache/sram";
1028                 dcache_size = 16;
1029                 dsup_banks = 1;
1030                 break;
1031         case ACACHE_BCACHE:
1032                 cache = "dbank-A/B\t: cache/cache";
1033                 dcache_size = 32;
1034                 dsup_banks = 2;
1035                 break;
1036         case ASRAM_BSRAM:
1037                 cache = "dbank-A/B\t: sram/sram";
1038                 dcache_size = 0;
1039                 dsup_banks = 0;
1040                 break;
1041         default:
1042                 cache = "unknown";
1043                 dcache_size = 0;
1044                 dsup_banks = 0;
1045                 break;
1046         }
1047
1048         /* Is it turned on? */
1049         if ((bfin_read_DMEM_CONTROL() & (ENDCPLB | DMC_ENABLE)) != (ENDCPLB | DMC_ENABLE))
1050                 dcache_size = 0;
1051
1052         if ((bfin_read_IMEM_CONTROL() & (IMC | ENICPLB)) != (IMC | ENICPLB))
1053                 icache_size = 0;
1054
1055         seq_printf(m, "cache size\t: %d KB(L1 icache) "
1056                 "%d KB(L1 dcache-%s) %d KB(L2 cache)\n",
1057                 icache_size, dcache_size,
1058 #if defined CONFIG_BFIN_WB
1059                 "wb"
1060 #elif defined CONFIG_BFIN_WT
1061                 "wt"
1062 #endif
1063                 "", 0);
1064
1065         seq_printf(m, "%s\n", cache);
1066
1067         if (icache_size)
1068                 seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
1069                            BFIN_ISUBBANKS, BFIN_IWAYS, BFIN_ILINES);
1070         else
1071                 seq_printf(m, "icache setup\t: off\n");
1072
1073         seq_printf(m,
1074                    "dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
1075                    dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
1076                    BFIN_DLINES);
1077 #ifdef CONFIG_BFIN_ICACHE_LOCK
1078         switch ((bfin_read_IMEM_CONTROL() >> 3) & WAYALL_L) {
1079         case WAY0_L:
1080                 seq_printf(m, "Way0 Locked-Down\n");
1081                 break;
1082         case WAY1_L:
1083                 seq_printf(m, "Way1 Locked-Down\n");
1084                 break;
1085         case WAY01_L:
1086                 seq_printf(m, "Way0,Way1 Locked-Down\n");
1087                 break;
1088         case WAY2_L:
1089                 seq_printf(m, "Way2 Locked-Down\n");
1090                 break;
1091         case WAY02_L:
1092                 seq_printf(m, "Way0,Way2 Locked-Down\n");
1093                 break;
1094         case WAY12_L:
1095                 seq_printf(m, "Way1,Way2 Locked-Down\n");
1096                 break;
1097         case WAY012_L:
1098                 seq_printf(m, "Way0,Way1 & Way2 Locked-Down\n");
1099                 break;
1100         case WAY3_L:
1101                 seq_printf(m, "Way3 Locked-Down\n");
1102                 break;
1103         case WAY03_L:
1104                 seq_printf(m, "Way0,Way3 Locked-Down\n");
1105                 break;
1106         case WAY13_L:
1107                 seq_printf(m, "Way1,Way3 Locked-Down\n");
1108                 break;
1109         case WAY013_L:
1110                 seq_printf(m, "Way 0,Way1,Way3 Locked-Down\n");
1111                 break;
1112         case WAY32_L:
1113                 seq_printf(m, "Way3,Way2 Locked-Down\n");
1114                 break;
1115         case WAY320_L:
1116                 seq_printf(m, "Way3,Way2,Way0 Locked-Down\n");
1117                 break;
1118         case WAY321_L:
1119                 seq_printf(m, "Way3,Way2,Way1 Locked-Down\n");
1120                 break;
1121         case WAYALL_L:
1122                 seq_printf(m, "All Ways are locked\n");
1123                 break;
1124         default:
1125                 seq_printf(m, "No Ways are locked\n");
1126         }
1127 #endif
1128         seq_printf(m, "board name\t: %s\n", bfin_board_name);
1129         seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
1130                  physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);
1131         seq_printf(m, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
1132                 ((int)memory_end - (int)_stext) >> 10,
1133                 _stext,
1134                 (void *)memory_end);
1135
1136         return 0;
1137 }
1138
1139 static void *c_start(struct seq_file *m, loff_t *pos)
1140 {
1141         if (*pos == 0)
1142                 *pos = first_cpu(cpu_online_map);
1143         if (*pos >= num_online_cpus())
1144                 return NULL;
1145
1146         return pos;
1147 }
1148
1149 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1150 {
1151         *pos = next_cpu(*pos, cpu_online_map);
1152
1153         return c_start(m, pos);
1154 }
1155
1156 static void c_stop(struct seq_file *m, void *v)
1157 {
1158 }
1159
1160 const struct seq_operations cpuinfo_op = {
1161         .start = c_start,
1162         .next = c_next,
1163         .stop = c_stop,
1164         .show = show_cpuinfo,
1165 };
1166
1167 void __init cmdline_init(const char *r0)
1168 {
1169         if (r0)
1170                 strncpy(command_line, r0, COMMAND_LINE_SIZE);
1171 }