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/panic_notifier.h>
  13 #include <linux/string.h>
  14 #include <linux/sched.h>
  15 #include <linux/init.h>
  16 #include <linux/kernel.h>
  17 #include <linux/reboot.h>
  18 #include <linux/delay.h>
  19 #include <linux/initrd.h>
  20 #include <linux/platform_device.h>
  21 #include <linux/printk.h>
  22 #include <linux/seq_file.h>
  23 #include <linux/ioport.h>
  24 #include <linux/console.h>
  25 #include <linux/root_dev.h>
  26 #include <linux/cpu.h>
  27 #include <linux/unistd.h>
  28 #include <linux/seq_buf.h>
  29 #include <linux/serial.h>
  30 #include <linux/serial_8250.h>
  31 #include <linux/percpu.h>
  32 #include <linux/memblock.h>
  33 #include <linux/of.h>
  34 #include <linux/of_fdt.h>
  35 #include <linux/of_irq.h>
  36 #include <linux/hugetlb.h>
  37 #include <linux/pgtable.h>
  38 #include <asm/io.h>
  39 #include <asm/paca.h>
  40 #include <asm/processor.h>
  41 #include <asm/vdso_datapage.h>
  42 #include <asm/smp.h>
  43 #include <asm/elf.h>
  44 #include <asm/machdep.h>
  45 #include <asm/time.h>
  46 #include <asm/cputable.h>
  47 #include <asm/sections.h>
  48 #include <asm/firmware.h>
  49 #include <asm/btext.h>
  50 #include <asm/nvram.h>
  51 #include <asm/setup.h>
  52 #include <asm/rtas.h>
  53 #include <asm/iommu.h>
  54 #include <asm/serial.h>
  55 #include <asm/cache.h>
  56 #include <asm/page.h>
  57 #include <asm/mmu.h>
  58 #include <asm/xmon.h>
  59 #include <asm/cputhreads.h>
  60 #include <mm/mmu_decl.h>
  61 #include <asm/archrandom.h>
  62 #include <asm/fadump.h>
  63 #include <asm/udbg.h>
  64 #include <asm/hugetlb.h>
  65 #include <asm/livepatch.h>
  66 #include <asm/mmu_context.h>
  67 #include <asm/cpu_has_feature.h>
  68 #include <asm/kasan.h>
  69 #include <asm/mce.h>
  70 #include <asm/systemcfg.h>
  71
  72 #include "setup.h"
  73
  74 #ifdef DEBUG
  75 #define DBG(fmt...) udbg_printf(fmt)
  76 #else
  77 #define DBG(fmt...)
  78 #endif
  79
  80 /* The main machine-dep calls structure
  81  */
  82 struct machdep_calls ppc_md;
  83 EXPORT_SYMBOL(ppc_md);
  84 struct machdep_calls *machine_id;
  85 EXPORT_SYMBOL(machine_id);
  86
  87 int boot_cpuid = -1;
  88 EXPORT_SYMBOL_GPL(boot_cpuid);
  89 int __initdata boot_core_hwid = -1;
  90
  91 #ifdef CONFIG_PPC64
  92 int boot_cpu_hwid = -1;
  93 #endif
  94
  95 /*
  96  * These are used in binfmt_elf.c to put aux entries on the stack
  97  * for each elf executable being started.
  98  */
  99 int dcache_bsize;
 100 int icache_bsize;
 101
 102 /* Variables required to store legacy IO irq routing */
 103 int of_i8042_kbd_irq;
 104 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 105 int of_i8042_aux_irq;
 106 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 107
 108 #ifdef __DO_IRQ_CANON
 109 /* XXX should go elsewhere eventually */
 110 int ppc_do_canonicalize_irqs;
 111 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 112 #endif
 113
 114 #ifdef CONFIG_CRASH_DUMP
 115 /* This keeps a track of which one is the crashing cpu. */
 116 int crashing_cpu = -1;
 117 #endif
 118
 119 /* also used by kexec */
 120 void machine_shutdown(void)
 121 {
 122         /*
 123          * if fadump is active, cleanup the fadump registration before we
 124          * shutdown.
 125          */
 126         fadump_cleanup();
 127
 128         if (ppc_md.machine_shutdown)
 129                 ppc_md.machine_shutdown();
 130 }
 131
 132 static void machine_hang(void)
 133 {
 134         pr_emerg("System Halted, OK to turn off power\n");
 135         local_irq_disable();
 136         while (1)
 137                 ;
 138 }
 139
 140 void machine_restart(char *cmd)
 141 {
 142         machine_shutdown();
 143         if (ppc_md.restart)
 144                 ppc_md.restart(cmd);
 145
 146         smp_send_stop();
 147
 148         do_kernel_restart(cmd);
 149         mdelay(1000);
 150
 151         machine_hang();
 152 }
 153
 154 void machine_power_off(void)
 155 {
 156         machine_shutdown();
 157         do_kernel_power_off();
 158         smp_send_stop();
 159         machine_hang();
 160 }
 161 /* Used by the G5 thermal driver */
 162 EXPORT_SYMBOL_GPL(machine_power_off);
 163
 164 void (*pm_power_off)(void);
 165 EXPORT_SYMBOL_GPL(pm_power_off);
 166
 167 size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs)
 168 {
 169         if (max_longs && ppc_md.get_random_seed && ppc_md.get_random_seed(v))
 170                 return 1;
 171         return 0;
 172 }
 173 EXPORT_SYMBOL(arch_get_random_seed_longs);
 174
 175 void machine_halt(void)
 176 {
 177         machine_shutdown();
 178         if (ppc_md.halt)
 179                 ppc_md.halt();
 180
 181         smp_send_stop();
 182         machine_hang();
 183 }
 184
 185 #ifdef CONFIG_SMP
 186 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 187 #endif
 188
 189 static void show_cpuinfo_summary(struct seq_file *m)
 190 {
 191         struct device_node *root;
 192         const char *model = NULL;
 193         unsigned long bogosum = 0;
 194         int i;
 195
 196         if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
 197                 for_each_online_cpu(i)
 198                         bogosum += loops_per_jiffy;
 199                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 200                            bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
 201         }
 202         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 203         if (ppc_md.name)
 204                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 205         root = of_find_node_by_path("/");
 206         if (root)
 207                 model = of_get_property(root, "model", NULL);
 208         if (model)
 209                 seq_printf(m, "model\t\t: %s\n", model);
 210         of_node_put(root);
 211
 212         if (ppc_md.show_cpuinfo != NULL)
 213                 ppc_md.show_cpuinfo(m);
 214
 215         /* Display the amount of memory */
 216         if (IS_ENABLED(CONFIG_PPC32))
 217                 seq_printf(m, "Memory\t\t: %d MB\n",
 218                            (unsigned int)(total_memory / (1024 * 1024)));
 219 }
 220
 221 static int show_cpuinfo(struct seq_file *m, void *v)
 222 {
 223         unsigned long cpu_id = (unsigned long)v - 1;
 224         unsigned int pvr;
 225         unsigned long proc_freq;
 226         unsigned short maj;
 227         unsigned short min;
 228
 229 #ifdef CONFIG_SMP
 230         pvr = per_cpu(cpu_pvr, cpu_id);
 231 #else
 232         pvr = mfspr(SPRN_PVR);
 233 #endif
 234         maj = (pvr >> 8) & 0xFF;
 235         min = pvr & 0xFF;
 236
 237         seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id);
 238
 239         if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
 240                 seq_puts(m, cur_cpu_spec->cpu_name);
 241         else
 242                 seq_printf(m, "unknown (%08x)", pvr);
 243
 244         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 245                 seq_puts(m, ", altivec supported");
 246
 247         seq_putc(m, '\n');
 248
 249 #ifdef CONFIG_TAU
 250         if (cpu_has_feature(CPU_FTR_TAU)) {
 251                 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
 252                         /* more straightforward, but potentially misleading */
 253                         seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 254                                    cpu_temp(cpu_id));
 255                 } else {
 256                         /* show the actual temp sensor range */
 257                         u32 temp;
 258                         temp = cpu_temp_both(cpu_id);
 259                         seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 260                                    temp & 0xff, temp >> 16);
 261                 }
 262         }
 263 #endif /* CONFIG_TAU */
 264
 265         /*
 266          * Platforms that have variable clock rates, should implement
 267          * the method ppc_md.get_proc_freq() that reports the clock
 268          * rate of a given cpu. The rest can use ppc_proc_freq to
 269          * report the clock rate that is same across all cpus.
 270          */
 271         if (ppc_md.get_proc_freq)
 272                 proc_freq = ppc_md.get_proc_freq(cpu_id);
 273         else
 274                 proc_freq = ppc_proc_freq;
 275
 276         if (proc_freq)
 277                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 278                            proc_freq / 1000000, proc_freq % 1000000);
 279
 280         /* If we are a Freescale core do a simple check so
 281          * we don't have to keep adding cases in the future */
 282         if (PVR_VER(pvr) & 0x8000) {
 283                 switch (PVR_VER(pvr)) {
 284                 case 0x8000:    /* 7441/7450/7451, Voyager */
 285                 case 0x8001:    /* 7445/7455, Apollo 6 */
 286                 case 0x8002:    /* 7447/7457, Apollo 7 */
 287                 case 0x8003:    /* 7447A, Apollo 7 PM */
 288                 case 0x8004:    /* 7448, Apollo 8 */
 289                 case 0x800c:    /* 7410, Nitro */
 290                         maj = ((pvr >> 8) & 0xF);
 291                         min = PVR_MIN(pvr);
 292                         break;
 293                 default:        /* e500/book-e */
 294                         maj = PVR_MAJ(pvr);
 295                         min = PVR_MIN(pvr);
 296                         break;
 297                 }
 298         } else {
 299                 switch (PVR_VER(pvr)) {
 300                         case 0x1008:    /* 740P/750P ?? */
 301                                 maj = ((pvr >> 8) & 0xFF) - 1;
 302                                 min = pvr & 0xFF;
 303                                 break;
 304                         case 0x004e: /* POWER9 bits 12-15 give chip type */
 305                         case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
 306                                 maj = (pvr >> 8) & 0x0F;
 307                                 min = pvr & 0xFF;
 308                                 break;
 309                         default:
 310                                 maj = (pvr >> 8) & 0xFF;
 311                                 min = pvr & 0xFF;
 312                                 break;
 313                 }
 314         }
 315
 316         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 317                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 318
 319         if (IS_ENABLED(CONFIG_PPC32))
 320                 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
 321                            (loops_per_jiffy / (5000 / HZ)) % 100);
 322
 323         seq_putc(m, '\n');
 324
 325         /* If this is the last cpu, print the summary */
 326         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 327                 show_cpuinfo_summary(m);
 328
 329         return 0;
 330 }
 331
 332 static void *c_start(struct seq_file *m, loff_t *pos)
 333 {
 334         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 335                 *pos = cpumask_first(cpu_online_mask);
 336         else
 337                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 338         if ((*pos) < nr_cpu_ids)
 339                 return (void *)(unsigned long)(*pos + 1);
 340         return NULL;
 341 }
 342
 343 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 344 {
 345         (*pos)++;
 346         return c_start(m, pos);
 347 }
 348
 349 static void c_stop(struct seq_file *m, void *v)
 350 {
 351 }
 352
 353 const struct seq_operations cpuinfo_op = {
 354         .start  = c_start,
 355         .next   = c_next,
 356         .stop   = c_stop,
 357         .show   = show_cpuinfo,
 358 };
 359
 360 void __init check_for_initrd(void)
 361 {
 362 #ifdef CONFIG_BLK_DEV_INITRD
 363         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 364             initrd_start, initrd_end);
 365
 366         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 367          * look sensible. If not, clear initrd reference.
 368          */
 369         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 370             initrd_end > initrd_start)
 371                 ROOT_DEV = Root_RAM0;
 372         else
 373                 initrd_start = initrd_end = 0;
 374
 375         if (initrd_start)
 376                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 377
 378         DBG(" <- check_for_initrd()\n");
 379 #endif /* CONFIG_BLK_DEV_INITRD */
 380 }
 381
 382 #ifdef CONFIG_SMP
 383
 384 int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
 385 cpumask_t threads_core_mask __read_mostly;
 386 EXPORT_SYMBOL_GPL(threads_per_core);
 387 EXPORT_SYMBOL_GPL(threads_per_subcore);
 388 EXPORT_SYMBOL_GPL(threads_shift);
 389 EXPORT_SYMBOL_GPL(threads_core_mask);
 390
 391 static void __init cpu_init_thread_core_maps(int tpc)
 392 {
 393         int i;
 394
 395         threads_per_core = tpc;
 396         threads_per_subcore = tpc;
 397         cpumask_clear(&threads_core_mask);
 398
 399         /* This implementation only supports power of 2 number of threads
 400          * for simplicity and performance
 401          */
 402         threads_shift = ilog2(tpc);
 403         BUG_ON(tpc != (1 << threads_shift));
 404
 405         for (i = 0; i < tpc; i++)
 406                 cpumask_set_cpu(i, &threads_core_mask);
 407
 408         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 409                tpc, str_plural(tpc));
 410         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 411 }
 412
 413
 414 u32 *cpu_to_phys_id = NULL;
 415
 416 static int assign_threads(unsigned int cpu, unsigned int nthreads, bool present,
 417                           const __be32 *hw_ids)
 418 {
 419         for (int i = 0; i < nthreads && cpu < nr_cpu_ids; i++) {
 420                 __be32 hwid;
 421
 422                 hwid = be32_to_cpu(hw_ids[i]);
 423
 424                 DBG("    thread %d -> cpu %d (hard id %d)\n", i, cpu, hwid);
 425
 426                 set_cpu_present(cpu, present);
 427                 set_cpu_possible(cpu, true);
 428                 cpu_to_phys_id[cpu] = hwid;
 429                 cpu++;
 430         }
 431
 432         return cpu;
 433 }
 434
 435 /**
 436  * setup_cpu_maps - initialize the following cpu maps:
 437  *                  cpu_possible_mask
 438  *                  cpu_present_mask
 439  *
 440  * Having the possible map set up early allows us to restrict allocations
 441  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 442  *
 443  * We do not initialize the online map here; cpus set their own bits in
 444  * cpu_online_mask as they come up.
 445  *
 446  * This function is valid only for Open Firmware systems.  finish_device_tree
 447  * must be called before using this.
 448  *
 449  * While we're here, we may as well set the "physical" cpu ids in the paca.
 450  *
 451  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 452  */
 453 void __init smp_setup_cpu_maps(void)
 454 {
 455         struct device_node *dn;
 456         int cpu = 0;
 457         int nthreads = 1;
 458
 459         DBG("smp_setup_cpu_maps()\n");
 460
 461         cpu_to_phys_id = memblock_alloc_or_panic(nr_cpu_ids * sizeof(u32),
 462                                         __alignof__(u32));
 463
 464         for_each_node_by_type(dn, "cpu") {
 465                 const __be32 *intserv;
 466                 __be32 cpu_be;
 467                 int len;
 468
 469                 DBG("  * %pOF...\n", dn);
 470
 471                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 472                                 &len);
 473                 if (intserv) {
 474                         DBG("    ibm,ppc-interrupt-server#s -> %lu threads\n",
 475                             (len / sizeof(int)));
 476                 } else {
 477                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 478                         intserv = of_get_property(dn, "reg", &len);
 479                         if (!intserv) {
 480                                 cpu_be = cpu_to_be32(cpu);
 481                                 /* XXX: what is this? uninitialized?? */
 482                                 intserv = &cpu_be;      /* assume logical == phys */
 483                                 len = 4;
 484                         }
 485                 }
 486
 487                 nthreads = len / sizeof(int);
 488
 489                 bool avail = of_device_is_available(dn);
 490                 if (!avail)
 491                         avail = !of_property_match_string(dn,
 492                                         "enable-method", "spin-table");
 493
 494                 if (boot_core_hwid >= 0) {
 495                         if (cpu == 0) {
 496                                 pr_info("Skipping CPU node %pOF to allow for boot core.\n", dn);
 497                                 cpu = nthreads;
 498                                 continue;
 499                         }
 500
 501                         if (be32_to_cpu(intserv[0]) == boot_core_hwid) {
 502                                 pr_info("Renumbered boot core %pOF to logical 0\n", dn);
 503                                 assign_threads(0, nthreads, avail, intserv);
 504                                 of_node_put(dn);
 505                                 break;
 506                         }
 507                 } else if (cpu >= nr_cpu_ids) {
 508                         of_node_put(dn);
 509                         break;
 510                 }
 511
 512                 if (cpu < nr_cpu_ids)
 513                         cpu = assign_threads(cpu, nthreads, avail, intserv);
 514         }
 515
 516         /* If no SMT supported, nthreads is forced to 1 */
 517         if (!cpu_has_feature(CPU_FTR_SMT)) {
 518                 DBG("  SMT disabled ! nthreads forced to 1\n");
 519                 nthreads = 1;
 520         }
 521
 522 #ifdef CONFIG_PPC64
 523         /*
 524          * On pSeries LPAR, we need to know how many cpus
 525          * could possibly be added to this partition.
 526          */
 527         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 528             (dn = of_find_node_by_path("/rtas"))) {
 529                 int num_addr_cell, num_size_cell, maxcpus;
 530                 const __be32 *ireg;
 531
 532                 num_addr_cell = of_n_addr_cells(dn);
 533                 num_size_cell = of_n_size_cells(dn);
 534
 535                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 536
 537                 if (!ireg)
 538                         goto out;
 539
 540                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 541
 542                 /* Double maxcpus for processors which have SMT capability */
 543                 if (cpu_has_feature(CPU_FTR_SMT))
 544                         maxcpus *= nthreads;
 545
 546                 if (maxcpus > nr_cpu_ids) {
 547                         printk(KERN_WARNING
 548                                "Partition configured for %d cpus, "
 549                                "operating system maximum is %u.\n",
 550                                maxcpus, nr_cpu_ids);
 551                         maxcpus = nr_cpu_ids;
 552                 } else
 553                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 554                                maxcpus);
 555
 556                 for (cpu = 0; cpu < maxcpus; cpu++)
 557                         set_cpu_possible(cpu, true);
 558         out:
 559                 of_node_put(dn);
 560         }
 561 #endif
 562 #ifdef CONFIG_PPC64_PROC_SYSTEMCFG
 563         systemcfg->processorCount = num_present_cpus();
 564 #endif /* CONFIG_PPC64 */
 565
 566         /* Initialize CPU <=> thread mapping/
 567          *
 568          * WARNING: We assume that the number of threads is the same for
 569          * every CPU in the system. If that is not the case, then some code
 570          * here will have to be reworked
 571          */
 572         cpu_init_thread_core_maps(nthreads);
 573
 574         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 575         setup_nr_cpu_ids();
 576
 577         free_unused_pacas();
 578 }
 579 #endif /* CONFIG_SMP */
 580
 581 #ifdef CONFIG_PCSPKR_PLATFORM
 582 static __init int add_pcspkr(void)
 583 {
 584         struct device_node *np;
 585         struct platform_device *pd;
 586         int ret;
 587
 588         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 589         of_node_put(np);
 590         if (!np)
 591                 return -ENODEV;
 592
 593         pd = platform_device_alloc("pcspkr", -1);
 594         if (!pd)
 595                 return -ENOMEM;
 596
 597         ret = platform_device_add(pd);
 598         if (ret)
 599                 platform_device_put(pd);
 600
 601         return ret;
 602 }
 603 device_initcall(add_pcspkr);
 604 #endif  /* CONFIG_PCSPKR_PLATFORM */
 605
 606 static char ppc_hw_desc_buf[128] __initdata;
 607
 608 struct seq_buf ppc_hw_desc __initdata = {
 609         .buffer = ppc_hw_desc_buf,
 610         .size = sizeof(ppc_hw_desc_buf),
 611         .len = 0,
 612 };
 613
 614 static __init void probe_machine(void)
 615 {
 616         extern struct machdep_calls __machine_desc_start;
 617         extern struct machdep_calls __machine_desc_end;
 618         unsigned int i;
 619
 620         /*
 621          * Iterate all ppc_md structures until we find the proper
 622          * one for the current machine type
 623          */
 624         DBG("Probing machine type ...\n");
 625
 626         /*
 627          * Check ppc_md is empty, if not we have a bug, ie, we setup an
 628          * entry before probe_machine() which will be overwritten
 629          */
 630         for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
 631                 if (((void **)&ppc_md)[i]) {
 632                         printk(KERN_ERR "Entry %d in ppc_md non empty before"
 633                                " machine probe !\n", i);
 634                 }
 635         }
 636
 637         for (machine_id = &__machine_desc_start;
 638              machine_id < &__machine_desc_end;
 639              machine_id++) {
 640                 DBG("  %s ...\n", machine_id->name);
 641                 if (machine_id->compatible && !of_machine_is_compatible(machine_id->compatible))
 642                         continue;
 643                 if (machine_id->compatibles && !of_machine_compatible_match(machine_id->compatibles))
 644                         continue;
 645                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 646                 if (ppc_md.probe && !ppc_md.probe())
 647                         continue;
 648                 DBG("   %s match !\n", machine_id->name);
 649                 break;
 650         }
 651         /* What can we do if we didn't find ? */
 652         if (machine_id >= &__machine_desc_end) {
 653                 pr_err("No suitable machine description found !\n");
 654                 for (;;);
 655         }
 656
 657         // Append the machine name to other info we've gathered
 658         seq_buf_puts(&ppc_hw_desc, ppc_md.name);
 659
 660         // Set the generic hardware description shown in oopses
 661         dump_stack_set_arch_desc(ppc_hw_desc.buffer);
 662
 663         pr_info("Hardware name: %s\n", ppc_hw_desc.buffer);
 664 }
 665
 666 /* Match a class of boards, not a specific device configuration. */
 667 int check_legacy_ioport(unsigned long base_port)
 668 {
 669         struct device_node *parent, *np = NULL;
 670         int ret = -ENODEV;
 671
 672         switch(base_port) {
 673         case I8042_DATA_REG:
 674                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 675                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 676                 if (np) {
 677                         parent = of_get_parent(np);
 678
 679                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 680                         if (!of_i8042_kbd_irq)
 681                                 of_i8042_kbd_irq = 1;
 682
 683                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 684                         if (!of_i8042_aux_irq)
 685                                 of_i8042_aux_irq = 12;
 686
 687                         of_node_put(np);
 688                         np = parent;
 689                         break;
 690                 }
 691                 np = of_find_node_by_type(NULL, "8042");
 692                 /* Pegasos has no device_type on its 8042 node, look for the
 693                  * name instead */
 694                 if (!np)
 695                         np = of_find_node_by_name(NULL, "8042");
 696                 if (np) {
 697                         of_i8042_kbd_irq = 1;
 698                         of_i8042_aux_irq = 12;
 699                 }
 700                 break;
 701         case FDC_BASE: /* FDC1 */
 702                 np = of_find_node_by_type(NULL, "fdc");
 703                 break;
 704         default:
 705                 /* ipmi is supposed to fail here */
 706                 break;
 707         }
 708         if (!np)
 709                 return ret;
 710         parent = of_get_parent(np);
 711         if (parent) {
 712                 if (of_node_is_type(parent, "isa"))
 713                         ret = 0;
 714                 of_node_put(parent);
 715         }
 716         of_node_put(np);
 717         return ret;
 718 }
 719 EXPORT_SYMBOL(check_legacy_ioport);
 720
 721 /*
 722  * Panic notifiers setup
 723  *
 724  * We have 3 notifiers for powerpc, each one from a different "nature":
 725  *
 726  * - ppc_panic_fadump_handler() is a hypervisor notifier, which hard-disables
 727  *   IRQs and deal with the Firmware-Assisted dump, when it is configured;
 728  *   should run early in the panic path.
 729  *
 730  * - dump_kernel_offset() is an informative notifier, just showing the KASLR
 731  *   offset if we have RANDOMIZE_BASE set.
 732  *
 733  * - ppc_panic_platform_handler() is a low-level handler that's registered
 734  *   only if the platform wishes to perform final actions in the panic path,
 735  *   hence it should run late and might not even return. Currently, only
 736  *   pseries and ps3 platforms register callbacks.
 737  */
 738 static int ppc_panic_fadump_handler(struct notifier_block *this,
 739                                     unsigned long event, void *ptr)
 740 {
 741         /*
 742          * panic does a local_irq_disable, but we really
 743          * want interrupts to be hard disabled.
 744          */
 745         hard_irq_disable();
 746
 747         /*
 748          * If firmware-assisted dump has been registered then trigger
 749          * its callback and let the firmware handles everything else.
 750          */
 751         crash_fadump(NULL, ptr);
 752
 753         return NOTIFY_DONE;
 754 }
 755
 756 static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
 757                               void *p)
 758 {
 759         pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
 760                  kaslr_offset(), KERNELBASE);
 761
 762         return NOTIFY_DONE;
 763 }
 764
 765 static int ppc_panic_platform_handler(struct notifier_block *this,
 766                                       unsigned long event, void *ptr)
 767 {
 768         /*
 769          * This handler is only registered if we have a panic callback
 770          * on ppc_md, hence NULL check is not needed.
 771          * Also, it may not return, so it runs really late on panic path.
 772          */
 773         ppc_md.panic(ptr);
 774
 775         return NOTIFY_DONE;
 776 }
 777
 778 static struct notifier_block ppc_fadump_block = {
 779         .notifier_call = ppc_panic_fadump_handler,
 780         .priority = INT_MAX, /* run early, to notify the firmware ASAP */
 781 };
 782
 783 static struct notifier_block kernel_offset_notifier = {
 784         .notifier_call = dump_kernel_offset,
 785 };
 786
 787 static struct notifier_block ppc_panic_block = {
 788         .notifier_call = ppc_panic_platform_handler,
 789         .priority = INT_MIN, /* may not return; must be done last */
 790 };
 791
 792 void __init setup_panic(void)
 793 {
 794         /* Hard-disables IRQs + deal with FW-assisted dump (fadump) */
 795         atomic_notifier_chain_register(&panic_notifier_list,
 796                                        &ppc_fadump_block);
 797
 798         if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
 799                 atomic_notifier_chain_register(&panic_notifier_list,
 800                                                &kernel_offset_notifier);
 801
 802         /* Low-level platform-specific routines that should run on panic */
 803         if (ppc_md.panic)
 804                 atomic_notifier_chain_register(&panic_notifier_list,
 805                                                &ppc_panic_block);
 806 }
 807
 808 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 809 /*
 810  * For platforms that have configurable cache-coherency.  This function
 811  * checks that the cache coherency setting of the kernel matches the setting
 812  * left by the firmware, as indicated in the device tree.  Since a mismatch
 813  * will eventually result in DMA failures, we print * and error and call
 814  * BUG() in that case.
 815  */
 816
 817 #define KERNEL_COHERENCY        (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
 818
 819 static int __init check_cache_coherency(void)
 820 {
 821         struct device_node *np;
 822         const void *prop;
 823         bool devtree_coherency;
 824
 825         np = of_find_node_by_path("/");
 826         prop = of_get_property(np, "coherency-off", NULL);
 827         of_node_put(np);
 828
 829         devtree_coherency = prop ? false : true;
 830
 831         if (devtree_coherency != KERNEL_COHERENCY) {
 832                 printk(KERN_ERR
 833                         "kernel coherency:%s != device tree_coherency:%s\n",
 834                         str_on_off(KERNEL_COHERENCY),
 835                         str_on_off(devtree_coherency));
 836                 BUG();
 837         }
 838
 839         return 0;
 840 }
 841
 842 late_initcall(check_cache_coherency);
 843 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 844
 845 void ppc_printk_progress(char *s, unsigned short hex)
 846 {
 847         pr_info("%s\n", s);
 848 }
 849
 850 static __init void print_system_info(void)
 851 {
 852         pr_info("-----------------------------------------------------\n");
 853         pr_info("phys_mem_size     = 0x%llx\n",
 854                 (unsigned long long)memblock_phys_mem_size());
 855
 856         pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 857         pr_info("icache_bsize      = 0x%x\n", icache_bsize);
 858
 859         pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 860         pr_info("  possible        = 0x%016lx\n",
 861                 (unsigned long)CPU_FTRS_POSSIBLE);
 862         pr_info("  always          = 0x%016lx\n",
 863                 (unsigned long)CPU_FTRS_ALWAYS);
 864         pr_info("cpu_user_features = 0x%08x 0x%08x\n",
 865                 cur_cpu_spec->cpu_user_features,
 866                 cur_cpu_spec->cpu_user_features2);
 867         pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
 868 #ifdef CONFIG_PPC64
 869         pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 870 #ifdef CONFIG_PPC_BOOK3S
 871         pr_info("vmalloc start     = 0x%lx\n", KERN_VIRT_START);
 872         pr_info("IO start          = 0x%lx\n", KERN_IO_START);
 873         pr_info("vmemmap start     = 0x%lx\n", (unsigned long)vmemmap);
 874 #endif
 875 #endif
 876
 877         if (!early_radix_enabled())
 878                 print_system_hash_info();
 879
 880         if (PHYSICAL_START > 0)
 881                 pr_info("physical_start    = 0x%llx\n",
 882                        (unsigned long long)PHYSICAL_START);
 883         pr_info("-----------------------------------------------------\n");
 884 }
 885
 886 #ifdef CONFIG_SMP
 887 static void __init smp_setup_pacas(void)
 888 {
 889         int cpu;
 890
 891         for_each_possible_cpu(cpu) {
 892                 if (cpu == smp_processor_id())
 893                         continue;
 894                 allocate_paca(cpu);
 895                 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
 896         }
 897
 898         memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32));
 899         cpu_to_phys_id = NULL;
 900 }
 901 #endif
 902
 903 /*
 904  * Called into from start_kernel this initializes memblock, which is used
 905  * to manage page allocation until mem_init is called.
 906  */
 907 void __init setup_arch(char **cmdline_p)
 908 {
 909         kasan_init();
 910
 911         *cmdline_p = boot_command_line;
 912
 913         /* Set a half-reasonable default so udelay does something sensible */
 914         loops_per_jiffy = 500000000 / HZ;
 915
 916         /* Unflatten the device-tree passed by prom_init or kexec */
 917         unflatten_device_tree();
 918
 919         /*
 920          * Initialize cache line/block info from device-tree (on ppc64) or
 921          * just cputable (on ppc32).
 922          */
 923         initialize_cache_info();
 924
 925         /* Initialize RTAS if available. */
 926         rtas_initialize();
 927
 928         /* Check if we have an initrd provided via the device-tree. */
 929         check_for_initrd();
 930
 931         /* Probe the machine type, establish ppc_md. */
 932         probe_machine();
 933
 934         /* Setup panic notifier if requested by the platform. */
 935         setup_panic();
 936
 937         /*
 938          * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
 939          * it from their respective probe() function.
 940          */
 941         setup_power_save();
 942
 943         /* Discover standard serial ports. */
 944         find_legacy_serial_ports();
 945
 946         /* Register early console with the printk subsystem. */
 947         register_early_udbg_console();
 948
 949         /* Setup the various CPU maps based on the device-tree. */
 950         smp_setup_cpu_maps();
 951
 952         /* Initialize xmon. */
 953         xmon_setup();
 954
 955         /* Check the SMT related command line arguments (ppc64). */
 956         check_smt_enabled();
 957
 958         /* Parse memory topology */
 959         mem_topology_setup();
 960         high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
 961
 962         /*
 963          * Release secondary cpus out of their spinloops at 0x60 now that
 964          * we can map physical -> logical CPU ids.
 965          *
 966          * Freescale Book3e parts spin in a loop provided by firmware,
 967          * so smp_release_cpus() does nothing for them.
 968          */
 969 #ifdef CONFIG_SMP
 970         smp_setup_pacas();
 971
 972         /* On BookE, setup per-core TLB data structures. */
 973         setup_tlb_core_data();
 974 #endif
 975
 976         /* Print various info about the machine that has been gathered so far. */
 977         print_system_info();
 978
 979         klp_init_thread_info(&init_task);
 980
 981         setup_initial_init_mm(_stext, _etext, _edata, _end);
 982         /* sched_init() does the mmgrab(&init_mm) for the primary CPU */
 983         VM_WARN_ON(cpumask_test_cpu(smp_processor_id(), mm_cpumask(&init_mm)));
 984         cpumask_set_cpu(smp_processor_id(), mm_cpumask(&init_mm));
 985         inc_mm_active_cpus(&init_mm);
 986         mm_iommu_init(&init_mm);
 987
 988         irqstack_early_init();
 989         exc_lvl_early_init();
 990         emergency_stack_init();
 991
 992         mce_init();
 993         smp_release_cpus();
 994
 995         initmem_init();
 996
 997         /*
 998          * Reserve large chunks of memory for use by CMA for fadump, KVM and
 999          * hugetlb. These must be called after initmem_init(), so that
1000          * pageblock_order is initialised.
1001          */
1002         fadump_cma_init();
1003         kvm_cma_reserve();
1004         gigantic_hugetlb_cma_reserve();
1005
1006         early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
1007
1008         if (ppc_md.setup_arch)
1009                 ppc_md.setup_arch();
1010
1011         setup_barrier_nospec();
1012         setup_spectre_v2();
1013
1014         paging_init();
1015
1016         /* Initialize the MMU context management stuff. */
1017         mmu_context_init();
1018
1019         /* Interrupt code needs to be 64K-aligned. */
1020         if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
1021                 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
1022                       (unsigned long)_stext);
1023 }