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 /* 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 99 unsigned long klimit = (unsigned long) _end; 100 101 /* 102 * This still seems to be needed... -- paulus 103 */ 104 struct screen_info screen_info = { 105 .orig_x = 0, 106 .orig_y = 25, 107 .orig_video_cols = 80, 108 .orig_video_lines = 25, 109 .orig_video_isVGA = 1, 110 .orig_video_points = 16 111 }; 112 #if defined(CONFIG_FB_VGA16_MODULE) 113 EXPORT_SYMBOL(screen_info); 114 #endif 115 116 /* Variables required to store legacy IO irq routing */ 117 int of_i8042_kbd_irq; 118 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); 119 int of_i8042_aux_irq; 120 EXPORT_SYMBOL_GPL(of_i8042_aux_irq); 121 122 #ifdef __DO_IRQ_CANON 123 /* XXX should go elsewhere eventually */ 124 int ppc_do_canonicalize_irqs; 125 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 126 #endif 127 128 /* also used by kexec */ 129 void machine_shutdown(void) 130 { 131 #ifdef CONFIG_FA_DUMP 132 /* 133 * if fadump is active, cleanup the fadump registration before we 134 * shutdown. 135 */ 136 fadump_cleanup(); 137 #endif 138 139 if (ppc_md.machine_shutdown) 140 ppc_md.machine_shutdown(); 141 } 142 143 static void machine_hang(void) 144 { 145 pr_emerg("System Halted, OK to turn off power\n"); 146 local_irq_disable(); 147 while (1) 148 ; 149 } 150 151 void machine_restart(char *cmd) 152 { 153 machine_shutdown(); 154 if (ppc_md.restart) 155 ppc_md.restart(cmd); 156 157 smp_send_stop(); 158 159 do_kernel_restart(cmd); 160 mdelay(1000); 161 162 machine_hang(); 163 } 164 165 void machine_power_off(void) 166 { 167 machine_shutdown(); 168 if (pm_power_off) 169 pm_power_off(); 170 171 smp_send_stop(); 172 machine_hang(); 173 } 174 /* Used by the G5 thermal driver */ 175 EXPORT_SYMBOL_GPL(machine_power_off); 176 177 void (*pm_power_off)(void); 178 EXPORT_SYMBOL_GPL(pm_power_off); 179 180 void machine_halt(void) 181 { 182 machine_shutdown(); 183 if (ppc_md.halt) 184 ppc_md.halt(); 185 186 smp_send_stop(); 187 machine_hang(); 188 } 189 190 191 #ifdef CONFIG_TAU 192 extern u32 cpu_temp(unsigned long cpu); 193 extern u32 cpu_temp_both(unsigned long cpu); 194 #endif /* CONFIG_TAU */ 195 196 #ifdef CONFIG_SMP 197 DEFINE_PER_CPU(unsigned int, cpu_pvr); 198 #endif 199 200 static void show_cpuinfo_summary(struct seq_file *m) 201 { 202 struct device_node *root; 203 const char *model = NULL; 204 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 205 unsigned long bogosum = 0; 206 int i; 207 for_each_online_cpu(i) 208 bogosum += loops_per_jiffy; 209 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 210 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 211 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 212 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 213 if (ppc_md.name) 214 seq_printf(m, "platform\t: %s\n", ppc_md.name); 215 root = of_find_node_by_path("/"); 216 if (root) 217 model = of_get_property(root, "model", NULL); 218 if (model) 219 seq_printf(m, "model\t\t: %s\n", model); 220 of_node_put(root); 221 222 if (ppc_md.show_cpuinfo != NULL) 223 ppc_md.show_cpuinfo(m); 224 225 #ifdef CONFIG_PPC32 226 /* Display the amount of memory */ 227 seq_printf(m, "Memory\t\t: %d MB\n", 228 (unsigned int)(total_memory / (1024 * 1024))); 229 #endif 230 } 231 232 static int show_cpuinfo(struct seq_file *m, void *v) 233 { 234 unsigned long cpu_id = (unsigned long)v - 1; 235 unsigned int pvr; 236 unsigned long proc_freq; 237 unsigned short maj; 238 unsigned short min; 239 240 /* We only show online cpus: disable preempt (overzealous, I 241 * knew) to prevent cpu going down. */ 242 preempt_disable(); 243 if (!cpu_online(cpu_id)) { 244 preempt_enable(); 245 return 0; 246 } 247 248 #ifdef CONFIG_SMP 249 pvr = per_cpu(cpu_pvr, cpu_id); 250 #else 251 pvr = mfspr(SPRN_PVR); 252 #endif 253 maj = (pvr >> 8) & 0xFF; 254 min = pvr & 0xFF; 255 256 seq_printf(m, "processor\t: %lu\n", cpu_id); 257 seq_printf(m, "cpu\t\t: "); 258 259 if (cur_cpu_spec->pvr_mask) 260 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 261 else 262 seq_printf(m, "unknown (%08x)", pvr); 263 264 #ifdef CONFIG_ALTIVEC 265 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 266 seq_printf(m, ", altivec supported"); 267 #endif /* CONFIG_ALTIVEC */ 268 269 seq_printf(m, "\n"); 270 271 #ifdef CONFIG_TAU 272 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 273 #ifdef CONFIG_TAU_AVERAGE 274 /* more straightforward, but potentially misleading */ 275 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 276 cpu_temp(cpu_id)); 277 #else 278 /* show the actual temp sensor range */ 279 u32 temp; 280 temp = cpu_temp_both(cpu_id); 281 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 282 temp & 0xff, temp >> 16); 283 #endif 284 } 285 #endif /* CONFIG_TAU */ 286 287 /* 288 * Platforms that have variable clock rates, should implement 289 * the method ppc_md.get_proc_freq() that reports the clock 290 * rate of a given cpu. The rest can use ppc_proc_freq to 291 * report the clock rate that is same across all cpus. 292 */ 293 if (ppc_md.get_proc_freq) 294 proc_freq = ppc_md.get_proc_freq(cpu_id); 295 else 296 proc_freq = ppc_proc_freq; 297 298 if (proc_freq) 299 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 300 proc_freq / 1000000, proc_freq % 1000000); 301 302 if (ppc_md.show_percpuinfo != NULL) 303 ppc_md.show_percpuinfo(m, cpu_id); 304 305 /* If we are a Freescale core do a simple check so 306 * we dont have to keep adding cases in the future */ 307 if (PVR_VER(pvr) & 0x8000) { 308 switch (PVR_VER(pvr)) { 309 case 0x8000: /* 7441/7450/7451, Voyager */ 310 case 0x8001: /* 7445/7455, Apollo 6 */ 311 case 0x8002: /* 7447/7457, Apollo 7 */ 312 case 0x8003: /* 7447A, Apollo 7 PM */ 313 case 0x8004: /* 7448, Apollo 8 */ 314 case 0x800c: /* 7410, Nitro */ 315 maj = ((pvr >> 8) & 0xF); 316 min = PVR_MIN(pvr); 317 break; 318 default: /* e500/book-e */ 319 maj = PVR_MAJ(pvr); 320 min = PVR_MIN(pvr); 321 break; 322 } 323 } else { 324 switch (PVR_VER(pvr)) { 325 case 0x0020: /* 403 family */ 326 maj = PVR_MAJ(pvr) + 1; 327 min = PVR_MIN(pvr); 328 break; 329 case 0x1008: /* 740P/750P ?? */ 330 maj = ((pvr >> 8) & 0xFF) - 1; 331 min = pvr & 0xFF; 332 break; 333 default: 334 maj = (pvr >> 8) & 0xFF; 335 min = pvr & 0xFF; 336 break; 337 } 338 } 339 340 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 341 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 342 343 #ifdef CONFIG_PPC32 344 seq_printf(m, "bogomips\t: %lu.%02lu\n", 345 loops_per_jiffy / (500000/HZ), 346 (loops_per_jiffy / (5000/HZ)) % 100); 347 #endif 348 349 #ifdef CONFIG_SMP 350 seq_printf(m, "\n"); 351 #endif 352 353 preempt_enable(); 354 355 /* If this is the last cpu, print the summary */ 356 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 357 show_cpuinfo_summary(m); 358 359 return 0; 360 } 361 362 static void *c_start(struct seq_file *m, loff_t *pos) 363 { 364 if (*pos == 0) /* just in case, cpu 0 is not the first */ 365 *pos = cpumask_first(cpu_online_mask); 366 else 367 *pos = cpumask_next(*pos - 1, cpu_online_mask); 368 if ((*pos) < nr_cpu_ids) 369 return (void *)(unsigned long)(*pos + 1); 370 return NULL; 371 } 372 373 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 374 { 375 (*pos)++; 376 return c_start(m, pos); 377 } 378 379 static void c_stop(struct seq_file *m, void *v) 380 { 381 } 382 383 const struct seq_operations cpuinfo_op = { 384 .start =c_start, 385 .next = c_next, 386 .stop = c_stop, 387 .show = show_cpuinfo, 388 }; 389 390 void __init check_for_initrd(void) 391 { 392 #ifdef CONFIG_BLK_DEV_INITRD 393 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 394 initrd_start, initrd_end); 395 396 /* If we were passed an initrd, set the ROOT_DEV properly if the values 397 * look sensible. If not, clear initrd reference. 398 */ 399 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 400 initrd_end > initrd_start) 401 ROOT_DEV = Root_RAM0; 402 else 403 initrd_start = initrd_end = 0; 404 405 if (initrd_start) 406 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 407 408 DBG(" <- check_for_initrd()\n"); 409 #endif /* CONFIG_BLK_DEV_INITRD */ 410 } 411 412 #ifdef CONFIG_SMP 413 414 int threads_per_core, threads_per_subcore, threads_shift; 415 cpumask_t threads_core_mask; 416 EXPORT_SYMBOL_GPL(threads_per_core); 417 EXPORT_SYMBOL_GPL(threads_per_subcore); 418 EXPORT_SYMBOL_GPL(threads_shift); 419 EXPORT_SYMBOL_GPL(threads_core_mask); 420 421 static void __init cpu_init_thread_core_maps(int tpc) 422 { 423 int i; 424 425 threads_per_core = tpc; 426 threads_per_subcore = tpc; 427 cpumask_clear(&threads_core_mask); 428 429 /* This implementation only supports power of 2 number of threads 430 * for simplicity and performance 431 */ 432 threads_shift = ilog2(tpc); 433 BUG_ON(tpc != (1 << threads_shift)); 434 435 for (i = 0; i < tpc; i++) 436 cpumask_set_cpu(i, &threads_core_mask); 437 438 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 439 tpc, tpc > 1 ? "s" : ""); 440 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 441 } 442 443 444 /** 445 * setup_cpu_maps - initialize the following cpu maps: 446 * cpu_possible_mask 447 * cpu_present_mask 448 * 449 * Having the possible map set up early allows us to restrict allocations 450 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 451 * 452 * We do not initialize the online map here; cpus set their own bits in 453 * cpu_online_mask as they come up. 454 * 455 * This function is valid only for Open Firmware systems. finish_device_tree 456 * must be called before using this. 457 * 458 * While we're here, we may as well set the "physical" cpu ids in the paca. 459 * 460 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 461 */ 462 void __init smp_setup_cpu_maps(void) 463 { 464 struct device_node *dn = NULL; 465 int cpu = 0; 466 int nthreads = 1; 467 468 DBG("smp_setup_cpu_maps()\n"); 469 470 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) { 471 const __be32 *intserv; 472 __be32 cpu_be; 473 int j, len; 474 475 DBG(" * %s...\n", dn->full_name); 476 477 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 478 &len); 479 if (intserv) { 480 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 481 nthreads); 482 } else { 483 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 484 intserv = of_get_property(dn, "reg", &len); 485 if (!intserv) { 486 cpu_be = cpu_to_be32(cpu); 487 intserv = &cpu_be; /* assume logical == phys */ 488 len = 4; 489 } 490 } 491 492 nthreads = len / sizeof(int); 493 494 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 495 bool avail; 496 497 DBG(" thread %d -> cpu %d (hard id %d)\n", 498 j, cpu, be32_to_cpu(intserv[j])); 499 500 avail = of_device_is_available(dn); 501 if (!avail) 502 avail = !of_property_match_string(dn, 503 "enable-method", "spin-table"); 504 505 set_cpu_present(cpu, avail); 506 set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j])); 507 set_cpu_possible(cpu, true); 508 cpu++; 509 } 510 } 511 512 /* If no SMT supported, nthreads is forced to 1 */ 513 if (!cpu_has_feature(CPU_FTR_SMT)) { 514 DBG(" SMT disabled ! nthreads forced to 1\n"); 515 nthreads = 1; 516 } 517 518 #ifdef CONFIG_PPC64 519 /* 520 * On pSeries LPAR, we need to know how many cpus 521 * could possibly be added to this partition. 522 */ 523 if (firmware_has_feature(FW_FEATURE_LPAR) && 524 (dn = of_find_node_by_path("/rtas"))) { 525 int num_addr_cell, num_size_cell, maxcpus; 526 const __be32 *ireg; 527 528 num_addr_cell = of_n_addr_cells(dn); 529 num_size_cell = of_n_size_cells(dn); 530 531 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 532 533 if (!ireg) 534 goto out; 535 536 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 537 538 /* Double maxcpus for processors which have SMT capability */ 539 if (cpu_has_feature(CPU_FTR_SMT)) 540 maxcpus *= nthreads; 541 542 if (maxcpus > nr_cpu_ids) { 543 printk(KERN_WARNING 544 "Partition configured for %d cpus, " 545 "operating system maximum is %d.\n", 546 maxcpus, nr_cpu_ids); 547 maxcpus = nr_cpu_ids; 548 } else 549 printk(KERN_INFO "Partition configured for %d cpus.\n", 550 maxcpus); 551 552 for (cpu = 0; cpu < maxcpus; cpu++) 553 set_cpu_possible(cpu, true); 554 out: 555 of_node_put(dn); 556 } 557 vdso_data->processorCount = num_present_cpus(); 558 #endif /* CONFIG_PPC64 */ 559 560 /* Initialize CPU <=> thread mapping/ 561 * 562 * WARNING: We assume that the number of threads is the same for 563 * every CPU in the system. If that is not the case, then some code 564 * here will have to be reworked 565 */ 566 cpu_init_thread_core_maps(nthreads); 567 568 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 569 setup_nr_cpu_ids(); 570 571 free_unused_pacas(); 572 } 573 #endif /* CONFIG_SMP */ 574 575 #ifdef CONFIG_PCSPKR_PLATFORM 576 static __init int add_pcspkr(void) 577 { 578 struct device_node *np; 579 struct platform_device *pd; 580 int ret; 581 582 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 583 of_node_put(np); 584 if (!np) 585 return -ENODEV; 586 587 pd = platform_device_alloc("pcspkr", -1); 588 if (!pd) 589 return -ENOMEM; 590 591 ret = platform_device_add(pd); 592 if (ret) 593 platform_device_put(pd); 594 595 return ret; 596 } 597 device_initcall(add_pcspkr); 598 #endif /* CONFIG_PCSPKR_PLATFORM */ 599 600 void probe_machine(void) 601 { 602 extern struct machdep_calls __machine_desc_start; 603 extern struct machdep_calls __machine_desc_end; 604 unsigned int i; 605 606 /* 607 * Iterate all ppc_md structures until we find the proper 608 * one for the current machine type 609 */ 610 DBG("Probing machine type ...\n"); 611 612 /* 613 * Check ppc_md is empty, if not we have a bug, ie, we setup an 614 * entry before probe_machine() which will be overwritten 615 */ 616 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 617 if (((void **)&ppc_md)[i]) { 618 printk(KERN_ERR "Entry %d in ppc_md non empty before" 619 " machine probe !\n", i); 620 } 621 } 622 623 for (machine_id = &__machine_desc_start; 624 machine_id < &__machine_desc_end; 625 machine_id++) { 626 DBG(" %s ...", machine_id->name); 627 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 628 if (ppc_md.probe()) { 629 DBG(" match !\n"); 630 break; 631 } 632 DBG("\n"); 633 } 634 /* What can we do if we didn't find ? */ 635 if (machine_id >= &__machine_desc_end) { 636 DBG("No suitable machine found !\n"); 637 for (;;); 638 } 639 640 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 641 } 642 643 /* Match a class of boards, not a specific device configuration. */ 644 int check_legacy_ioport(unsigned long base_port) 645 { 646 struct device_node *parent, *np = NULL; 647 int ret = -ENODEV; 648 649 switch(base_port) { 650 case I8042_DATA_REG: 651 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 652 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 653 if (np) { 654 parent = of_get_parent(np); 655 656 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 657 if (!of_i8042_kbd_irq) 658 of_i8042_kbd_irq = 1; 659 660 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 661 if (!of_i8042_aux_irq) 662 of_i8042_aux_irq = 12; 663 664 of_node_put(np); 665 np = parent; 666 break; 667 } 668 np = of_find_node_by_type(NULL, "8042"); 669 /* Pegasos has no device_type on its 8042 node, look for the 670 * name instead */ 671 if (!np) 672 np = of_find_node_by_name(NULL, "8042"); 673 if (np) { 674 of_i8042_kbd_irq = 1; 675 of_i8042_aux_irq = 12; 676 } 677 break; 678 case FDC_BASE: /* FDC1 */ 679 np = of_find_node_by_type(NULL, "fdc"); 680 break; 681 default: 682 /* ipmi is supposed to fail here */ 683 break; 684 } 685 if (!np) 686 return ret; 687 parent = of_get_parent(np); 688 if (parent) { 689 if (strcmp(parent->type, "isa") == 0) 690 ret = 0; 691 of_node_put(parent); 692 } 693 of_node_put(np); 694 return ret; 695 } 696 EXPORT_SYMBOL(check_legacy_ioport); 697 698 static int ppc_panic_event(struct notifier_block *this, 699 unsigned long event, void *ptr) 700 { 701 /* 702 * If firmware-assisted dump has been registered then trigger 703 * firmware-assisted dump and let firmware handle everything else. 704 */ 705 crash_fadump(NULL, ptr); 706 ppc_md.panic(ptr); /* May not return */ 707 return NOTIFY_DONE; 708 } 709 710 static struct notifier_block ppc_panic_block = { 711 .notifier_call = ppc_panic_event, 712 .priority = INT_MIN /* may not return; must be done last */ 713 }; 714 715 void __init setup_panic(void) 716 { 717 if (!ppc_md.panic) 718 return; 719 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 720 } 721 722 #ifdef CONFIG_CHECK_CACHE_COHERENCY 723 /* 724 * For platforms that have configurable cache-coherency. This function 725 * checks that the cache coherency setting of the kernel matches the setting 726 * left by the firmware, as indicated in the device tree. Since a mismatch 727 * will eventually result in DMA failures, we print * and error and call 728 * BUG() in that case. 729 */ 730 731 #ifdef CONFIG_NOT_COHERENT_CACHE 732 #define KERNEL_COHERENCY 0 733 #else 734 #define KERNEL_COHERENCY 1 735 #endif 736 737 static int __init check_cache_coherency(void) 738 { 739 struct device_node *np; 740 const void *prop; 741 int devtree_coherency; 742 743 np = of_find_node_by_path("/"); 744 prop = of_get_property(np, "coherency-off", NULL); 745 of_node_put(np); 746 747 devtree_coherency = prop ? 0 : 1; 748 749 if (devtree_coherency != KERNEL_COHERENCY) { 750 printk(KERN_ERR 751 "kernel coherency:%s != device tree_coherency:%s\n", 752 KERNEL_COHERENCY ? "on" : "off", 753 devtree_coherency ? "on" : "off"); 754 BUG(); 755 } 756 757 return 0; 758 } 759 760 late_initcall(check_cache_coherency); 761 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 762 763 #ifdef CONFIG_DEBUG_FS 764 struct dentry *powerpc_debugfs_root; 765 EXPORT_SYMBOL(powerpc_debugfs_root); 766 767 static int powerpc_debugfs_init(void) 768 { 769 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 770 771 return powerpc_debugfs_root == NULL; 772 } 773 arch_initcall(powerpc_debugfs_init); 774 #endif 775 776 void ppc_printk_progress(char *s, unsigned short hex) 777 { 778 pr_info("%s\n", s); 779 } 780 781 void arch_setup_pdev_archdata(struct platform_device *pdev) 782 { 783 pdev->archdata.dma_mask = DMA_BIT_MASK(32); 784 pdev->dev.dma_mask = &pdev->archdata.dma_mask; 785 set_dma_ops(&pdev->dev, &dma_direct_ops); 786 } 787 788 static __init void print_system_info(void) 789 { 790 pr_info("-----------------------------------------------------\n"); 791 #ifdef CONFIG_PPC_STD_MMU_64 792 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 793 #endif 794 #ifdef CONFIG_PPC_STD_MMU_32 795 pr_info("Hash_size = 0x%lx\n", Hash_size); 796 #endif 797 pr_info("phys_mem_size = 0x%llx\n", 798 (unsigned long long)memblock_phys_mem_size()); 799 800 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 801 pr_info("icache_bsize = 0x%x\n", icache_bsize); 802 if (ucache_bsize != 0) 803 pr_info("ucache_bsize = 0x%x\n", ucache_bsize); 804 805 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 806 pr_info(" possible = 0x%016lx\n", 807 (unsigned long)CPU_FTRS_POSSIBLE); 808 pr_info(" always = 0x%016lx\n", 809 (unsigned long)CPU_FTRS_ALWAYS); 810 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 811 cur_cpu_spec->cpu_user_features, 812 cur_cpu_spec->cpu_user_features2); 813 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 814 #ifdef CONFIG_PPC64 815 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 816 #endif 817 818 #ifdef CONFIG_PPC_STD_MMU_64 819 if (htab_address) 820 pr_info("htab_address = 0x%p\n", htab_address); 821 if (htab_hash_mask) 822 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask); 823 #endif 824 #ifdef CONFIG_PPC_STD_MMU_32 825 if (Hash) 826 pr_info("Hash = 0x%p\n", Hash); 827 if (Hash_mask) 828 pr_info("Hash_mask = 0x%lx\n", Hash_mask); 829 #endif 830 831 if (PHYSICAL_START > 0) 832 pr_info("physical_start = 0x%llx\n", 833 (unsigned long long)PHYSICAL_START); 834 pr_info("-----------------------------------------------------\n"); 835 } 836 837 /* 838 * Called into from start_kernel this initializes memblock, which is used 839 * to manage page allocation until mem_init is called. 840 */ 841 void __init setup_arch(char **cmdline_p) 842 { 843 *cmdline_p = boot_command_line; 844 845 /* Set a half-reasonable default so udelay does something sensible */ 846 loops_per_jiffy = 500000000 / HZ; 847 848 /* Unflatten the device-tree passed by prom_init or kexec */ 849 unflatten_device_tree(); 850 851 /* 852 * Initialize cache line/block info from device-tree (on ppc64) or 853 * just cputable (on ppc32). 854 */ 855 initialize_cache_info(); 856 857 /* Initialize RTAS if available. */ 858 rtas_initialize(); 859 860 /* Check if we have an initrd provided via the device-tree. */ 861 check_for_initrd(); 862 863 /* Probe the machine type, establish ppc_md. */ 864 probe_machine(); 865 866 /* Setup panic notifier if requested by the platform. */ 867 setup_panic(); 868 869 /* 870 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 871 * it from their respective probe() function. 872 */ 873 setup_power_save(); 874 875 /* Discover standard serial ports. */ 876 find_legacy_serial_ports(); 877 878 /* Register early console with the printk subsystem. */ 879 register_early_udbg_console(); 880 881 /* Setup the various CPU maps based on the device-tree. */ 882 smp_setup_cpu_maps(); 883 884 /* Initialize xmon. */ 885 xmon_setup(); 886 887 /* Check the SMT related command line arguments (ppc64). */ 888 check_smt_enabled(); 889 890 /* On BookE, setup per-core TLB data structures. */ 891 setup_tlb_core_data(); 892 893 /* 894 * Release secondary cpus out of their spinloops at 0x60 now that 895 * we can map physical -> logical CPU ids. 896 * 897 * Freescale Book3e parts spin in a loop provided by firmware, 898 * so smp_release_cpus() does nothing for them. 899 */ 900 #ifdef CONFIG_SMP 901 smp_release_cpus(); 902 #endif 903 904 /* Print various info about the machine that has been gathered so far. */ 905 print_system_info(); 906 907 /* Reserve large chunks of memory for use by CMA for KVM. */ 908 kvm_cma_reserve(); 909 910 /* 911 * Reserve any gigantic pages requested on the command line. 912 * memblock needs to have been initialized by the time this is 913 * called since this will reserve memory. 914 */ 915 reserve_hugetlb_gpages(); 916 917 klp_init_thread_info(&init_thread_info); 918 919 init_mm.start_code = (unsigned long)_stext; 920 init_mm.end_code = (unsigned long) _etext; 921 init_mm.end_data = (unsigned long) _edata; 922 init_mm.brk = klimit; 923 #ifdef CONFIG_PPC_64K_PAGES 924 init_mm.context.pte_frag = NULL; 925 #endif 926 #ifdef CONFIG_SPAPR_TCE_IOMMU 927 mm_iommu_init(&init_mm); 928 #endif 929 irqstack_early_init(); 930 exc_lvl_early_init(); 931 emergency_stack_init(); 932 933 initmem_init(); 934 935 #ifdef CONFIG_DUMMY_CONSOLE 936 conswitchp = &dummy_con; 937 #endif 938 if (ppc_md.setup_arch) 939 ppc_md.setup_arch(); 940 941 paging_init(); 942 943 /* Initialize the MMU context management stuff. */ 944 mmu_context_init(); 945 946 #ifdef CONFIG_PPC64 947 /* Interrupt code needs to be 64K-aligned. */ 948 if ((unsigned long)_stext & 0xffff) 949 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 950 (unsigned long)_stext); 951 #endif 952 } 953