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/percpu.h> 35 #include <linux/memblock.h> 36 #include <linux/of_platform.h> 37 #include <linux/hugetlb.h> 38 #include <asm/debugfs.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 #ifdef CONFIG_CRASH_CORE 129 /* This keeps a track of which one is the crashing cpu. */ 130 int crashing_cpu = -1; 131 #endif 132 133 /* also used by kexec */ 134 void machine_shutdown(void) 135 { 136 #ifdef CONFIG_FA_DUMP 137 /* 138 * if fadump is active, cleanup the fadump registration before we 139 * shutdown. 140 */ 141 fadump_cleanup(); 142 #endif 143 144 if (ppc_md.machine_shutdown) 145 ppc_md.machine_shutdown(); 146 } 147 148 static void machine_hang(void) 149 { 150 pr_emerg("System Halted, OK to turn off power\n"); 151 local_irq_disable(); 152 while (1) 153 ; 154 } 155 156 void machine_restart(char *cmd) 157 { 158 machine_shutdown(); 159 if (ppc_md.restart) 160 ppc_md.restart(cmd); 161 162 smp_send_stop(); 163 164 do_kernel_restart(cmd); 165 mdelay(1000); 166 167 machine_hang(); 168 } 169 170 void machine_power_off(void) 171 { 172 machine_shutdown(); 173 if (pm_power_off) 174 pm_power_off(); 175 176 smp_send_stop(); 177 machine_hang(); 178 } 179 /* Used by the G5 thermal driver */ 180 EXPORT_SYMBOL_GPL(machine_power_off); 181 182 void (*pm_power_off)(void); 183 EXPORT_SYMBOL_GPL(pm_power_off); 184 185 void machine_halt(void) 186 { 187 machine_shutdown(); 188 if (ppc_md.halt) 189 ppc_md.halt(); 190 191 smp_send_stop(); 192 machine_hang(); 193 } 194 195 196 #ifdef CONFIG_TAU 197 extern u32 cpu_temp(unsigned long cpu); 198 extern u32 cpu_temp_both(unsigned long cpu); 199 #endif /* CONFIG_TAU */ 200 201 #ifdef CONFIG_SMP 202 DEFINE_PER_CPU(unsigned int, cpu_pvr); 203 #endif 204 205 static void show_cpuinfo_summary(struct seq_file *m) 206 { 207 struct device_node *root; 208 const char *model = NULL; 209 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 210 unsigned long bogosum = 0; 211 int i; 212 for_each_online_cpu(i) 213 bogosum += loops_per_jiffy; 214 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 215 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 216 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 217 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 218 if (ppc_md.name) 219 seq_printf(m, "platform\t: %s\n", ppc_md.name); 220 root = of_find_node_by_path("/"); 221 if (root) 222 model = of_get_property(root, "model", NULL); 223 if (model) 224 seq_printf(m, "model\t\t: %s\n", model); 225 of_node_put(root); 226 227 if (ppc_md.show_cpuinfo != NULL) 228 ppc_md.show_cpuinfo(m); 229 230 #ifdef CONFIG_PPC32 231 /* Display the amount of memory */ 232 seq_printf(m, "Memory\t\t: %d MB\n", 233 (unsigned int)(total_memory / (1024 * 1024))); 234 #endif 235 } 236 237 static int show_cpuinfo(struct seq_file *m, void *v) 238 { 239 unsigned long cpu_id = (unsigned long)v - 1; 240 unsigned int pvr; 241 unsigned long proc_freq; 242 unsigned short maj; 243 unsigned short min; 244 245 /* We only show online cpus: disable preempt (overzealous, I 246 * knew) to prevent cpu going down. */ 247 preempt_disable(); 248 if (!cpu_online(cpu_id)) { 249 preempt_enable(); 250 return 0; 251 } 252 253 #ifdef CONFIG_SMP 254 pvr = per_cpu(cpu_pvr, cpu_id); 255 #else 256 pvr = mfspr(SPRN_PVR); 257 #endif 258 maj = (pvr >> 8) & 0xFF; 259 min = pvr & 0xFF; 260 261 seq_printf(m, "processor\t: %lu\n", cpu_id); 262 seq_printf(m, "cpu\t\t: "); 263 264 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) 265 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 266 else 267 seq_printf(m, "unknown (%08x)", pvr); 268 269 #ifdef CONFIG_ALTIVEC 270 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 271 seq_printf(m, ", altivec supported"); 272 #endif /* CONFIG_ALTIVEC */ 273 274 seq_printf(m, "\n"); 275 276 #ifdef CONFIG_TAU 277 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 278 #ifdef CONFIG_TAU_AVERAGE 279 /* more straightforward, but potentially misleading */ 280 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 281 cpu_temp(cpu_id)); 282 #else 283 /* show the actual temp sensor range */ 284 u32 temp; 285 temp = cpu_temp_both(cpu_id); 286 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 287 temp & 0xff, temp >> 16); 288 #endif 289 } 290 #endif /* CONFIG_TAU */ 291 292 /* 293 * Platforms that have variable clock rates, should implement 294 * the method ppc_md.get_proc_freq() that reports the clock 295 * rate of a given cpu. The rest can use ppc_proc_freq to 296 * report the clock rate that is same across all cpus. 297 */ 298 if (ppc_md.get_proc_freq) 299 proc_freq = ppc_md.get_proc_freq(cpu_id); 300 else 301 proc_freq = ppc_proc_freq; 302 303 if (proc_freq) 304 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 305 proc_freq / 1000000, proc_freq % 1000000); 306 307 if (ppc_md.show_percpuinfo != NULL) 308 ppc_md.show_percpuinfo(m, cpu_id); 309 310 /* If we are a Freescale core do a simple check so 311 * we dont have to keep adding cases in the future */ 312 if (PVR_VER(pvr) & 0x8000) { 313 switch (PVR_VER(pvr)) { 314 case 0x8000: /* 7441/7450/7451, Voyager */ 315 case 0x8001: /* 7445/7455, Apollo 6 */ 316 case 0x8002: /* 7447/7457, Apollo 7 */ 317 case 0x8003: /* 7447A, Apollo 7 PM */ 318 case 0x8004: /* 7448, Apollo 8 */ 319 case 0x800c: /* 7410, Nitro */ 320 maj = ((pvr >> 8) & 0xF); 321 min = PVR_MIN(pvr); 322 break; 323 default: /* e500/book-e */ 324 maj = PVR_MAJ(pvr); 325 min = PVR_MIN(pvr); 326 break; 327 } 328 } else { 329 switch (PVR_VER(pvr)) { 330 case 0x0020: /* 403 family */ 331 maj = PVR_MAJ(pvr) + 1; 332 min = PVR_MIN(pvr); 333 break; 334 case 0x1008: /* 740P/750P ?? */ 335 maj = ((pvr >> 8) & 0xFF) - 1; 336 min = pvr & 0xFF; 337 break; 338 case 0x004e: /* POWER9 bits 12-15 give chip type */ 339 maj = (pvr >> 8) & 0x0F; 340 min = pvr & 0xFF; 341 break; 342 default: 343 maj = (pvr >> 8) & 0xFF; 344 min = pvr & 0xFF; 345 break; 346 } 347 } 348 349 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 350 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 351 352 #ifdef CONFIG_PPC32 353 seq_printf(m, "bogomips\t: %lu.%02lu\n", 354 loops_per_jiffy / (500000/HZ), 355 (loops_per_jiffy / (5000/HZ)) % 100); 356 #endif 357 358 #ifdef CONFIG_SMP 359 seq_printf(m, "\n"); 360 #endif 361 362 preempt_enable(); 363 364 /* If this is the last cpu, print the summary */ 365 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 366 show_cpuinfo_summary(m); 367 368 return 0; 369 } 370 371 static void *c_start(struct seq_file *m, loff_t *pos) 372 { 373 if (*pos == 0) /* just in case, cpu 0 is not the first */ 374 *pos = cpumask_first(cpu_online_mask); 375 else 376 *pos = cpumask_next(*pos - 1, cpu_online_mask); 377 if ((*pos) < nr_cpu_ids) 378 return (void *)(unsigned long)(*pos + 1); 379 return NULL; 380 } 381 382 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 383 { 384 (*pos)++; 385 return c_start(m, pos); 386 } 387 388 static void c_stop(struct seq_file *m, void *v) 389 { 390 } 391 392 const struct seq_operations cpuinfo_op = { 393 .start =c_start, 394 .next = c_next, 395 .stop = c_stop, 396 .show = show_cpuinfo, 397 }; 398 399 void __init check_for_initrd(void) 400 { 401 #ifdef CONFIG_BLK_DEV_INITRD 402 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 403 initrd_start, initrd_end); 404 405 /* If we were passed an initrd, set the ROOT_DEV properly if the values 406 * look sensible. If not, clear initrd reference. 407 */ 408 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 409 initrd_end > initrd_start) 410 ROOT_DEV = Root_RAM0; 411 else 412 initrd_start = initrd_end = 0; 413 414 if (initrd_start) 415 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 416 417 DBG(" <- check_for_initrd()\n"); 418 #endif /* CONFIG_BLK_DEV_INITRD */ 419 } 420 421 #ifdef CONFIG_SMP 422 423 int threads_per_core, threads_per_subcore, threads_shift; 424 cpumask_t threads_core_mask; 425 EXPORT_SYMBOL_GPL(threads_per_core); 426 EXPORT_SYMBOL_GPL(threads_per_subcore); 427 EXPORT_SYMBOL_GPL(threads_shift); 428 EXPORT_SYMBOL_GPL(threads_core_mask); 429 430 static void __init cpu_init_thread_core_maps(int tpc) 431 { 432 int i; 433 434 threads_per_core = tpc; 435 threads_per_subcore = tpc; 436 cpumask_clear(&threads_core_mask); 437 438 /* This implementation only supports power of 2 number of threads 439 * for simplicity and performance 440 */ 441 threads_shift = ilog2(tpc); 442 BUG_ON(tpc != (1 << threads_shift)); 443 444 for (i = 0; i < tpc; i++) 445 cpumask_set_cpu(i, &threads_core_mask); 446 447 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 448 tpc, tpc > 1 ? "s" : ""); 449 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 450 } 451 452 453 /** 454 * setup_cpu_maps - initialize the following cpu maps: 455 * cpu_possible_mask 456 * cpu_present_mask 457 * 458 * Having the possible map set up early allows us to restrict allocations 459 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 460 * 461 * We do not initialize the online map here; cpus set their own bits in 462 * cpu_online_mask as they come up. 463 * 464 * This function is valid only for Open Firmware systems. finish_device_tree 465 * must be called before using this. 466 * 467 * While we're here, we may as well set the "physical" cpu ids in the paca. 468 * 469 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 470 */ 471 void __init smp_setup_cpu_maps(void) 472 { 473 struct device_node *dn = NULL; 474 int cpu = 0; 475 int nthreads = 1; 476 477 DBG("smp_setup_cpu_maps()\n"); 478 479 while ((dn = of_find_node_by_type(dn, "cpu")) && cpu < nr_cpu_ids) { 480 const __be32 *intserv; 481 __be32 cpu_be; 482 int j, len; 483 484 DBG(" * %pOF...\n", dn); 485 486 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 487 &len); 488 if (intserv) { 489 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 490 nthreads); 491 } else { 492 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 493 intserv = of_get_property(dn, "reg", &len); 494 if (!intserv) { 495 cpu_be = cpu_to_be32(cpu); 496 intserv = &cpu_be; /* assume logical == phys */ 497 len = 4; 498 } 499 } 500 501 nthreads = len / sizeof(int); 502 503 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 504 bool avail; 505 506 DBG(" thread %d -> cpu %d (hard id %d)\n", 507 j, cpu, be32_to_cpu(intserv[j])); 508 509 avail = of_device_is_available(dn); 510 if (!avail) 511 avail = !of_property_match_string(dn, 512 "enable-method", "spin-table"); 513 514 set_cpu_present(cpu, avail); 515 set_hard_smp_processor_id(cpu, be32_to_cpu(intserv[j])); 516 set_cpu_possible(cpu, true); 517 cpu++; 518 } 519 } 520 521 /* If no SMT supported, nthreads is forced to 1 */ 522 if (!cpu_has_feature(CPU_FTR_SMT)) { 523 DBG(" SMT disabled ! nthreads forced to 1\n"); 524 nthreads = 1; 525 } 526 527 #ifdef CONFIG_PPC64 528 /* 529 * On pSeries LPAR, we need to know how many cpus 530 * could possibly be added to this partition. 531 */ 532 if (firmware_has_feature(FW_FEATURE_LPAR) && 533 (dn = of_find_node_by_path("/rtas"))) { 534 int num_addr_cell, num_size_cell, maxcpus; 535 const __be32 *ireg; 536 537 num_addr_cell = of_n_addr_cells(dn); 538 num_size_cell = of_n_size_cells(dn); 539 540 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 541 542 if (!ireg) 543 goto out; 544 545 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 546 547 /* Double maxcpus for processors which have SMT capability */ 548 if (cpu_has_feature(CPU_FTR_SMT)) 549 maxcpus *= nthreads; 550 551 if (maxcpus > nr_cpu_ids) { 552 printk(KERN_WARNING 553 "Partition configured for %d cpus, " 554 "operating system maximum is %u.\n", 555 maxcpus, nr_cpu_ids); 556 maxcpus = nr_cpu_ids; 557 } else 558 printk(KERN_INFO "Partition configured for %d cpus.\n", 559 maxcpus); 560 561 for (cpu = 0; cpu < maxcpus; cpu++) 562 set_cpu_possible(cpu, true); 563 out: 564 of_node_put(dn); 565 } 566 vdso_data->processorCount = num_present_cpus(); 567 #endif /* CONFIG_PPC64 */ 568 569 /* Initialize CPU <=> thread mapping/ 570 * 571 * WARNING: We assume that the number of threads is the same for 572 * every CPU in the system. If that is not the case, then some code 573 * here will have to be reworked 574 */ 575 cpu_init_thread_core_maps(nthreads); 576 577 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 578 setup_nr_cpu_ids(); 579 580 free_unused_pacas(); 581 } 582 #endif /* CONFIG_SMP */ 583 584 #ifdef CONFIG_PCSPKR_PLATFORM 585 static __init int add_pcspkr(void) 586 { 587 struct device_node *np; 588 struct platform_device *pd; 589 int ret; 590 591 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 592 of_node_put(np); 593 if (!np) 594 return -ENODEV; 595 596 pd = platform_device_alloc("pcspkr", -1); 597 if (!pd) 598 return -ENOMEM; 599 600 ret = platform_device_add(pd); 601 if (ret) 602 platform_device_put(pd); 603 604 return ret; 605 } 606 device_initcall(add_pcspkr); 607 #endif /* CONFIG_PCSPKR_PLATFORM */ 608 609 void probe_machine(void) 610 { 611 extern struct machdep_calls __machine_desc_start; 612 extern struct machdep_calls __machine_desc_end; 613 unsigned int i; 614 615 /* 616 * Iterate all ppc_md structures until we find the proper 617 * one for the current machine type 618 */ 619 DBG("Probing machine type ...\n"); 620 621 /* 622 * Check ppc_md is empty, if not we have a bug, ie, we setup an 623 * entry before probe_machine() which will be overwritten 624 */ 625 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 626 if (((void **)&ppc_md)[i]) { 627 printk(KERN_ERR "Entry %d in ppc_md non empty before" 628 " machine probe !\n", i); 629 } 630 } 631 632 for (machine_id = &__machine_desc_start; 633 machine_id < &__machine_desc_end; 634 machine_id++) { 635 DBG(" %s ...", machine_id->name); 636 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 637 if (ppc_md.probe()) { 638 DBG(" match !\n"); 639 break; 640 } 641 DBG("\n"); 642 } 643 /* What can we do if we didn't find ? */ 644 if (machine_id >= &__machine_desc_end) { 645 DBG("No suitable machine found !\n"); 646 for (;;); 647 } 648 649 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 650 } 651 652 /* Match a class of boards, not a specific device configuration. */ 653 int check_legacy_ioport(unsigned long base_port) 654 { 655 struct device_node *parent, *np = NULL; 656 int ret = -ENODEV; 657 658 switch(base_port) { 659 case I8042_DATA_REG: 660 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 661 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 662 if (np) { 663 parent = of_get_parent(np); 664 665 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 666 if (!of_i8042_kbd_irq) 667 of_i8042_kbd_irq = 1; 668 669 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 670 if (!of_i8042_aux_irq) 671 of_i8042_aux_irq = 12; 672 673 of_node_put(np); 674 np = parent; 675 break; 676 } 677 np = of_find_node_by_type(NULL, "8042"); 678 /* Pegasos has no device_type on its 8042 node, look for the 679 * name instead */ 680 if (!np) 681 np = of_find_node_by_name(NULL, "8042"); 682 if (np) { 683 of_i8042_kbd_irq = 1; 684 of_i8042_aux_irq = 12; 685 } 686 break; 687 case FDC_BASE: /* FDC1 */ 688 np = of_find_node_by_type(NULL, "fdc"); 689 break; 690 default: 691 /* ipmi is supposed to fail here */ 692 break; 693 } 694 if (!np) 695 return ret; 696 parent = of_get_parent(np); 697 if (parent) { 698 if (strcmp(parent->type, "isa") == 0) 699 ret = 0; 700 of_node_put(parent); 701 } 702 of_node_put(np); 703 return ret; 704 } 705 EXPORT_SYMBOL(check_legacy_ioport); 706 707 static int ppc_panic_event(struct notifier_block *this, 708 unsigned long event, void *ptr) 709 { 710 /* 711 * If firmware-assisted dump has been registered then trigger 712 * firmware-assisted dump and let firmware handle everything else. 713 */ 714 crash_fadump(NULL, ptr); 715 ppc_md.panic(ptr); /* May not return */ 716 return NOTIFY_DONE; 717 } 718 719 static struct notifier_block ppc_panic_block = { 720 .notifier_call = ppc_panic_event, 721 .priority = INT_MIN /* may not return; must be done last */ 722 }; 723 724 void __init setup_panic(void) 725 { 726 if (!ppc_md.panic) 727 return; 728 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 729 } 730 731 #ifdef CONFIG_CHECK_CACHE_COHERENCY 732 /* 733 * For platforms that have configurable cache-coherency. This function 734 * checks that the cache coherency setting of the kernel matches the setting 735 * left by the firmware, as indicated in the device tree. Since a mismatch 736 * will eventually result in DMA failures, we print * and error and call 737 * BUG() in that case. 738 */ 739 740 #ifdef CONFIG_NOT_COHERENT_CACHE 741 #define KERNEL_COHERENCY 0 742 #else 743 #define KERNEL_COHERENCY 1 744 #endif 745 746 static int __init check_cache_coherency(void) 747 { 748 struct device_node *np; 749 const void *prop; 750 int devtree_coherency; 751 752 np = of_find_node_by_path("/"); 753 prop = of_get_property(np, "coherency-off", NULL); 754 of_node_put(np); 755 756 devtree_coherency = prop ? 0 : 1; 757 758 if (devtree_coherency != KERNEL_COHERENCY) { 759 printk(KERN_ERR 760 "kernel coherency:%s != device tree_coherency:%s\n", 761 KERNEL_COHERENCY ? "on" : "off", 762 devtree_coherency ? "on" : "off"); 763 BUG(); 764 } 765 766 return 0; 767 } 768 769 late_initcall(check_cache_coherency); 770 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 771 772 #ifdef CONFIG_DEBUG_FS 773 struct dentry *powerpc_debugfs_root; 774 EXPORT_SYMBOL(powerpc_debugfs_root); 775 776 static int powerpc_debugfs_init(void) 777 { 778 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 779 780 return powerpc_debugfs_root == NULL; 781 } 782 arch_initcall(powerpc_debugfs_init); 783 #endif 784 785 void ppc_printk_progress(char *s, unsigned short hex) 786 { 787 pr_info("%s\n", s); 788 } 789 790 void arch_setup_pdev_archdata(struct platform_device *pdev) 791 { 792 pdev->archdata.dma_mask = DMA_BIT_MASK(32); 793 pdev->dev.dma_mask = &pdev->archdata.dma_mask; 794 set_dma_ops(&pdev->dev, &dma_direct_ops); 795 } 796 797 static __init void print_system_info(void) 798 { 799 pr_info("-----------------------------------------------------\n"); 800 #ifdef CONFIG_PPC_BOOK3S_64 801 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 802 #endif 803 #ifdef CONFIG_PPC_STD_MMU_32 804 pr_info("Hash_size = 0x%lx\n", Hash_size); 805 #endif 806 pr_info("phys_mem_size = 0x%llx\n", 807 (unsigned long long)memblock_phys_mem_size()); 808 809 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 810 pr_info("icache_bsize = 0x%x\n", icache_bsize); 811 if (ucache_bsize != 0) 812 pr_info("ucache_bsize = 0x%x\n", ucache_bsize); 813 814 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 815 pr_info(" possible = 0x%016lx\n", 816 (unsigned long)CPU_FTRS_POSSIBLE); 817 pr_info(" always = 0x%016lx\n", 818 (unsigned long)CPU_FTRS_ALWAYS); 819 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 820 cur_cpu_spec->cpu_user_features, 821 cur_cpu_spec->cpu_user_features2); 822 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 823 #ifdef CONFIG_PPC64 824 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 825 #endif 826 827 #ifdef CONFIG_PPC_BOOK3S_64 828 if (htab_address) 829 pr_info("htab_address = 0x%p\n", htab_address); 830 if (htab_hash_mask) 831 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask); 832 #endif 833 #ifdef CONFIG_PPC_STD_MMU_32 834 if (Hash) 835 pr_info("Hash = 0x%p\n", Hash); 836 if (Hash_mask) 837 pr_info("Hash_mask = 0x%lx\n", Hash_mask); 838 #endif 839 840 if (PHYSICAL_START > 0) 841 pr_info("physical_start = 0x%llx\n", 842 (unsigned long long)PHYSICAL_START); 843 pr_info("-----------------------------------------------------\n"); 844 } 845 846 /* 847 * Called into from start_kernel this initializes memblock, which is used 848 * to manage page allocation until mem_init is called. 849 */ 850 void __init setup_arch(char **cmdline_p) 851 { 852 *cmdline_p = boot_command_line; 853 854 /* Set a half-reasonable default so udelay does something sensible */ 855 loops_per_jiffy = 500000000 / HZ; 856 857 /* Unflatten the device-tree passed by prom_init or kexec */ 858 unflatten_device_tree(); 859 860 /* 861 * Initialize cache line/block info from device-tree (on ppc64) or 862 * just cputable (on ppc32). 863 */ 864 initialize_cache_info(); 865 866 /* Initialize RTAS if available. */ 867 rtas_initialize(); 868 869 /* Check if we have an initrd provided via the device-tree. */ 870 check_for_initrd(); 871 872 /* Probe the machine type, establish ppc_md. */ 873 probe_machine(); 874 875 /* Setup panic notifier if requested by the platform. */ 876 setup_panic(); 877 878 /* 879 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 880 * it from their respective probe() function. 881 */ 882 setup_power_save(); 883 884 /* Discover standard serial ports. */ 885 find_legacy_serial_ports(); 886 887 /* Register early console with the printk subsystem. */ 888 register_early_udbg_console(); 889 890 /* Setup the various CPU maps based on the device-tree. */ 891 smp_setup_cpu_maps(); 892 893 /* Initialize xmon. */ 894 xmon_setup(); 895 896 /* Check the SMT related command line arguments (ppc64). */ 897 check_smt_enabled(); 898 899 /* On BookE, setup per-core TLB data structures. */ 900 setup_tlb_core_data(); 901 902 /* 903 * Release secondary cpus out of their spinloops at 0x60 now that 904 * we can map physical -> logical CPU ids. 905 * 906 * Freescale Book3e parts spin in a loop provided by firmware, 907 * so smp_release_cpus() does nothing for them. 908 */ 909 #ifdef CONFIG_SMP 910 smp_release_cpus(); 911 #endif 912 913 /* Print various info about the machine that has been gathered so far. */ 914 print_system_info(); 915 916 /* Reserve large chunks of memory for use by CMA for KVM. */ 917 kvm_cma_reserve(); 918 919 klp_init_thread_info(&init_thread_info); 920 921 init_mm.start_code = (unsigned long)_stext; 922 init_mm.end_code = (unsigned long) _etext; 923 init_mm.end_data = (unsigned long) _edata; 924 init_mm.brk = klimit; 925 926 #ifdef CONFIG_PPC_MM_SLICES 927 #ifdef CONFIG_PPC64 928 if (!radix_enabled()) 929 init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW_USER64; 930 #else 931 #error "context.addr_limit not initialized." 932 #endif 933 #endif 934 935 #ifdef CONFIG_SPAPR_TCE_IOMMU 936 mm_iommu_init(&init_mm); 937 #endif 938 irqstack_early_init(); 939 exc_lvl_early_init(); 940 emergency_stack_init(); 941 942 initmem_init(); 943 944 #ifdef CONFIG_DUMMY_CONSOLE 945 conswitchp = &dummy_con; 946 #endif 947 if (ppc_md.setup_arch) 948 ppc_md.setup_arch(); 949 950 paging_init(); 951 952 /* Initialize the MMU context management stuff. */ 953 mmu_context_init(); 954 955 #ifdef CONFIG_PPC64 956 /* Interrupt code needs to be 64K-aligned. */ 957 if ((unsigned long)_stext & 0xffff) 958 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 959 (unsigned long)_stext); 960 #endif 961 } 962