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/seq_file.h>
 22#include <linux/ioport.h>
 23#include <linux/console.h>
 24#include <linux/screen_info.h>
 25#include <linux/root_dev.h>
 26#include <linux/notifier.h>
 27#include <linux/cpu.h>
 28#include <linux/unistd.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_platform.h>
 34#include <linux/hugetlb.h>
 35#include <linux/pgtable.h>
 36#include <asm/debugfs.h>
 37#include <asm/io.h>
 38#include <asm/paca.h>
 39#include <asm/prom.h>
 40#include <asm/processor.h>
 41#include <asm/vdso_datapage.h>
 
 42#include <asm/smp.h>
 43#include <asm/elf.h>
 44#include <asm/machdep.h>
 45#include <asm/time.h>
 46#include <asm/cputable.h>
 47#include <asm/sections.h>
 48#include <asm/firmware.h>
 49#include <asm/btext.h>
 50#include <asm/nvram.h>
 51#include <asm/setup.h>
 52#include <asm/rtas.h>
 53#include <asm/iommu.h>
 54#include <asm/serial.h>
 55#include <asm/cache.h>
 56#include <asm/page.h>
 57#include <asm/mmu.h>
 58#include <asm/xmon.h>
 59#include <asm/cputhreads.h>
 60#include <mm/mmu_decl.h>
 61#include <asm/fadump.h>
 62#include <asm/udbg.h>
 63#include <asm/hugetlb.h>
 64#include <asm/livepatch.h>
 65#include <asm/mmu_context.h>
 66#include <asm/cpu_has_feature.h>
 67#include <asm/kasan.h>
 68#include <asm/mce.h>
 69
 70#include "setup.h"
 71
 72#ifdef DEBUG
 
 73#define DBG(fmt...) udbg_printf(fmt)
 74#else
 75#define DBG(fmt...)
 76#endif
 77
 78/* The main machine-dep calls structure
 79 */
 80struct machdep_calls ppc_md;
 81EXPORT_SYMBOL(ppc_md);
 82struct machdep_calls *machine_id;
 83EXPORT_SYMBOL(machine_id);
 84
 85int boot_cpuid = -1;
 86EXPORT_SYMBOL_GPL(boot_cpuid);
 87
 88/*
 89 * These are used in binfmt_elf.c to put aux entries on the stack
 90 * for each elf executable being started.
 91 */
 92int dcache_bsize;
 93int icache_bsize;
 94
 95/*
 96 * This still seems to be needed... -- paulus
 97 */ 
 98struct screen_info screen_info = {
 99	.orig_x = 0,
100	.orig_y = 25,
101	.orig_video_cols = 80,
102	.orig_video_lines = 25,
103	.orig_video_isVGA = 1,
104	.orig_video_points = 16
105};
106#if defined(CONFIG_FB_VGA16_MODULE)
107EXPORT_SYMBOL(screen_info);
108#endif
109
110/* Variables required to store legacy IO irq routing */
111int of_i8042_kbd_irq;
112EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
113int of_i8042_aux_irq;
114EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
115
116#ifdef __DO_IRQ_CANON
117/* XXX should go elsewhere eventually */
118int ppc_do_canonicalize_irqs;
119EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
120#endif
121
122#ifdef CONFIG_CRASH_CORE
123/* This keeps a track of which one is the crashing cpu. */
124int crashing_cpu = -1;
125#endif
126
127/* also used by kexec */
128void machine_shutdown(void)
129{
 
130	/*
131	 * if fadump is active, cleanup the fadump registration before we
132	 * shutdown.
133	 */
134	fadump_cleanup();
 
135
136	if (ppc_md.machine_shutdown)
137		ppc_md.machine_shutdown();
138}
139
140static void machine_hang(void)
141{
142	pr_emerg("System Halted, OK to turn off power\n");
143	local_irq_disable();
144	while (1)
145		;
146}
147
148void machine_restart(char *cmd)
149{
150	machine_shutdown();
151	if (ppc_md.restart)
152		ppc_md.restart(cmd);
153
154	smp_send_stop();
155
156	do_kernel_restart(cmd);
157	mdelay(1000);
158
159	machine_hang();
160}
161
162void machine_power_off(void)
163{
164	machine_shutdown();
165	if (pm_power_off)
166		pm_power_off();
167
168	smp_send_stop();
169	machine_hang();
 
 
 
170}
171/* Used by the G5 thermal driver */
172EXPORT_SYMBOL_GPL(machine_power_off);
173
174void (*pm_power_off)(void);
175EXPORT_SYMBOL_GPL(pm_power_off);
176
177void machine_halt(void)
178{
179	machine_shutdown();
180	if (ppc_md.halt)
181		ppc_md.halt();
182
183	smp_send_stop();
184	machine_hang();
 
 
 
185}
186
 
 
 
 
 
 
187#ifdef CONFIG_SMP
188DEFINE_PER_CPU(unsigned int, cpu_pvr);
189#endif
190
191static void show_cpuinfo_summary(struct seq_file *m)
192{
193	struct device_node *root;
194	const char *model = NULL;
 
195	unsigned long bogosum = 0;
196	int i;
197
198	if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) {
199		for_each_online_cpu(i)
200			bogosum += loops_per_jiffy;
201		seq_printf(m, "total bogomips\t: %lu.%02lu\n",
202			   bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100);
203	}
204	seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq);
205	if (ppc_md.name)
206		seq_printf(m, "platform\t: %s\n", ppc_md.name);
207	root = of_find_node_by_path("/");
208	if (root)
209		model = of_get_property(root, "model", NULL);
210	if (model)
211		seq_printf(m, "model\t\t: %s\n", model);
212	of_node_put(root);
213
214	if (ppc_md.show_cpuinfo != NULL)
215		ppc_md.show_cpuinfo(m);
216
 
217	/* Display the amount of memory */
218	if (IS_ENABLED(CONFIG_PPC32))
219		seq_printf(m, "Memory\t\t: %d MB\n",
220			   (unsigned int)(total_memory / (1024 * 1024)));
221}
222
223static int show_cpuinfo(struct seq_file *m, void *v)
224{
225	unsigned long cpu_id = (unsigned long)v - 1;
226	unsigned int pvr;
227	unsigned long proc_freq;
228	unsigned short maj;
229	unsigned short min;
230
 
 
 
 
 
 
 
 
231#ifdef CONFIG_SMP
232	pvr = per_cpu(cpu_pvr, cpu_id);
233#else
234	pvr = mfspr(SPRN_PVR);
235#endif
236	maj = (pvr >> 8) & 0xFF;
237	min = pvr & 0xFF;
238
239	seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id);
 
240
241	if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
242		seq_puts(m, cur_cpu_spec->cpu_name);
243	else
244		seq_printf(m, "unknown (%08x)", pvr);
245
 
246	if (cpu_has_feature(CPU_FTR_ALTIVEC))
247		seq_puts(m, ", altivec supported");
 
248
249	seq_putc(m, '\n');
250
251#ifdef CONFIG_TAU
252	if (cpu_has_feature(CPU_FTR_TAU)) {
253		if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
254			/* more straightforward, but potentially misleading */
255			seq_printf(m,  "temperature \t: %u C (uncalibrated)\n",
256				   cpu_temp(cpu_id));
257		} else {
258			/* show the actual temp sensor range */
259			u32 temp;
260			temp = cpu_temp_both(cpu_id);
261			seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
262				   temp & 0xff, temp >> 16);
263		}
264	}
265#endif /* CONFIG_TAU */
266
267	/*
268	 * Platforms that have variable clock rates, should implement
269	 * the method ppc_md.get_proc_freq() that reports the clock
270	 * rate of a given cpu. The rest can use ppc_proc_freq to
271	 * report the clock rate that is same across all cpus.
272	 */
273	if (ppc_md.get_proc_freq)
274		proc_freq = ppc_md.get_proc_freq(cpu_id);
275	else
276		proc_freq = ppc_proc_freq;
277
278	if (proc_freq)
279		seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
280			   proc_freq / 1000000, proc_freq % 1000000);
281
282	if (ppc_md.show_percpuinfo != NULL)
283		ppc_md.show_percpuinfo(m, cpu_id);
284
285	/* If we are a Freescale core do a simple check so
286	 * we dont have to keep adding cases in the future */
287	if (PVR_VER(pvr) & 0x8000) {
288		switch (PVR_VER(pvr)) {
289		case 0x8000:	/* 7441/7450/7451, Voyager */
290		case 0x8001:	/* 7445/7455, Apollo 6 */
291		case 0x8002:	/* 7447/7457, Apollo 7 */
292		case 0x8003:	/* 7447A, Apollo 7 PM */
293		case 0x8004:	/* 7448, Apollo 8 */
294		case 0x800c:	/* 7410, Nitro */
295			maj = ((pvr >> 8) & 0xF);
296			min = PVR_MIN(pvr);
297			break;
298		default:	/* e500/book-e */
299			maj = PVR_MAJ(pvr);
300			min = PVR_MIN(pvr);
301			break;
302		}
303	} else {
304		switch (PVR_VER(pvr)) {
 
 
 
 
305			case 0x1008:	/* 740P/750P ?? */
306				maj = ((pvr >> 8) & 0xFF) - 1;
307				min = pvr & 0xFF;
308				break;
309			case 0x004e: /* POWER9 bits 12-15 give chip type */
310			case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
311				maj = (pvr >> 8) & 0x0F;
312				min = pvr & 0xFF;
313				break;
314			default:
315				maj = (pvr >> 8) & 0xFF;
316				min = pvr & 0xFF;
317				break;
318		}
319	}
320
321	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
322		   maj, min, PVR_VER(pvr), PVR_REV(pvr));
323
324	if (IS_ENABLED(CONFIG_PPC32))
325		seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
326			   (loops_per_jiffy / (5000 / HZ)) % 100);
 
 
 
 
 
 
327
328	seq_putc(m, '\n');
329
330	/* If this is the last cpu, print the summary */
331	if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
332		show_cpuinfo_summary(m);
333
334	return 0;
335}
336
337static void *c_start(struct seq_file *m, loff_t *pos)
338{
339	if (*pos == 0)	/* just in case, cpu 0 is not the first */
340		*pos = cpumask_first(cpu_online_mask);
341	else
342		*pos = cpumask_next(*pos - 1, cpu_online_mask);
343	if ((*pos) < nr_cpu_ids)
344		return (void *)(unsigned long)(*pos + 1);
345	return NULL;
346}
347
348static void *c_next(struct seq_file *m, void *v, loff_t *pos)
349{
350	(*pos)++;
351	return c_start(m, pos);
352}
353
354static void c_stop(struct seq_file *m, void *v)
355{
356}
357
358const struct seq_operations cpuinfo_op = {
359	.start	= c_start,
360	.next	= c_next,
361	.stop	= c_stop,
362	.show	= show_cpuinfo,
363};
364
365void __init check_for_initrd(void)
366{
367#ifdef CONFIG_BLK_DEV_INITRD
368	DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
369	    initrd_start, initrd_end);
370
371	/* If we were passed an initrd, set the ROOT_DEV properly if the values
372	 * look sensible. If not, clear initrd reference.
373	 */
374	if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
375	    initrd_end > initrd_start)
376		ROOT_DEV = Root_RAM0;
377	else
378		initrd_start = initrd_end = 0;
379
380	if (initrd_start)
381		pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
382
383	DBG(" <- check_for_initrd()\n");
384#endif /* CONFIG_BLK_DEV_INITRD */
385}
386
387#ifdef CONFIG_SMP
388
389int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
390cpumask_t threads_core_mask __read_mostly;
391EXPORT_SYMBOL_GPL(threads_per_core);
392EXPORT_SYMBOL_GPL(threads_per_subcore);
393EXPORT_SYMBOL_GPL(threads_shift);
394EXPORT_SYMBOL_GPL(threads_core_mask);
395
396static void __init cpu_init_thread_core_maps(int tpc)
397{
398	int i;
399
400	threads_per_core = tpc;
401	threads_per_subcore = tpc;
402	cpumask_clear(&threads_core_mask);
403
404	/* This implementation only supports power of 2 number of threads
405	 * for simplicity and performance
406	 */
407	threads_shift = ilog2(tpc);
408	BUG_ON(tpc != (1 << threads_shift));
409
410	for (i = 0; i < tpc; i++)
411		cpumask_set_cpu(i, &threads_core_mask);
412
413	printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
414	       tpc, tpc > 1 ? "s" : "");
415	printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
416}
417
418
419u32 *cpu_to_phys_id = NULL;
420
421/**
422 * setup_cpu_maps - initialize the following cpu maps:
423 *                  cpu_possible_mask
424 *                  cpu_present_mask
425 *
426 * Having the possible map set up early allows us to restrict allocations
427 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
428 *
429 * We do not initialize the online map here; cpus set their own bits in
430 * cpu_online_mask as they come up.
431 *
432 * This function is valid only for Open Firmware systems.  finish_device_tree
433 * must be called before using this.
434 *
435 * While we're here, we may as well set the "physical" cpu ids in the paca.
436 *
437 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
438 */
439void __init smp_setup_cpu_maps(void)
440{
441	struct device_node *dn;
442	int cpu = 0;
443	int nthreads = 1;
444
445	DBG("smp_setup_cpu_maps()\n");
446
447	cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
448					__alignof__(u32));
449	if (!cpu_to_phys_id)
450		panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
451		      __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
452
453	for_each_node_by_type(dn, "cpu") {
454		const __be32 *intserv;
455		__be32 cpu_be;
456		int j, len;
457
458		DBG("  * %pOF...\n", dn);
459
460		intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
461				&len);
462		if (intserv) {
463			DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
464			    nthreads);
465		} else {
466			DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
467			intserv = of_get_property(dn, "reg", &len);
468			if (!intserv) {
469				cpu_be = cpu_to_be32(cpu);
470				/* XXX: what is this? uninitialized?? */
471				intserv = &cpu_be;	/* assume logical == phys */
472				len = 4;
473			}
474		}
475
476		nthreads = len / sizeof(int);
477
478		for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
479			bool avail;
480
481			DBG("    thread %d -> cpu %d (hard id %d)\n",
482			    j, cpu, be32_to_cpu(intserv[j]));
483
484			avail = of_device_is_available(dn);
485			if (!avail)
486				avail = !of_property_match_string(dn,
487						"enable-method", "spin-table");
488
489			set_cpu_present(cpu, avail);
 
490			set_cpu_possible(cpu, true);
491			cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
492			cpu++;
493		}
494
495		if (cpu >= nr_cpu_ids) {
496			of_node_put(dn);
497			break;
498		}
499	}
500
501	/* If no SMT supported, nthreads is forced to 1 */
502	if (!cpu_has_feature(CPU_FTR_SMT)) {
503		DBG("  SMT disabled ! nthreads forced to 1\n");
504		nthreads = 1;
505	}
506
507#ifdef CONFIG_PPC64
508	/*
509	 * On pSeries LPAR, we need to know how many cpus
510	 * could possibly be added to this partition.
511	 */
512	if (firmware_has_feature(FW_FEATURE_LPAR) &&
513	    (dn = of_find_node_by_path("/rtas"))) {
514		int num_addr_cell, num_size_cell, maxcpus;
515		const __be32 *ireg;
516
517		num_addr_cell = of_n_addr_cells(dn);
518		num_size_cell = of_n_size_cells(dn);
519
520		ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
521
522		if (!ireg)
523			goto out;
524
525		maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
526
527		/* Double maxcpus for processors which have SMT capability */
528		if (cpu_has_feature(CPU_FTR_SMT))
529			maxcpus *= nthreads;
530
531		if (maxcpus > nr_cpu_ids) {
532			printk(KERN_WARNING
533			       "Partition configured for %d cpus, "
534			       "operating system maximum is %u.\n",
535			       maxcpus, nr_cpu_ids);
536			maxcpus = nr_cpu_ids;
537		} else
538			printk(KERN_INFO "Partition configured for %d cpus.\n",
539			       maxcpus);
540
541		for (cpu = 0; cpu < maxcpus; cpu++)
542			set_cpu_possible(cpu, true);
543	out:
544		of_node_put(dn);
545	}
546	vdso_data->processorCount = num_present_cpus();
547#endif /* CONFIG_PPC64 */
548
549        /* Initialize CPU <=> thread mapping/
550	 *
551	 * WARNING: We assume that the number of threads is the same for
552	 * every CPU in the system. If that is not the case, then some code
553	 * here will have to be reworked
554	 */
555	cpu_init_thread_core_maps(nthreads);
556
557	/* Now that possible cpus are set, set nr_cpu_ids for later use */
558	setup_nr_cpu_ids();
559
560	free_unused_pacas();
561}
562#endif /* CONFIG_SMP */
563
564#ifdef CONFIG_PCSPKR_PLATFORM
565static __init int add_pcspkr(void)
566{
567	struct device_node *np;
568	struct platform_device *pd;
569	int ret;
570
571	np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
572	of_node_put(np);
573	if (!np)
574		return -ENODEV;
575
576	pd = platform_device_alloc("pcspkr", -1);
577	if (!pd)
578		return -ENOMEM;
579
580	ret = platform_device_add(pd);
581	if (ret)
582		platform_device_put(pd);
583
584	return ret;
585}
586device_initcall(add_pcspkr);
587#endif	/* CONFIG_PCSPKR_PLATFORM */
588
589void probe_machine(void)
590{
591	extern struct machdep_calls __machine_desc_start;
592	extern struct machdep_calls __machine_desc_end;
593	unsigned int i;
594
595	/*
596	 * Iterate all ppc_md structures until we find the proper
597	 * one for the current machine type
598	 */
599	DBG("Probing machine type ...\n");
600
601	/*
602	 * Check ppc_md is empty, if not we have a bug, ie, we setup an
603	 * entry before probe_machine() which will be overwritten
604	 */
605	for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
606		if (((void **)&ppc_md)[i]) {
607			printk(KERN_ERR "Entry %d in ppc_md non empty before"
608			       " machine probe !\n", i);
609		}
610	}
611
612	for (machine_id = &__machine_desc_start;
613	     machine_id < &__machine_desc_end;
614	     machine_id++) {
615		DBG("  %s ...", machine_id->name);
616		memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
617		if (ppc_md.probe()) {
618			DBG(" match !\n");
619			break;
620		}
621		DBG("\n");
622	}
623	/* What can we do if we didn't find ? */
624	if (machine_id >= &__machine_desc_end) {
625		pr_err("No suitable machine description found !\n");
626		for (;;);
627	}
628
629	printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
630}
631
632/* Match a class of boards, not a specific device configuration. */
633int check_legacy_ioport(unsigned long base_port)
634{
635	struct device_node *parent, *np = NULL;
636	int ret = -ENODEV;
637
638	switch(base_port) {
639	case I8042_DATA_REG:
640		if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
641			np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
642		if (np) {
643			parent = of_get_parent(np);
644
645			of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
646			if (!of_i8042_kbd_irq)
647				of_i8042_kbd_irq = 1;
648
649			of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
650			if (!of_i8042_aux_irq)
651				of_i8042_aux_irq = 12;
652
653			of_node_put(np);
654			np = parent;
655			break;
656		}
657		np = of_find_node_by_type(NULL, "8042");
658		/* Pegasos has no device_type on its 8042 node, look for the
659		 * name instead */
660		if (!np)
661			np = of_find_node_by_name(NULL, "8042");
662		if (np) {
663			of_i8042_kbd_irq = 1;
664			of_i8042_aux_irq = 12;
665		}
666		break;
667	case FDC_BASE: /* FDC1 */
668		np = of_find_node_by_type(NULL, "fdc");
669		break;
670	default:
671		/* ipmi is supposed to fail here */
672		break;
673	}
674	if (!np)
675		return ret;
676	parent = of_get_parent(np);
677	if (parent) {
678		if (of_node_is_type(parent, "isa"))
679			ret = 0;
680		of_node_put(parent);
681	}
682	of_node_put(np);
683	return ret;
684}
685EXPORT_SYMBOL(check_legacy_ioport);
686
687static int ppc_panic_event(struct notifier_block *this,
688                             unsigned long event, void *ptr)
689{
690	/*
691	 * panic does a local_irq_disable, but we really
692	 * want interrupts to be hard disabled.
693	 */
694	hard_irq_disable();
695
696	/*
697	 * If firmware-assisted dump has been registered then trigger
698	 * firmware-assisted dump and let firmware handle everything else.
699	 */
700	crash_fadump(NULL, ptr);
701	if (ppc_md.panic)
702		ppc_md.panic(ptr);  /* May not return */
703	return NOTIFY_DONE;
704}
705
706static struct notifier_block ppc_panic_block = {
707	.notifier_call = ppc_panic_event,
708	.priority = INT_MIN /* may not return; must be done last */
709};
710
711/*
712 * Dump out kernel offset information on panic.
713 */
714static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
715			      void *p)
716{
717	pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
718		 kaslr_offset(), KERNELBASE);
719
720	return 0;
721}
722
723static struct notifier_block kernel_offset_notifier = {
724	.notifier_call = dump_kernel_offset
725};
726
727void __init setup_panic(void)
728{
729	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
730		atomic_notifier_chain_register(&panic_notifier_list,
731					       &kernel_offset_notifier);
732
733	/* PPC64 always does a hard irq disable in its panic handler */
734	if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
735		return;
736	atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
737}
738
739#ifdef CONFIG_CHECK_CACHE_COHERENCY
740/*
741 * For platforms that have configurable cache-coherency.  This function
742 * checks that the cache coherency setting of the kernel matches the setting
743 * left by the firmware, as indicated in the device tree.  Since a mismatch
744 * will eventually result in DMA failures, we print * and error and call
745 * BUG() in that case.
746 */
747
748#define KERNEL_COHERENCY	(!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
 
 
 
 
749
750static int __init check_cache_coherency(void)
751{
752	struct device_node *np;
753	const void *prop;
754	bool devtree_coherency;
755
756	np = of_find_node_by_path("/");
757	prop = of_get_property(np, "coherency-off", NULL);
758	of_node_put(np);
759
760	devtree_coherency = prop ? false : true;
761
762	if (devtree_coherency != KERNEL_COHERENCY) {
763		printk(KERN_ERR
764			"kernel coherency:%s != device tree_coherency:%s\n",
765			KERNEL_COHERENCY ? "on" : "off",
766			devtree_coherency ? "on" : "off");
767		BUG();
768	}
769
770	return 0;
771}
772
773late_initcall(check_cache_coherency);
774#endif /* CONFIG_CHECK_CACHE_COHERENCY */
775
776#ifdef CONFIG_DEBUG_FS
777struct dentry *powerpc_debugfs_root;
778EXPORT_SYMBOL(powerpc_debugfs_root);
779
780static int powerpc_debugfs_init(void)
781{
782	powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
783	return 0;
 
784}
785arch_initcall(powerpc_debugfs_init);
786#endif
787
788void ppc_printk_progress(char *s, unsigned short hex)
789{
790	pr_info("%s\n", s);
791}
792
793static __init void print_system_info(void)
794{
795	pr_info("-----------------------------------------------------\n");
796	pr_info("phys_mem_size     = 0x%llx\n",
797		(unsigned long long)memblock_phys_mem_size());
798
799	pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
800	pr_info("icache_bsize      = 0x%x\n", icache_bsize);
801
802	pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
803	pr_info("  possible        = 0x%016lx\n",
804		(unsigned long)CPU_FTRS_POSSIBLE);
805	pr_info("  always          = 0x%016lx\n",
806		(unsigned long)CPU_FTRS_ALWAYS);
807	pr_info("cpu_user_features = 0x%08x 0x%08x\n",
808		cur_cpu_spec->cpu_user_features,
809		cur_cpu_spec->cpu_user_features2);
810	pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
811#ifdef CONFIG_PPC64
812	pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
813#ifdef CONFIG_PPC_BOOK3S
814	pr_info("vmalloc start     = 0x%lx\n", KERN_VIRT_START);
815	pr_info("IO start          = 0x%lx\n", KERN_IO_START);
816	pr_info("vmemmap start     = 0x%lx\n", (unsigned long)vmemmap);
817#endif
818#endif
819
820	if (!early_radix_enabled())
821		print_system_hash_info();
822
823	if (PHYSICAL_START > 0)
824		pr_info("physical_start    = 0x%llx\n",
825		       (unsigned long long)PHYSICAL_START);
826	pr_info("-----------------------------------------------------\n");
827}
828
829#ifdef CONFIG_SMP
830static void __init smp_setup_pacas(void)
831{
832	int cpu;
833
834	for_each_possible_cpu(cpu) {
835		if (cpu == smp_processor_id())
836			continue;
837		allocate_paca(cpu);
838		set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
839	}
840
841	memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
842	cpu_to_phys_id = NULL;
843}
844#endif
845
846/*
847 * Called into from start_kernel this initializes memblock, which is used
848 * to manage page allocation until mem_init is called.
849 */
850void __init setup_arch(char **cmdline_p)
851{
852	kasan_init();
853
854	*cmdline_p = boot_command_line;
855
856	/* Set a half-reasonable default so udelay does something sensible */
857	loops_per_jiffy = 500000000 / HZ;
858
859	/* Unflatten the device-tree passed by prom_init or kexec */
860	unflatten_device_tree();
861
862	/*
863	 * Initialize cache line/block info from device-tree (on ppc64) or
864	 * just cputable (on ppc32).
865	 */
866	initialize_cache_info();
867
868	/* Initialize RTAS if available. */
869	rtas_initialize();
870
871	/* Check if we have an initrd provided via the device-tree. */
872	check_for_initrd();
873
874	/* Probe the machine type, establish ppc_md. */
875	probe_machine();
876
877	/* Setup panic notifier if requested by the platform. */
878	setup_panic();
879
880	/*
881	 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
882	 * it from their respective probe() function.
883	 */
884	setup_power_save();
885
886	/* Discover standard serial ports. */
887	find_legacy_serial_ports();
888
889	/* Register early console with the printk subsystem. */
890	register_early_udbg_console();
891
892	/* Setup the various CPU maps based on the device-tree. */
893	smp_setup_cpu_maps();
894
895	/* Initialize xmon. */
896	xmon_setup();
897
898	/* Check the SMT related command line arguments (ppc64). */
899	check_smt_enabled();
900
901	/* Parse memory topology */
902	mem_topology_setup();
903
904	/*
905	 * Release secondary cpus out of their spinloops at 0x60 now that
906	 * we can map physical -> logical CPU ids.
907	 *
908	 * Freescale Book3e parts spin in a loop provided by firmware,
909	 * so smp_release_cpus() does nothing for them.
910	 */
911#ifdef CONFIG_SMP
912	smp_setup_pacas();
913
914	/* On BookE, setup per-core TLB data structures. */
915	setup_tlb_core_data();
916#endif
917
918	/* Print various info about the machine that has been gathered so far. */
919	print_system_info();
920
921	/* Reserve large chunks of memory for use by CMA for KVM. */
922	kvm_cma_reserve();
923
924	/*  Reserve large chunks of memory for us by CMA for hugetlb */
925	gigantic_hugetlb_cma_reserve();
926
927	klp_init_thread_info(&init_task);
928
929	setup_initial_init_mm(_stext, _etext, _edata, _end);
930
931	mm_iommu_init(&init_mm);
932	irqstack_early_init();
933	exc_lvl_early_init();
934	emergency_stack_init();
935
936	mce_init();
937	smp_release_cpus();
938
939	initmem_init();
940
941	early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
942
943	if (ppc_md.setup_arch)
944		ppc_md.setup_arch();
945
946	setup_barrier_nospec();
947	setup_spectre_v2();
948
949	paging_init();
950
951	/* Initialize the MMU context management stuff. */
952	mmu_context_init();
953
954	/* Interrupt code needs to be 64K-aligned. */
955	if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
956		panic("Kernelbase not 64K-aligned (0x%lx)!\n",
957		      (unsigned long)_stext);
958}