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 static void machine_hang(void) 135 { 136 pr_emerg("System Halted, OK to turn off power\n"); 137 local_irq_disable(); 138 while (1) 139 ; 140 } 141 142 void machine_restart(char *cmd) 143 { 144 machine_shutdown(); 145 if (ppc_md.restart) 146 ppc_md.restart(cmd); 147 148 smp_send_stop(); 149 150 do_kernel_restart(cmd); 151 mdelay(1000); 152 153 machine_hang(); 154 } 155 156 void machine_power_off(void) 157 { 158 machine_shutdown(); 159 if (pm_power_off) 160 pm_power_off(); 161 162 smp_send_stop(); 163 machine_hang(); 164 } 165 /* Used by the G5 thermal driver */ 166 EXPORT_SYMBOL_GPL(machine_power_off); 167 168 void (*pm_power_off)(void); 169 EXPORT_SYMBOL_GPL(pm_power_off); 170 171 void machine_halt(void) 172 { 173 machine_shutdown(); 174 if (ppc_md.halt) 175 ppc_md.halt(); 176 177 smp_send_stop(); 178 machine_hang(); 179 } 180 181 182 #ifdef CONFIG_TAU 183 extern u32 cpu_temp(unsigned long cpu); 184 extern u32 cpu_temp_both(unsigned long cpu); 185 #endif /* CONFIG_TAU */ 186 187 #ifdef CONFIG_SMP 188 DEFINE_PER_CPU(unsigned int, cpu_pvr); 189 #endif 190 191 static void show_cpuinfo_summary(struct seq_file *m) 192 { 193 struct device_node *root; 194 const char *model = NULL; 195 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 196 unsigned long bogosum = 0; 197 int i; 198 for_each_online_cpu(i) 199 bogosum += loops_per_jiffy; 200 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 201 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 202 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 203 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 204 if (ppc_md.name) 205 seq_printf(m, "platform\t: %s\n", ppc_md.name); 206 root = of_find_node_by_path("/"); 207 if (root) 208 model = of_get_property(root, "model", NULL); 209 if (model) 210 seq_printf(m, "model\t\t: %s\n", model); 211 of_node_put(root); 212 213 if (ppc_md.show_cpuinfo != NULL) 214 ppc_md.show_cpuinfo(m); 215 216 #ifdef CONFIG_PPC32 217 /* Display the amount of memory */ 218 seq_printf(m, "Memory\t\t: %d MB\n", 219 (unsigned int)(total_memory / (1024 * 1024))); 220 #endif 221 } 222 223 static int show_cpuinfo(struct seq_file *m, void *v) 224 { 225 unsigned long cpu_id = (unsigned long)v - 1; 226 unsigned int pvr; 227 unsigned long proc_freq; 228 unsigned short maj; 229 unsigned short min; 230 231 /* We only show online cpus: disable preempt (overzealous, I 232 * knew) to prevent cpu going down. */ 233 preempt_disable(); 234 if (!cpu_online(cpu_id)) { 235 preempt_enable(); 236 return 0; 237 } 238 239 #ifdef CONFIG_SMP 240 pvr = per_cpu(cpu_pvr, cpu_id); 241 #else 242 pvr = mfspr(SPRN_PVR); 243 #endif 244 maj = (pvr >> 8) & 0xFF; 245 min = pvr & 0xFF; 246 247 seq_printf(m, "processor\t: %lu\n", cpu_id); 248 seq_printf(m, "cpu\t\t: "); 249 250 if (cur_cpu_spec->pvr_mask) 251 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 252 else 253 seq_printf(m, "unknown (%08x)", pvr); 254 255 #ifdef CONFIG_ALTIVEC 256 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 257 seq_printf(m, ", altivec supported"); 258 #endif /* CONFIG_ALTIVEC */ 259 260 seq_printf(m, "\n"); 261 262 #ifdef CONFIG_TAU 263 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 264 #ifdef CONFIG_TAU_AVERAGE 265 /* more straightforward, but potentially misleading */ 266 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 267 cpu_temp(cpu_id)); 268 #else 269 /* show the actual temp sensor range */ 270 u32 temp; 271 temp = cpu_temp_both(cpu_id); 272 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 273 temp & 0xff, temp >> 16); 274 #endif 275 } 276 #endif /* CONFIG_TAU */ 277 278 /* 279 * Platforms that have variable clock rates, should implement 280 * the method ppc_md.get_proc_freq() that reports the clock 281 * rate of a given cpu. The rest can use ppc_proc_freq to 282 * report the clock rate that is same across all cpus. 283 */ 284 if (ppc_md.get_proc_freq) 285 proc_freq = ppc_md.get_proc_freq(cpu_id); 286 else 287 proc_freq = ppc_proc_freq; 288 289 if (proc_freq) 290 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 291 proc_freq / 1000000, proc_freq % 1000000); 292 293 if (ppc_md.show_percpuinfo != NULL) 294 ppc_md.show_percpuinfo(m, cpu_id); 295 296 /* If we are a Freescale core do a simple check so 297 * we dont have to keep adding cases in the future */ 298 if (PVR_VER(pvr) & 0x8000) { 299 switch (PVR_VER(pvr)) { 300 case 0x8000: /* 7441/7450/7451, Voyager */ 301 case 0x8001: /* 7445/7455, Apollo 6 */ 302 case 0x8002: /* 7447/7457, Apollo 7 */ 303 case 0x8003: /* 7447A, Apollo 7 PM */ 304 case 0x8004: /* 7448, Apollo 8 */ 305 case 0x800c: /* 7410, Nitro */ 306 maj = ((pvr >> 8) & 0xF); 307 min = PVR_MIN(pvr); 308 break; 309 default: /* e500/book-e */ 310 maj = PVR_MAJ(pvr); 311 min = PVR_MIN(pvr); 312 break; 313 } 314 } else { 315 switch (PVR_VER(pvr)) { 316 case 0x0020: /* 403 family */ 317 maj = PVR_MAJ(pvr) + 1; 318 min = PVR_MIN(pvr); 319 break; 320 case 0x1008: /* 740P/750P ?? */ 321 maj = ((pvr >> 8) & 0xFF) - 1; 322 min = pvr & 0xFF; 323 break; 324 default: 325 maj = (pvr >> 8) & 0xFF; 326 min = pvr & 0xFF; 327 break; 328 } 329 } 330 331 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 332 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 333 334 #ifdef CONFIG_PPC32 335 seq_printf(m, "bogomips\t: %lu.%02lu\n", 336 loops_per_jiffy / (500000/HZ), 337 (loops_per_jiffy / (5000/HZ)) % 100); 338 #endif 339 340 #ifdef CONFIG_SMP 341 seq_printf(m, "\n"); 342 #endif 343 344 preempt_enable(); 345 346 /* If this is the last cpu, print the summary */ 347 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 348 show_cpuinfo_summary(m); 349 350 return 0; 351 } 352 353 static void *c_start(struct seq_file *m, loff_t *pos) 354 { 355 if (*pos == 0) /* just in case, cpu 0 is not the first */ 356 *pos = cpumask_first(cpu_online_mask); 357 else 358 *pos = cpumask_next(*pos - 1, cpu_online_mask); 359 if ((*pos) < nr_cpu_ids) 360 return (void *)(unsigned long)(*pos + 1); 361 return NULL; 362 } 363 364 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 365 { 366 (*pos)++; 367 return c_start(m, pos); 368 } 369 370 static void c_stop(struct seq_file *m, void *v) 371 { 372 } 373 374 const struct seq_operations cpuinfo_op = { 375 .start =c_start, 376 .next = c_next, 377 .stop = c_stop, 378 .show = show_cpuinfo, 379 }; 380 381 void __init check_for_initrd(void) 382 { 383 #ifdef CONFIG_BLK_DEV_INITRD 384 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 385 initrd_start, initrd_end); 386 387 /* If we were passed an initrd, set the ROOT_DEV properly if the values 388 * look sensible. If not, clear initrd reference. 389 */ 390 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 391 initrd_end > initrd_start) 392 ROOT_DEV = Root_RAM0; 393 else 394 initrd_start = initrd_end = 0; 395 396 if (initrd_start) 397 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 398 399 DBG(" <- check_for_initrd()\n"); 400 #endif /* CONFIG_BLK_DEV_INITRD */ 401 } 402 403 #ifdef CONFIG_SMP 404 405 int threads_per_core, threads_per_subcore, threads_shift; 406 cpumask_t threads_core_mask; 407 EXPORT_SYMBOL_GPL(threads_per_core); 408 EXPORT_SYMBOL_GPL(threads_per_subcore); 409 EXPORT_SYMBOL_GPL(threads_shift); 410 EXPORT_SYMBOL_GPL(threads_core_mask); 411 412 static void __init cpu_init_thread_core_maps(int tpc) 413 { 414 int i; 415 416 threads_per_core = tpc; 417 threads_per_subcore = tpc; 418 cpumask_clear(&threads_core_mask); 419 420 /* This implementation only supports power of 2 number of threads 421 * for simplicity and performance 422 */ 423 threads_shift = ilog2(tpc); 424 BUG_ON(tpc != (1 << threads_shift)); 425 426 for (i = 0; i < tpc; i++) 427 cpumask_set_cpu(i, &threads_core_mask); 428 429 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 430 tpc, tpc > 1 ? "s" : ""); 431 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 432 } 433 434 435 /** 436 * setup_cpu_maps - initialize the following cpu maps: 437 * cpu_possible_mask 438 * cpu_present_mask 439 * 440 * Having the possible map set up early allows us to restrict allocations 441 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 442 * 443 * We do not initialize the online map here; cpus set their own bits in 444 * cpu_online_mask as they come up. 445 * 446 * This function is valid only for Open Firmware systems. finish_device_tree 447 * must be called before using this. 448 * 449 * While we're here, we may as well set the "physical" cpu ids in the paca. 450 * 451 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 452 */ 453 void __init smp_setup_cpu_maps(void) 454 { 455 struct device_node *dn = NULL; 456 int cpu = 0; 457 int nthreads = 1; 458 459 DBG("smp_setup_cpu_maps()\n"); 460 461 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) { 462 const __be32 *intserv; 463 __be32 cpu_be; 464 int j, len; 465 466 DBG(" * %s...\n", dn->full_name); 467 468 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 469 &len); 470 if (intserv) { 471 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 472 nthreads); 473 } else { 474 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 475 intserv = of_get_property(dn, "reg", &len); 476 if (!intserv) { 477 cpu_be = cpu_to_be32(cpu); 478 intserv = &cpu_be; /* assume logical == phys */ 479 len = 4; 480 } 481 } 482 483 nthreads = len / sizeof(int); 484 485 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 486 bool avail; 487 488 DBG(" thread %d -> cpu %d (hard id %d)\n", 489 j, cpu, be32_to_cpu(intserv[j])); 490 491 avail = of_device_is_available(dn); 492 if (!avail) 493 avail = !of_property_match_string(dn, 494 "enable-method", "spin-table"); 495 496 set_cpu_present(cpu, avail); 497 set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j])); 498 set_cpu_possible(cpu, true); 499 cpu++; 500 } 501 } 502 503 /* If no SMT supported, nthreads is forced to 1 */ 504 if (!cpu_has_feature(CPU_FTR_SMT)) { 505 DBG(" SMT disabled ! nthreads forced to 1\n"); 506 nthreads = 1; 507 } 508 509 #ifdef CONFIG_PPC64 510 /* 511 * On pSeries LPAR, we need to know how many cpus 512 * could possibly be added to this partition. 513 */ 514 if (firmware_has_feature(FW_FEATURE_LPAR) && 515 (dn = of_find_node_by_path("/rtas"))) { 516 int num_addr_cell, num_size_cell, maxcpus; 517 const __be32 *ireg; 518 519 num_addr_cell = of_n_addr_cells(dn); 520 num_size_cell = of_n_size_cells(dn); 521 522 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 523 524 if (!ireg) 525 goto out; 526 527 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 528 529 /* Double maxcpus for processors which have SMT capability */ 530 if (cpu_has_feature(CPU_FTR_SMT)) 531 maxcpus *= nthreads; 532 533 if (maxcpus > nr_cpu_ids) { 534 printk(KERN_WARNING 535 "Partition configured for %d cpus, " 536 "operating system maximum is %d.\n", 537 maxcpus, nr_cpu_ids); 538 maxcpus = nr_cpu_ids; 539 } else 540 printk(KERN_INFO "Partition configured for %d cpus.\n", 541 maxcpus); 542 543 for (cpu = 0; cpu < maxcpus; cpu++) 544 set_cpu_possible(cpu, true); 545 out: 546 of_node_put(dn); 547 } 548 vdso_data->processorCount = num_present_cpus(); 549 #endif /* CONFIG_PPC64 */ 550 551 /* Initialize CPU <=> thread mapping/ 552 * 553 * WARNING: We assume that the number of threads is the same for 554 * every CPU in the system. If that is not the case, then some code 555 * here will have to be reworked 556 */ 557 cpu_init_thread_core_maps(nthreads); 558 559 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 560 setup_nr_cpu_ids(); 561 562 free_unused_pacas(); 563 } 564 #endif /* CONFIG_SMP */ 565 566 #ifdef CONFIG_PCSPKR_PLATFORM 567 static __init int add_pcspkr(void) 568 { 569 struct device_node *np; 570 struct platform_device *pd; 571 int ret; 572 573 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 574 of_node_put(np); 575 if (!np) 576 return -ENODEV; 577 578 pd = platform_device_alloc("pcspkr", -1); 579 if (!pd) 580 return -ENOMEM; 581 582 ret = platform_device_add(pd); 583 if (ret) 584 platform_device_put(pd); 585 586 return ret; 587 } 588 device_initcall(add_pcspkr); 589 #endif /* CONFIG_PCSPKR_PLATFORM */ 590 591 void probe_machine(void) 592 { 593 extern struct machdep_calls __machine_desc_start; 594 extern struct machdep_calls __machine_desc_end; 595 unsigned int i; 596 597 /* 598 * Iterate all ppc_md structures until we find the proper 599 * one for the current machine type 600 */ 601 DBG("Probing machine type ...\n"); 602 603 /* 604 * Check ppc_md is empty, if not we have a bug, ie, we setup an 605 * entry before probe_machine() which will be overwritten 606 */ 607 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 608 if (((void **)&ppc_md)[i]) { 609 printk(KERN_ERR "Entry %d in ppc_md non empty before" 610 " machine probe !\n", i); 611 } 612 } 613 614 for (machine_id = &__machine_desc_start; 615 machine_id < &__machine_desc_end; 616 machine_id++) { 617 DBG(" %s ...", machine_id->name); 618 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 619 if (ppc_md.probe()) { 620 DBG(" match !\n"); 621 break; 622 } 623 DBG("\n"); 624 } 625 /* What can we do if we didn't find ? */ 626 if (machine_id >= &__machine_desc_end) { 627 DBG("No suitable machine found !\n"); 628 for (;;); 629 } 630 631 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 632 } 633 634 /* Match a class of boards, not a specific device configuration. */ 635 int check_legacy_ioport(unsigned long base_port) 636 { 637 struct device_node *parent, *np = NULL; 638 int ret = -ENODEV; 639 640 switch(base_port) { 641 case I8042_DATA_REG: 642 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 643 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 644 if (np) { 645 parent = of_get_parent(np); 646 647 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 648 if (!of_i8042_kbd_irq) 649 of_i8042_kbd_irq = 1; 650 651 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 652 if (!of_i8042_aux_irq) 653 of_i8042_aux_irq = 12; 654 655 of_node_put(np); 656 np = parent; 657 break; 658 } 659 np = of_find_node_by_type(NULL, "8042"); 660 /* Pegasos has no device_type on its 8042 node, look for the 661 * name instead */ 662 if (!np) 663 np = of_find_node_by_name(NULL, "8042"); 664 if (np) { 665 of_i8042_kbd_irq = 1; 666 of_i8042_aux_irq = 12; 667 } 668 break; 669 case FDC_BASE: /* FDC1 */ 670 np = of_find_node_by_type(NULL, "fdc"); 671 break; 672 default: 673 /* ipmi is supposed to fail here */ 674 break; 675 } 676 if (!np) 677 return ret; 678 parent = of_get_parent(np); 679 if (parent) { 680 if (strcmp(parent->type, "isa") == 0) 681 ret = 0; 682 of_node_put(parent); 683 } 684 of_node_put(np); 685 return ret; 686 } 687 EXPORT_SYMBOL(check_legacy_ioport); 688 689 static int ppc_panic_event(struct notifier_block *this, 690 unsigned long event, void *ptr) 691 { 692 /* 693 * If firmware-assisted dump has been registered then trigger 694 * firmware-assisted dump and let firmware handle everything else. 695 */ 696 crash_fadump(NULL, ptr); 697 ppc_md.panic(ptr); /* May not return */ 698 return NOTIFY_DONE; 699 } 700 701 static struct notifier_block ppc_panic_block = { 702 .notifier_call = ppc_panic_event, 703 .priority = INT_MIN /* may not return; must be done last */ 704 }; 705 706 void __init setup_panic(void) 707 { 708 if (!ppc_md.panic) 709 return; 710 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 711 } 712 713 #ifdef CONFIG_CHECK_CACHE_COHERENCY 714 /* 715 * For platforms that have configurable cache-coherency. This function 716 * checks that the cache coherency setting of the kernel matches the setting 717 * left by the firmware, as indicated in the device tree. Since a mismatch 718 * will eventually result in DMA failures, we print * and error and call 719 * BUG() in that case. 720 */ 721 722 #ifdef CONFIG_NOT_COHERENT_CACHE 723 #define KERNEL_COHERENCY 0 724 #else 725 #define KERNEL_COHERENCY 1 726 #endif 727 728 static int __init check_cache_coherency(void) 729 { 730 struct device_node *np; 731 const void *prop; 732 int devtree_coherency; 733 734 np = of_find_node_by_path("/"); 735 prop = of_get_property(np, "coherency-off", NULL); 736 of_node_put(np); 737 738 devtree_coherency = prop ? 0 : 1; 739 740 if (devtree_coherency != KERNEL_COHERENCY) { 741 printk(KERN_ERR 742 "kernel coherency:%s != device tree_coherency:%s\n", 743 KERNEL_COHERENCY ? "on" : "off", 744 devtree_coherency ? "on" : "off"); 745 BUG(); 746 } 747 748 return 0; 749 } 750 751 late_initcall(check_cache_coherency); 752 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 753 754 #ifdef CONFIG_DEBUG_FS 755 struct dentry *powerpc_debugfs_root; 756 EXPORT_SYMBOL(powerpc_debugfs_root); 757 758 static int powerpc_debugfs_init(void) 759 { 760 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 761 762 return powerpc_debugfs_root == NULL; 763 } 764 arch_initcall(powerpc_debugfs_init); 765 #endif 766 767 void ppc_printk_progress(char *s, unsigned short hex) 768 { 769 pr_info("%s\n", s); 770 } 771 772 void arch_setup_pdev_archdata(struct platform_device *pdev) 773 { 774 pdev->archdata.dma_mask = DMA_BIT_MASK(32); 775 pdev->dev.dma_mask = &pdev->archdata.dma_mask; 776 set_dma_ops(&pdev->dev, &dma_direct_ops); 777 } 778 779 static __init void print_system_info(void) 780 { 781 pr_info("-----------------------------------------------------\n"); 782 #ifdef CONFIG_PPC_STD_MMU_64 783 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 784 #endif 785 #ifdef CONFIG_PPC_STD_MMU_32 786 pr_info("Hash_size = 0x%lx\n", Hash_size); 787 #endif 788 pr_info("phys_mem_size = 0x%llx\n", 789 (unsigned long long)memblock_phys_mem_size()); 790 791 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 792 pr_info("icache_bsize = 0x%x\n", icache_bsize); 793 if (ucache_bsize != 0) 794 pr_info("ucache_bsize = 0x%x\n", ucache_bsize); 795 796 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 797 pr_info(" possible = 0x%016lx\n", 798 (unsigned long)CPU_FTRS_POSSIBLE); 799 pr_info(" always = 0x%016lx\n", 800 (unsigned long)CPU_FTRS_ALWAYS); 801 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 802 cur_cpu_spec->cpu_user_features, 803 cur_cpu_spec->cpu_user_features2); 804 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 805 #ifdef CONFIG_PPC64 806 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 807 #endif 808 809 #ifdef CONFIG_PPC_STD_MMU_64 810 if (htab_address) 811 pr_info("htab_address = 0x%p\n", htab_address); 812 if (htab_hash_mask) 813 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask); 814 #endif 815 #ifdef CONFIG_PPC_STD_MMU_32 816 if (Hash) 817 pr_info("Hash = 0x%p\n", Hash); 818 if (Hash_mask) 819 pr_info("Hash_mask = 0x%lx\n", Hash_mask); 820 #endif 821 822 if (PHYSICAL_START > 0) 823 pr_info("physical_start = 0x%llx\n", 824 (unsigned long long)PHYSICAL_START); 825 pr_info("-----------------------------------------------------\n"); 826 } 827 828 /* 829 * Called into from start_kernel this initializes memblock, which is used 830 * to manage page allocation until mem_init is called. 831 */ 832 void __init setup_arch(char **cmdline_p) 833 { 834 *cmdline_p = boot_command_line; 835 836 /* Set a half-reasonable default so udelay does something sensible */ 837 loops_per_jiffy = 500000000 / HZ; 838 839 /* Unflatten the device-tree passed by prom_init or kexec */ 840 unflatten_device_tree(); 841 842 /* 843 * Initialize cache line/block info from device-tree (on ppc64) or 844 * just cputable (on ppc32). 845 */ 846 initialize_cache_info(); 847 848 /* Initialize RTAS if available. */ 849 rtas_initialize(); 850 851 /* Check if we have an initrd provided via the device-tree. */ 852 check_for_initrd(); 853 854 /* Probe the machine type, establish ppc_md. */ 855 probe_machine(); 856 857 /* Setup panic notifier if requested by the platform. */ 858 setup_panic(); 859 860 /* 861 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 862 * it from their respective probe() function. 863 */ 864 setup_power_save(); 865 866 /* Discover standard serial ports. */ 867 find_legacy_serial_ports(); 868 869 /* Register early console with the printk subsystem. */ 870 register_early_udbg_console(); 871 872 /* Setup the various CPU maps based on the device-tree. */ 873 smp_setup_cpu_maps(); 874 875 /* Initialize xmon. */ 876 xmon_setup(); 877 878 /* Check the SMT related command line arguments (ppc64). */ 879 check_smt_enabled(); 880 881 /* On BookE, setup per-core TLB data structures. */ 882 setup_tlb_core_data(); 883 884 /* 885 * Release secondary cpus out of their spinloops at 0x60 now that 886 * we can map physical -> logical CPU ids. 887 * 888 * Freescale Book3e parts spin in a loop provided by firmware, 889 * so smp_release_cpus() does nothing for them. 890 */ 891 #ifdef CONFIG_SMP 892 smp_release_cpus(); 893 #endif 894 895 /* Print various info about the machine that has been gathered so far. */ 896 print_system_info(); 897 898 /* Reserve large chunks of memory for use by CMA for KVM. */ 899 kvm_cma_reserve(); 900 901 /* 902 * Reserve any gigantic pages requested on the command line. 903 * memblock needs to have been initialized by the time this is 904 * called since this will reserve memory. 905 */ 906 reserve_hugetlb_gpages(); 907 908 klp_init_thread_info(&init_thread_info); 909 910 init_mm.start_code = (unsigned long)_stext; 911 init_mm.end_code = (unsigned long) _etext; 912 init_mm.end_data = (unsigned long) _edata; 913 init_mm.brk = klimit; 914 #ifdef CONFIG_PPC_64K_PAGES 915 init_mm.context.pte_frag = NULL; 916 #endif 917 #ifdef CONFIG_SPAPR_TCE_IOMMU 918 mm_iommu_init(&init_mm.context); 919 #endif 920 irqstack_early_init(); 921 exc_lvl_early_init(); 922 emergency_stack_init(); 923 924 initmem_init(); 925 926 #ifdef CONFIG_DUMMY_CONSOLE 927 conswitchp = &dummy_con; 928 #endif 929 if (ppc_md.setup_arch) 930 ppc_md.setup_arch(); 931 932 paging_init(); 933 934 /* Initialize the MMU context management stuff. */ 935 mmu_context_init(); 936 937 #ifdef CONFIG_PPC64 938 /* Interrupt code needs to be 64K-aligned. */ 939 if ((unsigned long)_stext & 0xffff) 940 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 941 (unsigned long)_stext); 942 #endif 943 } 944