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 */ 79 struct machdep_calls ppc_md; 80 EXPORT_SYMBOL(ppc_md); 81 struct machdep_calls *machine_id; 82 EXPORT_SYMBOL(machine_id); 83 84 int boot_cpuid = -1; 85 EXPORT_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 */ 91 int dcache_bsize; 92 int icache_bsize; 93 int ucache_bsize; 94 95 96 unsigned long klimit = (unsigned long) _end; 97 98 /* 99 * This still seems to be needed... -- paulus 100 */ 101 struct 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) 110 EXPORT_SYMBOL(screen_info); 111 #endif 112 113 /* Variables required to store legacy IO irq routing */ 114 int of_i8042_kbd_irq; 115 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); 116 int of_i8042_aux_irq; 117 EXPORT_SYMBOL_GPL(of_i8042_aux_irq); 118 119 #ifdef __DO_IRQ_CANON 120 /* XXX should go elsewhere eventually */ 121 int ppc_do_canonicalize_irqs; 122 EXPORT_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. */ 127 int crashing_cpu = -1; 128 #endif 129 130 /* also used by kexec */ 131 void 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 } 142 143 static void machine_hang(void) 144 { 145 pr_emerg("System Halted, OK to turn off power\n"); 146 local_irq_disable(); 147 while (1) 148 ; 149 } 150 151 void machine_restart(char *cmd) 152 { 153 machine_shutdown(); 154 if (ppc_md.restart) 155 ppc_md.restart(cmd); 156 157 smp_send_stop(); 158 159 do_kernel_restart(cmd); 160 mdelay(1000); 161 162 machine_hang(); 163 } 164 165 void machine_power_off(void) 166 { 167 machine_shutdown(); 168 if (pm_power_off) 169 pm_power_off(); 170 171 smp_send_stop(); 172 machine_hang(); 173 } 174 /* Used by the G5 thermal driver */ 175 EXPORT_SYMBOL_GPL(machine_power_off); 176 177 void (*pm_power_off)(void); 178 EXPORT_SYMBOL_GPL(pm_power_off); 179 180 void machine_halt(void) 181 { 182 machine_shutdown(); 183 if (ppc_md.halt) 184 ppc_md.halt(); 185 186 smp_send_stop(); 187 machine_hang(); 188 } 189 190 #ifdef CONFIG_SMP 191 DEFINE_PER_CPU(unsigned int, cpu_pvr); 192 #endif 193 194 static 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 } 225 226 static 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 maj = (pvr >> 8) & 0x0F; 315 min = pvr & 0xFF; 316 break; 317 default: 318 maj = (pvr >> 8) & 0xFF; 319 min = pvr & 0xFF; 320 break; 321 } 322 } 323 324 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 325 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 326 327 if (IS_ENABLED(CONFIG_PPC32)) 328 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ), 329 (loops_per_jiffy / (5000 / HZ)) % 100); 330 331 seq_printf(m, "\n"); 332 333 /* If this is the last cpu, print the summary */ 334 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 335 show_cpuinfo_summary(m); 336 337 return 0; 338 } 339 340 static void *c_start(struct seq_file *m, loff_t *pos) 341 { 342 if (*pos == 0) /* just in case, cpu 0 is not the first */ 343 *pos = cpumask_first(cpu_online_mask); 344 else 345 *pos = cpumask_next(*pos - 1, cpu_online_mask); 346 if ((*pos) < nr_cpu_ids) 347 return (void *)(unsigned long)(*pos + 1); 348 return NULL; 349 } 350 351 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 352 { 353 (*pos)++; 354 return c_start(m, pos); 355 } 356 357 static void c_stop(struct seq_file *m, void *v) 358 { 359 } 360 361 const struct seq_operations cpuinfo_op = { 362 .start = c_start, 363 .next = c_next, 364 .stop = c_stop, 365 .show = show_cpuinfo, 366 }; 367 368 void __init check_for_initrd(void) 369 { 370 #ifdef CONFIG_BLK_DEV_INITRD 371 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 372 initrd_start, initrd_end); 373 374 /* If we were passed an initrd, set the ROOT_DEV properly if the values 375 * look sensible. If not, clear initrd reference. 376 */ 377 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 378 initrd_end > initrd_start) 379 ROOT_DEV = Root_RAM0; 380 else 381 initrd_start = initrd_end = 0; 382 383 if (initrd_start) 384 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 385 386 DBG(" <- check_for_initrd()\n"); 387 #endif /* CONFIG_BLK_DEV_INITRD */ 388 } 389 390 #ifdef CONFIG_SMP 391 392 int threads_per_core, threads_per_subcore, threads_shift __read_mostly; 393 cpumask_t threads_core_mask __read_mostly; 394 EXPORT_SYMBOL_GPL(threads_per_core); 395 EXPORT_SYMBOL_GPL(threads_per_subcore); 396 EXPORT_SYMBOL_GPL(threads_shift); 397 EXPORT_SYMBOL_GPL(threads_core_mask); 398 399 static void __init cpu_init_thread_core_maps(int tpc) 400 { 401 int i; 402 403 threads_per_core = tpc; 404 threads_per_subcore = tpc; 405 cpumask_clear(&threads_core_mask); 406 407 /* This implementation only supports power of 2 number of threads 408 * for simplicity and performance 409 */ 410 threads_shift = ilog2(tpc); 411 BUG_ON(tpc != (1 << threads_shift)); 412 413 for (i = 0; i < tpc; i++) 414 cpumask_set_cpu(i, &threads_core_mask); 415 416 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 417 tpc, tpc > 1 ? "s" : ""); 418 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 419 } 420 421 422 u32 *cpu_to_phys_id = NULL; 423 424 /** 425 * setup_cpu_maps - initialize the following cpu maps: 426 * cpu_possible_mask 427 * cpu_present_mask 428 * 429 * Having the possible map set up early allows us to restrict allocations 430 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 431 * 432 * We do not initialize the online map here; cpus set their own bits in 433 * cpu_online_mask as they come up. 434 * 435 * This function is valid only for Open Firmware systems. finish_device_tree 436 * must be called before using this. 437 * 438 * While we're here, we may as well set the "physical" cpu ids in the paca. 439 * 440 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 441 */ 442 void __init smp_setup_cpu_maps(void) 443 { 444 struct device_node *dn; 445 int cpu = 0; 446 int nthreads = 1; 447 448 DBG("smp_setup_cpu_maps()\n"); 449 450 cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32), 451 __alignof__(u32)); 452 if (!cpu_to_phys_id) 453 panic("%s: Failed to allocate %zu bytes align=0x%zx\n", 454 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32)); 455 456 for_each_node_by_type(dn, "cpu") { 457 const __be32 *intserv; 458 __be32 cpu_be; 459 int j, len; 460 461 DBG(" * %pOF...\n", dn); 462 463 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 464 &len); 465 if (intserv) { 466 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 467 nthreads); 468 } else { 469 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 470 intserv = of_get_property(dn, "reg", &len); 471 if (!intserv) { 472 cpu_be = cpu_to_be32(cpu); 473 /* XXX: what is this? uninitialized?? */ 474 intserv = &cpu_be; /* assume logical == phys */ 475 len = 4; 476 } 477 } 478 479 nthreads = len / sizeof(int); 480 481 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 482 bool avail; 483 484 DBG(" thread %d -> cpu %d (hard id %d)\n", 485 j, cpu, be32_to_cpu(intserv[j])); 486 487 avail = of_device_is_available(dn); 488 if (!avail) 489 avail = !of_property_match_string(dn, 490 "enable-method", "spin-table"); 491 492 set_cpu_present(cpu, avail); 493 set_cpu_possible(cpu, true); 494 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); 495 cpu++; 496 } 497 498 if (cpu >= nr_cpu_ids) { 499 of_node_put(dn); 500 break; 501 } 502 } 503 504 /* If no SMT supported, nthreads is forced to 1 */ 505 if (!cpu_has_feature(CPU_FTR_SMT)) { 506 DBG(" SMT disabled ! nthreads forced to 1\n"); 507 nthreads = 1; 508 } 509 510 #ifdef CONFIG_PPC64 511 /* 512 * On pSeries LPAR, we need to know how many cpus 513 * could possibly be added to this partition. 514 */ 515 if (firmware_has_feature(FW_FEATURE_LPAR) && 516 (dn = of_find_node_by_path("/rtas"))) { 517 int num_addr_cell, num_size_cell, maxcpus; 518 const __be32 *ireg; 519 520 num_addr_cell = of_n_addr_cells(dn); 521 num_size_cell = of_n_size_cells(dn); 522 523 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 524 525 if (!ireg) 526 goto out; 527 528 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 529 530 /* Double maxcpus for processors which have SMT capability */ 531 if (cpu_has_feature(CPU_FTR_SMT)) 532 maxcpus *= nthreads; 533 534 if (maxcpus > nr_cpu_ids) { 535 printk(KERN_WARNING 536 "Partition configured for %d cpus, " 537 "operating system maximum is %u.\n", 538 maxcpus, nr_cpu_ids); 539 maxcpus = nr_cpu_ids; 540 } else 541 printk(KERN_INFO "Partition configured for %d cpus.\n", 542 maxcpus); 543 544 for (cpu = 0; cpu < maxcpus; cpu++) 545 set_cpu_possible(cpu, true); 546 out: 547 of_node_put(dn); 548 } 549 vdso_data->processorCount = num_present_cpus(); 550 #endif /* CONFIG_PPC64 */ 551 552 /* Initialize CPU <=> thread mapping/ 553 * 554 * WARNING: We assume that the number of threads is the same for 555 * every CPU in the system. If that is not the case, then some code 556 * here will have to be reworked 557 */ 558 cpu_init_thread_core_maps(nthreads); 559 560 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 561 setup_nr_cpu_ids(); 562 563 free_unused_pacas(); 564 } 565 #endif /* CONFIG_SMP */ 566 567 #ifdef CONFIG_PCSPKR_PLATFORM 568 static __init int add_pcspkr(void) 569 { 570 struct device_node *np; 571 struct platform_device *pd; 572 int ret; 573 574 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 575 of_node_put(np); 576 if (!np) 577 return -ENODEV; 578 579 pd = platform_device_alloc("pcspkr", -1); 580 if (!pd) 581 return -ENOMEM; 582 583 ret = platform_device_add(pd); 584 if (ret) 585 platform_device_put(pd); 586 587 return ret; 588 } 589 device_initcall(add_pcspkr); 590 #endif /* CONFIG_PCSPKR_PLATFORM */ 591 592 void probe_machine(void) 593 { 594 extern struct machdep_calls __machine_desc_start; 595 extern struct machdep_calls __machine_desc_end; 596 unsigned int i; 597 598 /* 599 * Iterate all ppc_md structures until we find the proper 600 * one for the current machine type 601 */ 602 DBG("Probing machine type ...\n"); 603 604 /* 605 * Check ppc_md is empty, if not we have a bug, ie, we setup an 606 * entry before probe_machine() which will be overwritten 607 */ 608 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 609 if (((void **)&ppc_md)[i]) { 610 printk(KERN_ERR "Entry %d in ppc_md non empty before" 611 " machine probe !\n", i); 612 } 613 } 614 615 for (machine_id = &__machine_desc_start; 616 machine_id < &__machine_desc_end; 617 machine_id++) { 618 DBG(" %s ...", machine_id->name); 619 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 620 if (ppc_md.probe()) { 621 DBG(" match !\n"); 622 break; 623 } 624 DBG("\n"); 625 } 626 /* What can we do if we didn't find ? */ 627 if (machine_id >= &__machine_desc_end) { 628 pr_err("No suitable machine description found !\n"); 629 for (;;); 630 } 631 632 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 633 } 634 635 /* Match a class of boards, not a specific device configuration. */ 636 int check_legacy_ioport(unsigned long base_port) 637 { 638 struct device_node *parent, *np = NULL; 639 int ret = -ENODEV; 640 641 switch(base_port) { 642 case I8042_DATA_REG: 643 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 644 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 645 if (np) { 646 parent = of_get_parent(np); 647 648 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 649 if (!of_i8042_kbd_irq) 650 of_i8042_kbd_irq = 1; 651 652 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 653 if (!of_i8042_aux_irq) 654 of_i8042_aux_irq = 12; 655 656 of_node_put(np); 657 np = parent; 658 break; 659 } 660 np = of_find_node_by_type(NULL, "8042"); 661 /* Pegasos has no device_type on its 8042 node, look for the 662 * name instead */ 663 if (!np) 664 np = of_find_node_by_name(NULL, "8042"); 665 if (np) { 666 of_i8042_kbd_irq = 1; 667 of_i8042_aux_irq = 12; 668 } 669 break; 670 case FDC_BASE: /* FDC1 */ 671 np = of_find_node_by_type(NULL, "fdc"); 672 break; 673 default: 674 /* ipmi is supposed to fail here */ 675 break; 676 } 677 if (!np) 678 return ret; 679 parent = of_get_parent(np); 680 if (parent) { 681 if (of_node_is_type(parent, "isa")) 682 ret = 0; 683 of_node_put(parent); 684 } 685 of_node_put(np); 686 return ret; 687 } 688 EXPORT_SYMBOL(check_legacy_ioport); 689 690 static int ppc_panic_event(struct notifier_block *this, 691 unsigned long event, void *ptr) 692 { 693 /* 694 * panic does a local_irq_disable, but we really 695 * want interrupts to be hard disabled. 696 */ 697 hard_irq_disable(); 698 699 /* 700 * If firmware-assisted dump has been registered then trigger 701 * firmware-assisted dump and let firmware handle everything else. 702 */ 703 crash_fadump(NULL, ptr); 704 if (ppc_md.panic) 705 ppc_md.panic(ptr); /* May not return */ 706 return NOTIFY_DONE; 707 } 708 709 static struct notifier_block ppc_panic_block = { 710 .notifier_call = ppc_panic_event, 711 .priority = INT_MIN /* may not return; must be done last */ 712 }; 713 714 /* 715 * Dump out kernel offset information on panic. 716 */ 717 static int dump_kernel_offset(struct notifier_block *self, unsigned long v, 718 void *p) 719 { 720 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", 721 kaslr_offset(), KERNELBASE); 722 723 return 0; 724 } 725 726 static struct notifier_block kernel_offset_notifier = { 727 .notifier_call = dump_kernel_offset 728 }; 729 730 void __init setup_panic(void) 731 { 732 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) 733 atomic_notifier_chain_register(&panic_notifier_list, 734 &kernel_offset_notifier); 735 736 /* PPC64 always does a hard irq disable in its panic handler */ 737 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic) 738 return; 739 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 740 } 741 742 #ifdef CONFIG_CHECK_CACHE_COHERENCY 743 /* 744 * For platforms that have configurable cache-coherency. This function 745 * checks that the cache coherency setting of the kernel matches the setting 746 * left by the firmware, as indicated in the device tree. Since a mismatch 747 * will eventually result in DMA failures, we print * and error and call 748 * BUG() in that case. 749 */ 750 751 #define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE)) 752 753 static int __init check_cache_coherency(void) 754 { 755 struct device_node *np; 756 const void *prop; 757 bool devtree_coherency; 758 759 np = of_find_node_by_path("/"); 760 prop = of_get_property(np, "coherency-off", NULL); 761 of_node_put(np); 762 763 devtree_coherency = prop ? false : true; 764 765 if (devtree_coherency != KERNEL_COHERENCY) { 766 printk(KERN_ERR 767 "kernel coherency:%s != device tree_coherency:%s\n", 768 KERNEL_COHERENCY ? "on" : "off", 769 devtree_coherency ? "on" : "off"); 770 BUG(); 771 } 772 773 return 0; 774 } 775 776 late_initcall(check_cache_coherency); 777 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 778 779 #ifdef CONFIG_DEBUG_FS 780 struct dentry *powerpc_debugfs_root; 781 EXPORT_SYMBOL(powerpc_debugfs_root); 782 783 static int powerpc_debugfs_init(void) 784 { 785 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 786 return 0; 787 } 788 arch_initcall(powerpc_debugfs_init); 789 #endif 790 791 void ppc_printk_progress(char *s, unsigned short hex) 792 { 793 pr_info("%s\n", s); 794 } 795 796 static __init void print_system_info(void) 797 { 798 pr_info("-----------------------------------------------------\n"); 799 pr_info("phys_mem_size = 0x%llx\n", 800 (unsigned long long)memblock_phys_mem_size()); 801 802 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 803 pr_info("icache_bsize = 0x%x\n", icache_bsize); 804 if (ucache_bsize != 0) 805 pr_info("ucache_bsize = 0x%x\n", ucache_bsize); 806 807 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 808 pr_info(" possible = 0x%016lx\n", 809 (unsigned long)CPU_FTRS_POSSIBLE); 810 pr_info(" always = 0x%016lx\n", 811 (unsigned long)CPU_FTRS_ALWAYS); 812 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 813 cur_cpu_spec->cpu_user_features, 814 cur_cpu_spec->cpu_user_features2); 815 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 816 #ifdef CONFIG_PPC64 817 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 818 #ifdef CONFIG_PPC_BOOK3S 819 pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START); 820 pr_info("IO start = 0x%lx\n", KERN_IO_START); 821 pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap); 822 #endif 823 #endif 824 825 if (!early_radix_enabled()) 826 print_system_hash_info(); 827 828 if (PHYSICAL_START > 0) 829 pr_info("physical_start = 0x%llx\n", 830 (unsigned long long)PHYSICAL_START); 831 pr_info("-----------------------------------------------------\n"); 832 } 833 834 #ifdef CONFIG_SMP 835 static void smp_setup_pacas(void) 836 { 837 int cpu; 838 839 for_each_possible_cpu(cpu) { 840 if (cpu == smp_processor_id()) 841 continue; 842 allocate_paca(cpu); 843 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); 844 } 845 846 memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32)); 847 cpu_to_phys_id = NULL; 848 } 849 #endif 850 851 /* 852 * Called into from start_kernel this initializes memblock, which is used 853 * to manage page allocation until mem_init is called. 854 */ 855 void __init setup_arch(char **cmdline_p) 856 { 857 kasan_init(); 858 859 *cmdline_p = boot_command_line; 860 861 /* Set a half-reasonable default so udelay does something sensible */ 862 loops_per_jiffy = 500000000 / HZ; 863 864 /* Unflatten the device-tree passed by prom_init or kexec */ 865 unflatten_device_tree(); 866 867 /* 868 * Initialize cache line/block info from device-tree (on ppc64) or 869 * just cputable (on ppc32). 870 */ 871 initialize_cache_info(); 872 873 /* Initialize RTAS if available. */ 874 rtas_initialize(); 875 876 /* Check if we have an initrd provided via the device-tree. */ 877 check_for_initrd(); 878 879 /* Probe the machine type, establish ppc_md. */ 880 probe_machine(); 881 882 /* Setup panic notifier if requested by the platform. */ 883 setup_panic(); 884 885 /* 886 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 887 * it from their respective probe() function. 888 */ 889 setup_power_save(); 890 891 /* Discover standard serial ports. */ 892 find_legacy_serial_ports(); 893 894 /* Register early console with the printk subsystem. */ 895 register_early_udbg_console(); 896 897 /* Setup the various CPU maps based on the device-tree. */ 898 smp_setup_cpu_maps(); 899 900 /* Initialize xmon. */ 901 xmon_setup(); 902 903 /* Check the SMT related command line arguments (ppc64). */ 904 check_smt_enabled(); 905 906 /* Parse memory topology */ 907 mem_topology_setup(); 908 909 /* 910 * Release secondary cpus out of their spinloops at 0x60 now that 911 * we can map physical -> logical CPU ids. 912 * 913 * Freescale Book3e parts spin in a loop provided by firmware, 914 * so smp_release_cpus() does nothing for them. 915 */ 916 #ifdef CONFIG_SMP 917 smp_setup_pacas(); 918 919 /* On BookE, setup per-core TLB data structures. */ 920 setup_tlb_core_data(); 921 922 smp_release_cpus(); 923 #endif 924 925 /* Print various info about the machine that has been gathered so far. */ 926 print_system_info(); 927 928 /* Reserve large chunks of memory for use by CMA for KVM. */ 929 kvm_cma_reserve(); 930 931 klp_init_thread_info(&init_task); 932 933 init_mm.start_code = (unsigned long)_stext; 934 init_mm.end_code = (unsigned long) _etext; 935 init_mm.end_data = (unsigned long) _edata; 936 init_mm.brk = klimit; 937 938 mm_iommu_init(&init_mm); 939 irqstack_early_init(); 940 exc_lvl_early_init(); 941 emergency_stack_init(); 942 943 initmem_init(); 944 945 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 946 947 if (ppc_md.setup_arch) 948 ppc_md.setup_arch(); 949 950 setup_barrier_nospec(); 951 setup_spectre_v2(); 952 953 paging_init(); 954 955 /* Initialize the MMU context management stuff. */ 956 mmu_context_init(); 957 958 /* Interrupt code needs to be 64K-aligned. */ 959 if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff) 960 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 961 (unsigned long)_stext); 962 } 963