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 <linux/pgtable.h>
  35 #include <asm/debugfs.h>
  36 #include <asm/io.h>
  37 #include <asm/paca.h>
  38 #include <asm/prom.h>
  39 #include <asm/processor.h>
  40 #include <asm/vdso_datapage.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
  94 unsigned long klimit = (unsigned long) _end;
  95
  96 /*
  97  * This still seems to be needed... -- paulus
  98  */
  99 struct screen_info screen_info = {
 100         .orig_x = 0,
 101         .orig_y = 25,
 102         .orig_video_cols = 80,
 103         .orig_video_lines = 25,
 104         .orig_video_isVGA = 1,
 105         .orig_video_points = 16
 106 };
 107 #if defined(CONFIG_FB_VGA16_MODULE)
 108 EXPORT_SYMBOL(screen_info);
 109 #endif
 110
 111 /* Variables required to store legacy IO irq routing */
 112 int of_i8042_kbd_irq;
 113 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 114 int of_i8042_aux_irq;
 115 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 116
 117 #ifdef __DO_IRQ_CANON
 118 /* XXX should go elsewhere eventually */
 119 int ppc_do_canonicalize_irqs;
 120 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 121 #endif
 122
 123 #ifdef CONFIG_CRASH_CORE
 124 /* This keeps a track of which one is the crashing cpu. */
 125 int crashing_cpu = -1;
 126 #endif
 127
 128 /* also used by kexec */
 129 void machine_shutdown(void)
 130 {
 131         /*
 132          * if fadump is active, cleanup the fadump registration before we
 133          * shutdown.
 134          */
 135         fadump_cleanup();
 136
 137         if (ppc_md.machine_shutdown)
 138                 ppc_md.machine_shutdown();
 139 }
 140
 141 static void machine_hang(void)
 142 {
 143         pr_emerg("System Halted, OK to turn off power\n");
 144         local_irq_disable();
 145         while (1)
 146                 ;
 147 }
 148
 149 void machine_restart(char *cmd)
 150 {
 151         machine_shutdown();
 152         if (ppc_md.restart)
 153                 ppc_md.restart(cmd);
 154
 155         smp_send_stop();
 156
 157         do_kernel_restart(cmd);
 158         mdelay(1000);
 159
 160         machine_hang();
 161 }
 162
 163 void machine_power_off(void)
 164 {
 165         machine_shutdown();
 166         if (pm_power_off)
 167                 pm_power_off();
 168
 169         smp_send_stop();
 170         machine_hang();
 171 }
 172 /* Used by the G5 thermal driver */
 173 EXPORT_SYMBOL_GPL(machine_power_off);
 174
 175 void (*pm_power_off)(void);
 176 EXPORT_SYMBOL_GPL(pm_power_off);
 177
 178 void machine_halt(void)
 179 {
 180         machine_shutdown();
 181         if (ppc_md.halt)
 182                 ppc_md.halt();
 183
 184         smp_send_stop();
 185         machine_hang();
 186 }
 187
 188 #ifdef CONFIG_SMP
 189 DEFINE_PER_CPU(unsigned int, cpu_pvr);
 190 #endif
 191
 192 static void show_cpuinfo_summary(struct seq_file *m)
 193 {
 194         struct device_node *root;
 195         const char *model = NULL;
 196         unsigned long bogosum = 0;
 197         int i;
 198
 199         if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
 200                 for_each_online_cpu(i)
 201                         bogosum += loops_per_jiffy;
 202                 seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 203                            bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
 204         }
 205         seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 206         if (ppc_md.name)
 207                 seq_printf(m, "platform\t: %s\n", ppc_md.name);
 208         root = of_find_node_by_path("/");
 209         if (root)
 210                 model = of_get_property(root, "model", NULL);
 211         if (model)
 212                 seq_printf(m, "model\t\t: %s\n", model);
 213         of_node_put(root);
 214
 215         if (ppc_md.show_cpuinfo != NULL)
 216                 ppc_md.show_cpuinfo(m);
 217
 218         /* Display the amount of memory */
 219         if (IS_ENABLED(CONFIG_PPC32))
 220                 seq_printf(m, "Memory\t\t: %d MB\n",
 221                            (unsigned int)(total_memory / (1024 * 1024)));
 222 }
 223
 224 static int show_cpuinfo(struct seq_file *m, void *v)
 225 {
 226         unsigned long cpu_id = (unsigned long)v - 1;
 227         unsigned int pvr;
 228         unsigned long proc_freq;
 229         unsigned short maj;
 230         unsigned short min;
 231
 232 #ifdef CONFIG_SMP
 233         pvr = per_cpu(cpu_pvr, cpu_id);
 234 #else
 235         pvr = mfspr(SPRN_PVR);
 236 #endif
 237         maj = (pvr >> 8) & 0xFF;
 238         min = pvr & 0xFF;
 239
 240         seq_printf(m, "processor\t: %lu\n", cpu_id);
 241         seq_printf(m, "cpu\t\t: ");
 242
 243         if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
 244                 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
 245         else
 246                 seq_printf(m, "unknown (%08x)", pvr);
 247
 248         if (cpu_has_feature(CPU_FTR_ALTIVEC))
 249                 seq_printf(m, ", altivec supported");
 250
 251         seq_printf(m, "\n");
 252
 253 #ifdef CONFIG_TAU
 254         if (cpu_has_feature(CPU_FTR_TAU)) {
 255                 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
 256                         /* more straightforward, but potentially misleading */
 257                         seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 258                                    cpu_temp(cpu_id));
 259                 } else {
 260                         /* show the actual temp sensor range */
 261                         u32 temp;
 262                         temp = cpu_temp_both(cpu_id);
 263                         seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 264                                    temp & 0xff, temp >> 16);
 265                 }
 266         }
 267 #endif /* CONFIG_TAU */
 268
 269         /*
 270          * Platforms that have variable clock rates, should implement
 271          * the method ppc_md.get_proc_freq() that reports the clock
 272          * rate of a given cpu. The rest can use ppc_proc_freq to
 273          * report the clock rate that is same across all cpus.
 274          */
 275         if (ppc_md.get_proc_freq)
 276                 proc_freq = ppc_md.get_proc_freq(cpu_id);
 277         else
 278                 proc_freq = ppc_proc_freq;
 279
 280         if (proc_freq)
 281                 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 282                            proc_freq / 1000000, proc_freq % 1000000);
 283
 284         if (ppc_md.show_percpuinfo != NULL)
 285                 ppc_md.show_percpuinfo(m, cpu_id);
 286
 287         /* If we are a Freescale core do a simple check so
 288          * we dont have to keep adding cases in the future */
 289         if (PVR_VER(pvr) & 0x8000) {
 290                 switch (PVR_VER(pvr)) {
 291                 case 0x8000:    /* 7441/7450/7451, Voyager */
 292                 case 0x8001:    /* 7445/7455, Apollo 6 */
 293                 case 0x8002:    /* 7447/7457, Apollo 7 */
 294                 case 0x8003:    /* 7447A, Apollo 7 PM */
 295                 case 0x8004:    /* 7448, Apollo 8 */
 296                 case 0x800c:    /* 7410, Nitro */
 297                         maj = ((pvr >> 8) & 0xF);
 298                         min = PVR_MIN(pvr);
 299                         break;
 300                 default:        /* e500/book-e */
 301                         maj = PVR_MAJ(pvr);
 302                         min = PVR_MIN(pvr);
 303                         break;
 304                 }
 305         } else {
 306                 switch (PVR_VER(pvr)) {
 307                         case 0x1008:    /* 740P/750P ?? */
 308                                 maj = ((pvr >> 8) & 0xFF) - 1;
 309                                 min = pvr & 0xFF;
 310                                 break;
 311                         case 0x004e: /* POWER9 bits 12-15 give chip type */
 312                         case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
 313                                 maj = (pvr >> 8) & 0x0F;
 314                                 min = pvr & 0xFF;
 315                                 break;
 316                         default:
 317                                 maj = (pvr >> 8) & 0xFF;
 318                                 min = pvr & 0xFF;
 319                                 break;
 320                 }
 321         }
 322
 323         seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 324                    maj, min, PVR_VER(pvr), PVR_REV(pvr));
 325
 326         if (IS_ENABLED(CONFIG_PPC32))
 327                 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
 328                            (loops_per_jiffy / (5000 / HZ)) % 100);
 329
 330         seq_printf(m, "\n");
 331
 332         /* If this is the last cpu, print the summary */
 333         if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 334                 show_cpuinfo_summary(m);
 335
 336         return 0;
 337 }
 338
 339 static void *c_start(struct seq_file *m, loff_t *pos)
 340 {
 341         if (*pos == 0)  /* just in case, cpu 0 is not the first */
 342                 *pos = cpumask_first(cpu_online_mask);
 343         else
 344                 *pos = cpumask_next(*pos - 1, cpu_online_mask);
 345         if ((*pos) < nr_cpu_ids)
 346                 return (void *)(unsigned long)(*pos + 1);
 347         return NULL;
 348 }
 349
 350 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 351 {
 352         (*pos)++;
 353         return c_start(m, pos);
 354 }
 355
 356 static void c_stop(struct seq_file *m, void *v)
 357 {
 358 }
 359
 360 const struct seq_operations cpuinfo_op = {
 361         .start  = c_start,
 362         .next   = c_next,
 363         .stop   = c_stop,
 364         .show   = show_cpuinfo,
 365 };
 366
 367 void __init check_for_initrd(void)
 368 {
 369 #ifdef CONFIG_BLK_DEV_INITRD
 370         DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 371             initrd_start, initrd_end);
 372
 373         /* If we were passed an initrd, set the ROOT_DEV properly if the values
 374          * look sensible. If not, clear initrd reference.
 375          */
 376         if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 377             initrd_end > initrd_start)
 378                 ROOT_DEV = Root_RAM0;
 379         else
 380                 initrd_start = initrd_end = 0;
 381
 382         if (initrd_start)
 383                 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 384
 385         DBG(" <- check_for_initrd()\n");
 386 #endif /* CONFIG_BLK_DEV_INITRD */
 387 }
 388
 389 #ifdef CONFIG_SMP
 390
 391 int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
 392 cpumask_t threads_core_mask __read_mostly;
 393 EXPORT_SYMBOL_GPL(threads_per_core);
 394 EXPORT_SYMBOL_GPL(threads_per_subcore);
 395 EXPORT_SYMBOL_GPL(threads_shift);
 396 EXPORT_SYMBOL_GPL(threads_core_mask);
 397
 398 static void __init cpu_init_thread_core_maps(int tpc)
 399 {
 400         int i;
 401
 402         threads_per_core = tpc;
 403         threads_per_subcore = tpc;
 404         cpumask_clear(&threads_core_mask);
 405
 406         /* This implementation only supports power of 2 number of threads
 407          * for simplicity and performance
 408          */
 409         threads_shift = ilog2(tpc);
 410         BUG_ON(tpc != (1 << threads_shift));
 411
 412         for (i = 0; i < tpc; i++)
 413                 cpumask_set_cpu(i, &threads_core_mask);
 414
 415         printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 416                tpc, tpc > 1 ? "s" : "");
 417         printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 418 }
 419
 420
 421 u32 *cpu_to_phys_id = NULL;
 422
 423 /**
 424  * setup_cpu_maps - initialize the following cpu maps:
 425  *                  cpu_possible_mask
 426  *                  cpu_present_mask
 427  *
 428  * Having the possible map set up early allows us to restrict allocations
 429  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 430  *
 431  * We do not initialize the online map here; cpus set their own bits in
 432  * cpu_online_mask as they come up.
 433  *
 434  * This function is valid only for Open Firmware systems.  finish_device_tree
 435  * must be called before using this.
 436  *
 437  * While we're here, we may as well set the "physical" cpu ids in the paca.
 438  *
 439  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 440  */
 441 void __init smp_setup_cpu_maps(void)
 442 {
 443         struct device_node *dn;
 444         int cpu = 0;
 445         int nthreads = 1;
 446
 447         DBG("smp_setup_cpu_maps()\n");
 448
 449         cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
 450                                         __alignof__(u32));
 451         if (!cpu_to_phys_id)
 452                 panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
 453                       __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
 454
 455         for_each_node_by_type(dn, "cpu") {
 456                 const __be32 *intserv;
 457                 __be32 cpu_be;
 458                 int j, len;
 459
 460                 DBG("  * %pOF...\n", dn);
 461
 462                 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 463                                 &len);
 464                 if (intserv) {
 465                         DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
 466                             nthreads);
 467                 } else {
 468                         DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 469                         intserv = of_get_property(dn, "reg", &len);
 470                         if (!intserv) {
 471                                 cpu_be = cpu_to_be32(cpu);
 472                                 /* XXX: what is this? uninitialized?? */
 473                                 intserv = &cpu_be;      /* assume logical == phys */
 474                                 len = 4;
 475                         }
 476                 }
 477
 478                 nthreads = len / sizeof(int);
 479
 480                 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
 481                         bool avail;
 482
 483                         DBG("    thread %d -> cpu %d (hard id %d)\n",
 484                             j, cpu, be32_to_cpu(intserv[j]));
 485
 486                         avail = of_device_is_available(dn);
 487                         if (!avail)
 488                                 avail = !of_property_match_string(dn,
 489                                                 "enable-method", "spin-table");
 490
 491                         set_cpu_present(cpu, avail);
 492                         set_cpu_possible(cpu, true);
 493                         cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
 494                         cpu++;
 495                 }
 496
 497                 if (cpu >= nr_cpu_ids) {
 498                         of_node_put(dn);
 499                         break;
 500                 }
 501         }
 502
 503         /* If no SMT supported, nthreads is forced to 1 */
 504         if (!cpu_has_feature(CPU_FTR_SMT)) {
 505                 DBG("  SMT disabled ! nthreads forced to 1\n");
 506                 nthreads = 1;
 507         }
 508
 509 #ifdef CONFIG_PPC64
 510         /*
 511          * On pSeries LPAR, we need to know how many cpus
 512          * could possibly be added to this partition.
 513          */
 514         if (firmware_has_feature(FW_FEATURE_LPAR) &&
 515             (dn = of_find_node_by_path("/rtas"))) {
 516                 int num_addr_cell, num_size_cell, maxcpus;
 517                 const __be32 *ireg;
 518
 519                 num_addr_cell = of_n_addr_cells(dn);
 520                 num_size_cell = of_n_size_cells(dn);
 521
 522                 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 523
 524                 if (!ireg)
 525                         goto out;
 526
 527                 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 528
 529                 /* Double maxcpus for processors which have SMT capability */
 530                 if (cpu_has_feature(CPU_FTR_SMT))
 531                         maxcpus *= nthreads;
 532
 533                 if (maxcpus > nr_cpu_ids) {
 534                         printk(KERN_WARNING
 535                                "Partition configured for %d cpus, "
 536                                "operating system maximum is %u.\n",
 537                                maxcpus, nr_cpu_ids);
 538                         maxcpus = nr_cpu_ids;
 539                 } else
 540                         printk(KERN_INFO "Partition configured for %d cpus.\n",
 541                                maxcpus);
 542
 543                 for (cpu = 0; cpu < maxcpus; cpu++)
 544                         set_cpu_possible(cpu, true);
 545         out:
 546                 of_node_put(dn);
 547         }
 548         vdso_data->processorCount = num_present_cpus();
 549 #endif /* CONFIG_PPC64 */
 550
 551         /* Initialize CPU <=> thread mapping/
 552          *
 553          * WARNING: We assume that the number of threads is the same for
 554          * every CPU in the system. If that is not the case, then some code
 555          * here will have to be reworked
 556          */
 557         cpu_init_thread_core_maps(nthreads);
 558
 559         /* Now that possible cpus are set, set nr_cpu_ids for later use */
 560         setup_nr_cpu_ids();
 561
 562         free_unused_pacas();
 563 }
 564 #endif /* CONFIG_SMP */
 565
 566 #ifdef CONFIG_PCSPKR_PLATFORM
 567 static __init int add_pcspkr(void)
 568 {
 569         struct device_node *np;
 570         struct platform_device *pd;
 571         int ret;
 572
 573         np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 574         of_node_put(np);
 575         if (!np)
 576                 return -ENODEV;
 577
 578         pd = platform_device_alloc("pcspkr", -1);
 579         if (!pd)
 580                 return -ENOMEM;
 581
 582         ret = platform_device_add(pd);
 583         if (ret)
 584                 platform_device_put(pd);
 585
 586         return ret;
 587 }
 588 device_initcall(add_pcspkr);
 589 #endif  /* CONFIG_PCSPKR_PLATFORM */
 590
 591 void probe_machine(void)
 592 {
 593         extern struct machdep_calls __machine_desc_start;
 594         extern struct machdep_calls __machine_desc_end;
 595         unsigned int i;
 596
 597         /*
 598          * Iterate all ppc_md structures until we find the proper
 599          * one for the current machine type
 600          */
 601         DBG("Probing machine type ...\n");
 602
 603         /*
 604          * Check ppc_md is empty, if not we have a bug, ie, we setup an
 605          * entry before probe_machine() which will be overwritten
 606          */
 607         for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
 608                 if (((void **)&ppc_md)[i]) {
 609                         printk(KERN_ERR "Entry %d in ppc_md non empty before"
 610                                " machine probe !\n", i);
 611                 }
 612         }
 613
 614         for (machine_id = &__machine_desc_start;
 615              machine_id < &__machine_desc_end;
 616              machine_id++) {
 617                 DBG("  %s ...", machine_id->name);
 618                 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 619                 if (ppc_md.probe()) {
 620                         DBG(" match !\n");
 621                         break;
 622                 }
 623                 DBG("\n");
 624         }
 625         /* What can we do if we didn't find ? */
 626         if (machine_id >= &__machine_desc_end) {
 627                 pr_err("No suitable machine description found !\n");
 628                 for (;;);
 629         }
 630
 631         printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
 632 }
 633
 634 /* Match a class of boards, not a specific device configuration. */
 635 int check_legacy_ioport(unsigned long base_port)
 636 {
 637         struct device_node *parent, *np = NULL;
 638         int ret = -ENODEV;
 639
 640         switch(base_port) {
 641         case I8042_DATA_REG:
 642                 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 643                         np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 644                 if (np) {
 645                         parent = of_get_parent(np);
 646
 647                         of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 648                         if (!of_i8042_kbd_irq)
 649                                 of_i8042_kbd_irq = 1;
 650
 651                         of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 652                         if (!of_i8042_aux_irq)
 653                                 of_i8042_aux_irq = 12;
 654
 655                         of_node_put(np);
 656                         np = parent;
 657                         break;
 658                 }
 659                 np = of_find_node_by_type(NULL, "8042");
 660                 /* Pegasos has no device_type on its 8042 node, look for the
 661                  * name instead */
 662                 if (!np)
 663                         np = of_find_node_by_name(NULL, "8042");
 664                 if (np) {
 665                         of_i8042_kbd_irq = 1;
 666                         of_i8042_aux_irq = 12;
 667                 }
 668                 break;
 669         case FDC_BASE: /* FDC1 */
 670                 np = of_find_node_by_type(NULL, "fdc");
 671                 break;
 672         default:
 673                 /* ipmi is supposed to fail here */
 674                 break;
 675         }
 676         if (!np)
 677                 return ret;
 678         parent = of_get_parent(np);
 679         if (parent) {
 680                 if (of_node_is_type(parent, "isa"))
 681                         ret = 0;
 682                 of_node_put(parent);
 683         }
 684         of_node_put(np);
 685         return ret;
 686 }
 687 EXPORT_SYMBOL(check_legacy_ioport);
 688
 689 static int ppc_panic_event(struct notifier_block *this,
 690                              unsigned long event, void *ptr)
 691 {
 692         /*
 693          * panic does a local_irq_disable, but we really
 694          * want interrupts to be hard disabled.
 695          */
 696         hard_irq_disable();
 697
 698         /*
 699          * If firmware-assisted dump has been registered then trigger
 700          * firmware-assisted dump and let firmware handle everything else.
 701          */
 702         crash_fadump(NULL, ptr);
 703         if (ppc_md.panic)
 704                 ppc_md.panic(ptr);  /* May not return */
 705         return NOTIFY_DONE;
 706 }
 707
 708 static struct notifier_block ppc_panic_block = {
 709         .notifier_call = ppc_panic_event,
 710         .priority = INT_MIN /* may not return; must be done last */
 711 };
 712
 713 /*
 714  * Dump out kernel offset information on panic.
 715  */
 716 static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
 717                               void *p)
 718 {
 719         pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
 720                  kaslr_offset(), KERNELBASE);
 721
 722         return 0;
 723 }
 724
 725 static struct notifier_block kernel_offset_notifier = {
 726         .notifier_call = dump_kernel_offset
 727 };
 728
 729 void __init setup_panic(void)
 730 {
 731         if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
 732                 atomic_notifier_chain_register(&panic_notifier_list,
 733                                                &kernel_offset_notifier);
 734
 735         /* PPC64 always does a hard irq disable in its panic handler */
 736         if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
 737                 return;
 738         atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
 739 }
 740
 741 #ifdef CONFIG_CHECK_CACHE_COHERENCY
 742 /*
 743  * For platforms that have configurable cache-coherency.  This function
 744  * checks that the cache coherency setting of the kernel matches the setting
 745  * left by the firmware, as indicated in the device tree.  Since a mismatch
 746  * will eventually result in DMA failures, we print * and error and call
 747  * BUG() in that case.
 748  */
 749
 750 #define KERNEL_COHERENCY        (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
 751
 752 static int __init check_cache_coherency(void)
 753 {
 754         struct device_node *np;
 755         const void *prop;
 756         bool devtree_coherency;
 757
 758         np = of_find_node_by_path("/");
 759         prop = of_get_property(np, "coherency-off", NULL);
 760         of_node_put(np);
 761
 762         devtree_coherency = prop ? false : true;
 763
 764         if (devtree_coherency != KERNEL_COHERENCY) {
 765                 printk(KERN_ERR
 766                         "kernel coherency:%s != device tree_coherency:%s\n",
 767                         KERNEL_COHERENCY ? "on" : "off",
 768                         devtree_coherency ? "on" : "off");
 769                 BUG();
 770         }
 771
 772         return 0;
 773 }
 774
 775 late_initcall(check_cache_coherency);
 776 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
 777
 778 #ifdef CONFIG_DEBUG_FS
 779 struct dentry *powerpc_debugfs_root;
 780 EXPORT_SYMBOL(powerpc_debugfs_root);
 781
 782 static int powerpc_debugfs_init(void)
 783 {
 784         powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 785         return 0;
 786 }
 787 arch_initcall(powerpc_debugfs_init);
 788 #endif
 789
 790 void ppc_printk_progress(char *s, unsigned short hex)
 791 {
 792         pr_info("%s\n", s);
 793 }
 794
 795 static __init void print_system_info(void)
 796 {
 797         pr_info("-----------------------------------------------------\n");
 798         pr_info("phys_mem_size     = 0x%llx\n",
 799                 (unsigned long long)memblock_phys_mem_size());
 800
 801         pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 802         pr_info("icache_bsize      = 0x%x\n", icache_bsize);
 803
 804         pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 805         pr_info("  possible        = 0x%016lx\n",
 806                 (unsigned long)CPU_FTRS_POSSIBLE);
 807         pr_info("  always          = 0x%016lx\n",
 808                 (unsigned long)CPU_FTRS_ALWAYS);
 809         pr_info("cpu_user_features = 0x%08x 0x%08x\n",
 810                 cur_cpu_spec->cpu_user_features,
 811                 cur_cpu_spec->cpu_user_features2);
 812         pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
 813 #ifdef CONFIG_PPC64
 814         pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 815 #ifdef CONFIG_PPC_BOOK3S
 816         pr_info("vmalloc start     = 0x%lx\n", KERN_VIRT_START);
 817         pr_info("IO start          = 0x%lx\n", KERN_IO_START);
 818         pr_info("vmemmap start     = 0x%lx\n", (unsigned long)vmemmap);
 819 #endif
 820 #endif
 821
 822         if (!early_radix_enabled())
 823                 print_system_hash_info();
 824
 825         if (PHYSICAL_START > 0)
 826                 pr_info("physical_start    = 0x%llx\n",
 827                        (unsigned long long)PHYSICAL_START);
 828         pr_info("-----------------------------------------------------\n");
 829 }
 830
 831 #ifdef CONFIG_SMP
 832 static void smp_setup_pacas(void)
 833 {
 834         int cpu;
 835
 836         for_each_possible_cpu(cpu) {
 837                 if (cpu == smp_processor_id())
 838                         continue;
 839                 allocate_paca(cpu);
 840                 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
 841         }
 842
 843         memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
 844         cpu_to_phys_id = NULL;
 845 }
 846 #endif
 847
 848 /*
 849  * Called into from start_kernel this initializes memblock, which is used
 850  * to manage page allocation until mem_init is called.
 851  */
 852 void __init setup_arch(char **cmdline_p)
 853 {
 854         kasan_init();
 855
 856         *cmdline_p = boot_command_line;
 857
 858         /* Set a half-reasonable default so udelay does something sensible */
 859         loops_per_jiffy = 500000000 / HZ;
 860
 861         /* Unflatten the device-tree passed by prom_init or kexec */
 862         unflatten_device_tree();
 863
 864         /*
 865          * Initialize cache line/block info from device-tree (on ppc64) or
 866          * just cputable (on ppc32).
 867          */
 868         initialize_cache_info();
 869
 870         /* Initialize RTAS if available. */
 871         rtas_initialize();
 872
 873         /* Check if we have an initrd provided via the device-tree. */
 874         check_for_initrd();
 875
 876         /* Probe the machine type, establish ppc_md. */
 877         probe_machine();
 878
 879         /* Setup panic notifier if requested by the platform. */
 880         setup_panic();
 881
 882         /*
 883          * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
 884          * it from their respective probe() function.
 885          */
 886         setup_power_save();
 887
 888         /* Discover standard serial ports. */
 889         find_legacy_serial_ports();
 890
 891         /* Register early console with the printk subsystem. */
 892         register_early_udbg_console();
 893
 894         /* Setup the various CPU maps based on the device-tree. */
 895         smp_setup_cpu_maps();
 896
 897         /* Initialize xmon. */
 898         xmon_setup();
 899
 900         /* Check the SMT related command line arguments (ppc64). */
 901         check_smt_enabled();
 902
 903         /* Parse memory topology */
 904         mem_topology_setup();
 905
 906         /*
 907          * Release secondary cpus out of their spinloops at 0x60 now that
 908          * we can map physical -> logical CPU ids.
 909          *
 910          * Freescale Book3e parts spin in a loop provided by firmware,
 911          * so smp_release_cpus() does nothing for them.
 912          */
 913 #ifdef CONFIG_SMP
 914         smp_setup_pacas();
 915
 916         /* On BookE, setup per-core TLB data structures. */
 917         setup_tlb_core_data();
 918 #endif
 919
 920         /* Print various info about the machine that has been gathered so far. */
 921         print_system_info();
 922
 923         /* Reserve large chunks of memory for use by CMA for KVM. */
 924         kvm_cma_reserve();
 925
 926         /*  Reserve large chunks of memory for us by CMA for hugetlb */
 927         gigantic_hugetlb_cma_reserve();
 928
 929         klp_init_thread_info(&init_task);
 930
 931         init_mm.start_code = (unsigned long)_stext;
 932         init_mm.end_code = (unsigned long) _etext;
 933         init_mm.end_data = (unsigned long) _edata;
 934         init_mm.brk = klimit;
 935
 936         mm_iommu_init(&init_mm);
 937         irqstack_early_init();
 938         exc_lvl_early_init();
 939         emergency_stack_init();
 940
 941         smp_release_cpus();
 942
 943         initmem_init();
 944
 945         early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
 946
 947         if (ppc_md.setup_arch)
 948                 ppc_md.setup_arch();
 949
 950         setup_barrier_nospec();
 951         setup_spectre_v2();
 952
 953         paging_init();
 954
 955         /* Initialize the MMU context management stuff. */
 956         mmu_context_init();
 957
 958         /* Interrupt code needs to be 64K-aligned. */
 959         if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
 960                 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
 961                       (unsigned long)_stext);
 962 }