arch/powerpc/kernel/setup-common.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Common boot and setup code for both 32-bit and 64-bit.
   4  * Extracted from arch/powerpc/kernel/setup_64.c.
   5  *
   6  * Copyright (C) 2001 PPC64 Team, IBM Corp
   7  */
   8
   9 #undef DEBUG
  10
  11 #include <linux/export.h>
  12 #include <linux/string.h>
  13 #include <linux/sched.h>
  14 #include <linux/init.h>
  15 #include <linux/kernel.h>
  16 #include <linux/reboot.h>
  17 #include <linux/delay.h>
  18 #include <linux/initrd.h>
  19 #include <linux/platform_device.h>
  20 #include <linux/seq_file.h>
  21 #include <linux/ioport.h>
  22 #include <linux/console.h>
  23 #include <linux/screen_info.h>
  24 #include <linux/root_dev.h>
  25 #include <linux/notifier.h>
  26 #include <linux/cpu.h>
  27 #include <linux/unistd.h>
  28 #include <linux/serial.h>
  29 #include <linux/serial_8250.h>
  30 #include <linux/percpu.h>
  31 #include <linux/memblock.h>
  32 #include <linux/of_platform.h>
  33 #include <linux/hugetlb.h>
  34 #include <asm/debugfs.h>
  35 #include <asm/io.h>
  36 #include <asm/paca.h>
  37 #include <asm/prom.h>
  38 #include <asm/processor.h>
  39 #include <asm/vdso_datapage.h>
  40 #include <asm/pgtable.h>
  41 #include <asm/smp.h>
  42 #include <asm/elf.h>
  43 #include <asm/machdep.h>
  44 #include <asm/time.h>
  45 #include <asm/cputable.h>
  46 #include <asm/sections.h>
  47 #include <asm/firmware.h>
  48 #include <asm/btext.h>
  49 #include <asm/nvram.h>
  50 #include <asm/setup.h>
  51 #include <asm/rtas.h>
  52 #include <asm/iommu.h>
  53 #include <asm/serial.h>
  54 #include <asm/cache.h>
  55 #include <asm/page.h>
  56 #include <asm/mmu.h>
  57 #include <asm/xmon.h>
  58 #include <asm/cputhreads.h>
  59 #include <mm/mmu_decl.h>
  60 #include <asm/fadump.h>
  61 #include <asm/udbg.h>
  62 #include <asm/hugetlb.h>
  63 #include <asm/livepatch.h>
  64 #include <asm/mmu_context.h>
  65 #include <asm/cpu_has_feature.h>
  66 #include <asm/kasan.h>
  67
  68 #include "setup.h"
  69
  70 #ifdef DEBUG
  71 #include <asm/udbg.h>
  72 #define DBG(fmt...) udbg_printf(fmt)
  73 #else
  74 #define DBG(fmt...)
  75 #endif
  76
  77 /* The main machine-dep calls structure
  78  */
  79 struct machdep_calls ppc_md;
  80 EXPORT_SYMBOL(ppc_md);
  81 struct machdep_calls *machine_id;
  82 EXPORT_SYMBOL(machine_id);
  83
  84 int boot_cpuid = -1;
  85 EXPORT_SYMBOL_GPL(boot_cpuid);
  86
  87 /*
  88  * These are used in binfmt_elf.c to put aux entries on the stack
  89  * for each elf executable being started.
  90  */
  91 int dcache_bsize;
  92 int icache_bsize;
  93 int ucache_bsize;
  94
  95
  96 unsigned long klimit = (unsigned long) _end;
  97
  98 /*
  99  * This still seems to be needed... -- paulus
 100  */
 101 struct screen_info screen_info = {
 102         .orig_x = 0,
 103         .orig_y = 25,
 104         .orig_video_cols = 80,
 105         .orig_video_lines = 25,
 106         .orig_video_isVGA = 1,
 107         .orig_video_points = 16
 108 };
 109 #if defined(CONFIG_FB_VGA16_MODULE)
 110 EXPORT_SYMBOL(screen_info);
 111 #endif
 112
 113 /* Variables required to store legacy IO irq routing */
 114 int of_i8042_kbd_irq;
 115 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 116 int of_i8042_aux_irq;
 117 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 118
 119 #ifdef __DO_IRQ_CANON
 120 /* XXX should go elsewhere eventually */
 121 int ppc_do_canonicalize_irqs;
 122 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 123 #endif
 124
 125 #ifdef CONFIG_CRASH_CORE
 126 /* This keeps a track of which one is the crashing cpu. */
 127 int crashing_cpu = -1;
 128 #endif
 129
 130 /* also used by kexec */
 131 void machine_shutdown(void)
 132 {
 133         /*
 134          * if fadump is active, cleanup the fadump registration before we
 135          * shutdown.
 136          */
 137         fadump_cleanup();
 138
 139         if (ppc_md.machine_shutdown)
 140                 ppc_md.machine_shutdown();
 141 }
 142
 143 static void machine_hang(void)
 144 {
 145         pr_emerg("System Halted, OK to turn off power\n");
 146         local_irq_disable();
 147         while (1)
 148                 ;
 149 }
 150
 151 void machine_restart(char *cmd)
 152 {
 153         machine_shutdown();
 154         if (ppc_md.restart)
 155                 ppc_md.restart(cmd);
 156
 157         smp_send_stop();
 158
 159         do_kernel_restart(cmd);
 160         mdelay(1000);
 161
 162         machine_hang();
 163 }
 164
 165 void machine_power_off(void)
 166 {
 167         machine_shutdown();
 168         if (pm_power_off)
 169                 pm_power_off();
 170
 171         smp_send_stop();
 172         machine_hang();
 173 }
 174 /* Used by the G5 thermal driver */
 175 EXPORT_SYMBOL_GPL(machine_power_off);
 176
 177 void (*pm_power_off)(void);
 178 EXPORT_SYMBOL_GPL(pm_power_off);
 179
 180 void machine_halt(void)
 181 {
 182         machine_shutdown();
 183         if (ppc_md.halt)
 184                 ppc_md.halt();
 185
 186         smp_send_stop();
 187         machine_hang();
 188 }
 189
 190 #ifdef CONFIG_SMP
 191 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 192 #endif
 193
 194 static void show_cpuinfo_summary(struct seq_file *m)
 195 {
 196         struct device_node *root;
 197         const char *model = NULL;
 198         unsigned long bogosum = 0;
 199         int i;
 200
 201         if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
 202                 for_each_online_cpu(i)
 203                         bogosum += loops_per_jiffy;
 204                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 205                            bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
 206         }
 207         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 208         if (ppc_md.name)
 209                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 210         root = of_find_node_by_path("/");
 211         if (root)
 212                 model = of_get_property(root, "model", NULL);
 213         if (model)
 214                 seq_printf(m, "model\t\t: %s\n", model);
 215         of_node_put(root);
 216
 217         if (ppc_md.show_cpuinfo != NULL)
 218                 ppc_md.show_cpuinfo(m);
 219
 220         /* Display the amount of memory */
 221         if (IS_ENABLED(CONFIG_PPC32))
 222                 seq_printf(m, "Memory\t\t: %d MB\n",
 223                            (unsigned int)(total_memory / (1024 * 1024)));
 224 }
 225
 226 static int show_cpuinfo(struct seq_file *m, void *v)
 227 {
 228         unsigned long cpu_id = (unsigned long)v - 1;
 229         unsigned int pvr;
 230         unsigned long proc_freq;
 231         unsigned short maj;
 232         unsigned short min;
 233
 234 #ifdef CONFIG_SMP
 235         pvr = per_cpu(cpu_pvr, cpu_id);
 236 #else
 237         pvr = mfspr(SPRN_PVR);
 238 #endif
 239         maj = (pvr >> 8) & 0xFF;
 240         min = pvr & 0xFF;
 241
 242         seq_printf(m, "processor\t: %lu\n", cpu_id);
 243         seq_printf(m, "cpu\t\t: ");
 244
 245         if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
 246                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 247         else
 248                 seq_printf(m, "unknown (%08x)", pvr);
 249
 250         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 251                 seq_printf(m, ", altivec supported");
 252
 253         seq_printf(m, "\n");
 254
 255 #ifdef CONFIG_TAU
 256         if (cpu_has_feature(CPU_FTR_TAU)) {
 257                 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
 258                         /* more straightforward, but potentially misleading */
 259                         seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 260                                    cpu_temp(cpu_id));
 261                 } else {
 262                         /* show the actual temp sensor range */
 263                         u32 temp;
 264                         temp = cpu_temp_both(cpu_id);
 265                         seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 266                                    temp & 0xff, temp >> 16);
 267                 }
 268         }
 269 #endif /* CONFIG_TAU */
 270
 271         /*
 272          * Platforms that have variable clock rates, should implement
 273          * the method ppc_md.get_proc_freq() that reports the clock
 274          * rate of a given cpu. The rest can use ppc_proc_freq to
 275          * report the clock rate that is same across all cpus.
 276          */
 277         if (ppc_md.get_proc_freq)
 278                 proc_freq = ppc_md.get_proc_freq(cpu_id);
 279         else
 280                 proc_freq = ppc_proc_freq;
 281
 282         if (proc_freq)
 283                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 284                            proc_freq / 1000000, proc_freq % 1000000);
 285
 286         if (ppc_md.show_percpuinfo != NULL)
 287                 ppc_md.show_percpuinfo(m, cpu_id);
 288
 289         /* If we are a Freescale core do a simple check so
 290          * we dont have to keep adding cases in the future */
 291         if (PVR_VER(pvr) & 0x8000) {
 292                 switch (PVR_VER(pvr)) {
 293                 case 0x8000:    /* 7441/7450/7451, Voyager */
 294                 case 0x8001:    /* 7445/7455, Apollo 6 */
 295                 case 0x8002:    /* 7447/7457, Apollo 7 */
 296                 case 0x8003:    /* 7447A, Apollo 7 PM */
 297                 case 0x8004:    /* 7448, Apollo 8 */
 298                 case 0x800c:    /* 7410, Nitro */
 299                         maj = ((pvr >> 8) & 0xF);
 300                         min = PVR_MIN(pvr);
 301                         break;
 302                 default:        /* e500/book-e */
 303                         maj = PVR_MAJ(pvr);
 304                         min = PVR_MIN(pvr);
 305                         break;
 306                 }
 307         } else {
 308                 switch (PVR_VER(pvr)) {
 309                         case 0x0020:    /* 403 family */
 310                                 maj = PVR_MAJ(pvr) + 1;
 311                                 min = PVR_MIN(pvr);
 312                                 break;
 313                         case 0x1008:    /* 740P/750P ?? */
 314                                 maj = ((pvr >> 8) & 0xFF) - 1;
 315                                 min = pvr & 0xFF;
 316                                 break;
 317                         case 0x004e: /* POWER9 bits 12-15 give chip type */
 318                                 maj = (pvr >> 8) & 0x0F;
 319                                 min = pvr & 0xFF;
 320                                 break;
 321                         default:
 322                                 maj = (pvr >> 8) & 0xFF;
 323                                 min = pvr & 0xFF;
 324                                 break;
 325                 }
 326         }
 327
 328         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 329                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 330
 331         if (IS_ENABLED(CONFIG_PPC32))
 332                 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
 333                            (loops_per_jiffy / (5000 / HZ)) % 100);
 334
 335         seq_printf(m, "\n");
 336
 337         /* If this is the last cpu, print the summary */
 338         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 339                 show_cpuinfo_summary(m);
 340
 341         return 0;
 342 }
 343
 344 static void *c_start(struct seq_file *m, loff_t *pos)
 345 {
 346         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 347                 *pos = cpumask_first(cpu_online_mask);
 348         else
 349                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 350         if ((*pos) < nr_cpu_ids)
 351                 return (void *)(unsigned long)(*pos + 1);
 352         return NULL;
 353 }
 354
 355 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 356 {
 357         (*pos)++;
 358         return c_start(m, pos);
 359 }
 360
 361 static void c_stop(struct seq_file *m, void *v)
 362 {
 363 }
 364
 365 const struct seq_operations cpuinfo_op = {
 366         .start  = c_start,
 367         .next   = c_next,
 368         .stop   = c_stop,
 369         .show   = show_cpuinfo,
 370 };
 371
 372 void __init check_for_initrd(void)
 373 {
 374 #ifdef CONFIG_BLK_DEV_INITRD
 375         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 376             initrd_start, initrd_end);
 377
 378         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 379          * look sensible. If not, clear initrd reference.
 380          */
 381         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 382             initrd_end > initrd_start)
 383                 ROOT_DEV = Root_RAM0;
 384         else
 385                 initrd_start = initrd_end = 0;
 386
 387         if (initrd_start)
 388                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 389
 390         DBG(" <- check_for_initrd()\n");
 391 #endif /* CONFIG_BLK_DEV_INITRD */
 392 }
 393
 394 #ifdef CONFIG_SMP
 395
 396 int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
 397 cpumask_t threads_core_mask __read_mostly;
 398 EXPORT_SYMBOL_GPL(threads_per_core);
 399 EXPORT_SYMBOL_GPL(threads_per_subcore);
 400 EXPORT_SYMBOL_GPL(threads_shift);
 401 EXPORT_SYMBOL_GPL(threads_core_mask);
 402
 403 static void __init cpu_init_thread_core_maps(int tpc)
 404 {
 405         int i;
 406
 407         threads_per_core = tpc;
 408         threads_per_subcore = tpc;
 409         cpumask_clear(&threads_core_mask);
 410
 411         /* This implementation only supports power of 2 number of threads
 412          * for simplicity and performance
 413          */
 414         threads_shift = ilog2(tpc);
 415         BUG_ON(tpc != (1 << threads_shift));
 416
 417         for (i = 0; i < tpc; i++)
 418                 cpumask_set_cpu(i, &threads_core_mask);
 419
 420         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 421                tpc, tpc > 1 ? "s" : "");
 422         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 423 }
 424
 425
 426 u32 *cpu_to_phys_id = NULL;
 427
 428 /**
 429  * setup_cpu_maps - initialize the following cpu maps:
 430  *                  cpu_possible_mask
 431  *                  cpu_present_mask
 432  *
 433  * Having the possible map set up early allows us to restrict allocations
 434  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 435  *
 436  * We do not initialize the online map here; cpus set their own bits in
 437  * cpu_online_mask as they come up.
 438  *
 439  * This function is valid only for Open Firmware systems.  finish_device_tree
 440  * must be called before using this.
 441  *
 442  * While we're here, we may as well set the "physical" cpu ids in the paca.
 443  *
 444  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 445  */
 446 void __init smp_setup_cpu_maps(void)
 447 {
 448         struct device_node *dn;
 449         int cpu = 0;
 450         int nthreads = 1;
 451
 452         DBG("smp_setup_cpu_maps()\n");
 453
 454         cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
 455                                         __alignof__(u32));
 456         if (!cpu_to_phys_id)
 457                 panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
 458                       __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
 459
 460         for_each_node_by_type(dn, "cpu") {
 461                 const __be32 *intserv;
 462                 __be32 cpu_be;
 463                 int j, len;
 464
 465                 DBG("  * %pOF...\n", dn);
 466
 467                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 468                                 &len);
 469                 if (intserv) {
 470                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 471                             nthreads);
 472                 } else {
 473                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 474                         intserv = of_get_property(dn, "reg", &len);
 475                         if (!intserv) {
 476                                 cpu_be = cpu_to_be32(cpu);
 477                                 /* XXX: what is this? uninitialized?? */
 478                                 intserv = &cpu_be;      /* assume logical == phys */
 479                                 len = 4;
 480                         }
 481                 }
 482
 483                 nthreads = len / sizeof(int);
 484
 485                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 486                         bool avail;
 487
 488                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 489                             j, cpu, be32_to_cpu(intserv[j]));
 490
 491                         avail = of_device_is_available(dn);
 492                         if (!avail)
 493                                 avail = !of_property_match_string(dn,
 494                                                 "enable-method", "spin-table");
 495
 496                         set_cpu_present(cpu, avail);
 497                         set_cpu_possible(cpu, true);
 498                         cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
 499                         cpu++;
 500                 }
 501
 502                 if (cpu >= nr_cpu_ids) {
 503                         of_node_put(dn);
 504                         break;
 505                 }
 506         }
 507
 508         /* If no SMT supported, nthreads is forced to 1 */
 509         if (!cpu_has_feature(CPU_FTR_SMT)) {
 510                 DBG("  SMT disabled ! nthreads forced to 1\n");
 511                 nthreads = 1;
 512         }
 513
 514 #ifdef CONFIG_PPC64
 515         /*
 516          * On pSeries LPAR, we need to know how many cpus
 517          * could possibly be added to this partition.
 518          */
 519         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 520             (dn = of_find_node_by_path("/rtas"))) {
 521                 int num_addr_cell, num_size_cell, maxcpus;
 522                 const __be32 *ireg;
 523
 524                 num_addr_cell = of_n_addr_cells(dn);
 525                 num_size_cell = of_n_size_cells(dn);
 526
 527                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 528
 529                 if (!ireg)
 530                         goto out;
 531
 532                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 533
 534                 /* Double maxcpus for processors which have SMT capability */
 535                 if (cpu_has_feature(CPU_FTR_SMT))
 536                         maxcpus *= nthreads;
 537
 538                 if (maxcpus > nr_cpu_ids) {
 539                         printk(KERN_WARNING
 540                                "Partition configured for %d cpus, "
 541                                "operating system maximum is %u.\n",
 542                                maxcpus, nr_cpu_ids);
 543                         maxcpus = nr_cpu_ids;
 544                 } else
 545                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 546                                maxcpus);
 547
 548                 for (cpu = 0; cpu < maxcpus; cpu++)
 549                         set_cpu_possible(cpu, true);
 550         out:
 551                 of_node_put(dn);
 552         }
 553         vdso_data->processorCount = num_present_cpus();
 554 #endif /* CONFIG_PPC64 */
 555
 556         /* Initialize CPU <=> thread mapping/
 557          *
 558          * WARNING: We assume that the number of threads is the same for
 559          * every CPU in the system. If that is not the case, then some code
 560          * here will have to be reworked
 561          */
 562         cpu_init_thread_core_maps(nthreads);
 563
 564         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 565         setup_nr_cpu_ids();
 566
 567         free_unused_pacas();
 568 }
 569 #endif /* CONFIG_SMP */
 570
 571 #ifdef CONFIG_PCSPKR_PLATFORM
 572 static __init int add_pcspkr(void)
 573 {
 574         struct device_node *np;
 575         struct platform_device *pd;
 576         int ret;
 577
 578         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 579         of_node_put(np);
 580         if (!np)
 581                 return -ENODEV;
 582
 583         pd = platform_device_alloc("pcspkr", -1);
 584         if (!pd)
 585                 return -ENOMEM;
 586
 587         ret = platform_device_add(pd);
 588         if (ret)
 589                 platform_device_put(pd);
 590
 591         return ret;
 592 }
 593 device_initcall(add_pcspkr);
 594 #endif  /* CONFIG_PCSPKR_PLATFORM */
 595
 596 void probe_machine(void)
 597 {
 598         extern struct machdep_calls __machine_desc_start;
 599         extern struct machdep_calls __machine_desc_end;
 600         unsigned int i;
 601
 602         /*
 603          * Iterate all ppc_md structures until we find the proper
 604          * one for the current machine type
 605          */
 606         DBG("Probing machine type ...\n");
 607
 608         /*
 609          * Check ppc_md is empty, if not we have a bug, ie, we setup an
 610          * entry before probe_machine() which will be overwritten
 611          */
 612         for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
 613                 if (((void **)&ppc_md)[i]) {
 614                         printk(KERN_ERR "Entry %d in ppc_md non empty before"
 615                                " machine probe !\n", i);
 616                 }
 617         }
 618
 619         for (machine_id = &__machine_desc_start;
 620              machine_id < &__machine_desc_end;
 621              machine_id++) {
 622                 DBG("  %s ...", machine_id->name);
 623                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 624                 if (ppc_md.probe()) {
 625                         DBG(" match !\n");
 626                         break;
 627                 }
 628                 DBG("\n");
 629         }
 630         /* What can we do if we didn't find ? */
 631         if (machine_id >= &__machine_desc_end) {
 632                 pr_err("No suitable machine description found !\n");
 633                 for (;;);
 634         }
 635
 636         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 637 }
 638
 639 /* Match a class of boards, not a specific device configuration. */
 640 int check_legacy_ioport(unsigned long base_port)
 641 {
 642         struct device_node *parent, *np = NULL;
 643         int ret = -ENODEV;
 644
 645         switch(base_port) {
 646         case I8042_DATA_REG:
 647                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 648                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 649                 if (np) {
 650                         parent = of_get_parent(np);
 651
 652                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 653                         if (!of_i8042_kbd_irq)
 654                                 of_i8042_kbd_irq = 1;
 655
 656                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 657                         if (!of_i8042_aux_irq)
 658                                 of_i8042_aux_irq = 12;
 659
 660                         of_node_put(np);
 661                         np = parent;
 662                         break;
 663                 }
 664                 np = of_find_node_by_type(NULL, "8042");
 665                 /* Pegasos has no device_type on its 8042 node, look for the
 666                  * name instead */
 667                 if (!np)
 668                         np = of_find_node_by_name(NULL, "8042");
 669                 if (np) {
 670                         of_i8042_kbd_irq = 1;
 671                         of_i8042_aux_irq = 12;
 672                 }
 673                 break;
 674         case FDC_BASE: /* FDC1 */
 675                 np = of_find_node_by_type(NULL, "fdc");
 676                 break;
 677         default:
 678                 /* ipmi is supposed to fail here */
 679                 break;
 680         }
 681         if (!np)
 682                 return ret;
 683         parent = of_get_parent(np);
 684         if (parent) {
 685                 if (of_node_is_type(parent, "isa"))
 686                         ret = 0;
 687                 of_node_put(parent);
 688         }
 689         of_node_put(np);
 690         return ret;
 691 }
 692 EXPORT_SYMBOL(check_legacy_ioport);
 693
 694 static int ppc_panic_event(struct notifier_block *this,
 695                              unsigned long event, void *ptr)
 696 {
 697         /*
 698          * panic does a local_irq_disable, but we really
 699          * want interrupts to be hard disabled.
 700          */
 701         hard_irq_disable();
 702
 703         /*
 704          * If firmware-assisted dump has been registered then trigger
 705          * firmware-assisted dump and let firmware handle everything else.
 706          */
 707         crash_fadump(NULL, ptr);
 708         if (ppc_md.panic)
 709                 ppc_md.panic(ptr);  /* May not return */
 710         return NOTIFY_DONE;
 711 }
 712
 713 static struct notifier_block ppc_panic_block = {
 714         .notifier_call = ppc_panic_event,
 715         .priority = INT_MIN /* may not return; must be done last */
 716 };
 717
 718 /*
 719  * Dump out kernel offset information on panic.
 720  */
 721 static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
 722                               void *p)
 723 {
 724         pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
 725                  kaslr_offset(), KERNELBASE);
 726
 727         return 0;
 728 }
 729
 730 static struct notifier_block kernel_offset_notifier = {
 731         .notifier_call = dump_kernel_offset
 732 };
 733
 734 void __init setup_panic(void)
 735 {
 736         if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
 737                 atomic_notifier_chain_register(&panic_notifier_list,
 738                                                &kernel_offset_notifier);
 739
 740         /* PPC64 always does a hard irq disable in its panic handler */
 741         if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
 742                 return;
 743         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 744 }
 745
 746 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 747 /*
 748  * For platforms that have configurable cache-coherency.  This function
 749  * checks that the cache coherency setting of the kernel matches the setting
 750  * left by the firmware, as indicated in the device tree.  Since a mismatch
 751  * will eventually result in DMA failures, we print * and error and call
 752  * BUG() in that case.
 753  */
 754
 755 #define KERNEL_COHERENCY        (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
 756
 757 static int __init check_cache_coherency(void)
 758 {
 759         struct device_node *np;
 760         const void *prop;
 761         bool devtree_coherency;
 762
 763         np = of_find_node_by_path("/");
 764         prop = of_get_property(np, "coherency-off", NULL);
 765         of_node_put(np);
 766
 767         devtree_coherency = prop ? false : true;
 768
 769         if (devtree_coherency != KERNEL_COHERENCY) {
 770                 printk(KERN_ERR
 771                         "kernel coherency:%s != device tree_coherency:%s\n",
 772                         KERNEL_COHERENCY ? "on" : "off",
 773                         devtree_coherency ? "on" : "off");
 774                 BUG();
 775         }
 776
 777         return 0;
 778 }
 779
 780 late_initcall(check_cache_coherency);
 781 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 782
 783 #ifdef CONFIG_DEBUG_FS
 784 struct dentry *powerpc_debugfs_root;
 785 EXPORT_SYMBOL(powerpc_debugfs_root);
 786
 787 static int powerpc_debugfs_init(void)
 788 {
 789         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 790
 791         return powerpc_debugfs_root == NULL;
 792 }
 793 arch_initcall(powerpc_debugfs_init);
 794 #endif
 795
 796 void ppc_printk_progress(char *s, unsigned short hex)
 797 {
 798         pr_info("%s\n", s);
 799 }
 800
 801 static __init void print_system_info(void)
 802 {
 803         pr_info("-----------------------------------------------------\n");
 804         pr_info("phys_mem_size     = 0x%llx\n",
 805                 (unsigned long long)memblock_phys_mem_size());
 806
 807         pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 808         pr_info("icache_bsize      = 0x%x\n", icache_bsize);
 809         if (ucache_bsize != 0)
 810                 pr_info("ucache_bsize      = 0x%x\n", ucache_bsize);
 811
 812         pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 813         pr_info("  possible        = 0x%016lx\n",
 814                 (unsigned long)CPU_FTRS_POSSIBLE);
 815         pr_info("  always          = 0x%016lx\n",
 816                 (unsigned long)CPU_FTRS_ALWAYS);
 817         pr_info("cpu_user_features = 0x%08x 0x%08x\n",
 818                 cur_cpu_spec->cpu_user_features,
 819                 cur_cpu_spec->cpu_user_features2);
 820         pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
 821 #ifdef CONFIG_PPC64
 822         pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 823 #ifdef CONFIG_PPC_BOOK3S
 824         pr_info("vmalloc start     = 0x%lx\n", KERN_VIRT_START);
 825         pr_info("IO start          = 0x%lx\n", KERN_IO_START);
 826         pr_info("vmemmap start     = 0x%lx\n", (unsigned long)vmemmap);
 827 #endif
 828 #endif
 829
 830         if (!early_radix_enabled())
 831                 print_system_hash_info();
 832
 833         if (PHYSICAL_START > 0)
 834                 pr_info("physical_start    = 0x%llx\n",
 835                        (unsigned long long)PHYSICAL_START);
 836         pr_info("-----------------------------------------------------\n");
 837 }
 838
 839 #ifdef CONFIG_SMP
 840 static void smp_setup_pacas(void)
 841 {
 842         int cpu;
 843
 844         for_each_possible_cpu(cpu) {
 845                 if (cpu == smp_processor_id())
 846                         continue;
 847                 allocate_paca(cpu);
 848                 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
 849         }
 850
 851         memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
 852         cpu_to_phys_id = NULL;
 853 }
 854 #endif
 855
 856 /*
 857  * Called into from start_kernel this initializes memblock, which is used
 858  * to manage page allocation until mem_init is called.
 859  */
 860 void __init setup_arch(char **cmdline_p)
 861 {
 862         kasan_init();
 863
 864         *cmdline_p = boot_command_line;
 865
 866         /* Set a half-reasonable default so udelay does something sensible */
 867         loops_per_jiffy = 500000000 / HZ;
 868
 869         /* Unflatten the device-tree passed by prom_init or kexec */
 870         unflatten_device_tree();
 871
 872         /*
 873          * Initialize cache line/block info from device-tree (on ppc64) or
 874          * just cputable (on ppc32).
 875          */
 876         initialize_cache_info();
 877
 878         /* Initialize RTAS if available. */
 879         rtas_initialize();
 880
 881         /* Check if we have an initrd provided via the device-tree. */
 882         check_for_initrd();
 883
 884         /* Probe the machine type, establish ppc_md. */
 885         probe_machine();
 886
 887         /* Setup panic notifier if requested by the platform. */
 888         setup_panic();
 889
 890         /*
 891          * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
 892          * it from their respective probe() function.
 893          */
 894         setup_power_save();
 895
 896         /* Discover standard serial ports. */
 897         find_legacy_serial_ports();
 898
 899         /* Register early console with the printk subsystem. */
 900         register_early_udbg_console();
 901
 902         /* Setup the various CPU maps based on the device-tree. */
 903         smp_setup_cpu_maps();
 904
 905         /* Initialize xmon. */
 906         xmon_setup();
 907
 908         /* Check the SMT related command line arguments (ppc64). */
 909         check_smt_enabled();
 910
 911         /* Parse memory topology */
 912         mem_topology_setup();
 913
 914         /*
 915          * Release secondary cpus out of their spinloops at 0x60 now that
 916          * we can map physical -> logical CPU ids.
 917          *
 918          * Freescale Book3e parts spin in a loop provided by firmware,
 919          * so smp_release_cpus() does nothing for them.
 920          */
 921 #ifdef CONFIG_SMP
 922         smp_setup_pacas();
 923
 924         /* On BookE, setup per-core TLB data structures. */
 925         setup_tlb_core_data();
 926
 927         smp_release_cpus();
 928 #endif
 929
 930         /* Print various info about the machine that has been gathered so far. */
 931         print_system_info();
 932
 933         /* Reserve large chunks of memory for use by CMA for KVM. */
 934         kvm_cma_reserve();
 935
 936         klp_init_thread_info(&init_task);
 937
 938         init_mm.start_code = (unsigned long)_stext;
 939         init_mm.end_code = (unsigned long) _etext;
 940         init_mm.end_data = (unsigned long) _edata;
 941         init_mm.brk = klimit;
 942
 943         mm_iommu_init(&init_mm);
 944         irqstack_early_init();
 945         exc_lvl_early_init();
 946         emergency_stack_init();
 947
 948         initmem_init();
 949
 950         early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
 951
 952         if (ppc_md.setup_arch)
 953                 ppc_md.setup_arch();
 954
 955         setup_barrier_nospec();
 956         setup_spectre_v2();
 957
 958         paging_init();
 959
 960         /* Initialize the MMU context management stuff. */
 961         mmu_context_init();
 962
 963         /* Interrupt code needs to be 64K-aligned. */
 964         if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
 965                 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
 966                       (unsigned long)_stext);
 967 }