1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * Common boot and setup code for both 32-bit and 64-bit.
4 * Extracted from arch/powerpc/kernel/setup_64.c.
5 *
6 * Copyright (C) 2001 PPC64 Team, IBM Corp
7 */
8
9 #undef DEBUG
10
11 #include <linux/export.h>
12 #include <linux/string.h>
13 #include <linux/sched.h>
14 #include <linux/init.h>
15 #include <linux/kernel.h>
16 #include <linux/reboot.h>
17 #include <linux/delay.h>
18 #include <linux/initrd.h>
19 #include <linux/platform_device.h>
20 #include <linux/seq_file.h>
21 #include <linux/ioport.h>
22 #include <linux/console.h>
23 #include <linux/screen_info.h>
24 #include <linux/root_dev.h>
25 #include <linux/notifier.h>
26 #include <linux/cpu.h>
27 #include <linux/unistd.h>
28 #include <linux/serial.h>
29 #include <linux/serial_8250.h>
30 #include <linux/percpu.h>
31 #include <linux/memblock.h>
32 #include <linux/of_platform.h>
33 #include <linux/hugetlb.h>
34 #include <asm/debugfs.h>
35 #include <asm/io.h>
36 #include <asm/paca.h>
37 #include <asm/prom.h>
38 #include <asm/processor.h>
39 #include <asm/vdso_datapage.h>
40 #include <asm/pgtable.h>
41 #include <asm/smp.h>
42 #include <asm/elf.h>
43 #include <asm/machdep.h>
44 #include <asm/time.h>
45 #include <asm/cputable.h>
46 #include <asm/sections.h>
47 #include <asm/firmware.h>
48 #include <asm/btext.h>
49 #include <asm/nvram.h>
50 #include <asm/setup.h>
51 #include <asm/rtas.h>
52 #include <asm/iommu.h>
53 #include <asm/serial.h>
54 #include <asm/cache.h>
55 #include <asm/page.h>
56 #include <asm/mmu.h>
57 #include <asm/xmon.h>
58 #include <asm/cputhreads.h>
59 #include <mm/mmu_decl.h>
60 #include <asm/fadump.h>
61 #include <asm/udbg.h>
62 #include <asm/hugetlb.h>
63 #include <asm/livepatch.h>
64 #include <asm/mmu_context.h>
65 #include <asm/cpu_has_feature.h>
66 #include <asm/kasan.h>
67
68 #include "setup.h"
69
70 #ifdef DEBUG
71 #include <asm/udbg.h>
72 #define DBG(fmt...) udbg_printf(fmt)
73 #else
74 #define DBG(fmt...)
75 #endif
76
77 /* The main machine-dep calls structure
78 */
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 int ucache_bsize;
94
95
96 unsigned long klimit = (unsigned long) _end;
97
98 /*
99 * This still seems to be needed... -- paulus
100 */
101 struct 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)
110 EXPORT_SYMBOL(screen_info);
111 #endif
112
113 /* Variables required to store legacy IO irq routing */
114 int of_i8042_kbd_irq;
115 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq);
116 int of_i8042_aux_irq;
117 EXPORT_SYMBOL_GPL(of_i8042_aux_irq);
118
119 #ifdef __DO_IRQ_CANON
120 /* XXX should go elsewhere eventually */
121 int ppc_do_canonicalize_irqs;
122 EXPORT_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. */
127 int crashing_cpu = -1;
128 #endif
129
130 /* also used by kexec */
machine_shutdown(void)131 void 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
machine_hang(void)143 static 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
machine_restart(char * cmd)151 void 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
machine_power_off(void)165 void 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 */
175 EXPORT_SYMBOL_GPL(machine_power_off);
176
177 void (*pm_power_off)(void);
178 EXPORT_SYMBOL_GPL(pm_power_off);
179
machine_halt(void)180 void 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
191 DEFINE_PER_CPU(unsigned int, cpu_pvr);
192 #endif
193
show_cpuinfo_summary(struct seq_file * m)194 static 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
show_cpuinfo(struct seq_file * m,void * v)226 static int show_cpuinfo(struct seq_file *m, void *v)
227 {
228 unsigned long cpu_id = (unsigned long)v - 1;
229 unsigned int pvr;
230 unsigned long proc_freq;
231 unsigned short maj;
232 unsigned short min;
233
234 #ifdef CONFIG_SMP
235 pvr = per_cpu(cpu_pvr, cpu_id);
236 #else
237 pvr = mfspr(SPRN_PVR);
238 #endif
239 maj = (pvr >> 8) & 0xFF;
240 min = pvr & 0xFF;
241
242 seq_printf(m, "processor\t: %lu\n", cpu_id);
243 seq_printf(m, "cpu\t\t: ");
244
245 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name)
246 seq_printf(m, "%s", cur_cpu_spec->cpu_name);
247 else
248 seq_printf(m, "unknown (%08x)", pvr);
249
250 if (cpu_has_feature(CPU_FTR_ALTIVEC))
251 seq_printf(m, ", altivec supported");
252
253 seq_printf(m, "\n");
254
255 #ifdef CONFIG_TAU
256 if (cpu_has_feature(CPU_FTR_TAU)) {
257 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) {
258 /* more straightforward, but potentially misleading */
259 seq_printf(m, "temperature \t: %u C (uncalibrated)\n",
260 cpu_temp(cpu_id));
261 } else {
262 /* show the actual temp sensor range */
263 u32 temp;
264 temp = cpu_temp_both(cpu_id);
265 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n",
266 temp & 0xff, temp >> 16);
267 }
268 }
269 #endif /* CONFIG_TAU */
270
271 /*
272 * Platforms that have variable clock rates, should implement
273 * the method ppc_md.get_proc_freq() that reports the clock
274 * rate of a given cpu. The rest can use ppc_proc_freq to
275 * report the clock rate that is same across all cpus.
276 */
277 if (ppc_md.get_proc_freq)
278 proc_freq = ppc_md.get_proc_freq(cpu_id);
279 else
280 proc_freq = ppc_proc_freq;
281
282 if (proc_freq)
283 seq_printf(m, "clock\t\t: %lu.%06luMHz\n",
284 proc_freq / 1000000, proc_freq % 1000000);
285
286 if (ppc_md.show_percpuinfo != NULL)
287 ppc_md.show_percpuinfo(m, cpu_id);
288
289 /* If we are a Freescale core do a simple check so
290 * we dont have to keep adding cases in the future */
291 if (PVR_VER(pvr) & 0x8000) {
292 switch (PVR_VER(pvr)) {
293 case 0x8000: /* 7441/7450/7451, Voyager */
294 case 0x8001: /* 7445/7455, Apollo 6 */
295 case 0x8002: /* 7447/7457, Apollo 7 */
296 case 0x8003: /* 7447A, Apollo 7 PM */
297 case 0x8004: /* 7448, Apollo 8 */
298 case 0x800c: /* 7410, Nitro */
299 maj = ((pvr >> 8) & 0xF);
300 min = PVR_MIN(pvr);
301 break;
302 default: /* e500/book-e */
303 maj = PVR_MAJ(pvr);
304 min = PVR_MIN(pvr);
305 break;
306 }
307 } else {
308 switch (PVR_VER(pvr)) {
309 case 0x0020: /* 403 family */
310 maj = PVR_MAJ(pvr) + 1;
311 min = PVR_MIN(pvr);
312 break;
313 case 0x1008: /* 740P/750P ?? */
314 maj = ((pvr >> 8) & 0xFF) - 1;
315 min = pvr & 0xFF;
316 break;
317 case 0x004e: /* POWER9 bits 12-15 give chip type */
318 maj = (pvr >> 8) & 0x0F;
319 min = pvr & 0xFF;
320 break;
321 default:
322 maj = (pvr >> 8) & 0xFF;
323 min = pvr & 0xFF;
324 break;
325 }
326 }
327
328 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n",
329 maj, min, PVR_VER(pvr), PVR_REV(pvr));
330
331 if (IS_ENABLED(CONFIG_PPC32))
332 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ),
333 (loops_per_jiffy / (5000 / HZ)) % 100);
334
335 seq_printf(m, "\n");
336
337 /* If this is the last cpu, print the summary */
338 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids)
339 show_cpuinfo_summary(m);
340
341 return 0;
342 }
343
c_start(struct seq_file * m,loff_t * pos)344 static void *c_start(struct seq_file *m, loff_t *pos)
345 {
346 if (*pos == 0) /* just in case, cpu 0 is not the first */
347 *pos = cpumask_first(cpu_online_mask);
348 else
349 *pos = cpumask_next(*pos - 1, cpu_online_mask);
350 if ((*pos) < nr_cpu_ids)
351 return (void *)(unsigned long)(*pos + 1);
352 return NULL;
353 }
354
c_next(struct seq_file * m,void * v,loff_t * pos)355 static void *c_next(struct seq_file *m, void *v, loff_t *pos)
356 {
357 (*pos)++;
358 return c_start(m, pos);
359 }
360
c_stop(struct seq_file * m,void * v)361 static void c_stop(struct seq_file *m, void *v)
362 {
363 }
364
365 const struct seq_operations cpuinfo_op = {
366 .start = c_start,
367 .next = c_next,
368 .stop = c_stop,
369 .show = show_cpuinfo,
370 };
371
check_for_initrd(void)372 void __init check_for_initrd(void)
373 {
374 #ifdef CONFIG_BLK_DEV_INITRD
375 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n",
376 initrd_start, initrd_end);
377
378 /* If we were passed an initrd, set the ROOT_DEV properly if the values
379 * look sensible. If not, clear initrd reference.
380 */
381 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) &&
382 initrd_end > initrd_start)
383 ROOT_DEV = Root_RAM0;
384 else
385 initrd_start = initrd_end = 0;
386
387 if (initrd_start)
388 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end);
389
390 DBG(" <- check_for_initrd()\n");
391 #endif /* CONFIG_BLK_DEV_INITRD */
392 }
393
394 #ifdef CONFIG_SMP
395
396 int threads_per_core, threads_per_subcore, threads_shift __read_mostly;
397 cpumask_t threads_core_mask __read_mostly;
398 EXPORT_SYMBOL_GPL(threads_per_core);
399 EXPORT_SYMBOL_GPL(threads_per_subcore);
400 EXPORT_SYMBOL_GPL(threads_shift);
401 EXPORT_SYMBOL_GPL(threads_core_mask);
402
cpu_init_thread_core_maps(int tpc)403 static void __init cpu_init_thread_core_maps(int tpc)
404 {
405 int i;
406
407 threads_per_core = tpc;
408 threads_per_subcore = tpc;
409 cpumask_clear(&threads_core_mask);
410
411 /* This implementation only supports power of 2 number of threads
412 * for simplicity and performance
413 */
414 threads_shift = ilog2(tpc);
415 BUG_ON(tpc != (1 << threads_shift));
416
417 for (i = 0; i < tpc; i++)
418 cpumask_set_cpu(i, &threads_core_mask);
419
420 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n",
421 tpc, tpc > 1 ? "s" : "");
422 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift);
423 }
424
425
426 u32 *cpu_to_phys_id = NULL;
427
428 /**
429 * setup_cpu_maps - initialize the following cpu maps:
430 * cpu_possible_mask
431 * cpu_present_mask
432 *
433 * Having the possible map set up early allows us to restrict allocations
434 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS.
435 *
436 * We do not initialize the online map here; cpus set their own bits in
437 * cpu_online_mask as they come up.
438 *
439 * This function is valid only for Open Firmware systems. finish_device_tree
440 * must be called before using this.
441 *
442 * While we're here, we may as well set the "physical" cpu ids in the paca.
443 *
444 * NOTE: This must match the parsing done in early_init_dt_scan_cpus.
445 */
smp_setup_cpu_maps(void)446 void __init smp_setup_cpu_maps(void)
447 {
448 struct device_node *dn;
449 int cpu = 0;
450 int nthreads = 1;
451
452 DBG("smp_setup_cpu_maps()\n");
453
454 cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32),
455 __alignof__(u32));
456 if (!cpu_to_phys_id)
457 panic("%s: Failed to allocate %zu bytes align=0x%zx\n",
458 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32));
459
460 for_each_node_by_type(dn, "cpu") {
461 const __be32 *intserv;
462 __be32 cpu_be;
463 int j, len;
464
465 DBG(" * %pOF...\n", dn);
466
467 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s",
468 &len);
469 if (intserv) {
470 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n",
471 nthreads);
472 } else {
473 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n");
474 intserv = of_get_property(dn, "reg", &len);
475 if (!intserv) {
476 cpu_be = cpu_to_be32(cpu);
477 /* XXX: what is this? uninitialized?? */
478 intserv = &cpu_be; /* assume logical == phys */
479 len = 4;
480 }
481 }
482
483 nthreads = len / sizeof(int);
484
485 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) {
486 bool avail;
487
488 DBG(" thread %d -> cpu %d (hard id %d)\n",
489 j, cpu, be32_to_cpu(intserv[j]));
490
491 avail = of_device_is_available(dn);
492 if (!avail)
493 avail = !of_property_match_string(dn,
494 "enable-method", "spin-table");
495
496 set_cpu_present(cpu, avail);
497 set_cpu_possible(cpu, true);
498 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]);
499 cpu++;
500 }
501
502 if (cpu >= nr_cpu_ids) {
503 of_node_put(dn);
504 break;
505 }
506 }
507
508 /* If no SMT supported, nthreads is forced to 1 */
509 if (!cpu_has_feature(CPU_FTR_SMT)) {
510 DBG(" SMT disabled ! nthreads forced to 1\n");
511 nthreads = 1;
512 }
513
514 #ifdef CONFIG_PPC64
515 /*
516 * On pSeries LPAR, we need to know how many cpus
517 * could possibly be added to this partition.
518 */
519 if (firmware_has_feature(FW_FEATURE_LPAR) &&
520 (dn = of_find_node_by_path("/rtas"))) {
521 int num_addr_cell, num_size_cell, maxcpus;
522 const __be32 *ireg;
523
524 num_addr_cell = of_n_addr_cells(dn);
525 num_size_cell = of_n_size_cells(dn);
526
527 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL);
528
529 if (!ireg)
530 goto out;
531
532 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell);
533
534 /* Double maxcpus for processors which have SMT capability */
535 if (cpu_has_feature(CPU_FTR_SMT))
536 maxcpus *= nthreads;
537
538 if (maxcpus > nr_cpu_ids) {
539 printk(KERN_WARNING
540 "Partition configured for %d cpus, "
541 "operating system maximum is %u.\n",
542 maxcpus, nr_cpu_ids);
543 maxcpus = nr_cpu_ids;
544 } else
545 printk(KERN_INFO "Partition configured for %d cpus.\n",
546 maxcpus);
547
548 for (cpu = 0; cpu < maxcpus; cpu++)
549 set_cpu_possible(cpu, true);
550 out:
551 of_node_put(dn);
552 }
553 vdso_data->processorCount = num_present_cpus();
554 #endif /* CONFIG_PPC64 */
555
556 /* Initialize CPU <=> thread mapping/
557 *
558 * WARNING: We assume that the number of threads is the same for
559 * every CPU in the system. If that is not the case, then some code
560 * here will have to be reworked
561 */
562 cpu_init_thread_core_maps(nthreads);
563
564 /* Now that possible cpus are set, set nr_cpu_ids for later use */
565 setup_nr_cpu_ids();
566
567 free_unused_pacas();
568 }
569 #endif /* CONFIG_SMP */
570
571 #ifdef CONFIG_PCSPKR_PLATFORM
add_pcspkr(void)572 static __init int add_pcspkr(void)
573 {
574 struct device_node *np;
575 struct platform_device *pd;
576 int ret;
577
578 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100");
579 of_node_put(np);
580 if (!np)
581 return -ENODEV;
582
583 pd = platform_device_alloc("pcspkr", -1);
584 if (!pd)
585 return -ENOMEM;
586
587 ret = platform_device_add(pd);
588 if (ret)
589 platform_device_put(pd);
590
591 return ret;
592 }
593 device_initcall(add_pcspkr);
594 #endif /* CONFIG_PCSPKR_PLATFORM */
595
probe_machine(void)596 void probe_machine(void)
597 {
598 extern struct machdep_calls __machine_desc_start;
599 extern struct machdep_calls __machine_desc_end;
600 unsigned int i;
601
602 /*
603 * Iterate all ppc_md structures until we find the proper
604 * one for the current machine type
605 */
606 DBG("Probing machine type ...\n");
607
608 /*
609 * Check ppc_md is empty, if not we have a bug, ie, we setup an
610 * entry before probe_machine() which will be overwritten
611 */
612 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) {
613 if (((void **)&ppc_md)[i]) {
614 printk(KERN_ERR "Entry %d in ppc_md non empty before"
615 " machine probe !\n", i);
616 }
617 }
618
619 for (machine_id = &__machine_desc_start;
620 machine_id < &__machine_desc_end;
621 machine_id++) {
622 DBG(" %s ...", machine_id->name);
623 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls));
624 if (ppc_md.probe()) {
625 DBG(" match !\n");
626 break;
627 }
628 DBG("\n");
629 }
630 /* What can we do if we didn't find ? */
631 if (machine_id >= &__machine_desc_end) {
632 pr_err("No suitable machine description found !\n");
633 for (;;);
634 }
635
636 printk(KERN_INFO "Using %s machine description\n", ppc_md.name);
637 }
638
639 /* Match a class of boards, not a specific device configuration. */
check_legacy_ioport(unsigned long base_port)640 int check_legacy_ioport(unsigned long base_port)
641 {
642 struct device_node *parent, *np = NULL;
643 int ret = -ENODEV;
644
645 switch(base_port) {
646 case I8042_DATA_REG:
647 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303")))
648 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03");
649 if (np) {
650 parent = of_get_parent(np);
651
652 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0);
653 if (!of_i8042_kbd_irq)
654 of_i8042_kbd_irq = 1;
655
656 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1);
657 if (!of_i8042_aux_irq)
658 of_i8042_aux_irq = 12;
659
660 of_node_put(np);
661 np = parent;
662 break;
663 }
664 np = of_find_node_by_type(NULL, "8042");
665 /* Pegasos has no device_type on its 8042 node, look for the
666 * name instead */
667 if (!np)
668 np = of_find_node_by_name(NULL, "8042");
669 if (np) {
670 of_i8042_kbd_irq = 1;
671 of_i8042_aux_irq = 12;
672 }
673 break;
674 case FDC_BASE: /* FDC1 */
675 np = of_find_node_by_type(NULL, "fdc");
676 break;
677 default:
678 /* ipmi is supposed to fail here */
679 break;
680 }
681 if (!np)
682 return ret;
683 parent = of_get_parent(np);
684 if (parent) {
685 if (of_node_is_type(parent, "isa"))
686 ret = 0;
687 of_node_put(parent);
688 }
689 of_node_put(np);
690 return ret;
691 }
692 EXPORT_SYMBOL(check_legacy_ioport);
693
ppc_panic_event(struct notifier_block * this,unsigned long event,void * ptr)694 static int ppc_panic_event(struct notifier_block *this,
695 unsigned long event, void *ptr)
696 {
697 /*
698 * panic does a local_irq_disable, but we really
699 * want interrupts to be hard disabled.
700 */
701 hard_irq_disable();
702
703 /*
704 * If firmware-assisted dump has been registered then trigger
705 * firmware-assisted dump and let firmware handle everything else.
706 */
707 crash_fadump(NULL, ptr);
708 if (ppc_md.panic)
709 ppc_md.panic(ptr); /* May not return */
710 return NOTIFY_DONE;
711 }
712
713 static struct notifier_block ppc_panic_block = {
714 .notifier_call = ppc_panic_event,
715 .priority = INT_MIN /* may not return; must be done last */
716 };
717
setup_panic(void)718 void __init setup_panic(void)
719 {
720 /* PPC64 always does a hard irq disable in its panic handler */
721 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic)
722 return;
723 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block);
724 }
725
726 #ifdef CONFIG_CHECK_CACHE_COHERENCY
727 /*
728 * For platforms that have configurable cache-coherency. This function
729 * checks that the cache coherency setting of the kernel matches the setting
730 * left by the firmware, as indicated in the device tree. Since a mismatch
731 * will eventually result in DMA failures, we print * and error and call
732 * BUG() in that case.
733 */
734
735 #define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE))
736
check_cache_coherency(void)737 static int __init check_cache_coherency(void)
738 {
739 struct device_node *np;
740 const void *prop;
741 bool devtree_coherency;
742
743 np = of_find_node_by_path("/");
744 prop = of_get_property(np, "coherency-off", NULL);
745 of_node_put(np);
746
747 devtree_coherency = prop ? false : true;
748
749 if (devtree_coherency != KERNEL_COHERENCY) {
750 printk(KERN_ERR
751 "kernel coherency:%s != device tree_coherency:%s\n",
752 KERNEL_COHERENCY ? "on" : "off",
753 devtree_coherency ? "on" : "off");
754 BUG();
755 }
756
757 return 0;
758 }
759
760 late_initcall(check_cache_coherency);
761 #endif /* CONFIG_CHECK_CACHE_COHERENCY */
762
763 #ifdef CONFIG_DEBUG_FS
764 struct dentry *powerpc_debugfs_root;
765 EXPORT_SYMBOL(powerpc_debugfs_root);
766
powerpc_debugfs_init(void)767 static int powerpc_debugfs_init(void)
768 {
769 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL);
770
771 return powerpc_debugfs_root == NULL;
772 }
773 arch_initcall(powerpc_debugfs_init);
774 #endif
775
ppc_printk_progress(char * s,unsigned short hex)776 void ppc_printk_progress(char *s, unsigned short hex)
777 {
778 pr_info("%s\n", s);
779 }
780
print_system_info(void)781 static __init void print_system_info(void)
782 {
783 pr_info("-----------------------------------------------------\n");
784 pr_info("phys_mem_size = 0x%llx\n",
785 (unsigned long long)memblock_phys_mem_size());
786
787 pr_info("dcache_bsize = 0x%x\n", dcache_bsize);
788 pr_info("icache_bsize = 0x%x\n", icache_bsize);
789 if (ucache_bsize != 0)
790 pr_info("ucache_bsize = 0x%x\n", ucache_bsize);
791
792 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features);
793 pr_info(" possible = 0x%016lx\n",
794 (unsigned long)CPU_FTRS_POSSIBLE);
795 pr_info(" always = 0x%016lx\n",
796 (unsigned long)CPU_FTRS_ALWAYS);
797 pr_info("cpu_user_features = 0x%08x 0x%08x\n",
798 cur_cpu_spec->cpu_user_features,
799 cur_cpu_spec->cpu_user_features2);
800 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features);
801 #ifdef CONFIG_PPC64
802 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features);
803 #ifdef CONFIG_PPC_BOOK3S
804 pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START);
805 pr_info("IO start = 0x%lx\n", KERN_IO_START);
806 pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap);
807 #endif
808 #endif
809
810 if (!early_radix_enabled())
811 print_system_hash_info();
812
813 if (PHYSICAL_START > 0)
814 pr_info("physical_start = 0x%llx\n",
815 (unsigned long long)PHYSICAL_START);
816 pr_info("-----------------------------------------------------\n");
817 }
818
819 #ifdef CONFIG_SMP
smp_setup_pacas(void)820 static void smp_setup_pacas(void)
821 {
822 int cpu;
823
824 for_each_possible_cpu(cpu) {
825 if (cpu == smp_processor_id())
826 continue;
827 allocate_paca(cpu);
828 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]);
829 }
830
831 memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32));
832 cpu_to_phys_id = NULL;
833 }
834 #endif
835
836 /*
837 * Called into from start_kernel this initializes memblock, which is used
838 * to manage page allocation until mem_init is called.
839 */
setup_arch(char ** cmdline_p)840 void __init setup_arch(char **cmdline_p)
841 {
842 kasan_init();
843
844 *cmdline_p = boot_command_line;
845
846 /* Set a half-reasonable default so udelay does something sensible */
847 loops_per_jiffy = 500000000 / HZ;
848
849 /* Unflatten the device-tree passed by prom_init or kexec */
850 unflatten_device_tree();
851
852 /*
853 * Initialize cache line/block info from device-tree (on ppc64) or
854 * just cputable (on ppc32).
855 */
856 initialize_cache_info();
857
858 /* Initialize RTAS if available. */
859 rtas_initialize();
860
861 /* Check if we have an initrd provided via the device-tree. */
862 check_for_initrd();
863
864 /* Probe the machine type, establish ppc_md. */
865 probe_machine();
866
867 /* Setup panic notifier if requested by the platform. */
868 setup_panic();
869
870 /*
871 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do
872 * it from their respective probe() function.
873 */
874 setup_power_save();
875
876 /* Discover standard serial ports. */
877 find_legacy_serial_ports();
878
879 /* Register early console with the printk subsystem. */
880 register_early_udbg_console();
881
882 /* Setup the various CPU maps based on the device-tree. */
883 smp_setup_cpu_maps();
884
885 /* Initialize xmon. */
886 xmon_setup();
887
888 /* Check the SMT related command line arguments (ppc64). */
889 check_smt_enabled();
890
891 /* Parse memory topology */
892 mem_topology_setup();
893
894 /*
895 * Release secondary cpus out of their spinloops at 0x60 now that
896 * we can map physical -> logical CPU ids.
897 *
898 * Freescale Book3e parts spin in a loop provided by firmware,
899 * so smp_release_cpus() does nothing for them.
900 */
901 #ifdef CONFIG_SMP
902 smp_setup_pacas();
903
904 /* On BookE, setup per-core TLB data structures. */
905 setup_tlb_core_data();
906 #endif
907
908 /* Print various info about the machine that has been gathered so far. */
909 print_system_info();
910
911 /* Reserve large chunks of memory for use by CMA for KVM. */
912 kvm_cma_reserve();
913
914 klp_init_thread_info(&init_task);
915
916 init_mm.start_code = (unsigned long)_stext;
917 init_mm.end_code = (unsigned long) _etext;
918 init_mm.end_data = (unsigned long) _edata;
919 init_mm.brk = klimit;
920
921 mm_iommu_init(&init_mm);
922 irqstack_early_init();
923 exc_lvl_early_init();
924 emergency_stack_init();
925
926 smp_release_cpus();
927
928 initmem_init();
929
930 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT);
931
932 if (IS_ENABLED(CONFIG_DUMMY_CONSOLE))
933 conswitchp = &dummy_con;
934
935 if (ppc_md.setup_arch)
936 ppc_md.setup_arch();
937
938 setup_barrier_nospec();
939 setup_spectre_v2();
940
941 paging_init();
942
943 /* Initialize the MMU context management stuff. */
944 mmu_context_init();
945
946 /* Interrupt code needs to be 64K-aligned. */
947 if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff)
948 panic("Kernelbase not 64K-aligned (0x%lx)!\n",
949 (unsigned long)_stext);
950 }
951