1 /* 2 * Common boot and setup code for both 32-bit and 64-bit. 3 * Extracted from arch/powerpc/kernel/setup_64.c. 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/export.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/platform_device.h> 24 #include <linux/seq_file.h> 25 #include <linux/ioport.h> 26 #include <linux/console.h> 27 #include <linux/screen_info.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/debugfs.h> 35 #include <linux/percpu.h> 36 #include <linux/memblock.h> 37 #include <linux/of_platform.h> 38 #include <linux/hugetlb.h> 39 #include <asm/io.h> 40 #include <asm/paca.h> 41 #include <asm/prom.h> 42 #include <asm/processor.h> 43 #include <asm/vdso_datapage.h> 44 #include <asm/pgtable.h> 45 #include <asm/smp.h> 46 #include <asm/elf.h> 47 #include <asm/machdep.h> 48 #include <asm/time.h> 49 #include <asm/cputable.h> 50 #include <asm/sections.h> 51 #include <asm/firmware.h> 52 #include <asm/btext.h> 53 #include <asm/nvram.h> 54 #include <asm/setup.h> 55 #include <asm/rtas.h> 56 #include <asm/iommu.h> 57 #include <asm/serial.h> 58 #include <asm/cache.h> 59 #include <asm/page.h> 60 #include <asm/mmu.h> 61 #include <asm/xmon.h> 62 #include <asm/cputhreads.h> 63 #include <mm/mmu_decl.h> 64 #include <asm/fadump.h> 65 #include <asm/udbg.h> 66 #include <asm/hugetlb.h> 67 #include <asm/livepatch.h> 68 #include <asm/mmu_context.h> 69 #include <asm/cpu_has_feature.h> 70 71 #include "setup.h" 72 73 #ifdef DEBUG 74 #include <asm/udbg.h> 75 #define DBG(fmt...) udbg_printf(fmt) 76 #else 77 #define DBG(fmt...) 78 #endif 79 80 /* The main machine-dep calls structure 81 */ 82 struct machdep_calls ppc_md; 83 EXPORT_SYMBOL(ppc_md); 84 struct machdep_calls *machine_id; 85 EXPORT_SYMBOL(machine_id); 86 87 int boot_cpuid = -1; 88 EXPORT_SYMBOL_GPL(boot_cpuid); 89 90 unsigned long klimit = (unsigned long) _end; 91 92 /* 93 * This still seems to be needed... -- paulus 94 */ 95 struct screen_info screen_info = { 96 .orig_x = 0, 97 .orig_y = 25, 98 .orig_video_cols = 80, 99 .orig_video_lines = 25, 100 .orig_video_isVGA = 1, 101 .orig_video_points = 16 102 }; 103 #if defined(CONFIG_FB_VGA16_MODULE) 104 EXPORT_SYMBOL(screen_info); 105 #endif 106 107 /* Variables required to store legacy IO irq routing */ 108 int of_i8042_kbd_irq; 109 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); 110 int of_i8042_aux_irq; 111 EXPORT_SYMBOL_GPL(of_i8042_aux_irq); 112 113 #ifdef __DO_IRQ_CANON 114 /* XXX should go elsewhere eventually */ 115 int ppc_do_canonicalize_irqs; 116 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 117 #endif 118 119 /* also used by kexec */ 120 void machine_shutdown(void) 121 { 122 #ifdef CONFIG_FA_DUMP 123 /* 124 * if fadump is active, cleanup the fadump registration before we 125 * shutdown. 126 */ 127 fadump_cleanup(); 128 #endif 129 130 if (ppc_md.machine_shutdown) 131 ppc_md.machine_shutdown(); 132 } 133 134 void machine_restart(char *cmd) 135 { 136 machine_shutdown(); 137 if (ppc_md.restart) 138 ppc_md.restart(cmd); 139 smp_send_stop(); 140 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 141 local_irq_disable(); 142 while (1) ; 143 } 144 145 void machine_power_off(void) 146 { 147 machine_shutdown(); 148 if (pm_power_off) 149 pm_power_off(); 150 smp_send_stop(); 151 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 152 local_irq_disable(); 153 while (1) ; 154 } 155 /* Used by the G5 thermal driver */ 156 EXPORT_SYMBOL_GPL(machine_power_off); 157 158 void (*pm_power_off)(void); 159 EXPORT_SYMBOL_GPL(pm_power_off); 160 161 void machine_halt(void) 162 { 163 machine_shutdown(); 164 if (ppc_md.halt) 165 ppc_md.halt(); 166 smp_send_stop(); 167 printk(KERN_EMERG "System Halted, OK to turn off power\n"); 168 local_irq_disable(); 169 while (1) ; 170 } 171 172 173 #ifdef CONFIG_TAU 174 extern u32 cpu_temp(unsigned long cpu); 175 extern u32 cpu_temp_both(unsigned long cpu); 176 #endif /* CONFIG_TAU */ 177 178 #ifdef CONFIG_SMP 179 DEFINE_PER_CPU(unsigned int, cpu_pvr); 180 #endif 181 182 static void show_cpuinfo_summary(struct seq_file *m) 183 { 184 struct device_node *root; 185 const char *model = NULL; 186 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 187 unsigned long bogosum = 0; 188 int i; 189 for_each_online_cpu(i) 190 bogosum += loops_per_jiffy; 191 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 192 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 193 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 194 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 195 if (ppc_md.name) 196 seq_printf(m, "platform\t: %s\n", ppc_md.name); 197 root = of_find_node_by_path("/"); 198 if (root) 199 model = of_get_property(root, "model", NULL); 200 if (model) 201 seq_printf(m, "model\t\t: %s\n", model); 202 of_node_put(root); 203 204 if (ppc_md.show_cpuinfo != NULL) 205 ppc_md.show_cpuinfo(m); 206 207 #ifdef CONFIG_PPC32 208 /* Display the amount of memory */ 209 seq_printf(m, "Memory\t\t: %d MB\n", 210 (unsigned int)(total_memory / (1024 * 1024))); 211 #endif 212 } 213 214 static int show_cpuinfo(struct seq_file *m, void *v) 215 { 216 unsigned long cpu_id = (unsigned long)v - 1; 217 unsigned int pvr; 218 unsigned long proc_freq; 219 unsigned short maj; 220 unsigned short min; 221 222 /* We only show online cpus: disable preempt (overzealous, I 223 * knew) to prevent cpu going down. */ 224 preempt_disable(); 225 if (!cpu_online(cpu_id)) { 226 preempt_enable(); 227 return 0; 228 } 229 230 #ifdef CONFIG_SMP 231 pvr = per_cpu(cpu_pvr, cpu_id); 232 #else 233 pvr = mfspr(SPRN_PVR); 234 #endif 235 maj = (pvr >> 8) & 0xFF; 236 min = pvr & 0xFF; 237 238 seq_printf(m, "processor\t: %lu\n", cpu_id); 239 seq_printf(m, "cpu\t\t: "); 240 241 if (cur_cpu_spec->pvr_mask) 242 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 243 else 244 seq_printf(m, "unknown (%08x)", pvr); 245 246 #ifdef CONFIG_ALTIVEC 247 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 248 seq_printf(m, ", altivec supported"); 249 #endif /* CONFIG_ALTIVEC */ 250 251 seq_printf(m, "\n"); 252 253 #ifdef CONFIG_TAU 254 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 255 #ifdef CONFIG_TAU_AVERAGE 256 /* more straightforward, but potentially misleading */ 257 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 258 cpu_temp(cpu_id)); 259 #else 260 /* show the actual temp sensor range */ 261 u32 temp; 262 temp = cpu_temp_both(cpu_id); 263 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 264 temp & 0xff, temp >> 16); 265 #endif 266 } 267 #endif /* CONFIG_TAU */ 268 269 /* 270 * Platforms that have variable clock rates, should implement 271 * the method ppc_md.get_proc_freq() that reports the clock 272 * rate of a given cpu. The rest can use ppc_proc_freq to 273 * report the clock rate that is same across all cpus. 274 */ 275 if (ppc_md.get_proc_freq) 276 proc_freq = ppc_md.get_proc_freq(cpu_id); 277 else 278 proc_freq = ppc_proc_freq; 279 280 if (proc_freq) 281 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 282 proc_freq / 1000000, proc_freq % 1000000); 283 284 if (ppc_md.show_percpuinfo != NULL) 285 ppc_md.show_percpuinfo(m, cpu_id); 286 287 /* If we are a Freescale core do a simple check so 288 * we dont have to keep adding cases in the future */ 289 if (PVR_VER(pvr) & 0x8000) { 290 switch (PVR_VER(pvr)) { 291 case 0x8000: /* 7441/7450/7451, Voyager */ 292 case 0x8001: /* 7445/7455, Apollo 6 */ 293 case 0x8002: /* 7447/7457, Apollo 7 */ 294 case 0x8003: /* 7447A, Apollo 7 PM */ 295 case 0x8004: /* 7448, Apollo 8 */ 296 case 0x800c: /* 7410, Nitro */ 297 maj = ((pvr >> 8) & 0xF); 298 min = PVR_MIN(pvr); 299 break; 300 default: /* e500/book-e */ 301 maj = PVR_MAJ(pvr); 302 min = PVR_MIN(pvr); 303 break; 304 } 305 } else { 306 switch (PVR_VER(pvr)) { 307 case 0x0020: /* 403 family */ 308 maj = PVR_MAJ(pvr) + 1; 309 min = PVR_MIN(pvr); 310 break; 311 case 0x1008: /* 740P/750P ?? */ 312 maj = ((pvr >> 8) & 0xFF) - 1; 313 min = pvr & 0xFF; 314 break; 315 default: 316 maj = (pvr >> 8) & 0xFF; 317 min = pvr & 0xFF; 318 break; 319 } 320 } 321 322 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 323 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 324 325 #ifdef CONFIG_PPC32 326 seq_printf(m, "bogomips\t: %lu.%02lu\n", 327 loops_per_jiffy / (500000/HZ), 328 (loops_per_jiffy / (5000/HZ)) % 100); 329 #endif 330 331 #ifdef CONFIG_SMP 332 seq_printf(m, "\n"); 333 #endif 334 335 preempt_enable(); 336 337 /* If this is the last cpu, print the summary */ 338 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 339 show_cpuinfo_summary(m); 340 341 return 0; 342 } 343 344 static void *c_start(struct seq_file *m, loff_t *pos) 345 { 346 if (*pos == 0) /* just in case, cpu 0 is not the first */ 347 *pos = cpumask_first(cpu_online_mask); 348 else 349 *pos = cpumask_next(*pos - 1, cpu_online_mask); 350 if ((*pos) < nr_cpu_ids) 351 return (void *)(unsigned long)(*pos + 1); 352 return NULL; 353 } 354 355 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 356 { 357 (*pos)++; 358 return c_start(m, pos); 359 } 360 361 static void c_stop(struct seq_file *m, void *v) 362 { 363 } 364 365 const struct seq_operations cpuinfo_op = { 366 .start =c_start, 367 .next = c_next, 368 .stop = c_stop, 369 .show = show_cpuinfo, 370 }; 371 372 void __init check_for_initrd(void) 373 { 374 #ifdef CONFIG_BLK_DEV_INITRD 375 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 376 initrd_start, initrd_end); 377 378 /* If we were passed an initrd, set the ROOT_DEV properly if the values 379 * look sensible. If not, clear initrd reference. 380 */ 381 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 382 initrd_end > initrd_start) 383 ROOT_DEV = Root_RAM0; 384 else 385 initrd_start = initrd_end = 0; 386 387 if (initrd_start) 388 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 389 390 DBG(" <- check_for_initrd()\n"); 391 #endif /* CONFIG_BLK_DEV_INITRD */ 392 } 393 394 #ifdef CONFIG_SMP 395 396 int threads_per_core, threads_per_subcore, threads_shift; 397 cpumask_t threads_core_mask; 398 EXPORT_SYMBOL_GPL(threads_per_core); 399 EXPORT_SYMBOL_GPL(threads_per_subcore); 400 EXPORT_SYMBOL_GPL(threads_shift); 401 EXPORT_SYMBOL_GPL(threads_core_mask); 402 403 static void __init cpu_init_thread_core_maps(int tpc) 404 { 405 int i; 406 407 threads_per_core = tpc; 408 threads_per_subcore = tpc; 409 cpumask_clear(&threads_core_mask); 410 411 /* This implementation only supports power of 2 number of threads 412 * for simplicity and performance 413 */ 414 threads_shift = ilog2(tpc); 415 BUG_ON(tpc != (1 << threads_shift)); 416 417 for (i = 0; i < tpc; i++) 418 cpumask_set_cpu(i, &threads_core_mask); 419 420 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 421 tpc, tpc > 1 ? "s" : ""); 422 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 423 } 424 425 426 /** 427 * setup_cpu_maps - initialize the following cpu maps: 428 * cpu_possible_mask 429 * cpu_present_mask 430 * 431 * Having the possible map set up early allows us to restrict allocations 432 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 433 * 434 * We do not initialize the online map here; cpus set their own bits in 435 * cpu_online_mask as they come up. 436 * 437 * This function is valid only for Open Firmware systems. finish_device_tree 438 * must be called before using this. 439 * 440 * While we're here, we may as well set the "physical" cpu ids in the paca. 441 * 442 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 443 */ 444 void __init smp_setup_cpu_maps(void) 445 { 446 struct device_node *dn = NULL; 447 int cpu = 0; 448 int nthreads = 1; 449 450 DBG("smp_setup_cpu_maps()\n"); 451 452 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) { 453 const __be32 *intserv; 454 __be32 cpu_be; 455 int j, len; 456 457 DBG(" * %s...\n", dn->full_name); 458 459 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 460 &len); 461 if (intserv) { 462 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 463 nthreads); 464 } else { 465 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 466 intserv = of_get_property(dn, "reg", &len); 467 if (!intserv) { 468 cpu_be = cpu_to_be32(cpu); 469 intserv = &cpu_be; /* assume logical == phys */ 470 len = 4; 471 } 472 } 473 474 nthreads = len / sizeof(int); 475 476 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 477 bool avail; 478 479 DBG(" thread %d -> cpu %d (hard id %d)\n", 480 j, cpu, be32_to_cpu(intserv[j])); 481 482 avail = of_device_is_available(dn); 483 if (!avail) 484 avail = !of_property_match_string(dn, 485 "enable-method", "spin-table"); 486 487 set_cpu_present(cpu, avail); 488 set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j])); 489 set_cpu_possible(cpu, true); 490 cpu++; 491 } 492 } 493 494 /* If no SMT supported, nthreads is forced to 1 */ 495 if (!cpu_has_feature(CPU_FTR_SMT)) { 496 DBG(" SMT disabled ! nthreads forced to 1\n"); 497 nthreads = 1; 498 } 499 500 #ifdef CONFIG_PPC64 501 /* 502 * On pSeries LPAR, we need to know how many cpus 503 * could possibly be added to this partition. 504 */ 505 if (firmware_has_feature(FW_FEATURE_LPAR) && 506 (dn = of_find_node_by_path("/rtas"))) { 507 int num_addr_cell, num_size_cell, maxcpus; 508 const __be32 *ireg; 509 510 num_addr_cell = of_n_addr_cells(dn); 511 num_size_cell = of_n_size_cells(dn); 512 513 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 514 515 if (!ireg) 516 goto out; 517 518 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 519 520 /* Double maxcpus for processors which have SMT capability */ 521 if (cpu_has_feature(CPU_FTR_SMT)) 522 maxcpus *= nthreads; 523 524 if (maxcpus > nr_cpu_ids) { 525 printk(KERN_WARNING 526 "Partition configured for %d cpus, " 527 "operating system maximum is %d.\n", 528 maxcpus, nr_cpu_ids); 529 maxcpus = nr_cpu_ids; 530 } else 531 printk(KERN_INFO "Partition configured for %d cpus.\n", 532 maxcpus); 533 534 for (cpu = 0; cpu < maxcpus; cpu++) 535 set_cpu_possible(cpu, true); 536 out: 537 of_node_put(dn); 538 } 539 vdso_data->processorCount = num_present_cpus(); 540 #endif /* CONFIG_PPC64 */ 541 542 /* Initialize CPU <=> thread mapping/ 543 * 544 * WARNING: We assume that the number of threads is the same for 545 * every CPU in the system. If that is not the case, then some code 546 * here will have to be reworked 547 */ 548 cpu_init_thread_core_maps(nthreads); 549 550 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 551 setup_nr_cpu_ids(); 552 553 free_unused_pacas(); 554 } 555 #endif /* CONFIG_SMP */ 556 557 #ifdef CONFIG_PCSPKR_PLATFORM 558 static __init int add_pcspkr(void) 559 { 560 struct device_node *np; 561 struct platform_device *pd; 562 int ret; 563 564 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 565 of_node_put(np); 566 if (!np) 567 return -ENODEV; 568 569 pd = platform_device_alloc("pcspkr", -1); 570 if (!pd) 571 return -ENOMEM; 572 573 ret = platform_device_add(pd); 574 if (ret) 575 platform_device_put(pd); 576 577 return ret; 578 } 579 device_initcall(add_pcspkr); 580 #endif /* CONFIG_PCSPKR_PLATFORM */ 581 582 void probe_machine(void) 583 { 584 extern struct machdep_calls __machine_desc_start; 585 extern struct machdep_calls __machine_desc_end; 586 unsigned int i; 587 588 /* 589 * Iterate all ppc_md structures until we find the proper 590 * one for the current machine type 591 */ 592 DBG("Probing machine type ...\n"); 593 594 /* 595 * Check ppc_md is empty, if not we have a bug, ie, we setup an 596 * entry before probe_machine() which will be overwritten 597 */ 598 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 599 if (((void **)&ppc_md)[i]) { 600 printk(KERN_ERR "Entry %d in ppc_md non empty before" 601 " machine probe !\n", i); 602 } 603 } 604 605 for (machine_id = &__machine_desc_start; 606 machine_id < &__machine_desc_end; 607 machine_id++) { 608 DBG(" %s ...", machine_id->name); 609 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 610 if (ppc_md.probe()) { 611 DBG(" match !\n"); 612 break; 613 } 614 DBG("\n"); 615 } 616 /* What can we do if we didn't find ? */ 617 if (machine_id >= &__machine_desc_end) { 618 DBG("No suitable machine found !\n"); 619 for (;;); 620 } 621 622 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 623 } 624 625 /* Match a class of boards, not a specific device configuration. */ 626 int check_legacy_ioport(unsigned long base_port) 627 { 628 struct device_node *parent, *np = NULL; 629 int ret = -ENODEV; 630 631 switch(base_port) { 632 case I8042_DATA_REG: 633 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 634 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 635 if (np) { 636 parent = of_get_parent(np); 637 638 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 639 if (!of_i8042_kbd_irq) 640 of_i8042_kbd_irq = 1; 641 642 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 643 if (!of_i8042_aux_irq) 644 of_i8042_aux_irq = 12; 645 646 of_node_put(np); 647 np = parent; 648 break; 649 } 650 np = of_find_node_by_type(NULL, "8042"); 651 /* Pegasos has no device_type on its 8042 node, look for the 652 * name instead */ 653 if (!np) 654 np = of_find_node_by_name(NULL, "8042"); 655 if (np) { 656 of_i8042_kbd_irq = 1; 657 of_i8042_aux_irq = 12; 658 } 659 break; 660 case FDC_BASE: /* FDC1 */ 661 np = of_find_node_by_type(NULL, "fdc"); 662 break; 663 default: 664 /* ipmi is supposed to fail here */ 665 break; 666 } 667 if (!np) 668 return ret; 669 parent = of_get_parent(np); 670 if (parent) { 671 if (strcmp(parent->type, "isa") == 0) 672 ret = 0; 673 of_node_put(parent); 674 } 675 of_node_put(np); 676 return ret; 677 } 678 EXPORT_SYMBOL(check_legacy_ioport); 679 680 static int ppc_panic_event(struct notifier_block *this, 681 unsigned long event, void *ptr) 682 { 683 /* 684 * If firmware-assisted dump has been registered then trigger 685 * firmware-assisted dump and let firmware handle everything else. 686 */ 687 crash_fadump(NULL, ptr); 688 ppc_md.panic(ptr); /* May not return */ 689 return NOTIFY_DONE; 690 } 691 692 static struct notifier_block ppc_panic_block = { 693 .notifier_call = ppc_panic_event, 694 .priority = INT_MIN /* may not return; must be done last */ 695 }; 696 697 void __init setup_panic(void) 698 { 699 if (!ppc_md.panic) 700 return; 701 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 702 } 703 704 #ifdef CONFIG_CHECK_CACHE_COHERENCY 705 /* 706 * For platforms that have configurable cache-coherency. This function 707 * checks that the cache coherency setting of the kernel matches the setting 708 * left by the firmware, as indicated in the device tree. Since a mismatch 709 * will eventually result in DMA failures, we print * and error and call 710 * BUG() in that case. 711 */ 712 713 #ifdef CONFIG_NOT_COHERENT_CACHE 714 #define KERNEL_COHERENCY 0 715 #else 716 #define KERNEL_COHERENCY 1 717 #endif 718 719 static int __init check_cache_coherency(void) 720 { 721 struct device_node *np; 722 const void *prop; 723 int devtree_coherency; 724 725 np = of_find_node_by_path("/"); 726 prop = of_get_property(np, "coherency-off", NULL); 727 of_node_put(np); 728 729 devtree_coherency = prop ? 0 : 1; 730 731 if (devtree_coherency != KERNEL_COHERENCY) { 732 printk(KERN_ERR 733 "kernel coherency:%s != device tree_coherency:%s\n", 734 KERNEL_COHERENCY ? "on" : "off", 735 devtree_coherency ? "on" : "off"); 736 BUG(); 737 } 738 739 return 0; 740 } 741 742 late_initcall(check_cache_coherency); 743 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 744 745 #ifdef CONFIG_DEBUG_FS 746 struct dentry *powerpc_debugfs_root; 747 EXPORT_SYMBOL(powerpc_debugfs_root); 748 749 static int powerpc_debugfs_init(void) 750 { 751 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 752 753 return powerpc_debugfs_root == NULL; 754 } 755 arch_initcall(powerpc_debugfs_init); 756 #endif 757 758 void ppc_printk_progress(char *s, unsigned short hex) 759 { 760 pr_info("%s\n", s); 761 } 762 763 void arch_setup_pdev_archdata(struct platform_device *pdev) 764 { 765 pdev->archdata.dma_mask = DMA_BIT_MASK(32); 766 pdev->dev.dma_mask = &pdev->archdata.dma_mask; 767 set_dma_ops(&pdev->dev, &dma_direct_ops); 768 } 769 770 static __init void print_system_info(void) 771 { 772 pr_info("-----------------------------------------------------\n"); 773 #ifdef CONFIG_PPC_STD_MMU_64 774 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 775 #endif 776 #ifdef CONFIG_PPC_STD_MMU_32 777 pr_info("Hash_size = 0x%lx\n", Hash_size); 778 #endif 779 pr_info("phys_mem_size = 0x%llx\n", 780 (unsigned long long)memblock_phys_mem_size()); 781 782 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 783 pr_info("icache_bsize = 0x%x\n", icache_bsize); 784 if (ucache_bsize != 0) 785 pr_info("ucache_bsize = 0x%x\n", ucache_bsize); 786 787 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 788 pr_info(" possible = 0x%016lx\n", 789 (unsigned long)CPU_FTRS_POSSIBLE); 790 pr_info(" always = 0x%016lx\n", 791 (unsigned long)CPU_FTRS_ALWAYS); 792 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 793 cur_cpu_spec->cpu_user_features, 794 cur_cpu_spec->cpu_user_features2); 795 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 796 #ifdef CONFIG_PPC64 797 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 798 #endif 799 800 #ifdef CONFIG_PPC_STD_MMU_64 801 if (htab_address) 802 pr_info("htab_address = 0x%p\n", htab_address); 803 if (htab_hash_mask) 804 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask); 805 #endif 806 #ifdef CONFIG_PPC_STD_MMU_32 807 if (Hash) 808 pr_info("Hash = 0x%p\n", Hash); 809 if (Hash_mask) 810 pr_info("Hash_mask = 0x%lx\n", Hash_mask); 811 #endif 812 813 if (PHYSICAL_START > 0) 814 pr_info("physical_start = 0x%llx\n", 815 (unsigned long long)PHYSICAL_START); 816 pr_info("-----------------------------------------------------\n"); 817 } 818 819 /* 820 * Called into from start_kernel this initializes memblock, which is used 821 * to manage page allocation until mem_init is called. 822 */ 823 void __init setup_arch(char **cmdline_p) 824 { 825 *cmdline_p = boot_command_line; 826 827 /* Set a half-reasonable default so udelay does something sensible */ 828 loops_per_jiffy = 500000000 / HZ; 829 830 /* Unflatten the device-tree passed by prom_init or kexec */ 831 unflatten_device_tree(); 832 833 /* 834 * Initialize cache line/block info from device-tree (on ppc64) or 835 * just cputable (on ppc32). 836 */ 837 initialize_cache_info(); 838 839 /* Initialize RTAS if available. */ 840 rtas_initialize(); 841 842 /* Check if we have an initrd provided via the device-tree. */ 843 check_for_initrd(); 844 845 /* Probe the machine type, establish ppc_md. */ 846 probe_machine(); 847 848 /* Setup panic notifier if requested by the platform. */ 849 setup_panic(); 850 851 /* 852 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 853 * it from their respective probe() function. 854 */ 855 setup_power_save(); 856 857 /* Discover standard serial ports. */ 858 find_legacy_serial_ports(); 859 860 /* Register early console with the printk subsystem. */ 861 register_early_udbg_console(); 862 863 /* Setup the various CPU maps based on the device-tree. */ 864 smp_setup_cpu_maps(); 865 866 /* Initialize xmon. */ 867 xmon_setup(); 868 869 /* Check the SMT related command line arguments (ppc64). */ 870 check_smt_enabled(); 871 872 /* On BookE, setup per-core TLB data structures. */ 873 setup_tlb_core_data(); 874 875 /* 876 * Release secondary cpus out of their spinloops at 0x60 now that 877 * we can map physical -> logical CPU ids. 878 * 879 * Freescale Book3e parts spin in a loop provided by firmware, 880 * so smp_release_cpus() does nothing for them. 881 */ 882 #ifdef CONFIG_SMP 883 smp_release_cpus(); 884 #endif 885 886 /* Print various info about the machine that has been gathered so far. */ 887 print_system_info(); 888 889 /* Reserve large chunks of memory for use by CMA for KVM. */ 890 kvm_cma_reserve(); 891 892 /* 893 * Reserve any gigantic pages requested on the command line. 894 * memblock needs to have been initialized by the time this is 895 * called since this will reserve memory. 896 */ 897 reserve_hugetlb_gpages(); 898 899 klp_init_thread_info(&init_thread_info); 900 901 init_mm.start_code = (unsigned long)_stext; 902 init_mm.end_code = (unsigned long) _etext; 903 init_mm.end_data = (unsigned long) _edata; 904 init_mm.brk = klimit; 905 #ifdef CONFIG_PPC_64K_PAGES 906 init_mm.context.pte_frag = NULL; 907 #endif 908 #ifdef CONFIG_SPAPR_TCE_IOMMU 909 mm_iommu_init(&init_mm.context); 910 #endif 911 irqstack_early_init(); 912 exc_lvl_early_init(); 913 emergency_stack_init(); 914 915 initmem_init(); 916 917 #ifdef CONFIG_DUMMY_CONSOLE 918 conswitchp = &dummy_con; 919 #endif 920 if (ppc_md.setup_arch) 921 ppc_md.setup_arch(); 922 923 paging_init(); 924 925 /* Initialize the MMU context management stuff. */ 926 mmu_context_init(); 927 928 #ifdef CONFIG_PPC64 929 /* Interrupt code needs to be 64K-aligned. */ 930 if ((unsigned long)_stext & 0xffff) 931 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 932 (unsigned long)_stext); 933 #endif 934 } 935