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  * Copyright (C) 2014 - 2016  Cadence Design Systems Inc.
  11  *
  12  * Chris Zankel <chris@zankel.net>
  13  * Joe Taylor   <joe@tensilica.com, joetylr@yahoo.com>
  14  * Kevin Chea
  15  * Marc Gauthier<marc@tensilica.com> <marc@alumni.uwaterloo.ca>
  16  */
  17
  18 #include <linux/errno.h>
  19 #include <linux/init.h>
  20 #include <linux/mm.h>
  21 #include <linux/proc_fs.h>
  22 #include <linux/kernel.h>
  23 #include <linux/percpu.h>
  24 #include <linux/reboot.h>
  25 #include <linux/cpu.h>
  26 #include <linux/of.h>
  27 #include <linux/of_fdt.h>
  28
  29 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  30 # include <linux/console.h>
  31 #endif
  32
  33 #ifdef CONFIG_PROC_FS
  34 # include <linux/seq_file.h>
  35 #endif
  36
  37 #include <asm/bootparam.h>
  38 #include <asm/kasan.h>
  39 #include <asm/mmu_context.h>
  40 #include <asm/page.h>
  41 #include <asm/param.h>
  42 #include <asm/platform.h>
  43 #include <asm/processor.h>
  44 #include <asm/sections.h>
  45 #include <asm/setup.h>
  46 #include <asm/smp.h>
  47 #include <asm/sysmem.h>
  48 #include <asm/timex.h>
  49 #include <asm/traps.h>
  50
  51 #ifdef CONFIG_BLK_DEV_INITRD
  52 extern unsigned long initrd_start;
  53 extern unsigned long initrd_end;
  54 extern int initrd_below_start_ok;
  55 #endif
  56
  57 #ifdef CONFIG_USE_OF
  58 void *dtb_start = __dtb_start;
  59 #endif
  60
  61 extern unsigned long loops_per_jiffy;
  62
  63 /* Command line specified as configuration option. */
  64
  65 static char __initdata command_line[COMMAND_LINE_SIZE];
  66
  67 #ifdef CONFIG_CMDLINE_BOOL
  68 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  69 #endif
  70
  71 #ifdef CONFIG_PARSE_BOOTPARAM
  72 /*
  73  * Boot parameter parsing.
  74  *
  75  * The Xtensa port uses a list of variable-sized tags to pass data to
  76  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
  77  * to be recognised. The list is terminated with a zero-sized
  78  * BP_TAG_LAST tag.
  79  */
  80
  81 typedef struct tagtable {
  82         u32 tag;
  83         int (*parse)(const bp_tag_t*);
  84 } tagtable_t;
  85
  86 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn           \
  87         __section(".taglist") __attribute__((used)) = { tag, fn }
  88
  89 /* parse current tag */
  90
  91 static int __init parse_tag_mem(const bp_tag_t *tag)
  92 {
  93         struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
  94
  95         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
  96                 return -1;
  97
  98         return memblock_add(mi->start, mi->end - mi->start);
  99 }
 100
 101 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 102
 103 #ifdef CONFIG_BLK_DEV_INITRD
 104
 105 static int __init parse_tag_initrd(const bp_tag_t* tag)
 106 {
 107         struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
 108
 109         initrd_start = (unsigned long)__va(mi->start);
 110         initrd_end = (unsigned long)__va(mi->end);
 111
 112         return 0;
 113 }
 114
 115 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
 116
 117 #endif /* CONFIG_BLK_DEV_INITRD */
 118
 119 #ifdef CONFIG_USE_OF
 120
 121 static int __init parse_tag_fdt(const bp_tag_t *tag)
 122 {
 123         dtb_start = __va(tag->data[0]);
 124         return 0;
 125 }
 126
 127 __tagtable(BP_TAG_FDT, parse_tag_fdt);
 128
 129 #endif /* CONFIG_USE_OF */
 130
 131 static int __init parse_tag_cmdline(const bp_tag_t* tag)
 132 {
 133         strscpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
 134         return 0;
 135 }
 136
 137 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
 138
 139 static int __init parse_bootparam(const bp_tag_t* tag)
 140 {
 141         extern tagtable_t __tagtable_begin, __tagtable_end;
 142         tagtable_t *t;
 143
 144         /* Boot parameters must start with a BP_TAG_FIRST tag. */
 145
 146         if (tag->id != BP_TAG_FIRST) {
 147                 pr_warn("Invalid boot parameters!\n");
 148                 return 0;
 149         }
 150
 151         tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
 152
 153         /* Parse all tags. */
 154
 155         while (tag != NULL && tag->id != BP_TAG_LAST) {
 156                 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
 157                         if (tag->id == t->tag) {
 158                                 t->parse(tag);
 159                                 break;
 160                         }
 161                 }
 162                 if (t == &__tagtable_end)
 163                         pr_warn("Ignoring tag 0x%08x\n", tag->id);
 164                 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
 165         }
 166
 167         return 0;
 168 }
 169 #else
 170 static int __init parse_bootparam(const bp_tag_t *tag)
 171 {
 172         pr_info("Ignoring boot parameters at %p\n", tag);
 173         return 0;
 174 }
 175 #endif
 176
 177 #ifdef CONFIG_USE_OF
 178
 179 #if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
 180 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
 181 EXPORT_SYMBOL(xtensa_kio_paddr);
 182
 183 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 184                 int depth, void *data)
 185 {
 186         const __be32 *ranges;
 187         int len;
 188
 189         if (depth > 1)
 190                 return 0;
 191
 192         if (!of_flat_dt_is_compatible(node, "simple-bus"))
 193                 return 0;
 194
 195         ranges = of_get_flat_dt_prop(node, "ranges", &len);
 196         if (!ranges)
 197                 return 1;
 198         if (len == 0)
 199                 return 1;
 200
 201         xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
 202         /* round down to nearest 256MB boundary */
 203         xtensa_kio_paddr &= 0xf0000000;
 204
 205         init_kio();
 206
 207         return 1;
 208 }
 209 #else
 210 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 211                 int depth, void *data)
 212 {
 213         return 1;
 214 }
 215 #endif
 216
 217 void __init early_init_devtree(void *params)
 218 {
 219         early_init_dt_scan(params, __pa(params));
 220         of_scan_flat_dt(xtensa_dt_io_area, NULL);
 221
 222         if (!command_line[0])
 223                 strscpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 224 }
 225
 226 #endif /* CONFIG_USE_OF */
 227
 228 /*
 229  * Initialize architecture. (Early stage)
 230  */
 231
 232 void __init init_arch(bp_tag_t *bp_start)
 233 {
 234         /* Initialize basic exception handling if configuration may need it */
 235
 236         if (IS_ENABLED(CONFIG_KASAN) ||
 237             IS_ENABLED(CONFIG_XTENSA_LOAD_STORE))
 238                 early_trap_init();
 239
 240         /* Initialize MMU. */
 241
 242         init_mmu();
 243
 244         /* Initialize initial KASAN shadow map */
 245
 246         kasan_early_init();
 247
 248         /* Parse boot parameters */
 249
 250         if (bp_start)
 251                 parse_bootparam(bp_start);
 252
 253 #ifdef CONFIG_USE_OF
 254         early_init_devtree(dtb_start);
 255 #endif
 256
 257 #ifdef CONFIG_CMDLINE_BOOL
 258         if (!command_line[0])
 259                 strscpy(command_line, default_command_line, COMMAND_LINE_SIZE);
 260 #endif
 261
 262         /* Early hook for platforms */
 263
 264         platform_init(bp_start);
 265 }
 266
 267 /*
 268  * Initialize system. Setup memory and reserve regions.
 269  */
 270
 271 static inline int __init_memblock mem_reserve(unsigned long start,
 272                                               unsigned long end)
 273 {
 274         return memblock_reserve(start, end - start);
 275 }
 276
 277 void __init setup_arch(char **cmdline_p)
 278 {
 279         pr_info("config ID: %08x:%08x\n",
 280                 xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE));
 281         if (xtensa_get_sr(SREG_EPC) != XCHAL_HW_CONFIGID0 ||
 282             xtensa_get_sr(SREG_EXCSAVE) != XCHAL_HW_CONFIGID1)
 283                 pr_info("built for config ID: %08x:%08x\n",
 284                         XCHAL_HW_CONFIGID0, XCHAL_HW_CONFIGID1);
 285
 286         *cmdline_p = command_line;
 287         platform_setup(cmdline_p);
 288         strscpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
 289
 290         /* Reserve some memory regions */
 291
 292 #ifdef CONFIG_BLK_DEV_INITRD
 293         if (initrd_start < initrd_end &&
 294             !mem_reserve(__pa(initrd_start), __pa(initrd_end)))
 295                 initrd_below_start_ok = 1;
 296         else
 297                 initrd_start = 0;
 298 #endif
 299
 300         mem_reserve(__pa(_stext), __pa(_end));
 301 #ifdef CONFIG_XIP_KERNEL
 302 #ifdef CONFIG_VECTORS_ADDR
 303         mem_reserve(__pa(_xip_text_start), __pa(_xip_text_end));
 304 #endif
 305         mem_reserve(__pa(_xip_start), __pa(_xip_end));
 306 #endif
 307
 308 #ifdef CONFIG_VECTORS_ADDR
 309 #ifdef SUPPORT_WINDOWED
 310         mem_reserve(__pa(_WindowVectors_text_start),
 311                     __pa(_WindowVectors_text_end));
 312 #endif
 313
 314         mem_reserve(__pa(_DebugInterruptVector_text_start),
 315                     __pa(_DebugInterruptVector_text_end));
 316
 317         mem_reserve(__pa(_KernelExceptionVector_text_start),
 318                     __pa(_KernelExceptionVector_text_end));
 319
 320         mem_reserve(__pa(_UserExceptionVector_text_start),
 321                     __pa(_UserExceptionVector_text_end));
 322
 323         mem_reserve(__pa(_DoubleExceptionVector_text_start),
 324                     __pa(_DoubleExceptionVector_text_end));
 325
 326         mem_reserve(__pa(_exception_text_start),
 327                     __pa(_exception_text_end));
 328 #if XCHAL_EXCM_LEVEL >= 2
 329         mem_reserve(__pa(_Level2InterruptVector_text_start),
 330                     __pa(_Level2InterruptVector_text_end));
 331 #endif
 332 #if XCHAL_EXCM_LEVEL >= 3
 333         mem_reserve(__pa(_Level3InterruptVector_text_start),
 334                     __pa(_Level3InterruptVector_text_end));
 335 #endif
 336 #if XCHAL_EXCM_LEVEL >= 4
 337         mem_reserve(__pa(_Level4InterruptVector_text_start),
 338                     __pa(_Level4InterruptVector_text_end));
 339 #endif
 340 #if XCHAL_EXCM_LEVEL >= 5
 341         mem_reserve(__pa(_Level5InterruptVector_text_start),
 342                     __pa(_Level5InterruptVector_text_end));
 343 #endif
 344 #if XCHAL_EXCM_LEVEL >= 6
 345         mem_reserve(__pa(_Level6InterruptVector_text_start),
 346                     __pa(_Level6InterruptVector_text_end));
 347 #endif
 348
 349 #endif /* CONFIG_VECTORS_ADDR */
 350
 351 #ifdef CONFIG_SECONDARY_RESET_VECTOR
 352         mem_reserve(__pa(_SecondaryResetVector_text_start),
 353                     __pa(_SecondaryResetVector_text_end));
 354 #endif
 355         parse_early_param();
 356         bootmem_init();
 357         kasan_init();
 358         unflatten_and_copy_device_tree();
 359
 360 #ifdef CONFIG_SMP
 361         smp_init_cpus();
 362 #endif
 363
 364         paging_init();
 365         zones_init();
 366
 367 #ifdef CONFIG_VT
 368 # if defined(CONFIG_VGA_CONSOLE)
 369         conswitchp = &vga_con;
 370 # endif
 371 #endif
 372 }
 373
 374 static DEFINE_PER_CPU(struct cpu, cpu_data);
 375
 376 static int __init topology_init(void)
 377 {
 378         int i;
 379
 380         for_each_possible_cpu(i) {
 381                 struct cpu *cpu = &per_cpu(cpu_data, i);
 382                 cpu->hotpluggable = !!i;
 383                 register_cpu(cpu, i);
 384         }
 385
 386         return 0;
 387 }
 388 subsys_initcall(topology_init);
 389
 390 void cpu_reset(void)
 391 {
 392 #if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
 393         local_irq_disable();
 394         /*
 395          * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
 396          * be flushed.
 397          * Way 4 is not currently used by linux.
 398          * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
 399          * Way 5 shall be flushed and way 6 shall be set to identity mapping
 400          * on MMUv3.
 401          */
 402         local_flush_tlb_all();
 403         invalidate_page_directory();
 404 #if XCHAL_HAVE_SPANNING_WAY
 405         /* MMU v3 */
 406         {
 407                 unsigned long vaddr = (unsigned long)cpu_reset;
 408                 unsigned long paddr = __pa(vaddr);
 409                 unsigned long tmpaddr = vaddr + SZ_512M;
 410                 unsigned long tmp0, tmp1, tmp2, tmp3;
 411
 412                 /*
 413                  * Find a place for the temporary mapping. It must not be
 414                  * in the same 512MB region with vaddr or paddr, otherwise
 415                  * there may be multihit exception either on entry to the
 416                  * temporary mapping, or on entry to the identity mapping.
 417                  * (512MB is the biggest page size supported by TLB.)
 418                  */
 419                 while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
 420                         tmpaddr += SZ_512M;
 421
 422                 /* Invalidate mapping in the selected temporary area */
 423                 if (itlb_probe(tmpaddr) & BIT(ITLB_HIT_BIT))
 424                         invalidate_itlb_entry(itlb_probe(tmpaddr));
 425                 if (itlb_probe(tmpaddr + PAGE_SIZE) & BIT(ITLB_HIT_BIT))
 426                         invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));
 427
 428                 /*
 429                  * Map two consecutive pages starting at the physical address
 430                  * of this function to the temporary mapping area.
 431                  */
 432                 write_itlb_entry(__pte((paddr & PAGE_MASK) |
 433                                        _PAGE_HW_VALID |
 434                                        _PAGE_HW_EXEC |
 435                                        _PAGE_CA_BYPASS),
 436                                  tmpaddr & PAGE_MASK);
 437                 write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
 438                                        _PAGE_HW_VALID |
 439                                        _PAGE_HW_EXEC |
 440                                        _PAGE_CA_BYPASS),
 441                                  (tmpaddr & PAGE_MASK) + PAGE_SIZE);
 442
 443                 /* Reinitialize TLB */
 444                 __asm__ __volatile__ ("movi     %0, 1f\n\t"
 445                                       "movi     %3, 2f\n\t"
 446                                       "add      %0, %0, %4\n\t"
 447                                       "add      %3, %3, %5\n\t"
 448                                       "jx       %0\n"
 449                                       /*
 450                                        * No literal, data or stack access
 451                                        * below this point
 452                                        */
 453                                       "1:\n\t"
 454                                       /* Initialize *tlbcfg */
 455                                       "movi     %0, 0\n\t"
 456                                       "wsr      %0, itlbcfg\n\t"
 457                                       "wsr      %0, dtlbcfg\n\t"
 458                                       /* Invalidate TLB way 5 */
 459                                       "movi     %0, 4\n\t"
 460                                       "movi     %1, 5\n"
 461                                       "1:\n\t"
 462                                       "iitlb    %1\n\t"
 463                                       "idtlb    %1\n\t"
 464                                       "add      %1, %1, %6\n\t"
 465                                       "addi     %0, %0, -1\n\t"
 466                                       "bnez     %0, 1b\n\t"
 467                                       /* Initialize TLB way 6 */
 468                                       "movi     %0, 7\n\t"
 469                                       "addi     %1, %9, 3\n\t"
 470                                       "addi     %2, %9, 6\n"
 471                                       "1:\n\t"
 472                                       "witlb    %1, %2\n\t"
 473                                       "wdtlb    %1, %2\n\t"
 474                                       "add      %1, %1, %7\n\t"
 475                                       "add      %2, %2, %7\n\t"
 476                                       "addi     %0, %0, -1\n\t"
 477                                       "bnez     %0, 1b\n\t"
 478                                       "isync\n\t"
 479                                       /* Jump to identity mapping */
 480                                       "jx       %3\n"
 481                                       "2:\n\t"
 482                                       /* Complete way 6 initialization */
 483                                       "witlb    %1, %2\n\t"
 484                                       "wdtlb    %1, %2\n\t"
 485                                       /* Invalidate temporary mapping */
 486                                       "sub      %0, %9, %7\n\t"
 487                                       "iitlb    %0\n\t"
 488                                       "add      %0, %0, %8\n\t"
 489                                       "iitlb    %0"
 490                                       : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
 491                                         "=&a"(tmp3)
 492                                       : "a"(tmpaddr - vaddr),
 493                                         "a"(paddr - vaddr),
 494                                         "a"(SZ_128M), "a"(SZ_512M),
 495                                         "a"(PAGE_SIZE),
 496                                         "a"((tmpaddr + SZ_512M) & PAGE_MASK)
 497                                       : "memory");
 498         }
 499 #endif
 500 #endif
 501         __asm__ __volatile__ ("movi     a2, 0\n\t"
 502                               "wsr      a2, icountlevel\n\t"
 503                               "movi     a2, 0\n\t"
 504                               "wsr      a2, icount\n\t"
 505 #if XCHAL_NUM_IBREAK > 0
 506                               "wsr      a2, ibreakenable\n\t"
 507 #endif
 508 #if XCHAL_HAVE_LOOPS
 509                               "wsr      a2, lcount\n\t"
 510 #endif
 511                               "movi     a2, 0x1f\n\t"
 512                               "wsr      a2, ps\n\t"
 513                               "isync\n\t"
 514                               "jx       %0\n\t"
 515                               :
 516                               : "a" (XCHAL_RESET_VECTOR_VADDR)
 517                               : "a2");
 518         for (;;)
 519                 ;
 520 }
 521
 522 void machine_restart(char * cmd)
 523 {
 524         local_irq_disable();
 525         smp_send_stop();
 526         do_kernel_restart(cmd);
 527         pr_err("Reboot failed -- System halted\n");
 528         while (1)
 529                 cpu_relax();
 530 }
 531
 532 void machine_halt(void)
 533 {
 534         local_irq_disable();
 535         smp_send_stop();
 536         do_kernel_power_off();
 537         while (1)
 538                 cpu_relax();
 539 }
 540
 541 void machine_power_off(void)
 542 {
 543         local_irq_disable();
 544         smp_send_stop();
 545         do_kernel_power_off();
 546         while (1)
 547                 cpu_relax();
 548 }
 549 #ifdef CONFIG_PROC_FS
 550
 551 /*
 552  * Display some core information through /proc/cpuinfo.
 553  */
 554
 555 static int
 556 c_show(struct seq_file *f, void *slot)
 557 {
 558         /* high-level stuff */
 559         seq_printf(f, "CPU count\t: %u\n"
 560                       "CPU list\t: %*pbl\n"
 561                       "vendor_id\t: Tensilica\n"
 562                       "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
 563                       "core ID\t\t: " XCHAL_CORE_ID "\n"
 564                       "build ID\t: 0x%x\n"
 565                       "config ID\t: %08x:%08x\n"
 566                       "byte order\t: %s\n"
 567                       "cpu MHz\t\t: %lu.%02lu\n"
 568                       "bogomips\t: %lu.%02lu\n",
 569                       num_online_cpus(),
 570                       cpumask_pr_args(cpu_online_mask),
 571                       XCHAL_BUILD_UNIQUE_ID,
 572                       xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE),
 573                       XCHAL_HAVE_BE ?  "big" : "little",
 574                       ccount_freq/1000000,
 575                       (ccount_freq/10000) % 100,
 576                       loops_per_jiffy/(500000/HZ),
 577                       (loops_per_jiffy/(5000/HZ)) % 100);
 578         seq_puts(f, "flags\t\t: "
 579 #if XCHAL_HAVE_NMI
 580                      "nmi "
 581 #endif
 582 #if XCHAL_HAVE_DEBUG
 583                      "debug "
 584 # if XCHAL_HAVE_OCD
 585                      "ocd "
 586 # endif
 587 #if XCHAL_HAVE_TRAX
 588                      "trax "
 589 #endif
 590 #if XCHAL_NUM_PERF_COUNTERS
 591                      "perf "
 592 #endif
 593 #endif
 594 #if XCHAL_HAVE_DENSITY
 595                      "density "
 596 #endif
 597 #if XCHAL_HAVE_BOOLEANS
 598                      "boolean "
 599 #endif
 600 #if XCHAL_HAVE_LOOPS
 601                      "loop "
 602 #endif
 603 #if XCHAL_HAVE_NSA
 604                      "nsa "
 605 #endif
 606 #if XCHAL_HAVE_MINMAX
 607                      "minmax "
 608 #endif
 609 #if XCHAL_HAVE_SEXT
 610                      "sext "
 611 #endif
 612 #if XCHAL_HAVE_CLAMPS
 613                      "clamps "
 614 #endif
 615 #if XCHAL_HAVE_MAC16
 616                      "mac16 "
 617 #endif
 618 #if XCHAL_HAVE_MUL16
 619                      "mul16 "
 620 #endif
 621 #if XCHAL_HAVE_MUL32
 622                      "mul32 "
 623 #endif
 624 #if XCHAL_HAVE_MUL32_HIGH
 625                      "mul32h "
 626 #endif
 627 #if XCHAL_HAVE_FP
 628                      "fpu "
 629 #endif
 630 #if XCHAL_HAVE_S32C1I
 631                      "s32c1i "
 632 #endif
 633 #if XCHAL_HAVE_EXCLUSIVE
 634                      "exclusive "
 635 #endif
 636                      "\n");
 637
 638         /* Registers. */
 639         seq_printf(f,"physical aregs\t: %d\n"
 640                      "misc regs\t: %d\n"
 641                      "ibreak\t\t: %d\n"
 642                      "dbreak\t\t: %d\n"
 643                      "perf counters\t: %d\n",
 644                      XCHAL_NUM_AREGS,
 645                      XCHAL_NUM_MISC_REGS,
 646                      XCHAL_NUM_IBREAK,
 647                      XCHAL_NUM_DBREAK,
 648                      XCHAL_NUM_PERF_COUNTERS);
 649
 650
 651         /* Interrupt. */
 652         seq_printf(f,"num ints\t: %d\n"
 653                      "ext ints\t: %d\n"
 654                      "int levels\t: %d\n"
 655                      "timers\t\t: %d\n"
 656                      "debug level\t: %d\n",
 657                      XCHAL_NUM_INTERRUPTS,
 658                      XCHAL_NUM_EXTINTERRUPTS,
 659                      XCHAL_NUM_INTLEVELS,
 660                      XCHAL_NUM_TIMERS,
 661                      XCHAL_DEBUGLEVEL);
 662
 663         /* Cache */
 664         seq_printf(f,"icache line size: %d\n"
 665                      "icache ways\t: %d\n"
 666                      "icache size\t: %d\n"
 667                      "icache flags\t: "
 668 #if XCHAL_ICACHE_LINE_LOCKABLE
 669                      "lock "
 670 #endif
 671                      "\n"
 672                      "dcache line size: %d\n"
 673                      "dcache ways\t: %d\n"
 674                      "dcache size\t: %d\n"
 675                      "dcache flags\t: "
 676 #if XCHAL_DCACHE_IS_WRITEBACK
 677                      "writeback "
 678 #endif
 679 #if XCHAL_DCACHE_LINE_LOCKABLE
 680                      "lock "
 681 #endif
 682                      "\n",
 683                      XCHAL_ICACHE_LINESIZE,
 684                      XCHAL_ICACHE_WAYS,
 685                      XCHAL_ICACHE_SIZE,
 686                      XCHAL_DCACHE_LINESIZE,
 687                      XCHAL_DCACHE_WAYS,
 688                      XCHAL_DCACHE_SIZE);
 689
 690         return 0;
 691 }
 692
 693 /*
 694  * We show only CPU #0 info.
 695  */
 696 static void *
 697 c_start(struct seq_file *f, loff_t *pos)
 698 {
 699         return (*pos == 0) ? (void *)1 : NULL;
 700 }
 701
 702 static void *
 703 c_next(struct seq_file *f, void *v, loff_t *pos)
 704 {
 705         ++*pos;
 706         return c_start(f, pos);
 707 }
 708
 709 static void
 710 c_stop(struct seq_file *f, void *v)
 711 {
 712 }
 713
 714 const struct seq_operations cpuinfo_op =
 715 {
 716         .start  = c_start,
 717         .next   = c_next,
 718         .stop   = c_stop,
 719         .show   = c_show,
 720 };
 721
 722 #endif /* CONFIG_PROC_FS */