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 #ifdef CONFIG_SMP 196 DEFINE_PER_CPU(unsigned int, cpu_pvr); 197 #endif 198 199 static void show_cpuinfo_summary(struct seq_file *m) 200 { 201 struct device_node *root; 202 const char *model = NULL; 203 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 204 unsigned long bogosum = 0; 205 int i; 206 for_each_online_cpu(i) 207 bogosum += loops_per_jiffy; 208 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 209 bogosum/(500000/HZ), bogosum/(5000/HZ) % 100); 210 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 211 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 212 if (ppc_md.name) 213 seq_printf(m, "platform\t: %s\n", ppc_md.name); 214 root = of_find_node_by_path("/"); 215 if (root) 216 model = of_get_property(root, "model", NULL); 217 if (model) 218 seq_printf(m, "model\t\t: %s\n", model); 219 of_node_put(root); 220 221 if (ppc_md.show_cpuinfo != NULL) 222 ppc_md.show_cpuinfo(m); 223 224 #ifdef CONFIG_PPC32 225 /* Display the amount of memory */ 226 seq_printf(m, "Memory\t\t: %d MB\n", 227 (unsigned int)(total_memory / (1024 * 1024))); 228 #endif 229 } 230 231 static int show_cpuinfo(struct seq_file *m, void *v) 232 { 233 unsigned long cpu_id = (unsigned long)v - 1; 234 unsigned int pvr; 235 unsigned long proc_freq; 236 unsigned short maj; 237 unsigned short min; 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 && cur_cpu_spec->cpu_name) 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 case 0x004e: /* POWER9 bits 12-15 give chip type */ 325 maj = (pvr >> 8) & 0x0F; 326 min = pvr & 0xFF; 327 break; 328 default: 329 maj = (pvr >> 8) & 0xFF; 330 min = pvr & 0xFF; 331 break; 332 } 333 } 334 335 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 336 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 337 338 #ifdef CONFIG_PPC32 339 seq_printf(m, "bogomips\t: %lu.%02lu\n", 340 loops_per_jiffy / (500000/HZ), 341 (loops_per_jiffy / (5000/HZ)) % 100); 342 #endif 343 seq_printf(m, "\n"); 344 345 /* If this is the last cpu, print the summary */ 346 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 347 show_cpuinfo_summary(m); 348 349 return 0; 350 } 351 352 static void *c_start(struct seq_file *m, loff_t *pos) 353 { 354 if (*pos == 0) /* just in case, cpu 0 is not the first */ 355 *pos = cpumask_first(cpu_online_mask); 356 else 357 *pos = cpumask_next(*pos - 1, cpu_online_mask); 358 if ((*pos) < nr_cpu_ids) 359 return (void *)(unsigned long)(*pos + 1); 360 return NULL; 361 } 362 363 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 364 { 365 (*pos)++; 366 return c_start(m, pos); 367 } 368 369 static void c_stop(struct seq_file *m, void *v) 370 { 371 } 372 373 const struct seq_operations cpuinfo_op = { 374 .start = c_start, 375 .next = c_next, 376 .stop = c_stop, 377 .show = show_cpuinfo, 378 }; 379 380 void __init check_for_initrd(void) 381 { 382 #ifdef CONFIG_BLK_DEV_INITRD 383 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 384 initrd_start, initrd_end); 385 386 /* If we were passed an initrd, set the ROOT_DEV properly if the values 387 * look sensible. If not, clear initrd reference. 388 */ 389 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 390 initrd_end > initrd_start) 391 ROOT_DEV = Root_RAM0; 392 else 393 initrd_start = initrd_end = 0; 394 395 if (initrd_start) 396 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 397 398 DBG(" <- check_for_initrd()\n"); 399 #endif /* CONFIG_BLK_DEV_INITRD */ 400 } 401 402 #ifdef CONFIG_SMP 403 404 int threads_per_core, threads_per_subcore, threads_shift; 405 cpumask_t threads_core_mask; 406 EXPORT_SYMBOL_GPL(threads_per_core); 407 EXPORT_SYMBOL_GPL(threads_per_subcore); 408 EXPORT_SYMBOL_GPL(threads_shift); 409 EXPORT_SYMBOL_GPL(threads_core_mask); 410 411 static void __init cpu_init_thread_core_maps(int tpc) 412 { 413 int i; 414 415 threads_per_core = tpc; 416 threads_per_subcore = tpc; 417 cpumask_clear(&threads_core_mask); 418 419 /* This implementation only supports power of 2 number of threads 420 * for simplicity and performance 421 */ 422 threads_shift = ilog2(tpc); 423 BUG_ON(tpc != (1 << threads_shift)); 424 425 for (i = 0; i < tpc; i++) 426 cpumask_set_cpu(i, &threads_core_mask); 427 428 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 429 tpc, tpc > 1 ? "s" : ""); 430 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 431 } 432 433 434 u32 *cpu_to_phys_id = NULL; 435 436 /** 437 * setup_cpu_maps - initialize the following cpu maps: 438 * cpu_possible_mask 439 * cpu_present_mask 440 * 441 * Having the possible map set up early allows us to restrict allocations 442 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 443 * 444 * We do not initialize the online map here; cpus set their own bits in 445 * cpu_online_mask as they come up. 446 * 447 * This function is valid only for Open Firmware systems. finish_device_tree 448 * must be called before using this. 449 * 450 * While we're here, we may as well set the "physical" cpu ids in the paca. 451 * 452 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 453 */ 454 void __init smp_setup_cpu_maps(void) 455 { 456 struct device_node *dn; 457 int cpu = 0; 458 int nthreads = 1; 459 460 DBG("smp_setup_cpu_maps()\n"); 461 462 cpu_to_phys_id = __va(memblock_alloc(nr_cpu_ids * sizeof(u32), 463 __alignof__(u32))); 464 memset(cpu_to_phys_id, 0, nr_cpu_ids * sizeof(u32)); 465 466 for_each_node_by_type(dn, "cpu") { 467 const __be32 *intserv; 468 __be32 cpu_be; 469 int j, len; 470 471 DBG(" * %pOF...\n", dn); 472 473 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 474 &len); 475 if (intserv) { 476 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 477 nthreads); 478 } else { 479 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 480 intserv = of_get_property(dn, "reg", &len); 481 if (!intserv) { 482 cpu_be = cpu_to_be32(cpu); 483 /* XXX: what is this? uninitialized?? */ 484 intserv = &cpu_be; /* assume logical == phys */ 485 len = 4; 486 } 487 } 488 489 nthreads = len / sizeof(int); 490 491 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 492 bool avail; 493 494 DBG(" thread %d -> cpu %d (hard id %d)\n", 495 j, cpu, be32_to_cpu(intserv[j])); 496 497 avail = of_device_is_available(dn); 498 if (!avail) 499 avail = !of_property_match_string(dn, 500 "enable-method", "spin-table"); 501 502 set_cpu_present(cpu, avail); 503 set_cpu_possible(cpu, true); 504 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); 505 cpu++; 506 } 507 508 if (cpu >= nr_cpu_ids) { 509 of_node_put(dn); 510 break; 511 } 512 } 513 514 /* If no SMT supported, nthreads is forced to 1 */ 515 if (!cpu_has_feature(CPU_FTR_SMT)) { 516 DBG(" SMT disabled ! nthreads forced to 1\n"); 517 nthreads = 1; 518 } 519 520 #ifdef CONFIG_PPC64 521 /* 522 * On pSeries LPAR, we need to know how many cpus 523 * could possibly be added to this partition. 524 */ 525 if (firmware_has_feature(FW_FEATURE_LPAR) && 526 (dn = of_find_node_by_path("/rtas"))) { 527 int num_addr_cell, num_size_cell, maxcpus; 528 const __be32 *ireg; 529 530 num_addr_cell = of_n_addr_cells(dn); 531 num_size_cell = of_n_size_cells(dn); 532 533 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 534 535 if (!ireg) 536 goto out; 537 538 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 539 540 /* Double maxcpus for processors which have SMT capability */ 541 if (cpu_has_feature(CPU_FTR_SMT)) 542 maxcpus *= nthreads; 543 544 if (maxcpus > nr_cpu_ids) { 545 printk(KERN_WARNING 546 "Partition configured for %d cpus, " 547 "operating system maximum is %u.\n", 548 maxcpus, nr_cpu_ids); 549 maxcpus = nr_cpu_ids; 550 } else 551 printk(KERN_INFO "Partition configured for %d cpus.\n", 552 maxcpus); 553 554 for (cpu = 0; cpu < maxcpus; cpu++) 555 set_cpu_possible(cpu, true); 556 out: 557 of_node_put(dn); 558 } 559 vdso_data->processorCount = num_present_cpus(); 560 #endif /* CONFIG_PPC64 */ 561 562 /* Initialize CPU <=> thread mapping/ 563 * 564 * WARNING: We assume that the number of threads is the same for 565 * every CPU in the system. If that is not the case, then some code 566 * here will have to be reworked 567 */ 568 cpu_init_thread_core_maps(nthreads); 569 570 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 571 setup_nr_cpu_ids(); 572 573 free_unused_pacas(); 574 } 575 #endif /* CONFIG_SMP */ 576 577 #ifdef CONFIG_PCSPKR_PLATFORM 578 static __init int add_pcspkr(void) 579 { 580 struct device_node *np; 581 struct platform_device *pd; 582 int ret; 583 584 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 585 of_node_put(np); 586 if (!np) 587 return -ENODEV; 588 589 pd = platform_device_alloc("pcspkr", -1); 590 if (!pd) 591 return -ENOMEM; 592 593 ret = platform_device_add(pd); 594 if (ret) 595 platform_device_put(pd); 596 597 return ret; 598 } 599 device_initcall(add_pcspkr); 600 #endif /* CONFIG_PCSPKR_PLATFORM */ 601 602 void probe_machine(void) 603 { 604 extern struct machdep_calls __machine_desc_start; 605 extern struct machdep_calls __machine_desc_end; 606 unsigned int i; 607 608 /* 609 * Iterate all ppc_md structures until we find the proper 610 * one for the current machine type 611 */ 612 DBG("Probing machine type ...\n"); 613 614 /* 615 * Check ppc_md is empty, if not we have a bug, ie, we setup an 616 * entry before probe_machine() which will be overwritten 617 */ 618 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 619 if (((void **)&ppc_md)[i]) { 620 printk(KERN_ERR "Entry %d in ppc_md non empty before" 621 " machine probe !\n", i); 622 } 623 } 624 625 for (machine_id = &__machine_desc_start; 626 machine_id < &__machine_desc_end; 627 machine_id++) { 628 DBG(" %s ...", machine_id->name); 629 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 630 if (ppc_md.probe()) { 631 DBG(" match !\n"); 632 break; 633 } 634 DBG("\n"); 635 } 636 /* What can we do if we didn't find ? */ 637 if (machine_id >= &__machine_desc_end) { 638 DBG("No suitable machine found !\n"); 639 for (;;); 640 } 641 642 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 643 } 644 645 /* Match a class of boards, not a specific device configuration. */ 646 int check_legacy_ioport(unsigned long base_port) 647 { 648 struct device_node *parent, *np = NULL; 649 int ret = -ENODEV; 650 651 switch(base_port) { 652 case I8042_DATA_REG: 653 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 654 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 655 if (np) { 656 parent = of_get_parent(np); 657 658 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 659 if (!of_i8042_kbd_irq) 660 of_i8042_kbd_irq = 1; 661 662 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 663 if (!of_i8042_aux_irq) 664 of_i8042_aux_irq = 12; 665 666 of_node_put(np); 667 np = parent; 668 break; 669 } 670 np = of_find_node_by_type(NULL, "8042"); 671 /* Pegasos has no device_type on its 8042 node, look for the 672 * name instead */ 673 if (!np) 674 np = of_find_node_by_name(NULL, "8042"); 675 if (np) { 676 of_i8042_kbd_irq = 1; 677 of_i8042_aux_irq = 12; 678 } 679 break; 680 case FDC_BASE: /* FDC1 */ 681 np = of_find_node_by_type(NULL, "fdc"); 682 break; 683 default: 684 /* ipmi is supposed to fail here */ 685 break; 686 } 687 if (!np) 688 return ret; 689 parent = of_get_parent(np); 690 if (parent) { 691 if (strcmp(parent->type, "isa") == 0) 692 ret = 0; 693 of_node_put(parent); 694 } 695 of_node_put(np); 696 return ret; 697 } 698 EXPORT_SYMBOL(check_legacy_ioport); 699 700 static int ppc_panic_event(struct notifier_block *this, 701 unsigned long event, void *ptr) 702 { 703 /* 704 * panic does a local_irq_disable, but we really 705 * want interrupts to be hard disabled. 706 */ 707 hard_irq_disable(); 708 709 /* 710 * If firmware-assisted dump has been registered then trigger 711 * firmware-assisted dump and let firmware handle everything else. 712 */ 713 crash_fadump(NULL, ptr); 714 if (ppc_md.panic) 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 /* PPC64 always does a hard irq disable in its panic handler */ 727 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic) 728 return; 729 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 730 } 731 732 #ifdef CONFIG_CHECK_CACHE_COHERENCY 733 /* 734 * For platforms that have configurable cache-coherency. This function 735 * checks that the cache coherency setting of the kernel matches the setting 736 * left by the firmware, as indicated in the device tree. Since a mismatch 737 * will eventually result in DMA failures, we print * and error and call 738 * BUG() in that case. 739 */ 740 741 #ifdef CONFIG_NOT_COHERENT_CACHE 742 #define KERNEL_COHERENCY 0 743 #else 744 #define KERNEL_COHERENCY 1 745 #endif 746 747 static int __init check_cache_coherency(void) 748 { 749 struct device_node *np; 750 const void *prop; 751 int devtree_coherency; 752 753 np = of_find_node_by_path("/"); 754 prop = of_get_property(np, "coherency-off", NULL); 755 of_node_put(np); 756 757 devtree_coherency = prop ? 0 : 1; 758 759 if (devtree_coherency != KERNEL_COHERENCY) { 760 printk(KERN_ERR 761 "kernel coherency:%s != device tree_coherency:%s\n", 762 KERNEL_COHERENCY ? "on" : "off", 763 devtree_coherency ? "on" : "off"); 764 BUG(); 765 } 766 767 return 0; 768 } 769 770 late_initcall(check_cache_coherency); 771 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 772 773 #ifdef CONFIG_DEBUG_FS 774 struct dentry *powerpc_debugfs_root; 775 EXPORT_SYMBOL(powerpc_debugfs_root); 776 777 static int powerpc_debugfs_init(void) 778 { 779 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 780 781 return powerpc_debugfs_root == NULL; 782 } 783 arch_initcall(powerpc_debugfs_init); 784 #endif 785 786 void ppc_printk_progress(char *s, unsigned short hex) 787 { 788 pr_info("%s\n", s); 789 } 790 791 void arch_setup_pdev_archdata(struct platform_device *pdev) 792 { 793 pdev->archdata.dma_mask = DMA_BIT_MASK(32); 794 pdev->dev.dma_mask = &pdev->archdata.dma_mask; 795 set_dma_ops(&pdev->dev, &dma_nommu_ops); 796 } 797 798 static __init void print_system_info(void) 799 { 800 pr_info("-----------------------------------------------------\n"); 801 #ifdef CONFIG_PPC_BOOK3S_64 802 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 803 #endif 804 #ifdef CONFIG_PPC_STD_MMU_32 805 pr_info("Hash_size = 0x%lx\n", Hash_size); 806 #endif 807 pr_info("phys_mem_size = 0x%llx\n", 808 (unsigned long long)memblock_phys_mem_size()); 809 810 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 811 pr_info("icache_bsize = 0x%x\n", icache_bsize); 812 if (ucache_bsize != 0) 813 pr_info("ucache_bsize = 0x%x\n", ucache_bsize); 814 815 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 816 pr_info(" possible = 0x%016lx\n", 817 (unsigned long)CPU_FTRS_POSSIBLE); 818 pr_info(" always = 0x%016lx\n", 819 (unsigned long)CPU_FTRS_ALWAYS); 820 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 821 cur_cpu_spec->cpu_user_features, 822 cur_cpu_spec->cpu_user_features2); 823 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 824 #ifdef CONFIG_PPC64 825 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 826 #endif 827 828 #ifdef CONFIG_PPC_BOOK3S_64 829 if (htab_address) 830 pr_info("htab_address = 0x%p\n", htab_address); 831 if (htab_hash_mask) 832 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask); 833 #endif 834 #ifdef CONFIG_PPC_STD_MMU_32 835 if (Hash) 836 pr_info("Hash = 0x%p\n", Hash); 837 if (Hash_mask) 838 pr_info("Hash_mask = 0x%lx\n", Hash_mask); 839 #endif 840 841 if (PHYSICAL_START > 0) 842 pr_info("physical_start = 0x%llx\n", 843 (unsigned long long)PHYSICAL_START); 844 pr_info("-----------------------------------------------------\n"); 845 } 846 847 #ifdef CONFIG_SMP 848 static void smp_setup_pacas(void) 849 { 850 int cpu; 851 852 for_each_possible_cpu(cpu) { 853 if (cpu == smp_processor_id()) 854 continue; 855 allocate_paca(cpu); 856 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); 857 } 858 859 memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32)); 860 cpu_to_phys_id = NULL; 861 } 862 #endif 863 864 /* 865 * Called into from start_kernel this initializes memblock, which is used 866 * to manage page allocation until mem_init is called. 867 */ 868 void __init setup_arch(char **cmdline_p) 869 { 870 *cmdline_p = boot_command_line; 871 872 /* Set a half-reasonable default so udelay does something sensible */ 873 loops_per_jiffy = 500000000 / HZ; 874 875 /* Unflatten the device-tree passed by prom_init or kexec */ 876 unflatten_device_tree(); 877 878 /* 879 * Initialize cache line/block info from device-tree (on ppc64) or 880 * just cputable (on ppc32). 881 */ 882 initialize_cache_info(); 883 884 /* Initialize RTAS if available. */ 885 rtas_initialize(); 886 887 /* Check if we have an initrd provided via the device-tree. */ 888 check_for_initrd(); 889 890 /* Probe the machine type, establish ppc_md. */ 891 probe_machine(); 892 893 /* Setup panic notifier if requested by the platform. */ 894 setup_panic(); 895 896 /* 897 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 898 * it from their respective probe() function. 899 */ 900 setup_power_save(); 901 902 /* Discover standard serial ports. */ 903 find_legacy_serial_ports(); 904 905 /* Register early console with the printk subsystem. */ 906 register_early_udbg_console(); 907 908 /* Setup the various CPU maps based on the device-tree. */ 909 smp_setup_cpu_maps(); 910 911 /* Initialize xmon. */ 912 xmon_setup(); 913 914 /* Check the SMT related command line arguments (ppc64). */ 915 check_smt_enabled(); 916 917 /* Parse memory topology */ 918 mem_topology_setup(); 919 920 /* 921 * Release secondary cpus out of their spinloops at 0x60 now that 922 * we can map physical -> logical CPU ids. 923 * 924 * Freescale Book3e parts spin in a loop provided by firmware, 925 * so smp_release_cpus() does nothing for them. 926 */ 927 #ifdef CONFIG_SMP 928 smp_setup_pacas(); 929 930 /* On BookE, setup per-core TLB data structures. */ 931 setup_tlb_core_data(); 932 933 smp_release_cpus(); 934 #endif 935 936 /* Print various info about the machine that has been gathered so far. */ 937 print_system_info(); 938 939 /* Reserve large chunks of memory for use by CMA for KVM. */ 940 kvm_cma_reserve(); 941 942 klp_init_thread_info(&init_thread_info); 943 944 init_mm.start_code = (unsigned long)_stext; 945 init_mm.end_code = (unsigned long) _etext; 946 init_mm.end_data = (unsigned long) _edata; 947 init_mm.brk = klimit; 948 949 #ifdef CONFIG_PPC_MM_SLICES 950 #ifdef CONFIG_PPC64 951 if (!radix_enabled()) 952 init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW_USER64; 953 #elif defined(CONFIG_PPC_8xx) 954 init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW; 955 #else 956 #error "context.addr_limit not initialized." 957 #endif 958 #endif 959 960 #ifdef CONFIG_SPAPR_TCE_IOMMU 961 mm_iommu_init(&init_mm); 962 #endif 963 irqstack_early_init(); 964 exc_lvl_early_init(); 965 emergency_stack_init(); 966 967 initmem_init(); 968 969 #ifdef CONFIG_DUMMY_CONSOLE 970 conswitchp = &dummy_con; 971 #endif 972 if (ppc_md.setup_arch) 973 ppc_md.setup_arch(); 974 975 setup_barrier_nospec(); 976 977 paging_init(); 978 979 /* Initialize the MMU context management stuff. */ 980 mmu_context_init(); 981 982 #ifdef CONFIG_PPC64 983 /* Interrupt code needs to be 64K-aligned. */ 984 if ((unsigned long)_stext & 0xffff) 985 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 986 (unsigned long)_stext); 987 #endif 988 } 989