arch/xtensa/kernel/setup.c

   1 /*
   2  * arch/xtensa/kernel/setup.c
   3  *
   4  * This file is subject to the terms and conditions of the GNU General Public
   5  * License.  See the file "COPYING" in the main directory of this archive
   6  * for more details.
   7  *
   8  * Copyright (C) 1995  Linus Torvalds
   9  * Copyright (C) 2001 - 2005  Tensilica Inc.
  10  *
  11  * Chris Zankel <chris@zankel.net>
  12  * Joe Taylor   <joe@tensilica.com, joetylr@yahoo.com>
  13  * Kevin Chea
  14  * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
  15  */
  16
  17 #include <linux/errno.h>
  18 #include <linux/init.h>
  19 #include <linux/mm.h>
  20 #include <linux/proc_fs.h>
  21 #include <linux/screen_info.h>
  22 #include <linux/bootmem.h>
  23 #include <linux/kernel.h>
  24 #include <linux/percpu.h>
  25 #include <linux/cpu.h>
  26 #include <linux/of_fdt.h>
  27 #include <linux/of_platform.h>
  28
  29 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  30 # include <linux/console.h>
  31 #endif
  32
  33 #ifdef CONFIG_RTC
  34 # include <linux/timex.h>
  35 #endif
  36
  37 #ifdef CONFIG_PROC_FS
  38 # include <linux/seq_file.h>
  39 #endif
  40
  41 #include <asm/bootparam.h>
  42 #include <asm/mmu_context.h>
  43 #include <asm/pgtable.h>
  44 #include <asm/processor.h>
  45 #include <asm/timex.h>
  46 #include <asm/platform.h>
  47 #include <asm/page.h>
  48 #include <asm/setup.h>
  49 #include <asm/param.h>
  50 #include <asm/traps.h>
  51 #include <asm/smp.h>
  52
  53 #include <platform/hardware.h>
  54
  55 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  56 struct screen_info screen_info = { 0, 24, 0, 0, 0, 80, 0, 0, 0, 24, 1, 16};
  57 #endif
  58
  59 #ifdef CONFIG_BLK_DEV_FD
  60 extern struct fd_ops no_fd_ops;
  61 struct fd_ops *fd_ops;
  62 #endif
  63
  64 extern struct rtc_ops no_rtc_ops;
  65 struct rtc_ops *rtc_ops;
  66
  67 #ifdef CONFIG_BLK_DEV_INITRD
  68 extern unsigned long initrd_start;
  69 extern unsigned long initrd_end;
  70 int initrd_is_mapped = 0;
  71 extern int initrd_below_start_ok;
  72 #endif
  73
  74 #ifdef CONFIG_OF
  75 extern u32 __dtb_start[];
  76 void *dtb_start = __dtb_start;
  77 #endif
  78
  79 unsigned char aux_device_present;
  80 extern unsigned long loops_per_jiffy;
  81
  82 /* Command line specified as configuration option. */
  83
  84 static char __initdata command_line[COMMAND_LINE_SIZE];
  85
  86 #ifdef CONFIG_CMDLINE_BOOL
  87 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  88 #endif
  89
  90 sysmem_info_t __initdata sysmem;
  91
  92 extern int mem_reserve(unsigned long, unsigned long, int);
  93 extern void bootmem_init(void);
  94 extern void zones_init(void);
  95
  96 /*
  97  * Boot parameter parsing.
  98  *
  99  * The Xtensa port uses a list of variable-sized tags to pass data to
 100  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
 101  * to be recognised. The list is terminated with a zero-sized
 102  * BP_TAG_LAST tag.
 103  */
 104
 105 typedef struct tagtable {
 106         u32 tag;
 107         int (*parse)(const bp_tag_t*);
 108 } tagtable_t;
 109
 110 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn           \
 111         __attribute__((used, section(".taglist"))) = { tag, fn }
 112
 113 /* parse current tag */
 114
 115 static int __init add_sysmem_bank(unsigned long type, unsigned long start,
 116                 unsigned long end)
 117 {
 118         if (sysmem.nr_banks >= SYSMEM_BANKS_MAX) {
 119                 printk(KERN_WARNING
 120                                 "Ignoring memory bank 0x%08lx size %ldKB\n",
 121                                 start, end - start);
 122                 return -EINVAL;
 123         }
 124         sysmem.bank[sysmem.nr_banks].type  = type;
 125         sysmem.bank[sysmem.nr_banks].start = PAGE_ALIGN(start);
 126         sysmem.bank[sysmem.nr_banks].end   = end & PAGE_MASK;
 127         sysmem.nr_banks++;
 128
 129         return 0;
 130 }
 131
 132 static int __init parse_tag_mem(const bp_tag_t *tag)
 133 {
 134         meminfo_t *mi = (meminfo_t *)(tag->data);
 135
 136         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
 137                 return -1;
 138
 139         return add_sysmem_bank(mi->type, mi->start, mi->end);
 140 }
 141
 142 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 143
 144 #ifdef CONFIG_BLK_DEV_INITRD
 145
 146 static int __init parse_tag_initrd(const bp_tag_t* tag)
 147 {
 148         meminfo_t* mi;
 149         mi = (meminfo_t*)(tag->data);
 150         initrd_start = (unsigned long)__va(mi->start);
 151         initrd_end = (unsigned long)__va(mi->end);
 152
 153         return 0;
 154 }
 155
 156 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
 157
 158 #ifdef CONFIG_OF
 159
 160 static int __init parse_tag_fdt(const bp_tag_t *tag)
 161 {
 162         dtb_start = __va(tag->data[0]);
 163         return 0;
 164 }
 165
 166 __tagtable(BP_TAG_FDT, parse_tag_fdt);
 167
 168 #endif /* CONFIG_OF */
 169
 170 #endif /* CONFIG_BLK_DEV_INITRD */
 171
 172 static int __init parse_tag_cmdline(const bp_tag_t* tag)
 173 {
 174         strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
 175         return 0;
 176 }
 177
 178 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
 179
 180 static int __init parse_bootparam(const bp_tag_t* tag)
 181 {
 182         extern tagtable_t __tagtable_begin, __tagtable_end;
 183         tagtable_t *t;
 184
 185         /* Boot parameters must start with a BP_TAG_FIRST tag. */
 186
 187         if (tag->id != BP_TAG_FIRST) {
 188                 printk(KERN_WARNING "Invalid boot parameters!\n");
 189                 return 0;
 190         }
 191
 192         tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
 193
 194         /* Parse all tags. */
 195
 196         while (tag != NULL && tag->id != BP_TAG_LAST) {
 197                 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
 198                         if (tag->id == t->tag) {
 199                                 t->parse(tag);
 200                                 break;
 201                         }
 202                 }
 203                 if (t == &__tagtable_end)
 204                         printk(KERN_WARNING "Ignoring tag "
 205                                "0x%08x\n", tag->id);
 206                 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
 207         }
 208
 209         return 0;
 210 }
 211
 212 #ifdef CONFIG_OF
 213 bool __initdata dt_memory_scan = false;
 214
 215 #if XCHAL_HAVE_PTP_MMU && XCHAL_HAVE_SPANNING_WAY
 216 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
 217 EXPORT_SYMBOL(xtensa_kio_paddr);
 218
 219 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 220                 int depth, void *data)
 221 {
 222         const __be32 *ranges;
 223         unsigned long len;
 224
 225         if (depth > 1)
 226                 return 0;
 227
 228         if (!of_flat_dt_is_compatible(node, "simple-bus"))
 229                 return 0;
 230
 231         ranges = of_get_flat_dt_prop(node, "ranges", &len);
 232         if (!ranges)
 233                 return 1;
 234         if (len == 0)
 235                 return 1;
 236
 237         xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
 238         /* round down to nearest 256MB boundary */
 239         xtensa_kio_paddr &= 0xf0000000;
 240
 241         return 1;
 242 }
 243 #else
 244 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 245                 int depth, void *data)
 246 {
 247         return 1;
 248 }
 249 #endif
 250
 251 void __init early_init_dt_add_memory_arch(u64 base, u64 size)
 252 {
 253         if (!dt_memory_scan)
 254                 return;
 255
 256         size &= PAGE_MASK;
 257         add_sysmem_bank(MEMORY_TYPE_CONVENTIONAL, base, base + size);
 258 }
 259
 260 void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 261 {
 262         return __alloc_bootmem(size, align, 0);
 263 }
 264
 265 void __init early_init_devtree(void *params)
 266 {
 267         if (sysmem.nr_banks == 0)
 268                 dt_memory_scan = true;
 269
 270         early_init_dt_scan(params);
 271         of_scan_flat_dt(xtensa_dt_io_area, NULL);
 272
 273         if (!command_line[0])
 274                 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 275 }
 276
 277 static int __init xtensa_device_probe(void)
 278 {
 279         of_platform_populate(NULL, of_default_bus_match_table, NULL, NULL);
 280         return 0;
 281 }
 282
 283 device_initcall(xtensa_device_probe);
 284
 285 #endif /* CONFIG_OF */
 286
 287 /*
 288  * Initialize architecture. (Early stage)
 289  */
 290
 291 void __init init_arch(bp_tag_t *bp_start)
 292 {
 293         sysmem.nr_banks = 0;
 294
 295         /* Parse boot parameters */
 296
 297         if (bp_start)
 298                 parse_bootparam(bp_start);
 299
 300 #ifdef CONFIG_OF
 301         early_init_devtree(dtb_start);
 302 #endif
 303
 304         if (sysmem.nr_banks == 0) {
 305                 sysmem.nr_banks = 1;
 306                 sysmem.bank[0].start = PLATFORM_DEFAULT_MEM_START;
 307                 sysmem.bank[0].end = PLATFORM_DEFAULT_MEM_START
 308                                      + PLATFORM_DEFAULT_MEM_SIZE;
 309         }
 310
 311 #ifdef CONFIG_CMDLINE_BOOL
 312         if (!command_line[0])
 313                 strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
 314 #endif
 315
 316         /* Early hook for platforms */
 317
 318         platform_init(bp_start);
 319
 320         /* Initialize MMU. */
 321
 322         init_mmu();
 323 }
 324
 325 /*
 326  * Initialize system. Setup memory and reserve regions.
 327  */
 328
 329 extern char _end;
 330 extern char _stext;
 331 extern char _WindowVectors_text_start;
 332 extern char _WindowVectors_text_end;
 333 extern char _DebugInterruptVector_literal_start;
 334 extern char _DebugInterruptVector_text_end;
 335 extern char _KernelExceptionVector_literal_start;
 336 extern char _KernelExceptionVector_text_end;
 337 extern char _UserExceptionVector_literal_start;
 338 extern char _UserExceptionVector_text_end;
 339 extern char _DoubleExceptionVector_literal_start;
 340 extern char _DoubleExceptionVector_text_end;
 341 #if XCHAL_EXCM_LEVEL >= 2
 342 extern char _Level2InterruptVector_text_start;
 343 extern char _Level2InterruptVector_text_end;
 344 #endif
 345 #if XCHAL_EXCM_LEVEL >= 3
 346 extern char _Level3InterruptVector_text_start;
 347 extern char _Level3InterruptVector_text_end;
 348 #endif
 349 #if XCHAL_EXCM_LEVEL >= 4
 350 extern char _Level4InterruptVector_text_start;
 351 extern char _Level4InterruptVector_text_end;
 352 #endif
 353 #if XCHAL_EXCM_LEVEL >= 5
 354 extern char _Level5InterruptVector_text_start;
 355 extern char _Level5InterruptVector_text_end;
 356 #endif
 357 #if XCHAL_EXCM_LEVEL >= 6
 358 extern char _Level6InterruptVector_text_start;
 359 extern char _Level6InterruptVector_text_end;
 360 #endif
 361
 362
 363
 364 #ifdef CONFIG_S32C1I_SELFTEST
 365 #if XCHAL_HAVE_S32C1I
 366
 367 static int __initdata rcw_word, rcw_probe_pc, rcw_exc;
 368
 369 /*
 370  * Basic atomic compare-and-swap, that records PC of S32C1I for probing.
 371  *
 372  * If *v == cmp, set *v = set.  Return previous *v.
 373  */
 374 static inline int probed_compare_swap(int *v, int cmp, int set)
 375 {
 376         int tmp;
 377
 378         __asm__ __volatile__(
 379                         "       movi    %1, 1f\n"
 380                         "       s32i    %1, %4, 0\n"
 381                         "       wsr     %2, scompare1\n"
 382                         "1:     s32c1i  %0, %3, 0\n"
 383                         : "=a" (set), "=&a" (tmp)
 384                         : "a" (cmp), "a" (v), "a" (&rcw_probe_pc), "0" (set)
 385                         : "memory"
 386                         );
 387         return set;
 388 }
 389
 390 /* Handle probed exception */
 391
 392 static void __init do_probed_exception(struct pt_regs *regs,
 393                 unsigned long exccause)
 394 {
 395         if (regs->pc == rcw_probe_pc) { /* exception on s32c1i ? */
 396                 regs->pc += 3;          /* skip the s32c1i instruction */
 397                 rcw_exc = exccause;
 398         } else {
 399                 do_unhandled(regs, exccause);
 400         }
 401 }
 402
 403 /* Simple test of S32C1I (soc bringup assist) */
 404
 405 static int __init check_s32c1i(void)
 406 {
 407         int n, cause1, cause2;
 408         void *handbus, *handdata, *handaddr; /* temporarily saved handlers */
 409
 410         rcw_probe_pc = 0;
 411         handbus  = trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR,
 412                         do_probed_exception);
 413         handdata = trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR,
 414                         do_probed_exception);
 415         handaddr = trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR,
 416                         do_probed_exception);
 417
 418         /* First try an S32C1I that does not store: */
 419         rcw_exc = 0;
 420         rcw_word = 1;
 421         n = probed_compare_swap(&rcw_word, 0, 2);
 422         cause1 = rcw_exc;
 423
 424         /* took exception? */
 425         if (cause1 != 0) {
 426                 /* unclean exception? */
 427                 if (n != 2 || rcw_word != 1)
 428                         panic("S32C1I exception error");
 429         } else if (rcw_word != 1 || n != 1) {
 430                 panic("S32C1I compare error");
 431         }
 432
 433         /* Then an S32C1I that stores: */
 434         rcw_exc = 0;
 435         rcw_word = 0x1234567;
 436         n = probed_compare_swap(&rcw_word, 0x1234567, 0xabcde);
 437         cause2 = rcw_exc;
 438
 439         if (cause2 != 0) {
 440                 /* unclean exception? */
 441                 if (n != 0xabcde || rcw_word != 0x1234567)
 442                         panic("S32C1I exception error (b)");
 443         } else if (rcw_word != 0xabcde || n != 0x1234567) {
 444                 panic("S32C1I store error");
 445         }
 446
 447         /* Verify consistency of exceptions: */
 448         if (cause1 || cause2) {
 449                 pr_warn("S32C1I took exception %d, %d\n", cause1, cause2);
 450                 /* If emulation of S32C1I upon bus error gets implemented,
 451                    we can get rid of this panic for single core (not SMP) */
 452                 panic("S32C1I exceptions not currently supported");
 453         }
 454         if (cause1 != cause2)
 455                 panic("inconsistent S32C1I exceptions");
 456
 457         trap_set_handler(EXCCAUSE_LOAD_STORE_ERROR, handbus);
 458         trap_set_handler(EXCCAUSE_LOAD_STORE_DATA_ERROR, handdata);
 459         trap_set_handler(EXCCAUSE_LOAD_STORE_ADDR_ERROR, handaddr);
 460         return 0;
 461 }
 462
 463 #else /* XCHAL_HAVE_S32C1I */
 464
 465 /* This condition should not occur with a commercially deployed processor.
 466    Display reminder for early engr test or demo chips / FPGA bitstreams */
 467 static int __init check_s32c1i(void)
 468 {
 469         pr_warn("Processor configuration lacks atomic compare-and-swap support!\n");
 470         return 0;
 471 }
 472
 473 #endif /* XCHAL_HAVE_S32C1I */
 474 early_initcall(check_s32c1i);
 475 #endif /* CONFIG_S32C1I_SELFTEST */
 476
 477
 478 void __init setup_arch(char **cmdline_p)
 479 {
 480         strlcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
 481         *cmdline_p = command_line;
 482
 483         /* Reserve some memory regions */
 484
 485 #ifdef CONFIG_BLK_DEV_INITRD
 486         if (initrd_start < initrd_end) {
 487                 initrd_is_mapped = mem_reserve(__pa(initrd_start),
 488                                                __pa(initrd_end), 0);
 489                 initrd_below_start_ok = 1;
 490         } else {
 491                 initrd_start = 0;
 492         }
 493 #endif
 494
 495         mem_reserve(__pa(&_stext),__pa(&_end), 1);
 496
 497         mem_reserve(__pa(&_WindowVectors_text_start),
 498                     __pa(&_WindowVectors_text_end), 0);
 499
 500         mem_reserve(__pa(&_DebugInterruptVector_literal_start),
 501                     __pa(&_DebugInterruptVector_text_end), 0);
 502
 503         mem_reserve(__pa(&_KernelExceptionVector_literal_start),
 504                     __pa(&_KernelExceptionVector_text_end), 0);
 505
 506         mem_reserve(__pa(&_UserExceptionVector_literal_start),
 507                     __pa(&_UserExceptionVector_text_end), 0);
 508
 509         mem_reserve(__pa(&_DoubleExceptionVector_literal_start),
 510                     __pa(&_DoubleExceptionVector_text_end), 0);
 511
 512 #if XCHAL_EXCM_LEVEL >= 2
 513         mem_reserve(__pa(&_Level2InterruptVector_text_start),
 514                     __pa(&_Level2InterruptVector_text_end), 0);
 515 #endif
 516 #if XCHAL_EXCM_LEVEL >= 3
 517         mem_reserve(__pa(&_Level3InterruptVector_text_start),
 518                     __pa(&_Level3InterruptVector_text_end), 0);
 519 #endif
 520 #if XCHAL_EXCM_LEVEL >= 4
 521         mem_reserve(__pa(&_Level4InterruptVector_text_start),
 522                     __pa(&_Level4InterruptVector_text_end), 0);
 523 #endif
 524 #if XCHAL_EXCM_LEVEL >= 5
 525         mem_reserve(__pa(&_Level5InterruptVector_text_start),
 526                     __pa(&_Level5InterruptVector_text_end), 0);
 527 #endif
 528 #if XCHAL_EXCM_LEVEL >= 6
 529         mem_reserve(__pa(&_Level6InterruptVector_text_start),
 530                     __pa(&_Level6InterruptVector_text_end), 0);
 531 #endif
 532
 533         bootmem_init();
 534
 535         unflatten_and_copy_device_tree();
 536
 537         platform_setup(cmdline_p);
 538
 539 #ifdef CONFIG_SMP
 540         smp_init_cpus();
 541 #endif
 542
 543         paging_init();
 544         zones_init();
 545
 546 #ifdef CONFIG_VT
 547 # if defined(CONFIG_VGA_CONSOLE)
 548         conswitchp = &vga_con;
 549 # elif defined(CONFIG_DUMMY_CONSOLE)
 550         conswitchp = &dummy_con;
 551 # endif
 552 #endif
 553
 554 #ifdef CONFIG_PCI
 555         platform_pcibios_init();
 556 #endif
 557 }
 558
 559 static DEFINE_PER_CPU(struct cpu, cpu_data);
 560
 561 static int __init topology_init(void)
 562 {
 563         int i;
 564
 565         for_each_possible_cpu(i) {
 566                 struct cpu *cpu = &per_cpu(cpu_data, i);
 567                 cpu->hotpluggable = !!i;
 568                 register_cpu(cpu, i);
 569         }
 570
 571         return 0;
 572 }
 573 subsys_initcall(topology_init);
 574
 575 void machine_restart(char * cmd)
 576 {
 577         platform_restart();
 578 }
 579
 580 void machine_halt(void)
 581 {
 582         platform_halt();
 583         while (1);
 584 }
 585
 586 void machine_power_off(void)
 587 {
 588         platform_power_off();
 589         while (1);
 590 }
 591 #ifdef CONFIG_PROC_FS
 592
 593 /*
 594  * Display some core information through /proc/cpuinfo.
 595  */
 596
 597 static int
 598 c_show(struct seq_file *f, void *slot)
 599 {
 600         char buf[NR_CPUS * 5];
 601
 602         cpulist_scnprintf(buf, sizeof(buf), cpu_online_mask);
 603         /* high-level stuff */
 604         seq_printf(f, "CPU count\t: %u\n"
 605                       "CPU list\t: %s\n"
 606                       "vendor_id\t: Tensilica\n"
 607                       "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
 608                       "core ID\t\t: " XCHAL_CORE_ID "\n"
 609                       "build ID\t: 0x%x\n"
 610                       "byte order\t: %s\n"
 611                       "cpu MHz\t\t: %lu.%02lu\n"
 612                       "bogomips\t: %lu.%02lu\n",
 613                       num_online_cpus(),
 614                       buf,
 615                       XCHAL_BUILD_UNIQUE_ID,
 616                       XCHAL_HAVE_BE ?  "big" : "little",
 617                       ccount_freq/1000000,
 618                       (ccount_freq/10000) % 100,
 619                       loops_per_jiffy/(500000/HZ),
 620                       (loops_per_jiffy/(5000/HZ)) % 100);
 621
 622         seq_printf(f,"flags\t\t: "
 623 #if XCHAL_HAVE_NMI
 624                      "nmi "
 625 #endif
 626 #if XCHAL_HAVE_DEBUG
 627                      "debug "
 628 # if XCHAL_HAVE_OCD
 629                      "ocd "
 630 # endif
 631 #endif
 632 #if XCHAL_HAVE_DENSITY
 633                      "density "
 634 #endif
 635 #if XCHAL_HAVE_BOOLEANS
 636                      "boolean "
 637 #endif
 638 #if XCHAL_HAVE_LOOPS
 639                      "loop "
 640 #endif
 641 #if XCHAL_HAVE_NSA
 642                      "nsa "
 643 #endif
 644 #if XCHAL_HAVE_MINMAX
 645                      "minmax "
 646 #endif
 647 #if XCHAL_HAVE_SEXT
 648                      "sext "
 649 #endif
 650 #if XCHAL_HAVE_CLAMPS
 651                      "clamps "
 652 #endif
 653 #if XCHAL_HAVE_MAC16
 654                      "mac16 "
 655 #endif
 656 #if XCHAL_HAVE_MUL16
 657                      "mul16 "
 658 #endif
 659 #if XCHAL_HAVE_MUL32
 660                      "mul32 "
 661 #endif
 662 #if XCHAL_HAVE_MUL32_HIGH
 663                      "mul32h "
 664 #endif
 665 #if XCHAL_HAVE_FP
 666                      "fpu "
 667 #endif
 668 #if XCHAL_HAVE_S32C1I
 669                      "s32c1i "
 670 #endif
 671                      "\n");
 672
 673         /* Registers. */
 674         seq_printf(f,"physical aregs\t: %d\n"
 675                      "misc regs\t: %d\n"
 676                      "ibreak\t\t: %d\n"
 677                      "dbreak\t\t: %d\n",
 678                      XCHAL_NUM_AREGS,
 679                      XCHAL_NUM_MISC_REGS,
 680                      XCHAL_NUM_IBREAK,
 681                      XCHAL_NUM_DBREAK);
 682
 683
 684         /* Interrupt. */
 685         seq_printf(f,"num ints\t: %d\n"
 686                      "ext ints\t: %d\n"
 687                      "int levels\t: %d\n"
 688                      "timers\t\t: %d\n"
 689                      "debug level\t: %d\n",
 690                      XCHAL_NUM_INTERRUPTS,
 691                      XCHAL_NUM_EXTINTERRUPTS,
 692                      XCHAL_NUM_INTLEVELS,
 693                      XCHAL_NUM_TIMERS,
 694                      XCHAL_DEBUGLEVEL);
 695
 696         /* Cache */
 697         seq_printf(f,"icache line size: %d\n"
 698                      "icache ways\t: %d\n"
 699                      "icache size\t: %d\n"
 700                      "icache flags\t: "
 701 #if XCHAL_ICACHE_LINE_LOCKABLE
 702                      "lock "
 703 #endif
 704                      "\n"
 705                      "dcache line size: %d\n"
 706                      "dcache ways\t: %d\n"
 707                      "dcache size\t: %d\n"
 708                      "dcache flags\t: "
 709 #if XCHAL_DCACHE_IS_WRITEBACK
 710                      "writeback "
 711 #endif
 712 #if XCHAL_DCACHE_LINE_LOCKABLE
 713                      "lock "
 714 #endif
 715                      "\n",
 716                      XCHAL_ICACHE_LINESIZE,
 717                      XCHAL_ICACHE_WAYS,
 718                      XCHAL_ICACHE_SIZE,
 719                      XCHAL_DCACHE_LINESIZE,
 720                      XCHAL_DCACHE_WAYS,
 721                      XCHAL_DCACHE_SIZE);
 722
 723         return 0;
 724 }
 725
 726 /*
 727  * We show only CPU #0 info.
 728  */
 729 static void *
 730 c_start(struct seq_file *f, loff_t *pos)
 731 {
 732         return (*pos == 0) ? (void *)1 : NULL;
 733 }
 734
 735 static void *
 736 c_next(struct seq_file *f, void *v, loff_t *pos)
 737 {
 738         return NULL;
 739 }
 740
 741 static void
 742 c_stop(struct seq_file *f, void *v)
 743 {
 744 }
 745
 746 const struct seq_operations cpuinfo_op =
 747 {
 748         .start  = c_start,
 749         .next   = c_next,
 750         .stop   = c_stop,
 751         .show   = c_show,
 752 };
 753
 754 #endif /* CONFIG_PROC_FS */