arch/arc/kernel/setup.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
read_decode_ccm_bcr
decode_arc_core
read_arc_build_cfg_regs
arc_cpu_mumbojumbo
arc_extn_mumbojumbo
arc_chk_core_config
setup_processor
uboot_arg_invalid
handle_uboot_args
setup_arch
time_init
customize_machine
init_late_machine
show_cpuinfo
c_start
c_next
c_stop
topology_init
   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
   4  */
   5 
   6 #include <linux/seq_file.h>
   7 #include <linux/fs.h>
   8 #include <linux/delay.h>
   9 #include <linux/root_dev.h>
  10 #include <linux/clk.h>
  11 #include <linux/clk-provider.h>
  12 #include <linux/clocksource.h>
  13 #include <linux/console.h>
  14 #include <linux/module.h>
  15 #include <linux/sizes.h>
  16 #include <linux/cpu.h>
  17 #include <linux/of_fdt.h>
  18 #include <linux/of.h>
  19 #include <linux/cache.h>
  20 #include <uapi/linux/mount.h>
  21 #include <asm/sections.h>
  22 #include <asm/arcregs.h>
  23 #include <asm/tlb.h>
  24 #include <asm/setup.h>
  25 #include <asm/page.h>
  26 #include <asm/irq.h>
  27 #include <asm/unwind.h>
  28 #include <asm/mach_desc.h>
  29 #include <asm/smp.h>
  30 
  31 #define FIX_PTR(x)  __asm__ __volatile__(";" : "+r"(x))
  32 
  33 unsigned int intr_to_DE_cnt;
  34 
  35 /* Part of U-boot ABI: see head.S */
  36 int __initdata uboot_tag;
  37 int __initdata uboot_magic;
  38 char __initdata *uboot_arg;
  39 
  40 const struct machine_desc *machine_desc;
  41 
  42 struct task_struct *_current_task[NR_CPUS];     /* For stack switching */
  43 
  44 struct cpuinfo_arc cpuinfo_arc700[NR_CPUS];
  45 
  46 static const struct id_to_str arc_legacy_rel[] = {
  47         /* ID.ARCVER,   Release */
  48 #ifdef CONFIG_ISA_ARCOMPACT
  49         { 0x34,         "R4.10"},
  50         { 0x35,         "R4.11"},
  51 #else
  52         { 0x51,         "R2.0" },
  53         { 0x52,         "R2.1" },
  54         { 0x53,         "R3.0" },
  55 #endif
  56         { 0x00,         NULL   }
  57 };
  58 
  59 static const struct id_to_str arc_cpu_rel[] = {
  60         /* UARCH.MAJOR, Release */
  61         {  0,           "R3.10a"},
  62         {  1,           "R3.50a"},
  63         {  0xFF,        NULL   }
  64 };
  65 
  66 static void read_decode_ccm_bcr(struct cpuinfo_arc *cpu)
  67 {
  68         if (is_isa_arcompact()) {
  69                 struct bcr_iccm_arcompact iccm;
  70                 struct bcr_dccm_arcompact dccm;
  71 
  72                 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
  73                 if (iccm.ver) {
  74                         cpu->iccm.sz = 4096 << iccm.sz; /* 8K to 512K */
  75                         cpu->iccm.base_addr = iccm.base << 16;
  76                 }
  77 
  78                 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
  79                 if (dccm.ver) {
  80                         unsigned long base;
  81                         cpu->dccm.sz = 2048 << dccm.sz; /* 2K to 256K */
  82 
  83                         base = read_aux_reg(ARC_REG_DCCM_BASE_BUILD);
  84                         cpu->dccm.base_addr = base & ~0xF;
  85                 }
  86         } else {
  87                 struct bcr_iccm_arcv2 iccm;
  88                 struct bcr_dccm_arcv2 dccm;
  89                 unsigned long region;
  90 
  91                 READ_BCR(ARC_REG_ICCM_BUILD, iccm);
  92                 if (iccm.ver) {
  93                         cpu->iccm.sz = 256 << iccm.sz00;        /* 512B to 16M */
  94                         if (iccm.sz00 == 0xF && iccm.sz01 > 0)
  95                                 cpu->iccm.sz <<= iccm.sz01;
  96 
  97                         region = read_aux_reg(ARC_REG_AUX_ICCM);
  98                         cpu->iccm.base_addr = region & 0xF0000000;
  99                 }
 100 
 101                 READ_BCR(ARC_REG_DCCM_BUILD, dccm);
 102                 if (dccm.ver) {
 103                         cpu->dccm.sz = 256 << dccm.sz0;
 104                         if (dccm.sz0 == 0xF && dccm.sz1 > 0)
 105                                 cpu->dccm.sz <<= dccm.sz1;
 106 
 107                         region = read_aux_reg(ARC_REG_AUX_DCCM);
 108                         cpu->dccm.base_addr = region & 0xF0000000;
 109                 }
 110         }
 111 }
 112 
 113 static void decode_arc_core(struct cpuinfo_arc *cpu)
 114 {
 115         struct bcr_uarch_build_arcv2 uarch;
 116         const struct id_to_str *tbl;
 117 
 118         /*
 119          * Up until (including) the first core4 release (0x54) things were
 120          * simple: AUX IDENTITY.ARCVER was sufficient to identify arc family
 121          * and release: 0x50 to 0x53 was HS38, 0x54 was HS48 (dual issue)
 122          */
 123 
 124         if (cpu->core.family < 0x54) { /* includes arc700 */
 125 
 126                 for (tbl = &arc_legacy_rel[0]; tbl->id != 0; tbl++) {
 127                         if (cpu->core.family == tbl->id) {
 128                                 cpu->release = tbl->str;
 129                                 break;
 130                         }
 131                 }
 132 
 133                 if (is_isa_arcompact())
 134                         cpu->name = "ARC700";
 135                 else if (tbl->str)
 136                         cpu->name = "HS38";
 137                 else
 138                         cpu->name = cpu->release = "Unknown";
 139 
 140                 return;
 141         }
 142 
 143         /*
 144          * However the subsequent HS release (same 0x54) allow HS38 or HS48
 145          * configurations and encode this info in a different BCR.
 146          * The BCR was introduced in 0x54 so can't be read unconditionally.
 147          */
 148 
 149         READ_BCR(ARC_REG_MICRO_ARCH_BCR, uarch);
 150 
 151         if (uarch.prod == 4) {
 152                 cpu->name = "HS48";
 153                 cpu->extn.dual = 1;
 154 
 155         } else {
 156                 cpu->name = "HS38";
 157         }
 158 
 159         for (tbl = &arc_cpu_rel[0]; tbl->id != 0xFF; tbl++) {
 160                 if (uarch.maj == tbl->id) {
 161                         cpu->release = tbl->str;
 162                         break;
 163                 }
 164         }
 165 }
 166 
 167 static void read_arc_build_cfg_regs(void)
 168 {
 169         struct bcr_timer timer;
 170         struct bcr_generic bcr;
 171         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 172         struct bcr_isa_arcv2 isa;
 173         struct bcr_actionpoint ap;
 174 
 175         FIX_PTR(cpu);
 176 
 177         READ_BCR(AUX_IDENTITY, cpu->core);
 178         decode_arc_core(cpu);
 179 
 180         READ_BCR(ARC_REG_TIMERS_BCR, timer);
 181         cpu->extn.timer0 = timer.t0;
 182         cpu->extn.timer1 = timer.t1;
 183         cpu->extn.rtc = timer.rtc;
 184 
 185         cpu->vec_base = read_aux_reg(AUX_INTR_VEC_BASE);
 186 
 187         READ_BCR(ARC_REG_MUL_BCR, cpu->extn_mpy);
 188 
 189         /* Read CCM BCRs for boot reporting even if not enabled in Kconfig */
 190         read_decode_ccm_bcr(cpu);
 191 
 192         read_decode_mmu_bcr();
 193         read_decode_cache_bcr();
 194 
 195         if (is_isa_arcompact()) {
 196                 struct bcr_fp_arcompact sp, dp;
 197                 struct bcr_bpu_arcompact bpu;
 198 
 199                 READ_BCR(ARC_REG_FP_BCR, sp);
 200                 READ_BCR(ARC_REG_DPFP_BCR, dp);
 201                 cpu->extn.fpu_sp = sp.ver ? 1 : 0;
 202                 cpu->extn.fpu_dp = dp.ver ? 1 : 0;
 203 
 204                 READ_BCR(ARC_REG_BPU_BCR, bpu);
 205                 cpu->bpu.ver = bpu.ver;
 206                 cpu->bpu.full = bpu.fam ? 1 : 0;
 207                 if (bpu.ent) {
 208                         cpu->bpu.num_cache = 256 << (bpu.ent - 1);
 209                         cpu->bpu.num_pred = 256 << (bpu.ent - 1);
 210                 }
 211         } else {
 212                 struct bcr_fp_arcv2 spdp;
 213                 struct bcr_bpu_arcv2 bpu;
 214 
 215                 READ_BCR(ARC_REG_FP_V2_BCR, spdp);
 216                 cpu->extn.fpu_sp = spdp.sp ? 1 : 0;
 217                 cpu->extn.fpu_dp = spdp.dp ? 1 : 0;
 218 
 219                 READ_BCR(ARC_REG_BPU_BCR, bpu);
 220                 cpu->bpu.ver = bpu.ver;
 221                 cpu->bpu.full = bpu.ft;
 222                 cpu->bpu.num_cache = 256 << bpu.bce;
 223                 cpu->bpu.num_pred = 2048 << bpu.pte;
 224                 cpu->bpu.ret_stk = 4 << bpu.rse;
 225 
 226                 /* if dual issue hardware, is it enabled ? */
 227                 if (cpu->extn.dual) {
 228                         unsigned int exec_ctrl;
 229 
 230                         READ_BCR(AUX_EXEC_CTRL, exec_ctrl);
 231                         cpu->extn.dual_enb = !(exec_ctrl & 1);
 232                 }
 233         }
 234 
 235         READ_BCR(ARC_REG_AP_BCR, ap);
 236         if (ap.ver) {
 237                 cpu->extn.ap_num = 2 << ap.num;
 238                 cpu->extn.ap_full = !ap.min;
 239         }
 240 
 241         READ_BCR(ARC_REG_SMART_BCR, bcr);
 242         cpu->extn.smart = bcr.ver ? 1 : 0;
 243 
 244         READ_BCR(ARC_REG_RTT_BCR, bcr);
 245         cpu->extn.rtt = bcr.ver ? 1 : 0;
 246 
 247         READ_BCR(ARC_REG_ISA_CFG_BCR, isa);
 248 
 249         /* some hacks for lack of feature BCR info in old ARC700 cores */
 250         if (is_isa_arcompact()) {
 251                 if (!isa.ver)   /* ISA BCR absent, use Kconfig info */
 252                         cpu->isa.atomic = IS_ENABLED(CONFIG_ARC_HAS_LLSC);
 253                 else {
 254                         /* ARC700_BUILD only has 2 bits of isa info */
 255                         struct bcr_generic bcr = *(struct bcr_generic *)&isa;
 256                         cpu->isa.atomic = bcr.info & 1;
 257                 }
 258 
 259                 cpu->isa.be = IS_ENABLED(CONFIG_CPU_BIG_ENDIAN);
 260 
 261                  /* there's no direct way to distinguish 750 vs. 770 */
 262                 if (unlikely(cpu->core.family < 0x34 || cpu->mmu.ver < 3))
 263                         cpu->name = "ARC750";
 264         } else {
 265                 cpu->isa = isa;
 266         }
 267 }
 268 
 269 static char *arc_cpu_mumbojumbo(int cpu_id, char *buf, int len)
 270 {
 271         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 272         struct bcr_identity *core = &cpu->core;
 273         char mpy_opt[16];
 274         int n = 0;
 275 
 276         FIX_PTR(cpu);
 277 
 278         n += scnprintf(buf + n, len - n,
 279                        "\nIDENTITY\t: ARCVER [%#02x] ARCNUM [%#02x] CHIPID [%#4x]\n",
 280                        core->family, core->cpu_id, core->chip_id);
 281 
 282         n += scnprintf(buf + n, len - n, "processor [%d]\t: %s %s (%s ISA) %s%s%s\n",
 283                        cpu_id, cpu->name, cpu->release,
 284                        is_isa_arcompact() ? "ARCompact" : "ARCv2",
 285                        IS_AVAIL1(cpu->isa.be, "[Big-Endian]"),
 286                        IS_AVAIL3(cpu->extn.dual, cpu->extn.dual_enb, " Dual-Issue "));
 287 
 288         n += scnprintf(buf + n, len - n, "Timers\t\t: %s%s%s%s%s%s\nISA Extn\t: ",
 289                        IS_AVAIL1(cpu->extn.timer0, "Timer0 "),
 290                        IS_AVAIL1(cpu->extn.timer1, "Timer1 "),
 291                        IS_AVAIL2(cpu->extn.rtc, "RTC [UP 64-bit] ", CONFIG_ARC_TIMERS_64BIT),
 292                        IS_AVAIL2(cpu->extn.gfrc, "GFRC [SMP 64-bit] ", CONFIG_ARC_TIMERS_64BIT));
 293 
 294         if (cpu->extn_mpy.ver) {
 295                 if (is_isa_arcompact()) {
 296                         scnprintf(mpy_opt, 16, "mpy");
 297                 } else {
 298 
 299                         int opt = 2;    /* stock MPY/MPYH */
 300 
 301                         if (cpu->extn_mpy.dsp)  /* OPT 7-9 */
 302                                 opt = cpu->extn_mpy.dsp + 6;
 303 
 304                         scnprintf(mpy_opt, 16, "mpy[opt %d] ", opt);
 305                 }
 306         }
 307 
 308         n += scnprintf(buf + n, len - n, "%s%s%s%s%s%s%s%s\n",
 309                        IS_AVAIL2(cpu->isa.atomic, "atomic ", CONFIG_ARC_HAS_LLSC),
 310                        IS_AVAIL2(cpu->isa.ldd, "ll64 ", CONFIG_ARC_HAS_LL64),
 311                        IS_AVAIL2(cpu->isa.unalign, "unalign ", CONFIG_ARC_USE_UNALIGNED_MEM_ACCESS),
 312                        IS_AVAIL1(cpu->extn_mpy.ver, mpy_opt),
 313                        IS_AVAIL1(cpu->isa.div_rem, "div_rem "));
 314 
 315         if (cpu->bpu.ver) {
 316                 n += scnprintf(buf + n, len - n,
 317                               "BPU\t\t: %s%s match, cache:%d, Predict Table:%d Return stk: %d",
 318                               IS_AVAIL1(cpu->bpu.full, "full"),
 319                               IS_AVAIL1(!cpu->bpu.full, "partial"),
 320                               cpu->bpu.num_cache, cpu->bpu.num_pred, cpu->bpu.ret_stk);
 321 
 322                 if (is_isa_arcv2()) {
 323                         struct bcr_lpb lpb;
 324 
 325                         READ_BCR(ARC_REG_LPB_BUILD, lpb);
 326                         if (lpb.ver) {
 327                                 unsigned int ctl;
 328                                 ctl = read_aux_reg(ARC_REG_LPB_CTRL);
 329 
 330                                 n += scnprintf(buf + n, len - n, " Loop Buffer:%d %s",
 331                                                lpb.entries,
 332                                                IS_DISABLED_RUN(!ctl));
 333                         }
 334                 }
 335                 n += scnprintf(buf + n, len - n, "\n");
 336         }
 337 
 338         return buf;
 339 }
 340 
 341 static char *arc_extn_mumbojumbo(int cpu_id, char *buf, int len)
 342 {
 343         int n = 0;
 344         struct cpuinfo_arc *cpu = &cpuinfo_arc700[cpu_id];
 345 
 346         FIX_PTR(cpu);
 347 
 348         n += scnprintf(buf + n, len - n, "Vector Table\t: %#x\n", cpu->vec_base);
 349 
 350         if (cpu->extn.fpu_sp || cpu->extn.fpu_dp)
 351                 n += scnprintf(buf + n, len - n, "FPU\t\t: %s%s\n",
 352                                IS_AVAIL1(cpu->extn.fpu_sp, "SP "),
 353                                IS_AVAIL1(cpu->extn.fpu_dp, "DP "));
 354 
 355         if (cpu->extn.ap_num | cpu->extn.smart | cpu->extn.rtt) {
 356                 n += scnprintf(buf + n, len - n, "DEBUG\t\t: %s%s",
 357                                IS_AVAIL1(cpu->extn.smart, "smaRT "),
 358                                IS_AVAIL1(cpu->extn.rtt, "RTT "));
 359                 if (cpu->extn.ap_num) {
 360                         n += scnprintf(buf + n, len - n, "ActionPoint %d/%s",
 361                                        cpu->extn.ap_num,
 362                                        cpu->extn.ap_full ? "full":"min");
 363                 }
 364                 n += scnprintf(buf + n, len - n, "\n");
 365         }
 366 
 367         if (cpu->dccm.sz || cpu->iccm.sz)
 368                 n += scnprintf(buf + n, len - n, "Extn [CCM]\t: DCCM @ %x, %d KB / ICCM: @ %x, %d KB\n",
 369                                cpu->dccm.base_addr, TO_KB(cpu->dccm.sz),
 370                                cpu->iccm.base_addr, TO_KB(cpu->iccm.sz));
 371 
 372         if (is_isa_arcv2()) {
 373 
 374                 /* Error Protection: ECC/Parity */
 375                 struct bcr_erp erp;
 376                 READ_BCR(ARC_REG_ERP_BUILD, erp);
 377 
 378                 if (erp.ver) {
 379                         struct  ctl_erp ctl;
 380                         READ_BCR(ARC_REG_ERP_CTRL, ctl);
 381 
 382                         /* inverted bits: 0 means enabled */
 383                         n += scnprintf(buf + n, len - n, "Extn [ECC]\t: %s%s%s%s%s%s\n",
 384                                 IS_AVAIL3(erp.ic,  !ctl.dpi, "IC "),
 385                                 IS_AVAIL3(erp.dc,  !ctl.dpd, "DC "),
 386                                 IS_AVAIL3(erp.mmu, !ctl.mpd, "MMU "));
 387                 }
 388         }
 389 
 390         return buf;
 391 }
 392 
 393 static void arc_chk_core_config(void)
 394 {
 395         struct cpuinfo_arc *cpu = &cpuinfo_arc700[smp_processor_id()];
 396         int saved = 0, present = 0;
 397         char *opt_nm = NULL;
 398 
 399         if (!cpu->extn.timer0)
 400                 panic("Timer0 is not present!\n");
 401 
 402         if (!cpu->extn.timer1)
 403                 panic("Timer1 is not present!\n");
 404 
 405 #ifdef CONFIG_ARC_HAS_DCCM
 406         /*
 407          * DCCM can be arbit placed in hardware.
 408          * Make sure it's placement/sz matches what Linux is built with
 409          */
 410         if ((unsigned int)__arc_dccm_base != cpu->dccm.base_addr)
 411                 panic("Linux built with incorrect DCCM Base address\n");
 412 
 413         if (CONFIG_ARC_DCCM_SZ * SZ_1K != cpu->dccm.sz)
 414                 panic("Linux built with incorrect DCCM Size\n");
 415 #endif
 416 
 417 #ifdef CONFIG_ARC_HAS_ICCM
 418         if (CONFIG_ARC_ICCM_SZ * SZ_1K != cpu->iccm.sz)
 419                 panic("Linux built with incorrect ICCM Size\n");
 420 #endif
 421 
 422         /*
 423          * FP hardware/software config sanity
 424          * -If hardware present, kernel needs to save/restore FPU state
 425          * -If not, it will crash trying to save/restore the non-existant regs
 426          */
 427 
 428         if (is_isa_arcompact()) {
 429                 opt_nm = "CONFIG_ARC_FPU_SAVE_RESTORE";
 430                 saved = IS_ENABLED(CONFIG_ARC_FPU_SAVE_RESTORE);
 431 
 432                 /* only DPDP checked since SP has no arch visible regs */
 433                 present = cpu->extn.fpu_dp;
 434         } else {
 435                 opt_nm = "CONFIG_ARC_HAS_ACCL_REGS";
 436                 saved = IS_ENABLED(CONFIG_ARC_HAS_ACCL_REGS);
 437 
 438                 /* Accumulator Low:High pair (r58:59) present if DSP MPY or FPU */
 439                 present = cpu->extn_mpy.dsp | cpu->extn.fpu_sp | cpu->extn.fpu_dp;
 440         }
 441 
 442         if (present && !saved)
 443                 pr_warn("Enable %s for working apps\n", opt_nm);
 444         else if (!present && saved)
 445                 panic("Disable %s, hardware NOT present\n", opt_nm);
 446 }
 447 
 448 /*
 449  * Initialize and setup the processor core
 450  * This is called by all the CPUs thus should not do special case stuff
 451  *    such as only for boot CPU etc
 452  */
 453 
 454 void setup_processor(void)
 455 {
 456         char str[512];
 457         int cpu_id = smp_processor_id();
 458 
 459         read_arc_build_cfg_regs();
 460         arc_init_IRQ();
 461 
 462         pr_info("%s", arc_cpu_mumbojumbo(cpu_id, str, sizeof(str)));
 463 
 464         arc_mmu_init();
 465         arc_cache_init();
 466 
 467         pr_info("%s", arc_extn_mumbojumbo(cpu_id, str, sizeof(str)));
 468         pr_info("%s", arc_platform_smp_cpuinfo());
 469 
 470         arc_chk_core_config();
 471 }
 472 
 473 static inline bool uboot_arg_invalid(unsigned long addr)
 474 {
 475         /*
 476          * Check that it is a untranslated address (although MMU is not enabled
 477          * yet, it being a high address ensures this is not by fluke)
 478          */
 479         if (addr < PAGE_OFFSET)
 480                 return true;
 481 
 482         /* Check that address doesn't clobber resident kernel image */
 483         return addr >= (unsigned long)_stext && addr <= (unsigned long)_end;
 484 }
 485 
 486 #define IGNORE_ARGS             "Ignore U-boot args: "
 487 
 488 /* uboot_tag values for U-boot - kernel ABI revision 0; see head.S */
 489 #define UBOOT_TAG_NONE          0
 490 #define UBOOT_TAG_CMDLINE       1
 491 #define UBOOT_TAG_DTB           2
 492 /* We always pass 0 as magic from U-boot */
 493 #define UBOOT_MAGIC_VALUE       0
 494 
 495 void __init handle_uboot_args(void)
 496 {
 497         bool use_embedded_dtb = true;
 498         bool append_cmdline = false;
 499 
 500         /* check that we know this tag */
 501         if (uboot_tag != UBOOT_TAG_NONE &&
 502             uboot_tag != UBOOT_TAG_CMDLINE &&
 503             uboot_tag != UBOOT_TAG_DTB) {
 504                 pr_warn(IGNORE_ARGS "invalid uboot tag: '%08x'\n", uboot_tag);
 505                 goto ignore_uboot_args;
 506         }
 507 
 508         if (uboot_magic != UBOOT_MAGIC_VALUE) {
 509                 pr_warn(IGNORE_ARGS "non zero uboot magic\n");
 510                 goto ignore_uboot_args;
 511         }
 512 
 513         if (uboot_tag != UBOOT_TAG_NONE &&
 514             uboot_arg_invalid((unsigned long)uboot_arg)) {
 515                 pr_warn(IGNORE_ARGS "invalid uboot arg: '%px'\n", uboot_arg);
 516                 goto ignore_uboot_args;
 517         }
 518 
 519         /* see if U-boot passed an external Device Tree blob */
 520         if (uboot_tag == UBOOT_TAG_DTB) {
 521                 machine_desc = setup_machine_fdt((void *)uboot_arg);
 522 
 523                 /* external Device Tree blob is invalid - use embedded one */
 524                 use_embedded_dtb = !machine_desc;
 525         }
 526 
 527         if (uboot_tag == UBOOT_TAG_CMDLINE)
 528                 append_cmdline = true;
 529 
 530 ignore_uboot_args:
 531 
 532         if (use_embedded_dtb) {
 533                 machine_desc = setup_machine_fdt(__dtb_start);
 534                 if (!machine_desc)
 535                         panic("Embedded DT invalid\n");
 536         }
 537 
 538         /*
 539          * NOTE: @boot_command_line is populated by setup_machine_fdt() so this
 540          * append processing can only happen after.
 541          */
 542         if (append_cmdline) {
 543                 /* Ensure a whitespace between the 2 cmdlines */
 544                 strlcat(boot_command_line, " ", COMMAND_LINE_SIZE);
 545                 strlcat(boot_command_line, uboot_arg, COMMAND_LINE_SIZE);
 546         }
 547 }
 548 
 549 void __init setup_arch(char **cmdline_p)
 550 {
 551         handle_uboot_args();
 552 
 553         /* Save unparsed command line copy for /proc/cmdline */
 554         *cmdline_p = boot_command_line;
 555 
 556         /* To force early parsing of things like mem=xxx */
 557         parse_early_param();
 558 
 559         /* Platform/board specific: e.g. early console registration */
 560         if (machine_desc->init_early)
 561                 machine_desc->init_early();
 562 
 563         smp_init_cpus();
 564 
 565         setup_processor();
 566         setup_arch_memory();
 567 
 568         /* copy flat DT out of .init and then unflatten it */
 569         unflatten_and_copy_device_tree();
 570 
 571         /* Can be issue if someone passes cmd line arg "ro"
 572          * But that is unlikely so keeping it as it is
 573          */
 574         root_mountflags &= ~MS_RDONLY;
 575 
 576 #if defined(CONFIG_VT) && defined(CONFIG_DUMMY_CONSOLE)
 577         conswitchp = &dummy_con;
 578 #endif
 579 
 580         arc_unwind_init();
 581 }
 582 
 583 /*
 584  * Called from start_kernel() - boot CPU only
 585  */
 586 void __init time_init(void)
 587 {
 588         of_clk_init(NULL);
 589         timer_probe();
 590 }
 591 
 592 static int __init customize_machine(void)
 593 {
 594         if (machine_desc->init_machine)
 595                 machine_desc->init_machine();
 596 
 597         return 0;
 598 }
 599 arch_initcall(customize_machine);
 600 
 601 static int __init init_late_machine(void)
 602 {
 603         if (machine_desc->init_late)
 604                 machine_desc->init_late();
 605 
 606         return 0;
 607 }
 608 late_initcall(init_late_machine);
 609 /*
 610  *  Get CPU information for use by the procfs.
 611  */
 612 
 613 #define cpu_to_ptr(c)   ((void *)(0xFFFF0000 | (unsigned int)(c)))
 614 #define ptr_to_cpu(p)   (~0xFFFF0000UL & (unsigned int)(p))
 615 
 616 static int show_cpuinfo(struct seq_file *m, void *v)
 617 {
 618         char *str;
 619         int cpu_id = ptr_to_cpu(v);
 620         struct device *cpu_dev = get_cpu_device(cpu_id);
 621         struct clk *cpu_clk;
 622         unsigned long freq = 0;
 623 
 624         if (!cpu_online(cpu_id)) {
 625                 seq_printf(m, "processor [%d]\t: Offline\n", cpu_id);
 626                 goto done;
 627         }
 628 
 629         str = (char *)__get_free_page(GFP_KERNEL);
 630         if (!str)
 631                 goto done;
 632 
 633         seq_printf(m, arc_cpu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 634 
 635         cpu_clk = clk_get(cpu_dev, NULL);
 636         if (IS_ERR(cpu_clk)) {
 637                 seq_printf(m, "CPU speed \t: Cannot get clock for processor [%d]\n",
 638                            cpu_id);
 639         } else {
 640                 freq = clk_get_rate(cpu_clk);
 641         }
 642         if (freq)
 643                 seq_printf(m, "CPU speed\t: %lu.%02lu Mhz\n",
 644                            freq / 1000000, (freq / 10000) % 100);
 645 
 646         seq_printf(m, "Bogo MIPS\t: %lu.%02lu\n",
 647                    loops_per_jiffy / (500000 / HZ),
 648                    (loops_per_jiffy / (5000 / HZ)) % 100);
 649 
 650         seq_printf(m, arc_mmu_mumbojumbo(cpu_id, str, PAGE_SIZE));
 651         seq_printf(m, arc_cache_mumbojumbo(cpu_id, str, PAGE_SIZE));
 652         seq_printf(m, arc_extn_mumbojumbo(cpu_id, str, PAGE_SIZE));
 653         seq_printf(m, arc_platform_smp_cpuinfo());
 654 
 655         free_page((unsigned long)str);
 656 done:
 657         seq_printf(m, "\n");
 658 
 659         return 0;
 660 }
 661 
 662 static void *c_start(struct seq_file *m, loff_t *pos)
 663 {
 664         /*
 665          * Callback returns cpu-id to iterator for show routine, NULL to stop.
 666          * However since NULL is also a valid cpu-id (0), we use a round-about
 667          * way to pass it w/o having to kmalloc/free a 2 byte string.
 668          * Encode cpu-id as 0xFFcccc, which is decoded by show routine.
 669          */
 670         return *pos < nr_cpu_ids ? cpu_to_ptr(*pos) : NULL;
 671 }
 672 
 673 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 674 {
 675         ++*pos;
 676         return c_start(m, pos);
 677 }
 678 
 679 static void c_stop(struct seq_file *m, void *v)
 680 {
 681 }
 682 
 683 const struct seq_operations cpuinfo_op = {
 684         .start  = c_start,
 685         .next   = c_next,
 686         .stop   = c_stop,
 687         .show   = show_cpuinfo
 688 };
 689 
 690 static DEFINE_PER_CPU(struct cpu, cpu_topology);
 691 
 692 static int __init topology_init(void)
 693 {
 694         int cpu;
 695 
 696         for_each_present_cpu(cpu)
 697             register_cpu(&per_cpu(cpu_topology, cpu), cpu);
 698 
 699         return 0;
 700 }
 701 
 702 subsys_initcall(topology_init);
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root/arch/arc/kernel/setup.c

DEFINITIONS
