1 /* 2 * linux/arch/arm/kernel/setup.c 3 * 4 * Copyright (C) 1995-2001 Russell King 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License version 2 as 8 * published by the Free Software Foundation. 9 */ 10 #include <linux/efi.h> 11 #include <linux/export.h> 12 #include <linux/kernel.h> 13 #include <linux/stddef.h> 14 #include <linux/ioport.h> 15 #include <linux/delay.h> 16 #include <linux/utsname.h> 17 #include <linux/initrd.h> 18 #include <linux/console.h> 19 #include <linux/bootmem.h> 20 #include <linux/seq_file.h> 21 #include <linux/screen_info.h> 22 #include <linux/of_platform.h> 23 #include <linux/init.h> 24 #include <linux/kexec.h> 25 #include <linux/of_fdt.h> 26 #include <linux/cpu.h> 27 #include <linux/interrupt.h> 28 #include <linux/smp.h> 29 #include <linux/proc_fs.h> 30 #include <linux/memblock.h> 31 #include <linux/bug.h> 32 #include <linux/compiler.h> 33 #include <linux/sort.h> 34 #include <linux/psci.h> 35 36 #include <asm/unified.h> 37 #include <asm/cp15.h> 38 #include <asm/cpu.h> 39 #include <asm/cputype.h> 40 #include <asm/efi.h> 41 #include <asm/elf.h> 42 #include <asm/early_ioremap.h> 43 #include <asm/fixmap.h> 44 #include <asm/procinfo.h> 45 #include <asm/psci.h> 46 #include <asm/sections.h> 47 #include <asm/setup.h> 48 #include <asm/smp_plat.h> 49 #include <asm/mach-types.h> 50 #include <asm/cacheflush.h> 51 #include <asm/cachetype.h> 52 #include <asm/tlbflush.h> 53 #include <asm/xen/hypervisor.h> 54 55 #include <asm/prom.h> 56 #include <asm/mach/arch.h> 57 #include <asm/mach/irq.h> 58 #include <asm/mach/time.h> 59 #include <asm/system_info.h> 60 #include <asm/system_misc.h> 61 #include <asm/traps.h> 62 #include <asm/unwind.h> 63 #include <asm/memblock.h> 64 #include <asm/virt.h> 65 66 #include "atags.h" 67 68 69 #if defined(CONFIG_FPE_NWFPE) || defined(CONFIG_FPE_FASTFPE) 70 char fpe_type[8]; 71 72 static int __init fpe_setup(char *line) 73 { 74 memcpy(fpe_type, line, 8); 75 return 1; 76 } 77 78 __setup("fpe=", fpe_setup); 79 #endif 80 81 extern void init_default_cache_policy(unsigned long); 82 extern void paging_init(const struct machine_desc *desc); 83 extern void early_mm_init(const struct machine_desc *); 84 extern void adjust_lowmem_bounds(void); 85 extern enum reboot_mode reboot_mode; 86 extern void setup_dma_zone(const struct machine_desc *desc); 87 88 unsigned int processor_id; 89 EXPORT_SYMBOL(processor_id); 90 unsigned int __machine_arch_type __read_mostly; 91 EXPORT_SYMBOL(__machine_arch_type); 92 unsigned int cacheid __read_mostly; 93 EXPORT_SYMBOL(cacheid); 94 95 unsigned int __atags_pointer __initdata; 96 97 unsigned int system_rev; 98 EXPORT_SYMBOL(system_rev); 99 100 const char *system_serial; 101 EXPORT_SYMBOL(system_serial); 102 103 unsigned int system_serial_low; 104 EXPORT_SYMBOL(system_serial_low); 105 106 unsigned int system_serial_high; 107 EXPORT_SYMBOL(system_serial_high); 108 109 unsigned int elf_hwcap __read_mostly; 110 EXPORT_SYMBOL(elf_hwcap); 111 112 unsigned int elf_hwcap2 __read_mostly; 113 EXPORT_SYMBOL(elf_hwcap2); 114 115 116 #ifdef MULTI_CPU 117 struct processor processor __ro_after_init; 118 #endif 119 #ifdef MULTI_TLB 120 struct cpu_tlb_fns cpu_tlb __ro_after_init; 121 #endif 122 #ifdef MULTI_USER 123 struct cpu_user_fns cpu_user __ro_after_init; 124 #endif 125 #ifdef MULTI_CACHE 126 struct cpu_cache_fns cpu_cache __ro_after_init; 127 #endif 128 #ifdef CONFIG_OUTER_CACHE 129 struct outer_cache_fns outer_cache __ro_after_init; 130 EXPORT_SYMBOL(outer_cache); 131 #endif 132 133 /* 134 * Cached cpu_architecture() result for use by assembler code. 135 * C code should use the cpu_architecture() function instead of accessing this 136 * variable directly. 137 */ 138 int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN; 139 140 struct stack { 141 u32 irq[3]; 142 u32 abt[3]; 143 u32 und[3]; 144 u32 fiq[3]; 145 } ____cacheline_aligned; 146 147 #ifndef CONFIG_CPU_V7M 148 static struct stack stacks[NR_CPUS]; 149 #endif 150 151 char elf_platform[ELF_PLATFORM_SIZE]; 152 EXPORT_SYMBOL(elf_platform); 153 154 static const char *cpu_name; 155 static const char *machine_name; 156 static char __initdata cmd_line[COMMAND_LINE_SIZE]; 157 const struct machine_desc *machine_desc __initdata; 158 159 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } }; 160 #define ENDIANNESS ((char)endian_test.l) 161 162 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data); 163 164 /* 165 * Standard memory resources 166 */ 167 static struct resource mem_res[] = { 168 { 169 .name = "Video RAM", 170 .start = 0, 171 .end = 0, 172 .flags = IORESOURCE_MEM 173 }, 174 { 175 .name = "Kernel code", 176 .start = 0, 177 .end = 0, 178 .flags = IORESOURCE_SYSTEM_RAM 179 }, 180 { 181 .name = "Kernel data", 182 .start = 0, 183 .end = 0, 184 .flags = IORESOURCE_SYSTEM_RAM 185 } 186 }; 187 188 #define video_ram mem_res[0] 189 #define kernel_code mem_res[1] 190 #define kernel_data mem_res[2] 191 192 static struct resource io_res[] = { 193 { 194 .name = "reserved", 195 .start = 0x3bc, 196 .end = 0x3be, 197 .flags = IORESOURCE_IO | IORESOURCE_BUSY 198 }, 199 { 200 .name = "reserved", 201 .start = 0x378, 202 .end = 0x37f, 203 .flags = IORESOURCE_IO | IORESOURCE_BUSY 204 }, 205 { 206 .name = "reserved", 207 .start = 0x278, 208 .end = 0x27f, 209 .flags = IORESOURCE_IO | IORESOURCE_BUSY 210 } 211 }; 212 213 #define lp0 io_res[0] 214 #define lp1 io_res[1] 215 #define lp2 io_res[2] 216 217 static const char *proc_arch[] = { 218 "undefined/unknown", 219 "3", 220 "4", 221 "4T", 222 "5", 223 "5T", 224 "5TE", 225 "5TEJ", 226 "6TEJ", 227 "7", 228 "7M", 229 "?(12)", 230 "?(13)", 231 "?(14)", 232 "?(15)", 233 "?(16)", 234 "?(17)", 235 }; 236 237 #ifdef CONFIG_CPU_V7M 238 static int __get_cpu_architecture(void) 239 { 240 return CPU_ARCH_ARMv7M; 241 } 242 #else 243 static int __get_cpu_architecture(void) 244 { 245 int cpu_arch; 246 247 if ((read_cpuid_id() & 0x0008f000) == 0) { 248 cpu_arch = CPU_ARCH_UNKNOWN; 249 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) { 250 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3; 251 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) { 252 cpu_arch = (read_cpuid_id() >> 16) & 7; 253 if (cpu_arch) 254 cpu_arch += CPU_ARCH_ARMv3; 255 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) { 256 /* Revised CPUID format. Read the Memory Model Feature 257 * Register 0 and check for VMSAv7 or PMSAv7 */ 258 unsigned int mmfr0 = read_cpuid_ext(CPUID_EXT_MMFR0); 259 if ((mmfr0 & 0x0000000f) >= 0x00000003 || 260 (mmfr0 & 0x000000f0) >= 0x00000030) 261 cpu_arch = CPU_ARCH_ARMv7; 262 else if ((mmfr0 & 0x0000000f) == 0x00000002 || 263 (mmfr0 & 0x000000f0) == 0x00000020) 264 cpu_arch = CPU_ARCH_ARMv6; 265 else 266 cpu_arch = CPU_ARCH_UNKNOWN; 267 } else 268 cpu_arch = CPU_ARCH_UNKNOWN; 269 270 return cpu_arch; 271 } 272 #endif 273 274 int __pure cpu_architecture(void) 275 { 276 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN); 277 278 return __cpu_architecture; 279 } 280 281 static int cpu_has_aliasing_icache(unsigned int arch) 282 { 283 int aliasing_icache; 284 unsigned int id_reg, num_sets, line_size; 285 286 /* PIPT caches never alias. */ 287 if (icache_is_pipt()) 288 return 0; 289 290 /* arch specifies the register format */ 291 switch (arch) { 292 case CPU_ARCH_ARMv7: 293 set_csselr(CSSELR_ICACHE | CSSELR_L1); 294 isb(); 295 id_reg = read_ccsidr(); 296 line_size = 4 << ((id_reg & 0x7) + 2); 297 num_sets = ((id_reg >> 13) & 0x7fff) + 1; 298 aliasing_icache = (line_size * num_sets) > PAGE_SIZE; 299 break; 300 case CPU_ARCH_ARMv6: 301 aliasing_icache = read_cpuid_cachetype() & (1 << 11); 302 break; 303 default: 304 /* I-cache aliases will be handled by D-cache aliasing code */ 305 aliasing_icache = 0; 306 } 307 308 return aliasing_icache; 309 } 310 311 static void __init cacheid_init(void) 312 { 313 unsigned int arch = cpu_architecture(); 314 315 if (arch >= CPU_ARCH_ARMv6) { 316 unsigned int cachetype = read_cpuid_cachetype(); 317 318 if ((arch == CPU_ARCH_ARMv7M) && !(cachetype & 0xf000f)) { 319 cacheid = 0; 320 } else if ((cachetype & (7 << 29)) == 4 << 29) { 321 /* ARMv7 register format */ 322 arch = CPU_ARCH_ARMv7; 323 cacheid = CACHEID_VIPT_NONALIASING; 324 switch (cachetype & (3 << 14)) { 325 case (1 << 14): 326 cacheid |= CACHEID_ASID_TAGGED; 327 break; 328 case (3 << 14): 329 cacheid |= CACHEID_PIPT; 330 break; 331 } 332 } else { 333 arch = CPU_ARCH_ARMv6; 334 if (cachetype & (1 << 23)) 335 cacheid = CACHEID_VIPT_ALIASING; 336 else 337 cacheid = CACHEID_VIPT_NONALIASING; 338 } 339 if (cpu_has_aliasing_icache(arch)) 340 cacheid |= CACHEID_VIPT_I_ALIASING; 341 } else { 342 cacheid = CACHEID_VIVT; 343 } 344 345 pr_info("CPU: %s data cache, %s instruction cache\n", 346 cache_is_vivt() ? "VIVT" : 347 cache_is_vipt_aliasing() ? "VIPT aliasing" : 348 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown", 349 cache_is_vivt() ? "VIVT" : 350 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" : 351 icache_is_vipt_aliasing() ? "VIPT aliasing" : 352 icache_is_pipt() ? "PIPT" : 353 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown"); 354 } 355 356 /* 357 * These functions re-use the assembly code in head.S, which 358 * already provide the required functionality. 359 */ 360 extern struct proc_info_list *lookup_processor_type(unsigned int); 361 362 void __init early_print(const char *str, ...) 363 { 364 extern void printascii(const char *); 365 char buf[256]; 366 va_list ap; 367 368 va_start(ap, str); 369 vsnprintf(buf, sizeof(buf), str, ap); 370 va_end(ap); 371 372 #ifdef CONFIG_DEBUG_LL 373 printascii(buf); 374 #endif 375 printk("%s", buf); 376 } 377 378 #ifdef CONFIG_ARM_PATCH_IDIV 379 380 static inline u32 __attribute_const__ sdiv_instruction(void) 381 { 382 if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) { 383 /* "sdiv r0, r0, r1" */ 384 u32 insn = __opcode_thumb32_compose(0xfb90, 0xf0f1); 385 return __opcode_to_mem_thumb32(insn); 386 } 387 388 /* "sdiv r0, r0, r1" */ 389 return __opcode_to_mem_arm(0xe710f110); 390 } 391 392 static inline u32 __attribute_const__ udiv_instruction(void) 393 { 394 if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) { 395 /* "udiv r0, r0, r1" */ 396 u32 insn = __opcode_thumb32_compose(0xfbb0, 0xf0f1); 397 return __opcode_to_mem_thumb32(insn); 398 } 399 400 /* "udiv r0, r0, r1" */ 401 return __opcode_to_mem_arm(0xe730f110); 402 } 403 404 static inline u32 __attribute_const__ bx_lr_instruction(void) 405 { 406 if (IS_ENABLED(CONFIG_THUMB2_KERNEL)) { 407 /* "bx lr; nop" */ 408 u32 insn = __opcode_thumb32_compose(0x4770, 0x46c0); 409 return __opcode_to_mem_thumb32(insn); 410 } 411 412 /* "bx lr" */ 413 return __opcode_to_mem_arm(0xe12fff1e); 414 } 415 416 static void __init patch_aeabi_idiv(void) 417 { 418 extern void __aeabi_uidiv(void); 419 extern void __aeabi_idiv(void); 420 uintptr_t fn_addr; 421 unsigned int mask; 422 423 mask = IS_ENABLED(CONFIG_THUMB2_KERNEL) ? HWCAP_IDIVT : HWCAP_IDIVA; 424 if (!(elf_hwcap & mask)) 425 return; 426 427 pr_info("CPU: div instructions available: patching division code\n"); 428 429 fn_addr = ((uintptr_t)&__aeabi_uidiv) & ~1; 430 asm ("" : "+g" (fn_addr)); 431 ((u32 *)fn_addr)[0] = udiv_instruction(); 432 ((u32 *)fn_addr)[1] = bx_lr_instruction(); 433 flush_icache_range(fn_addr, fn_addr + 8); 434 435 fn_addr = ((uintptr_t)&__aeabi_idiv) & ~1; 436 asm ("" : "+g" (fn_addr)); 437 ((u32 *)fn_addr)[0] = sdiv_instruction(); 438 ((u32 *)fn_addr)[1] = bx_lr_instruction(); 439 flush_icache_range(fn_addr, fn_addr + 8); 440 } 441 442 #else 443 static inline void patch_aeabi_idiv(void) { } 444 #endif 445 446 static void __init cpuid_init_hwcaps(void) 447 { 448 int block; 449 u32 isar5; 450 451 if (cpu_architecture() < CPU_ARCH_ARMv7) 452 return; 453 454 block = cpuid_feature_extract(CPUID_EXT_ISAR0, 24); 455 if (block >= 2) 456 elf_hwcap |= HWCAP_IDIVA; 457 if (block >= 1) 458 elf_hwcap |= HWCAP_IDIVT; 459 460 /* LPAE implies atomic ldrd/strd instructions */ 461 block = cpuid_feature_extract(CPUID_EXT_MMFR0, 0); 462 if (block >= 5) 463 elf_hwcap |= HWCAP_LPAE; 464 465 /* check for supported v8 Crypto instructions */ 466 isar5 = read_cpuid_ext(CPUID_EXT_ISAR5); 467 468 block = cpuid_feature_extract_field(isar5, 4); 469 if (block >= 2) 470 elf_hwcap2 |= HWCAP2_PMULL; 471 if (block >= 1) 472 elf_hwcap2 |= HWCAP2_AES; 473 474 block = cpuid_feature_extract_field(isar5, 8); 475 if (block >= 1) 476 elf_hwcap2 |= HWCAP2_SHA1; 477 478 block = cpuid_feature_extract_field(isar5, 12); 479 if (block >= 1) 480 elf_hwcap2 |= HWCAP2_SHA2; 481 482 block = cpuid_feature_extract_field(isar5, 16); 483 if (block >= 1) 484 elf_hwcap2 |= HWCAP2_CRC32; 485 } 486 487 static void __init elf_hwcap_fixup(void) 488 { 489 unsigned id = read_cpuid_id(); 490 491 /* 492 * HWCAP_TLS is available only on 1136 r1p0 and later, 493 * see also kuser_get_tls_init. 494 */ 495 if (read_cpuid_part() == ARM_CPU_PART_ARM1136 && 496 ((id >> 20) & 3) == 0) { 497 elf_hwcap &= ~HWCAP_TLS; 498 return; 499 } 500 501 /* Verify if CPUID scheme is implemented */ 502 if ((id & 0x000f0000) != 0x000f0000) 503 return; 504 505 /* 506 * If the CPU supports LDREX/STREX and LDREXB/STREXB, 507 * avoid advertising SWP; it may not be atomic with 508 * multiprocessing cores. 509 */ 510 if (cpuid_feature_extract(CPUID_EXT_ISAR3, 12) > 1 || 511 (cpuid_feature_extract(CPUID_EXT_ISAR3, 12) == 1 && 512 cpuid_feature_extract(CPUID_EXT_ISAR4, 20) >= 3)) 513 elf_hwcap &= ~HWCAP_SWP; 514 } 515 516 /* 517 * cpu_init - initialise one CPU. 518 * 519 * cpu_init sets up the per-CPU stacks. 520 */ 521 void notrace cpu_init(void) 522 { 523 #ifndef CONFIG_CPU_V7M 524 unsigned int cpu = smp_processor_id(); 525 struct stack *stk = &stacks[cpu]; 526 527 if (cpu >= NR_CPUS) { 528 pr_crit("CPU%u: bad primary CPU number\n", cpu); 529 BUG(); 530 } 531 532 /* 533 * This only works on resume and secondary cores. For booting on the 534 * boot cpu, smp_prepare_boot_cpu is called after percpu area setup. 535 */ 536 set_my_cpu_offset(per_cpu_offset(cpu)); 537 538 cpu_proc_init(); 539 540 /* 541 * Define the placement constraint for the inline asm directive below. 542 * In Thumb-2, msr with an immediate value is not allowed. 543 */ 544 #ifdef CONFIG_THUMB2_KERNEL 545 #define PLC "r" 546 #else 547 #define PLC "I" 548 #endif 549 550 /* 551 * setup stacks for re-entrant exception handlers 552 */ 553 __asm__ ( 554 "msr cpsr_c, %1\n\t" 555 "add r14, %0, %2\n\t" 556 "mov sp, r14\n\t" 557 "msr cpsr_c, %3\n\t" 558 "add r14, %0, %4\n\t" 559 "mov sp, r14\n\t" 560 "msr cpsr_c, %5\n\t" 561 "add r14, %0, %6\n\t" 562 "mov sp, r14\n\t" 563 "msr cpsr_c, %7\n\t" 564 "add r14, %0, %8\n\t" 565 "mov sp, r14\n\t" 566 "msr cpsr_c, %9" 567 : 568 : "r" (stk), 569 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE), 570 "I" (offsetof(struct stack, irq[0])), 571 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE), 572 "I" (offsetof(struct stack, abt[0])), 573 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE), 574 "I" (offsetof(struct stack, und[0])), 575 PLC (PSR_F_BIT | PSR_I_BIT | FIQ_MODE), 576 "I" (offsetof(struct stack, fiq[0])), 577 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE) 578 : "r14"); 579 #endif 580 } 581 582 u32 __cpu_logical_map[NR_CPUS] = { [0 ... NR_CPUS-1] = MPIDR_INVALID }; 583 584 void __init smp_setup_processor_id(void) 585 { 586 int i; 587 u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0; 588 u32 cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0); 589 590 cpu_logical_map(0) = cpu; 591 for (i = 1; i < nr_cpu_ids; ++i) 592 cpu_logical_map(i) = i == cpu ? 0 : i; 593 594 /* 595 * clear __my_cpu_offset on boot CPU to avoid hang caused by 596 * using percpu variable early, for example, lockdep will 597 * access percpu variable inside lock_release 598 */ 599 set_my_cpu_offset(0); 600 601 pr_info("Booting Linux on physical CPU 0x%x\n", mpidr); 602 } 603 604 struct mpidr_hash mpidr_hash; 605 #ifdef CONFIG_SMP 606 /** 607 * smp_build_mpidr_hash - Pre-compute shifts required at each affinity 608 * level in order to build a linear index from an 609 * MPIDR value. Resulting algorithm is a collision 610 * free hash carried out through shifting and ORing 611 */ 612 static void __init smp_build_mpidr_hash(void) 613 { 614 u32 i, affinity; 615 u32 fs[3], bits[3], ls, mask = 0; 616 /* 617 * Pre-scan the list of MPIDRS and filter out bits that do 618 * not contribute to affinity levels, ie they never toggle. 619 */ 620 for_each_possible_cpu(i) 621 mask |= (cpu_logical_map(i) ^ cpu_logical_map(0)); 622 pr_debug("mask of set bits 0x%x\n", mask); 623 /* 624 * Find and stash the last and first bit set at all affinity levels to 625 * check how many bits are required to represent them. 626 */ 627 for (i = 0; i < 3; i++) { 628 affinity = MPIDR_AFFINITY_LEVEL(mask, i); 629 /* 630 * Find the MSB bit and LSB bits position 631 * to determine how many bits are required 632 * to express the affinity level. 633 */ 634 ls = fls(affinity); 635 fs[i] = affinity ? ffs(affinity) - 1 : 0; 636 bits[i] = ls - fs[i]; 637 } 638 /* 639 * An index can be created from the MPIDR by isolating the 640 * significant bits at each affinity level and by shifting 641 * them in order to compress the 24 bits values space to a 642 * compressed set of values. This is equivalent to hashing 643 * the MPIDR through shifting and ORing. It is a collision free 644 * hash though not minimal since some levels might contain a number 645 * of CPUs that is not an exact power of 2 and their bit 646 * representation might contain holes, eg MPIDR[7:0] = {0x2, 0x80}. 647 */ 648 mpidr_hash.shift_aff[0] = fs[0]; 649 mpidr_hash.shift_aff[1] = MPIDR_LEVEL_BITS + fs[1] - bits[0]; 650 mpidr_hash.shift_aff[2] = 2*MPIDR_LEVEL_BITS + fs[2] - 651 (bits[1] + bits[0]); 652 mpidr_hash.mask = mask; 653 mpidr_hash.bits = bits[2] + bits[1] + bits[0]; 654 pr_debug("MPIDR hash: aff0[%u] aff1[%u] aff2[%u] mask[0x%x] bits[%u]\n", 655 mpidr_hash.shift_aff[0], 656 mpidr_hash.shift_aff[1], 657 mpidr_hash.shift_aff[2], 658 mpidr_hash.mask, 659 mpidr_hash.bits); 660 /* 661 * 4x is an arbitrary value used to warn on a hash table much bigger 662 * than expected on most systems. 663 */ 664 if (mpidr_hash_size() > 4 * num_possible_cpus()) 665 pr_warn("Large number of MPIDR hash buckets detected\n"); 666 sync_cache_w(&mpidr_hash); 667 } 668 #endif 669 670 static void __init setup_processor(void) 671 { 672 struct proc_info_list *list; 673 674 /* 675 * locate processor in the list of supported processor 676 * types. The linker builds this table for us from the 677 * entries in arch/arm/mm/proc-*.S 678 */ 679 list = lookup_processor_type(read_cpuid_id()); 680 if (!list) { 681 pr_err("CPU configuration botched (ID %08x), unable to continue.\n", 682 read_cpuid_id()); 683 while (1); 684 } 685 686 cpu_name = list->cpu_name; 687 __cpu_architecture = __get_cpu_architecture(); 688 689 #ifdef MULTI_CPU 690 processor = *list->proc; 691 #endif 692 #ifdef MULTI_TLB 693 cpu_tlb = *list->tlb; 694 #endif 695 #ifdef MULTI_USER 696 cpu_user = *list->user; 697 #endif 698 #ifdef MULTI_CACHE 699 cpu_cache = *list->cache; 700 #endif 701 702 pr_info("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n", 703 cpu_name, read_cpuid_id(), read_cpuid_id() & 15, 704 proc_arch[cpu_architecture()], get_cr()); 705 706 snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c", 707 list->arch_name, ENDIANNESS); 708 snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c", 709 list->elf_name, ENDIANNESS); 710 elf_hwcap = list->elf_hwcap; 711 712 cpuid_init_hwcaps(); 713 patch_aeabi_idiv(); 714 715 #ifndef CONFIG_ARM_THUMB 716 elf_hwcap &= ~(HWCAP_THUMB | HWCAP_IDIVT); 717 #endif 718 #ifdef CONFIG_MMU 719 init_default_cache_policy(list->__cpu_mm_mmu_flags); 720 #endif 721 erratum_a15_798181_init(); 722 723 elf_hwcap_fixup(); 724 725 cacheid_init(); 726 cpu_init(); 727 } 728 729 void __init dump_machine_table(void) 730 { 731 const struct machine_desc *p; 732 733 early_print("Available machine support:\n\nID (hex)\tNAME\n"); 734 for_each_machine_desc(p) 735 early_print("%08x\t%s\n", p->nr, p->name); 736 737 early_print("\nPlease check your kernel config and/or bootloader.\n"); 738 739 while (true) 740 /* can't use cpu_relax() here as it may require MMU setup */; 741 } 742 743 int __init arm_add_memory(u64 start, u64 size) 744 { 745 u64 aligned_start; 746 747 /* 748 * Ensure that start/size are aligned to a page boundary. 749 * Size is rounded down, start is rounded up. 750 */ 751 aligned_start = PAGE_ALIGN(start); 752 if (aligned_start > start + size) 753 size = 0; 754 else 755 size -= aligned_start - start; 756 757 #ifndef CONFIG_ARCH_PHYS_ADDR_T_64BIT 758 if (aligned_start > ULONG_MAX) { 759 pr_crit("Ignoring memory at 0x%08llx outside 32-bit physical address space\n", 760 (long long)start); 761 return -EINVAL; 762 } 763 764 if (aligned_start + size > ULONG_MAX) { 765 pr_crit("Truncating memory at 0x%08llx to fit in 32-bit physical address space\n", 766 (long long)start); 767 /* 768 * To ensure bank->start + bank->size is representable in 769 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB. 770 * This means we lose a page after masking. 771 */ 772 size = ULONG_MAX - aligned_start; 773 } 774 #endif 775 776 if (aligned_start < PHYS_OFFSET) { 777 if (aligned_start + size <= PHYS_OFFSET) { 778 pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n", 779 aligned_start, aligned_start + size); 780 return -EINVAL; 781 } 782 783 pr_info("Ignoring memory below PHYS_OFFSET: 0x%08llx-0x%08llx\n", 784 aligned_start, (u64)PHYS_OFFSET); 785 786 size -= PHYS_OFFSET - aligned_start; 787 aligned_start = PHYS_OFFSET; 788 } 789 790 start = aligned_start; 791 size = size & ~(phys_addr_t)(PAGE_SIZE - 1); 792 793 /* 794 * Check whether this memory region has non-zero size or 795 * invalid node number. 796 */ 797 if (size == 0) 798 return -EINVAL; 799 800 memblock_add(start, size); 801 return 0; 802 } 803 804 /* 805 * Pick out the memory size. We look for mem=size@start, 806 * where start and size are "size[KkMm]" 807 */ 808 809 static int __init early_mem(char *p) 810 { 811 static int usermem __initdata = 0; 812 u64 size; 813 u64 start; 814 char *endp; 815 816 /* 817 * If the user specifies memory size, we 818 * blow away any automatically generated 819 * size. 820 */ 821 if (usermem == 0) { 822 usermem = 1; 823 memblock_remove(memblock_start_of_DRAM(), 824 memblock_end_of_DRAM() - memblock_start_of_DRAM()); 825 } 826 827 start = PHYS_OFFSET; 828 size = memparse(p, &endp); 829 if (*endp == '@') 830 start = memparse(endp + 1, NULL); 831 832 arm_add_memory(start, size); 833 834 return 0; 835 } 836 early_param("mem", early_mem); 837 838 static void __init request_standard_resources(const struct machine_desc *mdesc) 839 { 840 struct memblock_region *region; 841 struct resource *res; 842 843 kernel_code.start = virt_to_phys(_text); 844 kernel_code.end = virt_to_phys(__init_begin - 1); 845 kernel_data.start = virt_to_phys(_sdata); 846 kernel_data.end = virt_to_phys(_end - 1); 847 848 for_each_memblock(memory, region) { 849 phys_addr_t start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 850 phys_addr_t end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 851 unsigned long boot_alias_start; 852 853 /* 854 * Some systems have a special memory alias which is only 855 * used for booting. We need to advertise this region to 856 * kexec-tools so they know where bootable RAM is located. 857 */ 858 boot_alias_start = phys_to_idmap(start); 859 if (arm_has_idmap_alias() && boot_alias_start != IDMAP_INVALID_ADDR) { 860 res = memblock_virt_alloc(sizeof(*res), 0); 861 res->name = "System RAM (boot alias)"; 862 res->start = boot_alias_start; 863 res->end = phys_to_idmap(end); 864 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 865 request_resource(&iomem_resource, res); 866 } 867 868 res = memblock_virt_alloc(sizeof(*res), 0); 869 res->name = "System RAM"; 870 res->start = start; 871 res->end = end; 872 res->flags = IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY; 873 874 request_resource(&iomem_resource, res); 875 876 if (kernel_code.start >= res->start && 877 kernel_code.end <= res->end) 878 request_resource(res, &kernel_code); 879 if (kernel_data.start >= res->start && 880 kernel_data.end <= res->end) 881 request_resource(res, &kernel_data); 882 } 883 884 if (mdesc->video_start) { 885 video_ram.start = mdesc->video_start; 886 video_ram.end = mdesc->video_end; 887 request_resource(&iomem_resource, &video_ram); 888 } 889 890 /* 891 * Some machines don't have the possibility of ever 892 * possessing lp0, lp1 or lp2 893 */ 894 if (mdesc->reserve_lp0) 895 request_resource(&ioport_resource, &lp0); 896 if (mdesc->reserve_lp1) 897 request_resource(&ioport_resource, &lp1); 898 if (mdesc->reserve_lp2) 899 request_resource(&ioport_resource, &lp2); 900 } 901 902 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) || \ 903 defined(CONFIG_EFI) 904 struct screen_info screen_info = { 905 .orig_video_lines = 30, 906 .orig_video_cols = 80, 907 .orig_video_mode = 0, 908 .orig_video_ega_bx = 0, 909 .orig_video_isVGA = 1, 910 .orig_video_points = 8 911 }; 912 #endif 913 914 static int __init customize_machine(void) 915 { 916 /* 917 * customizes platform devices, or adds new ones 918 * On DT based machines, we fall back to populating the 919 * machine from the device tree, if no callback is provided, 920 * otherwise we would always need an init_machine callback. 921 */ 922 if (machine_desc->init_machine) 923 machine_desc->init_machine(); 924 925 return 0; 926 } 927 arch_initcall(customize_machine); 928 929 static int __init init_machine_late(void) 930 { 931 struct device_node *root; 932 int ret; 933 934 if (machine_desc->init_late) 935 machine_desc->init_late(); 936 937 root = of_find_node_by_path("/"); 938 if (root) { 939 ret = of_property_read_string(root, "serial-number", 940 &system_serial); 941 if (ret) 942 system_serial = NULL; 943 } 944 945 if (!system_serial) 946 system_serial = kasprintf(GFP_KERNEL, "%08x%08x", 947 system_serial_high, 948 system_serial_low); 949 950 return 0; 951 } 952 late_initcall(init_machine_late); 953 954 #ifdef CONFIG_KEXEC 955 /* 956 * The crash region must be aligned to 128MB to avoid 957 * zImage relocating below the reserved region. 958 */ 959 #define CRASH_ALIGN (128 << 20) 960 961 static inline unsigned long long get_total_mem(void) 962 { 963 unsigned long total; 964 965 total = max_low_pfn - min_low_pfn; 966 return total << PAGE_SHIFT; 967 } 968 969 /** 970 * reserve_crashkernel() - reserves memory are for crash kernel 971 * 972 * This function reserves memory area given in "crashkernel=" kernel command 973 * line parameter. The memory reserved is used by a dump capture kernel when 974 * primary kernel is crashing. 975 */ 976 static void __init reserve_crashkernel(void) 977 { 978 unsigned long long crash_size, crash_base; 979 unsigned long long total_mem; 980 int ret; 981 982 total_mem = get_total_mem(); 983 ret = parse_crashkernel(boot_command_line, total_mem, 984 &crash_size, &crash_base); 985 if (ret) 986 return; 987 988 if (crash_base <= 0) { 989 unsigned long long crash_max = idmap_to_phys((u32)~0); 990 crash_base = memblock_find_in_range(CRASH_ALIGN, crash_max, 991 crash_size, CRASH_ALIGN); 992 if (!crash_base) { 993 pr_err("crashkernel reservation failed - No suitable area found.\n"); 994 return; 995 } 996 } else { 997 unsigned long long start; 998 999 start = memblock_find_in_range(crash_base, 1000 crash_base + crash_size, 1001 crash_size, SECTION_SIZE); 1002 if (start != crash_base) { 1003 pr_err("crashkernel reservation failed - memory is in use.\n"); 1004 return; 1005 } 1006 } 1007 1008 ret = memblock_reserve(crash_base, crash_size); 1009 if (ret < 0) { 1010 pr_warn("crashkernel reservation failed - memory is in use (0x%lx)\n", 1011 (unsigned long)crash_base); 1012 return; 1013 } 1014 1015 pr_info("Reserving %ldMB of memory at %ldMB for crashkernel (System RAM: %ldMB)\n", 1016 (unsigned long)(crash_size >> 20), 1017 (unsigned long)(crash_base >> 20), 1018 (unsigned long)(total_mem >> 20)); 1019 1020 /* The crashk resource must always be located in normal mem */ 1021 crashk_res.start = crash_base; 1022 crashk_res.end = crash_base + crash_size - 1; 1023 insert_resource(&iomem_resource, &crashk_res); 1024 1025 if (arm_has_idmap_alias()) { 1026 /* 1027 * If we have a special RAM alias for use at boot, we 1028 * need to advertise to kexec tools where the alias is. 1029 */ 1030 static struct resource crashk_boot_res = { 1031 .name = "Crash kernel (boot alias)", 1032 .flags = IORESOURCE_BUSY | IORESOURCE_MEM, 1033 }; 1034 1035 crashk_boot_res.start = phys_to_idmap(crash_base); 1036 crashk_boot_res.end = crashk_boot_res.start + crash_size - 1; 1037 insert_resource(&iomem_resource, &crashk_boot_res); 1038 } 1039 } 1040 #else 1041 static inline void reserve_crashkernel(void) {} 1042 #endif /* CONFIG_KEXEC */ 1043 1044 void __init hyp_mode_check(void) 1045 { 1046 #ifdef CONFIG_ARM_VIRT_EXT 1047 sync_boot_mode(); 1048 1049 if (is_hyp_mode_available()) { 1050 pr_info("CPU: All CPU(s) started in HYP mode.\n"); 1051 pr_info("CPU: Virtualization extensions available.\n"); 1052 } else if (is_hyp_mode_mismatched()) { 1053 pr_warn("CPU: WARNING: CPU(s) started in wrong/inconsistent modes (primary CPU mode 0x%x)\n", 1054 __boot_cpu_mode & MODE_MASK); 1055 pr_warn("CPU: This may indicate a broken bootloader or firmware.\n"); 1056 } else 1057 pr_info("CPU: All CPU(s) started in SVC mode.\n"); 1058 #endif 1059 } 1060 1061 void __init setup_arch(char **cmdline_p) 1062 { 1063 const struct machine_desc *mdesc; 1064 1065 setup_processor(); 1066 mdesc = setup_machine_fdt(__atags_pointer); 1067 if (!mdesc) 1068 mdesc = setup_machine_tags(__atags_pointer, __machine_arch_type); 1069 machine_desc = mdesc; 1070 machine_name = mdesc->name; 1071 dump_stack_set_arch_desc("%s", mdesc->name); 1072 1073 if (mdesc->reboot_mode != REBOOT_HARD) 1074 reboot_mode = mdesc->reboot_mode; 1075 1076 init_mm.start_code = (unsigned long) _text; 1077 init_mm.end_code = (unsigned long) _etext; 1078 init_mm.end_data = (unsigned long) _edata; 1079 init_mm.brk = (unsigned long) _end; 1080 1081 /* populate cmd_line too for later use, preserving boot_command_line */ 1082 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); 1083 *cmdline_p = cmd_line; 1084 1085 early_fixmap_init(); 1086 early_ioremap_init(); 1087 1088 parse_early_param(); 1089 1090 #ifdef CONFIG_MMU 1091 early_mm_init(mdesc); 1092 #endif 1093 setup_dma_zone(mdesc); 1094 xen_early_init(); 1095 efi_init(); 1096 /* 1097 * Make sure the calculation for lowmem/highmem is set appropriately 1098 * before reserving/allocating any mmeory 1099 */ 1100 adjust_lowmem_bounds(); 1101 arm_memblock_init(mdesc); 1102 /* Memory may have been removed so recalculate the bounds. */ 1103 adjust_lowmem_bounds(); 1104 1105 early_ioremap_reset(); 1106 1107 paging_init(mdesc); 1108 request_standard_resources(mdesc); 1109 1110 if (mdesc->restart) 1111 arm_pm_restart = mdesc->restart; 1112 1113 unflatten_device_tree(); 1114 1115 arm_dt_init_cpu_maps(); 1116 psci_dt_init(); 1117 #ifdef CONFIG_SMP 1118 if (is_smp()) { 1119 if (!mdesc->smp_init || !mdesc->smp_init()) { 1120 if (psci_smp_available()) 1121 smp_set_ops(&psci_smp_ops); 1122 else if (mdesc->smp) 1123 smp_set_ops(mdesc->smp); 1124 } 1125 smp_init_cpus(); 1126 smp_build_mpidr_hash(); 1127 } 1128 #endif 1129 1130 if (!is_smp()) 1131 hyp_mode_check(); 1132 1133 reserve_crashkernel(); 1134 1135 #ifdef CONFIG_MULTI_IRQ_HANDLER 1136 handle_arch_irq = mdesc->handle_irq; 1137 #endif 1138 1139 #ifdef CONFIG_VT 1140 #if defined(CONFIG_VGA_CONSOLE) 1141 conswitchp = &vga_con; 1142 #elif defined(CONFIG_DUMMY_CONSOLE) 1143 conswitchp = &dummy_con; 1144 #endif 1145 #endif 1146 1147 if (mdesc->init_early) 1148 mdesc->init_early(); 1149 } 1150 1151 1152 static int __init topology_init(void) 1153 { 1154 int cpu; 1155 1156 for_each_possible_cpu(cpu) { 1157 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu); 1158 cpuinfo->cpu.hotpluggable = platform_can_hotplug_cpu(cpu); 1159 register_cpu(&cpuinfo->cpu, cpu); 1160 } 1161 1162 return 0; 1163 } 1164 subsys_initcall(topology_init); 1165 1166 #ifdef CONFIG_HAVE_PROC_CPU 1167 static int __init proc_cpu_init(void) 1168 { 1169 struct proc_dir_entry *res; 1170 1171 res = proc_mkdir("cpu", NULL); 1172 if (!res) 1173 return -ENOMEM; 1174 return 0; 1175 } 1176 fs_initcall(proc_cpu_init); 1177 #endif 1178 1179 static const char *hwcap_str[] = { 1180 "swp", 1181 "half", 1182 "thumb", 1183 "26bit", 1184 "fastmult", 1185 "fpa", 1186 "vfp", 1187 "edsp", 1188 "java", 1189 "iwmmxt", 1190 "crunch", 1191 "thumbee", 1192 "neon", 1193 "vfpv3", 1194 "vfpv3d16", 1195 "tls", 1196 "vfpv4", 1197 "idiva", 1198 "idivt", 1199 "vfpd32", 1200 "lpae", 1201 "evtstrm", 1202 NULL 1203 }; 1204 1205 static const char *hwcap2_str[] = { 1206 "aes", 1207 "pmull", 1208 "sha1", 1209 "sha2", 1210 "crc32", 1211 NULL 1212 }; 1213 1214 static int c_show(struct seq_file *m, void *v) 1215 { 1216 int i, j; 1217 u32 cpuid; 1218 1219 for_each_online_cpu(i) { 1220 /* 1221 * glibc reads /proc/cpuinfo to determine the number of 1222 * online processors, looking for lines beginning with 1223 * "processor". Give glibc what it expects. 1224 */ 1225 seq_printf(m, "processor\t: %d\n", i); 1226 cpuid = is_smp() ? per_cpu(cpu_data, i).cpuid : read_cpuid_id(); 1227 seq_printf(m, "model name\t: %s rev %d (%s)\n", 1228 cpu_name, cpuid & 15, elf_platform); 1229 1230 #if defined(CONFIG_SMP) 1231 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", 1232 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ), 1233 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100); 1234 #else 1235 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", 1236 loops_per_jiffy / (500000/HZ), 1237 (loops_per_jiffy / (5000/HZ)) % 100); 1238 #endif 1239 /* dump out the processor features */ 1240 seq_puts(m, "Features\t: "); 1241 1242 for (j = 0; hwcap_str[j]; j++) 1243 if (elf_hwcap & (1 << j)) 1244 seq_printf(m, "%s ", hwcap_str[j]); 1245 1246 for (j = 0; hwcap2_str[j]; j++) 1247 if (elf_hwcap2 & (1 << j)) 1248 seq_printf(m, "%s ", hwcap2_str[j]); 1249 1250 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", cpuid >> 24); 1251 seq_printf(m, "CPU architecture: %s\n", 1252 proc_arch[cpu_architecture()]); 1253 1254 if ((cpuid & 0x0008f000) == 0x00000000) { 1255 /* pre-ARM7 */ 1256 seq_printf(m, "CPU part\t: %07x\n", cpuid >> 4); 1257 } else { 1258 if ((cpuid & 0x0008f000) == 0x00007000) { 1259 /* ARM7 */ 1260 seq_printf(m, "CPU variant\t: 0x%02x\n", 1261 (cpuid >> 16) & 127); 1262 } else { 1263 /* post-ARM7 */ 1264 seq_printf(m, "CPU variant\t: 0x%x\n", 1265 (cpuid >> 20) & 15); 1266 } 1267 seq_printf(m, "CPU part\t: 0x%03x\n", 1268 (cpuid >> 4) & 0xfff); 1269 } 1270 seq_printf(m, "CPU revision\t: %d\n\n", cpuid & 15); 1271 } 1272 1273 seq_printf(m, "Hardware\t: %s\n", machine_name); 1274 seq_printf(m, "Revision\t: %04x\n", system_rev); 1275 seq_printf(m, "Serial\t\t: %s\n", system_serial); 1276 1277 return 0; 1278 } 1279 1280 static void *c_start(struct seq_file *m, loff_t *pos) 1281 { 1282 return *pos < 1 ? (void *)1 : NULL; 1283 } 1284 1285 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 1286 { 1287 ++*pos; 1288 return NULL; 1289 } 1290 1291 static void c_stop(struct seq_file *m, void *v) 1292 { 1293 } 1294 1295 const struct seq_operations cpuinfo_op = { 1296 .start = c_start, 1297 .next = c_next, 1298 .stop = c_stop, 1299 .show = c_show 1300 }; 1301