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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/kernel/setup.c
4 *
5 * Copyright (C) 1995-2001 Russell King
6 */
7#include <linux/efi.h>
8#include <linux/export.h>
9#include <linux/kernel.h>
10#include <linux/stddef.h>
11#include <linux/ioport.h>
12#include <linux/delay.h>
13#include <linux/utsname.h>
14#include <linux/initrd.h>
15#include <linux/console.h>
16#include <linux/seq_file.h>
17#include <linux/screen_info.h>
18#include <linux/init.h>
19#include <linux/kexec.h>
20#include <linux/libfdt.h>
21#include <linux/of.h>
22#include <linux/of_fdt.h>
23#include <linux/cpu.h>
24#include <linux/interrupt.h>
25#include <linux/smp.h>
26#include <linux/proc_fs.h>
27#include <linux/memblock.h>
28#include <linux/bug.h>
29#include <linux/compiler.h>
30#include <linux/sort.h>
31#include <linux/psci.h>
32
33#include <asm/unified.h>
34#include <asm/cp15.h>
35#include <asm/cpu.h>
36#include <asm/cputype.h>
37#include <asm/efi.h>
38#include <asm/elf.h>
39#include <asm/early_ioremap.h>
40#include <asm/fixmap.h>
41#include <asm/procinfo.h>
42#include <asm/psci.h>
43#include <asm/sections.h>
44#include <asm/setup.h>
45#include <asm/smp_plat.h>
46#include <asm/mach-types.h>
47#include <asm/cacheflush.h>
48#include <asm/cachetype.h>
49#include <asm/tlbflush.h>
50#include <asm/xen/hypervisor.h>
51
52#include <asm/prom.h>
53#include <asm/mach/arch.h>
54#include <asm/mach/irq.h>
55#include <asm/mach/time.h>
56#include <asm/system_info.h>
57#include <asm/system_misc.h>
58#include <asm/traps.h>
59#include <asm/unwind.h>
60#include <asm/memblock.h>
61#include <asm/virt.h>
62#include <asm/kasan.h>
63
64#include "atags.h"
65
66
67#if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE)
68char fpe_type[8];
69
70static int __init fpe_setup(char *line)
71{
72 memcpy(fpe_type, line, 8);
73 return 1;
74}
75
76__setup("fpe=", fpe_setup);
77#endif
78
79unsigned int processor_id;
80EXPORT_SYMBOL(processor_id);
81unsigned int __machine_arch_type __read_mostly;
82EXPORT_SYMBOL(__machine_arch_type);
83unsigned int cacheid __read_mostly;
84EXPORT_SYMBOL(cacheid);
85
86unsigned int __atags_pointer __initdata;
87
88unsigned int system_rev;
89EXPORT_SYMBOL(system_rev);
90
91const char *system_serial;
92EXPORT_SYMBOL(system_serial);
93
94unsigned int system_serial_low;
95EXPORT_SYMBOL(system_serial_low);
96
97unsigned int system_serial_high;
98EXPORT_SYMBOL(system_serial_high);
99
100unsigned int elf_hwcap __read_mostly;
101EXPORT_SYMBOL(elf_hwcap);
102
103unsigned int elf_hwcap2 __read_mostly;
104EXPORT_SYMBOL(elf_hwcap2);
105
106
107#ifdef MULTI_CPU
108struct processor processor __ro_after_init;
109#if defined(CONFIG_BIG_LITTLE) && defined(CONFIG_HARDEN_BRANCH_PREDICTOR)
110struct processor *cpu_vtable[NR_CPUS] = {
111 [0] = &processor,
112};
113#endif
114#endif
115#ifdef MULTI_TLB
116struct cpu_tlb_fns cpu_tlb __ro_after_init;
117#endif
118#ifdef MULTI_USER
119struct cpu_user_fns cpu_user __ro_after_init;
120#endif
121#ifdef MULTI_CACHE
122struct cpu_cache_fns cpu_cache __ro_after_init;
123#endif
124#ifdef CONFIG_OUTER_CACHE
125struct outer_cache_fns outer_cache __ro_after_init;
126EXPORT_SYMBOL(outer_cache);
127#endif
128
129/*
130 * Cached cpu_architecture() result for use by assembler code.
131 * C code should use the cpu_architecture() function instead of accessing this
132 * variable directly.
133 */
134int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN;
135
136struct stack {
137 u32 irq[4];
138 u32 abt[4];
139 u32 und[4];
140 u32 fiq[4];
141} ____cacheline_aligned;
142
143#ifndef CONFIG_CPU_V7M
144static struct stack stacks[NR_CPUS];
145#endif
146
147char elf_platform[ELF_PLATFORM_SIZE];
148EXPORT_SYMBOL(elf_platform);
149
150static const char *cpu_name;
151static const char *machine_name;
152static char __initdata cmd_line[COMMAND_LINE_SIZE];
153const struct machine_desc *machine_desc __initdata;
154
155static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } };
156#define ENDIANNESS ((char)endian_test.l)
157
158DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data);
159
160/*
161 * Standard memory resources
162 */
163static struct resource mem_res[] = {
164 {
165 .name = "Video RAM",
166 .start = 0,
167 .end = 0,
168 .flags = IORESOURCE_MEM
169 },
170 {
171 .name = "Kernel code",
172 .start = 0,
173 .end = 0,
174 .flags = IORESOURCE_SYSTEM_RAM
175 },
176 {
177 .name = "Kernel data",
178 .start = 0,
179 .end = 0,
180 .flags = IORESOURCE_SYSTEM_RAM
181 }
182};
183
184#define video_ram mem_res[0]
185#define kernel_code mem_res[1]
186#define kernel_data mem_res[2]
187
188static struct resource io_res[] = {
189 {
190 .name = "reserved",
191 .start = 0x3bc,
192 .end = 0x3be,
193 .flags = IORESOURCE_IO | IORESOURCE_BUSY
194 },
195 {
196 .name = "reserved",
197 .start = 0x378,
198 .end = 0x37f,
199 .flags = IORESOURCE_IO | IORESOURCE_BUSY
200 },
201 {
202 .name = "reserved",
203 .start = 0x278,
204 .end = 0x27f,
205 .flags = IORESOURCE_IO | IORESOURCE_BUSY
206 }
207};
208
209#define lp0 io_res[0]
210#define lp1 io_res[1]
211#define lp2 io_res[2]
212
213static const char *proc_arch[] = {
214 "undefined/unknown",
215 "3",
216 "4",
217 "4T",
218 "5",
219 "5T",
220 "5TE",
221 "5TEJ",
222 "6TEJ",
223 "7",
224 "7M",
225 "?(12)",
226 "?(13)",
227 "?(14)",
228 "?(15)",
229 "?(16)",
230 "?(17)",
231};
232
233#ifdef CONFIG_CPU_V7M
234static int __get_cpu_architecture(void)
235{
236 return CPU_ARCH_ARMv7M;
237}
238#else
239static int __get_cpu_architecture(void)
240{
241 int cpu_arch;
242
243 if ((read_cpuid_id() & 0x0008f000) == 0) {
244 cpu_arch = CPU_ARCH_UNKNOWN;
245 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) {
246 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3;
247 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) {
248 cpu_arch = (read_cpuid_id() >> 16) & 7;
249 if (cpu_arch)
250 cpu_arch += CPU_ARCH_ARMv3;
251 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) {
252 /* Revised CPUID format. Read the Memory Model Feature
253 * Register 0 and check for VMSAv7 or PMSAv7 */
254 unsigned int mmfr0 = read_cpuid_ext(CPUID_EXT_MMFR0);
255 if ((mmfr0 & 0x0000000f) >= 0x00000003 ||
256 (mmfr0 & 0x000000f0) >= 0x00000030)
257 cpu_arch = CPU_ARCH_ARMv7;
258 else if ((mmfr0 & 0x0000000f) == 0x00000002 ||
259 (mmfr0 & 0x000000f0) == 0x00000020)
260 cpu_arch = CPU_ARCH_ARMv6;
261 else
262 cpu_arch = CPU_ARCH_UNKNOWN;
263 } else
264 cpu_arch = CPU_ARCH_UNKNOWN;
265
266 return cpu_arch;
267}
268#endif
269
270int __pure cpu_architecture(void)
271{
272 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN);
273
274 return __cpu_architecture;
275}
276
277static int cpu_has_aliasing_icache(unsigned int arch)
278{
279 int aliasing_icache;
280 unsigned int id_reg, num_sets, line_size;
281
282 /* PIPT caches never alias. */
283 if (icache_is_pipt())
284 return 0;
285
286 /* arch specifies the register format */
287 switch (arch) {
288 case CPU_ARCH_ARMv7:
289 set_csselr(CSSELR_ICACHE | CSSELR_L1);
290 isb();
291 id_reg = read_ccsidr();
292 line_size = 4 << ((id_reg & 0x7) + 2);
293 num_sets = ((id_reg >> 13) & 0x7fff) + 1;
294 aliasing_icache = (line_size * num_sets) > PAGE_SIZE;
295 break;
296 case CPU_ARCH_ARMv6:
297 aliasing_icache = read_cpuid_cachetype() & (1 << 11);
298 break;
299 default:
300 /* I-cache aliases will be handled by D-cache aliasing code */
301 aliasing_icache = 0;
302 }
303
304 return aliasing_icache;
305}
306
307static void __init cacheid_init(void)
308{
309 unsigned int arch = cpu_architecture();
310
311 if (arch >= CPU_ARCH_ARMv6) {
312 unsigned int cachetype = read_cpuid_cachetype();
313
314 if ((arch == CPU_ARCH_ARMv7M) && !(cachetype & 0xf000f)) {
315 cacheid = 0;
316 } else if ((cachetype & (7 << 29)) == 4 << 29) {
317 /* ARMv7 register format */
318 arch = CPU_ARCH_ARMv7;
319 cacheid = CACHEID_VIPT_NONALIASING;
320 switch (cachetype & (3 << 14)) {
321 case (1 << 14):
322 cacheid |= CACHEID_ASID_TAGGED;
323 break;
324 case (3 << 14):
325 cacheid |= CACHEID_PIPT;
326 break;
327 }
328 } else {
329 arch = CPU_ARCH_ARMv6;
330 if (cachetype & (1 << 23))
331 cacheid = CACHEID_VIPT_ALIASING;
332 else
333 cacheid = CACHEID_VIPT_NONALIASING;
334 }
335 if (cpu_has_aliasing_icache(arch))
336 cacheid |= CACHEID_VIPT_I_ALIASING;
337 } else {
338 cacheid = CACHEID_VIVT;
339 }
340
341 pr_info("CPU: %s data cache, %s instruction cache\n",
342 cache_is_vivt() ? "VIVT" :
343 cache_is_vipt_aliasing() ? "VIPT aliasing" :
344 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown",
345 cache_is_vivt() ? "VIVT" :
346 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" :
347 icache_is_vipt_aliasing() ? "VIPT aliasing" :
348 icache_is_pipt() ? "PIPT" :
349 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown");
350}
351
352/*
353 * These functions re-use the assembly code in head.S, which
354 * already provide the required functionality.
355 */
356extern struct proc_info_list *lookup_processor_type(unsigned int);
357
358void __init early_print(const char *str, ...)
359{
360 extern void printascii(const char *);
361 char buf[256];
362 va_list ap;
363
364 va_start(ap, str);
365 vsnprintf(buf, sizeof(buf), str, ap);
366 va_end(ap);
367
368#ifdef CONFIG_DEBUG_LL
369 printascii(buf);
370#endif
371 printk("%s", buf);
372}
373
374#ifdef CONFIG_ARM_PATCH_IDIV
375
376static inline u32 __attribute_const__ sdiv_instruction(void)
377{
378 if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) {
379 /* "sdiv r0, r0, r1" */
380 u32 insn = __opcode_thumb32_compose(0xfb90, 0xf0f1);
381 return __opcode_to_mem_thumb32(insn);
382 }
383
384 /* "sdiv r0, r0, r1" */
385 return __opcode_to_mem_arm(0xe710f110);
386}
387
388static inline u32 __attribute_const__ udiv_instruction(void)
389{
390 if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) {
391 /* "udiv r0, r0, r1" */
392 u32 insn = __opcode_thumb32_compose(0xfbb0, 0xf0f1);
393 return __opcode_to_mem_thumb32(insn);
394 }
395
396 /* "udiv r0, r0, r1" */
397 return __opcode_to_mem_arm(0xe730f110);
398}
399
400static inline u32 __attribute_const__ bx_lr_instruction(void)
401{
402 if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) {
403 /* "bx lr; nop" */
404 u32 insn = __opcode_thumb32_compose(0x4770, 0x46c0);
405 return __opcode_to_mem_thumb32(insn);
406 }
407
408 /* "bx lr" */
409 return __opcode_to_mem_arm(0xe12fff1e);
410}
411
412static void __init patch_aeabi_idiv(void)
413{
414 extern void __aeabi_uidiv(void);
415 extern void __aeabi_idiv(void);
416 uintptr_t fn_addr;
417 unsigned int mask;
418
419 mask = IS_ENABLED(CONFIG_THUMB2_KERNEL) ? HWCAP_IDIVT : HWCAP_IDIVA;
420 if (!(elf_hwcap & mask))
421 return;
422
423 pr_info("CPU: div instructions available: patching division code\n");
424
425 fn_addr = ((uintptr_t)&__aeabi_uidiv) & ~1;
426 asm ("" : "+g" (fn_addr));
427 ((u32 *)fn_addr)[0] = udiv_instruction();
428 ((u32 *)fn_addr)[1] = bx_lr_instruction();
429 flush_icache_range(fn_addr, fn_addr + 8);
430
431 fn_addr = ((uintptr_t)&__aeabi_idiv) & ~1;
432 asm ("" : "+g" (fn_addr));
433 ((u32 *)fn_addr)[0] = sdiv_instruction();
434 ((u32 *)fn_addr)[1] = bx_lr_instruction();
435 flush_icache_range(fn_addr, fn_addr + 8);
436}
437
438#else
439static inline void patch_aeabi_idiv(void) { }
440#endif
441
442static void __init cpuid_init_hwcaps(void)
443{
444 int block;
445 u32 isar5;
446 u32 isar6;
447 u32 pfr2;
448
449 if (cpu_architecture() < CPU_ARCH_ARMv7)
450 return;
451
452 block = cpuid_feature_extract(CPUID_EXT_ISAR0, 24);
453 if (block >= 2)
454 elf_hwcap |= HWCAP_IDIVA;
455 if (block >= 1)
456 elf_hwcap |= HWCAP_IDIVT;
457
458 /* LPAE implies atomic ldrd/strd instructions */
459 block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0);
460 if (block >= 5)
461 elf_hwcap |= HWCAP_LPAE;
462
463 /* check for supported v8 Crypto instructions */
464 isar5 = read_cpuid_ext(CPUID_EXT_ISAR5);
465
466 block = cpuid_feature_extract_field(isar5, 4);
467 if (block >= 2)
468 elf_hwcap2 |= HWCAP2_PMULL;
469 if (block >= 1)
470 elf_hwcap2 |= HWCAP2_AES;
471
472 block = cpuid_feature_extract_field(isar5, 8);
473 if (block >= 1)
474 elf_hwcap2 |= HWCAP2_SHA1;
475
476 block = cpuid_feature_extract_field(isar5, 12);
477 if (block >= 1)
478 elf_hwcap2 |= HWCAP2_SHA2;
479
480 block = cpuid_feature_extract_field(isar5, 16);
481 if (block >= 1)
482 elf_hwcap2 |= HWCAP2_CRC32;
483
484 /* Check for Speculation barrier instruction */
485 isar6 = read_cpuid_ext(CPUID_EXT_ISAR6);
486 block = cpuid_feature_extract_field(isar6, 12);
487 if (block >= 1)
488 elf_hwcap2 |= HWCAP2_SB;
489
490 /* Check for Speculative Store Bypassing control */
491 pfr2 = read_cpuid_ext(CPUID_EXT_PFR2);
492 block = cpuid_feature_extract_field(pfr2, 4);
493 if (block >= 1)
494 elf_hwcap2 |= HWCAP2_SSBS;
495}
496
497static void __init elf_hwcap_fixup(void)
498{
499 unsigned id = read_cpuid_id();
500
501 /*
502 * HWCAP_TLS is available only on 1136 r1p0 and later,
503 * see also kuser_get_tls_init.
504 */
505 if (read_cpuid_part() == ARM_CPU_PART_ARM1136 &&
506 ((id >> 20) & 3) == 0) {
507 elf_hwcap &= ~HWCAP_TLS;
508 return;
509 }
510
511 /* Verify if CPUID scheme is implemented */
512 if ((id & 0x000f0000) != 0x000f0000)
513 return;
514
515 /*
516 * If the CPU supports LDREX/STREX and LDREXB/STREXB,
517 * avoid advertising SWP; it may not be atomic with
518 * multiprocessing cores.
519 */
520 if (cpuid_feature_extract(CPUID_EXT_ISAR3, 12) > 1 ||
521 (cpuid_feature_extract(CPUID_EXT_ISAR3, 12) == 1 &&
522 cpuid_feature_extract(CPUID_EXT_ISAR4, 20) >= 3))
523 elf_hwcap &= ~HWCAP_SWP;
524}
525
526/*
527 * cpu_init - initialise one CPU.
528 *
529 * cpu_init sets up the per-CPU stacks.
530 */
531void notrace cpu_init(void)
532{
533#ifndef CONFIG_CPU_V7M
534 unsigned int cpu = smp_processor_id();
535 struct stack *stk = &stacks[cpu];
536
537 if (cpu >= NR_CPUS) {
538 pr_crit("CPU%u: bad primary CPU number\n", cpu);
539 BUG();
540 }
541
542 /*
543 * This only works on resume and secondary cores. For booting on the
544 * boot cpu, smp_prepare_boot_cpu is called after percpu area setup.
545 */
546 set_my_cpu_offset(per_cpu_offset(cpu));
547
548 cpu_proc_init();
549
550 /*
551 * Define the placement constraint for the inline asm directive below.
552 * In Thumb-2, msr with an immediate value is not allowed.
553 */
554#ifdef CONFIG_THUMB2_KERNEL
555#define PLC_l "l"
556#define PLC_r "r"
557#else
558#define PLC_l "I"
559#define PLC_r "I"
560#endif
561
562 /*
563 * setup stacks for re-entrant exception handlers
564 */
565 __asm__ (
566 "msr cpsr_c, %1\n\t"
567 "add r14, %0, %2\n\t"
568 "mov sp, r14\n\t"
569 "msr cpsr_c, %3\n\t"
570 "add r14, %0, %4\n\t"
571 "mov sp, r14\n\t"
572 "msr cpsr_c, %5\n\t"
573 "add r14, %0, %6\n\t"
574 "mov sp, r14\n\t"
575 "msr cpsr_c, %7\n\t"
576 "add r14, %0, %8\n\t"
577 "mov sp, r14\n\t"
578 "msr cpsr_c, %9"
579 :
580 : "r" (stk),
581 PLC_r (PSR_F_BIT | PSR_I_BIT | IRQ_MODE),
582 "I" (offsetof(struct stack, irq[0])),
583 PLC_r (PSR_F_BIT | PSR_I_BIT | ABT_MODE),
584 "I" (offsetof(struct stack, abt[0])),
585 PLC_r (PSR_F_BIT | PSR_I_BIT | UND_MODE),
586 "I" (offsetof(struct stack, und[0])),
587 PLC_r (PSR_F_BIT | PSR_I_BIT | FIQ_MODE),
588 "I" (offsetof(struct stack, fiq[0])),
589 PLC_l (PSR_F_BIT | PSR_I_BIT | SVC_MODE)
590 : "r14");
591#endif
592}
593
594u32 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID };
595
596void __init smp_setup_processor_id(void)
597{
598 int i;
599 u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
600 u32 cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
601
602 cpu_logical_map(0) = cpu;
603 for (i = 1; i < nr_cpu_ids; ++i)
604 cpu_logical_map(i) = i == cpu ? 0 : i;
605
606 /*
607 * clear __my_cpu_offset on boot CPU to avoid hang caused by
608 * using percpu variable early, for example, lockdep will
609 * access percpu variable inside lock_release
610 */
611 set_my_cpu_offset(0);
612
613 pr_info("Booting Linux on physical CPU 0x%x\n", mpidr);
614}
615
616struct mpidr_hash mpidr_hash;
617#ifdef CONFIG_SMP
618/**
619 * smp_build_mpidr_hash - Pre-compute shifts required at each affinity
620 * level in order to build a linear index from an
621 * MPIDR value. Resulting algorithm is a collision
622 * free hash carried out through shifting and ORing
623 */
624static void __init smp_build_mpidr_hash(void)
625{
626 u32 i, affinity;
627 u32 fs[3], bits[3], ls, mask = 0;
628 /*
629 * Pre-scan the list of MPIDRS and filter out bits that do
630 * not contribute to affinity levels, ie they never toggle.
631 */
632 for_each_possible_cpu(i)
633 mask |= (cpu_logical_map(i) ^ cpu_logical_map(0));
634 pr_debug("mask of set bits 0x%x\n", mask);
635 /*
636 * Find and stash the last and first bit set at all affinity levels to
637 * check how many bits are required to represent them.
638 */
639 for (i = 0; i < 3; i++) {
640 affinity = MPIDR_AFFINITY_LEVEL(mask, i);
641 /*
642 * Find the MSB bit and LSB bits position
643 * to determine how many bits are required
644 * to express the affinity level.
645 */
646 ls = fls(affinity);
647 fs[i] = affinity ? ffs(affinity) - 1 : 0;
648 bits[i] = ls - fs[i];
649 }
650 /*
651 * An index can be created from the MPIDR by isolating the
652 * significant bits at each affinity level and by shifting
653 * them in order to compress the 24 bits values space to a
654 * compressed set of values. This is equivalent to hashing
655 * the MPIDR through shifting and ORing. It is a collision free
656 * hash though not minimal since some levels might contain a number
657 * of CPUs that is not an exact power of 2 and their bit
658 * representation might contain holes, eg MPIDR[7:0] = {0x2, 0x80}.
659 */
660 mpidr_hash.shift_aff[0] = fs[0];
661 mpidr_hash.shift_aff[1] = MPIDR_LEVEL_BITS + fs[1] - bits[0];
662 mpidr_hash.shift_aff[2] = 2*MPIDR_LEVEL_BITS + fs[2] -
663 (bits[1] + bits[0]);
664 mpidr_hash.mask = mask;
665 mpidr_hash.bits = bits[2] + bits[1] + bits[0];
666 pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] mask[0x%x] bits[%u]\n",
667 mpidr_hash.shift_aff[0],
668 mpidr_hash.shift_aff[1],
669 mpidr_hash.shift_aff[2],
670 mpidr_hash.mask,
671 mpidr_hash.bits);
672 /*
673 * 4x is an arbitrary value used to warn on a hash table much bigger
674 * than expected on most systems.
675 */
676 if (mpidr_hash_size() > 4 * num_possible_cpus())
677 pr_warn("Large number of MPIDR hash buckets detected\n");
678 sync_cache_w(&mpidr_hash);
679}
680#endif
681
682/*
683 * locate processor in the list of supported processor types. The linker
684 * builds this table for us from the entries in arch/arm/mm/proc-*.S
685 */
686struct proc_info_list *lookup_processor(u32 midr)
687{
688 struct proc_info_list *list = lookup_processor_type(midr);
689
690 if (!list) {
691 pr_err("CPU%u: configuration botched (ID %08x), CPU halted\n",
692 smp_processor_id(), midr);
693 while (1)
694 /* can't use cpu_relax() here as it may require MMU setup */;
695 }
696
697 return list;
698}
699
700static void __init setup_processor(void)
701{
702 unsigned int midr = read_cpuid_id();
703 struct proc_info_list *list = lookup_processor(midr);
704
705 cpu_name = list->cpu_name;
706 __cpu_architecture = __get_cpu_architecture();
707
708 init_proc_vtable(list->proc);
709#ifdef MULTI_TLB
710 cpu_tlb = *list->tlb;
711#endif
712#ifdef MULTI_USER
713 cpu_user = *list->user;
714#endif
715#ifdef MULTI_CACHE
716 cpu_cache = *list->cache;
717#endif
718
719 pr_info("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n",
720 list->cpu_name, midr, midr & 15,
721 proc_arch[cpu_architecture()], get_cr());
722
723 snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c",
724 list->arch_name, ENDIANNESS);
725 snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c",
726 list->elf_name, ENDIANNESS);
727 elf_hwcap = list->elf_hwcap;
728
729 cpuid_init_hwcaps();
730 patch_aeabi_idiv();
731
732#ifndef CONFIG_ARM_THUMB
733 elf_hwcap &= ~(HWCAP_THUMB | HWCAP_IDIVT);
734#endif
735#ifdef CONFIG_MMU
736 init_default_cache_policy(list->__cpu_mm_mmu_flags);
737#endif
738 erratum_a15_798181_init();
739
740 elf_hwcap_fixup();
741
742 cacheid_init();
743 cpu_init();
744}
745
746void __init dump_machine_table(void)
747{
748 const struct machine_desc *p;
749
750 early_print("Available machine support:\n\nID (hex)\tNAME\n");
751 for_each_machine_desc(p)
752 early_print("%08x\t%s\n", p->nr, p->name);
753
754 early_print("\nPlease check your kernel config and/or bootloader.\n");
755
756 while (true)
757 /* can't use cpu_relax() here as it may require MMU setup */;
758}
759
760int __init arm_add_memory(u64 start, u64 size)
761{
762 u64 aligned_start;
763
764 /*
765 * Ensure that start/size are aligned to a page boundary.
766 * Size is rounded down, start is rounded up.
767 */
768 aligned_start = PAGE_ALIGN(start);
769 if (aligned_start > start + size)
770 size = 0;
771 else
772 size -= aligned_start - start;
773
774#ifndef CONFIG_PHYS_ADDR_T_64BIT
775 if (aligned_start > ULONG_MAX) {
776 pr_crit("Ignoring memory at 0x%08llx outside 32-bit physical address space\n",
777 start);
778 return -EINVAL;
779 }
780
781 if (aligned_start + size > ULONG_MAX) {
782 pr_crit("Truncating memory at 0x%08llx to fit in 32-bit physical address space\n",
783 (long long)start);
784 /*
785 * To ensure bank->start + bank->size is representable in
786 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB.
787 * This means we lose a page after masking.
788 */
789 size = ULONG_MAX - aligned_start;
790 }
791#endif
792
793 if (aligned_start < PHYS_OFFSET) {
794 if (aligned_start + size <= PHYS_OFFSET) {
795 pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n",
796 aligned_start, aligned_start + size);
797 return -EINVAL;
798 }
799
800 pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n",
801 aligned_start, (u64)PHYS_OFFSET);
802
803 size -= PHYS_OFFSET - aligned_start;
804 aligned_start = PHYS_OFFSET;
805 }
806
807 start = aligned_start;
808 size = size & ~(phys_addr_t)(PAGE_SIZE - 1);
809
810 /*
811 * Check whether this memory region has non-zero size or
812 * invalid node number.
813 */
814 if (size == 0)
815 return -EINVAL;
816
817 memblock_add(start, size);
818 return 0;
819}
820
821/*
822 * Pick out the memory size. We look for mem=size@start,
823 * where start and size are "size[KkMm]"
824 */
825
826static int __init early_mem(char *p)
827{
828 static int usermem __initdata = 0;
829 u64 size;
830 u64 start;
831 char *endp;
832
833 /*
834 * If the user specifies memory size, we
835 * blow away any automatically generated
836 * size.
837 */
838 if (usermem == 0) {
839 usermem = 1;
840 memblock_remove(memblock_start_of_DRAM(),
841 memblock_end_of_DRAM() - memblock_start_of_DRAM());
842 }
843
844 start = PHYS_OFFSET;
845 size = memparse(p, &endp);
846 if (*endp == '@')
847 start = memparse(endp + 1, NULL);
848
849 arm_add_memory(start, size);
850
851 return 0;
852}
853early_param("mem", early_mem);
854
855static void __init request_standard_resources(const struct machine_desc *mdesc)
856{
857 phys_addr_t start, end, res_end;
858 struct resource *res;
859 u64 i;
860
861 kernel_code.start = virt_to_phys(_text);
862 kernel_code.end = virt_to_phys(__init_begin - 1);
863 kernel_data.start = virt_to_phys(_sdata);
864 kernel_data.end = virt_to_phys(_end - 1);
865
866 for_each_mem_range(i, &start, &end) {
867 unsigned long boot_alias_start;
868
869 /*
870 * In memblock, end points to the first byte after the
871 * range while in resourses, end points to the last byte in
872 * the range.
873 */
874 res_end = end - 1;
875
876 /*
877 * Some systems have a special memory alias which is only
878 * used for booting. We need to advertise this region to
879 * kexec-tools so they know where bootable RAM is located.
880 */
881 boot_alias_start = phys_to_idmap(start);
882 if (arm_has_idmap_alias() && boot_alias_start != IDMAP_INVALID_ADDR) {
883 res = memblock_alloc_or_panic(sizeof(*res), SMP_CACHE_BYTES);
884 res->name = "System RAM (boot alias)";
885 res->start = boot_alias_start;
886 res->end = phys_to_idmap(res_end);
887 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
888 request_resource(&iomem_resource, res);
889 }
890
891 res = memblock_alloc_or_panic(sizeof(*res), SMP_CACHE_BYTES);
892 res->name = "System RAM";
893 res->start = start;
894 res->end = res_end;
895 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY;
896
897 request_resource(&iomem_resource, res);
898
899 if (kernel_code.start >= res->start &&
900 kernel_code.end <= res->end)
901 request_resource(res, &kernel_code);
902 if (kernel_data.start >= res->start &&
903 kernel_data.end <= res->end)
904 request_resource(res, &kernel_data);
905 }
906
907 if (mdesc->video_start) {
908 video_ram.start = mdesc->video_start;
909 video_ram.end = mdesc->video_end;
910 request_resource(&iomem_resource, &video_ram);
911 }
912
913 /*
914 * Some machines don't have the possibility of ever
915 * possessing lp0, lp1 or lp2
916 */
917 if (mdesc->reserve_lp0)
918 request_resource(&ioport_resource, &lp0);
919 if (mdesc->reserve_lp1)
920 request_resource(&ioport_resource, &lp1);
921 if (mdesc->reserve_lp2)
922 request_resource(&ioport_resource, &lp2);
923}
924
925#if defined(CONFIG_VGA_CONSOLE)
926struct screen_info vgacon_screen_info = {
927 .orig_video_lines = 30,
928 .orig_video_cols = 80,
929 .orig_video_mode = 0,
930 .orig_video_ega_bx = 0,
931 .orig_video_isVGA = 1,
932 .orig_video_points = 8
933};
934#endif
935
936static int __init customize_machine(void)
937{
938 /*
939 * customizes platform devices, or adds new ones
940 * On DT based machines, we fall back to populating the
941 * machine from the device tree, if no callback is provided,
942 * otherwise we would always need an init_machine callback.
943 */
944 if (machine_desc->init_machine)
945 machine_desc->init_machine();
946
947 return 0;
948}
949arch_initcall(customize_machine);
950
951static int __init init_machine_late(void)
952{
953 struct device_node *root;
954 int ret;
955
956 if (machine_desc->init_late)
957 machine_desc->init_late();
958
959 root = of_find_node_by_path("/");
960 if (root) {
961 ret = of_property_read_string(root, "serial-number",
962 &system_serial);
963 if (ret)
964 system_serial = NULL;
965 }
966
967 if (!system_serial)
968 system_serial = kasprintf(GFP_KERNEL, "%08x%08x",
969 system_serial_high,
970 system_serial_low);
971
972 return 0;
973}
974late_initcall(init_machine_late);
975
976#ifdef CONFIG_CRASH_RESERVE
977/*
978 * The crash region must be aligned to 128MB to avoid
979 * zImage relocating below the reserved region.
980 */
981#define CRASH_ALIGN (128 << 20)
982
983static inline unsigned long long get_total_mem(void)
984{
985 unsigned long total;
986
987 total = max_low_pfn - min_low_pfn;
988 return total << PAGE_SHIFT;
989}
990
991/**
992 * reserve_crashkernel() - reserves memory are for crash kernel
993 *
994 * This function reserves memory area given in "crashkernel=" kernel command
995 * line parameter. The memory reserved is used by a dump capture kernel when
996 * primary kernel is crashing.
997 */
998static void __init reserve_crashkernel(void)
999{
1000 unsigned long long crash_size, crash_base;
1001 unsigned long long total_mem;
1002 int ret;
1003
1004 total_mem = get_total_mem();
1005 ret = parse_crashkernel(boot_command_line, total_mem,
1006 &crash_size, &crash_base,
1007 NULL, NULL, NULL);
1008 /* invalid value specified or crashkernel=0 */
1009 if (ret || !crash_size)
1010 return;
1011
1012 if (crash_base <= 0) {
1013 unsigned long long crash_max = idmap_to_phys((u32)~0);
1014 unsigned long long lowmem_max = __pa(high_memory - 1) + 1;
1015 if (crash_max > lowmem_max)
1016 crash_max = lowmem_max;
1017
1018 crash_base = memblock_phys_alloc_range(crash_size, CRASH_ALIGN,
1019 CRASH_ALIGN, crash_max);
1020 if (!crash_base) {
1021 pr_err("crashkernel reservation failed - No suitable area found.\n");
1022 return;
1023 }
1024 } else {
1025 unsigned long long crash_max = crash_base + crash_size;
1026 unsigned long long start;
1027
1028 start = memblock_phys_alloc_range(crash_size, SECTION_SIZE,
1029 crash_base, crash_max);
1030 if (!start) {
1031 pr_err("crashkernel reservation failed - memory is in use.\n");
1032 return;
1033 }
1034 }
1035
1036 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n",
1037 (unsigned long)(crash_size >> 20),
1038 (unsigned long)(crash_base >> 20),
1039 (unsigned long)(total_mem >> 20));
1040
1041 /* The crashk resource must always be located in normal mem */
1042 crashk_res.start = crash_base;
1043 crashk_res.end = crash_base + crash_size - 1;
1044 insert_resource(&iomem_resource, &crashk_res);
1045
1046 if (arm_has_idmap_alias()) {
1047 /*
1048 * If we have a special RAM alias for use at boot, we
1049 * need to advertise to kexec tools where the alias is.
1050 */
1051 static struct resource crashk_boot_res = {
1052 .name = "Crash kernel (boot alias)",
1053 .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
1054 };
1055
1056 crashk_boot_res.start = phys_to_idmap(crash_base);
1057 crashk_boot_res.end = crashk_boot_res.start + crash_size - 1;
1058 insert_resource(&iomem_resource, &crashk_boot_res);
1059 }
1060}
1061#else
1062static inline void reserve_crashkernel(void) {}
1063#endif /* CONFIG_CRASH_RESERVE*/
1064
1065void __init hyp_mode_check(void)
1066{
1067#ifdef CONFIG_ARM_VIRT_EXT
1068 sync_boot_mode();
1069
1070 if (is_hyp_mode_available()) {
1071 pr_info("CPU: All CPU(s) started in HYP mode.\n");
1072 pr_info("CPU: Virtualization extensions available.\n");
1073 } else if (is_hyp_mode_mismatched()) {
1074 pr_warn("CPU: WARNING: CPU(s) started in wrong/inconsistent modes (primary CPU mode 0x%x)\n",
1075 __boot_cpu_mode & MODE_MASK);
1076 pr_warn("CPU: This may indicate a broken bootloader or firmware.\n");
1077 } else
1078 pr_info("CPU: All CPU(s) started in SVC mode.\n");
1079#endif
1080}
1081
1082static void (*__arm_pm_restart)(enum reboot_mode reboot_mode, const char *cmd);
1083
1084static int arm_restart(struct notifier_block *nb, unsigned long action,
1085 void *data)
1086{
1087 __arm_pm_restart(action, data);
1088 return NOTIFY_DONE;
1089}
1090
1091static struct notifier_block arm_restart_nb = {
1092 .notifier_call = arm_restart,
1093 .priority = 128,
1094};
1095
1096void __init setup_arch(char **cmdline_p)
1097{
1098 const struct machine_desc *mdesc = NULL;
1099 void *atags_vaddr = NULL;
1100
1101 if (__atags_pointer)
1102 atags_vaddr = FDT_VIRT_BASE(__atags_pointer);
1103
1104 setup_processor();
1105 if (atags_vaddr) {
1106 mdesc = setup_machine_fdt(atags_vaddr);
1107 if (mdesc)
1108 memblock_reserve(__atags_pointer,
1109 fdt_totalsize(atags_vaddr));
1110 }
1111 if (!mdesc)
1112 mdesc = setup_machine_tags(atags_vaddr, __machine_arch_type);
1113 if (!mdesc) {
1114 early_print("\nError: invalid dtb and unrecognized/unsupported machine ID\n");
1115 early_print(" r1=0x%08x, r2=0x%08x\n", __machine_arch_type,
1116 __atags_pointer);
1117 if (__atags_pointer)
1118 early_print(" r2[]=%*ph\n", 16, atags_vaddr);
1119 dump_machine_table();
1120 }
1121
1122 machine_desc = mdesc;
1123 machine_name = mdesc->name;
1124 dump_stack_set_arch_desc("%s", mdesc->name);
1125
1126 if (mdesc->reboot_mode != REBOOT_HARD)
1127 reboot_mode = mdesc->reboot_mode;
1128
1129 setup_initial_init_mm(_text, _etext, _edata, _end);
1130
1131 /* populate cmd_line too for later use, preserving boot_command_line */
1132 strscpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE);
1133 *cmdline_p = cmd_line;
1134
1135 early_fixmap_init();
1136 early_ioremap_init();
1137
1138 parse_early_param();
1139
1140#ifdef CONFIG_MMU
1141 early_mm_init(mdesc);
1142#endif
1143 setup_dma_zone(mdesc);
1144 xen_early_init();
1145 arm_efi_init();
1146 /*
1147 * Make sure the calculation for lowmem/highmem is set appropriately
1148 * before reserving/allocating any memory
1149 */
1150 adjust_lowmem_bounds();
1151 arm_memblock_init(mdesc);
1152 /* Memory may have been removed so recalculate the bounds. */
1153 adjust_lowmem_bounds();
1154
1155 early_ioremap_reset();
1156
1157 paging_init(mdesc);
1158 kasan_init();
1159 request_standard_resources(mdesc);
1160
1161 if (mdesc->restart) {
1162 __arm_pm_restart = mdesc->restart;
1163 register_restart_handler(&arm_restart_nb);
1164 }
1165
1166 unflatten_device_tree();
1167
1168 arm_dt_init_cpu_maps();
1169 psci_dt_init();
1170#ifdef CONFIG_SMP
1171 if (is_smp()) {
1172 if (!mdesc->smp_init || !mdesc->smp_init()) {
1173 if (psci_smp_available())
1174 smp_set_ops(&psci_smp_ops);
1175 else if (mdesc->smp)
1176 smp_set_ops(mdesc->smp);
1177 }
1178 smp_init_cpus();
1179 smp_build_mpidr_hash();
1180 }
1181#endif
1182
1183 if (!is_smp())
1184 hyp_mode_check();
1185
1186 reserve_crashkernel();
1187
1188#ifdef CONFIG_VT
1189#if defined(CONFIG_VGA_CONSOLE)
1190 vgacon_register_screen(&vgacon_screen_info);
1191#endif
1192#endif
1193
1194 if (mdesc->init_early)
1195 mdesc->init_early();
1196}
1197
1198bool arch_cpu_is_hotpluggable(int num)
1199{
1200 return platform_can_hotplug_cpu(num);
1201}
1202
1203#ifdef CONFIG_HAVE_PROC_CPU
1204static int __init proc_cpu_init(void)
1205{
1206 struct proc_dir_entry *res;
1207
1208 res = proc_mkdir("cpu", NULL);
1209 if (!res)
1210 return -ENOMEM;
1211 return 0;
1212}
1213fs_initcall(proc_cpu_init);
1214#endif
1215
1216static const char *hwcap_str[] = {
1217 "swp",
1218 "half",
1219 "thumb",
1220 "26bit",
1221 "fastmult",
1222 "fpa",
1223 "vfp",
1224 "edsp",
1225 "java",
1226 "iwmmxt",
1227 "crunch",
1228 "thumbee",
1229 "neon",
1230 "vfpv3",
1231 "vfpv3d16",
1232 "tls",
1233 "vfpv4",
1234 "idiva",
1235 "idivt",
1236 "vfpd32",
1237 "lpae",
1238 "evtstrm",
1239 "fphp",
1240 "asimdhp",
1241 "asimddp",
1242 "asimdfhm",
1243 "asimdbf16",
1244 "i8mm",
1245 NULL
1246};
1247
1248static const char *hwcap2_str[] = {
1249 "aes",
1250 "pmull",
1251 "sha1",
1252 "sha2",
1253 "crc32",
1254 "sb",
1255 "ssbs",
1256 NULL
1257};
1258
1259static int c_show(struct seq_file *m, void *v)
1260{
1261 int i, j;
1262 u32 cpuid;
1263
1264 for_each_online_cpu(i) {
1265 /*
1266 * glibc reads /proc/cpuinfo to determine the number of
1267 * online processors, looking for lines beginning with
1268 * "processor". Give glibc what it expects.
1269 */
1270 seq_printf(m, "processor\t: %d\n", i);
1271 cpuid = is_smp() ? per_cpu(cpu_data, i).cpuid : read_cpuid_id();
1272 seq_printf(m, "model name\t: %s rev %d (%s)\n",
1273 cpu_name, cpuid & 15, elf_platform);
1274
1275#if defined(CONFIG_SMP)
1276 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1277 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ),
1278 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100);
1279#else
1280 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n",
1281 loops_per_jiffy / (500000/HZ),
1282 (loops_per_jiffy / (5000/HZ)) % 100);
1283#endif
1284 /* dump out the processor features */
1285 seq_puts(m, "Features\t: ");
1286
1287 for (j = 0; hwcap_str[j]; j++)
1288 if (elf_hwcap & (1 << j))
1289 seq_printf(m, "%s ", hwcap_str[j]);
1290
1291 for (j = 0; hwcap2_str[j]; j++)
1292 if (elf_hwcap2 & (1 << j))
1293 seq_printf(m, "%s ", hwcap2_str[j]);
1294
1295 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", cpuid >> 24);
1296 seq_printf(m, "CPU architecture: %s\n",
1297 proc_arch[cpu_architecture()]);
1298
1299 if ((cpuid & 0x0008f000) == 0x00000000) {
1300 /* pre-ARM7 */
1301 seq_printf(m, "CPU part\t: %07x\n", cpuid >> 4);
1302 } else {
1303 if ((cpuid & 0x0008f000) == 0x00007000) {
1304 /* ARM7 */
1305 seq_printf(m, "CPU variant\t: 0x%02x\n",
1306 (cpuid >> 16) & 127);
1307 } else {
1308 /* post-ARM7 */
1309 seq_printf(m, "CPU variant\t: 0x%x\n",
1310 (cpuid >> 20) & 15);
1311 }
1312 seq_printf(m, "CPU part\t: 0x%03x\n",
1313 (cpuid >> 4) & 0xfff);
1314 }
1315 seq_printf(m, "CPU revision\t: %d\n\n", cpuid & 15);
1316 }
1317
1318 seq_printf(m, "Hardware\t: %s\n", machine_name);
1319 seq_printf(m, "Revision\t: %04x\n", system_rev);
1320 seq_printf(m, "Serial\t\t: %s\n", system_serial);
1321
1322 return 0;
1323}
1324
1325static void *c_start(struct seq_file *m, loff_t *pos)
1326{
1327 return *pos < 1 ? (void *)1 : NULL;
1328}
1329
1330static void *c_next(struct seq_file *m, void *v, loff_t *pos)
1331{
1332 ++*pos;
1333 return NULL;
1334}
1335
1336static void c_stop(struct seq_file *m, void *v)
1337{
1338}
1339
1340const struct seq_operations cpuinfo_op = {
1341 .start = c_start,
1342 .next = c_next,
1343 .stop = c_stop,
1344 .show = c_show
1345};