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/screen_info.h>
  23 #include <linux/kernel.h>
  24 #include <linux/percpu.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/pgtable.h>
  41 #include <asm/processor.h>
  42 #include <asm/timex.h>
  43 #include <asm/platform.h>
  44 #include <asm/page.h>
  45 #include <asm/setup.h>
  46 #include <asm/param.h>
  47 #include <asm/smp.h>
  48 #include <asm/sysmem.h>
  49
  50 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE)
  51 struct screen_info screen_info = {
  52         .orig_x = 0,
  53         .orig_y = 24,
  54         .orig_video_cols = 80,
  55         .orig_video_lines = 24,
  56         .orig_video_isVGA = 1,
  57         .orig_video_points = 16,
  58 };
  59 #endif
  60
  61 #ifdef CONFIG_BLK_DEV_INITRD
  62 extern unsigned long initrd_start;
  63 extern unsigned long initrd_end;
  64 int initrd_is_mapped = 0;
  65 extern int initrd_below_start_ok;
  66 #endif
  67
  68 #ifdef CONFIG_OF
  69 void *dtb_start = __dtb_start;
  70 #endif
  71
  72 extern unsigned long loops_per_jiffy;
  73
  74 /* Command line specified as configuration option. */
  75
  76 static char __initdata command_line[COMMAND_LINE_SIZE];
  77
  78 #ifdef CONFIG_CMDLINE_BOOL
  79 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE;
  80 #endif
  81
  82 #ifdef CONFIG_PARSE_BOOTPARAM
  83 /*
  84  * Boot parameter parsing.
  85  *
  86  * The Xtensa port uses a list of variable-sized tags to pass data to
  87  * the kernel. The first tag must be a BP_TAG_FIRST tag for the list
  88  * to be recognised. The list is terminated with a zero-sized
  89  * BP_TAG_LAST tag.
  90  */
  91
  92 typedef struct tagtable {
  93         u32 tag;
  94         int (*parse)(const bp_tag_t*);
  95 } tagtable_t;
  96
  97 #define __tagtable(tag, fn) static tagtable_t __tagtable_##fn           \
  98         __attribute__((used, section(".taglist"))) = { tag, fn }
  99
 100 /* parse current tag */
 101
 102 static int __init parse_tag_mem(const bp_tag_t *tag)
 103 {
 104         struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
 105
 106         if (mi->type != MEMORY_TYPE_CONVENTIONAL)
 107                 return -1;
 108
 109         return memblock_add(mi->start, mi->end - mi->start);
 110 }
 111
 112 __tagtable(BP_TAG_MEMORY, parse_tag_mem);
 113
 114 #ifdef CONFIG_BLK_DEV_INITRD
 115
 116 static int __init parse_tag_initrd(const bp_tag_t* tag)
 117 {
 118         struct bp_meminfo *mi = (struct bp_meminfo *)(tag->data);
 119
 120         initrd_start = (unsigned long)__va(mi->start);
 121         initrd_end = (unsigned long)__va(mi->end);
 122
 123         return 0;
 124 }
 125
 126 __tagtable(BP_TAG_INITRD, parse_tag_initrd);
 127
 128 #endif /* CONFIG_BLK_DEV_INITRD */
 129
 130 #ifdef CONFIG_OF
 131
 132 static int __init parse_tag_fdt(const bp_tag_t *tag)
 133 {
 134         dtb_start = __va(tag->data[0]);
 135         return 0;
 136 }
 137
 138 __tagtable(BP_TAG_FDT, parse_tag_fdt);
 139
 140 #endif /* CONFIG_OF */
 141
 142 static int __init parse_tag_cmdline(const bp_tag_t* tag)
 143 {
 144         strlcpy(command_line, (char *)(tag->data), COMMAND_LINE_SIZE);
 145         return 0;
 146 }
 147
 148 __tagtable(BP_TAG_COMMAND_LINE, parse_tag_cmdline);
 149
 150 static int __init parse_bootparam(const bp_tag_t* tag)
 151 {
 152         extern tagtable_t __tagtable_begin, __tagtable_end;
 153         tagtable_t *t;
 154
 155         /* Boot parameters must start with a BP_TAG_FIRST tag. */
 156
 157         if (tag->id != BP_TAG_FIRST) {
 158                 pr_warn("Invalid boot parameters!\n");
 159                 return 0;
 160         }
 161
 162         tag = (bp_tag_t*)((unsigned long)tag + sizeof(bp_tag_t) + tag->size);
 163
 164         /* Parse all tags. */
 165
 166         while (tag != NULL && tag->id != BP_TAG_LAST) {
 167                 for (t = &__tagtable_begin; t < &__tagtable_end; t++) {
 168                         if (tag->id == t->tag) {
 169                                 t->parse(tag);
 170                                 break;
 171                         }
 172                 }
 173                 if (t == &__tagtable_end)
 174                         pr_warn("Ignoring tag 0x%08x\n", tag->id);
 175                 tag = (bp_tag_t*)((unsigned long)(tag + 1) + tag->size);
 176         }
 177
 178         return 0;
 179 }
 180 #else
 181 static int __init parse_bootparam(const bp_tag_t *tag)
 182 {
 183         pr_info("Ignoring boot parameters at %p\n", tag);
 184         return 0;
 185 }
 186 #endif
 187
 188 #ifdef CONFIG_OF
 189
 190 #if !XCHAL_HAVE_PTP_MMU || XCHAL_HAVE_SPANNING_WAY
 191 unsigned long xtensa_kio_paddr = XCHAL_KIO_DEFAULT_PADDR;
 192 EXPORT_SYMBOL(xtensa_kio_paddr);
 193
 194 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 195                 int depth, void *data)
 196 {
 197         const __be32 *ranges;
 198         int len;
 199
 200         if (depth > 1)
 201                 return 0;
 202
 203         if (!of_flat_dt_is_compatible(node, "simple-bus"))
 204                 return 0;
 205
 206         ranges = of_get_flat_dt_prop(node, "ranges", &len);
 207         if (!ranges)
 208                 return 1;
 209         if (len == 0)
 210                 return 1;
 211
 212         xtensa_kio_paddr = of_read_ulong(ranges+1, 1);
 213         /* round down to nearest 256MB boundary */
 214         xtensa_kio_paddr &= 0xf0000000;
 215
 216         init_kio();
 217
 218         return 1;
 219 }
 220 #else
 221 static int __init xtensa_dt_io_area(unsigned long node, const char *uname,
 222                 int depth, void *data)
 223 {
 224         return 1;
 225 }
 226 #endif
 227
 228 void __init early_init_devtree(void *params)
 229 {
 230         early_init_dt_scan(params);
 231         of_scan_flat_dt(xtensa_dt_io_area, NULL);
 232
 233         if (!command_line[0])
 234                 strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
 235 }
 236
 237 #endif /* CONFIG_OF */
 238
 239 /*
 240  * Initialize architecture. (Early stage)
 241  */
 242
 243 void __init init_arch(bp_tag_t *bp_start)
 244 {
 245         /* Initialize MMU. */
 246
 247         init_mmu();
 248
 249         /* Initialize initial KASAN shadow map */
 250
 251         kasan_early_init();
 252
 253         /* Parse boot parameters */
 254
 255         if (bp_start)
 256                 parse_bootparam(bp_start);
 257
 258 #ifdef CONFIG_OF
 259         early_init_devtree(dtb_start);
 260 #endif
 261
 262 #ifdef CONFIG_CMDLINE_BOOL
 263         if (!command_line[0])
 264                 strlcpy(command_line, default_command_line, COMMAND_LINE_SIZE);
 265 #endif
 266
 267         /* Early hook for platforms */
 268
 269         platform_init(bp_start);
 270 }
 271
 272 /*
 273  * Initialize system. Setup memory and reserve regions.
 274  */
 275
 276 extern char _end[];
 277 extern char _stext[];
 278 extern char _WindowVectors_text_start;
 279 extern char _WindowVectors_text_end;
 280 extern char _DebugInterruptVector_text_start;
 281 extern char _DebugInterruptVector_text_end;
 282 extern char _KernelExceptionVector_text_start;
 283 extern char _KernelExceptionVector_text_end;
 284 extern char _UserExceptionVector_text_start;
 285 extern char _UserExceptionVector_text_end;
 286 extern char _DoubleExceptionVector_text_start;
 287 extern char _DoubleExceptionVector_text_end;
 288 #if XCHAL_EXCM_LEVEL >= 2
 289 extern char _Level2InterruptVector_text_start;
 290 extern char _Level2InterruptVector_text_end;
 291 #endif
 292 #if XCHAL_EXCM_LEVEL >= 3
 293 extern char _Level3InterruptVector_text_start;
 294 extern char _Level3InterruptVector_text_end;
 295 #endif
 296 #if XCHAL_EXCM_LEVEL >= 4
 297 extern char _Level4InterruptVector_text_start;
 298 extern char _Level4InterruptVector_text_end;
 299 #endif
 300 #if XCHAL_EXCM_LEVEL >= 5
 301 extern char _Level5InterruptVector_text_start;
 302 extern char _Level5InterruptVector_text_end;
 303 #endif
 304 #if XCHAL_EXCM_LEVEL >= 6
 305 extern char _Level6InterruptVector_text_start;
 306 extern char _Level6InterruptVector_text_end;
 307 #endif
 308 #ifdef CONFIG_SMP
 309 extern char _SecondaryResetVector_text_start;
 310 extern char _SecondaryResetVector_text_end;
 311 #endif
 312
 313 static inline int __init_memblock mem_reserve(unsigned long start,
 314                                               unsigned long end)
 315 {
 316         return memblock_reserve(start, end - start);
 317 }
 318
 319 void __init setup_arch(char **cmdline_p)
 320 {
 321         pr_info("config ID: %08x:%08x\n",
 322                 xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE));
 323         if (xtensa_get_sr(SREG_EPC) != XCHAL_HW_CONFIGID0 ||
 324             xtensa_get_sr(SREG_EXCSAVE) != XCHAL_HW_CONFIGID1)
 325                 pr_info("built for config ID: %08x:%08x\n",
 326                         XCHAL_HW_CONFIGID0, XCHAL_HW_CONFIGID1);
 327
 328         *cmdline_p = command_line;
 329         platform_setup(cmdline_p);
 330         strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
 331
 332         /* Reserve some memory regions */
 333
 334 #ifdef CONFIG_BLK_DEV_INITRD
 335         if (initrd_start < initrd_end) {
 336                 initrd_is_mapped = mem_reserve(__pa(initrd_start),
 337                                                __pa(initrd_end)) == 0;
 338                 initrd_below_start_ok = 1;
 339         } else {
 340                 initrd_start = 0;
 341         }
 342 #endif
 343
 344         mem_reserve(__pa(_stext), __pa(_end));
 345
 346 #ifdef CONFIG_VECTORS_OFFSET
 347         mem_reserve(__pa(&_WindowVectors_text_start),
 348                     __pa(&_WindowVectors_text_end));
 349
 350         mem_reserve(__pa(&_DebugInterruptVector_text_start),
 351                     __pa(&_DebugInterruptVector_text_end));
 352
 353         mem_reserve(__pa(&_KernelExceptionVector_text_start),
 354                     __pa(&_KernelExceptionVector_text_end));
 355
 356         mem_reserve(__pa(&_UserExceptionVector_text_start),
 357                     __pa(&_UserExceptionVector_text_end));
 358
 359         mem_reserve(__pa(&_DoubleExceptionVector_text_start),
 360                     __pa(&_DoubleExceptionVector_text_end));
 361
 362 #if XCHAL_EXCM_LEVEL >= 2
 363         mem_reserve(__pa(&_Level2InterruptVector_text_start),
 364                     __pa(&_Level2InterruptVector_text_end));
 365 #endif
 366 #if XCHAL_EXCM_LEVEL >= 3
 367         mem_reserve(__pa(&_Level3InterruptVector_text_start),
 368                     __pa(&_Level3InterruptVector_text_end));
 369 #endif
 370 #if XCHAL_EXCM_LEVEL >= 4
 371         mem_reserve(__pa(&_Level4InterruptVector_text_start),
 372                     __pa(&_Level4InterruptVector_text_end));
 373 #endif
 374 #if XCHAL_EXCM_LEVEL >= 5
 375         mem_reserve(__pa(&_Level5InterruptVector_text_start),
 376                     __pa(&_Level5InterruptVector_text_end));
 377 #endif
 378 #if XCHAL_EXCM_LEVEL >= 6
 379         mem_reserve(__pa(&_Level6InterruptVector_text_start),
 380                     __pa(&_Level6InterruptVector_text_end));
 381 #endif
 382
 383 #endif /* CONFIG_VECTORS_OFFSET */
 384
 385 #ifdef CONFIG_SMP
 386         mem_reserve(__pa(&_SecondaryResetVector_text_start),
 387                     __pa(&_SecondaryResetVector_text_end));
 388 #endif
 389         parse_early_param();
 390         bootmem_init();
 391         kasan_init();
 392         unflatten_and_copy_device_tree();
 393
 394 #ifdef CONFIG_SMP
 395         smp_init_cpus();
 396 #endif
 397
 398         paging_init();
 399         zones_init();
 400
 401 #ifdef CONFIG_VT
 402 # if defined(CONFIG_VGA_CONSOLE)
 403         conswitchp = &vga_con;
 404 # elif defined(CONFIG_DUMMY_CONSOLE)
 405         conswitchp = &dummy_con;
 406 # endif
 407 #endif
 408 }
 409
 410 static DEFINE_PER_CPU(struct cpu, cpu_data);
 411
 412 static int __init topology_init(void)
 413 {
 414         int i;
 415
 416         for_each_possible_cpu(i) {
 417                 struct cpu *cpu = &per_cpu(cpu_data, i);
 418                 cpu->hotpluggable = !!i;
 419                 register_cpu(cpu, i);
 420         }
 421
 422         return 0;
 423 }
 424 subsys_initcall(topology_init);
 425
 426 void cpu_reset(void)
 427 {
 428 #if XCHAL_HAVE_PTP_MMU && IS_ENABLED(CONFIG_MMU)
 429         local_irq_disable();
 430         /*
 431          * We have full MMU: all autoload ways, ways 7, 8 and 9 of DTLB must
 432          * be flushed.
 433          * Way 4 is not currently used by linux.
 434          * Ways 5 and 6 shall not be touched on MMUv2 as they are hardwired.
 435          * Way 5 shall be flushed and way 6 shall be set to identity mapping
 436          * on MMUv3.
 437          */
 438         local_flush_tlb_all();
 439         invalidate_page_directory();
 440 #if XCHAL_HAVE_SPANNING_WAY
 441         /* MMU v3 */
 442         {
 443                 unsigned long vaddr = (unsigned long)cpu_reset;
 444                 unsigned long paddr = __pa(vaddr);
 445                 unsigned long tmpaddr = vaddr + SZ_512M;
 446                 unsigned long tmp0, tmp1, tmp2, tmp3;
 447
 448                 /*
 449                  * Find a place for the temporary mapping. It must not be
 450                  * in the same 512MB region with vaddr or paddr, otherwise
 451                  * there may be multihit exception either on entry to the
 452                  * temporary mapping, or on entry to the identity mapping.
 453                  * (512MB is the biggest page size supported by TLB.)
 454                  */
 455                 while (((tmpaddr ^ paddr) & -SZ_512M) == 0)
 456                         tmpaddr += SZ_512M;
 457
 458                 /* Invalidate mapping in the selected temporary area */
 459                 if (itlb_probe(tmpaddr) & BIT(ITLB_HIT_BIT))
 460                         invalidate_itlb_entry(itlb_probe(tmpaddr));
 461                 if (itlb_probe(tmpaddr + PAGE_SIZE) & BIT(ITLB_HIT_BIT))
 462                         invalidate_itlb_entry(itlb_probe(tmpaddr + PAGE_SIZE));
 463
 464                 /*
 465                  * Map two consecutive pages starting at the physical address
 466                  * of this function to the temporary mapping area.
 467                  */
 468                 write_itlb_entry(__pte((paddr & PAGE_MASK) |
 469                                        _PAGE_HW_VALID |
 470                                        _PAGE_HW_EXEC |
 471                                        _PAGE_CA_BYPASS),
 472                                  tmpaddr & PAGE_MASK);
 473                 write_itlb_entry(__pte(((paddr & PAGE_MASK) + PAGE_SIZE) |
 474                                        _PAGE_HW_VALID |
 475                                        _PAGE_HW_EXEC |
 476                                        _PAGE_CA_BYPASS),
 477                                  (tmpaddr & PAGE_MASK) + PAGE_SIZE);
 478
 479                 /* Reinitialize TLB */
 480                 __asm__ __volatile__ ("movi     %0, 1f\n\t"
 481                                       "movi     %3, 2f\n\t"
 482                                       "add      %0, %0, %4\n\t"
 483                                       "add      %3, %3, %5\n\t"
 484                                       "jx       %0\n"
 485                                       /*
 486                                        * No literal, data or stack access
 487                                        * below this point
 488                                        */
 489                                       "1:\n\t"
 490                                       /* Initialize *tlbcfg */
 491                                       "movi     %0, 0\n\t"
 492                                       "wsr      %0, itlbcfg\n\t"
 493                                       "wsr      %0, dtlbcfg\n\t"
 494                                       /* Invalidate TLB way 5 */
 495                                       "movi     %0, 4\n\t"
 496                                       "movi     %1, 5\n"
 497                                       "1:\n\t"
 498                                       "iitlb    %1\n\t"
 499                                       "idtlb    %1\n\t"
 500                                       "add      %1, %1, %6\n\t"
 501                                       "addi     %0, %0, -1\n\t"
 502                                       "bnez     %0, 1b\n\t"
 503                                       /* Initialize TLB way 6 */
 504                                       "movi     %0, 7\n\t"
 505                                       "addi     %1, %9, 3\n\t"
 506                                       "addi     %2, %9, 6\n"
 507                                       "1:\n\t"
 508                                       "witlb    %1, %2\n\t"
 509                                       "wdtlb    %1, %2\n\t"
 510                                       "add      %1, %1, %7\n\t"
 511                                       "add      %2, %2, %7\n\t"
 512                                       "addi     %0, %0, -1\n\t"
 513                                       "bnez     %0, 1b\n\t"
 514                                       "isync\n\t"
 515                                       /* Jump to identity mapping */
 516                                       "jx       %3\n"
 517                                       "2:\n\t"
 518                                       /* Complete way 6 initialization */
 519                                       "witlb    %1, %2\n\t"
 520                                       "wdtlb    %1, %2\n\t"
 521                                       /* Invalidate temporary mapping */
 522                                       "sub      %0, %9, %7\n\t"
 523                                       "iitlb    %0\n\t"
 524                                       "add      %0, %0, %8\n\t"
 525                                       "iitlb    %0"
 526                                       : "=&a"(tmp0), "=&a"(tmp1), "=&a"(tmp2),
 527                                         "=&a"(tmp3)
 528                                       : "a"(tmpaddr - vaddr),
 529                                         "a"(paddr - vaddr),
 530                                         "a"(SZ_128M), "a"(SZ_512M),
 531                                         "a"(PAGE_SIZE),
 532                                         "a"((tmpaddr + SZ_512M) & PAGE_MASK)
 533                                       : "memory");
 534         }
 535 #endif
 536 #endif
 537         __asm__ __volatile__ ("movi     a2, 0\n\t"
 538                               "wsr      a2, icountlevel\n\t"
 539                               "movi     a2, 0\n\t"
 540                               "wsr      a2, icount\n\t"
 541 #if XCHAL_NUM_IBREAK > 0
 542                               "wsr      a2, ibreakenable\n\t"
 543 #endif
 544 #if XCHAL_HAVE_LOOPS
 545                               "wsr      a2, lcount\n\t"
 546 #endif
 547                               "movi     a2, 0x1f\n\t"
 548                               "wsr      a2, ps\n\t"
 549                               "isync\n\t"
 550                               "jx       %0\n\t"
 551                               :
 552                               : "a" (XCHAL_RESET_VECTOR_VADDR)
 553                               : "a2");
 554         for (;;)
 555                 ;
 556 }
 557
 558 void machine_restart(char * cmd)
 559 {
 560         platform_restart();
 561 }
 562
 563 void machine_halt(void)
 564 {
 565         platform_halt();
 566         while (1);
 567 }
 568
 569 void machine_power_off(void)
 570 {
 571         platform_power_off();
 572         while (1);
 573 }
 574 #ifdef CONFIG_PROC_FS
 575
 576 /*
 577  * Display some core information through /proc/cpuinfo.
 578  */
 579
 580 static int
 581 c_show(struct seq_file *f, void *slot)
 582 {
 583         /* high-level stuff */
 584         seq_printf(f, "CPU count\t: %u\n"
 585                       "CPU list\t: %*pbl\n"
 586                       "vendor_id\t: Tensilica\n"
 587                       "model\t\t: Xtensa " XCHAL_HW_VERSION_NAME "\n"
 588                       "core ID\t\t: " XCHAL_CORE_ID "\n"
 589                       "build ID\t: 0x%x\n"
 590                       "config ID\t: %08x:%08x\n"
 591                       "byte order\t: %s\n"
 592                       "cpu MHz\t\t: %lu.%02lu\n"
 593                       "bogomips\t: %lu.%02lu\n",
 594                       num_online_cpus(),
 595                       cpumask_pr_args(cpu_online_mask),
 596                       XCHAL_BUILD_UNIQUE_ID,
 597                       xtensa_get_sr(SREG_EPC), xtensa_get_sr(SREG_EXCSAVE),
 598                       XCHAL_HAVE_BE ?  "big" : "little",
 599                       ccount_freq/1000000,
 600                       (ccount_freq/10000) % 100,
 601                       loops_per_jiffy/(500000/HZ),
 602                       (loops_per_jiffy/(5000/HZ)) % 100);
 603         seq_puts(f, "flags\t\t: "
 604 #if XCHAL_HAVE_NMI
 605                      "nmi "
 606 #endif
 607 #if XCHAL_HAVE_DEBUG
 608                      "debug "
 609 # if XCHAL_HAVE_OCD
 610                      "ocd "
 611 # endif
 612 #endif
 613 #if XCHAL_HAVE_DENSITY
 614                      "density "
 615 #endif
 616 #if XCHAL_HAVE_BOOLEANS
 617                      "boolean "
 618 #endif
 619 #if XCHAL_HAVE_LOOPS
 620                      "loop "
 621 #endif
 622 #if XCHAL_HAVE_NSA
 623                      "nsa "
 624 #endif
 625 #if XCHAL_HAVE_MINMAX
 626                      "minmax "
 627 #endif
 628 #if XCHAL_HAVE_SEXT
 629                      "sext "
 630 #endif
 631 #if XCHAL_HAVE_CLAMPS
 632                      "clamps "
 633 #endif
 634 #if XCHAL_HAVE_MAC16
 635                      "mac16 "
 636 #endif
 637 #if XCHAL_HAVE_MUL16
 638                      "mul16 "
 639 #endif
 640 #if XCHAL_HAVE_MUL32
 641                      "mul32 "
 642 #endif
 643 #if XCHAL_HAVE_MUL32_HIGH
 644                      "mul32h "
 645 #endif
 646 #if XCHAL_HAVE_FP
 647                      "fpu "
 648 #endif
 649 #if XCHAL_HAVE_S32C1I
 650                      "s32c1i "
 651 #endif
 652 #if XCHAL_HAVE_EXCLUSIVE
 653                      "exclusive "
 654 #endif
 655                      "\n");
 656
 657         /* Registers. */
 658         seq_printf(f,"physical aregs\t: %d\n"
 659                      "misc regs\t: %d\n"
 660                      "ibreak\t\t: %d\n"
 661                      "dbreak\t\t: %d\n",
 662                      XCHAL_NUM_AREGS,
 663                      XCHAL_NUM_MISC_REGS,
 664                      XCHAL_NUM_IBREAK,
 665                      XCHAL_NUM_DBREAK);
 666
 667
 668         /* Interrupt. */
 669         seq_printf(f,"num ints\t: %d\n"
 670                      "ext ints\t: %d\n"
 671                      "int levels\t: %d\n"
 672                      "timers\t\t: %d\n"
 673                      "debug level\t: %d\n",
 674                      XCHAL_NUM_INTERRUPTS,
 675                      XCHAL_NUM_EXTINTERRUPTS,
 676                      XCHAL_NUM_INTLEVELS,
 677                      XCHAL_NUM_TIMERS,
 678                      XCHAL_DEBUGLEVEL);
 679
 680         /* Cache */
 681         seq_printf(f,"icache line size: %d\n"
 682                      "icache ways\t: %d\n"
 683                      "icache size\t: %d\n"
 684                      "icache flags\t: "
 685 #if XCHAL_ICACHE_LINE_LOCKABLE
 686                      "lock "
 687 #endif
 688                      "\n"
 689                      "dcache line size: %d\n"
 690                      "dcache ways\t: %d\n"
 691                      "dcache size\t: %d\n"
 692                      "dcache flags\t: "
 693 #if XCHAL_DCACHE_IS_WRITEBACK
 694                      "writeback "
 695 #endif
 696 #if XCHAL_DCACHE_LINE_LOCKABLE
 697                      "lock "
 698 #endif
 699                      "\n",
 700                      XCHAL_ICACHE_LINESIZE,
 701                      XCHAL_ICACHE_WAYS,
 702                      XCHAL_ICACHE_SIZE,
 703                      XCHAL_DCACHE_LINESIZE,
 704                      XCHAL_DCACHE_WAYS,
 705                      XCHAL_DCACHE_SIZE);
 706
 707         return 0;
 708 }
 709
 710 /*
 711  * We show only CPU #0 info.
 712  */
 713 static void *
 714 c_start(struct seq_file *f, loff_t *pos)
 715 {
 716         return (*pos == 0) ? (void *)1 : NULL;
 717 }
 718
 719 static void *
 720 c_next(struct seq_file *f, void *v, loff_t *pos)
 721 {
 722         return NULL;
 723 }
 724
 725 static void
 726 c_stop(struct seq_file *f, void *v)
 727 {
 728 }
 729
 730 const struct seq_operations cpuinfo_op =
 731 {
 732         .start  = c_start,
 733         .next   = c_next,
 734         .stop   = c_stop,
 735         .show   = c_show,
 736 };
 737
 738 #endif /* CONFIG_PROC_FS */