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/swiotlb.h> 65 #include <asm/mmu_context.h> 66 67 #include "setup.h" 68 69 #ifdef DEBUG 70 #define DBG(fmt...) udbg_printf(fmt) 71 #else 72 #define DBG(fmt...) 73 #endif 74 75 int boot_cpuid = 0; 76 u64 ppc64_pft_size; 77 78 /* Pick defaults since we might want to patch instructions 79 * before we've read this from the device tree. 80 */ 81 struct ppc64_caches ppc64_caches = { 82 .dline_size = 0x40, 83 .log_dline_size = 6, 84 .iline_size = 0x40, 85 .log_iline_size = 6 86 }; 87 EXPORT_SYMBOL_GPL(ppc64_caches); 88 89 /* 90 * These are used in binfmt_elf.c to put aux entries on the stack 91 * for each elf executable being started. 92 */ 93 int dcache_bsize; 94 int icache_bsize; 95 int ucache_bsize; 96 97 #ifdef CONFIG_SMP 98 99 static int smt_enabled_cmdline; 100 101 /* Look for ibm,smt-enabled OF option */ 102 static void check_smt_enabled(void) 103 { 104 struct device_node *dn; 105 const char *smt_option; 106 107 /* Allow the command line to overrule the OF option */ 108 if (smt_enabled_cmdline) 109 return; 110 111 dn = of_find_node_by_path("/options"); 112 113 if (dn) { 114 smt_option = of_get_property(dn, "ibm,smt-enabled", NULL); 115 116 if (smt_option) { 117 if (!strcmp(smt_option, "on")) 118 smt_enabled_at_boot = 1; 119 else if (!strcmp(smt_option, "off")) 120 smt_enabled_at_boot = 0; 121 } 122 } 123 } 124 125 /* Look for smt-enabled= cmdline option */ 126 static int __init early_smt_enabled(char *p) 127 { 128 smt_enabled_cmdline = 1; 129 130 if (!p) 131 return 0; 132 133 if (!strcmp(p, "on") || !strcmp(p, "1")) 134 smt_enabled_at_boot = 1; 135 else if (!strcmp(p, "off") || !strcmp(p, "0")) 136 smt_enabled_at_boot = 0; 137 138 return 0; 139 } 140 early_param("smt-enabled", early_smt_enabled); 141 142 #else 143 #define check_smt_enabled() 144 #endif /* CONFIG_SMP */ 145 146 /* Put the paca pointer into r13 and SPRG_PACA */ 147 static void __init setup_paca(struct paca_struct *new_paca) 148 { 149 local_paca = new_paca; 150 mtspr(SPRN_SPRG_PACA, local_paca); 151 #ifdef CONFIG_PPC_BOOK3E 152 mtspr(SPRN_SPRG_TLB_EXFRAME, local_paca->extlb); 153 #endif 154 } 155 156 /* 157 * Early initialization entry point. This is called by head.S 158 * with MMU translation disabled. We rely on the "feature" of 159 * the CPU that ignores the top 2 bits of the address in real 160 * mode so we can access kernel globals normally provided we 161 * only toy with things in the RMO region. From here, we do 162 * some early parsing of the device-tree to setup out LMB 163 * data structures, and allocate & initialize the hash table 164 * and segment tables so we can start running with translation 165 * enabled. 166 * 167 * It is this function which will call the probe() callback of 168 * the various platform types and copy the matching one to the 169 * global ppc_md structure. Your platform can eventually do 170 * some very early initializations from the probe() routine, but 171 * this is not recommended, be very careful as, for example, the 172 * device-tree is not accessible via normal means at this point. 173 */ 174 175 void __init early_setup(unsigned long dt_ptr) 176 { 177 /* -------- printk is _NOT_ safe to use here ! ------- */ 178 179 /* Identify CPU type */ 180 identify_cpu(0, mfspr(SPRN_PVR)); 181 182 /* Assume we're on cpu 0 for now. Don't write to the paca yet! */ 183 initialise_paca(&boot_paca, 0); 184 setup_paca(&boot_paca); 185 186 /* Initialize lockdep early or else spinlocks will blow */ 187 lockdep_init(); 188 189 /* -------- printk is now safe to use ------- */ 190 191 /* Enable early debugging if any specified (see udbg.h) */ 192 udbg_early_init(); 193 194 DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr); 195 196 /* 197 * Do early initialization using the flattened device 198 * tree, such as retrieving the physical memory map or 199 * calculating/retrieving the hash table size. 200 */ 201 early_init_devtree(__va(dt_ptr)); 202 203 /* Now we know the logical id of our boot cpu, setup the paca. */ 204 setup_paca(&paca[boot_cpuid]); 205 206 /* Fix up paca fields required for the boot cpu */ 207 get_paca()->cpu_start = 1; 208 209 /* Probe the machine type */ 210 probe_machine(); 211 212 setup_kdump_trampoline(); 213 214 DBG("Found, Initializing memory management...\n"); 215 216 /* Initialize the hash table or TLB handling */ 217 early_init_mmu(); 218 219 DBG(" <- early_setup()\n"); 220 } 221 222 #ifdef CONFIG_SMP 223 void early_setup_secondary(void) 224 { 225 /* Mark interrupts enabled in PACA */ 226 get_paca()->soft_enabled = 0; 227 228 /* Initialize the hash table or TLB handling */ 229 early_init_mmu_secondary(); 230 } 231 232 #endif /* CONFIG_SMP */ 233 234 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC) 235 void smp_release_cpus(void) 236 { 237 unsigned long *ptr; 238 239 DBG(" -> smp_release_cpus()\n"); 240 241 /* All secondary cpus are spinning on a common spinloop, release them 242 * all now so they can start to spin on their individual paca 243 * spinloops. For non SMP kernels, the secondary cpus never get out 244 * of the common spinloop. 245 */ 246 247 ptr = (unsigned long *)((unsigned long)&__secondary_hold_spinloop 248 - PHYSICAL_START); 249 *ptr = __pa(generic_secondary_smp_init); 250 mb(); 251 252 DBG(" <- smp_release_cpus()\n"); 253 } 254 #endif /* CONFIG_SMP || CONFIG_KEXEC */ 255 256 /* 257 * Initialize some remaining members of the ppc64_caches and systemcfg 258 * structures 259 * (at least until we get rid of them completely). This is mostly some 260 * cache informations about the CPU that will be used by cache flush 261 * routines and/or provided to userland 262 */ 263 static void __init initialize_cache_info(void) 264 { 265 struct device_node *np; 266 unsigned long num_cpus = 0; 267 268 DBG(" -> initialize_cache_info()\n"); 269 270 for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) { 271 num_cpus += 1; 272 273 /* We're assuming *all* of the CPUs have the same 274 * d-cache and i-cache sizes... -Peter 275 */ 276 277 if ( num_cpus == 1 ) { 278 const u32 *sizep, *lsizep; 279 u32 size, lsize; 280 281 size = 0; 282 lsize = cur_cpu_spec->dcache_bsize; 283 sizep = of_get_property(np, "d-cache-size", NULL); 284 if (sizep != NULL) 285 size = *sizep; 286 lsizep = of_get_property(np, "d-cache-block-size", NULL); 287 /* fallback if block size missing */ 288 if (lsizep == NULL) 289 lsizep = of_get_property(np, "d-cache-line-size", NULL); 290 if (lsizep != NULL) 291 lsize = *lsizep; 292 if (sizep == 0 || lsizep == 0) 293 DBG("Argh, can't find dcache properties ! " 294 "sizep: %p, lsizep: %p\n", sizep, lsizep); 295 296 ppc64_caches.dsize = size; 297 ppc64_caches.dline_size = lsize; 298 ppc64_caches.log_dline_size = __ilog2(lsize); 299 ppc64_caches.dlines_per_page = PAGE_SIZE / lsize; 300 301 size = 0; 302 lsize = cur_cpu_spec->icache_bsize; 303 sizep = of_get_property(np, "i-cache-size", NULL); 304 if (sizep != NULL) 305 size = *sizep; 306 lsizep = of_get_property(np, "i-cache-block-size", NULL); 307 if (lsizep == NULL) 308 lsizep = of_get_property(np, "i-cache-line-size", NULL); 309 if (lsizep != NULL) 310 lsize = *lsizep; 311 if (sizep == 0 || lsizep == 0) 312 DBG("Argh, can't find icache properties ! " 313 "sizep: %p, lsizep: %p\n", sizep, lsizep); 314 315 ppc64_caches.isize = size; 316 ppc64_caches.iline_size = lsize; 317 ppc64_caches.log_iline_size = __ilog2(lsize); 318 ppc64_caches.ilines_per_page = PAGE_SIZE / lsize; 319 } 320 } 321 322 DBG(" <- initialize_cache_info()\n"); 323 } 324 325 326 /* 327 * Do some initial setup of the system. The parameters are those which 328 * were passed in from the bootloader. 329 */ 330 void __init setup_system(void) 331 { 332 DBG(" -> setup_system()\n"); 333 334 /* Apply the CPUs-specific and firmware specific fixups to kernel 335 * text (nop out sections not relevant to this CPU or this firmware) 336 */ 337 do_feature_fixups(cur_cpu_spec->cpu_features, 338 &__start___ftr_fixup, &__stop___ftr_fixup); 339 do_feature_fixups(cur_cpu_spec->mmu_features, 340 &__start___mmu_ftr_fixup, &__stop___mmu_ftr_fixup); 341 do_feature_fixups(powerpc_firmware_features, 342 &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup); 343 do_lwsync_fixups(cur_cpu_spec->cpu_features, 344 &__start___lwsync_fixup, &__stop___lwsync_fixup); 345 346 /* 347 * Unflatten the device-tree passed by prom_init or kexec 348 */ 349 unflatten_device_tree(); 350 351 /* 352 * Fill the ppc64_caches & systemcfg structures with informations 353 * retrieved from the device-tree. 354 */ 355 initialize_cache_info(); 356 357 #ifdef CONFIG_PPC_RTAS 358 /* 359 * Initialize RTAS if available 360 */ 361 rtas_initialize(); 362 #endif /* CONFIG_PPC_RTAS */ 363 364 /* 365 * Check if we have an initrd provided via the device-tree 366 */ 367 check_for_initrd(); 368 369 /* 370 * Do some platform specific early initializations, that includes 371 * setting up the hash table pointers. It also sets up some interrupt-mapping 372 * related options that will be used by finish_device_tree() 373 */ 374 if (ppc_md.init_early) 375 ppc_md.init_early(); 376 377 /* 378 * We can discover serial ports now since the above did setup the 379 * hash table management for us, thus ioremap works. We do that early 380 * so that further code can be debugged 381 */ 382 find_legacy_serial_ports(); 383 384 /* 385 * Register early console 386 */ 387 register_early_udbg_console(); 388 389 /* 390 * Initialize xmon 391 */ 392 xmon_setup(); 393 394 check_smt_enabled(); 395 smp_setup_cpu_maps(); 396 397 #ifdef CONFIG_SMP 398 /* Release secondary cpus out of their spinloops at 0x60 now that 399 * we can map physical -> logical CPU ids 400 */ 401 smp_release_cpus(); 402 #endif 403 404 printk("Starting Linux PPC64 %s\n", init_utsname()->version); 405 406 printk("-----------------------------------------------------\n"); 407 printk("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 408 printk("physicalMemorySize = 0x%llx\n", lmb_phys_mem_size()); 409 if (ppc64_caches.dline_size != 0x80) 410 printk("ppc64_caches.dcache_line_size = 0x%x\n", 411 ppc64_caches.dline_size); 412 if (ppc64_caches.iline_size != 0x80) 413 printk("ppc64_caches.icache_line_size = 0x%x\n", 414 ppc64_caches.iline_size); 415 #ifdef CONFIG_PPC_STD_MMU_64 416 if (htab_address) 417 printk("htab_address = 0x%p\n", htab_address); 418 printk("htab_hash_mask = 0x%lx\n", htab_hash_mask); 419 #endif /* CONFIG_PPC_STD_MMU_64 */ 420 if (PHYSICAL_START > 0) 421 printk("physical_start = 0x%llx\n", 422 (unsigned long long)PHYSICAL_START); 423 printk("-----------------------------------------------------\n"); 424 425 DBG(" <- setup_system()\n"); 426 } 427 428 #ifdef CONFIG_IRQSTACKS 429 static void __init irqstack_early_init(void) 430 { 431 unsigned int i; 432 433 /* 434 * interrupt stacks must be under 256MB, we cannot afford to take 435 * SLB misses on them. 436 */ 437 for_each_possible_cpu(i) { 438 softirq_ctx[i] = (struct thread_info *) 439 __va(lmb_alloc_base(THREAD_SIZE, 440 THREAD_SIZE, 0x10000000)); 441 hardirq_ctx[i] = (struct thread_info *) 442 __va(lmb_alloc_base(THREAD_SIZE, 443 THREAD_SIZE, 0x10000000)); 444 } 445 } 446 #else 447 #define irqstack_early_init() 448 #endif 449 450 #ifdef CONFIG_PPC_BOOK3E 451 static void __init exc_lvl_early_init(void) 452 { 453 unsigned int i; 454 455 for_each_possible_cpu(i) { 456 critirq_ctx[i] = (struct thread_info *) 457 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); 458 dbgirq_ctx[i] = (struct thread_info *) 459 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); 460 mcheckirq_ctx[i] = (struct thread_info *) 461 __va(lmb_alloc(THREAD_SIZE, THREAD_SIZE)); 462 } 463 } 464 #else 465 #define exc_lvl_early_init() 466 #endif 467 468 /* 469 * Stack space used when we detect a bad kernel stack pointer, and 470 * early in SMP boots before relocation is enabled. 471 */ 472 static void __init emergency_stack_init(void) 473 { 474 unsigned long limit; 475 unsigned int i; 476 477 /* 478 * Emergency stacks must be under 256MB, we cannot afford to take 479 * SLB misses on them. The ABI also requires them to be 128-byte 480 * aligned. 481 * 482 * Since we use these as temporary stacks during secondary CPU 483 * bringup, we need to get at them in real mode. This means they 484 * must also be within the RMO region. 485 */ 486 limit = min(0x10000000ULL, lmb.rmo_size); 487 488 for_each_possible_cpu(i) { 489 unsigned long sp; 490 sp = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit); 491 sp += THREAD_SIZE; 492 paca[i].emergency_sp = __va(sp); 493 } 494 } 495 496 /* 497 * Called into from start_kernel, after lock_kernel has been called. 498 * Initializes bootmem, which is unsed to manage page allocation until 499 * mem_init is called. 500 */ 501 void __init setup_arch(char **cmdline_p) 502 { 503 ppc64_boot_msg(0x12, "Setup Arch"); 504 505 *cmdline_p = cmd_line; 506 507 /* 508 * Set cache line size based on type of cpu as a default. 509 * Systems with OF can look in the properties on the cpu node(s) 510 * for a possibly more accurate value. 511 */ 512 dcache_bsize = ppc64_caches.dline_size; 513 icache_bsize = ppc64_caches.iline_size; 514 515 /* reboot on panic */ 516 panic_timeout = 180; 517 518 if (ppc_md.panic) 519 setup_panic(); 520 521 init_mm.start_code = (unsigned long)_stext; 522 init_mm.end_code = (unsigned long) _etext; 523 init_mm.end_data = (unsigned long) _edata; 524 init_mm.brk = klimit; 525 526 irqstack_early_init(); 527 exc_lvl_early_init(); 528 emergency_stack_init(); 529 530 #ifdef CONFIG_PPC_STD_MMU_64 531 stabs_alloc(); 532 #endif 533 /* set up the bootmem stuff with available memory */ 534 do_init_bootmem(); 535 sparse_init(); 536 537 #ifdef CONFIG_DUMMY_CONSOLE 538 conswitchp = &dummy_con; 539 #endif 540 541 if (ppc_md.setup_arch) 542 ppc_md.setup_arch(); 543 544 #ifdef CONFIG_SWIOTLB 545 if (ppc_swiotlb_enable) 546 swiotlb_init(1); 547 #endif 548 549 paging_init(); 550 551 /* Initialize the MMU context management stuff */ 552 mmu_context_init(); 553 554 ppc64_boot_msg(0x15, "Setup Done"); 555 } 556 557 558 /* ToDo: do something useful if ppc_md is not yet setup. */ 559 #define PPC64_LINUX_FUNCTION 0x0f000000 560 #define PPC64_IPL_MESSAGE 0xc0000000 561 #define PPC64_TERM_MESSAGE 0xb0000000 562 563 static void ppc64_do_msg(unsigned int src, const char *msg) 564 { 565 if (ppc_md.progress) { 566 char buf[128]; 567 568 sprintf(buf, "%08X\n", src); 569 ppc_md.progress(buf, 0); 570 snprintf(buf, 128, "%s", msg); 571 ppc_md.progress(buf, 0); 572 } 573 } 574 575 /* Print a boot progress message. */ 576 void ppc64_boot_msg(unsigned int src, const char *msg) 577 { 578 ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg); 579 printk("[boot]%04x %s\n", src, msg); 580 } 581 582 void cpu_die(void) 583 { 584 if (ppc_md.cpu_die) 585 ppc_md.cpu_die(); 586 } 587 588 #ifdef CONFIG_SMP 589 #define PCPU_DYN_SIZE () 590 591 static void * __init pcpu_fc_alloc(unsigned int cpu, size_t size, size_t align) 592 { 593 return __alloc_bootmem_node(NODE_DATA(cpu_to_node(cpu)), size, align, 594 __pa(MAX_DMA_ADDRESS)); 595 } 596 597 static void __init pcpu_fc_free(void *ptr, size_t size) 598 { 599 free_bootmem(__pa(ptr), size); 600 } 601 602 static int pcpu_cpu_distance(unsigned int from, unsigned int to) 603 { 604 if (cpu_to_node(from) == cpu_to_node(to)) 605 return LOCAL_DISTANCE; 606 else 607 return REMOTE_DISTANCE; 608 } 609 610 void __init setup_per_cpu_areas(void) 611 { 612 const size_t dyn_size = PERCPU_MODULE_RESERVE + PERCPU_DYNAMIC_RESERVE; 613 size_t atom_size; 614 unsigned long delta; 615 unsigned int cpu; 616 int rc; 617 618 /* 619 * Linear mapping is one of 4K, 1M and 16M. For 4K, no need 620 * to group units. For larger mappings, use 1M atom which 621 * should be large enough to contain a number of units. 622 */ 623 if (mmu_linear_psize == MMU_PAGE_4K) 624 atom_size = PAGE_SIZE; 625 else 626 atom_size = 1 << 20; 627 628 rc = pcpu_embed_first_chunk(0, dyn_size, atom_size, pcpu_cpu_distance, 629 pcpu_fc_alloc, pcpu_fc_free); 630 if (rc < 0) 631 panic("cannot initialize percpu area (err=%d)", rc); 632 633 delta = (unsigned long)pcpu_base_addr - (unsigned long)__per_cpu_start; 634 for_each_possible_cpu(cpu) 635 paca[cpu].data_offset = delta + pcpu_unit_offsets[cpu]; 636 } 637 #endif 638 639 640 #ifdef CONFIG_PPC_INDIRECT_IO 641 struct ppc_pci_io ppc_pci_io; 642 EXPORT_SYMBOL(ppc_pci_io); 643 #endif /* CONFIG_PPC_INDIRECT_IO */ 644 645