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 */
 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 0x1008:	/* 740P/750P ?? */
310				maj = ((pvr >> 8) & 0xFF) - 1;
311				min = pvr & 0xFF;
312				break;
313			case 0x004e: /* POWER9 bits 12-15 give chip type */
314			case 0x0080: /* POWER10 bit 12 gives SMT8/4 */
315				maj = (pvr >> 8) & 0x0F;
316				min = pvr & 0xFF;
317				break;
318			default:
319				maj = (pvr >> 8) & 0xFF;
320				min = pvr & 0xFF;
321				break;
322		}
323	}
324
325	seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
326		   maj, min, PVR_VER(pvr), PVR_REV(pvr));
327
328	if (IS_ENABLED(CONFIG_PPC32))
329		seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
330			   (loops_per_jiffy / (5000 / HZ)) % 100);
331
332	seq_printf(m, "\n");
333
334	/* If this is the last cpu, print the summary */
335	if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
336		show_cpuinfo_summary(m);
337
338	return 0;
339}
340
341static void *c_start(struct seq_file *m, loff_t *pos)
342{
343	if (*pos == 0)	/* just in case, cpu 0 is not the first */
344		*pos = cpumask_first(cpu_online_mask);
345	else
346		*pos = cpumask_next(*pos - 1, cpu_online_mask);
347	if ((*pos) < nr_cpu_ids)
348		return (void *)(unsigned long)(*pos + 1);
349	return NULL;
350}
351
352static void *c_next(struct seq_file *m, void *v, loff_t *pos)
353{
354	(*pos)++;
355	return c_start(m, pos);
356}
357
358static void c_stop(struct seq_file *m, void *v)
359{
360}
361
362const struct seq_operations cpuinfo_op = {
363	.start	= c_start,
364	.next	= c_next,
365	.stop	= c_stop,
366	.show	= show_cpuinfo,
367};
368
369void __init check_for_initrd(void)
370{
371#ifdef CONFIG_BLK_DEV_INITRD
372	DBG(" -> check_for_initrd()  initrd_start=0x%lx  initrd_end=0x%lx\n",
373	    initrd_start, initrd_end);
374
375	/* If we were passed an initrd, set the ROOT_DEV properly if the values
376	 * look sensible. If not, clear initrd reference.
377	 */
378	if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
379	    initrd_end > initrd_start)
380		ROOT_DEV = Root_RAM0;
381	else
382		initrd_start = initrd_end = 0;
383
384	if (initrd_start)
385		pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
386
387	DBG(" <- check_for_initrd()\n");
388#endif /* CONFIG_BLK_DEV_INITRD */
389}
390
391#ifdef CONFIG_SMP
392
393int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
394cpumask_t threads_core_mask __read_mostly;
395EXPORT_SYMBOL_GPL(threads_per_core);
396EXPORT_SYMBOL_GPL(threads_per_subcore);
397EXPORT_SYMBOL_GPL(threads_shift);
398EXPORT_SYMBOL_GPL(threads_core_mask);
399
400static void __init cpu_init_thread_core_maps(int tpc)
401{
402	int i;
403
404	threads_per_core = tpc;
405	threads_per_subcore = tpc;
406	cpumask_clear(&threads_core_mask);
407
408	/* This implementation only supports power of 2 number of threads
409	 * for simplicity and performance
410	 */
411	threads_shift = ilog2(tpc);
412	BUG_ON(tpc != (1 << threads_shift));
413
414	for (i = 0; i < tpc; i++)
415		cpumask_set_cpu(i, &threads_core_mask);
416
417	printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
418	       tpc, tpc > 1 ? "s" : "");
419	printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
420}
421
422
423u32 *cpu_to_phys_id = NULL;
424
425/**
426 * setup_cpu_maps - initialize the following cpu maps:
427 *                  cpu_possible_mask
428 *                  cpu_present_mask
429 *
430 * Having the possible map set up early allows us to restrict allocations
431 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
432 *
433 * We do not initialize the online map here; cpus set their own bits in
434 * cpu_online_mask as they come up.
435 *
436 * This function is valid only for Open Firmware systems.  finish_device_tree
437 * must be called before using this.
438 *
439 * While we're here, we may as well set the "physical" cpu ids in the paca.
440 *
441 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
442 */
443void __init smp_setup_cpu_maps(void)
444{
445	struct device_node *dn;
446	int cpu = 0;
447	int nthreads = 1;
448
449	DBG("smp_setup_cpu_maps()\n");
450
451	cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
452					__alignof__(u32));
453	if (!cpu_to_phys_id)
454		panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
455		      __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
456
457	for_each_node_by_type(dn, "cpu") {
458		const __be32 *intserv;
459		__be32 cpu_be;
460		int j, len;
461
462		DBG("  * %pOF...\n", dn);
463
464		intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
465				&len);
466		if (intserv) {
467			DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
468			    nthreads);
469		} else {
470			DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
471			intserv = of_get_property(dn, "reg", &len);
472			if (!intserv) {
473				cpu_be = cpu_to_be32(cpu);
474				/* XXX: what is this? uninitialized?? */
475				intserv = &cpu_be;	/* assume logical == phys */
476				len = 4;
477			}
478		}
479
480		nthreads = len / sizeof(int);
481
482		for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
483			bool avail;
484
485			DBG("    thread %d -> cpu %d (hard id %d)\n",
486			    j, cpu, be32_to_cpu(intserv[j]));
487
488			avail = of_device_is_available(dn);
489			if (!avail)
490				avail = !of_property_match_string(dn,
491						"enable-method", "spin-table");
492
493			set_cpu_present(cpu, avail);
494			set_cpu_possible(cpu, true);
495			cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
496			cpu++;
497		}
498
499		if (cpu >= nr_cpu_ids) {
500			of_node_put(dn);
501			break;
502		}
503	}
504
505	/* If no SMT supported, nthreads is forced to 1 */
506	if (!cpu_has_feature(CPU_FTR_SMT)) {
507		DBG("  SMT disabled ! nthreads forced to 1\n");
508		nthreads = 1;
509	}
510
511#ifdef CONFIG_PPC64
512	/*
513	 * On pSeries LPAR, we need to know how many cpus
514	 * could possibly be added to this partition.
515	 */
516	if (firmware_has_feature(FW_FEATURE_LPAR) &&
517	    (dn = of_find_node_by_path("/rtas"))) {
518		int num_addr_cell, num_size_cell, maxcpus;
519		const __be32 *ireg;
520
521		num_addr_cell = of_n_addr_cells(dn);
522		num_size_cell = of_n_size_cells(dn);
523
524		ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
525
526		if (!ireg)
527			goto out;
528
529		maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
530
531		/* Double maxcpus for processors which have SMT capability */
532		if (cpu_has_feature(CPU_FTR_SMT))
533			maxcpus *= nthreads;
534
535		if (maxcpus > nr_cpu_ids) {
536			printk(KERN_WARNING
537			       "Partition configured for %d cpus, "
538			       "operating system maximum is %u.\n",
539			       maxcpus, nr_cpu_ids);
540			maxcpus = nr_cpu_ids;
541		} else
542			printk(KERN_INFO "Partition configured for %d cpus.\n",
543			       maxcpus);
544
545		for (cpu = 0; cpu < maxcpus; cpu++)
546			set_cpu_possible(cpu, true);
547	out:
548		of_node_put(dn);
549	}
550	vdso_data->processorCount = num_present_cpus();
551#endif /* CONFIG_PPC64 */
552
553        /* Initialize CPU <=> thread mapping/
554	 *
555	 * WARNING: We assume that the number of threads is the same for
556	 * every CPU in the system. If that is not the case, then some code
557	 * here will have to be reworked
558	 */
559	cpu_init_thread_core_maps(nthreads);
560
561	/* Now that possible cpus are set, set nr_cpu_ids for later use */
562	setup_nr_cpu_ids();
563
564	free_unused_pacas();
565}
566#endif /* CONFIG_SMP */
567
568#ifdef CONFIG_PCSPKR_PLATFORM
569static __init int add_pcspkr(void)
570{
571	struct device_node *np;
572	struct platform_device *pd;
573	int ret;
574
575	np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
576	of_node_put(np);
577	if (!np)
578		return -ENODEV;
579
580	pd = platform_device_alloc("pcspkr", -1);
581	if (!pd)
582		return -ENOMEM;
583
584	ret = platform_device_add(pd);
585	if (ret)
586		platform_device_put(pd);
587
588	return ret;
589}
590device_initcall(add_pcspkr);
591#endif	/* CONFIG_PCSPKR_PLATFORM */
592
593void probe_machine(void)
594{
595	extern struct machdep_calls __machine_desc_start;
596	extern struct machdep_calls __machine_desc_end;
597	unsigned int i;
598
599	/*
600	 * Iterate all ppc_md structures until we find the proper
601	 * one for the current machine type
602	 */
603	DBG("Probing machine type ...\n");
604
605	/*
606	 * Check ppc_md is empty, if not we have a bug, ie, we setup an
607	 * entry before probe_machine() which will be overwritten
608	 */
609	for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
610		if (((void **)&ppc_md)[i]) {
611			printk(KERN_ERR "Entry %d in ppc_md non empty before"
612			       " machine probe !\n", i);
613		}
614	}
615
616	for (machine_id = &__machine_desc_start;
617	     machine_id < &__machine_desc_end;
618	     machine_id++) {
619		DBG("  %s ...", machine_id->name);
620		memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
621		if (ppc_md.probe()) {
622			DBG(" match !\n");
623			break;
624		}
625		DBG("\n");
626	}
627	/* What can we do if we didn't find ? */
628	if (machine_id >= &__machine_desc_end) {
629		pr_err("No suitable machine description found !\n");
630		for (;;);
631	}
632
633	printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
634}
635
636/* Match a class of boards, not a specific device configuration. */
637int check_legacy_ioport(unsigned long base_port)
638{
639	struct device_node *parent, *np = NULL;
640	int ret = -ENODEV;
641
642	switch(base_port) {
643	case I8042_DATA_REG:
644		if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
645			np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
646		if (np) {
647			parent = of_get_parent(np);
648
649			of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
650			if (!of_i8042_kbd_irq)
651				of_i8042_kbd_irq = 1;
652
653			of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
654			if (!of_i8042_aux_irq)
655				of_i8042_aux_irq = 12;
656
657			of_node_put(np);
658			np = parent;
659			break;
660		}
661		np = of_find_node_by_type(NULL, "8042");
662		/* Pegasos has no device_type on its 8042 node, look for the
663		 * name instead */
664		if (!np)
665			np = of_find_node_by_name(NULL, "8042");
666		if (np) {
667			of_i8042_kbd_irq = 1;
668			of_i8042_aux_irq = 12;
669		}
670		break;
671	case FDC_BASE: /* FDC1 */
672		np = of_find_node_by_type(NULL, "fdc");
673		break;
674	default:
675		/* ipmi is supposed to fail here */
676		break;
677	}
678	if (!np)
679		return ret;
680	parent = of_get_parent(np);
681	if (parent) {
682		if (of_node_is_type(parent, "isa"))
683			ret = 0;
684		of_node_put(parent);
685	}
686	of_node_put(np);
687	return ret;
688}
689EXPORT_SYMBOL(check_legacy_ioport);
690
691static int ppc_panic_event(struct notifier_block *this,
692                             unsigned long event, void *ptr)
693{
694	/*
695	 * panic does a local_irq_disable, but we really
696	 * want interrupts to be hard disabled.
697	 */
698	hard_irq_disable();
699
700	/*
701	 * If firmware-assisted dump has been registered then trigger
702	 * firmware-assisted dump and let firmware handle everything else.
703	 */
704	crash_fadump(NULL, ptr);
705	if (ppc_md.panic)
706		ppc_md.panic(ptr);  /* May not return */
707	return NOTIFY_DONE;
708}
709
710static struct notifier_block ppc_panic_block = {
711	.notifier_call = ppc_panic_event,
712	.priority = INT_MIN /* may not return; must be done last */
713};
714
715/*
716 * Dump out kernel offset information on panic.
717 */
718static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
719			      void *p)
720{
721	pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
722		 kaslr_offset(), KERNELBASE);
723
724	return 0;
725}
726
727static struct notifier_block kernel_offset_notifier = {
728	.notifier_call = dump_kernel_offset
729};
730
731void __init setup_panic(void)
732{
733	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
734		atomic_notifier_chain_register(&panic_notifier_list,
735					       &kernel_offset_notifier);
736
737	/* PPC64 always does a hard irq disable in its panic handler */
738	if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
739		return;
740	atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
741}
742
743#ifdef CONFIG_CHECK_CACHE_COHERENCY
744/*
745 * For platforms that have configurable cache-coherency.  This function
746 * checks that the cache coherency setting of the kernel matches the setting
747 * left by the firmware, as indicated in the device tree.  Since a mismatch
748 * will eventually result in DMA failures, we print * and error and call
749 * BUG() in that case.
750 */
751
752#define KERNEL_COHERENCY	(!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
753
754static int __init check_cache_coherency(void)
755{
756	struct device_node *np;
757	const void *prop;
758	bool devtree_coherency;
759
760	np = of_find_node_by_path("/");
761	prop = of_get_property(np, "coherency-off", NULL);
762	of_node_put(np);
763
764	devtree_coherency = prop ? false : true;
765
766	if (devtree_coherency != KERNEL_COHERENCY) {
767		printk(KERN_ERR
768			"kernel coherency:%s != device tree_coherency:%s\n",
769			KERNEL_COHERENCY ? "on" : "off",
770			devtree_coherency ? "on" : "off");
771		BUG();
772	}
773
774	return 0;
775}
776
777late_initcall(check_cache_coherency);
778#endif /* CONFIG_CHECK_CACHE_COHERENCY */
779
780#ifdef CONFIG_DEBUG_FS
781struct dentry *powerpc_debugfs_root;
782EXPORT_SYMBOL(powerpc_debugfs_root);
783
784static int powerpc_debugfs_init(void)
785{
786	powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
787	return 0;
 
788}
789arch_initcall(powerpc_debugfs_init);
790#endif
791
792void ppc_printk_progress(char *s, unsigned short hex)
793{
794	pr_info("%s\n", s);
795}
796
797static __init void print_system_info(void)
798{
799	pr_info("-----------------------------------------------------\n");
800	pr_info("phys_mem_size     = 0x%llx\n",
801		(unsigned long long)memblock_phys_mem_size());
802
803	pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
804	pr_info("icache_bsize      = 0x%x\n", icache_bsize);
805	if (ucache_bsize != 0)
806		pr_info("ucache_bsize      = 0x%x\n", ucache_bsize);
807
808	pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
809	pr_info("  possible        = 0x%016lx\n",
810		(unsigned long)CPU_FTRS_POSSIBLE);
811	pr_info("  always          = 0x%016lx\n",
812		(unsigned long)CPU_FTRS_ALWAYS);
813	pr_info("cpu_user_features = 0x%08x 0x%08x\n",
814		cur_cpu_spec->cpu_user_features,
815		cur_cpu_spec->cpu_user_features2);
816	pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
817#ifdef CONFIG_PPC64
818	pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
819#ifdef CONFIG_PPC_BOOK3S
820	pr_info("vmalloc start     = 0x%lx\n", KERN_VIRT_START);
821	pr_info("IO start          = 0x%lx\n", KERN_IO_START);
822	pr_info("vmemmap start     = 0x%lx\n", (unsigned long)vmemmap);
823#endif
824#endif
825
826	if (!early_radix_enabled())
827		print_system_hash_info();
828
829	if (PHYSICAL_START > 0)
830		pr_info("physical_start    = 0x%llx\n",
831		       (unsigned long long)PHYSICAL_START);
832	pr_info("-----------------------------------------------------\n");
833}
834
835#ifdef CONFIG_SMP
836static void smp_setup_pacas(void)
837{
838	int cpu;
839
840	for_each_possible_cpu(cpu) {
841		if (cpu == smp_processor_id())
842			continue;
843		allocate_paca(cpu);
844		set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
845	}
846
847	memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
848	cpu_to_phys_id = NULL;
849}
850#endif
851
852/*
853 * Called into from start_kernel this initializes memblock, which is used
854 * to manage page allocation until mem_init is called.
855 */
856void __init setup_arch(char **cmdline_p)
857{
858	kasan_init();
859
860	*cmdline_p = boot_command_line;
861
862	/* Set a half-reasonable default so udelay does something sensible */
863	loops_per_jiffy = 500000000 / HZ;
864
865	/* Unflatten the device-tree passed by prom_init or kexec */
866	unflatten_device_tree();
867
868	/*
869	 * Initialize cache line/block info from device-tree (on ppc64) or
870	 * just cputable (on ppc32).
871	 */
872	initialize_cache_info();
873
874	/* Initialize RTAS if available. */
875	rtas_initialize();
876
877	/* Check if we have an initrd provided via the device-tree. */
878	check_for_initrd();
879
880	/* Probe the machine type, establish ppc_md. */
881	probe_machine();
882
883	/* Setup panic notifier if requested by the platform. */
884	setup_panic();
885
886	/*
887	 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
888	 * it from their respective probe() function.
889	 */
890	setup_power_save();
891
892	/* Discover standard serial ports. */
893	find_legacy_serial_ports();
894
895	/* Register early console with the printk subsystem. */
896	register_early_udbg_console();
897
898	/* Setup the various CPU maps based on the device-tree. */
899	smp_setup_cpu_maps();
900
901	/* Initialize xmon. */
902	xmon_setup();
903
904	/* Check the SMT related command line arguments (ppc64). */
905	check_smt_enabled();
906
907	/* Parse memory topology */
908	mem_topology_setup();
909
910	/*
911	 * Release secondary cpus out of their spinloops at 0x60 now that
912	 * we can map physical -> logical CPU ids.
913	 *
914	 * Freescale Book3e parts spin in a loop provided by firmware,
915	 * so smp_release_cpus() does nothing for them.
916	 */
917#ifdef CONFIG_SMP
918	smp_setup_pacas();
919
920	/* On BookE, setup per-core TLB data structures. */
921	setup_tlb_core_data();
922
923	smp_release_cpus();
924#endif
925
926	/* Print various info about the machine that has been gathered so far. */
927	print_system_info();
928
929	/* Reserve large chunks of memory for use by CMA for KVM. */
930	kvm_cma_reserve();
931
932	/*  Reserve large chunks of memory for us by CMA for hugetlb */
933	gigantic_hugetlb_cma_reserve();
934
935	klp_init_thread_info(&init_task);
936
937	init_mm.start_code = (unsigned long)_stext;
938	init_mm.end_code = (unsigned long) _etext;
939	init_mm.end_data = (unsigned long) _edata;
940	init_mm.brk = klimit;
941
942	mm_iommu_init(&init_mm);
943	irqstack_early_init();
944	exc_lvl_early_init();
945	emergency_stack_init();
946
947	initmem_init();
948
949	early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
 
 
 
950
951	if (ppc_md.setup_arch)
952		ppc_md.setup_arch();
953
954	setup_barrier_nospec();
955	setup_spectre_v2();
956
957	paging_init();
958
959	/* Initialize the MMU context management stuff. */
960	mmu_context_init();
961
962	/* Interrupt code needs to be 64K-aligned. */
963	if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
964		panic("Kernelbase not 64K-aligned (0x%lx)!\n",
965		      (unsigned long)_stext);
966}