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 = memblock_alloc(nr_cpu_ids * sizeof(u32), 463 __alignof__(u32)); 464 if (!cpu_to_phys_id) 465 panic("%s: Failed to allocate %zu bytes align=0x%zx\n", 466 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32)); 467 468 for_each_node_by_type(dn, "cpu") { 469 const __be32 *intserv; 470 __be32 cpu_be; 471 int j, len; 472 473 DBG(" * %pOF...\n", dn); 474 475 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 476 &len); 477 if (intserv) { 478 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 479 nthreads); 480 } else { 481 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 482 intserv = of_get_property(dn, "reg", &len); 483 if (!intserv) { 484 cpu_be = cpu_to_be32(cpu); 485 /* XXX: what is this? uninitialized?? */ 486 intserv = &cpu_be; /* assume logical == phys */ 487 len = 4; 488 } 489 } 490 491 nthreads = len / sizeof(int); 492 493 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 494 bool avail; 495 496 DBG(" thread %d -> cpu %d (hard id %d)\n", 497 j, cpu, be32_to_cpu(intserv[j])); 498 499 avail = of_device_is_available(dn); 500 if (!avail) 501 avail = !of_property_match_string(dn, 502 "enable-method", "spin-table"); 503 504 set_cpu_present(cpu, avail); 505 set_cpu_possible(cpu, true); 506 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); 507 cpu++; 508 } 509 510 if (cpu >= nr_cpu_ids) { 511 of_node_put(dn); 512 break; 513 } 514 } 515 516 /* If no SMT supported, nthreads is forced to 1 */ 517 if (!cpu_has_feature(CPU_FTR_SMT)) { 518 DBG(" SMT disabled ! nthreads forced to 1\n"); 519 nthreads = 1; 520 } 521 522 #ifdef CONFIG_PPC64 523 /* 524 * On pSeries LPAR, we need to know how many cpus 525 * could possibly be added to this partition. 526 */ 527 if (firmware_has_feature(FW_FEATURE_LPAR) && 528 (dn = of_find_node_by_path("/rtas"))) { 529 int num_addr_cell, num_size_cell, maxcpus; 530 const __be32 *ireg; 531 532 num_addr_cell = of_n_addr_cells(dn); 533 num_size_cell = of_n_size_cells(dn); 534 535 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 536 537 if (!ireg) 538 goto out; 539 540 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 541 542 /* Double maxcpus for processors which have SMT capability */ 543 if (cpu_has_feature(CPU_FTR_SMT)) 544 maxcpus *= nthreads; 545 546 if (maxcpus > nr_cpu_ids) { 547 printk(KERN_WARNING 548 "Partition configured for %d cpus, " 549 "operating system maximum is %u.\n", 550 maxcpus, nr_cpu_ids); 551 maxcpus = nr_cpu_ids; 552 } else 553 printk(KERN_INFO "Partition configured for %d cpus.\n", 554 maxcpus); 555 556 for (cpu = 0; cpu < maxcpus; cpu++) 557 set_cpu_possible(cpu, true); 558 out: 559 of_node_put(dn); 560 } 561 vdso_data->processorCount = num_present_cpus(); 562 #endif /* CONFIG_PPC64 */ 563 564 /* Initialize CPU <=> thread mapping/ 565 * 566 * WARNING: We assume that the number of threads is the same for 567 * every CPU in the system. If that is not the case, then some code 568 * here will have to be reworked 569 */ 570 cpu_init_thread_core_maps(nthreads); 571 572 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 573 setup_nr_cpu_ids(); 574 575 free_unused_pacas(); 576 } 577 #endif /* CONFIG_SMP */ 578 579 #ifdef CONFIG_PCSPKR_PLATFORM 580 static __init int add_pcspkr(void) 581 { 582 struct device_node *np; 583 struct platform_device *pd; 584 int ret; 585 586 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 587 of_node_put(np); 588 if (!np) 589 return -ENODEV; 590 591 pd = platform_device_alloc("pcspkr", -1); 592 if (!pd) 593 return -ENOMEM; 594 595 ret = platform_device_add(pd); 596 if (ret) 597 platform_device_put(pd); 598 599 return ret; 600 } 601 device_initcall(add_pcspkr); 602 #endif /* CONFIG_PCSPKR_PLATFORM */ 603 604 void probe_machine(void) 605 { 606 extern struct machdep_calls __machine_desc_start; 607 extern struct machdep_calls __machine_desc_end; 608 unsigned int i; 609 610 /* 611 * Iterate all ppc_md structures until we find the proper 612 * one for the current machine type 613 */ 614 DBG("Probing machine type ...\n"); 615 616 /* 617 * Check ppc_md is empty, if not we have a bug, ie, we setup an 618 * entry before probe_machine() which will be overwritten 619 */ 620 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 621 if (((void **)&ppc_md)[i]) { 622 printk(KERN_ERR "Entry %d in ppc_md non empty before" 623 " machine probe !\n", i); 624 } 625 } 626 627 for (machine_id = &__machine_desc_start; 628 machine_id < &__machine_desc_end; 629 machine_id++) { 630 DBG(" %s ...", machine_id->name); 631 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 632 if (ppc_md.probe()) { 633 DBG(" match !\n"); 634 break; 635 } 636 DBG("\n"); 637 } 638 /* What can we do if we didn't find ? */ 639 if (machine_id >= &__machine_desc_end) { 640 pr_err("No suitable machine description found !\n"); 641 for (;;); 642 } 643 644 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 645 } 646 647 /* Match a class of boards, not a specific device configuration. */ 648 int check_legacy_ioport(unsigned long base_port) 649 { 650 struct device_node *parent, *np = NULL; 651 int ret = -ENODEV; 652 653 switch(base_port) { 654 case I8042_DATA_REG: 655 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 656 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 657 if (np) { 658 parent = of_get_parent(np); 659 660 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 661 if (!of_i8042_kbd_irq) 662 of_i8042_kbd_irq = 1; 663 664 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 665 if (!of_i8042_aux_irq) 666 of_i8042_aux_irq = 12; 667 668 of_node_put(np); 669 np = parent; 670 break; 671 } 672 np = of_find_node_by_type(NULL, "8042"); 673 /* Pegasos has no device_type on its 8042 node, look for the 674 * name instead */ 675 if (!np) 676 np = of_find_node_by_name(NULL, "8042"); 677 if (np) { 678 of_i8042_kbd_irq = 1; 679 of_i8042_aux_irq = 12; 680 } 681 break; 682 case FDC_BASE: /* FDC1 */ 683 np = of_find_node_by_type(NULL, "fdc"); 684 break; 685 default: 686 /* ipmi is supposed to fail here */ 687 break; 688 } 689 if (!np) 690 return ret; 691 parent = of_get_parent(np); 692 if (parent) { 693 if (of_node_is_type(parent, "isa")) 694 ret = 0; 695 of_node_put(parent); 696 } 697 of_node_put(np); 698 return ret; 699 } 700 EXPORT_SYMBOL(check_legacy_ioport); 701 702 static int ppc_panic_event(struct notifier_block *this, 703 unsigned long event, void *ptr) 704 { 705 /* 706 * panic does a local_irq_disable, but we really 707 * want interrupts to be hard disabled. 708 */ 709 hard_irq_disable(); 710 711 /* 712 * If firmware-assisted dump has been registered then trigger 713 * firmware-assisted dump and let firmware handle everything else. 714 */ 715 crash_fadump(NULL, ptr); 716 if (ppc_md.panic) 717 ppc_md.panic(ptr); /* May not return */ 718 return NOTIFY_DONE; 719 } 720 721 static struct notifier_block ppc_panic_block = { 722 .notifier_call = ppc_panic_event, 723 .priority = INT_MIN /* may not return; must be done last */ 724 }; 725 726 void __init setup_panic(void) 727 { 728 /* PPC64 always does a hard irq disable in its panic handler */ 729 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic) 730 return; 731 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 732 } 733 734 #ifdef CONFIG_CHECK_CACHE_COHERENCY 735 /* 736 * For platforms that have configurable cache-coherency. This function 737 * checks that the cache coherency setting of the kernel matches the setting 738 * left by the firmware, as indicated in the device tree. Since a mismatch 739 * will eventually result in DMA failures, we print * and error and call 740 * BUG() in that case. 741 */ 742 743 #ifdef CONFIG_NOT_COHERENT_CACHE 744 #define KERNEL_COHERENCY 0 745 #else 746 #define KERNEL_COHERENCY 1 747 #endif 748 749 static int __init check_cache_coherency(void) 750 { 751 struct device_node *np; 752 const void *prop; 753 int devtree_coherency; 754 755 np = of_find_node_by_path("/"); 756 prop = of_get_property(np, "coherency-off", NULL); 757 of_node_put(np); 758 759 devtree_coherency = prop ? 0 : 1; 760 761 if (devtree_coherency != KERNEL_COHERENCY) { 762 printk(KERN_ERR 763 "kernel coherency:%s != device tree_coherency:%s\n", 764 KERNEL_COHERENCY ? "on" : "off", 765 devtree_coherency ? "on" : "off"); 766 BUG(); 767 } 768 769 return 0; 770 } 771 772 late_initcall(check_cache_coherency); 773 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 774 775 #ifdef CONFIG_DEBUG_FS 776 struct dentry *powerpc_debugfs_root; 777 EXPORT_SYMBOL(powerpc_debugfs_root); 778 779 static int powerpc_debugfs_init(void) 780 { 781 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 782 783 return powerpc_debugfs_root == NULL; 784 } 785 arch_initcall(powerpc_debugfs_init); 786 #endif 787 788 void ppc_printk_progress(char *s, unsigned short hex) 789 { 790 pr_info("%s\n", s); 791 } 792 793 void arch_setup_pdev_archdata(struct platform_device *pdev) 794 { 795 pdev->archdata.dma_mask = DMA_BIT_MASK(32); 796 pdev->dev.dma_mask = &pdev->archdata.dma_mask; 797 } 798 799 static __init void print_system_info(void) 800 { 801 pr_info("-----------------------------------------------------\n"); 802 #ifdef CONFIG_PPC_BOOK3S_64 803 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 804 #endif 805 #ifdef CONFIG_PPC_BOOK3S_32 806 pr_info("Hash_size = 0x%lx\n", Hash_size); 807 #endif 808 pr_info("phys_mem_size = 0x%llx\n", 809 (unsigned long long)memblock_phys_mem_size()); 810 811 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 812 pr_info("icache_bsize = 0x%x\n", icache_bsize); 813 if (ucache_bsize != 0) 814 pr_info("ucache_bsize = 0x%x\n", ucache_bsize); 815 816 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 817 pr_info(" possible = 0x%016lx\n", 818 (unsigned long)CPU_FTRS_POSSIBLE); 819 pr_info(" always = 0x%016lx\n", 820 (unsigned long)CPU_FTRS_ALWAYS); 821 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 822 cur_cpu_spec->cpu_user_features, 823 cur_cpu_spec->cpu_user_features2); 824 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 825 #ifdef CONFIG_PPC64 826 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 827 #endif 828 829 #ifdef CONFIG_PPC_BOOK3S_64 830 if (htab_address) 831 pr_info("htab_address = 0x%p\n", htab_address); 832 if (htab_hash_mask) 833 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask); 834 #endif 835 #ifdef CONFIG_PPC_BOOK3S_32 836 if (Hash) 837 pr_info("Hash = 0x%p\n", Hash); 838 if (Hash_mask) 839 pr_info("Hash_mask = 0x%lx\n", Hash_mask); 840 #endif 841 842 if (PHYSICAL_START > 0) 843 pr_info("physical_start = 0x%llx\n", 844 (unsigned long long)PHYSICAL_START); 845 pr_info("-----------------------------------------------------\n"); 846 } 847 848 #ifdef CONFIG_SMP 849 static void smp_setup_pacas(void) 850 { 851 int cpu; 852 853 for_each_possible_cpu(cpu) { 854 if (cpu == smp_processor_id()) 855 continue; 856 allocate_paca(cpu); 857 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); 858 } 859 860 memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32)); 861 cpu_to_phys_id = NULL; 862 } 863 #endif 864 865 /* 866 * Called into from start_kernel this initializes memblock, which is used 867 * to manage page allocation until mem_init is called. 868 */ 869 void __init setup_arch(char **cmdline_p) 870 { 871 *cmdline_p = boot_command_line; 872 873 /* Set a half-reasonable default so udelay does something sensible */ 874 loops_per_jiffy = 500000000 / HZ; 875 876 /* Unflatten the device-tree passed by prom_init or kexec */ 877 unflatten_device_tree(); 878 879 /* 880 * Initialize cache line/block info from device-tree (on ppc64) or 881 * just cputable (on ppc32). 882 */ 883 initialize_cache_info(); 884 885 /* Initialize RTAS if available. */ 886 rtas_initialize(); 887 888 /* Check if we have an initrd provided via the device-tree. */ 889 check_for_initrd(); 890 891 /* Probe the machine type, establish ppc_md. */ 892 probe_machine(); 893 894 /* Setup panic notifier if requested by the platform. */ 895 setup_panic(); 896 897 /* 898 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 899 * it from their respective probe() function. 900 */ 901 setup_power_save(); 902 903 /* Discover standard serial ports. */ 904 find_legacy_serial_ports(); 905 906 /* Register early console with the printk subsystem. */ 907 register_early_udbg_console(); 908 909 /* Setup the various CPU maps based on the device-tree. */ 910 smp_setup_cpu_maps(); 911 912 /* Initialize xmon. */ 913 xmon_setup(); 914 915 /* Check the SMT related command line arguments (ppc64). */ 916 check_smt_enabled(); 917 918 /* Parse memory topology */ 919 mem_topology_setup(); 920 921 /* 922 * Release secondary cpus out of their spinloops at 0x60 now that 923 * we can map physical -> logical CPU ids. 924 * 925 * Freescale Book3e parts spin in a loop provided by firmware, 926 * so smp_release_cpus() does nothing for them. 927 */ 928 #ifdef CONFIG_SMP 929 smp_setup_pacas(); 930 931 /* On BookE, setup per-core TLB data structures. */ 932 setup_tlb_core_data(); 933 934 smp_release_cpus(); 935 #endif 936 937 /* Print various info about the machine that has been gathered so far. */ 938 print_system_info(); 939 940 /* Reserve large chunks of memory for use by CMA for KVM. */ 941 kvm_cma_reserve(); 942 943 klp_init_thread_info(&init_task); 944 945 init_mm.start_code = (unsigned long)_stext; 946 init_mm.end_code = (unsigned long) _etext; 947 init_mm.end_data = (unsigned long) _edata; 948 init_mm.brk = klimit; 949 950 #ifdef CONFIG_PPC_MM_SLICES 951 #ifdef CONFIG_PPC64 952 if (!radix_enabled()) 953 init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW_USER64; 954 #elif defined(CONFIG_PPC_8xx) 955 init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW; 956 #else 957 #error "context.addr_limit not initialized." 958 #endif 959 #endif 960 961 #ifdef CONFIG_SPAPR_TCE_IOMMU 962 mm_iommu_init(&init_mm); 963 #endif 964 irqstack_early_init(); 965 exc_lvl_early_init(); 966 emergency_stack_init(); 967 968 initmem_init(); 969 970 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 971 972 #ifdef CONFIG_DUMMY_CONSOLE 973 conswitchp = &dummy_con; 974 #endif 975 if (ppc_md.setup_arch) 976 ppc_md.setup_arch(); 977 978 setup_barrier_nospec(); 979 setup_spectre_v2(); 980 981 paging_init(); 982 983 /* Initialize the MMU context management stuff. */ 984 mmu_context_init(); 985 986 #ifdef CONFIG_PPC64 987 /* Interrupt code needs to be 64K-aligned. */ 988 if ((unsigned long)_stext & 0xffff) 989 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 990 (unsigned long)_stext); 991 #endif 992 } 993