setup_64.c revision abb17f9c3a92c5acf30e749efdf0419b7f50a5b8
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/module.h> 16#include <linux/string.h> 17#include <linux/sched.h> 18#include <linux/init.h> 19#include <linux/kernel.h> 20#include <linux/reboot.h> 21#include <linux/delay.h> 22#include <linux/initrd.h> 23#include <linux/seq_file.h> 24#include <linux/ioport.h> 25#include <linux/console.h> 26#include <linux/utsname.h> 27#include <linux/tty.h> 28#include <linux/root_dev.h> 29#include <linux/notifier.h> 30#include <linux/cpu.h> 31#include <linux/unistd.h> 32#include <linux/serial.h> 33#include <linux/serial_8250.h> 34#include <linux/bootmem.h> 35#include <linux/pci.h> 36#include <linux/lockdep.h> 37#include <linux/lmb.h> 38#include <asm/io.h> 39#include <asm/kdump.h> 40#include <asm/prom.h> 41#include <asm/processor.h> 42#include <asm/pgtable.h> 43#include <asm/smp.h> 44#include <asm/elf.h> 45#include <asm/machdep.h> 46#include <asm/paca.h> 47#include <asm/time.h> 48#include <asm/cputable.h> 49#include <asm/sections.h> 50#include <asm/btext.h> 51#include <asm/nvram.h> 52#include <asm/setup.h> 53#include <asm/system.h> 54#include <asm/rtas.h> 55#include <asm/iommu.h> 56#include <asm/serial.h> 57#include <asm/cache.h> 58#include <asm/page.h> 59#include <asm/mmu.h> 60#include <asm/firmware.h> 61#include <asm/xmon.h> 62#include <asm/udbg.h> 63#include <asm/kexec.h> 64#include <asm/mmu_context.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 74int boot_cpuid = 0; 75u64 ppc64_pft_size; 76 77/* Pick defaults since we might want to patch instructions 78 * before we've read this from the device tree. 79 */ 80struct ppc64_caches ppc64_caches = { 81 .dline_size = 0x40, 82 .log_dline_size = 6, 83 .iline_size = 0x40, 84 .log_iline_size = 6 85}; 86EXPORT_SYMBOL_GPL(ppc64_caches); 87 88/* 89 * These are used in binfmt_elf.c to put aux entries on the stack 90 * for each elf executable being started. 91 */ 92int dcache_bsize; 93int icache_bsize; 94int ucache_bsize; 95 96#ifdef CONFIG_SMP 97 98static int smt_enabled_cmdline; 99 100/* Look for ibm,smt-enabled OF option */ 101static void check_smt_enabled(void) 102{ 103 struct device_node *dn; 104 const char *smt_option; 105 106 /* Allow the command line to overrule the OF option */ 107 if (smt_enabled_cmdline) 108 return; 109 110 dn = of_find_node_by_path("/options"); 111 112 if (dn) { 113 smt_option = of_get_property(dn, "ibm,smt-enabled", NULL); 114 115 if (smt_option) { 116 if (!strcmp(smt_option, "on")) 117 smt_enabled_at_boot = 1; 118 else if (!strcmp(smt_option, "off")) 119 smt_enabled_at_boot = 0; 120 } 121 } 122} 123 124/* Look for smt-enabled= cmdline option */ 125static int __init early_smt_enabled(char *p) 126{ 127 smt_enabled_cmdline = 1; 128 129 if (!p) 130 return 0; 131 132 if (!strcmp(p, "on") || !strcmp(p, "1")) 133 smt_enabled_at_boot = 1; 134 else if (!strcmp(p, "off") || !strcmp(p, "0")) 135 smt_enabled_at_boot = 0; 136 137 return 0; 138} 139early_param("smt-enabled", early_smt_enabled); 140 141#else 142#define check_smt_enabled() 143#endif /* CONFIG_SMP */ 144 145/* Put the paca pointer into r13 and SPRG_PACA */ 146static void __init setup_paca(struct paca_struct *new_paca) 147{ 148 local_paca = new_paca; 149 mtspr(SPRN_SPRG_PACA, local_paca); 150#ifdef CONFIG_PPC_BOOK3E 151 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 152#endif 153} 154 155/* 156 * Early initialization entry point. This is called by head.S 157 * with MMU translation disabled. We rely on the "feature" of 158 * the CPU that ignores the top 2 bits of the address in real 159 * mode so we can access kernel globals normally provided we 160 * only toy with things in the RMO region. From here, we do 161 * some early parsing of the device-tree to setup out LMB 162 * data structures, and allocate & initialize the hash table 163 * and segment tables so we can start running with translation 164 * enabled. 165 * 166 * It is this function which will call the probe() callback of 167 * the various platform types and copy the matching one to the 168 * global ppc_md structure. Your platform can eventually do 169 * some very early initializations from the probe() routine, but 170 * this is not recommended, be very careful as, for example, the 171 * device-tree is not accessible via normal means at this point. 172 */ 173 174void __init early_setup(unsigned long dt_ptr) 175{ 176 /* -------- printk is _NOT_ safe to use here ! ------- */ 177 178 /* Identify CPU type */ 179 identify_cpu(0, mfspr(SPRN_PVR)); 180 181 /* Assume we're on cpu 0 for now. Don't write to the paca yet! */ 182 initialise_paca(&boot_paca, 0); 183 setup_paca(&boot_paca); 184 185 /* Initialize lockdep early or else spinlocks will blow */ 186 lockdep_init(); 187 188 /* -------- printk is now safe to use ------- */ 189 190 /* Enable early debugging if any specified (see udbg.h) */ 191 udbg_early_init(); 192 193 DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); 194 195 /* 196 * Do early initialization using the flattened device 197 * tree, such as retrieving the physical memory map or 198 * calculating/retrieving the hash table size. 199 */ 200 early_init_devtree(__va(dt_ptr)); 201 202 /* Now we know the logical id of our boot cpu, setup the paca. */ 203 setup_paca(&paca[boot_cpuid]); 204 205 /* Fix up paca fields required for the boot cpu */ 206 get_paca()->cpu_start = 1; 207 208 /* Probe the machine type */ 209 probe_machine(); 210 211 setup_kdump_trampoline(); 212 213 DBG("Found, Initializing memory management...\n"); 214 215 /* Initialize the hash table or TLB handling */ 216 early_init_mmu(); 217 218 DBG(" <- early_setup()\n"); 219} 220 221#ifdef CONFIG_SMP 222void early_setup_secondary(void) 223{ 224 /* Mark interrupts enabled in PACA */ 225 get_paca()->soft_enabled = 0; 226 227 /* Initialize the hash table or TLB handling */ 228 early_init_mmu_secondary(); 229} 230 231#endif /* CONFIG_SMP */ 232 233#if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) 234void smp_release_cpus(void) 235{ 236 unsigned long *ptr; 237 238 DBG(" -> smp_release_cpus()\n"); 239 240 /* All secondary cpus are spinning on a common spinloop, release them 241 * all now so they can start to spin on their individual paca 242 * spinloops. For non SMP kernels, the secondary cpus never get out 243 * of the common spinloop. 244 */ 245 246 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop 247 - PHYSICAL_START); 248 *ptr = __pa(generic_secondary_smp_init); 249 mb(); 250 251 DBG(" <- smp_release_cpus()\n"); 252} 253#endif /* CONFIG_SMP || CONFIG_KEXEC */ 254 255/* 256 * Initialize some remaining members of the ppc64_caches and systemcfg 257 * structures 258 * (at least until we get rid of them completely). This is mostly some 259 * cache informations about the CPU that will be used by cache flush 260 * routines and/or provided to userland 261 */ 262static void __init initialize_cache_info(void) 263{ 264 struct device_node *np; 265 unsigned long num_cpus = 0; 266 267 DBG(" -> initialize_cache_info()\n"); 268 269 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { 270 num_cpus += 1; 271 272 /* We're assuming *all* of the CPUs have the same 273 * d-cache and i-cache sizes... -Peter 274 */ 275 276 if ( num_cpus == 1 ) { 277 const u32 *sizep, *lsizep; 278 u32 size, lsize; 279 280 size = 0; 281 lsize = cur_cpu_spec->dcache_bsize; 282 sizep = of_get_property(np, "d-cache-size", NULL); 283 if (sizep != NULL) 284 size = *sizep; 285 lsizep = of_get_property(np, "d-cache-block-size", NULL); 286 /* fallback if block size missing */ 287 if (lsizep == NULL) 288 lsizep = of_get_property(np, "d-cache-line-size", NULL); 289 if (lsizep != NULL) 290 lsize = *lsizep; 291 if (sizep == 0 || lsizep == 0) 292 DBG("Argh, can't find dcache properties ! " 293 "sizep: %p, lsizep: %p\n", sizep, lsizep); 294 295 ppc64_caches.dsize = size; 296 ppc64_caches.dline_size = lsize; 297 ppc64_caches.log_dline_size = __ilog2(lsize); 298 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; 299 300 size = 0; 301 lsize = cur_cpu_spec->icache_bsize; 302 sizep = of_get_property(np, "i-cache-size", NULL); 303 if (sizep != NULL) 304 size = *sizep; 305 lsizep = of_get_property(np, "i-cache-block-size", NULL); 306 if (lsizep == NULL) 307 lsizep = of_get_property(np, "i-cache-line-size", NULL); 308 if (lsizep != NULL) 309 lsize = *lsizep; 310 if (sizep == 0 || lsizep == 0) 311 DBG("Argh, can't find icache properties ! " 312 "sizep: %p, lsizep: %p\n", sizep, lsizep); 313 314 ppc64_caches.isize = size; 315 ppc64_caches.iline_size = lsize; 316 ppc64_caches.log_iline_size = __ilog2(lsize); 317 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; 318 } 319 } 320 321 DBG(" <- initialize_cache_info()\n"); 322} 323 324 325/* 326 * Do some initial setup of the system. The parameters are those which 327 * were passed in from the bootloader. 328 */ 329void __init setup_system(void) 330{ 331 DBG(" -> setup_system()\n"); 332 333 /* Apply the CPUs-specific and firmware specific fixups to kernel 334 * text (nop out sections not relevant to this CPU or this firmware) 335 */ 336 do_feature_fixups(cur_cpu_spec->cpu_features, 337 &__start___ftr_fixup, &__stop___ftr_fixup); 338 do_feature_fixups(cur_cpu_spec->mmu_features, 339 &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup); 340 do_feature_fixups(powerpc_firmware_features, 341 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); 342 do_lwsync_fixups(cur_cpu_spec->cpu_features, 343 &__start___lwsync_fixup, &__stop___lwsync_fixup); 344 345 /* 346 * Unflatten the device-tree passed by prom_init or kexec 347 */ 348 unflatten_device_tree(); 349 350 /* 351 * Fill the ppc64_caches & systemcfg structures with informations 352 * retrieved from the device-tree. 353 */ 354 initialize_cache_info(); 355 356#ifdef CONFIG_PPC_RTAS 357 /* 358 * Initialize RTAS if available 359 */ 360 rtas_initialize(); 361#endif /* CONFIG_PPC_RTAS */ 362 363 /* 364 * Check if we have an initrd provided via the device-tree 365 */ 366 check_for_initrd(); 367 368 /* 369 * Do some platform specific early initializations, that includes 370 * setting up the hash table pointers. It also sets up some interrupt-mapping 371 * related options that will be used by finish_device_tree() 372 */ 373 if (ppc_md.init_early) 374 ppc_md.init_early(); 375 376 /* 377 * We can discover serial ports now since the above did setup the 378 * hash table management for us, thus ioremap works. We do that early 379 * so that further code can be debugged 380 */ 381 find_legacy_serial_ports(); 382 383 /* 384 * Register early console 385 */ 386 register_early_udbg_console(); 387 388 /* 389 * Initialize xmon 390 */ 391 xmon_setup(); 392 393 check_smt_enabled(); 394 smp_setup_cpu_maps(); 395 396#ifdef CONFIG_SMP 397 /* Release secondary cpus out of their spinloops at 0x60 now that 398 * we can map physical -> logical CPU ids 399 */ 400 smp_release_cpus(); 401#endif 402 403 printk("Starting Linux PPC64 %s\n", init_utsname()->version); 404 405 printk("-----------------------------------------------------\n"); 406 printk("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 407 printk("physicalMemorySize = 0x%llx\n", lmb_phys_mem_size()); 408 if (ppc64_caches.dline_size != 0x80) 409 printk("ppc64_caches.dcache_line_size = 0x%x\n", 410 ppc64_caches.dline_size); 411 if (ppc64_caches.iline_size != 0x80) 412 printk("ppc64_caches.icache_line_size = 0x%x\n", 413 ppc64_caches.iline_size); 414#ifdef CONFIG_PPC_STD_MMU_64 415 if (htab_address) 416 printk("htab_address = 0x%p\n", htab_address); 417 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); 418#endif /* CONFIG_PPC_STD_MMU_64 */ 419 if (PHYSICAL_START > 0) 420 printk("physical_start = 0x%llx\n", 421 (unsigned long long)PHYSICAL_START); 422 printk("-----------------------------------------------------\n"); 423 424 DBG(" <- setup_system()\n"); 425} 426 427#ifdef CONFIG_IRQSTACKS 428static void __init irqstack_early_init(void) 429{ 430 unsigned int i; 431 432 /* 433 * interrupt stacks must be under 256MB, we cannot afford to take 434 * SLB misses on them. 435 */ 436 for_each_possible_cpu(i) { 437 softirq_ctx[i] = (struct thread_info *) 438 __va(lmb_alloc_base(THREAD_SIZE, 439 THREAD_SIZE, 0x10000000)); 440 hardirq_ctx[i] = (struct thread_info *) 441 __va(lmb_alloc_base(THREAD_SIZE, 442 THREAD_SIZE, 0x10000000)); 443 } 444} 445#else 446#define irqstack_early_init() 447#endif 448 449#ifdef CONFIG_PPC_BOOK3E 450static void __init exc_lvl_early_init(void) 451{ 452 unsigned int i; 453 454 for_each_possible_cpu(i) { 455 critirq_ctx[i] = (struct thread_info *) 456 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); 457 dbgirq_ctx[i] = (struct thread_info *) 458 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); 459 mcheckirq_ctx[i] = (struct thread_info *) 460 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); 461 } 462} 463#else 464#define exc_lvl_early_init() 465#endif 466 467/* 468 * Stack space used when we detect a bad kernel stack pointer, and 469 * early in SMP boots before relocation is enabled. 470 */ 471static void __init emergency_stack_init(void) 472{ 473 unsigned long limit; 474 unsigned int i; 475 476 /* 477 * Emergency stacks must be under 256MB, we cannot afford to take 478 * SLB misses on them. The ABI also requires them to be 128-byte 479 * aligned. 480 * 481 * Since we use these as temporary stacks during secondary CPU 482 * bringup, we need to get at them in real mode. This means they 483 * must also be within the RMO region. 484 */ 485 limit = min(0x10000000ULL, lmb.rmo_size); 486 487 for_each_possible_cpu(i) { 488 unsigned long sp; 489 sp = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit); 490 sp += THREAD_SIZE; 491 paca[i].emergency_sp = __va(sp); 492 } 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 */ 500void __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 = (unsigned long)_stext; 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 exc_lvl_early_init(); 527 emergency_stack_init(); 528 529#ifdef CONFIG_PPC_STD_MMU_64 530 stabs_alloc(); 531#endif 532 /* set up the bootmem stuff with available memory */ 533 do_init_bootmem(); 534 sparse_init(); 535 536#ifdef CONFIG_DUMMY_CONSOLE 537 conswitchp = &dummy_con; 538#endif 539 540 if (ppc_md.setup_arch) 541 ppc_md.setup_arch(); 542 543 paging_init(); 544 545 /* Initialize the MMU context management stuff */ 546 mmu_context_init(); 547 548 ppc64_boot_msg(0x15, "Setup Done"); 549} 550 551 552/* ToDo: do something useful if ppc_md is not yet setup. */ 553#define PPC64_LINUX_FUNCTION 0x0f000000 554#define PPC64_IPL_MESSAGE 0xc0000000 555#define PPC64_TERM_MESSAGE 0xb0000000 556 557static void ppc64_do_msg(unsigned int src, const char *msg) 558{ 559 if (ppc_md.progress) { 560 char buf[128]; 561 562 sprintf(buf, "%08X\n", src); 563 ppc_md.progress(buf, 0); 564 snprintf(buf, 128, "%s", msg); 565 ppc_md.progress(buf, 0); 566 } 567} 568 569/* Print a boot progress message. */ 570void ppc64_boot_msg(unsigned int src, const char *msg) 571{ 572 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); 573 printk("[boot]%04x %s\n", src, msg); 574} 575 576#ifdef CONFIG_SMP 577#define PCPU_DYN_SIZE () 578 579static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align) 580{ 581 return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align, 582 __pa(MAX_DMA_ADDRESS)); 583} 584 585static void __init pcpu_fc_free(void *ptr, size_t size) 586{ 587 free_bootmem(__pa(ptr), size); 588} 589 590static int pcpu_cpu_distance(unsigned int from, unsigned int to) 591{ 592 if (cpu_to_node(from) == cpu_to_node(to)) 593 return LOCAL_DISTANCE; 594 else 595 return REMOTE_DISTANCE; 596} 597 598void __init setup_per_cpu_areas(void) 599{ 600 const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE; 601 size_t atom_size; 602 unsigned long delta; 603 unsigned int cpu; 604 int rc; 605 606 /* 607 * Linear mapping is one of 4K, 1M and 16M. For 4K, no need 608 * to group units. For larger mappings, use 1M atom which 609 * should be large enough to contain a number of units. 610 */ 611 if (mmu_linear_psize == MMU_PAGE_4K) 612 atom_size = PAGE_SIZE; 613 else 614 atom_size = 1 << 20; 615 616 rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance, 617 pcpu_fc_alloc, pcpu_fc_free); 618 if (rc < 0) 619 panic("cannot initialize percpu area (err=%d)", rc); 620 621 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; 622 for_each_possible_cpu(cpu) 623 paca[cpu].data_offset = delta + pcpu_unit_offsets[cpu]; 624} 625#endif 626 627 628#ifdef CONFIG_PPC_INDIRECT_IO 629struct ppc_pci_io ppc_pci_io; 630EXPORT_SYMBOL(ppc_pci_io); 631#endif /* CONFIG_PPC_INDIRECT_IO */ 632 633