| 1 | /* |
| 2 | * |
| 3 | * Common boot and setup code. |
| 4 | * |
| 5 | * Copyright (C) 2001 PPC64 Team, IBM Corp |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #undef DEBUG |
| 14 | |
| 15 | #include <linux/config.h> |
| 16 | #include <linux/module.h> |
| 17 | #include <linux/string.h> |
| 18 | #include <linux/sched.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/kernel.h> |
| 21 | #include <linux/reboot.h> |
| 22 | #include <linux/delay.h> |
| 23 | #include <linux/initrd.h> |
| 24 | #include <linux/ide.h> |
| 25 | #include <linux/seq_file.h> |
| 26 | #include <linux/ioport.h> |
| 27 | #include <linux/console.h> |
| 28 | #include <linux/utsname.h> |
| 29 | #include <linux/tty.h> |
| 30 | #include <linux/root_dev.h> |
| 31 | #include <linux/notifier.h> |
| 32 | #include <linux/cpu.h> |
| 33 | #include <linux/unistd.h> |
| 34 | #include <linux/serial.h> |
| 35 | #include <linux/serial_8250.h> |
| 36 | #include <linux/bootmem.h> |
| 37 | #include <asm/io.h> |
| 38 | #include <asm/kdump.h> |
| 39 | #include <asm/prom.h> |
| 40 | #include <asm/processor.h> |
| 41 | #include <asm/pgtable.h> |
| 42 | #include <asm/smp.h> |
| 43 | #include <asm/elf.h> |
| 44 | #include <asm/machdep.h> |
| 45 | #include <asm/paca.h> |
| 46 | #include <asm/time.h> |
| 47 | #include <asm/cputable.h> |
| 48 | #include <asm/sections.h> |
| 49 | #include <asm/btext.h> |
| 50 | #include <asm/nvram.h> |
| 51 | #include <asm/setup.h> |
| 52 | #include <asm/system.h> |
| 53 | #include <asm/rtas.h> |
| 54 | #include <asm/iommu.h> |
| 55 | #include <asm/serial.h> |
| 56 | #include <asm/cache.h> |
| 57 | #include <asm/page.h> |
| 58 | #include <asm/mmu.h> |
| 59 | #include <asm/lmb.h> |
| 60 | #include <asm/iseries/it_lp_naca.h> |
| 61 | #include <asm/firmware.h> |
| 62 | #include <asm/xmon.h> |
| 63 | #include <asm/udbg.h> |
| 64 | #include <asm/kexec.h> |
| 65 | |
| 66 | #include "setup.h" |
| 67 | |
| 68 | #ifdef DEBUG |
| 69 | #define DBG(fmt...) udbg_printf(fmt) |
| 70 | #else |
| 71 | #define DBG(fmt...) |
| 72 | #endif |
| 73 | |
| 74 | int have_of = 1; |
| 75 | int boot_cpuid = 0; |
| 76 | dev_t boot_dev; |
| 77 | u64 ppc64_pft_size; |
| 78 | |
| 79 | /* Pick defaults since we might want to patch instructions |
| 80 | * before we've read this from the device tree. |
| 81 | */ |
| 82 | struct ppc64_caches ppc64_caches = { |
| 83 | .dline_size = 0x80, |
| 84 | .log_dline_size = 7, |
| 85 | .iline_size = 0x80, |
| 86 | .log_iline_size = 7 |
| 87 | }; |
| 88 | EXPORT_SYMBOL_GPL(ppc64_caches); |
| 89 | |
| 90 | /* |
| 91 | * These are used in binfmt_elf.c to put aux entries on the stack |
| 92 | * for each elf executable being started. |
| 93 | */ |
| 94 | int dcache_bsize; |
| 95 | int icache_bsize; |
| 96 | int ucache_bsize; |
| 97 | |
| 98 | #ifdef CONFIG_MAGIC_SYSRQ |
| 99 | unsigned long SYSRQ_KEY; |
| 100 | #endif /* CONFIG_MAGIC_SYSRQ */ |
| 101 | |
| 102 | |
| 103 | #ifdef CONFIG_SMP |
| 104 | |
| 105 | static int smt_enabled_cmdline; |
| 106 | |
| 107 | /* Look for ibm,smt-enabled OF option */ |
| 108 | static void check_smt_enabled(void) |
| 109 | { |
| 110 | struct device_node *dn; |
| 111 | char *smt_option; |
| 112 | |
| 113 | /* Allow the command line to overrule the OF option */ |
| 114 | if (smt_enabled_cmdline) |
| 115 | return; |
| 116 | |
| 117 | dn = of_find_node_by_path("/options"); |
| 118 | |
| 119 | if (dn) { |
| 120 | smt_option = (char *)get_property(dn, "ibm,smt-enabled", NULL); |
| 121 | |
| 122 | if (smt_option) { |
| 123 | if (!strcmp(smt_option, "on")) |
| 124 | smt_enabled_at_boot = 1; |
| 125 | else if (!strcmp(smt_option, "off")) |
| 126 | smt_enabled_at_boot = 0; |
| 127 | } |
| 128 | } |
| 129 | } |
| 130 | |
| 131 | /* Look for smt-enabled= cmdline option */ |
| 132 | static int __init early_smt_enabled(char *p) |
| 133 | { |
| 134 | smt_enabled_cmdline = 1; |
| 135 | |
| 136 | if (!p) |
| 137 | return 0; |
| 138 | |
| 139 | if (!strcmp(p, "on") || !strcmp(p, "1")) |
| 140 | smt_enabled_at_boot = 1; |
| 141 | else if (!strcmp(p, "off") || !strcmp(p, "0")) |
| 142 | smt_enabled_at_boot = 0; |
| 143 | |
| 144 | return 0; |
| 145 | } |
| 146 | early_param("smt-enabled", early_smt_enabled); |
| 147 | |
| 148 | #else |
| 149 | #define check_smt_enabled() |
| 150 | #endif /* CONFIG_SMP */ |
| 151 | |
| 152 | /* |
| 153 | * Early initialization entry point. This is called by head.S |
| 154 | * with MMU translation disabled. We rely on the "feature" of |
| 155 | * the CPU that ignores the top 2 bits of the address in real |
| 156 | * mode so we can access kernel globals normally provided we |
| 157 | * only toy with things in the RMO region. From here, we do |
| 158 | * some early parsing of the device-tree to setup out LMB |
| 159 | * data structures, and allocate & initialize the hash table |
| 160 | * and segment tables so we can start running with translation |
| 161 | * enabled. |
| 162 | * |
| 163 | * It is this function which will call the probe() callback of |
| 164 | * the various platform types and copy the matching one to the |
| 165 | * global ppc_md structure. Your platform can eventually do |
| 166 | * some very early initializations from the probe() routine, but |
| 167 | * this is not recommended, be very careful as, for example, the |
| 168 | * device-tree is not accessible via normal means at this point. |
| 169 | */ |
| 170 | |
| 171 | void __init early_setup(unsigned long dt_ptr) |
| 172 | { |
| 173 | /* Enable early debugging if any specified (see udbg.h) */ |
| 174 | udbg_early_init(); |
| 175 | |
| 176 | DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); |
| 177 | |
| 178 | /* |
| 179 | * Do early initializations using the flattened device |
| 180 | * tree, like retreiving the physical memory map or |
| 181 | * calculating/retreiving the hash table size |
| 182 | */ |
| 183 | early_init_devtree(__va(dt_ptr)); |
| 184 | |
| 185 | /* Now we know the logical id of our boot cpu, setup the paca. */ |
| 186 | setup_boot_paca(); |
| 187 | |
| 188 | /* Fix up paca fields required for the boot cpu */ |
| 189 | get_paca()->cpu_start = 1; |
| 190 | get_paca()->stab_real = __pa((u64)&initial_stab); |
| 191 | get_paca()->stab_addr = (u64)&initial_stab; |
| 192 | |
| 193 | /* Probe the machine type */ |
| 194 | probe_machine(); |
| 195 | |
| 196 | #ifdef CONFIG_CRASH_DUMP |
| 197 | kdump_setup(); |
| 198 | #endif |
| 199 | |
| 200 | DBG("Found, Initializing memory management...\n"); |
| 201 | |
| 202 | /* |
| 203 | * Initialize the MMU Hash table and create the linear mapping |
| 204 | * of memory. Has to be done before stab/slb initialization as |
| 205 | * this is currently where the page size encoding is obtained |
| 206 | */ |
| 207 | htab_initialize(); |
| 208 | |
| 209 | /* |
| 210 | * Initialize stab / SLB management except on iSeries |
| 211 | */ |
| 212 | if (cpu_has_feature(CPU_FTR_SLB)) |
| 213 | slb_initialize(); |
| 214 | else if (!firmware_has_feature(FW_FEATURE_ISERIES)) |
| 215 | stab_initialize(get_paca()->stab_real); |
| 216 | |
| 217 | DBG(" <- early_setup()\n"); |
| 218 | } |
| 219 | |
| 220 | #ifdef CONFIG_SMP |
| 221 | void early_setup_secondary(void) |
| 222 | { |
| 223 | struct paca_struct *lpaca = get_paca(); |
| 224 | |
| 225 | /* Mark enabled in PACA */ |
| 226 | lpaca->proc_enabled = 0; |
| 227 | |
| 228 | /* Initialize hash table for that CPU */ |
| 229 | htab_initialize_secondary(); |
| 230 | |
| 231 | /* Initialize STAB/SLB. We use a virtual address as it works |
| 232 | * in real mode on pSeries and we want a virutal address on |
| 233 | * iSeries anyway |
| 234 | */ |
| 235 | if (cpu_has_feature(CPU_FTR_SLB)) |
| 236 | slb_initialize(); |
| 237 | else |
| 238 | stab_initialize(lpaca->stab_addr); |
| 239 | } |
| 240 | |
| 241 | #endif /* CONFIG_SMP */ |
| 242 | |
| 243 | #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) |
| 244 | void smp_release_cpus(void) |
| 245 | { |
| 246 | extern unsigned long __secondary_hold_spinloop; |
| 247 | unsigned long *ptr; |
| 248 | |
| 249 | DBG(" -> smp_release_cpus()\n"); |
| 250 | |
| 251 | /* All secondary cpus are spinning on a common spinloop, release them |
| 252 | * all now so they can start to spin on their individual paca |
| 253 | * spinloops. For non SMP kernels, the secondary cpus never get out |
| 254 | * of the common spinloop. |
| 255 | * This is useless but harmless on iSeries, secondaries are already |
| 256 | * waiting on their paca spinloops. */ |
| 257 | |
| 258 | ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop |
| 259 | - PHYSICAL_START); |
| 260 | *ptr = 1; |
| 261 | mb(); |
| 262 | |
| 263 | DBG(" <- smp_release_cpus()\n"); |
| 264 | } |
| 265 | #endif /* CONFIG_SMP || CONFIG_KEXEC */ |
| 266 | |
| 267 | /* |
| 268 | * Initialize some remaining members of the ppc64_caches and systemcfg |
| 269 | * structures |
| 270 | * (at least until we get rid of them completely). This is mostly some |
| 271 | * cache informations about the CPU that will be used by cache flush |
| 272 | * routines and/or provided to userland |
| 273 | */ |
| 274 | static void __init initialize_cache_info(void) |
| 275 | { |
| 276 | struct device_node *np; |
| 277 | unsigned long num_cpus = 0; |
| 278 | |
| 279 | DBG(" -> initialize_cache_info()\n"); |
| 280 | |
| 281 | for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { |
| 282 | num_cpus += 1; |
| 283 | |
| 284 | /* We're assuming *all* of the CPUs have the same |
| 285 | * d-cache and i-cache sizes... -Peter |
| 286 | */ |
| 287 | |
| 288 | if ( num_cpus == 1 ) { |
| 289 | u32 *sizep, *lsizep; |
| 290 | u32 size, lsize; |
| 291 | const char *dc, *ic; |
| 292 | |
| 293 | /* Then read cache informations */ |
| 294 | if (machine_is(powermac)) { |
| 295 | dc = "d-cache-block-size"; |
| 296 | ic = "i-cache-block-size"; |
| 297 | } else { |
| 298 | dc = "d-cache-line-size"; |
| 299 | ic = "i-cache-line-size"; |
| 300 | } |
| 301 | |
| 302 | size = 0; |
| 303 | lsize = cur_cpu_spec->dcache_bsize; |
| 304 | sizep = (u32 *)get_property(np, "d-cache-size", NULL); |
| 305 | if (sizep != NULL) |
| 306 | size = *sizep; |
| 307 | lsizep = (u32 *) get_property(np, dc, NULL); |
| 308 | if (lsizep != NULL) |
| 309 | lsize = *lsizep; |
| 310 | if (sizep == 0 || lsizep == 0) |
| 311 | DBG("Argh, can't find dcache properties ! " |
| 312 | "sizep: %p, lsizep: %p\n", sizep, lsizep); |
| 313 | |
| 314 | ppc64_caches.dsize = size; |
| 315 | ppc64_caches.dline_size = lsize; |
| 316 | ppc64_caches.log_dline_size = __ilog2(lsize); |
| 317 | ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; |
| 318 | |
| 319 | size = 0; |
| 320 | lsize = cur_cpu_spec->icache_bsize; |
| 321 | sizep = (u32 *)get_property(np, "i-cache-size", NULL); |
| 322 | if (sizep != NULL) |
| 323 | size = *sizep; |
| 324 | lsizep = (u32 *)get_property(np, ic, NULL); |
| 325 | if (lsizep != NULL) |
| 326 | lsize = *lsizep; |
| 327 | if (sizep == 0 || lsizep == 0) |
| 328 | DBG("Argh, can't find icache properties ! " |
| 329 | "sizep: %p, lsizep: %p\n", sizep, lsizep); |
| 330 | |
| 331 | ppc64_caches.isize = size; |
| 332 | ppc64_caches.iline_size = lsize; |
| 333 | ppc64_caches.log_iline_size = __ilog2(lsize); |
| 334 | ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; |
| 335 | } |
| 336 | } |
| 337 | |
| 338 | DBG(" <- initialize_cache_info()\n"); |
| 339 | } |
| 340 | |
| 341 | |
| 342 | /* |
| 343 | * Do some initial setup of the system. The parameters are those which |
| 344 | * were passed in from the bootloader. |
| 345 | */ |
| 346 | void __init setup_system(void) |
| 347 | { |
| 348 | DBG(" -> setup_system()\n"); |
| 349 | |
| 350 | /* |
| 351 | * Unflatten the device-tree passed by prom_init or kexec |
| 352 | */ |
| 353 | unflatten_device_tree(); |
| 354 | |
| 355 | #ifdef CONFIG_KEXEC |
| 356 | kexec_setup(); /* requires unflattened device tree. */ |
| 357 | #endif |
| 358 | |
| 359 | /* |
| 360 | * Fill the ppc64_caches & systemcfg structures with informations |
| 361 | * retrieved from the device-tree. Need to be called before |
| 362 | * finish_device_tree() since the later requires some of the |
| 363 | * informations filled up here to properly parse the interrupt |
| 364 | * tree. |
| 365 | * It also sets up the cache line sizes which allows to call |
| 366 | * routines like flush_icache_range (used by the hash init |
| 367 | * later on). |
| 368 | */ |
| 369 | initialize_cache_info(); |
| 370 | |
| 371 | #ifdef CONFIG_PPC_RTAS |
| 372 | /* |
| 373 | * Initialize RTAS if available |
| 374 | */ |
| 375 | rtas_initialize(); |
| 376 | #endif /* CONFIG_PPC_RTAS */ |
| 377 | |
| 378 | /* |
| 379 | * Check if we have an initrd provided via the device-tree |
| 380 | */ |
| 381 | check_for_initrd(); |
| 382 | |
| 383 | /* |
| 384 | * Do some platform specific early initializations, that includes |
| 385 | * setting up the hash table pointers. It also sets up some interrupt-mapping |
| 386 | * related options that will be used by finish_device_tree() |
| 387 | */ |
| 388 | ppc_md.init_early(); |
| 389 | |
| 390 | /* |
| 391 | * We can discover serial ports now since the above did setup the |
| 392 | * hash table management for us, thus ioremap works. We do that early |
| 393 | * so that further code can be debugged |
| 394 | */ |
| 395 | find_legacy_serial_ports(); |
| 396 | |
| 397 | /* |
| 398 | * "Finish" the device-tree, that is do the actual parsing of |
| 399 | * some of the properties like the interrupt map |
| 400 | */ |
| 401 | finish_device_tree(); |
| 402 | |
| 403 | /* |
| 404 | * Initialize xmon |
| 405 | */ |
| 406 | #ifdef CONFIG_XMON_DEFAULT |
| 407 | xmon_init(1); |
| 408 | #endif |
| 409 | /* |
| 410 | * Register early console |
| 411 | */ |
| 412 | register_early_udbg_console(); |
| 413 | |
| 414 | if (do_early_xmon) |
| 415 | debugger(NULL); |
| 416 | |
| 417 | check_smt_enabled(); |
| 418 | smp_setup_cpu_maps(); |
| 419 | |
| 420 | #ifdef CONFIG_SMP |
| 421 | /* Release secondary cpus out of their spinloops at 0x60 now that |
| 422 | * we can map physical -> logical CPU ids |
| 423 | */ |
| 424 | smp_release_cpus(); |
| 425 | #endif |
| 426 | |
| 427 | printk("Starting Linux PPC64 %s\n", system_utsname.version); |
| 428 | |
| 429 | printk("-----------------------------------------------------\n"); |
| 430 | printk("ppc64_pft_size = 0x%lx\n", ppc64_pft_size); |
| 431 | printk("ppc64_interrupt_controller = 0x%ld\n", |
| 432 | ppc64_interrupt_controller); |
| 433 | printk("physicalMemorySize = 0x%lx\n", lmb_phys_mem_size()); |
| 434 | printk("ppc64_caches.dcache_line_size = 0x%x\n", |
| 435 | ppc64_caches.dline_size); |
| 436 | printk("ppc64_caches.icache_line_size = 0x%x\n", |
| 437 | ppc64_caches.iline_size); |
| 438 | printk("htab_address = 0x%p\n", htab_address); |
| 439 | printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); |
| 440 | #if PHYSICAL_START > 0 |
| 441 | printk("physical_start = 0x%x\n", PHYSICAL_START); |
| 442 | #endif |
| 443 | printk("-----------------------------------------------------\n"); |
| 444 | |
| 445 | DBG(" <- setup_system()\n"); |
| 446 | } |
| 447 | |
| 448 | #ifdef CONFIG_IRQSTACKS |
| 449 | static void __init irqstack_early_init(void) |
| 450 | { |
| 451 | unsigned int i; |
| 452 | |
| 453 | /* |
| 454 | * interrupt stacks must be under 256MB, we cannot afford to take |
| 455 | * SLB misses on them. |
| 456 | */ |
| 457 | for_each_possible_cpu(i) { |
| 458 | softirq_ctx[i] = (struct thread_info *) |
| 459 | __va(lmb_alloc_base(THREAD_SIZE, |
| 460 | THREAD_SIZE, 0x10000000)); |
| 461 | hardirq_ctx[i] = (struct thread_info *) |
| 462 | __va(lmb_alloc_base(THREAD_SIZE, |
| 463 | THREAD_SIZE, 0x10000000)); |
| 464 | } |
| 465 | } |
| 466 | #else |
| 467 | #define irqstack_early_init() |
| 468 | #endif |
| 469 | |
| 470 | /* |
| 471 | * Stack space used when we detect a bad kernel stack pointer, and |
| 472 | * early in SMP boots before relocation is enabled. |
| 473 | */ |
| 474 | static void __init emergency_stack_init(void) |
| 475 | { |
| 476 | unsigned long limit; |
| 477 | unsigned int i; |
| 478 | |
| 479 | /* |
| 480 | * Emergency stacks must be under 256MB, we cannot afford to take |
| 481 | * SLB misses on them. The ABI also requires them to be 128-byte |
| 482 | * aligned. |
| 483 | * |
| 484 | * Since we use these as temporary stacks during secondary CPU |
| 485 | * bringup, we need to get at them in real mode. This means they |
| 486 | * must also be within the RMO region. |
| 487 | */ |
| 488 | limit = min(0x10000000UL, lmb.rmo_size); |
| 489 | |
| 490 | for_each_possible_cpu(i) |
| 491 | paca[i].emergency_sp = |
| 492 | __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE; |
| 493 | } |
| 494 | |
| 495 | /* |
| 496 | * Called into from start_kernel, after lock_kernel has been called. |
| 497 | * Initializes bootmem, which is unsed to manage page allocation until |
| 498 | * mem_init is called. |
| 499 | */ |
| 500 | void __init setup_arch(char **cmdline_p) |
| 501 | { |
| 502 | ppc64_boot_msg(0x12, "Setup Arch"); |
| 503 | |
| 504 | *cmdline_p = cmd_line; |
| 505 | |
| 506 | /* |
| 507 | * Set cache line size based on type of cpu as a default. |
| 508 | * Systems with OF can look in the properties on the cpu node(s) |
| 509 | * for a possibly more accurate value. |
| 510 | */ |
| 511 | dcache_bsize = ppc64_caches.dline_size; |
| 512 | icache_bsize = ppc64_caches.iline_size; |
| 513 | |
| 514 | /* reboot on panic */ |
| 515 | panic_timeout = 180; |
| 516 | |
| 517 | if (ppc_md.panic) |
| 518 | setup_panic(); |
| 519 | |
| 520 | init_mm.start_code = PAGE_OFFSET; |
| 521 | init_mm.end_code = (unsigned long) _etext; |
| 522 | init_mm.end_data = (unsigned long) _edata; |
| 523 | init_mm.brk = klimit; |
| 524 | |
| 525 | irqstack_early_init(); |
| 526 | emergency_stack_init(); |
| 527 | |
| 528 | stabs_alloc(); |
| 529 | |
| 530 | /* set up the bootmem stuff with available memory */ |
| 531 | do_init_bootmem(); |
| 532 | sparse_init(); |
| 533 | |
| 534 | #ifdef CONFIG_DUMMY_CONSOLE |
| 535 | conswitchp = &dummy_con; |
| 536 | #endif |
| 537 | |
| 538 | ppc_md.setup_arch(); |
| 539 | |
| 540 | paging_init(); |
| 541 | ppc64_boot_msg(0x15, "Setup Done"); |
| 542 | } |
| 543 | |
| 544 | |
| 545 | /* ToDo: do something useful if ppc_md is not yet setup. */ |
| 546 | #define PPC64_LINUX_FUNCTION 0x0f000000 |
| 547 | #define PPC64_IPL_MESSAGE 0xc0000000 |
| 548 | #define PPC64_TERM_MESSAGE 0xb0000000 |
| 549 | |
| 550 | static void ppc64_do_msg(unsigned int src, const char *msg) |
| 551 | { |
| 552 | if (ppc_md.progress) { |
| 553 | char buf[128]; |
| 554 | |
| 555 | sprintf(buf, "%08X\n", src); |
| 556 | ppc_md.progress(buf, 0); |
| 557 | snprintf(buf, 128, "%s", msg); |
| 558 | ppc_md.progress(buf, 0); |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | /* Print a boot progress message. */ |
| 563 | void ppc64_boot_msg(unsigned int src, const char *msg) |
| 564 | { |
| 565 | ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); |
| 566 | printk("[boot]%04x %s\n", src, msg); |
| 567 | } |
| 568 | |
| 569 | /* Print a termination message (print only -- does not stop the kernel) */ |
| 570 | void ppc64_terminate_msg(unsigned int src, const char *msg) |
| 571 | { |
| 572 | ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg); |
| 573 | printk("[terminate]%04x %s\n", src, msg); |
| 574 | } |
| 575 | |
| 576 | void cpu_die(void) |
| 577 | { |
| 578 | if (ppc_md.cpu_die) |
| 579 | ppc_md.cpu_die(); |
| 580 | } |
| 581 | |
| 582 | #ifdef CONFIG_SMP |
| 583 | void __init setup_per_cpu_areas(void) |
| 584 | { |
| 585 | int i; |
| 586 | unsigned long size; |
| 587 | char *ptr; |
| 588 | |
| 589 | /* Copy section for each CPU (we discard the original) */ |
| 590 | size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES); |
| 591 | #ifdef CONFIG_MODULES |
| 592 | if (size < PERCPU_ENOUGH_ROOM) |
| 593 | size = PERCPU_ENOUGH_ROOM; |
| 594 | #endif |
| 595 | |
| 596 | for_each_possible_cpu(i) { |
| 597 | ptr = alloc_bootmem_node(NODE_DATA(cpu_to_node(i)), size); |
| 598 | if (!ptr) |
| 599 | panic("Cannot allocate cpu data for CPU %d\n", i); |
| 600 | |
| 601 | paca[i].data_offset = ptr - __per_cpu_start; |
| 602 | memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start); |
| 603 | } |
| 604 | } |
| 605 | #endif |