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   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 EXPORT_SYMBOL(reserved_mem_dcache_on);
  46
  47 #ifdef CONFIG_MTD_UCLINUX
  48 unsigned long memory_mtd_end, memory_mtd_start, mtd_size;
  49 unsigned long _ebss;
  50 EXPORT_SYMBOL(memory_mtd_end);
  51 EXPORT_SYMBOL(memory_mtd_start);
  52 EXPORT_SYMBOL(mtd_size);
  53 #endif
  54
  55 char __initdata command_line[COMMAND_LINE_SIZE];
  56 void __initdata *init_retx, *init_saved_retx, *init_saved_seqstat,
  57         *init_saved_icplb_fault_addr, *init_saved_dcplb_fault_addr;
  58
  59 /* boot memmap, for parsing "memmap=" */
  60 #define BFIN_MEMMAP_MAX         128 /* number of entries in bfin_memmap */
  61 #define BFIN_MEMMAP_RAM         1
  62 #define BFIN_MEMMAP_RESERVED    2
  63 struct bfin_memmap {
  64         int nr_map;
  65         struct bfin_memmap_entry {
  66                 unsigned long long addr; /* start of memory segment */
  67                 unsigned long long size;
  68                 unsigned long type;
  69         } map[BFIN_MEMMAP_MAX];
  70 } bfin_memmap __initdata;
  71
  72 /* for memmap sanitization */
  73 struct change_member {
  74         struct bfin_memmap_entry *pentry; /* pointer to original entry */
  75         unsigned long long addr; /* address for this change point */
  76 };
  77 static struct change_member change_point_list[2*BFIN_MEMMAP_MAX] __initdata;
  78 static struct change_member *change_point[2*BFIN_MEMMAP_MAX] __initdata;
  79 static struct bfin_memmap_entry *overlap_list[BFIN_MEMMAP_MAX] __initdata;
  80 static struct bfin_memmap_entry new_map[BFIN_MEMMAP_MAX] __initdata;
  81
  82 void __init bfin_cache_init(void)
  83 {
  84 #if defined(CONFIG_BFIN_DCACHE) || defined(CONFIG_BFIN_ICACHE)
  85         generate_cplb_tables();
  86 #endif
  87
  88 #ifdef CONFIG_BFIN_ICACHE
  89         bfin_icache_init();
  90         printk(KERN_INFO "Instruction Cache Enabled\n");
  91 #endif
  92
  93 #ifdef CONFIG_BFIN_DCACHE
  94         bfin_dcache_init();
  95         printk(KERN_INFO "Data Cache Enabled"
  96 # if defined CONFIG_BFIN_WB
  97                 " (write-back)"
  98 # elif defined CONFIG_BFIN_WT
  99                 " (write-through)"
 100 # endif
 101                 "\n");
 102 #endif
 103 }
 104
 105 void __init bfin_relocate_l1_mem(void)
 106 {
 107         unsigned long l1_code_length;
 108         unsigned long l1_data_a_length;
 109         unsigned long l1_data_b_length;
 110         unsigned long l2_length;
 111
 112         l1_code_length = _etext_l1 - _stext_l1;
 113         if (l1_code_length > L1_CODE_LENGTH)
 114                 panic("L1 Instruction SRAM Overflow\n");
 115         /* cannot complain as printk is not available as yet.
 116          * But we can continue booting and complain later!
 117          */
 118
 119         /* Copy _stext_l1 to _etext_l1 to L1 instruction SRAM */
 120         dma_memcpy(_stext_l1, _l1_lma_start, l1_code_length);
 121
 122         l1_data_a_length = _ebss_l1 - _sdata_l1;
 123         if (l1_data_a_length > L1_DATA_A_LENGTH)
 124                 panic("L1 Data SRAM Bank A Overflow\n");
 125
 126         /* Copy _sdata_l1 to _ebss_l1 to L1 data bank A SRAM */
 127         dma_memcpy(_sdata_l1, _l1_lma_start + l1_code_length, l1_data_a_length);
 128
 129         l1_data_b_length = _ebss_b_l1 - _sdata_b_l1;
 130         if (l1_data_b_length > L1_DATA_B_LENGTH)
 131                 panic("L1 Data SRAM Bank B Overflow\n");
 132
 133         /* Copy _sdata_b_l1 to _ebss_b_l1 to L1 data bank B SRAM */
 134         dma_memcpy(_sdata_b_l1, _l1_lma_start + l1_code_length +
 135                         l1_data_a_length, l1_data_b_length);
 136
 137         if (L2_LENGTH != 0) {
 138                 l2_length = _ebss_l2 - _stext_l2;
 139                 if (l2_length > L2_LENGTH)
 140                         panic("L2 SRAM Overflow\n");
 141
 142                 /* Copy _stext_l2 to _edata_l2 to L2 SRAM */
 143                 dma_memcpy(_stext_l2, _l2_lma_start, l2_length);
 144         }
 145 }
 146
 147 /* add_memory_region to memmap */
 148 static void __init add_memory_region(unsigned long long start,
 149                               unsigned long long size, int type)
 150 {
 151         int i;
 152
 153         i = bfin_memmap.nr_map;
 154
 155         if (i == BFIN_MEMMAP_MAX) {
 156                 printk(KERN_ERR "Ooops! Too many entries in the memory map!\n");
 157                 return;
 158         }
 159
 160         bfin_memmap.map[i].addr = start;
 161         bfin_memmap.map[i].size = size;
 162         bfin_memmap.map[i].type = type;
 163         bfin_memmap.nr_map++;
 164 }
 165
 166 /*
 167  * Sanitize the boot memmap, removing overlaps.
 168  */
 169 static int __init sanitize_memmap(struct bfin_memmap_entry *map, int *pnr_map)
 170 {
 171         struct change_member *change_tmp;
 172         unsigned long current_type, last_type;
 173         unsigned long long last_addr;
 174         int chgidx, still_changing;
 175         int overlap_entries;
 176         int new_entry;
 177         int old_nr, new_nr, chg_nr;
 178         int i;
 179
 180         /*
 181                 Visually we're performing the following (1,2,3,4 = memory types)
 182
 183                 Sample memory map (w/overlaps):
 184                    ____22__________________
 185                    ______________________4_
 186                    ____1111________________
 187                    _44_____________________
 188                    11111111________________
 189                    ____________________33__
 190                    ___________44___________
 191                    __________33333_________
 192                    ______________22________
 193                    ___________________2222_
 194                    _________111111111______
 195                    _____________________11_
 196                    _________________4______
 197
 198                 Sanitized equivalent (no overlap):
 199                    1_______________________
 200                    _44_____________________
 201                    ___1____________________
 202                    ____22__________________
 203                    ______11________________
 204                    _________1______________
 205                    __________3_____________
 206                    ___________44___________
 207                    _____________33_________
 208                    _______________2________
 209                    ________________1_______
 210                    _________________4______
 211                    ___________________2____
 212                    ____________________33__
 213                    ______________________4_
 214         */
 215         /* if there's only one memory region, don't bother */
 216         if (*pnr_map < 2)
 217                 return -1;
 218
 219         old_nr = *pnr_map;
 220
 221         /* bail out if we find any unreasonable addresses in memmap */
 222         for (i = 0; i < old_nr; i++)
 223                 if (map[i].addr + map[i].size < map[i].addr)
 224                         return -1;
 225
 226         /* create pointers for initial change-point information (for sorting) */
 227         for (i = 0; i < 2*old_nr; i++)
 228                 change_point[i] = &change_point_list[i];
 229
 230         /* record all known change-points (starting and ending addresses),
 231            omitting those that are for empty memory regions */
 232         chgidx = 0;
 233         for (i = 0; i < old_nr; i++)    {
 234                 if (map[i].size != 0) {
 235                         change_point[chgidx]->addr = map[i].addr;
 236                         change_point[chgidx++]->pentry = &map[i];
 237                         change_point[chgidx]->addr = map[i].addr + map[i].size;
 238                         change_point[chgidx++]->pentry = &map[i];
 239                 }
 240         }
 241         chg_nr = chgidx;        /* true number of change-points */
 242
 243         /* sort change-point list by memory addresses (low -> high) */
 244         still_changing = 1;
 245         while (still_changing)  {
 246                 still_changing = 0;
 247                 for (i = 1; i < chg_nr; i++)  {
 248                         /* if <current_addr> > <last_addr>, swap */
 249                         /* or, if current=<start_addr> & last=<end_addr>, swap */
 250                         if ((change_point[i]->addr < change_point[i-1]->addr) ||
 251                                 ((change_point[i]->addr == change_point[i-1]->addr) &&
 252                                  (change_point[i]->addr == change_point[i]->pentry->addr) &&
 253                                  (change_point[i-1]->addr != change_point[i-1]->pentry->addr))
 254                            ) {
 255                                 change_tmp = change_point[i];
 256                                 change_point[i] = change_point[i-1];
 257                                 change_point[i-1] = change_tmp;
 258                                 still_changing = 1;
 259                         }
 260                 }
 261         }
 262
 263         /* create a new memmap, removing overlaps */
 264         overlap_entries = 0;     /* number of entries in the overlap table */
 265         new_entry = 0;   /* index for creating new memmap entries */
 266         last_type = 0;           /* start with undefined memory type */
 267         last_addr = 0;           /* start with 0 as last starting address */
 268         /* loop through change-points, determining affect on the new memmap */
 269         for (chgidx = 0; chgidx < chg_nr; chgidx++) {
 270                 /* keep track of all overlapping memmap entries */
 271                 if (change_point[chgidx]->addr == change_point[chgidx]->pentry->addr) {
 272                         /* add map entry to overlap list (> 1 entry implies an overlap) */
 273                         overlap_list[overlap_entries++] = change_point[chgidx]->pentry;
 274                 } else {
 275                         /* remove entry from list (order independent, so swap with last) */
 276                         for (i = 0; i < overlap_entries; i++) {
 277                                 if (overlap_list[i] == change_point[chgidx]->pentry)
 278                                         overlap_list[i] = overlap_list[overlap_entries-1];
 279                         }
 280                         overlap_entries--;
 281                 }
 282                 /* if there are overlapping entries, decide which "type" to use */
 283                 /* (larger value takes precedence -- 1=usable, 2,3,4,4+=unusable) */
 284                 current_type = 0;
 285                 for (i = 0; i < overlap_entries; i++)
 286                         if (overlap_list[i]->type > current_type)
 287                                 current_type = overlap_list[i]->type;
 288                 /* continue building up new memmap based on this information */
 289                 if (current_type != last_type)  {
 290                         if (last_type != 0) {
 291                                 new_map[new_entry].size =
 292                                         change_point[chgidx]->addr - last_addr;
 293                                 /* move forward only if the new size was non-zero */
 294                                 if (new_map[new_entry].size != 0)
 295                                         if (++new_entry >= BFIN_MEMMAP_MAX)
 296                                                 break;  /* no more space left for new entries */
 297                         }
 298                         if (current_type != 0) {
 299                                 new_map[new_entry].addr = change_point[chgidx]->addr;
 300                                 new_map[new_entry].type = current_type;
 301                                 last_addr = change_point[chgidx]->addr;
 302                         }
 303                         last_type = current_type;
 304                 }
 305         }
 306         new_nr = new_entry;   /* retain count for new entries */
 307
 308         /* copy new  mapping into original location */
 309         memcpy(map, new_map, new_nr*sizeof(struct bfin_memmap_entry));
 310         *pnr_map = new_nr;
 311
 312         return 0;
 313 }
 314
 315 static void __init print_memory_map(char *who)
 316 {
 317         int i;
 318
 319         for (i = 0; i < bfin_memmap.nr_map; i++) {
 320                 printk(KERN_DEBUG " %s: %016Lx - %016Lx ", who,
 321                         bfin_memmap.map[i].addr,
 322                         bfin_memmap.map[i].addr + bfin_memmap.map[i].size);
 323                 switch (bfin_memmap.map[i].type) {
 324                 case BFIN_MEMMAP_RAM:
 325                                 printk("(usable)\n");
 326                                 break;
 327                 case BFIN_MEMMAP_RESERVED:
 328                                 printk("(reserved)\n");
 329                                 break;
 330                 default:        printk("type %lu\n", bfin_memmap.map[i].type);
 331                                 break;
 332                 }
 333         }
 334 }
 335
 336 static __init int parse_memmap(char *arg)
 337 {
 338         unsigned long long start_at, mem_size;
 339
 340         if (!arg)
 341                 return -EINVAL;
 342
 343         mem_size = memparse(arg, &arg);
 344         if (*arg == '@') {
 345                 start_at = memparse(arg+1, &arg);
 346                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RAM);
 347         } else if (*arg == '$') {
 348                 start_at = memparse(arg+1, &arg);
 349                 add_memory_region(start_at, mem_size, BFIN_MEMMAP_RESERVED);
 350         }
 351
 352         return 0;
 353 }
 354
 355 /*
 356  * Initial parsing of the command line.  Currently, we support:
 357  *  - Controlling the linux memory size: mem=xxx[KMG]
 358  *  - Controlling the physical memory size: max_mem=xxx[KMG][$][#]
 359  *       $ -> reserved memory is dcacheable
 360  *       # -> reserved memory is icacheable
 361  *  - "memmap=XXX[KkmM][@][$]XXX[KkmM]" defines a memory region
 362  *       @ from <start> to <start>+<mem>, type RAM
 363  *       $ from <start> to <start>+<mem>, type RESERVED
 364  *
 365  */
 366 static __init void parse_cmdline_early(char *cmdline_p)
 367 {
 368         char c = ' ', *to = cmdline_p;
 369         unsigned int memsize;
 370         for (;;) {
 371                 if (c == ' ') {
 372                         if (!memcmp(to, "mem=", 4)) {
 373                                 to += 4;
 374                                 memsize = memparse(to, &to);
 375                                 if (memsize)
 376                                         _ramend = memsize;
 377
 378                         } else if (!memcmp(to, "max_mem=", 8)) {
 379                                 to += 8;
 380                                 memsize = memparse(to, &to);
 381                                 if (memsize) {
 382                                         physical_mem_end = memsize;
 383                                         if (*to != ' ') {
 384                                                 if (*to == '$'
 385                                                     || *(to + 1) == '$')
 386                                                         reserved_mem_dcache_on =
 387                                                             1;
 388                                                 if (*to == '#'
 389                                                     || *(to + 1) == '#')
 390                                                         reserved_mem_icache_on =
 391                                                             1;
 392                                         }
 393                                 }
 394                         } else if (!memcmp(to, "earlyprintk=", 12)) {
 395                                 to += 12;
 396                                 setup_early_printk(to);
 397                         } else if (!memcmp(to, "memmap=", 7)) {
 398                                 to += 7;
 399                                 parse_memmap(to);
 400                         }
 401                 }
 402                 c = *(to++);
 403                 if (!c)
 404                         break;
 405         }
 406 }
 407
 408 /*
 409  * Setup memory defaults from user config.
 410  * The physical memory layout looks like:
 411  *
 412  *  [_rambase, _ramstart]:              kernel image
 413  *  [memory_start, memory_end]:         dynamic memory managed by kernel
 414  *  [memory_end, _ramend]:              reserved memory
 415  *      [memory_mtd_start(memory_end),
 416  *              memory_mtd_start + mtd_size]:   rootfs (if any)
 417  *      [_ramend - DMA_UNCACHED_REGION,
 418  *              _ramend]:                       uncached DMA region
 419  *  [_ramend, physical_mem_end]:        memory not managed by kernel
 420  *
 421  */
 422 static __init void  memory_setup(void)
 423 {
 424 #ifdef CONFIG_MTD_UCLINUX
 425         unsigned long mtd_phys = 0;
 426 #endif
 427
 428         _rambase = (unsigned long)_stext;
 429         _ramstart = (unsigned long)_end;
 430
 431         if (DMA_UNCACHED_REGION > (_ramend - _ramstart)) {
 432                 console_init();
 433                 panic("DMA region exceeds memory limit: %lu.\n",
 434                         _ramend - _ramstart);
 435         }
 436         memory_end = _ramend - DMA_UNCACHED_REGION;
 437
 438 #ifdef CONFIG_MPU
 439         /* Round up to multiple of 4MB.  */
 440         memory_start = (_ramstart + 0x3fffff) & ~0x3fffff;
 441 #else
 442         memory_start = PAGE_ALIGN(_ramstart);
 443 #endif
 444
 445 #if defined(CONFIG_MTD_UCLINUX)
 446         /* generic memory mapped MTD driver */
 447         memory_mtd_end = memory_end;
 448
 449         mtd_phys = _ramstart;
 450         mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 8)));
 451
 452 # if defined(CONFIG_EXT2_FS) || defined(CONFIG_EXT3_FS)
 453         if (*((unsigned short *)(mtd_phys + 0x438)) == EXT2_SUPER_MAGIC)
 454                 mtd_size =
 455                     PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x404)) << 10);
 456 # endif
 457
 458 # if defined(CONFIG_CRAMFS)
 459         if (*((unsigned long *)(mtd_phys)) == CRAMFS_MAGIC)
 460                 mtd_size = PAGE_ALIGN(*((unsigned long *)(mtd_phys + 0x4)));
 461 # endif
 462
 463 # if defined(CONFIG_ROMFS_FS)
 464         if (((unsigned long *)mtd_phys)[0] == ROMSB_WORD0
 465             && ((unsigned long *)mtd_phys)[1] == ROMSB_WORD1)
 466                 mtd_size =
 467                     PAGE_ALIGN(be32_to_cpu(((unsigned long *)mtd_phys)[2]));
 468 #  if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
 469         /* Due to a Hardware Anomaly we need to limit the size of usable
 470          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 471          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 472          */
 473 #   if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 474         if (memory_end >= 56 * 1024 * 1024)
 475                 memory_end = 56 * 1024 * 1024;
 476 #   else
 477         if (memory_end >= 60 * 1024 * 1024)
 478                 memory_end = 60 * 1024 * 1024;
 479 #   endif                               /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 480 #  endif                                /* ANOMALY_05000263 */
 481 # endif                         /* CONFIG_ROMFS_FS */
 482
 483         memory_end -= mtd_size;
 484
 485         if (mtd_size == 0) {
 486                 console_init();
 487                 panic("Don't boot kernel without rootfs attached.\n");
 488         }
 489
 490         /* Relocate MTD image to the top of memory after the uncached memory area */
 491         dma_memcpy((char *)memory_end, _end, mtd_size);
 492
 493         memory_mtd_start = memory_end;
 494         _ebss = memory_mtd_start;       /* define _ebss for compatible */
 495 #endif                          /* CONFIG_MTD_UCLINUX */
 496
 497 #if (defined(CONFIG_BFIN_ICACHE) && ANOMALY_05000263)
 498         /* Due to a Hardware Anomaly we need to limit the size of usable
 499          * instruction memory to max 60MB, 56 if HUNT_FOR_ZERO is on
 500          * 05000263 - Hardware loop corrupted when taking an ICPLB exception
 501          */
 502 #if (defined(CONFIG_DEBUG_HUNT_FOR_ZERO))
 503         if (memory_end >= 56 * 1024 * 1024)
 504                 memory_end = 56 * 1024 * 1024;
 505 #else
 506         if (memory_end >= 60 * 1024 * 1024)
 507                 memory_end = 60 * 1024 * 1024;
 508 #endif                          /* CONFIG_DEBUG_HUNT_FOR_ZERO */
 509         printk(KERN_NOTICE "Warning: limiting memory to %liMB due to hardware anomaly 05000263\n", memory_end >> 20);
 510 #endif                          /* ANOMALY_05000263 */
 511
 512 #ifdef CONFIG_MPU
 513         page_mask_nelts = ((_ramend >> PAGE_SHIFT) + 31) / 32;
 514         page_mask_order = get_order(3 * page_mask_nelts * sizeof(long));
 515 #endif
 516
 517 #if !defined(CONFIG_MTD_UCLINUX)
 518         /*In case there is no valid CPLB behind memory_end make sure we don't get to close*/
 519         memory_end -= SIZE_4K;
 520 #endif
 521
 522         init_mm.start_code = (unsigned long)_stext;
 523         init_mm.end_code = (unsigned long)_etext;
 524         init_mm.end_data = (unsigned long)_edata;
 525         init_mm.brk = (unsigned long)0;
 526
 527         printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
 528         printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
 529
 530         printk(KERN_INFO "Memory map:\n"
 531                 KERN_INFO "  fixedcode = 0x%p-0x%p\n"
 532                 KERN_INFO "  text      = 0x%p-0x%p\n"
 533                 KERN_INFO "  rodata    = 0x%p-0x%p\n"
 534                 KERN_INFO "  bss       = 0x%p-0x%p\n"
 535                 KERN_INFO "  data      = 0x%p-0x%p\n"
 536                 KERN_INFO "    stack   = 0x%p-0x%p\n"
 537                 KERN_INFO "  init      = 0x%p-0x%p\n"
 538                 KERN_INFO "  available = 0x%p-0x%p\n"
 539 #ifdef CONFIG_MTD_UCLINUX
 540                 KERN_INFO "  rootfs    = 0x%p-0x%p\n"
 541 #endif
 542 #if DMA_UNCACHED_REGION > 0
 543                 KERN_INFO "  DMA Zone  = 0x%p-0x%p\n"
 544 #endif
 545                 , (void *)FIXED_CODE_START, (void *)FIXED_CODE_END,
 546                 _stext, _etext,
 547                 __start_rodata, __end_rodata,
 548                 __bss_start, __bss_stop,
 549                 _sdata, _edata,
 550                 (void *)&init_thread_union,
 551                 (void *)((int)(&init_thread_union) + 0x2000),
 552                 __init_begin, __init_end,
 553                 (void *)_ramstart, (void *)memory_end
 554 #ifdef CONFIG_MTD_UCLINUX
 555                 , (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
 556 #endif
 557 #if DMA_UNCACHED_REGION > 0
 558                 , (void *)(_ramend - DMA_UNCACHED_REGION), (void *)(_ramend)
 559 #endif
 560                 );
 561 }
 562
 563 /*
 564  * Find the lowest, highest page frame number we have available
 565  */
 566 void __init find_min_max_pfn(void)
 567 {
 568         int i;
 569
 570         max_pfn = 0;
 571         min_low_pfn = memory_end;
 572
 573         for (i = 0; i < bfin_memmap.nr_map; i++) {
 574                 unsigned long start, end;
 575                 /* RAM? */
 576                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 577                         continue;
 578                 start = PFN_UP(bfin_memmap.map[i].addr);
 579                 end = PFN_DOWN(bfin_memmap.map[i].addr +
 580                                 bfin_memmap.map[i].size);
 581                 if (start >= end)
 582                         continue;
 583                 if (end > max_pfn)
 584                         max_pfn = end;
 585                 if (start < min_low_pfn)
 586                         min_low_pfn = start;
 587         }
 588 }
 589
 590 static __init void setup_bootmem_allocator(void)
 591 {
 592         int bootmap_size;
 593         int i;
 594         unsigned long start_pfn, end_pfn;
 595         unsigned long curr_pfn, last_pfn, size;
 596
 597         /* mark memory between memory_start and memory_end usable */
 598         add_memory_region(memory_start,
 599                 memory_end - memory_start, BFIN_MEMMAP_RAM);
 600         /* sanity check for overlap */
 601         sanitize_memmap(bfin_memmap.map, &bfin_memmap.nr_map);
 602         print_memory_map("boot memmap");
 603
 604         /* intialize globals in linux/bootmem.h */
 605         find_min_max_pfn();
 606         /* pfn of the last usable page frame */
 607         if (max_pfn > memory_end >> PAGE_SHIFT)
 608                 max_pfn = memory_end >> PAGE_SHIFT;
 609         /* pfn of last page frame directly mapped by kernel */
 610         max_low_pfn = max_pfn;
 611         /* pfn of the first usable page frame after kernel image*/
 612         if (min_low_pfn < memory_start >> PAGE_SHIFT)
 613                 min_low_pfn = memory_start >> PAGE_SHIFT;
 614
 615         start_pfn = PAGE_OFFSET >> PAGE_SHIFT;
 616         end_pfn = memory_end >> PAGE_SHIFT;
 617
 618         /*
 619          * give all the memory to the bootmap allocator,  tell it to put the
 620          * boot mem_map at the start of memory.
 621          */
 622         bootmap_size = init_bootmem_node(NODE_DATA(0),
 623                         memory_start >> PAGE_SHIFT,     /* map goes here */
 624                         start_pfn, end_pfn);
 625
 626         /* register the memmap regions with the bootmem allocator */
 627         for (i = 0; i < bfin_memmap.nr_map; i++) {
 628                 /*
 629                  * Reserve usable memory
 630                  */
 631                 if (bfin_memmap.map[i].type != BFIN_MEMMAP_RAM)
 632                         continue;
 633                 /*
 634                  * We are rounding up the start address of usable memory:
 635                  */
 636                 curr_pfn = PFN_UP(bfin_memmap.map[i].addr);
 637                 if (curr_pfn >= end_pfn)
 638                         continue;
 639                 /*
 640                  * ... and at the end of the usable range downwards:
 641                  */
 642                 last_pfn = PFN_DOWN(bfin_memmap.map[i].addr +
 643                                          bfin_memmap.map[i].size);
 644
 645                 if (last_pfn > end_pfn)
 646                         last_pfn = end_pfn;
 647
 648                 /*
 649                  * .. finally, did all the rounding and playing
 650                  * around just make the area go away?
 651                  */
 652                 if (last_pfn <= curr_pfn)
 653                         continue;
 654
 655                 size = last_pfn - curr_pfn;
 656                 free_bootmem(PFN_PHYS(curr_pfn), PFN_PHYS(size));
 657         }
 658
 659         /* reserve memory before memory_start, including bootmap */
 660         reserve_bootmem(PAGE_OFFSET,
 661                 memory_start + bootmap_size + PAGE_SIZE - 1 - PAGE_OFFSET,
 662                 BOOTMEM_DEFAULT);
 663 }
 664
 665 #define EBSZ_TO_MEG(ebsz) \
 666 ({ \
 667         int meg = 0; \
 668         switch (ebsz & 0xf) { \
 669                 case 0x1: meg =  16; break; \
 670                 case 0x3: meg =  32; break; \
 671                 case 0x5: meg =  64; break; \
 672                 case 0x7: meg = 128; break; \
 673                 case 0x9: meg = 256; break; \
 674                 case 0xb: meg = 512; break; \
 675         } \
 676         meg; \
 677 })
 678 static inline int __init get_mem_size(void)
 679 {
 680 #if defined(EBIU_SDBCTL)
 681 # if defined(BF561_FAMILY)
 682         int ret = 0;
 683         u32 sdbctl = bfin_read_EBIU_SDBCTL();
 684         ret += EBSZ_TO_MEG(sdbctl >>  0);
 685         ret += EBSZ_TO_MEG(sdbctl >>  8);
 686         ret += EBSZ_TO_MEG(sdbctl >> 16);
 687         ret += EBSZ_TO_MEG(sdbctl >> 24);
 688         return ret;
 689 # else
 690         return EBSZ_TO_MEG(bfin_read_EBIU_SDBCTL());
 691 # endif
 692 #elif defined(EBIU_DDRCTL1)
 693         u32 ddrctl = bfin_read_EBIU_DDRCTL1();
 694         int ret = 0;
 695         switch (ddrctl & 0xc0000) {
 696                 case DEVSZ_64:  ret = 64 / 8;
 697                 case DEVSZ_128: ret = 128 / 8;
 698                 case DEVSZ_256: ret = 256 / 8;
 699                 case DEVSZ_512: ret = 512 / 8;
 700         }
 701         switch (ddrctl & 0x30000) {
 702                 case DEVWD_4:  ret *= 2;
 703                 case DEVWD_8:  ret *= 2;
 704                 case DEVWD_16: break;
 705         }
 706         if ((ddrctl & 0xc000) == 0x4000)
 707                 ret *= 2;
 708         return ret;
 709 #endif
 710         BUG();
 711 }
 712
 713 void __init setup_arch(char **cmdline_p)
 714 {
 715         unsigned long sclk, cclk;
 716
 717 #ifdef CONFIG_DUMMY_CONSOLE
 718         conswitchp = &dummy_con;
 719 #endif
 720
 721 #if defined(CONFIG_CMDLINE_BOOL)
 722         strncpy(&command_line[0], CONFIG_CMDLINE, sizeof(command_line));
 723         command_line[sizeof(command_line) - 1] = 0;
 724 #endif
 725
 726         /* Keep a copy of command line */
 727         *cmdline_p = &command_line[0];
 728         memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 729         boot_command_line[COMMAND_LINE_SIZE - 1] = '\0';
 730
 731         /* setup memory defaults from the user config */
 732         physical_mem_end = 0;
 733         _ramend = get_mem_size() * 1024 * 1024;
 734
 735         memset(&bfin_memmap, 0, sizeof(bfin_memmap));
 736
 737         parse_cmdline_early(&command_line[0]);
 738
 739         if (physical_mem_end == 0)
 740                 physical_mem_end = _ramend;
 741
 742         memory_setup();
 743
 744         /* Initialize Async memory banks */
 745         bfin_write_EBIU_AMBCTL0(AMBCTL0VAL);
 746         bfin_write_EBIU_AMBCTL1(AMBCTL1VAL);
 747         bfin_write_EBIU_AMGCTL(AMGCTLVAL);
 748 #ifdef CONFIG_EBIU_MBSCTLVAL
 749         bfin_write_EBIU_MBSCTL(CONFIG_EBIU_MBSCTLVAL);
 750         bfin_write_EBIU_MODE(CONFIG_EBIU_MODEVAL);
 751         bfin_write_EBIU_FCTL(CONFIG_EBIU_FCTLVAL);
 752 #endif
 753
 754         cclk = get_cclk();
 755         sclk = get_sclk();
 756
 757 #if !defined(CONFIG_BFIN_KERNEL_CLOCK)
 758         if (ANOMALY_05000273 && cclk == sclk)
 759                 panic("ANOMALY 05000273, SCLK can not be same as CCLK");
 760 #endif
 761
 762 #ifdef BF561_FAMILY
 763         if (ANOMALY_05000266) {
 764                 bfin_read_IMDMA_D0_IRQ_STATUS();
 765                 bfin_read_IMDMA_D1_IRQ_STATUS();
 766         }
 767 #endif
 768         printk(KERN_INFO "Hardware Trace ");
 769         if (bfin_read_TBUFCTL() & 0x1)
 770                 printk("Active ");
 771         else
 772                 printk("Off ");
 773         if (bfin_read_TBUFCTL() & 0x2)
 774                 printk("and Enabled\n");
 775         else
 776         printk("and Disabled\n");
 777
 778 #if defined(CONFIG_CHR_DEV_FLASH) || defined(CONFIG_BLK_DEV_FLASH)
 779         /* we need to initialize the Flashrom device here since we might
 780          * do things with flash early on in the boot
 781          */
 782         flash_probe();
 783 #endif
 784
 785         _bfin_swrst = bfin_read_SWRST();
 786
 787 #ifdef CONFIG_DEBUG_DOUBLEFAULT_PRINT
 788         bfin_write_SWRST(_bfin_swrst & ~DOUBLE_FAULT);
 789 #endif
 790 #ifdef CONFIG_DEBUG_DOUBLEFAULT_RESET
 791         bfin_write_SWRST(_bfin_swrst | DOUBLE_FAULT);
 792 #endif
 793
 794         if (_bfin_swrst & RESET_DOUBLE) {
 795                 printk(KERN_EMERG "Recovering from DOUBLE FAULT event\n");
 796 #ifdef CONFIG_DEBUG_DOUBLEFAULT
 797                 /* We assume the crashing kernel, and the current symbol table match */
 798                 printk(KERN_EMERG " While handling exception (EXCAUSE = 0x%x) at %pF\n",
 799                         (int)init_saved_seqstat & SEQSTAT_EXCAUSE, init_saved_retx);
 800                 printk(KERN_NOTICE "   DCPLB_FAULT_ADDR: %pF\n", init_saved_dcplb_fault_addr);
 801                 printk(KERN_NOTICE "   ICPLB_FAULT_ADDR: %pF\n", init_saved_icplb_fault_addr);
 802 #endif
 803                 printk(KERN_NOTICE " The instruction at %pF caused a double exception\n",
 804                         init_retx);
 805         } else if (_bfin_swrst & RESET_WDOG)
 806                 printk(KERN_INFO "Recovering from Watchdog event\n");
 807         else if (_bfin_swrst & RESET_SOFTWARE)
 808                 printk(KERN_NOTICE "Reset caused by Software reset\n");
 809
 810         printk(KERN_INFO "Blackfin support (C) 2004-2008 Analog Devices, Inc.\n");
 811         if (bfin_compiled_revid() == 0xffff)
 812                 printk(KERN_INFO "Compiled for ADSP-%s Rev any\n", CPU);
 813         else if (bfin_compiled_revid() == -1)
 814                 printk(KERN_INFO "Compiled for ADSP-%s Rev none\n", CPU);
 815         else
 816                 printk(KERN_INFO "Compiled for ADSP-%s Rev 0.%d\n", CPU, bfin_compiled_revid());
 817
 818         if (unlikely(CPUID != bfin_cpuid()))
 819                 printk(KERN_ERR "ERROR: Not running on ADSP-%s: unknown CPUID 0x%04x Rev 0.%d\n",
 820                         CPU, bfin_cpuid(), bfin_revid());
 821         else {
 822                 if (bfin_revid() != bfin_compiled_revid()) {
 823                         if (bfin_compiled_revid() == -1)
 824                                 printk(KERN_ERR "Warning: Compiled for Rev none, but running on Rev %d\n",
 825                                        bfin_revid());
 826                         else if (bfin_compiled_revid() != 0xffff)
 827                                 printk(KERN_ERR "Warning: Compiled for Rev %d, but running on Rev %d\n",
 828                                        bfin_compiled_revid(), bfin_revid());
 829                 }
 830                 if (bfin_revid() <= CONFIG_BF_REV_MIN || bfin_revid() > CONFIG_BF_REV_MAX)
 831                         printk(KERN_ERR "Warning: Unsupported Chip Revision ADSP-%s Rev 0.%d detected\n",
 832                                CPU, bfin_revid());
 833         }
 834
 835         printk(KERN_INFO "Blackfin Linux support by http://blackfin.uclinux.org/\n");
 836
 837         printk(KERN_INFO "Processor Speed: %lu MHz core clock and %lu MHz System Clock\n",
 838                cclk / 1000000,  sclk / 1000000);
 839
 840         if (ANOMALY_05000273 && (cclk >> 1) <= sclk)
 841                 printk("\n\n\nANOMALY_05000273: CCLK must be >= 2*SCLK !!!\n\n\n");
 842
 843         setup_bootmem_allocator();
 844
 845         paging_init();
 846
 847         /* Copy atomic sequences to their fixed location, and sanity check that
 848            these locations are the ones that we advertise to userspace.  */
 849         memcpy((void *)FIXED_CODE_START, &fixed_code_start,
 850                FIXED_CODE_END - FIXED_CODE_START);
 851         BUG_ON((char *)&sigreturn_stub - (char *)&fixed_code_start
 852                != SIGRETURN_STUB - FIXED_CODE_START);
 853         BUG_ON((char *)&atomic_xchg32 - (char *)&fixed_code_start
 854                != ATOMIC_XCHG32 - FIXED_CODE_START);
 855         BUG_ON((char *)&atomic_cas32 - (char *)&fixed_code_start
 856                != ATOMIC_CAS32 - FIXED_CODE_START);
 857         BUG_ON((char *)&atomic_add32 - (char *)&fixed_code_start
 858                != ATOMIC_ADD32 - FIXED_CODE_START);
 859         BUG_ON((char *)&atomic_sub32 - (char *)&fixed_code_start
 860                != ATOMIC_SUB32 - FIXED_CODE_START);
 861         BUG_ON((char *)&atomic_ior32 - (char *)&fixed_code_start
 862                != ATOMIC_IOR32 - FIXED_CODE_START);
 863         BUG_ON((char *)&atomic_and32 - (char *)&fixed_code_start
 864                != ATOMIC_AND32 - FIXED_CODE_START);
 865         BUG_ON((char *)&atomic_xor32 - (char *)&fixed_code_start
 866                != ATOMIC_XOR32 - FIXED_CODE_START);
 867         BUG_ON((char *)&safe_user_instruction - (char *)&fixed_code_start
 868                 != SAFE_USER_INSTRUCTION - FIXED_CODE_START);
 869
 870         init_exception_vectors();
 871         bfin_cache_init();
 872 }
 873
 874 static int __init topology_init(void)
 875 {
 876         int cpu;
 877
 878         for_each_possible_cpu(cpu) {
 879                 struct cpu *c = &per_cpu(cpu_devices, cpu);
 880
 881                 register_cpu(c, cpu);
 882         }
 883
 884         return 0;
 885 }
 886
 887 subsys_initcall(topology_init);
 888
 889 /* Get the voltage input multiplier */
 890 static u_long cached_vco_pll_ctl, cached_vco;
 891 static u_long get_vco(void)
 892 {
 893         u_long msel;
 894
 895         u_long pll_ctl = bfin_read_PLL_CTL();
 896         if (pll_ctl == cached_vco_pll_ctl)
 897                 return cached_vco;
 898         else
 899                 cached_vco_pll_ctl = pll_ctl;
 900
 901         msel = (pll_ctl >> 9) & 0x3F;
 902         if (0 == msel)
 903                 msel = 64;
 904
 905         cached_vco = CONFIG_CLKIN_HZ;
 906         cached_vco >>= (1 & pll_ctl);   /* DF bit */
 907         cached_vco *= msel;
 908         return cached_vco;
 909 }
 910
 911 /* Get the Core clock */
 912 static u_long cached_cclk_pll_div, cached_cclk;
 913 u_long get_cclk(void)
 914 {
 915         u_long csel, ssel;
 916
 917         if (bfin_read_PLL_STAT() & 0x1)
 918                 return CONFIG_CLKIN_HZ;
 919
 920         ssel = bfin_read_PLL_DIV();
 921         if (ssel == cached_cclk_pll_div)
 922                 return cached_cclk;
 923         else
 924                 cached_cclk_pll_div = ssel;
 925
 926         csel = ((ssel >> 4) & 0x03);
 927         ssel &= 0xf;
 928         if (ssel && ssel < (1 << csel)) /* SCLK > CCLK */
 929                 cached_cclk = get_vco() / ssel;
 930         else
 931                 cached_cclk = get_vco() >> csel;
 932         return cached_cclk;
 933 }
 934 EXPORT_SYMBOL(get_cclk);
 935
 936 /* Get the System clock */
 937 static u_long cached_sclk_pll_div, cached_sclk;
 938 u_long get_sclk(void)
 939 {
 940         u_long ssel;
 941
 942         if (bfin_read_PLL_STAT() & 0x1)
 943                 return CONFIG_CLKIN_HZ;
 944
 945         ssel = bfin_read_PLL_DIV();
 946         if (ssel == cached_sclk_pll_div)
 947                 return cached_sclk;
 948         else
 949                 cached_sclk_pll_div = ssel;
 950
 951         ssel &= 0xf;
 952         if (0 == ssel) {
 953                 printk(KERN_WARNING "Invalid System Clock\n");
 954                 ssel = 1;
 955         }
 956
 957         cached_sclk = get_vco() / ssel;
 958         return cached_sclk;
 959 }
 960 EXPORT_SYMBOL(get_sclk);
 961
 962 unsigned long sclk_to_usecs(unsigned long sclk)
 963 {
 964         u64 tmp = USEC_PER_SEC * (u64)sclk;
 965         do_div(tmp, get_sclk());
 966         return tmp;
 967 }
 968 EXPORT_SYMBOL(sclk_to_usecs);
 969
 970 unsigned long usecs_to_sclk(unsigned long usecs)
 971 {
 972         u64 tmp = get_sclk() * (u64)usecs;
 973         do_div(tmp, USEC_PER_SEC);
 974         return tmp;
 975 }
 976 EXPORT_SYMBOL(usecs_to_sclk);
 977
 978 /*
 979  *      Get CPU information for use by the procfs.
 980  */
 981 static int show_cpuinfo(struct seq_file *m, void *v)
 982 {
 983         char *cpu, *mmu, *fpu, *vendor, *cache;
 984         uint32_t revid;
 985
 986         u_long cclk = 0, sclk = 0;
 987         u_int icache_size = BFIN_ICACHESIZE / 1024, dcache_size = 0, dsup_banks = 0;
 988
 989         cpu = CPU;
 990         mmu = "none";
 991         fpu = "none";
 992         revid = bfin_revid();
 993
 994         cclk = get_cclk();
 995         sclk = get_sclk();
 996
 997         switch (bfin_read_CHIPID() & CHIPID_MANUFACTURE) {
 998         case 0xca:
 999                 vendor = "Analog Devices";
1000                 break;
1001         default:
1002                 vendor = "unknown";
1003                 break;
1004         }
1005
1006         seq_printf(m, "processor\t: %d\n"
1007                 "vendor_id\t: %s\n",
1008                 *(unsigned int *)v,
1009                 vendor);
1010
1011         if (CPUID == bfin_cpuid())
1012                 seq_printf(m, "cpu family\t: 0x%04x\n", CPUID);
1013         else
1014                 seq_printf(m, "cpu family\t: Compiled for:0x%04x, running on:0x%04x\n",
1015                         CPUID, bfin_cpuid());
1016
1017         seq_printf(m, "model name\t: ADSP-%s %lu(MHz CCLK) %lu(MHz SCLK) (%s)\n"
1018                 "stepping\t: %d\n",
1019                 cpu, cclk/1000000, sclk/1000000,
1020 #ifdef CONFIG_MPU
1021                 "mpu on",
1022 #else
1023                 "mpu off",
1024 #endif
1025                 revid);
1026
1027         seq_printf(m, "cpu MHz\t\t: %lu.%03lu/%lu.%03lu\n",
1028                 cclk/1000000, cclk%1000000,
1029                 sclk/1000000, sclk%1000000);
1030         seq_printf(m, "bogomips\t: %lu.%02lu\n"
1031                 "Calibration\t: %lu loops\n",
1032                 (loops_per_jiffy * HZ) / 500000,
1033                 ((loops_per_jiffy * HZ) / 5000) % 100,
1034                 (loops_per_jiffy * HZ));
1035
1036         /* Check Cache configutation */
1037         switch (bfin_read_DMEM_CONTROL() & (1 << DMC0_P | 1 << DMC1_P)) {
1038         case ACACHE_BSRAM:
1039                 cache = "dbank-A/B\t: cache/sram";
1040                 dcache_size = 16;
1041                 dsup_banks = 1;
1042                 break;
1043         case ACACHE_BCACHE:
1044                 cache = "dbank-A/B\t: cache/cache";
1045                 dcache_size = 32;
1046                 dsup_banks = 2;
1047                 break;
1048         case ASRAM_BSRAM:
1049                 cache = "dbank-A/B\t: sram/sram";
1050                 dcache_size = 0;
1051                 dsup_banks = 0;
1052                 break;
1053         default:
1054                 cache = "unknown";
1055                 dcache_size = 0;
1056                 dsup_banks = 0;
1057                 break;
1058         }
1059
1060         /* Is it turned on? */
1061         if ((bfin_read_DMEM_CONTROL() & (ENDCPLB | DMC_ENABLE)) != (ENDCPLB | DMC_ENABLE))
1062                 dcache_size = 0;
1063
1064         if ((bfin_read_IMEM_CONTROL() & (IMC | ENICPLB)) != (IMC | ENICPLB))
1065                 icache_size = 0;
1066
1067         seq_printf(m, "cache size\t: %d KB(L1 icache) "
1068                 "%d KB(L1 dcache-%s) %d KB(L2 cache)\n",
1069                 icache_size, dcache_size,
1070 #if defined CONFIG_BFIN_WB
1071                 "wb"
1072 #elif defined CONFIG_BFIN_WT
1073                 "wt"
1074 #endif
1075                 "", 0);
1076
1077         seq_printf(m, "%s\n", cache);
1078
1079         if (icache_size)
1080                 seq_printf(m, "icache setup\t: %d Sub-banks/%d Ways, %d Lines/Way\n",
1081                            BFIN_ISUBBANKS, BFIN_IWAYS, BFIN_ILINES);
1082         else
1083                 seq_printf(m, "icache setup\t: off\n");
1084
1085         seq_printf(m,
1086                    "dcache setup\t: %d Super-banks/%d Sub-banks/%d Ways, %d Lines/Way\n",
1087                    dsup_banks, BFIN_DSUBBANKS, BFIN_DWAYS,
1088                    BFIN_DLINES);
1089 #ifdef CONFIG_BFIN_ICACHE_LOCK
1090         switch ((bfin_read_IMEM_CONTROL() >> 3) & WAYALL_L) {
1091         case WAY0_L:
1092                 seq_printf(m, "Way0 Locked-Down\n");
1093                 break;
1094         case WAY1_L:
1095                 seq_printf(m, "Way1 Locked-Down\n");
1096                 break;
1097         case WAY01_L:
1098                 seq_printf(m, "Way0,Way1 Locked-Down\n");
1099                 break;
1100         case WAY2_L:
1101                 seq_printf(m, "Way2 Locked-Down\n");
1102                 break;
1103         case WAY02_L:
1104                 seq_printf(m, "Way0,Way2 Locked-Down\n");
1105                 break;
1106         case WAY12_L:
1107                 seq_printf(m, "Way1,Way2 Locked-Down\n");
1108                 break;
1109         case WAY012_L:
1110                 seq_printf(m, "Way0,Way1 & Way2 Locked-Down\n");
1111                 break;
1112         case WAY3_L:
1113                 seq_printf(m, "Way3 Locked-Down\n");
1114                 break;
1115         case WAY03_L:
1116                 seq_printf(m, "Way0,Way3 Locked-Down\n");
1117                 break;
1118         case WAY13_L:
1119                 seq_printf(m, "Way1,Way3 Locked-Down\n");
1120                 break;
1121         case WAY013_L:
1122                 seq_printf(m, "Way 0,Way1,Way3 Locked-Down\n");
1123                 break;
1124         case WAY32_L:
1125                 seq_printf(m, "Way3,Way2 Locked-Down\n");
1126                 break;
1127         case WAY320_L:
1128                 seq_printf(m, "Way3,Way2,Way0 Locked-Down\n");
1129                 break;
1130         case WAY321_L:
1131                 seq_printf(m, "Way3,Way2,Way1 Locked-Down\n");
1132                 break;
1133         case WAYALL_L:
1134                 seq_printf(m, "All Ways are locked\n");
1135                 break;
1136         default:
1137                 seq_printf(m, "No Ways are locked\n");
1138         }
1139 #endif
1140         seq_printf(m, "board name\t: %s\n", bfin_board_name);
1141         seq_printf(m, "board memory\t: %ld kB (0x%p -> 0x%p)\n",
1142                  physical_mem_end >> 10, (void *)0, (void *)physical_mem_end);
1143         seq_printf(m, "kernel memory\t: %d kB (0x%p -> 0x%p)\n",
1144                 ((int)memory_end - (int)_stext) >> 10,
1145                 _stext,
1146                 (void *)memory_end);
1147
1148         return 0;
1149 }
1150
1151 static void *c_start(struct seq_file *m, loff_t *pos)
1152 {
1153         if (*pos == 0)
1154                 *pos = first_cpu(cpu_online_map);
1155         if (*pos >= num_online_cpus())
1156                 return NULL;
1157
1158         return pos;
1159 }
1160
1161 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1162 {
1163         *pos = next_cpu(*pos, cpu_online_map);
1164
1165         return c_start(m, pos);
1166 }
1167
1168 static void c_stop(struct seq_file *m, void *v)
1169 {
1170 }
1171
1172 const struct seq_operations cpuinfo_op = {
1173         .start = c_start,
1174         .next = c_next,
1175         .stop = c_stop,
1176         .show = show_cpuinfo,
1177 };
1178
1179 void __init cmdline_init(const char *r0)
1180 {
1181         if (r0)
1182                 strncpy(command_line, r0, COMMAND_LINE_SIZE);
1183 }