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/panic_notifier.h> 13 #include <linux/string.h> 14 #include <linux/sched.h> 15 #include <linux/init.h> 16 #include <linux/kernel.h> 17 #include <linux/reboot.h> 18 #include <linux/delay.h> 19 #include <linux/initrd.h> 20 #include <linux/platform_device.h> 21 #include <linux/seq_file.h> 22 #include <linux/ioport.h> 23 #include <linux/console.h> 24 #include <linux/screen_info.h> 25 #include <linux/root_dev.h> 26 #include <linux/notifier.h> 27 #include <linux/cpu.h> 28 #include <linux/unistd.h> 29 #include <linux/serial.h> 30 #include <linux/serial_8250.h> 31 #include <linux/percpu.h> 32 #include <linux/memblock.h> 33 #include <linux/of_platform.h> 34 #include <linux/hugetlb.h> 35 #include <linux/pgtable.h> 36 #include <asm/debugfs.h> 37 #include <asm/io.h> 38 #include <asm/paca.h> 39 #include <asm/prom.h> 40 #include <asm/processor.h> 41 #include <asm/vdso_datapage.h> 42 #include <asm/smp.h> 43 #include <asm/elf.h> 44 #include <asm/machdep.h> 45 #include <asm/time.h> 46 #include <asm/cputable.h> 47 #include <asm/sections.h> 48 #include <asm/firmware.h> 49 #include <asm/btext.h> 50 #include <asm/nvram.h> 51 #include <asm/setup.h> 52 #include <asm/rtas.h> 53 #include <asm/iommu.h> 54 #include <asm/serial.h> 55 #include <asm/cache.h> 56 #include <asm/page.h> 57 #include <asm/mmu.h> 58 #include <asm/xmon.h> 59 #include <asm/cputhreads.h> 60 #include <mm/mmu_decl.h> 61 #include <asm/fadump.h> 62 #include <asm/udbg.h> 63 #include <asm/hugetlb.h> 64 #include <asm/livepatch.h> 65 #include <asm/mmu_context.h> 66 #include <asm/cpu_has_feature.h> 67 #include <asm/kasan.h> 68 #include <asm/mce.h> 69 70 #include "setup.h" 71 72 #ifdef DEBUG 73 #define DBG(fmt...) udbg_printf(fmt) 74 #else 75 #define DBG(fmt...) 76 #endif 77 78 /* The main machine-dep calls structure 79 */ 80 struct machdep_calls ppc_md; 81 EXPORT_SYMBOL(ppc_md); 82 struct machdep_calls *machine_id; 83 EXPORT_SYMBOL(machine_id); 84 85 int boot_cpuid = -1; 86 EXPORT_SYMBOL_GPL(boot_cpuid); 87 88 /* 89 * These are used in binfmt_elf.c to put aux entries on the stack 90 * for each elf executable being started. 91 */ 92 int dcache_bsize; 93 int icache_bsize; 94 95 /* 96 * This still seems to be needed... -- paulus 97 */ 98 struct screen_info screen_info = { 99 .orig_x = 0, 100 .orig_y = 25, 101 .orig_video_cols = 80, 102 .orig_video_lines = 25, 103 .orig_video_isVGA = 1, 104 .orig_video_points = 16 105 }; 106 #if defined(CONFIG_FB_VGA16_MODULE) 107 EXPORT_SYMBOL(screen_info); 108 #endif 109 110 /* Variables required to store legacy IO irq routing */ 111 int of_i8042_kbd_irq; 112 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); 113 int of_i8042_aux_irq; 114 EXPORT_SYMBOL_GPL(of_i8042_aux_irq); 115 116 #ifdef __DO_IRQ_CANON 117 /* XXX should go elsewhere eventually */ 118 int ppc_do_canonicalize_irqs; 119 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 120 #endif 121 122 #ifdef CONFIG_CRASH_CORE 123 /* This keeps a track of which one is the crashing cpu. */ 124 int crashing_cpu = -1; 125 #endif 126 127 /* also used by kexec */ 128 void machine_shutdown(void) 129 { 130 /* 131 * if fadump is active, cleanup the fadump registration before we 132 * shutdown. 133 */ 134 fadump_cleanup(); 135 136 if (ppc_md.machine_shutdown) 137 ppc_md.machine_shutdown(); 138 } 139 140 static void machine_hang(void) 141 { 142 pr_emerg("System Halted, OK to turn off power\n"); 143 local_irq_disable(); 144 while (1) 145 ; 146 } 147 148 void machine_restart(char *cmd) 149 { 150 machine_shutdown(); 151 if (ppc_md.restart) 152 ppc_md.restart(cmd); 153 154 smp_send_stop(); 155 156 do_kernel_restart(cmd); 157 mdelay(1000); 158 159 machine_hang(); 160 } 161 162 void machine_power_off(void) 163 { 164 machine_shutdown(); 165 if (pm_power_off) 166 pm_power_off(); 167 168 smp_send_stop(); 169 machine_hang(); 170 } 171 /* Used by the G5 thermal driver */ 172 EXPORT_SYMBOL_GPL(machine_power_off); 173 174 void (*pm_power_off)(void); 175 EXPORT_SYMBOL_GPL(pm_power_off); 176 177 void machine_halt(void) 178 { 179 machine_shutdown(); 180 if (ppc_md.halt) 181 ppc_md.halt(); 182 183 smp_send_stop(); 184 machine_hang(); 185 } 186 187 #ifdef CONFIG_SMP 188 DEFINE_PER_CPU(unsigned int, cpu_pvr); 189 #endif 190 191 static void show_cpuinfo_summary(struct seq_file *m) 192 { 193 struct device_node *root; 194 const char *model = NULL; 195 unsigned long bogosum = 0; 196 int i; 197 198 if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) { 199 for_each_online_cpu(i) 200 bogosum += loops_per_jiffy; 201 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 202 bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100); 203 } 204 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 205 if (ppc_md.name) 206 seq_printf(m, "platform\t: %s\n", ppc_md.name); 207 root = of_find_node_by_path("/"); 208 if (root) 209 model = of_get_property(root, "model", NULL); 210 if (model) 211 seq_printf(m, "model\t\t: %s\n", model); 212 of_node_put(root); 213 214 if (ppc_md.show_cpuinfo != NULL) 215 ppc_md.show_cpuinfo(m); 216 217 /* Display the amount of memory */ 218 if (IS_ENABLED(CONFIG_PPC32)) 219 seq_printf(m, "Memory\t\t: %d MB\n", 220 (unsigned int)(total_memory / (1024 * 1024))); 221 } 222 223 static int show_cpuinfo(struct seq_file *m, void *v) 224 { 225 unsigned long cpu_id = (unsigned long)v - 1; 226 unsigned int pvr; 227 unsigned long proc_freq; 228 unsigned short maj; 229 unsigned short min; 230 231 #ifdef CONFIG_SMP 232 pvr = per_cpu(cpu_pvr, cpu_id); 233 #else 234 pvr = mfspr(SPRN_PVR); 235 #endif 236 maj = (pvr >> 8) & 0xFF; 237 min = pvr & 0xFF; 238 239 seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id); 240 241 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) 242 seq_puts(m, cur_cpu_spec->cpu_name); 243 else 244 seq_printf(m, "unknown (%08x)", pvr); 245 246 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 247 seq_puts(m, ", altivec supported"); 248 249 seq_putc(m, '\n'); 250 251 #ifdef CONFIG_TAU 252 if (cpu_has_feature(CPU_FTR_TAU)) { 253 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) { 254 /* more straightforward, but potentially misleading */ 255 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 256 cpu_temp(cpu_id)); 257 } else { 258 /* show the actual temp sensor range */ 259 u32 temp; 260 temp = cpu_temp_both(cpu_id); 261 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 262 temp & 0xff, temp >> 16); 263 } 264 } 265 #endif /* CONFIG_TAU */ 266 267 /* 268 * Platforms that have variable clock rates, should implement 269 * the method ppc_md.get_proc_freq() that reports the clock 270 * rate of a given cpu. The rest can use ppc_proc_freq to 271 * report the clock rate that is same across all cpus. 272 */ 273 if (ppc_md.get_proc_freq) 274 proc_freq = ppc_md.get_proc_freq(cpu_id); 275 else 276 proc_freq = ppc_proc_freq; 277 278 if (proc_freq) 279 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 280 proc_freq / 1000000, proc_freq % 1000000); 281 282 if (ppc_md.show_percpuinfo != NULL) 283 ppc_md.show_percpuinfo(m, cpu_id); 284 285 /* If we are a Freescale core do a simple check so 286 * we dont have to keep adding cases in the future */ 287 if (PVR_VER(pvr) & 0x8000) { 288 switch (PVR_VER(pvr)) { 289 case 0x8000: /* 7441/7450/7451, Voyager */ 290 case 0x8001: /* 7445/7455, Apollo 6 */ 291 case 0x8002: /* 7447/7457, Apollo 7 */ 292 case 0x8003: /* 7447A, Apollo 7 PM */ 293 case 0x8004: /* 7448, Apollo 8 */ 294 case 0x800c: /* 7410, Nitro */ 295 maj = ((pvr >> 8) & 0xF); 296 min = PVR_MIN(pvr); 297 break; 298 default: /* e500/book-e */ 299 maj = PVR_MAJ(pvr); 300 min = PVR_MIN(pvr); 301 break; 302 } 303 } else { 304 switch (PVR_VER(pvr)) { 305 case 0x1008: /* 740P/750P ?? */ 306 maj = ((pvr >> 8) & 0xFF) - 1; 307 min = pvr & 0xFF; 308 break; 309 case 0x004e: /* POWER9 bits 12-15 give chip type */ 310 case 0x0080: /* POWER10 bit 12 gives SMT8/4 */ 311 maj = (pvr >> 8) & 0x0F; 312 min = pvr & 0xFF; 313 break; 314 default: 315 maj = (pvr >> 8) & 0xFF; 316 min = pvr & 0xFF; 317 break; 318 } 319 } 320 321 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 322 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 323 324 if (IS_ENABLED(CONFIG_PPC32)) 325 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ), 326 (loops_per_jiffy / (5000 / HZ)) % 100); 327 328 seq_putc(m, '\n'); 329 330 /* If this is the last cpu, print the summary */ 331 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 332 show_cpuinfo_summary(m); 333 334 return 0; 335 } 336 337 static void *c_start(struct seq_file *m, loff_t *pos) 338 { 339 if (*pos == 0) /* just in case, cpu 0 is not the first */ 340 *pos = cpumask_first(cpu_online_mask); 341 else 342 *pos = cpumask_next(*pos - 1, cpu_online_mask); 343 if ((*pos) < nr_cpu_ids) 344 return (void *)(unsigned long)(*pos + 1); 345 return NULL; 346 } 347 348 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 349 { 350 (*pos)++; 351 return c_start(m, pos); 352 } 353 354 static void c_stop(struct seq_file *m, void *v) 355 { 356 } 357 358 const struct seq_operations cpuinfo_op = { 359 .start = c_start, 360 .next = c_next, 361 .stop = c_stop, 362 .show = show_cpuinfo, 363 }; 364 365 void __init check_for_initrd(void) 366 { 367 #ifdef CONFIG_BLK_DEV_INITRD 368 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 369 initrd_start, initrd_end); 370 371 /* If we were passed an initrd, set the ROOT_DEV properly if the values 372 * look sensible. If not, clear initrd reference. 373 */ 374 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 375 initrd_end > initrd_start) 376 ROOT_DEV = Root_RAM0; 377 else 378 initrd_start = initrd_end = 0; 379 380 if (initrd_start) 381 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 382 383 DBG(" <- check_for_initrd()\n"); 384 #endif /* CONFIG_BLK_DEV_INITRD */ 385 } 386 387 #ifdef CONFIG_SMP 388 389 int threads_per_core, threads_per_subcore, threads_shift __read_mostly; 390 cpumask_t threads_core_mask __read_mostly; 391 EXPORT_SYMBOL_GPL(threads_per_core); 392 EXPORT_SYMBOL_GPL(threads_per_subcore); 393 EXPORT_SYMBOL_GPL(threads_shift); 394 EXPORT_SYMBOL_GPL(threads_core_mask); 395 396 static void __init cpu_init_thread_core_maps(int tpc) 397 { 398 int i; 399 400 threads_per_core = tpc; 401 threads_per_subcore = tpc; 402 cpumask_clear(&threads_core_mask); 403 404 /* This implementation only supports power of 2 number of threads 405 * for simplicity and performance 406 */ 407 threads_shift = ilog2(tpc); 408 BUG_ON(tpc != (1 << threads_shift)); 409 410 for (i = 0; i < tpc; i++) 411 cpumask_set_cpu(i, &threads_core_mask); 412 413 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 414 tpc, tpc > 1 ? "s" : ""); 415 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 416 } 417 418 419 u32 *cpu_to_phys_id = NULL; 420 421 /** 422 * setup_cpu_maps - initialize the following cpu maps: 423 * cpu_possible_mask 424 * cpu_present_mask 425 * 426 * Having the possible map set up early allows us to restrict allocations 427 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 428 * 429 * We do not initialize the online map here; cpus set their own bits in 430 * cpu_online_mask as they come up. 431 * 432 * This function is valid only for Open Firmware systems. finish_device_tree 433 * must be called before using this. 434 * 435 * While we're here, we may as well set the "physical" cpu ids in the paca. 436 * 437 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 438 */ 439 void __init smp_setup_cpu_maps(void) 440 { 441 struct device_node *dn; 442 int cpu = 0; 443 int nthreads = 1; 444 445 DBG("smp_setup_cpu_maps()\n"); 446 447 cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32), 448 __alignof__(u32)); 449 if (!cpu_to_phys_id) 450 panic("%s: Failed to allocate %zu bytes align=0x%zx\n", 451 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32)); 452 453 for_each_node_by_type(dn, "cpu") { 454 const __be32 *intserv; 455 __be32 cpu_be; 456 int j, len; 457 458 DBG(" * %pOF...\n", dn); 459 460 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 461 &len); 462 if (intserv) { 463 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 464 nthreads); 465 } else { 466 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 467 intserv = of_get_property(dn, "reg", &len); 468 if (!intserv) { 469 cpu_be = cpu_to_be32(cpu); 470 /* XXX: what is this? uninitialized?? */ 471 intserv = &cpu_be; /* assume logical == phys */ 472 len = 4; 473 } 474 } 475 476 nthreads = len / sizeof(int); 477 478 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 479 bool avail; 480 481 DBG(" thread %d -> cpu %d (hard id %d)\n", 482 j, cpu, be32_to_cpu(intserv[j])); 483 484 avail = of_device_is_available(dn); 485 if (!avail) 486 avail = !of_property_match_string(dn, 487 "enable-method", "spin-table"); 488 489 set_cpu_present(cpu, avail); 490 set_cpu_possible(cpu, true); 491 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); 492 cpu++; 493 } 494 495 if (cpu >= nr_cpu_ids) { 496 of_node_put(dn); 497 break; 498 } 499 } 500 501 /* If no SMT supported, nthreads is forced to 1 */ 502 if (!cpu_has_feature(CPU_FTR_SMT)) { 503 DBG(" SMT disabled ! nthreads forced to 1\n"); 504 nthreads = 1; 505 } 506 507 #ifdef CONFIG_PPC64 508 /* 509 * On pSeries LPAR, we need to know how many cpus 510 * could possibly be added to this partition. 511 */ 512 if (firmware_has_feature(FW_FEATURE_LPAR) && 513 (dn = of_find_node_by_path("/rtas"))) { 514 int num_addr_cell, num_size_cell, maxcpus; 515 const __be32 *ireg; 516 517 num_addr_cell = of_n_addr_cells(dn); 518 num_size_cell = of_n_size_cells(dn); 519 520 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 521 522 if (!ireg) 523 goto out; 524 525 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 526 527 /* Double maxcpus for processors which have SMT capability */ 528 if (cpu_has_feature(CPU_FTR_SMT)) 529 maxcpus *= nthreads; 530 531 if (maxcpus > nr_cpu_ids) { 532 printk(KERN_WARNING 533 "Partition configured for %d cpus, " 534 "operating system maximum is %u.\n", 535 maxcpus, nr_cpu_ids); 536 maxcpus = nr_cpu_ids; 537 } else 538 printk(KERN_INFO "Partition configured for %d cpus.\n", 539 maxcpus); 540 541 for (cpu = 0; cpu < maxcpus; cpu++) 542 set_cpu_possible(cpu, true); 543 out: 544 of_node_put(dn); 545 } 546 vdso_data->processorCount = num_present_cpus(); 547 #endif /* CONFIG_PPC64 */ 548 549 /* Initialize CPU <=> thread mapping/ 550 * 551 * WARNING: We assume that the number of threads is the same for 552 * every CPU in the system. If that is not the case, then some code 553 * here will have to be reworked 554 */ 555 cpu_init_thread_core_maps(nthreads); 556 557 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 558 setup_nr_cpu_ids(); 559 560 free_unused_pacas(); 561 } 562 #endif /* CONFIG_SMP */ 563 564 #ifdef CONFIG_PCSPKR_PLATFORM 565 static __init int add_pcspkr(void) 566 { 567 struct device_node *np; 568 struct platform_device *pd; 569 int ret; 570 571 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 572 of_node_put(np); 573 if (!np) 574 return -ENODEV; 575 576 pd = platform_device_alloc("pcspkr", -1); 577 if (!pd) 578 return -ENOMEM; 579 580 ret = platform_device_add(pd); 581 if (ret) 582 platform_device_put(pd); 583 584 return ret; 585 } 586 device_initcall(add_pcspkr); 587 #endif /* CONFIG_PCSPKR_PLATFORM */ 588 589 void probe_machine(void) 590 { 591 extern struct machdep_calls __machine_desc_start; 592 extern struct machdep_calls __machine_desc_end; 593 unsigned int i; 594 595 /* 596 * Iterate all ppc_md structures until we find the proper 597 * one for the current machine type 598 */ 599 DBG("Probing machine type ...\n"); 600 601 /* 602 * Check ppc_md is empty, if not we have a bug, ie, we setup an 603 * entry before probe_machine() which will be overwritten 604 */ 605 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 606 if (((void **)&ppc_md)[i]) { 607 printk(KERN_ERR "Entry %d in ppc_md non empty before" 608 " machine probe !\n", i); 609 } 610 } 611 612 for (machine_id = &__machine_desc_start; 613 machine_id < &__machine_desc_end; 614 machine_id++) { 615 DBG(" %s ...", machine_id->name); 616 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 617 if (ppc_md.probe()) { 618 DBG(" match !\n"); 619 break; 620 } 621 DBG("\n"); 622 } 623 /* What can we do if we didn't find ? */ 624 if (machine_id >= &__machine_desc_end) { 625 pr_err("No suitable machine description found !\n"); 626 for (;;); 627 } 628 629 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 630 } 631 632 /* Match a class of boards, not a specific device configuration. */ 633 int check_legacy_ioport(unsigned long base_port) 634 { 635 struct device_node *parent, *np = NULL; 636 int ret = -ENODEV; 637 638 switch(base_port) { 639 case I8042_DATA_REG: 640 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 641 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 642 if (np) { 643 parent = of_get_parent(np); 644 645 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 646 if (!of_i8042_kbd_irq) 647 of_i8042_kbd_irq = 1; 648 649 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 650 if (!of_i8042_aux_irq) 651 of_i8042_aux_irq = 12; 652 653 of_node_put(np); 654 np = parent; 655 break; 656 } 657 np = of_find_node_by_type(NULL, "8042"); 658 /* Pegasos has no device_type on its 8042 node, look for the 659 * name instead */ 660 if (!np) 661 np = of_find_node_by_name(NULL, "8042"); 662 if (np) { 663 of_i8042_kbd_irq = 1; 664 of_i8042_aux_irq = 12; 665 } 666 break; 667 case FDC_BASE: /* FDC1 */ 668 np = of_find_node_by_type(NULL, "fdc"); 669 break; 670 default: 671 /* ipmi is supposed to fail here */ 672 break; 673 } 674 if (!np) 675 return ret; 676 parent = of_get_parent(np); 677 if (parent) { 678 if (of_node_is_type(parent, "isa")) 679 ret = 0; 680 of_node_put(parent); 681 } 682 of_node_put(np); 683 return ret; 684 } 685 EXPORT_SYMBOL(check_legacy_ioport); 686 687 static int ppc_panic_event(struct notifier_block *this, 688 unsigned long event, void *ptr) 689 { 690 /* 691 * panic does a local_irq_disable, but we really 692 * want interrupts to be hard disabled. 693 */ 694 hard_irq_disable(); 695 696 /* 697 * If firmware-assisted dump has been registered then trigger 698 * firmware-assisted dump and let firmware handle everything else. 699 */ 700 crash_fadump(NULL, ptr); 701 if (ppc_md.panic) 702 ppc_md.panic(ptr); /* May not return */ 703 return NOTIFY_DONE; 704 } 705 706 static struct notifier_block ppc_panic_block = { 707 .notifier_call = ppc_panic_event, 708 .priority = INT_MIN /* may not return; must be done last */ 709 }; 710 711 /* 712 * Dump out kernel offset information on panic. 713 */ 714 static int dump_kernel_offset(struct notifier_block *self, unsigned long v, 715 void *p) 716 { 717 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", 718 kaslr_offset(), KERNELBASE); 719 720 return 0; 721 } 722 723 static struct notifier_block kernel_offset_notifier = { 724 .notifier_call = dump_kernel_offset 725 }; 726 727 void __init setup_panic(void) 728 { 729 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) 730 atomic_notifier_chain_register(&panic_notifier_list, 731 &kernel_offset_notifier); 732 733 /* PPC64 always does a hard irq disable in its panic handler */ 734 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic) 735 return; 736 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 737 } 738 739 #ifdef CONFIG_CHECK_CACHE_COHERENCY 740 /* 741 * For platforms that have configurable cache-coherency. This function 742 * checks that the cache coherency setting of the kernel matches the setting 743 * left by the firmware, as indicated in the device tree. Since a mismatch 744 * will eventually result in DMA failures, we print * and error and call 745 * BUG() in that case. 746 */ 747 748 #define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE)) 749 750 static int __init check_cache_coherency(void) 751 { 752 struct device_node *np; 753 const void *prop; 754 bool devtree_coherency; 755 756 np = of_find_node_by_path("/"); 757 prop = of_get_property(np, "coherency-off", NULL); 758 of_node_put(np); 759 760 devtree_coherency = prop ? false : true; 761 762 if (devtree_coherency != KERNEL_COHERENCY) { 763 printk(KERN_ERR 764 "kernel coherency:%s != device tree_coherency:%s\n", 765 KERNEL_COHERENCY ? "on" : "off", 766 devtree_coherency ? "on" : "off"); 767 BUG(); 768 } 769 770 return 0; 771 } 772 773 late_initcall(check_cache_coherency); 774 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 775 776 #ifdef CONFIG_DEBUG_FS 777 struct dentry *powerpc_debugfs_root; 778 EXPORT_SYMBOL(powerpc_debugfs_root); 779 780 static int powerpc_debugfs_init(void) 781 { 782 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 783 return 0; 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 static __init void print_system_info(void) 794 { 795 pr_info("-----------------------------------------------------\n"); 796 pr_info("phys_mem_size = 0x%llx\n", 797 (unsigned long long)memblock_phys_mem_size()); 798 799 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 800 pr_info("icache_bsize = 0x%x\n", icache_bsize); 801 802 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 803 pr_info(" possible = 0x%016lx\n", 804 (unsigned long)CPU_FTRS_POSSIBLE); 805 pr_info(" always = 0x%016lx\n", 806 (unsigned long)CPU_FTRS_ALWAYS); 807 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 808 cur_cpu_spec->cpu_user_features, 809 cur_cpu_spec->cpu_user_features2); 810 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 811 #ifdef CONFIG_PPC64 812 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 813 #ifdef CONFIG_PPC_BOOK3S 814 pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START); 815 pr_info("IO start = 0x%lx\n", KERN_IO_START); 816 pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap); 817 #endif 818 #endif 819 820 if (!early_radix_enabled()) 821 print_system_hash_info(); 822 823 if (PHYSICAL_START > 0) 824 pr_info("physical_start = 0x%llx\n", 825 (unsigned long long)PHYSICAL_START); 826 pr_info("-----------------------------------------------------\n"); 827 } 828 829 #ifdef CONFIG_SMP 830 static void __init smp_setup_pacas(void) 831 { 832 int cpu; 833 834 for_each_possible_cpu(cpu) { 835 if (cpu == smp_processor_id()) 836 continue; 837 allocate_paca(cpu); 838 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); 839 } 840 841 memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32)); 842 cpu_to_phys_id = NULL; 843 } 844 #endif 845 846 /* 847 * Called into from start_kernel this initializes memblock, which is used 848 * to manage page allocation until mem_init is called. 849 */ 850 void __init setup_arch(char **cmdline_p) 851 { 852 kasan_init(); 853 854 *cmdline_p = boot_command_line; 855 856 /* Set a half-reasonable default so udelay does something sensible */ 857 loops_per_jiffy = 500000000 / HZ; 858 859 /* Unflatten the device-tree passed by prom_init or kexec */ 860 unflatten_device_tree(); 861 862 /* 863 * Initialize cache line/block info from device-tree (on ppc64) or 864 * just cputable (on ppc32). 865 */ 866 initialize_cache_info(); 867 868 /* Initialize RTAS if available. */ 869 rtas_initialize(); 870 871 /* Check if we have an initrd provided via the device-tree. */ 872 check_for_initrd(); 873 874 /* Probe the machine type, establish ppc_md. */ 875 probe_machine(); 876 877 /* Setup panic notifier if requested by the platform. */ 878 setup_panic(); 879 880 /* 881 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 882 * it from their respective probe() function. 883 */ 884 setup_power_save(); 885 886 /* Discover standard serial ports. */ 887 find_legacy_serial_ports(); 888 889 /* Register early console with the printk subsystem. */ 890 register_early_udbg_console(); 891 892 /* Setup the various CPU maps based on the device-tree. */ 893 smp_setup_cpu_maps(); 894 895 /* Initialize xmon. */ 896 xmon_setup(); 897 898 /* Check the SMT related command line arguments (ppc64). */ 899 check_smt_enabled(); 900 901 /* Parse memory topology */ 902 mem_topology_setup(); 903 904 /* 905 * Release secondary cpus out of their spinloops at 0x60 now that 906 * we can map physical -> logical CPU ids. 907 * 908 * Freescale Book3e parts spin in a loop provided by firmware, 909 * so smp_release_cpus() does nothing for them. 910 */ 911 #ifdef CONFIG_SMP 912 smp_setup_pacas(); 913 914 /* On BookE, setup per-core TLB data structures. */ 915 setup_tlb_core_data(); 916 #endif 917 918 /* Print various info about the machine that has been gathered so far. */ 919 print_system_info(); 920 921 /* Reserve large chunks of memory for use by CMA for KVM. */ 922 kvm_cma_reserve(); 923 924 /* Reserve large chunks of memory for us by CMA for hugetlb */ 925 gigantic_hugetlb_cma_reserve(); 926 927 klp_init_thread_info(&init_task); 928 929 setup_initial_init_mm(_stext, _etext, _edata, _end); 930 931 mm_iommu_init(&init_mm); 932 irqstack_early_init(); 933 exc_lvl_early_init(); 934 emergency_stack_init(); 935 936 mce_init(); 937 smp_release_cpus(); 938 939 initmem_init(); 940 941 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 942 943 if (ppc_md.setup_arch) 944 ppc_md.setup_arch(); 945 946 setup_barrier_nospec(); 947 setup_spectre_v2(); 948 949 paging_init(); 950 951 /* Initialize the MMU context management stuff. */ 952 mmu_context_init(); 953 954 /* Interrupt code needs to be 64K-aligned. */ 955 if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff) 956 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 957 (unsigned long)_stext); 958 } 959