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/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 #include <asm/mce.h>
68 
69 #include "setup.h"
70 
71 #ifdef DEBUG
72 #define DBG(fmt...) udbg_printf(fmt)
73 #else
74 #define DBG(fmt...)
75 #endif
76 
77 /* The main machine-dep calls structure
78  */
79 struct machdep_calls ppc_md;
80 EXPORT_SYMBOL(ppc_md);
81 struct machdep_calls *machine_id;
82 EXPORT_SYMBOL(machine_id);
83 
84 int boot_cpuid = -1;
85 EXPORT_SYMBOL_GPL(boot_cpuid);
86 
87 /*
88  * These are used in binfmt_elf.c to put aux entries on the stack
89  * for each elf executable being started.
90  */
91 int dcache_bsize;
92 int icache_bsize;
93 
94 /*
95  * This still seems to be needed... -- paulus
96  */
97 struct screen_info screen_info = {
98 	.orig_x = 0,
99 	.orig_y = 25,
100 	.orig_video_cols = 80,
101 	.orig_video_lines = 25,
102 	.orig_video_isVGA = 1,
103 	.orig_video_points = 16
104 };
105 #if defined(CONFIG_FB_VGA16_MODULE)
106 EXPORT_SYMBOL(screen_info);
107 #endif
108 
109 /* Variables required to store legacy IO irq routing */
110 int of_i8042_kbd_irq;
111 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
112 int of_i8042_aux_irq;
113 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
114 
115 #ifdef __DO_IRQ_CANON
116 /* XXX should go elsewhere eventually */
117 int ppc_do_canonicalize_irqs;
118 EXPORT_SYMBOL(ppc_do_canonicalize_irqs);
119 #endif
120 
121 #ifdef CONFIG_CRASH_CORE
122 /* This keeps a track of which one is the crashing cpu. */
123 int crashing_cpu = -1;
124 #endif
125 
126 /* also used by kexec */
127 void machine_shutdown(void)
128 {
129 	/*
130 	 * if fadump is active, cleanup the fadump registration before we
131 	 * shutdown.
132 	 */
133 	fadump_cleanup();
134 
135 	if (ppc_md.machine_shutdown)
136 		ppc_md.machine_shutdown();
137 }
138 
139 static void machine_hang(void)
140 {
141 	pr_emerg("System Halted, OK to turn off power\n");
142 	local_irq_disable();
143 	while (1)
144 		;
145 }
146 
147 void machine_restart(char *cmd)
148 {
149 	machine_shutdown();
150 	if (ppc_md.restart)
151 		ppc_md.restart(cmd);
152 
153 	smp_send_stop();
154 
155 	do_kernel_restart(cmd);
156 	mdelay(1000);
157 
158 	machine_hang();
159 }
160 
161 void machine_power_off(void)
162 {
163 	machine_shutdown();
164 	if (pm_power_off)
165 		pm_power_off();
166 
167 	smp_send_stop();
168 	machine_hang();
169 }
170 /* Used by the G5 thermal driver */
171 EXPORT_SYMBOL_GPL(machine_power_off);
172 
173 void (*pm_power_off)(void);
174 EXPORT_SYMBOL_GPL(pm_power_off);
175 
176 void 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
187 DEFINE_PER_CPU(unsigned int, cpu_pvr);
188 #endif
189 
190 static 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 
222 static 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 dont 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 
333 static 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 
344 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
345 {
346 	(*pos)++;
347 	return c_start(m, pos);
348 }
349 
350 static void c_stop(struct seq_file *m, void *v)
351 {
352 }
353 
354 const struct seq_operations cpuinfo_op = {
355 	.start	= c_start,
356 	.next	= c_next,
357 	.stop	= c_stop,
358 	.show	= show_cpuinfo,
359 };
360 
361 void __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 
385 int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
386 cpumask_t threads_core_mask __read_mostly;
387 EXPORT_SYMBOL_GPL(threads_per_core);
388 EXPORT_SYMBOL_GPL(threads_per_subcore);
389 EXPORT_SYMBOL_GPL(threads_shift);
390 EXPORT_SYMBOL_GPL(threads_core_mask);
391 
392 static 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, tpc > 1 ? "s" : "");
411 	printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
412 }
413 
414 
415 u32 *cpu_to_phys_id = NULL;
416 
417 /**
418  * setup_cpu_maps - initialize the following cpu maps:
419  *                  cpu_possible_mask
420  *                  cpu_present_mask
421  *
422  * Having the possible map set up early allows us to restrict allocations
423  * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
424  *
425  * We do not initialize the online map here; cpus set their own bits in
426  * cpu_online_mask as they come up.
427  *
428  * This function is valid only for Open Firmware systems.  finish_device_tree
429  * must be called before using this.
430  *
431  * While we're here, we may as well set the "physical" cpu ids in the paca.
432  *
433  * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
434  */
435 void __init smp_setup_cpu_maps(void)
436 {
437 	struct device_node *dn;
438 	int cpu = 0;
439 	int nthreads = 1;
440 
441 	DBG("smp_setup_cpu_maps()\n");
442 
443 	cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
444 					__alignof__(u32));
445 	if (!cpu_to_phys_id)
446 		panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
447 		      __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
448 
449 	for_each_node_by_type(dn, "cpu") {
450 		const __be32 *intserv;
451 		__be32 cpu_be;
452 		int j, len;
453 
454 		DBG("  * %pOF...\n", dn);
455 
456 		intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
457 				&len);
458 		if (intserv) {
459 			DBG("    ibm,ppc-interrupt-server#s -> %d threads\n",
460 			    nthreads);
461 		} else {
462 			DBG("    no ibm,ppc-interrupt-server#s -> 1 thread\n");
463 			intserv = of_get_property(dn, "reg", &len);
464 			if (!intserv) {
465 				cpu_be = cpu_to_be32(cpu);
466 				/* XXX: what is this? uninitialized?? */
467 				intserv = &cpu_be;	/* assume logical == phys */
468 				len = 4;
469 			}
470 		}
471 
472 		nthreads = len / sizeof(int);
473 
474 		for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
475 			bool avail;
476 
477 			DBG("    thread %d -> cpu %d (hard id %d)\n",
478 			    j, cpu, be32_to_cpu(intserv[j]));
479 
480 			avail = of_device_is_available(dn);
481 			if (!avail)
482 				avail = !of_property_match_string(dn,
483 						"enable-method", "spin-table");
484 
485 			set_cpu_present(cpu, avail);
486 			set_cpu_possible(cpu, true);
487 			cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
488 			cpu++;
489 		}
490 
491 		if (cpu >= nr_cpu_ids) {
492 			of_node_put(dn);
493 			break;
494 		}
495 	}
496 
497 	/* If no SMT supported, nthreads is forced to 1 */
498 	if (!cpu_has_feature(CPU_FTR_SMT)) {
499 		DBG("  SMT disabled ! nthreads forced to 1\n");
500 		nthreads = 1;
501 	}
502 
503 #ifdef CONFIG_PPC64
504 	/*
505 	 * On pSeries LPAR, we need to know how many cpus
506 	 * could possibly be added to this partition.
507 	 */
508 	if (firmware_has_feature(FW_FEATURE_LPAR) &&
509 	    (dn = of_find_node_by_path("/rtas"))) {
510 		int num_addr_cell, num_size_cell, maxcpus;
511 		const __be32 *ireg;
512 
513 		num_addr_cell = of_n_addr_cells(dn);
514 		num_size_cell = of_n_size_cells(dn);
515 
516 		ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
517 
518 		if (!ireg)
519 			goto out;
520 
521 		maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
522 
523 		/* Double maxcpus for processors which have SMT capability */
524 		if (cpu_has_feature(CPU_FTR_SMT))
525 			maxcpus *= nthreads;
526 
527 		if (maxcpus > nr_cpu_ids) {
528 			printk(KERN_WARNING
529 			       "Partition configured for %d cpus, "
530 			       "operating system maximum is %u.\n",
531 			       maxcpus, nr_cpu_ids);
532 			maxcpus = nr_cpu_ids;
533 		} else
534 			printk(KERN_INFO "Partition configured for %d cpus.\n",
535 			       maxcpus);
536 
537 		for (cpu = 0; cpu < maxcpus; cpu++)
538 			set_cpu_possible(cpu, true);
539 	out:
540 		of_node_put(dn);
541 	}
542 	vdso_data->processorCount = num_present_cpus();
543 #endif /* CONFIG_PPC64 */
544 
545         /* Initialize CPU <=> thread mapping/
546 	 *
547 	 * WARNING: We assume that the number of threads is the same for
548 	 * every CPU in the system. If that is not the case, then some code
549 	 * here will have to be reworked
550 	 */
551 	cpu_init_thread_core_maps(nthreads);
552 
553 	/* Now that possible cpus are set, set nr_cpu_ids for later use */
554 	setup_nr_cpu_ids();
555 
556 	free_unused_pacas();
557 }
558 #endif /* CONFIG_SMP */
559 
560 #ifdef CONFIG_PCSPKR_PLATFORM
561 static __init int add_pcspkr(void)
562 {
563 	struct device_node *np;
564 	struct platform_device *pd;
565 	int ret;
566 
567 	np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
568 	of_node_put(np);
569 	if (!np)
570 		return -ENODEV;
571 
572 	pd = platform_device_alloc("pcspkr", -1);
573 	if (!pd)
574 		return -ENOMEM;
575 
576 	ret = platform_device_add(pd);
577 	if (ret)
578 		platform_device_put(pd);
579 
580 	return ret;
581 }
582 device_initcall(add_pcspkr);
583 #endif	/* CONFIG_PCSPKR_PLATFORM */
584 
585 static __init void probe_machine(void)
586 {
587 	extern struct machdep_calls __machine_desc_start;
588 	extern struct machdep_calls __machine_desc_end;
589 	unsigned int i;
590 
591 	/*
592 	 * Iterate all ppc_md structures until we find the proper
593 	 * one for the current machine type
594 	 */
595 	DBG("Probing machine type ...\n");
596 
597 	/*
598 	 * Check ppc_md is empty, if not we have a bug, ie, we setup an
599 	 * entry before probe_machine() which will be overwritten
600 	 */
601 	for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
602 		if (((void **)&ppc_md)[i]) {
603 			printk(KERN_ERR "Entry %d in ppc_md non empty before"
604 			       " machine probe !\n", i);
605 		}
606 	}
607 
608 	for (machine_id = &__machine_desc_start;
609 	     machine_id < &__machine_desc_end;
610 	     machine_id++) {
611 		DBG("  %s ...", machine_id->name);
612 		memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
613 		if (ppc_md.probe()) {
614 			DBG(" match !\n");
615 			break;
616 		}
617 		DBG("\n");
618 	}
619 	/* What can we do if we didn't find ? */
620 	if (machine_id >= &__machine_desc_end) {
621 		pr_err("No suitable machine description found !\n");
622 		for (;;);
623 	}
624 
625 	printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
626 }
627 
628 /* Match a class of boards, not a specific device configuration. */
629 int check_legacy_ioport(unsigned long base_port)
630 {
631 	struct device_node *parent, *np = NULL;
632 	int ret = -ENODEV;
633 
634 	switch(base_port) {
635 	case I8042_DATA_REG:
636 		if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
637 			np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
638 		if (np) {
639 			parent = of_get_parent(np);
640 
641 			of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
642 			if (!of_i8042_kbd_irq)
643 				of_i8042_kbd_irq = 1;
644 
645 			of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
646 			if (!of_i8042_aux_irq)
647 				of_i8042_aux_irq = 12;
648 
649 			of_node_put(np);
650 			np = parent;
651 			break;
652 		}
653 		np = of_find_node_by_type(NULL, "8042");
654 		/* Pegasos has no device_type on its 8042 node, look for the
655 		 * name instead */
656 		if (!np)
657 			np = of_find_node_by_name(NULL, "8042");
658 		if (np) {
659 			of_i8042_kbd_irq = 1;
660 			of_i8042_aux_irq = 12;
661 		}
662 		break;
663 	case FDC_BASE: /* FDC1 */
664 		np = of_find_node_by_type(NULL, "fdc");
665 		break;
666 	default:
667 		/* ipmi is supposed to fail here */
668 		break;
669 	}
670 	if (!np)
671 		return ret;
672 	parent = of_get_parent(np);
673 	if (parent) {
674 		if (of_node_is_type(parent, "isa"))
675 			ret = 0;
676 		of_node_put(parent);
677 	}
678 	of_node_put(np);
679 	return ret;
680 }
681 EXPORT_SYMBOL(check_legacy_ioport);
682 
683 static int ppc_panic_event(struct notifier_block *this,
684                              unsigned long event, void *ptr)
685 {
686 	/*
687 	 * panic does a local_irq_disable, but we really
688 	 * want interrupts to be hard disabled.
689 	 */
690 	hard_irq_disable();
691 
692 	/*
693 	 * If firmware-assisted dump has been registered then trigger
694 	 * firmware-assisted dump and let firmware handle everything else.
695 	 */
696 	crash_fadump(NULL, ptr);
697 	if (ppc_md.panic)
698 		ppc_md.panic(ptr);  /* May not return */
699 	return NOTIFY_DONE;
700 }
701 
702 static struct notifier_block ppc_panic_block = {
703 	.notifier_call = ppc_panic_event,
704 	.priority = INT_MIN /* may not return; must be done last */
705 };
706 
707 /*
708  * Dump out kernel offset information on panic.
709  */
710 static int dump_kernel_offset(struct notifier_block *self, unsigned long v,
711 			      void *p)
712 {
713 	pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n",
714 		 kaslr_offset(), KERNELBASE);
715 
716 	return 0;
717 }
718 
719 static struct notifier_block kernel_offset_notifier = {
720 	.notifier_call = dump_kernel_offset
721 };
722 
723 void __init setup_panic(void)
724 {
725 	if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0)
726 		atomic_notifier_chain_register(&panic_notifier_list,
727 					       &kernel_offset_notifier);
728 
729 	/* PPC64 always does a hard irq disable in its panic handler */
730 	if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
731 		return;
732 	atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
733 }
734 
735 #ifdef CONFIG_CHECK_CACHE_COHERENCY
736 /*
737  * For platforms that have configurable cache-coherency.  This function
738  * checks that the cache coherency setting of the kernel matches the setting
739  * left by the firmware, as indicated in the device tree.  Since a mismatch
740  * will eventually result in DMA failures, we print * and error and call
741  * BUG() in that case.
742  */
743 
744 #define KERNEL_COHERENCY	(!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
745 
746 static int __init check_cache_coherency(void)
747 {
748 	struct device_node *np;
749 	const void *prop;
750 	bool devtree_coherency;
751 
752 	np = of_find_node_by_path("/");
753 	prop = of_get_property(np, "coherency-off", NULL);
754 	of_node_put(np);
755 
756 	devtree_coherency = prop ? false : true;
757 
758 	if (devtree_coherency != KERNEL_COHERENCY) {
759 		printk(KERN_ERR
760 			"kernel coherency:%s != device tree_coherency:%s\n",
761 			KERNEL_COHERENCY ? "on" : "off",
762 			devtree_coherency ? "on" : "off");
763 		BUG();
764 	}
765 
766 	return 0;
767 }
768 
769 late_initcall(check_cache_coherency);
770 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
771 
772 void ppc_printk_progress(char *s, unsigned short hex)
773 {
774 	pr_info("%s\n", s);
775 }
776 
777 static __init void print_system_info(void)
778 {
779 	pr_info("-----------------------------------------------------\n");
780 	pr_info("phys_mem_size     = 0x%llx\n",
781 		(unsigned long long)memblock_phys_mem_size());
782 
783 	pr_info("dcache_bsize      = 0x%x\n", dcache_bsize);
784 	pr_info("icache_bsize      = 0x%x\n", icache_bsize);
785 
786 	pr_info("cpu_features      = 0x%016lx\n", cur_cpu_spec->cpu_features);
787 	pr_info("  possible        = 0x%016lx\n",
788 		(unsigned long)CPU_FTRS_POSSIBLE);
789 	pr_info("  always          = 0x%016lx\n",
790 		(unsigned long)CPU_FTRS_ALWAYS);
791 	pr_info("cpu_user_features = 0x%08x 0x%08x\n",
792 		cur_cpu_spec->cpu_user_features,
793 		cur_cpu_spec->cpu_user_features2);
794 	pr_info("mmu_features      = 0x%08x\n", cur_cpu_spec->mmu_features);
795 #ifdef CONFIG_PPC64
796 	pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
797 #ifdef CONFIG_PPC_BOOK3S
798 	pr_info("vmalloc start     = 0x%lx\n", KERN_VIRT_START);
799 	pr_info("IO start          = 0x%lx\n", KERN_IO_START);
800 	pr_info("vmemmap start     = 0x%lx\n", (unsigned long)vmemmap);
801 #endif
802 #endif
803 
804 	if (!early_radix_enabled())
805 		print_system_hash_info();
806 
807 	if (PHYSICAL_START > 0)
808 		pr_info("physical_start    = 0x%llx\n",
809 		       (unsigned long long)PHYSICAL_START);
810 	pr_info("-----------------------------------------------------\n");
811 }
812 
813 #ifdef CONFIG_SMP
814 static void __init smp_setup_pacas(void)
815 {
816 	int cpu;
817 
818 	for_each_possible_cpu(cpu) {
819 		if (cpu == smp_processor_id())
820 			continue;
821 		allocate_paca(cpu);
822 		set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
823 	}
824 
825 	memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32));
826 	cpu_to_phys_id = NULL;
827 }
828 #endif
829 
830 /*
831  * Called into from start_kernel this initializes memblock, which is used
832  * to manage page allocation until mem_init is called.
833  */
834 void __init setup_arch(char **cmdline_p)
835 {
836 	kasan_init();
837 
838 	*cmdline_p = boot_command_line;
839 
840 	/* Set a half-reasonable default so udelay does something sensible */
841 	loops_per_jiffy = 500000000 / HZ;
842 
843 	/* Unflatten the device-tree passed by prom_init or kexec */
844 	unflatten_device_tree();
845 
846 	/*
847 	 * Initialize cache line/block info from device-tree (on ppc64) or
848 	 * just cputable (on ppc32).
849 	 */
850 	initialize_cache_info();
851 
852 	/* Initialize RTAS if available. */
853 	rtas_initialize();
854 
855 	/* Check if we have an initrd provided via the device-tree. */
856 	check_for_initrd();
857 
858 	/* Probe the machine type, establish ppc_md. */
859 	probe_machine();
860 
861 	/* Setup panic notifier if requested by the platform. */
862 	setup_panic();
863 
864 	/*
865 	 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
866 	 * it from their respective probe() function.
867 	 */
868 	setup_power_save();
869 
870 	/* Discover standard serial ports. */
871 	find_legacy_serial_ports();
872 
873 	/* Register early console with the printk subsystem. */
874 	register_early_udbg_console();
875 
876 	/* Setup the various CPU maps based on the device-tree. */
877 	smp_setup_cpu_maps();
878 
879 	/* Initialize xmon. */
880 	xmon_setup();
881 
882 	/* Check the SMT related command line arguments (ppc64). */
883 	check_smt_enabled();
884 
885 	/* Parse memory topology */
886 	mem_topology_setup();
887 
888 	/*
889 	 * Release secondary cpus out of their spinloops at 0x60 now that
890 	 * we can map physical -> logical CPU ids.
891 	 *
892 	 * Freescale Book3e parts spin in a loop provided by firmware,
893 	 * so smp_release_cpus() does nothing for them.
894 	 */
895 #ifdef CONFIG_SMP
896 	smp_setup_pacas();
897 
898 	/* On BookE, setup per-core TLB data structures. */
899 	setup_tlb_core_data();
900 #endif
901 
902 	/* Print various info about the machine that has been gathered so far. */
903 	print_system_info();
904 
905 	/* Reserve large chunks of memory for use by CMA for KVM. */
906 	kvm_cma_reserve();
907 
908 	/*  Reserve large chunks of memory for us by CMA for hugetlb */
909 	gigantic_hugetlb_cma_reserve();
910 
911 	klp_init_thread_info(&init_task);
912 
913 	setup_initial_init_mm(_stext, _etext, _edata, _end);
914 
915 	mm_iommu_init(&init_mm);
916 	irqstack_early_init();
917 	exc_lvl_early_init();
918 	emergency_stack_init();
919 
920 	mce_init();
921 	smp_release_cpus();
922 
923 	initmem_init();
924 
925 	early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
926 
927 	if (ppc_md.setup_arch)
928 		ppc_md.setup_arch();
929 
930 	setup_barrier_nospec();
931 	setup_spectre_v2();
932 
933 	paging_init();
934 
935 	/* Initialize the MMU context management stuff. */
936 	mmu_context_init();
937 
938 	/* Interrupt code needs to be 64K-aligned. */
939 	if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
940 		panic("Kernelbase not 64K-aligned (0x%lx)!\n",
941 		      (unsigned long)_stext);
942 }
943