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/kexec.h>
  39#include <asm/io.h>
  40#include <asm/paca.h>
  41#include <asm/processor.h>
  42#include <asm/vdso_datapage.h>
  43#include <asm/smp.h>
  44#include <asm/elf.h>
  45#include <asm/machdep.h>
  46#include <asm/time.h>
  47#include <asm/cputable.h>
  48#include <asm/sections.h>
  49#include <asm/firmware.h>
  50#include <asm/btext.h>
  51#include <asm/nvram.h>
  52#include <asm/setup.h>
  53#include <asm/rtas.h>
  54#include <asm/iommu.h>
  55#include <asm/serial.h>
  56#include <asm/cache.h>
  57#include <asm/page.h>
  58#include <asm/mmu.h>
  59#include <asm/xmon.h>
  60#include <asm/cputhreads.h>
  61#include <mm/mmu_decl.h>
  62#include <asm/archrandom.h>
  63#include <asm/fadump.h>
  64#include <asm/udbg.h>
  65#include <asm/hugetlb.h>
  66#include <asm/livepatch.h>
  67#include <asm/mmu_context.h>
  68#include <asm/cpu_has_feature.h>
  69#include <asm/kasan.h>
  70#include <asm/mce.h>
  71#include <asm/systemcfg.h>
  72
  73#include "setup.h"
  74
  75#ifdef DEBUG
  76#define DBG(fmt...) udbg_printf(fmt)
  77#else
  78#define DBG(fmt...)
  79#endif
  80
  81/* The main machine-dep calls structure
  82 */
  83struct machdep_calls ppc_md;
  84EXPORT_SYMBOL(ppc_md);
  85struct machdep_calls *machine_id;
  86EXPORT_SYMBOL(machine_id);
  87
  88int boot_cpuid = -1;
  89EXPORT_SYMBOL_GPL(boot_cpuid);
  90int __initdata boot_core_hwid = -1;
  91
  92#ifdef CONFIG_PPC64
  93int boot_cpu_hwid = -1;
  94#endif
  95
  96/*
  97 * These are used in binfmt_elf.c to put aux entries on the stack
  98 * for each elf executable being started.
  99 */
 100int dcache_bsize;
 101int icache_bsize;
 102
 103/* Variables required to store legacy IO irq routing */
 104int of_i8042_kbd_irq;
 105EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
 106int of_i8042_aux_irq;
 107EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
 108
 109#ifdef __DO_IRQ_CANON
 110/* XXX should go elsewhere eventually */
 111int ppc_do_canonicalize_irqs;
 112EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
 113#endif
 114
 115#ifdef CONFIG_CRASH_DUMP
 116/* This keeps a track of which one is the crashing cpu. */
 117int crashing_cpu = -1;
 118#endif
 119
 120/* also used by kexec */
 121void machine_shutdown(void)
 122{
 123	/*
 124	 * if fadump is active, cleanup the fadump registration before we
 125	 * shutdown.
 126	 */
 127	fadump_cleanup();
 128
 129	if (ppc_md.machine_shutdown)
 130		ppc_md.machine_shutdown();
 131}
 132
 133static void machine_hang(void)
 134{
 135	pr_emerg("System Halted, OK to turn off power\n");
 136	local_irq_disable();
 137	while (1)
 138		;
 139}
 140
 141void machine_restart(char *cmd)
 142{
 143	machine_shutdown();
 144	if (ppc_md.restart)
 145		ppc_md.restart(cmd);
 146
 147	smp_send_stop();
 148
 149	do_kernel_restart(cmd);
 150	mdelay(1000);
 151
 152	machine_hang();
 153}
 154
 155void machine_power_off(void)
 156{
 157	machine_shutdown();
 158	do_kernel_power_off();
 159	smp_send_stop();
 160	machine_hang();
 161}
 162/* Used by the G5 thermal driver */
 163EXPORT_SYMBOL_GPL(machine_power_off);
 164
 165void (*pm_power_off)(void);
 166EXPORT_SYMBOL_GPL(pm_power_off);
 167
 168size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs)
 169{
 170	if (max_longs && ppc_md.get_random_seed && ppc_md.get_random_seed(v))
 171		return 1;
 172	return 0;
 173}
 174EXPORT_SYMBOL(arch_get_random_seed_longs);
 175
 176void machine_halt(void)
 177{
 178	machine_shutdown();
 179	if (ppc_md.halt)
 180		ppc_md.halt();
 181
 182	smp_send_stop();
 183	machine_hang();
 184}
 185
 186#ifdef CONFIG_SMP
 187DEFINE_PER_CPU(unsigned int, cpu_pvr);
 188#endif
 189
 190static void show_cpuinfo_summary(struct seq_file *m)
 191{
 192	struct device_node *root;
 193	const char *model = NULL;
 194	unsigned long bogosum = 0;
 195	int i;
 196
 197	if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
 198		for_each_online_cpu(i)
 199			bogosum += loops_per_jiffy;
 200		seq_printf(m, "total bogomips\t: %lu.%02lu\n",
 201			   bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
 202	}
 203	seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
 204	if (ppc_md.name)
 205		seq_printf(m, "platform\t: %s\n", ppc_md.name);
 206	root = of_find_node_by_path("/");
 207	if (root)
 208		model = of_get_property(root, "model", NULL);
 209	if (model)
 210		seq_printf(m, "model\t\t: %s\n", model);
 211	of_node_put(root);
 212
 213	if (ppc_md.show_cpuinfo != NULL)
 214		ppc_md.show_cpuinfo(m);
 215
 216	/* Display the amount of memory */
 217	if (IS_ENABLED(CONFIG_PPC32))
 218		seq_printf(m, "Memory\t\t: %d MB\n",
 219			   (unsigned int)(total_memory / (1024 * 1024)));
 220}
 221
 222static int show_cpuinfo(struct seq_file *m, void *v)
 223{
 224	unsigned long cpu_id = (unsigned long)v - 1;
 225	unsigned int pvr;
 226	unsigned long proc_freq;
 227	unsigned short maj;
 228	unsigned short min;
 229
 230#ifdef CONFIG_SMP
 231	pvr = per_cpu(cpu_pvr, cpu_id);
 232#else
 233	pvr = mfspr(SPRN_PVR);
 234#endif
 235	maj = (pvr >> 8) & 0xFF;
 236	min = pvr & 0xFF;
 237
 238	seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id);
 239
 240	if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
 241		seq_puts(m, cur_cpu_spec->cpu_name);
 242	else
 243		seq_printf(m, "unknown (%08x)", pvr);
 244
 245	if (cpu_has_feature(CPU_FTR_ALTIVEC))
 246		seq_puts(m, ", altivec supported");
 247
 248	seq_putc(m, '\n');
 249
 250#ifdef CONFIG_TAU
 251	if (cpu_has_feature(CPU_FTR_TAU)) {
 252		if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
 253			/* more straightforward, but potentially misleading */
 254			seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
 255				   cpu_temp(cpu_id));
 256		} else {
 257			/* show the actual temp sensor range */
 258			u32 temp;
 259			temp = cpu_temp_both(cpu_id);
 260			seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
 261				   temp & 0xff, temp >> 16);
 262		}
 263	}
 264#endif /* CONFIG_TAU */
 265
 266	/*
 267	 * Platforms that have variable clock rates, should implement
 268	 * the method ppc_md.get_proc_freq() that reports the clock
 269	 * rate of a given cpu. The rest can use ppc_proc_freq to
 270	 * report the clock rate that is same across all cpus.
 271	 */
 272	if (ppc_md.get_proc_freq)
 273		proc_freq = ppc_md.get_proc_freq(cpu_id);
 274	else
 275		proc_freq = ppc_proc_freq;
 276
 277	if (proc_freq)
 278		seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
 279			   proc_freq / 1000000, proc_freq % 1000000);
 280
 281	/* If we are a Freescale core do a simple check so
 282	 * we don't have to keep adding cases in the future */
 283	if (PVR_VER(pvr) & 0x8000) {
 284		switch (PVR_VER(pvr)) {
 285		case 0x8000:	/* 7441/7450/7451, Voyager */
 286		case 0x8001:	/* 7445/7455, Apollo 6 */
 287		case 0x8002:	/* 7447/7457, Apollo 7 */
 288		case 0x8003:	/* 7447A, Apollo 7 PM */
 289		case 0x8004:	/* 7448, Apollo 8 */
 290		case 0x800c:	/* 7410, Nitro */
 291			maj = ((pvr >> 8) & 0xF);
 292			min = PVR_MIN(pvr);
 293			break;
 294		default:	/* e500/book-e */
 295			maj = PVR_MAJ(pvr);
 296			min = PVR_MIN(pvr);
 297			break;
 298		}
 299	} else {
 300		switch (PVR_VER(pvr)) {
 301			case 0x1008:	/* 740P/750P ?? */
 302				maj = ((pvr >> 8) & 0xFF) - 1;
 303				min = pvr & 0xFF;
 304				break;
 305			case 0x004e: /* POWER9 bits 12-15 give chip type */
 306			case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
 307				maj = (pvr >> 8) & 0x0F;
 308				min = pvr & 0xFF;
 309				break;
 310			default:
 311				maj = (pvr >> 8) & 0xFF;
 312				min = pvr & 0xFF;
 313				break;
 314		}
 315	}
 316
 317	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
 318		   maj, min, PVR_VER(pvr), PVR_REV(pvr));
 319
 320	if (IS_ENABLED(CONFIG_PPC32))
 321		seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
 322			   (loops_per_jiffy / (5000 / HZ)) % 100);
 323
 324	seq_putc(m, '\n');
 325
 326	/* If this is the last cpu, print the summary */
 327	if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
 328		show_cpuinfo_summary(m);
 329
 330	return 0;
 331}
 332
 333static void *c_start(struct seq_file *m, loff_t *pos)
 334{
 335	if (*pos == 0)	/* just in case, cpu 0 is not the first */
 336		*pos = cpumask_first(cpu_online_mask);
 337	else
 338		*pos = cpumask_next(*pos - 1, cpu_online_mask);
 339	if ((*pos) < nr_cpu_ids)
 340		return (void *)(unsigned long)(*pos + 1);
 341	return NULL;
 342}
 343
 344static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 345{
 346	(*pos)++;
 347	return c_start(m, pos);
 348}
 349
 350static void c_stop(struct seq_file *m, void *v)
 351{
 352}
 353
 354const struct seq_operations cpuinfo_op = {
 355	.start	= c_start,
 356	.next	= c_next,
 357	.stop	= c_stop,
 358	.show	= show_cpuinfo,
 359};
 360
 361void __init check_for_initrd(void)
 362{
 363#ifdef CONFIG_BLK_DEV_INITRD
 364	DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
 365	    initrd_start, initrd_end);
 366
 367	/* If we were passed an initrd, set the ROOT_DEV properly if the values
 368	 * look sensible. If not, clear initrd reference.
 369	 */
 370	if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
 371	    initrd_end > initrd_start)
 372		ROOT_DEV = Root_RAM0;
 373	else
 374		initrd_start = initrd_end = 0;
 375
 376	if (initrd_start)
 377		pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
 378
 379	DBG(" <- check_for_initrd()\n");
 380#endif /* CONFIG_BLK_DEV_INITRD */
 381}
 382
 383#ifdef CONFIG_SMP
 384
 385int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
 386cpumask_t threads_core_mask __read_mostly;
 387EXPORT_SYMBOL_GPL(threads_per_core);
 388EXPORT_SYMBOL_GPL(threads_per_subcore);
 389EXPORT_SYMBOL_GPL(threads_shift);
 390EXPORT_SYMBOL_GPL(threads_core_mask);
 391
 392static void __init cpu_init_thread_core_maps(int tpc)
 393{
 394	int i;
 395
 396	threads_per_core = tpc;
 397	threads_per_subcore = tpc;
 398	cpumask_clear(&threads_core_mask);
 399
 400	/* This implementation only supports power of 2 number of threads
 401	 * for simplicity and performance
 402	 */
 403	threads_shift = ilog2(tpc);
 404	BUG_ON(tpc != (1 << threads_shift));
 405
 406	for (i = 0; i < tpc; i++)
 407		cpumask_set_cpu(i, &threads_core_mask);
 408
 409	printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
 410	       tpc, str_plural(tpc));
 411	printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
 412}
 413
 414
 415u32 *cpu_to_phys_id = NULL;
 416
 417static int assign_threads(unsigned int cpu, unsigned int nthreads, bool present,
 418			  const __be32 *hw_ids)
 419{
 420	for (int i = 0; i < nthreads && cpu < nr_cpu_ids; i++) {
 421		__be32 hwid;
 422
 423		hwid = be32_to_cpu(hw_ids[i]);
 424
 425		DBG("    thread %d -> cpu %d (hard id %d)\n", i, cpu, hwid);
 426
 427		set_cpu_present(cpu, present);
 428		set_cpu_possible(cpu, true);
 429		cpu_to_phys_id[cpu] = hwid;
 430		cpu++;
 431	}
 432
 433	return cpu;
 434}
 435
 436/**
 437 * setup_cpu_maps - initialize the following cpu maps:
 438 *                  cpu_possible_mask
 439 *                  cpu_present_mask
 440 *
 441 * Having the possible map set up early allows us to restrict allocations
 442 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
 443 *
 444 * We do not initialize the online map here; cpus set their own bits in
 445 * cpu_online_mask as they come up.
 446 *
 447 * This function is valid only for Open Firmware systems.  finish_device_tree
 448 * must be called before using this.
 449 *
 450 * While we're here, we may as well set the "physical" cpu ids in the paca.
 451 *
 452 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
 453 */
 454void __init smp_setup_cpu_maps(void)
 455{
 456	struct device_node *dn;
 457	int cpu = 0;
 458	int nthreads = 1;
 459
 460	DBG("smp_setup_cpu_maps()\n");
 461
 462	cpu_to_phys_id = memblock_alloc_or_panic(nr_cpu_ids * sizeof(u32),
 463					__alignof__(u32));
 464
 465	for_each_node_by_type(dn, "cpu") {
 466		const __be32 *intserv;
 467		__be32 cpu_be;
 468		int len;
 469
 470		DBG("  * %pOF...\n", dn);
 471
 472		intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
 473				&len);
 474		if (intserv) {
 475			DBG("    ibm,ppc-interrupt-server#s -> %lu threads\n",
 476			    (len / sizeof(int)));
 477		} else {
 478			DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
 479			intserv = of_get_property(dn, "reg", &len);
 480			if (!intserv) {
 481				cpu_be = cpu_to_be32(cpu);
 482				/* XXX: what is this? uninitialized?? */
 483				intserv = &cpu_be;	/* assume logical == phys */
 484				len = 4;
 485			}
 486		}
 487
 488		nthreads = len / sizeof(int);
 489
 490		bool avail = of_device_is_available(dn);
 491		if (!avail)
 492			avail = !of_property_match_string(dn,
 493					"enable-method", "spin-table");
 494
 495		if (boot_core_hwid >= 0) {
 496			if (cpu == 0) {
 497				pr_info("Skipping CPU node %pOF to allow for boot core.\n", dn);
 498				cpu = nthreads;
 499				continue;
 500			}
 501
 502			if (be32_to_cpu(intserv[0]) == boot_core_hwid) {
 503				pr_info("Renumbered boot core %pOF to logical 0\n", dn);
 504				assign_threads(0, nthreads, avail, intserv);
 505				of_node_put(dn);
 506				break;
 507			}
 508		} else if (cpu >= nr_cpu_ids) {
 509			of_node_put(dn);
 510			break;
 511		}
 512
 513		if (cpu < nr_cpu_ids)
 514			cpu = assign_threads(cpu, nthreads, avail, intserv);
 515	}
 516
 517	/* If no SMT supported, nthreads is forced to 1 */
 518	if (!cpu_has_feature(CPU_FTR_SMT)) {
 519		DBG("  SMT disabled ! nthreads forced to 1\n");
 520		nthreads = 1;
 521	}
 522
 523#ifdef CONFIG_PPC64
 524	/*
 525	 * On pSeries LPAR, we need to know how many cpus
 526	 * could possibly be added to this partition.
 527	 */
 528	if (firmware_has_feature(FW_FEATURE_LPAR) &&
 529	    (dn = of_find_node_by_path("/rtas"))) {
 530		int num_addr_cell, num_size_cell, maxcpus;
 531		const __be32 *ireg;
 532
 533		num_addr_cell = of_n_addr_cells(dn);
 534		num_size_cell = of_n_size_cells(dn);
 535
 536		ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
 537
 538		if (!ireg)
 539			goto out;
 540
 541		maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
 542
 543		/* Double maxcpus for processors which have SMT capability */
 544		if (cpu_has_feature(CPU_FTR_SMT))
 545			maxcpus *= nthreads;
 546
 547		if (maxcpus > nr_cpu_ids) {
 548			printk(KERN_WARNING
 549			       "Partition configured for %d cpus, "
 550			       "operating system maximum is %u.\n",
 551			       maxcpus, nr_cpu_ids);
 552			maxcpus = nr_cpu_ids;
 553		} else
 554			printk(KERN_INFO "Partition configured for %d cpus.\n",
 555			       maxcpus);
 556
 557		for (cpu = 0; cpu < maxcpus; cpu++)
 558			set_cpu_possible(cpu, true);
 559	out:
 560		of_node_put(dn);
 561	}
 562#endif
 563#ifdef CONFIG_PPC64_PROC_SYSTEMCFG
 564	systemcfg->processorCount = num_present_cpus();
 565#endif /* CONFIG_PPC64 */
 566
 567        /* Initialize CPU <=> thread mapping/
 568	 *
 569	 * WARNING: We assume that the number of threads is the same for
 570	 * every CPU in the system. If that is not the case, then some code
 571	 * here will have to be reworked
 572	 */
 573	cpu_init_thread_core_maps(nthreads);
 574
 575	/* Now that possible cpus are set, set nr_cpu_ids for later use */
 576	setup_nr_cpu_ids();
 577
 578	free_unused_pacas();
 579}
 580#endif /* CONFIG_SMP */
 581
 582#ifdef CONFIG_PCSPKR_PLATFORM
 583static __init int add_pcspkr(void)
 584{
 585	struct device_node *np;
 586	struct platform_device *pd;
 587	int ret;
 588
 589	np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
 590	of_node_put(np);
 591	if (!np)
 592		return -ENODEV;
 593
 594	pd = platform_device_alloc("pcspkr", -1);
 595	if (!pd)
 596		return -ENOMEM;
 597
 598	ret = platform_device_add(pd);
 599	if (ret)
 600		platform_device_put(pd);
 601
 602	return ret;
 603}
 604device_initcall(add_pcspkr);
 605#endif	/* CONFIG_PCSPKR_PLATFORM */
 606
 607static char ppc_hw_desc_buf[128] __initdata;
 608
 609struct seq_buf ppc_hw_desc __initdata = {
 610	.buffer = ppc_hw_desc_buf,
 611	.size = sizeof(ppc_hw_desc_buf),
 612	.len = 0,
 613};
 614
 615static __init void probe_machine(void)
 616{
 617	extern struct machdep_calls __machine_desc_start;
 618	extern struct machdep_calls __machine_desc_end;
 619	unsigned int i;
 620
 621	/*
 622	 * Iterate all ppc_md structures until we find the proper
 623	 * one for the current machine type
 624	 */
 625	DBG("Probing machine type ...\n");
 626
 627	/*
 628	 * Check ppc_md is empty, if not we have a bug, ie, we setup an
 629	 * entry before probe_machine() which will be overwritten
 630	 */
 631	for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
 632		if (((void **)&ppc_md)[i]) {
 633			printk(KERN_ERR "Entry %d in ppc_md non empty before"
 634			       " machine probe !\n", i);
 635		}
 636	}
 637
 638	for (machine_id = &__machine_desc_start;
 639	     machine_id < &__machine_desc_end;
 640	     machine_id++) {
 641		DBG("  %s ...\n", machine_id->name);
 642		if (machine_id->compatible && !of_machine_is_compatible(machine_id->compatible))
 643			continue;
 644		if (machine_id->compatibles && !of_machine_compatible_match(machine_id->compatibles))
 645			continue;
 646		memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
 647		if (ppc_md.probe && !ppc_md.probe())
 648			continue;
 649		DBG("   %s match !\n", machine_id->name);
 650		break;
 651	}
 652	/* What can we do if we didn't find ? */
 653	if (machine_id >= &__machine_desc_end) {
 654		pr_err("No suitable machine description found !\n");
 655		for (;;);
 656	}
 657
 658	// Append the machine name to other info we've gathered
 659	seq_buf_puts(&ppc_hw_desc, ppc_md.name);
 660
 661	// Set the generic hardware description shown in oopses
 662	dump_stack_set_arch_desc(ppc_hw_desc.buffer);
 663
 664	pr_info("Hardware name: %s\n", ppc_hw_desc.buffer);
 665}
 666
 667/* Match a class of boards, not a specific device configuration. */
 668int check_legacy_ioport(unsigned long base_port)
 669{
 670	struct device_node *parent, *np = NULL;
 671	int ret = -ENODEV;
 672
 673	switch(base_port) {
 674	case I8042_DATA_REG:
 675		if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
 676			np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
 677		if (np) {
 678			parent = of_get_parent(np);
 679
 680			of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
 681			if (!of_i8042_kbd_irq)
 682				of_i8042_kbd_irq = 1;
 683
 684			of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
 685			if (!of_i8042_aux_irq)
 686				of_i8042_aux_irq = 12;
 687
 688			of_node_put(np);
 689			np = parent;
 690			break;
 691		}
 692		np = of_find_node_by_type(NULL, "8042");
 693		/* Pegasos has no device_type on its 8042 node, look for the
 694		 * name instead */
 695		if (!np)
 696			np = of_find_node_by_name(NULL, "8042");
 697		if (np) {
 698			of_i8042_kbd_irq = 1;
 699			of_i8042_aux_irq = 12;
 700		}
 701		break;
 702	case FDC_BASE: /* FDC1 */
 703		np = of_find_node_by_type(NULL, "fdc");
 704		break;
 705	default:
 706		/* ipmi is supposed to fail here */
 707		break;
 708	}
 709	if (!np)
 710		return ret;
 711	parent = of_get_parent(np);
 712	if (parent) {
 713		if (of_node_is_type(parent, "isa"))
 714			ret = 0;
 715		of_node_put(parent);
 716	}
 717	of_node_put(np);
 718	return ret;
 719}
 720EXPORT_SYMBOL(check_legacy_ioport);
 721
 722/*
 723 * Panic notifiers setup
 724 *
 725 * We have 3 notifiers for powerpc, each one from a different "nature":
 726 *
 727 * - ppc_panic_fadump_handler() is a hypervisor notifier, which hard-disables
 728 *   IRQs and deal with the Firmware-Assisted dump, when it is configured;
 729 *   should run early in the panic path.
 730 *
 731 * - dump_kernel_offset() is an informative notifier, just showing the KASLR
 732 *   offset if we have RANDOMIZE_BASE set.
 733 *
 734 * - ppc_panic_platform_handler() is a low-level handler that's registered
 735 *   only if the platform wishes to perform final actions in the panic path,
 736 *   hence it should run late and might not even return. Currently, only
 737 *   pseries and ps3 platforms register callbacks.
 738 */
 739static int ppc_panic_fadump_handler(struct notifier_block *this,
 740				    unsigned long event, void *ptr)
 741{
 742	/*
 743	 * panic does a local_irq_disable, but we really
 744	 * want interrupts to be hard disabled.
 745	 */
 746	hard_irq_disable();
 747
 748	/*
 749	 * If firmware-assisted dump has been registered then trigger
 750	 * its callback and let the firmware handles everything else.
 751	 */
 752	crash_fadump(NULL, ptr);
 753
 754	return NOTIFY_DONE;
 755}
 756
 757static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
 758			      void *p)
 759{
 760	pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
 761		 kaslr_offset(), KERNELBASE);
 762
 763	return NOTIFY_DONE;
 764}
 765
 766static int ppc_panic_platform_handler(struct notifier_block *this,
 767				      unsigned long event, void *ptr)
 768{
 769	/*
 770	 * This handler is only registered if we have a panic callback
 771	 * on ppc_md, hence NULL check is not needed.
 772	 * Also, it may not return, so it runs really late on panic path.
 773	 */
 774	ppc_md.panic(ptr);
 775
 776	return NOTIFY_DONE;
 777}
 778
 779static struct notifier_block ppc_fadump_block = {
 780	.notifier_call = ppc_panic_fadump_handler,
 781	.priority = INT_MAX, /* run early, to notify the firmware ASAP */
 782};
 783
 784static struct notifier_block kernel_offset_notifier = {
 785	.notifier_call = dump_kernel_offset,
 786};
 787
 788static struct notifier_block ppc_panic_block = {
 789	.notifier_call = ppc_panic_platform_handler,
 790	.priority = INT_MIN, /* may not return; must be done last */
 791};
 792
 793void __init setup_panic(void)
 794{
 795	/* Hard-disables IRQs + deal with FW-assisted dump (fadump) */
 796	atomic_notifier_chain_register(&panic_notifier_list,
 797				       &ppc_fadump_block);
 798
 799	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
 800		atomic_notifier_chain_register(&panic_notifier_list,
 801					       &kernel_offset_notifier);
 802
 803	/* Low-level platform-specific routines that should run on panic */
 804	if (ppc_md.panic)
 805		atomic_notifier_chain_register(&panic_notifier_list,
 806					       &ppc_panic_block);
 807}
 808
 809#ifdef CONFIG_CHECK_CACHE_COHERENCY
 810/*
 811 * For platforms that have configurable cache-coherency.  This function
 812 * checks that the cache coherency setting of the kernel matches the setting
 813 * left by the firmware, as indicated in the device tree.  Since a mismatch
 814 * will eventually result in DMA failures, we print * and error and call
 815 * BUG() in that case.
 816 */
 817
 818#define KERNEL_COHERENCY	(!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
 819
 820static int __init check_cache_coherency(void)
 821{
 822	struct device_node *np;
 823	const void *prop;
 824	bool devtree_coherency;
 825
 826	np = of_find_node_by_path("/");
 827	prop = of_get_property(np, "coherency-off", NULL);
 828	of_node_put(np);
 829
 830	devtree_coherency = prop ? false : true;
 831
 832	if (devtree_coherency != KERNEL_COHERENCY) {
 833		printk(KERN_ERR
 834			"kernel coherency:%s != device tree_coherency:%s\n",
 835			str_on_off(KERNEL_COHERENCY),
 836			str_on_off(devtree_coherency));
 837		BUG();
 838	}
 839
 840	return 0;
 841}
 842
 843late_initcall(check_cache_coherency);
 844#endif /* CONFIG_CHECK_CACHE_COHERENCY */
 845
 846void ppc_printk_progress(char *s, unsigned short hex)
 847{
 848	pr_info("%s\n", s);
 849}
 850
 851static __init void print_system_info(void)
 852{
 853	pr_info("-----------------------------------------------------\n");
 854	pr_info("phys_mem_size     = 0x%llx\n",
 855		(unsigned long long)memblock_phys_mem_size());
 856
 857	pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
 858	pr_info("icache_bsize      = 0x%x\n", icache_bsize);
 859
 860	pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
 861	pr_info("  possible        = 0x%016lx\n",
 862		(unsigned long)CPU_FTRS_POSSIBLE);
 863	pr_info("  always          = 0x%016lx\n",
 864		(unsigned long)CPU_FTRS_ALWAYS);
 865	pr_info("cpu_user_features = 0x%08x 0x%08x\n",
 866		cur_cpu_spec->cpu_user_features,
 867		cur_cpu_spec->cpu_user_features2);
 868	pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
 869#ifdef CONFIG_PPC64
 870	pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
 871#ifdef CONFIG_PPC_BOOK3S
 872	pr_info("vmalloc start     = 0x%lx\n", KERN_VIRT_START);
 873	pr_info("IO start          = 0x%lx\n", KERN_IO_START);
 874	pr_info("vmemmap start     = 0x%lx\n", (unsigned long)vmemmap);
 875#endif
 876#endif
 877
 878	if (!early_radix_enabled())
 879		print_system_hash_info();
 880
 881	if (PHYSICAL_START > 0)
 882		pr_info("physical_start    = 0x%llx\n",
 883		       (unsigned long long)PHYSICAL_START);
 884	pr_info("-----------------------------------------------------\n");
 885}
 886
 887#ifdef CONFIG_SMP
 888static void __init smp_setup_pacas(void)
 889{
 890	int cpu;
 891
 892	for_each_possible_cpu(cpu) {
 893		if (cpu == smp_processor_id())
 894			continue;
 895		allocate_paca(cpu);
 896		set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
 897	}
 898
 899	memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32));
 900	cpu_to_phys_id = NULL;
 901}
 902#endif
 903
 904/*
 905 * Called into from start_kernel this initializes memblock, which is used
 906 * to manage page allocation until mem_init is called.
 907 */
 908void __init setup_arch(char **cmdline_p)
 909{
 910	kasan_init();
 911
 912	*cmdline_p = boot_command_line;
 913
 914	/* Set a half-reasonable default so udelay does something sensible */
 915	loops_per_jiffy = 500000000 / HZ;
 916
 917	/* Unflatten the device-tree passed by prom_init or kexec */
 918	unflatten_device_tree();
 919
 920	/*
 921	 * Initialize cache line/block info from device-tree (on ppc64) or
 922	 * just cputable (on ppc32).
 923	 */
 924	initialize_cache_info();
 925
 926	/* Initialize RTAS if available. */
 927	rtas_initialize();
 928
 929	/* Check if we have an initrd provided via the device-tree. */
 930	check_for_initrd();
 931
 932	/* Probe the machine type, establish ppc_md. */
 933	probe_machine();
 934
 935	/* Setup panic notifier if requested by the platform. */
 936	setup_panic();
 937
 938	/*
 939	 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
 940	 * it from their respective probe() function.
 941	 */
 942	setup_power_save();
 943
 944	/* Discover standard serial ports. */
 945	find_legacy_serial_ports();
 946
 947	/* Register early console with the printk subsystem. */
 948	register_early_udbg_console();
 949
 950	/* Setup the various CPU maps based on the device-tree. */
 951	smp_setup_cpu_maps();
 952
 953	/* Initialize xmon. */
 954	xmon_setup();
 955
 956	/* Check the SMT related command line arguments (ppc64). */
 957	check_smt_enabled();
 958
 959	/* Parse memory topology */
 960	mem_topology_setup();
 961	high_memory = (void *)__va(max_low_pfn * PAGE_SIZE);
 962
 963	/*
 964	 * Release secondary cpus out of their spinloops at 0x60 now that
 965	 * we can map physical -> logical CPU ids.
 966	 *
 967	 * Freescale Book3e parts spin in a loop provided by firmware,
 968	 * so smp_release_cpus() does nothing for them.
 969	 */
 970#ifdef CONFIG_SMP
 971	smp_setup_pacas();
 972
 973	/* On BookE, setup per-core TLB data structures. */
 974	setup_tlb_core_data();
 975#endif
 976
 977	/* Print various info about the machine that has been gathered so far. */
 978	print_system_info();
 979
 980	klp_init_thread_info(&init_task);
 981
 982	setup_initial_init_mm(_stext, _etext, _edata, _end);
 983	/* sched_init() does the mmgrab(&init_mm) for the primary CPU */
 984	VM_WARN_ON(cpumask_test_cpu(smp_processor_id(), mm_cpumask(&init_mm)));
 985	cpumask_set_cpu(smp_processor_id(), mm_cpumask(&init_mm));
 986	inc_mm_active_cpus(&init_mm);
 987	mm_iommu_init(&init_mm);
 988
 989	irqstack_early_init();
 990	exc_lvl_early_init();
 991	emergency_stack_init();
 992
 993	mce_init();
 994	smp_release_cpus();
 995
 996	initmem_init();
 997
 998	/*
 999	 * Reserve large chunks of memory for use by CMA for kdump, fadump, KVM and
1000	 * hugetlb. These must be called after initmem_init(), so that
1001	 * pageblock_order is initialised.
1002	 */
1003	fadump_cma_init();
1004	kdump_cma_reserve();
1005	kvm_cma_reserve();
1006	gigantic_hugetlb_cma_reserve();
1007
1008	early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
1009
1010	if (ppc_md.setup_arch)
1011		ppc_md.setup_arch();
1012
1013	setup_barrier_nospec();
1014	setup_spectre_v2();
1015
1016	paging_init();
1017
1018	/* Initialize the MMU context management stuff. */
1019	mmu_context_init();
1020
1021	/* Interrupt code needs to be 64K-aligned. */
1022	if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
1023		panic("Kernelbase not 64K-aligned (0x%lx)!\n",
1024		      (unsigned long)_stext);
1025}