arch/sparc/kernel/setup_64.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  *  linux/arch/sparc64/kernel/setup.c
   4  *
   5  *  Copyright (C) 1995,1996  David S. Miller ([email protected])
   6  *  Copyright (C) 1997       Jakub Jelinek ([email protected])
   7  */
   8
   9 #include <linux/errno.h>
  10 #include <linux/sched.h>
  11 #include <linux/kernel.h>
  12 #include <linux/mm.h>
  13 #include <linux/stddef.h>
  14 #include <linux/unistd.h>
  15 #include <linux/ptrace.h>
  16 #include <asm/smp.h>
  17 #include <linux/user.h>
  18 #include <linux/screen_info.h>
  19 #include <linux/delay.h>
  20 #include <linux/fs.h>
  21 #include <linux/seq_file.h>
  22 #include <linux/syscalls.h>
  23 #include <linux/kdev_t.h>
  24 #include <linux/major.h>
  25 #include <linux/string.h>
  26 #include <linux/init.h>
  27 #include <linux/inet.h>
  28 #include <linux/console.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/cpu.h>
  32 #include <linux/initrd.h>
  33 #include <linux/module.h>
  34 #include <linux/start_kernel.h>
  35 #include <linux/memblock.h>
  36 #include <uapi/linux/mount.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/processor.h>
  40 #include <asm/oplib.h>
  41 #include <asm/page.h>
  42 #include <asm/idprom.h>
  43 #include <asm/head.h>
  44 #include <asm/starfire.h>
  45 #include <asm/mmu_context.h>
  46 #include <asm/timer.h>
  47 #include <asm/sections.h>
  48 #include <asm/setup.h>
  49 #include <asm/mmu.h>
  50 #include <asm/ns87303.h>
  51 #include <asm/btext.h>
  52 #include <asm/elf.h>
  53 #include <asm/mdesc.h>
  54 #include <asm/cacheflush.h>
  55 #include <asm/dma.h>
  56 #include <asm/irq.h>
  57
  58 #ifdef CONFIG_IP_PNP
  59 #include <net/ipconfig.h>
  60 #endif
  61
  62 #include "entry.h"
  63 #include "kernel.h"
  64
  65 /* Used to synchronize accesses to NatSemi SUPER I/O chip configure
  66  * operations in asm/ns87303.h
  67  */
  68 DEFINE_SPINLOCK(ns87303_lock);
  69 EXPORT_SYMBOL(ns87303_lock);
  70
  71 struct screen_info screen_info = {
  72         0, 0,                   /* orig-x, orig-y */
  73         0,                      /* unused */
  74         0,                      /* orig-video-page */
  75         0,                      /* orig-video-mode */
  76         128,                    /* orig-video-cols */
  77         0, 0, 0,                /* unused, ega_bx, unused */
  78         54,                     /* orig-video-lines */
  79         0,                      /* orig-video-isVGA */
  80         16                      /* orig-video-points */
  81 };
  82
  83 static void
  84 prom_console_write(struct console *con, const char *s, unsigned int n)
  85 {
  86         prom_write(s, n);
  87 }
  88
  89 /* Exported for mm/init.c:paging_init. */
  90 unsigned long cmdline_memory_size = 0;
  91
  92 static struct console prom_early_console = {
  93         .name =         "earlyprom",
  94         .write =        prom_console_write,
  95         .flags =        CON_PRINTBUFFER | CON_BOOT | CON_ANYTIME,
  96         .index =        -1,
  97 };
  98
  99 /*
 100  * Process kernel command line switches that are specific to the
 101  * SPARC or that require special low-level processing.
 102  */
 103 static void __init process_switch(char c)
 104 {
 105         switch (c) {
 106         case 'd':
 107         case 's':
 108                 break;
 109         case 'h':
 110                 prom_printf("boot_flags_init: Halt!\n");
 111                 prom_halt();
 112                 break;
 113         case 'p':
 114                 prom_early_console.flags &= ~CON_BOOT;
 115                 break;
 116         case 'P':
 117                 /* Force UltraSPARC-III P-Cache on. */
 118                 if (tlb_type != cheetah) {
 119                         printk("BOOT: Ignoring P-Cache force option.\n");
 120                         break;
 121                 }
 122                 cheetah_pcache_forced_on = 1;
 123                 add_taint(TAINT_MACHINE_CHECK, LOCKDEP_NOW_UNRELIABLE);
 124                 cheetah_enable_pcache();
 125                 break;
 126
 127         default:
 128                 printk("Unknown boot switch (-%c)\n", c);
 129                 break;
 130         }
 131 }
 132
 133 static void __init boot_flags_init(char *commands)
 134 {
 135         while (*commands) {
 136                 /* Move to the start of the next "argument". */
 137                 while (*commands == ' ')
 138                         commands++;
 139
 140                 /* Process any command switches, otherwise skip it. */
 141                 if (*commands == '\0')
 142                         break;
 143                 if (*commands == '-') {
 144                         commands++;
 145                         while (*commands && *commands != ' ')
 146                                 process_switch(*commands++);
 147                         continue;
 148                 }
 149                 if (!strncmp(commands, "mem=", 4))
 150                         cmdline_memory_size = memparse(commands + 4, &commands);
 151
 152                 while (*commands && *commands != ' ')
 153                         commands++;
 154         }
 155 }
 156
 157 extern unsigned short root_flags;
 158 extern unsigned short root_dev;
 159 extern unsigned short ram_flags;
 160 #define RAMDISK_IMAGE_START_MASK        0x07FF
 161 #define RAMDISK_PROMPT_FLAG             0x8000
 162 #define RAMDISK_LOAD_FLAG               0x4000
 163
 164 extern int root_mountflags;
 165
 166 char reboot_command[COMMAND_LINE_SIZE];
 167
 168 static struct pt_regs fake_swapper_regs = { { 0, }, 0, 0, 0, 0 };
 169
 170 static void __init per_cpu_patch(void)
 171 {
 172         struct cpuid_patch_entry *p;
 173         unsigned long ver;
 174         int is_jbus;
 175
 176         if (tlb_type == spitfire && !this_is_starfire)
 177                 return;
 178
 179         is_jbus = 0;
 180         if (tlb_type != hypervisor) {
 181                 __asm__ ("rdpr %%ver, %0" : "=r" (ver));
 182                 is_jbus = ((ver >> 32UL) == __JALAPENO_ID ||
 183                            (ver >> 32UL) == __SERRANO_ID);
 184         }
 185
 186         p = &__cpuid_patch;
 187         while (p < &__cpuid_patch_end) {
 188                 unsigned long addr = p->addr;
 189                 unsigned int *insns;
 190
 191                 switch (tlb_type) {
 192                 case spitfire:
 193                         insns = &p->starfire[0];
 194                         break;
 195                 case cheetah:
 196                 case cheetah_plus:
 197                         if (is_jbus)
 198                                 insns = &p->cheetah_jbus[0];
 199                         else
 200                                 insns = &p->cheetah_safari[0];
 201                         break;
 202                 case hypervisor:
 203                         insns = &p->sun4v[0];
 204                         break;
 205                 default:
 206                         prom_printf("Unknown cpu type, halting.\n");
 207                         prom_halt();
 208                 }
 209
 210                 *(unsigned int *) (addr +  0) = insns[0];
 211                 wmb();
 212                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 213
 214                 *(unsigned int *) (addr +  4) = insns[1];
 215                 wmb();
 216                 __asm__ __volatile__("flush     %0" : : "r" (addr +  4));
 217
 218                 *(unsigned int *) (addr +  8) = insns[2];
 219                 wmb();
 220                 __asm__ __volatile__("flush     %0" : : "r" (addr +  8));
 221
 222                 *(unsigned int *) (addr + 12) = insns[3];
 223                 wmb();
 224                 __asm__ __volatile__("flush     %0" : : "r" (addr + 12));
 225
 226                 p++;
 227         }
 228 }
 229
 230 void sun4v_patch_1insn_range(struct sun4v_1insn_patch_entry *start,
 231                              struct sun4v_1insn_patch_entry *end)
 232 {
 233         while (start < end) {
 234                 unsigned long addr = start->addr;
 235
 236                 *(unsigned int *) (addr +  0) = start->insn;
 237                 wmb();
 238                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 239
 240                 start++;
 241         }
 242 }
 243
 244 void sun4v_patch_2insn_range(struct sun4v_2insn_patch_entry *start,
 245                              struct sun4v_2insn_patch_entry *end)
 246 {
 247         while (start < end) {
 248                 unsigned long addr = start->addr;
 249
 250                 *(unsigned int *) (addr +  0) = start->insns[0];
 251                 wmb();
 252                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 253
 254                 *(unsigned int *) (addr +  4) = start->insns[1];
 255                 wmb();
 256                 __asm__ __volatile__("flush     %0" : : "r" (addr +  4));
 257
 258                 start++;
 259         }
 260 }
 261
 262 void sun_m7_patch_2insn_range(struct sun4v_2insn_patch_entry *start,
 263                              struct sun4v_2insn_patch_entry *end)
 264 {
 265         while (start < end) {
 266                 unsigned long addr = start->addr;
 267
 268                 *(unsigned int *) (addr +  0) = start->insns[0];
 269                 wmb();
 270                 __asm__ __volatile__("flush     %0" : : "r" (addr +  0));
 271
 272                 *(unsigned int *) (addr +  4) = start->insns[1];
 273                 wmb();
 274                 __asm__ __volatile__("flush     %0" : : "r" (addr +  4));
 275
 276                 start++;
 277         }
 278 }
 279
 280 static void __init sun4v_patch(void)
 281 {
 282         extern void sun4v_hvapi_init(void);
 283
 284         if (tlb_type != hypervisor)
 285                 return;
 286
 287         sun4v_patch_1insn_range(&__sun4v_1insn_patch,
 288                                 &__sun4v_1insn_patch_end);
 289
 290         sun4v_patch_2insn_range(&__sun4v_2insn_patch,
 291                                 &__sun4v_2insn_patch_end);
 292
 293         switch (sun4v_chip_type) {
 294         case SUN4V_CHIP_SPARC_M7:
 295         case SUN4V_CHIP_SPARC_M8:
 296         case SUN4V_CHIP_SPARC_SN:
 297                 sun4v_patch_1insn_range(&__sun_m7_1insn_patch,
 298                                         &__sun_m7_1insn_patch_end);
 299                 sun_m7_patch_2insn_range(&__sun_m7_2insn_patch,
 300                                          &__sun_m7_2insn_patch_end);
 301                 break;
 302         default:
 303                 break;
 304         }
 305
 306         if (sun4v_chip_type != SUN4V_CHIP_NIAGARA1) {
 307                 sun4v_patch_1insn_range(&__fast_win_ctrl_1insn_patch,
 308                                         &__fast_win_ctrl_1insn_patch_end);
 309         }
 310
 311         sun4v_hvapi_init();
 312 }
 313
 314 static void __init popc_patch(void)
 315 {
 316         struct popc_3insn_patch_entry *p3;
 317         struct popc_6insn_patch_entry *p6;
 318
 319         p3 = &__popc_3insn_patch;
 320         while (p3 < &__popc_3insn_patch_end) {
 321                 unsigned long i, addr = p3->addr;
 322
 323                 for (i = 0; i < 3; i++) {
 324                         *(unsigned int *) (addr +  (i * 4)) = p3->insns[i];
 325                         wmb();
 326                         __asm__ __volatile__("flush     %0"
 327                                              : : "r" (addr +  (i * 4)));
 328                 }
 329
 330                 p3++;
 331         }
 332
 333         p6 = &__popc_6insn_patch;
 334         while (p6 < &__popc_6insn_patch_end) {
 335                 unsigned long i, addr = p6->addr;
 336
 337                 for (i = 0; i < 6; i++) {
 338                         *(unsigned int *) (addr +  (i * 4)) = p6->insns[i];
 339                         wmb();
 340                         __asm__ __volatile__("flush     %0"
 341                                              : : "r" (addr +  (i * 4)));
 342                 }
 343
 344                 p6++;
 345         }
 346 }
 347
 348 static void __init pause_patch(void)
 349 {
 350         struct pause_patch_entry *p;
 351
 352         p = &__pause_3insn_patch;
 353         while (p < &__pause_3insn_patch_end) {
 354                 unsigned long i, addr = p->addr;
 355
 356                 for (i = 0; i < 3; i++) {
 357                         *(unsigned int *) (addr +  (i * 4)) = p->insns[i];
 358                         wmb();
 359                         __asm__ __volatile__("flush     %0"
 360                                              : : "r" (addr +  (i * 4)));
 361                 }
 362
 363                 p++;
 364         }
 365 }
 366
 367 void __init start_early_boot(void)
 368 {
 369         int cpu;
 370
 371         check_if_starfire();
 372         per_cpu_patch();
 373         sun4v_patch();
 374         smp_init_cpu_poke();
 375
 376         cpu = hard_smp_processor_id();
 377         if (cpu >= NR_CPUS) {
 378                 prom_printf("Serious problem, boot cpu id (%d) >= NR_CPUS (%d)\n",
 379                             cpu, NR_CPUS);
 380                 prom_halt();
 381         }
 382         current_thread_info()->cpu = cpu;
 383
 384         time_init_early();
 385         prom_init_report();
 386         start_kernel();
 387 }
 388
 389 /* On Ultra, we support all of the v8 capabilities. */
 390 unsigned long sparc64_elf_hwcap = (HWCAP_SPARC_FLUSH | HWCAP_SPARC_STBAR |
 391                                    HWCAP_SPARC_SWAP | HWCAP_SPARC_MULDIV |
 392                                    HWCAP_SPARC_V9);
 393 EXPORT_SYMBOL(sparc64_elf_hwcap);
 394
 395 static const char *hwcaps[] = {
 396         "flush", "stbar", "swap", "muldiv", "v9",
 397         "ultra3", "blkinit", "n2",
 398
 399         /* These strings are as they appear in the machine description
 400          * 'hwcap-list' property for cpu nodes.
 401          */
 402         "mul32", "div32", "fsmuld", "v8plus", "popc", "vis", "vis2",
 403         "ASIBlkInit", "fmaf", "vis3", "hpc", "random", "trans", "fjfmau",
 404         "ima", "cspare", "pause", "cbcond", NULL /*reserved for crypto */,
 405         "adp",
 406 };
 407
 408 static const char *crypto_hwcaps[] = {
 409         "aes", "des", "kasumi", "camellia", "md5", "sha1", "sha256",
 410         "sha512", "mpmul", "montmul", "montsqr", "crc32c",
 411 };
 412
 413 void cpucap_info(struct seq_file *m)
 414 {
 415         unsigned long caps = sparc64_elf_hwcap;
 416         int i, printed = 0;
 417
 418         seq_puts(m, "cpucaps\t\t: ");
 419         for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
 420                 unsigned long bit = 1UL << i;
 421                 if (hwcaps[i] && (caps & bit)) {
 422                         seq_printf(m, "%s%s",
 423                                    printed ? "," : "", hwcaps[i]);
 424                         printed++;
 425                 }
 426         }
 427         if (caps & HWCAP_SPARC_CRYPTO) {
 428                 unsigned long cfr;
 429
 430                 __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 431                 for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
 432                         unsigned long bit = 1UL << i;
 433                         if (cfr & bit) {
 434                                 seq_printf(m, "%s%s",
 435                                            printed ? "," : "", crypto_hwcaps[i]);
 436                                 printed++;
 437                         }
 438                 }
 439         }
 440         seq_putc(m, '\n');
 441 }
 442
 443 static void __init report_one_hwcap(int *printed, const char *name)
 444 {
 445         if ((*printed) == 0)
 446                 printk(KERN_INFO "CPU CAPS: [");
 447         printk(KERN_CONT "%s%s",
 448                (*printed) ? "," : "", name);
 449         if (++(*printed) == 8) {
 450                 printk(KERN_CONT "]\n");
 451                 *printed = 0;
 452         }
 453 }
 454
 455 static void __init report_crypto_hwcaps(int *printed)
 456 {
 457         unsigned long cfr;
 458         int i;
 459
 460         __asm__ __volatile__("rd %%asr26, %0" : "=r" (cfr));
 461
 462         for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
 463                 unsigned long bit = 1UL << i;
 464                 if (cfr & bit)
 465                         report_one_hwcap(printed, crypto_hwcaps[i]);
 466         }
 467 }
 468
 469 static void __init report_hwcaps(unsigned long caps)
 470 {
 471         int i, printed = 0;
 472
 473         for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
 474                 unsigned long bit = 1UL << i;
 475                 if (hwcaps[i] && (caps & bit))
 476                         report_one_hwcap(&printed, hwcaps[i]);
 477         }
 478         if (caps & HWCAP_SPARC_CRYPTO)
 479                 report_crypto_hwcaps(&printed);
 480         if (printed != 0)
 481                 printk(KERN_CONT "]\n");
 482 }
 483
 484 static unsigned long __init mdesc_cpu_hwcap_list(void)
 485 {
 486         struct mdesc_handle *hp;
 487         unsigned long caps = 0;
 488         const char *prop;
 489         int len;
 490         u64 pn;
 491
 492         hp = mdesc_grab();
 493         if (!hp)
 494                 return 0;
 495
 496         pn = mdesc_node_by_name(hp, MDESC_NODE_NULL, "cpu");
 497         if (pn == MDESC_NODE_NULL)
 498                 goto out;
 499
 500         prop = mdesc_get_property(hp, pn, "hwcap-list", &len);
 501         if (!prop)
 502                 goto out;
 503
 504         while (len) {
 505                 int i, plen;
 506
 507                 for (i = 0; i < ARRAY_SIZE(hwcaps); i++) {
 508                         unsigned long bit = 1UL << i;
 509
 510                         if (hwcaps[i] && !strcmp(prop, hwcaps[i])) {
 511                                 caps |= bit;
 512                                 break;
 513                         }
 514                 }
 515                 for (i = 0; i < ARRAY_SIZE(crypto_hwcaps); i++) {
 516                         if (!strcmp(prop, crypto_hwcaps[i]))
 517                                 caps |= HWCAP_SPARC_CRYPTO;
 518                 }
 519
 520                 plen = strlen(prop) + 1;
 521                 prop += plen;
 522                 len -= plen;
 523         }
 524
 525 out:
 526         mdesc_release(hp);
 527         return caps;
 528 }
 529
 530 /* This yields a mask that user programs can use to figure out what
 531  * instruction set this cpu supports.
 532  */
 533 static void __init init_sparc64_elf_hwcap(void)
 534 {
 535         unsigned long cap = sparc64_elf_hwcap;
 536         unsigned long mdesc_caps;
 537
 538         if (tlb_type == cheetah || tlb_type == cheetah_plus)
 539                 cap |= HWCAP_SPARC_ULTRA3;
 540         else if (tlb_type == hypervisor) {
 541                 if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1 ||
 542                     sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
 543                     sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
 544                     sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
 545                     sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
 546                     sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
 547                     sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
 548                     sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
 549                     sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
 550                     sun4v_chip_type == SUN4V_CHIP_SPARC64X)
 551                         cap |= HWCAP_SPARC_BLKINIT;
 552                 if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
 553                     sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
 554                     sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
 555                     sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
 556                     sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
 557                     sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
 558                     sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
 559                     sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
 560                     sun4v_chip_type == SUN4V_CHIP_SPARC64X)
 561                         cap |= HWCAP_SPARC_N2;
 562         }
 563
 564         cap |= (AV_SPARC_MUL32 | AV_SPARC_DIV32 | AV_SPARC_V8PLUS);
 565
 566         mdesc_caps = mdesc_cpu_hwcap_list();
 567         if (!mdesc_caps) {
 568                 if (tlb_type == spitfire)
 569                         cap |= AV_SPARC_VIS;
 570                 if (tlb_type == cheetah || tlb_type == cheetah_plus)
 571                         cap |= AV_SPARC_VIS | AV_SPARC_VIS2;
 572                 if (tlb_type == cheetah_plus) {
 573                         unsigned long impl, ver;
 574
 575                         __asm__ __volatile__("rdpr %%ver, %0" : "=r" (ver));
 576                         impl = ((ver >> 32) & 0xffff);
 577                         if (impl == PANTHER_IMPL)
 578                                 cap |= AV_SPARC_POPC;
 579                 }
 580                 if (tlb_type == hypervisor) {
 581                         if (sun4v_chip_type == SUN4V_CHIP_NIAGARA1)
 582                                 cap |= AV_SPARC_ASI_BLK_INIT;
 583                         if (sun4v_chip_type == SUN4V_CHIP_NIAGARA2 ||
 584                             sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
 585                             sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
 586                             sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
 587                             sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
 588                             sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
 589                             sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
 590                             sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
 591                             sun4v_chip_type == SUN4V_CHIP_SPARC64X)
 592                                 cap |= (AV_SPARC_VIS | AV_SPARC_VIS2 |
 593                                         AV_SPARC_ASI_BLK_INIT |
 594                                         AV_SPARC_POPC);
 595                         if (sun4v_chip_type == SUN4V_CHIP_NIAGARA3 ||
 596                             sun4v_chip_type == SUN4V_CHIP_NIAGARA4 ||
 597                             sun4v_chip_type == SUN4V_CHIP_NIAGARA5 ||
 598                             sun4v_chip_type == SUN4V_CHIP_SPARC_M6 ||
 599                             sun4v_chip_type == SUN4V_CHIP_SPARC_M7 ||
 600                             sun4v_chip_type == SUN4V_CHIP_SPARC_M8 ||
 601                             sun4v_chip_type == SUN4V_CHIP_SPARC_SN ||
 602                             sun4v_chip_type == SUN4V_CHIP_SPARC64X)
 603                                 cap |= (AV_SPARC_VIS3 | AV_SPARC_HPC |
 604                                         AV_SPARC_FMAF);
 605                 }
 606         }
 607         sparc64_elf_hwcap = cap | mdesc_caps;
 608
 609         report_hwcaps(sparc64_elf_hwcap);
 610
 611         if (sparc64_elf_hwcap & AV_SPARC_POPC)
 612                 popc_patch();
 613         if (sparc64_elf_hwcap & AV_SPARC_PAUSE)
 614                 pause_patch();
 615 }
 616
 617 void __init alloc_irqstack_bootmem(void)
 618 {
 619         unsigned int i, node;
 620
 621         for_each_possible_cpu(i) {
 622                 node = cpu_to_node(i);
 623
 624                 softirq_stack[i] = memblock_alloc_node(THREAD_SIZE,
 625                                                        THREAD_SIZE, node);
 626                 if (!softirq_stack[i])
 627                         panic("%s: Failed to allocate %lu bytes align=%lx nid=%d\n",
 628                               __func__, THREAD_SIZE, THREAD_SIZE, node);
 629                 hardirq_stack[i] = memblock_alloc_node(THREAD_SIZE,
 630                                                        THREAD_SIZE, node);
 631                 if (!hardirq_stack[i])
 632                         panic("%s: Failed to allocate %lu bytes align=%lx nid=%d\n",
 633                               __func__, THREAD_SIZE, THREAD_SIZE, node);
 634         }
 635 }
 636
 637 void __init setup_arch(char **cmdline_p)
 638 {
 639         /* Initialize PROM console and command line. */
 640         *cmdline_p = prom_getbootargs();
 641         strlcpy(boot_command_line, *cmdline_p, COMMAND_LINE_SIZE);
 642         parse_early_param();
 643
 644         boot_flags_init(*cmdline_p);
 645 #ifdef CONFIG_EARLYFB
 646         if (btext_find_display())
 647 #endif
 648                 register_console(&prom_early_console);
 649
 650         if (tlb_type == hypervisor)
 651                 pr_info("ARCH: SUN4V\n");
 652         else
 653                 pr_info("ARCH: SUN4U\n");
 654
 655         idprom_init();
 656
 657         if (!root_flags)
 658                 root_mountflags &= ~MS_RDONLY;
 659         ROOT_DEV = old_decode_dev(root_dev);
 660 #ifdef CONFIG_BLK_DEV_RAM
 661         rd_image_start = ram_flags & RAMDISK_IMAGE_START_MASK;
 662 #endif
 663
 664         task_thread_info(&init_task)->kregs = &fake_swapper_regs;
 665
 666 #ifdef CONFIG_IP_PNP
 667         if (!ic_set_manually) {
 668                 phandle chosen = prom_finddevice("/chosen");
 669                 u32 cl, sv, gw;
 670
 671                 cl = prom_getintdefault (chosen, "client-ip", 0);
 672                 sv = prom_getintdefault (chosen, "server-ip", 0);
 673                 gw = prom_getintdefault (chosen, "gateway-ip", 0);
 674                 if (cl && sv) {
 675                         ic_myaddr = cl;
 676                         ic_servaddr = sv;
 677                         if (gw)
 678                                 ic_gateway = gw;
 679 #if defined(CONFIG_IP_PNP_BOOTP) || defined(CONFIG_IP_PNP_RARP)
 680                         ic_proto_enabled = 0;
 681 #endif
 682                 }
 683         }
 684 #endif
 685
 686         /* Get boot processor trap_block[] setup.  */
 687         init_cur_cpu_trap(current_thread_info());
 688
 689         paging_init();
 690         init_sparc64_elf_hwcap();
 691         smp_fill_in_cpu_possible_map();
 692         /*
 693          * Once the OF device tree and MDESC have been setup and nr_cpus has
 694          * been parsed, we know the list of possible cpus.  Therefore we can
 695          * allocate the IRQ stacks.
 696          */
 697         alloc_irqstack_bootmem();
 698 }
 699
 700 extern int stop_a_enabled;
 701
 702 void sun_do_break(void)
 703 {
 704         if (!stop_a_enabled)
 705                 return;
 706
 707         prom_printf("\n");
 708         flush_user_windows();
 709
 710         prom_cmdline();
 711 }
 712 EXPORT_SYMBOL(sun_do_break);
 713
 714 int stop_a_enabled = 1;
 715 EXPORT_SYMBOL(stop_a_enabled);