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/export.h> 11 #include <linux/kernel.h> 12 #include <linux/stddef.h> 13 #include <linux/ioport.h> 14 #include <linux/delay.h> 15 #include <linux/utsname.h> 16 #include <linux/initrd.h> 17 #include <linux/console.h> 18 #include <linux/bootmem.h> 19 #include <linux/seq_file.h> 20 #include <linux/screen_info.h> 21 #include <linux/init.h> 22 #include <linux/kexec.h> 23 #include <linux/of_fdt.h> 24 #include <linux/root_dev.h> 25 #include <linux/cpu.h> 26 #include <linux/interrupt.h> 27 #include <linux/smp.h> 28 #include <linux/fs.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 35 #include <asm/unified.h> 36 #include <asm/cp15.h> 37 #include <asm/cpu.h> 38 #include <asm/cputype.h> 39 #include <asm/elf.h> 40 #include <asm/procinfo.h> 41 #include <asm/sections.h> 42 #include <asm/setup.h> 43 #include <asm/smp_plat.h> 44 #include <asm/mach-types.h> 45 #include <asm/cacheflush.h> 46 #include <asm/cachetype.h> 47 #include <asm/tlbflush.h> 48 49 #include <asm/prom.h> 50 #include <asm/mach/arch.h> 51 #include <asm/mach/irq.h> 52 #include <asm/mach/time.h> 53 #include <asm/system_info.h> 54 #include <asm/system_misc.h> 55 #include <asm/traps.h> 56 #include <asm/unwind.h> 57 #include <asm/memblock.h> 58 59 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT) 60 #include "compat.h" 61 #endif 62 #include "atags.h" 63 #include "tcm.h" 64 65 #ifndef MEM_SIZE 66 #define MEM_SIZE (16*1024*1024) 67 #endif 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 paging_init(struct machine_desc *desc); 82 extern void sanity_check_meminfo(void); 83 extern void reboot_setup(char *str); 84 extern void setup_dma_zone(struct machine_desc *desc); 85 86 unsigned int processor_id; 87 EXPORT_SYMBOL(processor_id); 88 unsigned int __machine_arch_type __read_mostly; 89 EXPORT_SYMBOL(__machine_arch_type); 90 unsigned int cacheid __read_mostly; 91 EXPORT_SYMBOL(cacheid); 92 93 unsigned int __atags_pointer __initdata; 94 95 unsigned int system_rev; 96 EXPORT_SYMBOL(system_rev); 97 98 unsigned int system_serial_low; 99 EXPORT_SYMBOL(system_serial_low); 100 101 unsigned int system_serial_high; 102 EXPORT_SYMBOL(system_serial_high); 103 104 unsigned int elf_hwcap __read_mostly; 105 EXPORT_SYMBOL(elf_hwcap); 106 107 108 #ifdef MULTI_CPU 109 struct processor processor __read_mostly; 110 #endif 111 #ifdef MULTI_TLB 112 struct cpu_tlb_fns cpu_tlb __read_mostly; 113 #endif 114 #ifdef MULTI_USER 115 struct cpu_user_fns cpu_user __read_mostly; 116 #endif 117 #ifdef MULTI_CACHE 118 struct cpu_cache_fns cpu_cache __read_mostly; 119 #endif 120 #ifdef CONFIG_OUTER_CACHE 121 struct outer_cache_fns outer_cache __read_mostly; 122 EXPORT_SYMBOL(outer_cache); 123 #endif 124 125 /* 126 * Cached cpu_architecture() result for use by assembler code. 127 * C code should use the cpu_architecture() function instead of accessing this 128 * variable directly. 129 */ 130 int __cpu_architecture __read_mostly = CPU_ARCH_UNKNOWN; 131 132 struct stack { 133 u32 irq[3]; 134 u32 abt[3]; 135 u32 und[3]; 136 } ____cacheline_aligned; 137 138 static struct stack stacks[NR_CPUS]; 139 140 char elf_platform[ELF_PLATFORM_SIZE]; 141 EXPORT_SYMBOL(elf_platform); 142 143 static const char *cpu_name; 144 static const char *machine_name; 145 static char __initdata cmd_line[COMMAND_LINE_SIZE]; 146 struct machine_desc *machine_desc __initdata; 147 148 static char default_command_line[COMMAND_LINE_SIZE] __initdata = CONFIG_CMDLINE; 149 static union { char c[4]; unsigned long l; } endian_test __initdata = { { 'l', '?', '?', 'b' } }; 150 #define ENDIANNESS ((char)endian_test.l) 151 152 DEFINE_PER_CPU(struct cpuinfo_arm, cpu_data); 153 154 /* 155 * Standard memory resources 156 */ 157 static struct resource mem_res[] = { 158 { 159 .name = "Video RAM", 160 .start = 0, 161 .end = 0, 162 .flags = IORESOURCE_MEM 163 }, 164 { 165 .name = "Kernel code", 166 .start = 0, 167 .end = 0, 168 .flags = IORESOURCE_MEM 169 }, 170 { 171 .name = "Kernel data", 172 .start = 0, 173 .end = 0, 174 .flags = IORESOURCE_MEM 175 } 176 }; 177 178 #define video_ram mem_res[0] 179 #define kernel_code mem_res[1] 180 #define kernel_data mem_res[2] 181 182 static struct resource io_res[] = { 183 { 184 .name = "reserved", 185 .start = 0x3bc, 186 .end = 0x3be, 187 .flags = IORESOURCE_IO | IORESOURCE_BUSY 188 }, 189 { 190 .name = "reserved", 191 .start = 0x378, 192 .end = 0x37f, 193 .flags = IORESOURCE_IO | IORESOURCE_BUSY 194 }, 195 { 196 .name = "reserved", 197 .start = 0x278, 198 .end = 0x27f, 199 .flags = IORESOURCE_IO | IORESOURCE_BUSY 200 } 201 }; 202 203 #define lp0 io_res[0] 204 #define lp1 io_res[1] 205 #define lp2 io_res[2] 206 207 static const char *proc_arch[] = { 208 "undefined/unknown", 209 "3", 210 "4", 211 "4T", 212 "5", 213 "5T", 214 "5TE", 215 "5TEJ", 216 "6TEJ", 217 "7", 218 "?(11)", 219 "?(12)", 220 "?(13)", 221 "?(14)", 222 "?(15)", 223 "?(16)", 224 "?(17)", 225 }; 226 227 static int __get_cpu_architecture(void) 228 { 229 int cpu_arch; 230 231 if ((read_cpuid_id() & 0x0008f000) == 0) { 232 cpu_arch = CPU_ARCH_UNKNOWN; 233 } else if ((read_cpuid_id() & 0x0008f000) == 0x00007000) { 234 cpu_arch = (read_cpuid_id() & (1 << 23)) ? CPU_ARCH_ARMv4T : CPU_ARCH_ARMv3; 235 } else if ((read_cpuid_id() & 0x00080000) == 0x00000000) { 236 cpu_arch = (read_cpuid_id() >> 16) & 7; 237 if (cpu_arch) 238 cpu_arch += CPU_ARCH_ARMv3; 239 } else if ((read_cpuid_id() & 0x000f0000) == 0x000f0000) { 240 unsigned int mmfr0; 241 242 /* Revised CPUID format. Read the Memory Model Feature 243 * Register 0 and check for VMSAv7 or PMSAv7 */ 244 asm("mrc p15, 0, %0, c0, c1, 4" 245 : "=r" (mmfr0)); 246 if ((mmfr0 & 0x0000000f) >= 0x00000003 || 247 (mmfr0 & 0x000000f0) >= 0x00000030) 248 cpu_arch = CPU_ARCH_ARMv7; 249 else if ((mmfr0 & 0x0000000f) == 0x00000002 || 250 (mmfr0 & 0x000000f0) == 0x00000020) 251 cpu_arch = CPU_ARCH_ARMv6; 252 else 253 cpu_arch = CPU_ARCH_UNKNOWN; 254 } else 255 cpu_arch = CPU_ARCH_UNKNOWN; 256 257 return cpu_arch; 258 } 259 260 int __pure cpu_architecture(void) 261 { 262 BUG_ON(__cpu_architecture == CPU_ARCH_UNKNOWN); 263 264 return __cpu_architecture; 265 } 266 267 static int cpu_has_aliasing_icache(unsigned int arch) 268 { 269 int aliasing_icache; 270 unsigned int id_reg, num_sets, line_size; 271 272 /* PIPT caches never alias. */ 273 if (icache_is_pipt()) 274 return 0; 275 276 /* arch specifies the register format */ 277 switch (arch) { 278 case CPU_ARCH_ARMv7: 279 asm("mcr p15, 2, %0, c0, c0, 0 @ set CSSELR" 280 : /* No output operands */ 281 : "r" (1)); 282 isb(); 283 asm("mrc p15, 1, %0, c0, c0, 0 @ read CCSIDR" 284 : "=r" (id_reg)); 285 line_size = 4 << ((id_reg & 0x7) + 2); 286 num_sets = ((id_reg >> 13) & 0x7fff) + 1; 287 aliasing_icache = (line_size * num_sets) > PAGE_SIZE; 288 break; 289 case CPU_ARCH_ARMv6: 290 aliasing_icache = read_cpuid_cachetype() & (1 << 11); 291 break; 292 default: 293 /* I-cache aliases will be handled by D-cache aliasing code */ 294 aliasing_icache = 0; 295 } 296 297 return aliasing_icache; 298 } 299 300 static void __init cacheid_init(void) 301 { 302 unsigned int cachetype = read_cpuid_cachetype(); 303 unsigned int arch = cpu_architecture(); 304 305 if (arch >= CPU_ARCH_ARMv6) { 306 if ((cachetype & (7 << 29)) == 4 << 29) { 307 /* ARMv7 register format */ 308 arch = CPU_ARCH_ARMv7; 309 cacheid = CACHEID_VIPT_NONALIASING; 310 switch (cachetype & (3 << 14)) { 311 case (1 << 14): 312 cacheid |= CACHEID_ASID_TAGGED; 313 break; 314 case (3 << 14): 315 cacheid |= CACHEID_PIPT; 316 break; 317 } 318 } else { 319 arch = CPU_ARCH_ARMv6; 320 if (cachetype & (1 << 23)) 321 cacheid = CACHEID_VIPT_ALIASING; 322 else 323 cacheid = CACHEID_VIPT_NONALIASING; 324 } 325 if (cpu_has_aliasing_icache(arch)) 326 cacheid |= CACHEID_VIPT_I_ALIASING; 327 } else { 328 cacheid = CACHEID_VIVT; 329 } 330 331 printk("CPU: %s data cache, %s instruction cache\n", 332 cache_is_vivt() ? "VIVT" : 333 cache_is_vipt_aliasing() ? "VIPT aliasing" : 334 cache_is_vipt_nonaliasing() ? "PIPT / VIPT nonaliasing" : "unknown", 335 cache_is_vivt() ? "VIVT" : 336 icache_is_vivt_asid_tagged() ? "VIVT ASID tagged" : 337 icache_is_vipt_aliasing() ? "VIPT aliasing" : 338 icache_is_pipt() ? "PIPT" : 339 cache_is_vipt_nonaliasing() ? "VIPT nonaliasing" : "unknown"); 340 } 341 342 /* 343 * These functions re-use the assembly code in head.S, which 344 * already provide the required functionality. 345 */ 346 extern struct proc_info_list *lookup_processor_type(unsigned int); 347 348 void __init early_print(const char *str, ...) 349 { 350 extern void printascii(const char *); 351 char buf[256]; 352 va_list ap; 353 354 va_start(ap, str); 355 vsnprintf(buf, sizeof(buf), str, ap); 356 va_end(ap); 357 358 #ifdef CONFIG_DEBUG_LL 359 printascii(buf); 360 #endif 361 printk("%s", buf); 362 } 363 364 static void __init feat_v6_fixup(void) 365 { 366 int id = read_cpuid_id(); 367 368 if ((id & 0xff0f0000) != 0x41070000) 369 return; 370 371 /* 372 * HWCAP_TLS is available only on 1136 r1p0 and later, 373 * see also kuser_get_tls_init. 374 */ 375 if ((((id >> 4) & 0xfff) == 0xb36) && (((id >> 20) & 3) == 0)) 376 elf_hwcap &= ~HWCAP_TLS; 377 } 378 379 /* 380 * cpu_init - initialise one CPU. 381 * 382 * cpu_init sets up the per-CPU stacks. 383 */ 384 void cpu_init(void) 385 { 386 unsigned int cpu = smp_processor_id(); 387 struct stack *stk = &stacks[cpu]; 388 389 if (cpu >= NR_CPUS) { 390 printk(KERN_CRIT "CPU%u: bad primary CPU number\n", cpu); 391 BUG(); 392 } 393 394 cpu_proc_init(); 395 396 /* 397 * Define the placement constraint for the inline asm directive below. 398 * In Thumb-2, msr with an immediate value is not allowed. 399 */ 400 #ifdef CONFIG_THUMB2_KERNEL 401 #define PLC "r" 402 #else 403 #define PLC "I" 404 #endif 405 406 /* 407 * setup stacks for re-entrant exception handlers 408 */ 409 __asm__ ( 410 "msr cpsr_c, %1\n\t" 411 "add r14, %0, %2\n\t" 412 "mov sp, r14\n\t" 413 "msr cpsr_c, %3\n\t" 414 "add r14, %0, %4\n\t" 415 "mov sp, r14\n\t" 416 "msr cpsr_c, %5\n\t" 417 "add r14, %0, %6\n\t" 418 "mov sp, r14\n\t" 419 "msr cpsr_c, %7" 420 : 421 : "r" (stk), 422 PLC (PSR_F_BIT | PSR_I_BIT | IRQ_MODE), 423 "I" (offsetof(struct stack, irq[0])), 424 PLC (PSR_F_BIT | PSR_I_BIT | ABT_MODE), 425 "I" (offsetof(struct stack, abt[0])), 426 PLC (PSR_F_BIT | PSR_I_BIT | UND_MODE), 427 "I" (offsetof(struct stack, und[0])), 428 PLC (PSR_F_BIT | PSR_I_BIT | SVC_MODE) 429 : "r14"); 430 } 431 432 int __cpu_logical_map[NR_CPUS]; 433 434 void __init smp_setup_processor_id(void) 435 { 436 int i; 437 u32 cpu = is_smp() ? read_cpuid_mpidr() & 0xff : 0; 438 439 cpu_logical_map(0) = cpu; 440 for (i = 1; i < NR_CPUS; ++i) 441 cpu_logical_map(i) = i == cpu ? 0 : i; 442 443 printk(KERN_INFO "Booting Linux on physical CPU %d\n", cpu); 444 } 445 446 static void __init setup_processor(void) 447 { 448 struct proc_info_list *list; 449 450 /* 451 * locate processor in the list of supported processor 452 * types. The linker builds this table for us from the 453 * entries in arch/arm/mm/proc-*.S 454 */ 455 list = lookup_processor_type(read_cpuid_id()); 456 if (!list) { 457 printk("CPU configuration botched (ID %08x), unable " 458 "to continue.\n", read_cpuid_id()); 459 while (1); 460 } 461 462 cpu_name = list->cpu_name; 463 __cpu_architecture = __get_cpu_architecture(); 464 465 #ifdef MULTI_CPU 466 processor = *list->proc; 467 #endif 468 #ifdef MULTI_TLB 469 cpu_tlb = *list->tlb; 470 #endif 471 #ifdef MULTI_USER 472 cpu_user = *list->user; 473 #endif 474 #ifdef MULTI_CACHE 475 cpu_cache = *list->cache; 476 #endif 477 478 printk("CPU: %s [%08x] revision %d (ARMv%s), cr=%08lx\n", 479 cpu_name, read_cpuid_id(), read_cpuid_id() & 15, 480 proc_arch[cpu_architecture()], cr_alignment); 481 482 snprintf(init_utsname()->machine, __NEW_UTS_LEN + 1, "%s%c", 483 list->arch_name, ENDIANNESS); 484 snprintf(elf_platform, ELF_PLATFORM_SIZE, "%s%c", 485 list->elf_name, ENDIANNESS); 486 elf_hwcap = list->elf_hwcap; 487 #ifndef CONFIG_ARM_THUMB 488 elf_hwcap &= ~HWCAP_THUMB; 489 #endif 490 491 feat_v6_fixup(); 492 493 cacheid_init(); 494 cpu_init(); 495 } 496 497 void __init dump_machine_table(void) 498 { 499 struct machine_desc *p; 500 501 early_print("Available machine support:\n\nID (hex)\tNAME\n"); 502 for_each_machine_desc(p) 503 early_print("%08x\t%s\n", p->nr, p->name); 504 505 early_print("\nPlease check your kernel config and/or bootloader.\n"); 506 507 while (true) 508 /* can't use cpu_relax() here as it may require MMU setup */; 509 } 510 511 int __init arm_add_memory(phys_addr_t start, phys_addr_t size) 512 { 513 struct membank *bank = &meminfo.bank[meminfo.nr_banks]; 514 515 if (meminfo.nr_banks >= NR_BANKS) { 516 printk(KERN_CRIT "NR_BANKS too low, " 517 "ignoring memory at 0x%08llx\n", (long long)start); 518 return -EINVAL; 519 } 520 521 /* 522 * Ensure that start/size are aligned to a page boundary. 523 * Size is appropriately rounded down, start is rounded up. 524 */ 525 size -= start & ~PAGE_MASK; 526 bank->start = PAGE_ALIGN(start); 527 528 #ifndef CONFIG_LPAE 529 if (bank->start + size < bank->start) { 530 printk(KERN_CRIT "Truncating memory at 0x%08llx to fit in " 531 "32-bit physical address space\n", (long long)start); 532 /* 533 * To ensure bank->start + bank->size is representable in 534 * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB. 535 * This means we lose a page after masking. 536 */ 537 size = ULONG_MAX - bank->start; 538 } 539 #endif 540 541 bank->size = size & ~(phys_addr_t)(PAGE_SIZE - 1); 542 543 /* 544 * Check whether this memory region has non-zero size or 545 * invalid node number. 546 */ 547 if (bank->size == 0) 548 return -EINVAL; 549 550 meminfo.nr_banks++; 551 return 0; 552 } 553 554 /* 555 * Pick out the memory size. We look for mem=size@start, 556 * where start and size are "size[KkMm]" 557 */ 558 static int __init early_mem(char *p) 559 { 560 static int usermem __initdata = 0; 561 phys_addr_t size; 562 phys_addr_t start; 563 char *endp; 564 565 /* 566 * If the user specifies memory size, we 567 * blow away any automatically generated 568 * size. 569 */ 570 if (usermem == 0) { 571 usermem = 1; 572 meminfo.nr_banks = 0; 573 } 574 575 start = PHYS_OFFSET; 576 size = memparse(p, &endp); 577 if (*endp == '@') 578 start = memparse(endp + 1, NULL); 579 580 arm_add_memory(start, size); 581 582 return 0; 583 } 584 early_param("mem", early_mem); 585 586 static void __init 587 setup_ramdisk(int doload, int prompt, int image_start, unsigned int rd_sz) 588 { 589 #ifdef CONFIG_BLK_DEV_RAM 590 extern int rd_size, rd_image_start, rd_prompt, rd_doload; 591 592 rd_image_start = image_start; 593 rd_prompt = prompt; 594 rd_doload = doload; 595 596 if (rd_sz) 597 rd_size = rd_sz; 598 #endif 599 } 600 601 static void __init request_standard_resources(struct machine_desc *mdesc) 602 { 603 struct memblock_region *region; 604 struct resource *res; 605 606 kernel_code.start = virt_to_phys(_text); 607 kernel_code.end = virt_to_phys(_etext - 1); 608 kernel_data.start = virt_to_phys(_sdata); 609 kernel_data.end = virt_to_phys(_end - 1); 610 611 for_each_memblock(memory, region) { 612 res = alloc_bootmem_low(sizeof(*res)); 613 res->name = "System RAM"; 614 res->start = __pfn_to_phys(memblock_region_memory_base_pfn(region)); 615 res->end = __pfn_to_phys(memblock_region_memory_end_pfn(region)) - 1; 616 res->flags = IORESOURCE_MEM | IORESOURCE_BUSY; 617 618 request_resource(&iomem_resource, res); 619 620 if (kernel_code.start >= res->start && 621 kernel_code.end <= res->end) 622 request_resource(res, &kernel_code); 623 if (kernel_data.start >= res->start && 624 kernel_data.end <= res->end) 625 request_resource(res, &kernel_data); 626 } 627 628 if (mdesc->video_start) { 629 video_ram.start = mdesc->video_start; 630 video_ram.end = mdesc->video_end; 631 request_resource(&iomem_resource, &video_ram); 632 } 633 634 /* 635 * Some machines don't have the possibility of ever 636 * possessing lp0, lp1 or lp2 637 */ 638 if (mdesc->reserve_lp0) 639 request_resource(&ioport_resource, &lp0); 640 if (mdesc->reserve_lp1) 641 request_resource(&ioport_resource, &lp1); 642 if (mdesc->reserve_lp2) 643 request_resource(&ioport_resource, &lp2); 644 } 645 646 /* 647 * Tag parsing. 648 * 649 * This is the new way of passing data to the kernel at boot time. Rather 650 * than passing a fixed inflexible structure to the kernel, we pass a list 651 * of variable-sized tags to the kernel. The first tag must be a ATAG_CORE 652 * tag for the list to be recognised (to distinguish the tagged list from 653 * a param_struct). The list is terminated with a zero-length tag (this tag 654 * is not parsed in any way). 655 */ 656 static int __init parse_tag_core(const struct tag *tag) 657 { 658 if (tag->hdr.size > 2) { 659 if ((tag->u.core.flags & 1) == 0) 660 root_mountflags &= ~MS_RDONLY; 661 ROOT_DEV = old_decode_dev(tag->u.core.rootdev); 662 } 663 return 0; 664 } 665 666 __tagtable(ATAG_CORE, parse_tag_core); 667 668 static int __init parse_tag_mem32(const struct tag *tag) 669 { 670 return arm_add_memory(tag->u.mem.start, tag->u.mem.size); 671 } 672 673 __tagtable(ATAG_MEM, parse_tag_mem32); 674 675 #if defined(CONFIG_VGA_CONSOLE) || defined(CONFIG_DUMMY_CONSOLE) 676 struct screen_info screen_info = { 677 .orig_video_lines = 30, 678 .orig_video_cols = 80, 679 .orig_video_mode = 0, 680 .orig_video_ega_bx = 0, 681 .orig_video_isVGA = 1, 682 .orig_video_points = 8 683 }; 684 685 static int __init parse_tag_videotext(const struct tag *tag) 686 { 687 screen_info.orig_x = tag->u.videotext.x; 688 screen_info.orig_y = tag->u.videotext.y; 689 screen_info.orig_video_page = tag->u.videotext.video_page; 690 screen_info.orig_video_mode = tag->u.videotext.video_mode; 691 screen_info.orig_video_cols = tag->u.videotext.video_cols; 692 screen_info.orig_video_ega_bx = tag->u.videotext.video_ega_bx; 693 screen_info.orig_video_lines = tag->u.videotext.video_lines; 694 screen_info.orig_video_isVGA = tag->u.videotext.video_isvga; 695 screen_info.orig_video_points = tag->u.videotext.video_points; 696 return 0; 697 } 698 699 __tagtable(ATAG_VIDEOTEXT, parse_tag_videotext); 700 #endif 701 702 static int __init parse_tag_ramdisk(const struct tag *tag) 703 { 704 setup_ramdisk((tag->u.ramdisk.flags & 1) == 0, 705 (tag->u.ramdisk.flags & 2) == 0, 706 tag->u.ramdisk.start, tag->u.ramdisk.size); 707 return 0; 708 } 709 710 __tagtable(ATAG_RAMDISK, parse_tag_ramdisk); 711 712 static int __init parse_tag_serialnr(const struct tag *tag) 713 { 714 system_serial_low = tag->u.serialnr.low; 715 system_serial_high = tag->u.serialnr.high; 716 return 0; 717 } 718 719 __tagtable(ATAG_SERIAL, parse_tag_serialnr); 720 721 static int __init parse_tag_revision(const struct tag *tag) 722 { 723 system_rev = tag->u.revision.rev; 724 return 0; 725 } 726 727 __tagtable(ATAG_REVISION, parse_tag_revision); 728 729 static int __init parse_tag_cmdline(const struct tag *tag) 730 { 731 #if defined(CONFIG_CMDLINE_EXTEND) 732 strlcat(default_command_line, " ", COMMAND_LINE_SIZE); 733 strlcat(default_command_line, tag->u.cmdline.cmdline, 734 COMMAND_LINE_SIZE); 735 #elif defined(CONFIG_CMDLINE_FORCE) 736 pr_warning("Ignoring tag cmdline (using the default kernel command line)\n"); 737 #else 738 strlcpy(default_command_line, tag->u.cmdline.cmdline, 739 COMMAND_LINE_SIZE); 740 #endif 741 return 0; 742 } 743 744 __tagtable(ATAG_CMDLINE, parse_tag_cmdline); 745 746 /* 747 * Scan the tag table for this tag, and call its parse function. 748 * The tag table is built by the linker from all the __tagtable 749 * declarations. 750 */ 751 static int __init parse_tag(const struct tag *tag) 752 { 753 extern struct tagtable __tagtable_begin, __tagtable_end; 754 struct tagtable *t; 755 756 for (t = &__tagtable_begin; t < &__tagtable_end; t++) 757 if (tag->hdr.tag == t->tag) { 758 t->parse(tag); 759 break; 760 } 761 762 return t < &__tagtable_end; 763 } 764 765 /* 766 * Parse all tags in the list, checking both the global and architecture 767 * specific tag tables. 768 */ 769 static void __init parse_tags(const struct tag *t) 770 { 771 for (; t->hdr.size; t = tag_next(t)) 772 if (!parse_tag(t)) 773 printk(KERN_WARNING 774 "Ignoring unrecognised tag 0x%08x\n", 775 t->hdr.tag); 776 } 777 778 /* 779 * This holds our defaults. 780 */ 781 static struct init_tags { 782 struct tag_header hdr1; 783 struct tag_core core; 784 struct tag_header hdr2; 785 struct tag_mem32 mem; 786 struct tag_header hdr3; 787 } init_tags __initdata = { 788 { tag_size(tag_core), ATAG_CORE }, 789 { 1, PAGE_SIZE, 0xff }, 790 { tag_size(tag_mem32), ATAG_MEM }, 791 { MEM_SIZE }, 792 { 0, ATAG_NONE } 793 }; 794 795 static int __init customize_machine(void) 796 { 797 /* customizes platform devices, or adds new ones */ 798 if (machine_desc->init_machine) 799 machine_desc->init_machine(); 800 return 0; 801 } 802 arch_initcall(customize_machine); 803 804 static int __init init_machine_late(void) 805 { 806 if (machine_desc->init_late) 807 machine_desc->init_late(); 808 return 0; 809 } 810 late_initcall(init_machine_late); 811 812 #ifdef CONFIG_KEXEC 813 static inline unsigned long long get_total_mem(void) 814 { 815 unsigned long total; 816 817 total = max_low_pfn - min_low_pfn; 818 return total << PAGE_SHIFT; 819 } 820 821 /** 822 * reserve_crashkernel() - reserves memory are for crash kernel 823 * 824 * This function reserves memory area given in "crashkernel=" kernel command 825 * line parameter. The memory reserved is used by a dump capture kernel when 826 * primary kernel is crashing. 827 */ 828 static void __init reserve_crashkernel(void) 829 { 830 unsigned long long crash_size, crash_base; 831 unsigned long long total_mem; 832 int ret; 833 834 total_mem = get_total_mem(); 835 ret = parse_crashkernel(boot_command_line, total_mem, 836 &crash_size, &crash_base); 837 if (ret) 838 return; 839 840 ret = reserve_bootmem(crash_base, crash_size, BOOTMEM_EXCLUSIVE); 841 if (ret < 0) { 842 printk(KERN_WARNING "crashkernel reservation failed - " 843 "memory is in use (0x%lx)\n", (unsigned long)crash_base); 844 return; 845 } 846 847 printk(KERN_INFO "Reserving %ldMB of memory at %ldMB " 848 "for crashkernel (System RAM: %ldMB)\n", 849 (unsigned long)(crash_size >> 20), 850 (unsigned long)(crash_base >> 20), 851 (unsigned long)(total_mem >> 20)); 852 853 crashk_res.start = crash_base; 854 crashk_res.end = crash_base + crash_size - 1; 855 insert_resource(&iomem_resource, &crashk_res); 856 } 857 #else 858 static inline void reserve_crashkernel(void) {} 859 #endif /* CONFIG_KEXEC */ 860 861 static void __init squash_mem_tags(struct tag *tag) 862 { 863 for (; tag->hdr.size; tag = tag_next(tag)) 864 if (tag->hdr.tag == ATAG_MEM) 865 tag->hdr.tag = ATAG_NONE; 866 } 867 868 static struct machine_desc * __init setup_machine_tags(unsigned int nr) 869 { 870 struct tag *tags = (struct tag *)&init_tags; 871 struct machine_desc *mdesc = NULL, *p; 872 char *from = default_command_line; 873 874 init_tags.mem.start = PHYS_OFFSET; 875 876 /* 877 * locate machine in the list of supported machines. 878 */ 879 for_each_machine_desc(p) 880 if (nr == p->nr) { 881 printk("Machine: %s\n", p->name); 882 mdesc = p; 883 break; 884 } 885 886 if (!mdesc) { 887 early_print("\nError: unrecognized/unsupported machine ID" 888 " (r1 = 0x%08x).\n\n", nr); 889 dump_machine_table(); /* does not return */ 890 } 891 892 if (__atags_pointer) 893 tags = phys_to_virt(__atags_pointer); 894 else if (mdesc->atag_offset) 895 tags = (void *)(PAGE_OFFSET + mdesc->atag_offset); 896 897 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT) 898 /* 899 * If we have the old style parameters, convert them to 900 * a tag list. 901 */ 902 if (tags->hdr.tag != ATAG_CORE) 903 convert_to_tag_list(tags); 904 #endif 905 906 if (tags->hdr.tag != ATAG_CORE) { 907 #if defined(CONFIG_OF) 908 /* 909 * If CONFIG_OF is set, then assume this is a reasonably 910 * modern system that should pass boot parameters 911 */ 912 early_print("Warning: Neither atags nor dtb found\n"); 913 #endif 914 tags = (struct tag *)&init_tags; 915 } 916 917 if (mdesc->fixup) 918 mdesc->fixup(tags, &from, &meminfo); 919 920 if (tags->hdr.tag == ATAG_CORE) { 921 if (meminfo.nr_banks != 0) 922 squash_mem_tags(tags); 923 save_atags(tags); 924 parse_tags(tags); 925 } 926 927 /* parse_early_param needs a boot_command_line */ 928 strlcpy(boot_command_line, from, COMMAND_LINE_SIZE); 929 930 return mdesc; 931 } 932 933 static int __init meminfo_cmp(const void *_a, const void *_b) 934 { 935 const struct membank *a = _a, *b = _b; 936 long cmp = bank_pfn_start(a) - bank_pfn_start(b); 937 return cmp < 0 ? -1 : cmp > 0 ? 1 : 0; 938 } 939 940 void __init setup_arch(char **cmdline_p) 941 { 942 struct machine_desc *mdesc; 943 944 setup_processor(); 945 mdesc = setup_machine_fdt(__atags_pointer); 946 if (!mdesc) 947 mdesc = setup_machine_tags(machine_arch_type); 948 machine_desc = mdesc; 949 machine_name = mdesc->name; 950 951 setup_dma_zone(mdesc); 952 953 if (mdesc->restart_mode) 954 reboot_setup(&mdesc->restart_mode); 955 956 init_mm.start_code = (unsigned long) _text; 957 init_mm.end_code = (unsigned long) _etext; 958 init_mm.end_data = (unsigned long) _edata; 959 init_mm.brk = (unsigned long) _end; 960 961 /* populate cmd_line too for later use, preserving boot_command_line */ 962 strlcpy(cmd_line, boot_command_line, COMMAND_LINE_SIZE); 963 *cmdline_p = cmd_line; 964 965 parse_early_param(); 966 967 sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]), meminfo_cmp, NULL); 968 sanity_check_meminfo(); 969 arm_memblock_init(&meminfo, mdesc); 970 971 paging_init(mdesc); 972 request_standard_resources(mdesc); 973 974 if (mdesc->restart) 975 arm_pm_restart = mdesc->restart; 976 977 unflatten_device_tree(); 978 979 #ifdef CONFIG_SMP 980 if (is_smp()) 981 smp_init_cpus(); 982 #endif 983 reserve_crashkernel(); 984 985 tcm_init(); 986 987 #ifdef CONFIG_MULTI_IRQ_HANDLER 988 handle_arch_irq = mdesc->handle_irq; 989 #endif 990 991 #ifdef CONFIG_VT 992 #if defined(CONFIG_VGA_CONSOLE) 993 conswitchp = &vga_con; 994 #elif defined(CONFIG_DUMMY_CONSOLE) 995 conswitchp = &dummy_con; 996 #endif 997 #endif 998 999 if (mdesc->init_early) 1000 mdesc->init_early(); 1001 } 1002 1003 1004 static int __init topology_init(void) 1005 { 1006 int cpu; 1007 1008 for_each_possible_cpu(cpu) { 1009 struct cpuinfo_arm *cpuinfo = &per_cpu(cpu_data, cpu); 1010 cpuinfo->cpu.hotpluggable = 1; 1011 register_cpu(&cpuinfo->cpu, cpu); 1012 } 1013 1014 return 0; 1015 } 1016 subsys_initcall(topology_init); 1017 1018 #ifdef CONFIG_HAVE_PROC_CPU 1019 static int __init proc_cpu_init(void) 1020 { 1021 struct proc_dir_entry *res; 1022 1023 res = proc_mkdir("cpu", NULL); 1024 if (!res) 1025 return -ENOMEM; 1026 return 0; 1027 } 1028 fs_initcall(proc_cpu_init); 1029 #endif 1030 1031 static const char *hwcap_str[] = { 1032 "swp", 1033 "half", 1034 "thumb", 1035 "26bit", 1036 "fastmult", 1037 "fpa", 1038 "vfp", 1039 "edsp", 1040 "java", 1041 "iwmmxt", 1042 "crunch", 1043 "thumbee", 1044 "neon", 1045 "vfpv3", 1046 "vfpv3d16", 1047 "tls", 1048 "vfpv4", 1049 "idiva", 1050 "idivt", 1051 NULL 1052 }; 1053 1054 static int c_show(struct seq_file *m, void *v) 1055 { 1056 int i; 1057 1058 seq_printf(m, "Processor\t: %s rev %d (%s)\n", 1059 cpu_name, read_cpuid_id() & 15, elf_platform); 1060 1061 #if defined(CONFIG_SMP) 1062 for_each_online_cpu(i) { 1063 /* 1064 * glibc reads /proc/cpuinfo to determine the number of 1065 * online processors, looking for lines beginning with 1066 * "processor". Give glibc what it expects. 1067 */ 1068 seq_printf(m, "processor\t: %d\n", i); 1069 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n\n", 1070 per_cpu(cpu_data, i).loops_per_jiffy / (500000UL/HZ), 1071 (per_cpu(cpu_data, i).loops_per_jiffy / (5000UL/HZ)) % 100); 1072 } 1073 #else /* CONFIG_SMP */ 1074 seq_printf(m, "BogoMIPS\t: %lu.%02lu\n", 1075 loops_per_jiffy / (500000/HZ), 1076 (loops_per_jiffy / (5000/HZ)) % 100); 1077 #endif 1078 1079 /* dump out the processor features */ 1080 seq_puts(m, "Features\t: "); 1081 1082 for (i = 0; hwcap_str[i]; i++) 1083 if (elf_hwcap & (1 << i)) 1084 seq_printf(m, "%s ", hwcap_str[i]); 1085 1086 seq_printf(m, "\nCPU implementer\t: 0x%02x\n", read_cpuid_id() >> 24); 1087 seq_printf(m, "CPU architecture: %s\n", proc_arch[cpu_architecture()]); 1088 1089 if ((read_cpuid_id() & 0x0008f000) == 0x00000000) { 1090 /* pre-ARM7 */ 1091 seq_printf(m, "CPU part\t: %07x\n", read_cpuid_id() >> 4); 1092 } else { 1093 if ((read_cpuid_id() & 0x0008f000) == 0x00007000) { 1094 /* ARM7 */ 1095 seq_printf(m, "CPU variant\t: 0x%02x\n", 1096 (read_cpuid_id() >> 16) & 127); 1097 } else { 1098 /* post-ARM7 */ 1099 seq_printf(m, "CPU variant\t: 0x%x\n", 1100 (read_cpuid_id() >> 20) & 15); 1101 } 1102 seq_printf(m, "CPU part\t: 0x%03x\n", 1103 (read_cpuid_id() >> 4) & 0xfff); 1104 } 1105 seq_printf(m, "CPU revision\t: %d\n", read_cpuid_id() & 15); 1106 1107 seq_puts(m, "\n"); 1108 1109 seq_printf(m, "Hardware\t: %s\n", machine_name); 1110 seq_printf(m, "Revision\t: %04x\n", system_rev); 1111 seq_printf(m, "Serial\t\t: %08x%08x\n", 1112 system_serial_high, system_serial_low); 1113 1114 return 0; 1115 } 1116 1117 static void *c_start(struct seq_file *m, loff_t *pos) 1118 { 1119 return *pos < 1 ? (void *)1 : NULL; 1120 } 1121 1122 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 1123 { 1124 ++*pos; 1125 return NULL; 1126 } 1127 1128 static void c_stop(struct seq_file *m, void *v) 1129 { 1130 } 1131 1132 const struct seq_operations cpuinfo_op = { 1133 .start = c_start, 1134 .next = c_next, 1135 .stop = c_stop, 1136 .show = c_show 1137 }; 1138