linux/arch/powerpc/kernel/setup-common.c
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   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 */
  79struct machdep_calls ppc_md;
  80EXPORT_SYMBOL(ppc_md);
  81struct machdep_calls *machine_id;
  82EXPORT_SYMBOL(machine_id);
  83
  84int boot_cpuid = -1;
  85EXPORT_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 */
  91int dcache_bsize;
  92int icache_bsize;
  93int ucache_bsize;
  94
  95
  96unsigned long klimit = (unsigned long) _end;
  97
  98/*
  99 * This still seems to be needed... -- paulus
 100 */ 
 101struct 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)
 110EXPORT_SYMBOL(screen_info);
 111#endif
 112
 113/* Variables required to store legacy IO irq routing */
 114int of_i8042_kbd_irq;
 115EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 116int of_i8042_aux_irq;
 117EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 118
 119#ifdef __DO_IRQ_CANON
 120/* XXX should go elsewhere eventually */
 121int ppc_do_canonicalize_irqs;
 122EXPORT_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. */
 127int crashing_cpu = -1;
 128#endif
 129
 130/* also used by kexec */
 131void 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
 143static 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
 151void 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
 165void 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 */
 175EXPORT_SYMBOL_GPL(machine_power_off);
 176
 177void (*pm_power_off)(void);
 178EXPORT_SYMBOL_GPL(pm_power_off);
 179
 180void 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
 191DEFINE_PER_CPU(unsigned int, cpu_pvr);
 192#endif
 193
 194static 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
 226static 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
 344static 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
 355static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 356{
 357        (*pos)++;
 358        return c_start(m, pos);
 359}
 360
 361static void c_stop(struct seq_file *m, void *v)
 362{
 363}
 364
 365const struct seq_operations cpuinfo_op = {
 366        .start  = c_start,
 367        .next   = c_next,
 368        .stop   = c_stop,
 369        .show   = show_cpuinfo,
 370};
 371
 372void __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
 396int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
 397cpumask_t threads_core_mask __read_mostly;
 398EXPORT_SYMBOL_GPL(threads_per_core);
 399EXPORT_SYMBOL_GPL(threads_per_subcore);
 400EXPORT_SYMBOL_GPL(threads_shift);
 401EXPORT_SYMBOL_GPL(threads_core_mask);
 402
 403static 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
 426u32 *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 */
 446void __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
 572static __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}
 593device_initcall(add_pcspkr);
 594#endif  /* CONFIG_PCSPKR_PLATFORM */
 595
 596void 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. */
 640int 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}
 692EXPORT_SYMBOL(check_legacy_ioport);
 693
 694static 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
 713static 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 */
 721static 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
 730static struct notifier_block kernel_offset_notifier = {
 731        .notifier_call = dump_kernel_offset
 732};
 733
 734void __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
 757static 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
 780late_initcall(check_cache_coherency);
 781#endif /* CONFIG_CHECK_CACHE_COHERENCY */
 782
 783#ifdef CONFIG_DEBUG_FS
 784struct dentry *powerpc_debugfs_root;
 785EXPORT_SYMBOL(powerpc_debugfs_root);
 786
 787static int powerpc_debugfs_init(void)
 788{
 789        powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
 790
 791        return powerpc_debugfs_root == NULL;
 792}
 793arch_initcall(powerpc_debugfs_init);
 794#endif
 795
 796void ppc_printk_progress(char *s, unsigned short hex)
 797{
 798        pr_info("%s\n", s);
 799}
 800
 801static __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
 840static 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 */
 860void __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}
 968