1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * Common boot and setup code for both 32-bit and 64-bit. 4 * Extracted from arch/powerpc/kernel/setup_64.c. 5 * 6 * Copyright (C) 2001 PPC64 Team, IBM Corp 7 */ 8 9#undef DEBUG 10 11#include <linux/export.h> 12#include <linux/string.h> 13#include <linux/sched.h> 14#include <linux/init.h> 15#include <linux/kernel.h> 16#include <linux/reboot.h> 17#include <linux/delay.h> 18#include <linux/initrd.h> 19#include <linux/platform_device.h> 20#include <linux/seq_file.h> 21#include <linux/ioport.h> 22#include <linux/console.h> 23#include <linux/screen_info.h> 24#include <linux/root_dev.h> 25#include <linux/notifier.h> 26#include <linux/cpu.h> 27#include <linux/unistd.h> 28#include <linux/serial.h> 29#include <linux/serial_8250.h> 30#include <linux/percpu.h> 31#include <linux/memblock.h> 32#include <linux/of_platform.h> 33#include <linux/hugetlb.h> 34#include <linux/pgtable.h> 35#include <asm/debugfs.h> 36#include <asm/io.h> 37#include <asm/paca.h> 38#include <asm/prom.h> 39#include <asm/processor.h> 40#include <asm/vdso_datapage.h> 41#include <asm/smp.h> 42#include <asm/elf.h> 43#include <asm/machdep.h> 44#include <asm/time.h> 45#include <asm/cputable.h> 46#include <asm/sections.h> 47#include <asm/firmware.h> 48#include <asm/btext.h> 49#include <asm/nvram.h> 50#include <asm/setup.h> 51#include <asm/rtas.h> 52#include <asm/iommu.h> 53#include <asm/serial.h> 54#include <asm/cache.h> 55#include <asm/page.h> 56#include <asm/mmu.h> 57#include <asm/xmon.h> 58#include <asm/cputhreads.h> 59#include <mm/mmu_decl.h> 60#include <asm/fadump.h> 61#include <asm/udbg.h> 62#include <asm/hugetlb.h> 63#include <asm/livepatch.h> 64#include <asm/mmu_context.h> 65#include <asm/cpu_has_feature.h> 66#include <asm/kasan.h> 67 68#include "setup.h" 69 70#ifdef DEBUG 71#include <asm/udbg.h> 72#define DBG(fmt...) udbg_printf(fmt) 73#else 74#define DBG(fmt...) 75#endif 76 77/* The main machine-dep calls structure 78 */ 79struct machdep_calls ppc_md; 80EXPORT_SYMBOL(ppc_md); 81struct machdep_calls *machine_id; 82EXPORT_SYMBOL(machine_id); 83 84int boot_cpuid = -1; 85EXPORT_SYMBOL_GPL(boot_cpuid); 86 87/* 88 * These are used in binfmt_elf.c to put aux entries on the stack 89 * for each elf executable being started. 90 */ 91int dcache_bsize; 92int icache_bsize; 93int ucache_bsize; 94 95 96unsigned long klimit = (unsigned long) _end; 97 98/* 99 * This still seems to be needed... -- paulus 100 */ 101struct screen_info screen_info = { 102 .orig_x = 0, 103 .orig_y = 25, 104 .orig_video_cols = 80, 105 .orig_video_lines = 25, 106 .orig_video_isVGA = 1, 107 .orig_video_points = 16 108}; 109#if defined(CONFIG_FB_VGA16_MODULE) 110EXPORT_SYMBOL(screen_info); 111#endif 112 113/* Variables required to store legacy IO irq routing */ 114int of_i8042_kbd_irq; 115EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); 116int of_i8042_aux_irq; 117EXPORT_SYMBOL_GPL(of_i8042_aux_irq); 118 119#ifdef __DO_IRQ_CANON 120/* XXX should go elsewhere eventually */ 121int ppc_do_canonicalize_irqs; 122EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 123#endif 124 125#ifdef CONFIG_CRASH_CORE 126/* This keeps a track of which one is the crashing cpu. */ 127int crashing_cpu = -1; 128#endif 129 130/* also used by kexec */ 131void machine_shutdown(void) 132{ 133 /* 134 * if fadump is active, cleanup the fadump registration before we 135 * shutdown. 136 */ 137 fadump_cleanup(); 138 139 if (ppc_md.machine_shutdown) 140 ppc_md.machine_shutdown(); 141} 142 143static 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 151void 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 165void 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 */ 175EXPORT_SYMBOL_GPL(machine_power_off); 176 177void (*pm_power_off)(void); 178EXPORT_SYMBOL_GPL(pm_power_off); 179 180void 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#ifdef CONFIG_SMP 191DEFINE_PER_CPU(unsigned int, cpu_pvr); 192#endif 193 194static void show_cpuinfo_summary(struct seq_file *m) 195{ 196 struct device_node *root; 197 const char *model = NULL; 198 unsigned long bogosum = 0; 199 int i; 200 201 if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) { 202 for_each_online_cpu(i) 203 bogosum += loops_per_jiffy; 204 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 205 bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100); 206 } 207 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 208 if (ppc_md.name) 209 seq_printf(m, "platform\t: %s\n", ppc_md.name); 210 root = of_find_node_by_path("/"); 211 if (root) 212 model = of_get_property(root, "model", NULL); 213 if (model) 214 seq_printf(m, "model\t\t: %s\n", model); 215 of_node_put(root); 216 217 if (ppc_md.show_cpuinfo != NULL) 218 ppc_md.show_cpuinfo(m); 219 220 /* Display the amount of memory */ 221 if (IS_ENABLED(CONFIG_PPC32)) 222 seq_printf(m, "Memory\t\t: %d MB\n", 223 (unsigned int)(total_memory / (1024 * 1024))); 224} 225 226static int show_cpuinfo(struct seq_file *m, void *v) 227{ 228 unsigned long cpu_id = (unsigned long)v - 1; 229 unsigned int pvr; 230 unsigned long proc_freq; 231 unsigned short maj; 232 unsigned short min; 233 234#ifdef CONFIG_SMP 235 pvr = per_cpu(cpu_pvr, cpu_id); 236#else 237 pvr = mfspr(SPRN_PVR); 238#endif 239 maj = (pvr >> 8) & 0xFF; 240 min = pvr & 0xFF; 241 242 seq_printf(m, "processor\t: %lu\n", cpu_id); 243 seq_printf(m, "cpu\t\t: "); 244 245 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) 246 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 247 else 248 seq_printf(m, "unknown (%08x)", pvr); 249 250 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 251 seq_printf(m, ", altivec supported"); 252 253 seq_printf(m, "\n"); 254 255#ifdef CONFIG_TAU 256 if (cpu_has_feature(CPU_FTR_TAU)) { 257 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) { 258 /* more straightforward, but potentially misleading */ 259 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 260 cpu_temp(cpu_id)); 261 } else { 262 /* show the actual temp sensor range */ 263 u32 temp; 264 temp = cpu_temp_both(cpu_id); 265 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 266 temp & 0xff, temp >> 16); 267 } 268 } 269#endif /* CONFIG_TAU */ 270 271 /* 272 * Platforms that have variable clock rates, should implement 273 * the method ppc_md.get_proc_freq() that reports the clock 274 * rate of a given cpu. The rest can use ppc_proc_freq to 275 * report the clock rate that is same across all cpus. 276 */ 277 if (ppc_md.get_proc_freq) 278 proc_freq = ppc_md.get_proc_freq(cpu_id); 279 else 280 proc_freq = ppc_proc_freq; 281 282 if (proc_freq) 283 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 284 proc_freq / 1000000, proc_freq % 1000000); 285 286 if (ppc_md.show_percpuinfo != NULL) 287 ppc_md.show_percpuinfo(m, cpu_id); 288 289 /* If we are a Freescale core do a simple check so 290 * we dont have to keep adding cases in the future */ 291 if (PVR_VER(pvr) & 0x8000) { 292 switch (PVR_VER(pvr)) { 293 case 0x8000: /* 7441/7450/7451, Voyager */ 294 case 0x8001: /* 7445/7455, Apollo 6 */ 295 case 0x8002: /* 7447/7457, Apollo 7 */ 296 case 0x8003: /* 7447A, Apollo 7 PM */ 297 case 0x8004: /* 7448, Apollo 8 */ 298 case 0x800c: /* 7410, Nitro */ 299 maj = ((pvr >> 8) & 0xF); 300 min = PVR_MIN(pvr); 301 break; 302 default: /* e500/book-e */ 303 maj = PVR_MAJ(pvr); 304 min = PVR_MIN(pvr); 305 break; 306 } 307 } else { 308 switch (PVR_VER(pvr)) { 309 case 0x1008: /* 740P/750P ?? */ 310 maj = ((pvr >> 8) & 0xFF) - 1; 311 min = pvr & 0xFF; 312 break; 313 case 0x004e: /* POWER9 bits 12-15 give chip type */ 314 case 0x0080: /* POWER10 bit 12 gives SMT8/4 */ 315 maj = (pvr >> 8) & 0x0F; 316 min = pvr & 0xFF; 317 break; 318 default: 319 maj = (pvr >> 8) & 0xFF; 320 min = pvr & 0xFF; 321 break; 322 } 323 } 324 325 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 326 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 327 328 if (IS_ENABLED(CONFIG_PPC32)) 329 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ), 330 (loops_per_jiffy / (5000 / HZ)) % 100); 331 332 seq_printf(m, "\n"); 333 334 /* If this is the last cpu, print the summary */ 335 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 336 show_cpuinfo_summary(m); 337 338 return 0; 339} 340 341static void *c_start(struct seq_file *m, loff_t *pos) 342{ 343 if (*pos == 0) /* just in case, cpu 0 is not the first */ 344 *pos = cpumask_first(cpu_online_mask); 345 else 346 *pos = cpumask_next(*pos - 1, cpu_online_mask); 347 if ((*pos) < nr_cpu_ids) 348 return (void *)(unsigned long)(*pos + 1); 349 return NULL; 350} 351 352static void *c_next(struct seq_file *m, void *v, loff_t *pos) 353{ 354 (*pos)++; 355 return c_start(m, pos); 356} 357 358static void c_stop(struct seq_file *m, void *v) 359{ 360} 361 362const struct seq_operations cpuinfo_op = { 363 .start = c_start, 364 .next = c_next, 365 .stop = c_stop, 366 .show = show_cpuinfo, 367}; 368 369void __init check_for_initrd(void) 370{ 371#ifdef CONFIG_BLK_DEV_INITRD 372 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 373 initrd_start, initrd_end); 374 375 /* If we were passed an initrd, set the ROOT_DEV properly if the values 376 * look sensible. If not, clear initrd reference. 377 */ 378 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 379 initrd_end > initrd_start) 380 ROOT_DEV = Root_RAM0; 381 else 382 initrd_start = initrd_end = 0; 383 384 if (initrd_start) 385 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 386 387 DBG(" <- check_for_initrd()\n"); 388#endif /* CONFIG_BLK_DEV_INITRD */ 389} 390 391#ifdef CONFIG_SMP 392 393int threads_per_core, threads_per_subcore, threads_shift __read_mostly; 394cpumask_t threads_core_mask __read_mostly; 395EXPORT_SYMBOL_GPL(threads_per_core); 396EXPORT_SYMBOL_GPL(threads_per_subcore); 397EXPORT_SYMBOL_GPL(threads_shift); 398EXPORT_SYMBOL_GPL(threads_core_mask); 399 400static void __init cpu_init_thread_core_maps(int tpc) 401{ 402 int i; 403 404 threads_per_core = tpc; 405 threads_per_subcore = tpc; 406 cpumask_clear(&threads_core_mask); 407 408 /* This implementation only supports power of 2 number of threads 409 * for simplicity and performance 410 */ 411 threads_shift = ilog2(tpc); 412 BUG_ON(tpc != (1 << threads_shift)); 413 414 for (i = 0; i < tpc; i++) 415 cpumask_set_cpu(i, &threads_core_mask); 416 417 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 418 tpc, tpc > 1 ? "s" : ""); 419 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 420} 421 422 423u32 *cpu_to_phys_id = NULL; 424 425/** 426 * setup_cpu_maps - initialize the following cpu maps: 427 * cpu_possible_mask 428 * cpu_present_mask 429 * 430 * Having the possible map set up early allows us to restrict allocations 431 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 432 * 433 * We do not initialize the online map here; cpus set their own bits in 434 * cpu_online_mask as they come up. 435 * 436 * This function is valid only for Open Firmware systems. finish_device_tree 437 * must be called before using this. 438 * 439 * While we're here, we may as well set the "physical" cpu ids in the paca. 440 * 441 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 442 */ 443void __init smp_setup_cpu_maps(void) 444{ 445 struct device_node *dn; 446 int cpu = 0; 447 int nthreads = 1; 448 449 DBG("smp_setup_cpu_maps()\n"); 450 451 cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32), 452 __alignof__(u32)); 453 if (!cpu_to_phys_id) 454 panic("%s: Failed to allocate %zu bytes align=0x%zx\n", 455 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32)); 456 457 for_each_node_by_type(dn, "cpu") { 458 const __be32 *intserv; 459 __be32 cpu_be; 460 int j, len; 461 462 DBG(" * %pOF...\n", dn); 463 464 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 465 &len); 466 if (intserv) { 467 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 468 nthreads); 469 } else { 470 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 471 intserv = of_get_property(dn, "reg", &len); 472 if (!intserv) { 473 cpu_be = cpu_to_be32(cpu); 474 /* XXX: what is this? uninitialized?? */ 475 intserv = &cpu_be; /* assume logical == phys */ 476 len = 4; 477 } 478 } 479 480 nthreads = len / sizeof(int); 481 482 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 483 bool avail; 484 485 DBG(" thread %d -> cpu %d (hard id %d)\n", 486 j, cpu, be32_to_cpu(intserv[j])); 487 488 avail = of_device_is_available(dn); 489 if (!avail) 490 avail = !of_property_match_string(dn, 491 "enable-method", "spin-table"); 492 493 set_cpu_present(cpu, avail); 494 set_cpu_possible(cpu, true); 495 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); 496 cpu++; 497 } 498 499 if (cpu >= nr_cpu_ids) { 500 of_node_put(dn); 501 break; 502 } 503 } 504 505 /* If no SMT supported, nthreads is forced to 1 */ 506 if (!cpu_has_feature(CPU_FTR_SMT)) { 507 DBG(" SMT disabled ! nthreads forced to 1\n"); 508 nthreads = 1; 509 } 510 511#ifdef CONFIG_PPC64 512 /* 513 * On pSeries LPAR, we need to know how many cpus 514 * could possibly be added to this partition. 515 */ 516 if (firmware_has_feature(FW_FEATURE_LPAR) && 517 (dn = of_find_node_by_path("/rtas"))) { 518 int num_addr_cell, num_size_cell, maxcpus; 519 const __be32 *ireg; 520 521 num_addr_cell = of_n_addr_cells(dn); 522 num_size_cell = of_n_size_cells(dn); 523 524 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 525 526 if (!ireg) 527 goto out; 528 529 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 530 531 /* Double maxcpus for processors which have SMT capability */ 532 if (cpu_has_feature(CPU_FTR_SMT)) 533 maxcpus *= nthreads; 534 535 if (maxcpus > nr_cpu_ids) { 536 printk(KERN_WARNING 537 "Partition configured for %d cpus, " 538 "operating system maximum is %u.\n", 539 maxcpus, nr_cpu_ids); 540 maxcpus = nr_cpu_ids; 541 } else 542 printk(KERN_INFO "Partition configured for %d cpus.\n", 543 maxcpus); 544 545 for (cpu = 0; cpu < maxcpus; cpu++) 546 set_cpu_possible(cpu, true); 547 out: 548 of_node_put(dn); 549 } 550 vdso_data->processorCount = num_present_cpus(); 551#endif /* CONFIG_PPC64 */ 552 553 /* Initialize CPU <=> thread mapping/ 554 * 555 * WARNING: We assume that the number of threads is the same for 556 * every CPU in the system. If that is not the case, then some code 557 * here will have to be reworked 558 */ 559 cpu_init_thread_core_maps(nthreads); 560 561 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 562 setup_nr_cpu_ids(); 563 564 free_unused_pacas(); 565} 566#endif /* CONFIG_SMP */ 567 568#ifdef CONFIG_PCSPKR_PLATFORM 569static __init int add_pcspkr(void) 570{ 571 struct device_node *np; 572 struct platform_device *pd; 573 int ret; 574 575 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 576 of_node_put(np); 577 if (!np) 578 return -ENODEV; 579 580 pd = platform_device_alloc("pcspkr", -1); 581 if (!pd) 582 return -ENOMEM; 583 584 ret = platform_device_add(pd); 585 if (ret) 586 platform_device_put(pd); 587 588 return ret; 589} 590device_initcall(add_pcspkr); 591#endif /* CONFIG_PCSPKR_PLATFORM */ 592 593void probe_machine(void) 594{ 595 extern struct machdep_calls __machine_desc_start; 596 extern struct machdep_calls __machine_desc_end; 597 unsigned int i; 598 599 /* 600 * Iterate all ppc_md structures until we find the proper 601 * one for the current machine type 602 */ 603 DBG("Probing machine type ...\n"); 604 605 /* 606 * Check ppc_md is empty, if not we have a bug, ie, we setup an 607 * entry before probe_machine() which will be overwritten 608 */ 609 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 610 if (((void **)&ppc_md)[i]) { 611 printk(KERN_ERR "Entry %d in ppc_md non empty before" 612 " machine probe !\n", i); 613 } 614 } 615 616 for (machine_id = &__machine_desc_start; 617 machine_id < &__machine_desc_end; 618 machine_id++) { 619 DBG(" %s ...", machine_id->name); 620 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 621 if (ppc_md.probe()) { 622 DBG(" match !\n"); 623 break; 624 } 625 DBG("\n"); 626 } 627 /* What can we do if we didn't find ? */ 628 if (machine_id >= &__machine_desc_end) { 629 pr_err("No suitable machine description found !\n"); 630 for (;;); 631 } 632 633 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 634} 635 636/* Match a class of boards, not a specific device configuration. */ 637int check_legacy_ioport(unsigned long base_port) 638{ 639 struct device_node *parent, *np = NULL; 640 int ret = -ENODEV; 641 642 switch(base_port) { 643 case I8042_DATA_REG: 644 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 645 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 646 if (np) { 647 parent = of_get_parent(np); 648 649 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 650 if (!of_i8042_kbd_irq) 651 of_i8042_kbd_irq = 1; 652 653 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 654 if (!of_i8042_aux_irq) 655 of_i8042_aux_irq = 12; 656 657 of_node_put(np); 658 np = parent; 659 break; 660 } 661 np = of_find_node_by_type(NULL, "8042"); 662 /* Pegasos has no device_type on its 8042 node, look for the 663 * name instead */ 664 if (!np) 665 np = of_find_node_by_name(NULL, "8042"); 666 if (np) { 667 of_i8042_kbd_irq = 1; 668 of_i8042_aux_irq = 12; 669 } 670 break; 671 case FDC_BASE: /* FDC1 */ 672 np = of_find_node_by_type(NULL, "fdc"); 673 break; 674 default: 675 /* ipmi is supposed to fail here */ 676 break; 677 } 678 if (!np) 679 return ret; 680 parent = of_get_parent(np); 681 if (parent) { 682 if (of_node_is_type(parent, "isa")) 683 ret = 0; 684 of_node_put(parent); 685 } 686 of_node_put(np); 687 return ret; 688} 689EXPORT_SYMBOL(check_legacy_ioport); 690 691static int ppc_panic_event(struct notifier_block *this, 692 unsigned long event, void *ptr) 693{ 694 /* 695 * panic does a local_irq_disable, but we really 696 * want interrupts to be hard disabled. 697 */ 698 hard_irq_disable(); 699 700 /* 701 * If firmware-assisted dump has been registered then trigger 702 * firmware-assisted dump and let firmware handle everything else. 703 */ 704 crash_fadump(NULL, ptr); 705 if (ppc_md.panic) 706 ppc_md.panic(ptr); /* May not return */ 707 return NOTIFY_DONE; 708} 709 710static 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/* 716 * Dump out kernel offset information on panic. 717 */ 718static int dump_kernel_offset(struct notifier_block *self, unsigned long v, 719 void *p) 720{ 721 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", 722 kaslr_offset(), KERNELBASE); 723 724 return 0; 725} 726 727static struct notifier_block kernel_offset_notifier = { 728 .notifier_call = dump_kernel_offset 729}; 730 731void __init setup_panic(void) 732{ 733 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) 734 atomic_notifier_chain_register(&panic_notifier_list, 735 &kernel_offset_notifier); 736 737 /* PPC64 always does a hard irq disable in its panic handler */ 738 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic) 739 return; 740 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 741} 742 743#ifdef CONFIG_CHECK_CACHE_COHERENCY 744/* 745 * For platforms that have configurable cache-coherency. This function 746 * checks that the cache coherency setting of the kernel matches the setting 747 * left by the firmware, as indicated in the device tree. Since a mismatch 748 * will eventually result in DMA failures, we print * and error and call 749 * BUG() in that case. 750 */ 751 752#define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE)) 753 754static int __init check_cache_coherency(void) 755{ 756 struct device_node *np; 757 const void *prop; 758 bool devtree_coherency; 759 760 np = of_find_node_by_path("/"); 761 prop = of_get_property(np, "coherency-off", NULL); 762 of_node_put(np); 763 764 devtree_coherency = prop ? false : true; 765 766 if (devtree_coherency != KERNEL_COHERENCY) { 767 printk(KERN_ERR 768 "kernel coherency:%s != device tree_coherency:%s\n", 769 KERNEL_COHERENCY ? "on" : "off", 770 devtree_coherency ? "on" : "off"); 771 BUG(); 772 } 773 774 return 0; 775} 776 777late_initcall(check_cache_coherency); 778#endif /* CONFIG_CHECK_CACHE_COHERENCY */ 779 780#ifdef CONFIG_DEBUG_FS 781struct dentry *powerpc_debugfs_root; 782EXPORT_SYMBOL(powerpc_debugfs_root); 783 784static int powerpc_debugfs_init(void) 785{ 786 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 787 return 0; 788} 789arch_initcall(powerpc_debugfs_init); 790#endif 791 792void ppc_printk_progress(char *s, unsigned short hex) 793{ 794 pr_info("%s\n", s); 795} 796 797static __init void print_system_info(void) 798{ 799 pr_info("-----------------------------------------------------\n"); 800 pr_info("phys_mem_size = 0x%llx\n", 801 (unsigned long long)memblock_phys_mem_size()); 802 803 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 804 pr_info("icache_bsize = 0x%x\n", icache_bsize); 805 if (ucache_bsize != 0) 806 pr_info("ucache_bsize = 0x%x\n", ucache_bsize); 807 808 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 809 pr_info(" possible = 0x%016lx\n", 810 (unsigned long)CPU_FTRS_POSSIBLE); 811 pr_info(" always = 0x%016lx\n", 812 (unsigned long)CPU_FTRS_ALWAYS); 813 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 814 cur_cpu_spec->cpu_user_features, 815 cur_cpu_spec->cpu_user_features2); 816 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 817#ifdef CONFIG_PPC64 818 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 819#ifdef CONFIG_PPC_BOOK3S 820 pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START); 821 pr_info("IO start = 0x%lx\n", KERN_IO_START); 822 pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap); 823#endif 824#endif 825 826 if (!early_radix_enabled()) 827 print_system_hash_info(); 828 829 if (PHYSICAL_START > 0) 830 pr_info("physical_start = 0x%llx\n", 831 (unsigned long long)PHYSICAL_START); 832 pr_info("-----------------------------------------------------\n"); 833} 834 835#ifdef CONFIG_SMP 836static void smp_setup_pacas(void) 837{ 838 int cpu; 839 840 for_each_possible_cpu(cpu) { 841 if (cpu == smp_processor_id()) 842 continue; 843 allocate_paca(cpu); 844 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); 845 } 846 847 memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32)); 848 cpu_to_phys_id = NULL; 849} 850#endif 851 852/* 853 * Called into from start_kernel this initializes memblock, which is used 854 * to manage page allocation until mem_init is called. 855 */ 856void __init setup_arch(char **cmdline_p) 857{ 858 kasan_init(); 859 860 *cmdline_p = boot_command_line; 861 862 /* Set a half-reasonable default so udelay does something sensible */ 863 loops_per_jiffy = 500000000 / HZ; 864 865 /* Unflatten the device-tree passed by prom_init or kexec */ 866 unflatten_device_tree(); 867 868 /* 869 * Initialize cache line/block info from device-tree (on ppc64) or 870 * just cputable (on ppc32). 871 */ 872 initialize_cache_info(); 873 874 /* Initialize RTAS if available. */ 875 rtas_initialize(); 876 877 /* Check if we have an initrd provided via the device-tree. */ 878 check_for_initrd(); 879 880 /* Probe the machine type, establish ppc_md. */ 881 probe_machine(); 882 883 /* Setup panic notifier if requested by the platform. */ 884 setup_panic(); 885 886 /* 887 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 888 * it from their respective probe() function. 889 */ 890 setup_power_save(); 891 892 /* Discover standard serial ports. */ 893 find_legacy_serial_ports(); 894 895 /* Register early console with the printk subsystem. */ 896 register_early_udbg_console(); 897 898 /* Setup the various CPU maps based on the device-tree. */ 899 smp_setup_cpu_maps(); 900 901 /* Initialize xmon. */ 902 xmon_setup(); 903 904 /* Check the SMT related command line arguments (ppc64). */ 905 check_smt_enabled(); 906 907 /* Parse memory topology */ 908 mem_topology_setup(); 909 /* Set max_mapnr before paging_init() */ 910 set_max_mapnr(max_pfn); 911 912 /* 913 * Release secondary cpus out of their spinloops at 0x60 now that 914 * we can map physical -> logical CPU ids. 915 * 916 * Freescale Book3e parts spin in a loop provided by firmware, 917 * so smp_release_cpus() does nothing for them. 918 */ 919#ifdef CONFIG_SMP 920 smp_setup_pacas(); 921 922 /* On BookE, setup per-core TLB data structures. */ 923 setup_tlb_core_data(); 924#endif 925 926 /* Print various info about the machine that has been gathered so far. */ 927 print_system_info(); 928 929 /* Reserve large chunks of memory for use by CMA for KVM. */ 930 kvm_cma_reserve(); 931 932 /* Reserve large chunks of memory for us by CMA for hugetlb */ 933 gigantic_hugetlb_cma_reserve(); 934 935 klp_init_thread_info(&init_task); 936 937 init_mm.start_code = (unsigned long)_stext; 938 init_mm.end_code = (unsigned long) _etext; 939 init_mm.end_data = (unsigned long) _edata; 940 init_mm.brk = klimit; 941 942 mm_iommu_init(&init_mm); 943 irqstack_early_init(); 944 exc_lvl_early_init(); 945 emergency_stack_init(); 946 947 smp_release_cpus(); 948 949 initmem_init(); 950 951 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 952 953 if (ppc_md.setup_arch) 954 ppc_md.setup_arch(); 955 956 setup_barrier_nospec(); 957 setup_spectre_v2(); 958 959 paging_init(); 960 961 /* Initialize the MMU context management stuff. */ 962 mmu_context_init(); 963 964 /* Interrupt code needs to be 64K-aligned. */ 965 if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff) 966 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 967 (unsigned long)_stext); 968} 969