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 #include <asm/mce.h> 68 69 #include "setup.h" 70 71 #ifdef DEBUG 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 94 unsigned long klimit = (unsigned long) _end; 95 96 /* 97 * This still seems to be needed... -- paulus 98 */ 99 struct screen_info screen_info = { 100 .orig_x = 0, 101 .orig_y = 25, 102 .orig_video_cols = 80, 103 .orig_video_lines = 25, 104 .orig_video_isVGA = 1, 105 .orig_video_points = 16 106 }; 107 #if defined(CONFIG_FB_VGA16_MODULE) 108 EXPORT_SYMBOL(screen_info); 109 #endif 110 111 /* Variables required to store legacy IO irq routing */ 112 int of_i8042_kbd_irq; 113 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); 114 int of_i8042_aux_irq; 115 EXPORT_SYMBOL_GPL(of_i8042_aux_irq); 116 117 #ifdef __DO_IRQ_CANON 118 /* XXX should go elsewhere eventually */ 119 int ppc_do_canonicalize_irqs; 120 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 121 #endif 122 123 #ifdef CONFIG_CRASH_CORE 124 /* This keeps a track of which one is the crashing cpu. */ 125 int crashing_cpu = -1; 126 #endif 127 128 /* also used by kexec */ 129 void machine_shutdown(void) 130 { 131 /* 132 * if fadump is active, cleanup the fadump registration before we 133 * shutdown. 134 */ 135 fadump_cleanup(); 136 137 if (ppc_md.machine_shutdown) 138 ppc_md.machine_shutdown(); 139 } 140 141 static void machine_hang(void) 142 { 143 pr_emerg("System Halted, OK to turn off power\n"); 144 local_irq_disable(); 145 while (1) 146 ; 147 } 148 149 void machine_restart(char *cmd) 150 { 151 machine_shutdown(); 152 if (ppc_md.restart) 153 ppc_md.restart(cmd); 154 155 smp_send_stop(); 156 157 do_kernel_restart(cmd); 158 mdelay(1000); 159 160 machine_hang(); 161 } 162 163 void machine_power_off(void) 164 { 165 machine_shutdown(); 166 if (pm_power_off) 167 pm_power_off(); 168 169 smp_send_stop(); 170 machine_hang(); 171 } 172 /* Used by the G5 thermal driver */ 173 EXPORT_SYMBOL_GPL(machine_power_off); 174 175 void (*pm_power_off)(void); 176 EXPORT_SYMBOL_GPL(pm_power_off); 177 178 void machine_halt(void) 179 { 180 machine_shutdown(); 181 if (ppc_md.halt) 182 ppc_md.halt(); 183 184 smp_send_stop(); 185 machine_hang(); 186 } 187 188 #ifdef CONFIG_SMP 189 DEFINE_PER_CPU(unsigned int, cpu_pvr); 190 #endif 191 192 static void show_cpuinfo_summary(struct seq_file *m) 193 { 194 struct device_node *root; 195 const char *model = NULL; 196 unsigned long bogosum = 0; 197 int i; 198 199 if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) { 200 for_each_online_cpu(i) 201 bogosum += loops_per_jiffy; 202 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 203 bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100); 204 } 205 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 206 if (ppc_md.name) 207 seq_printf(m, "platform\t: %s\n", ppc_md.name); 208 root = of_find_node_by_path("/"); 209 if (root) 210 model = of_get_property(root, "model", NULL); 211 if (model) 212 seq_printf(m, "model\t\t: %s\n", model); 213 of_node_put(root); 214 215 if (ppc_md.show_cpuinfo != NULL) 216 ppc_md.show_cpuinfo(m); 217 218 /* Display the amount of memory */ 219 if (IS_ENABLED(CONFIG_PPC32)) 220 seq_printf(m, "Memory\t\t: %d MB\n", 221 (unsigned int)(total_memory / (1024 * 1024))); 222 } 223 224 static int show_cpuinfo(struct seq_file *m, void *v) 225 { 226 unsigned long cpu_id = (unsigned long)v - 1; 227 unsigned int pvr; 228 unsigned long proc_freq; 229 unsigned short maj; 230 unsigned short min; 231 232 #ifdef CONFIG_SMP 233 pvr = per_cpu(cpu_pvr, cpu_id); 234 #else 235 pvr = mfspr(SPRN_PVR); 236 #endif 237 maj = (pvr >> 8) & 0xFF; 238 min = pvr & 0xFF; 239 240 seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id); 241 242 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) 243 seq_puts(m, cur_cpu_spec->cpu_name); 244 else 245 seq_printf(m, "unknown (%08x)", pvr); 246 247 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 248 seq_puts(m, ", altivec supported"); 249 250 seq_putc(m, '\n'); 251 252 #ifdef CONFIG_TAU 253 if (cpu_has_feature(CPU_FTR_TAU)) { 254 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) { 255 /* more straightforward, but potentially misleading */ 256 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 257 cpu_temp(cpu_id)); 258 } else { 259 /* show the actual temp sensor range */ 260 u32 temp; 261 temp = cpu_temp_both(cpu_id); 262 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 263 temp & 0xff, temp >> 16); 264 } 265 } 266 #endif /* CONFIG_TAU */ 267 268 /* 269 * Platforms that have variable clock rates, should implement 270 * the method ppc_md.get_proc_freq() that reports the clock 271 * rate of a given cpu. The rest can use ppc_proc_freq to 272 * report the clock rate that is same across all cpus. 273 */ 274 if (ppc_md.get_proc_freq) 275 proc_freq = ppc_md.get_proc_freq(cpu_id); 276 else 277 proc_freq = ppc_proc_freq; 278 279 if (proc_freq) 280 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 281 proc_freq / 1000000, proc_freq % 1000000); 282 283 if (ppc_md.show_percpuinfo != NULL) 284 ppc_md.show_percpuinfo(m, cpu_id); 285 286 /* If we are a Freescale core do a simple check so 287 * we dont have to keep adding cases in the future */ 288 if (PVR_VER(pvr) & 0x8000) { 289 switch (PVR_VER(pvr)) { 290 case 0x8000: /* 7441/7450/7451, Voyager */ 291 case 0x8001: /* 7445/7455, Apollo 6 */ 292 case 0x8002: /* 7447/7457, Apollo 7 */ 293 case 0x8003: /* 7447A, Apollo 7 PM */ 294 case 0x8004: /* 7448, Apollo 8 */ 295 case 0x800c: /* 7410, Nitro */ 296 maj = ((pvr >> 8) & 0xF); 297 min = PVR_MIN(pvr); 298 break; 299 default: /* e500/book-e */ 300 maj = PVR_MAJ(pvr); 301 min = PVR_MIN(pvr); 302 break; 303 } 304 } else { 305 switch (PVR_VER(pvr)) { 306 case 0x1008: /* 740P/750P ?? */ 307 maj = ((pvr >> 8) & 0xFF) - 1; 308 min = pvr & 0xFF; 309 break; 310 case 0x004e: /* POWER9 bits 12-15 give chip type */ 311 case 0x0080: /* POWER10 bit 12 gives SMT8/4 */ 312 maj = (pvr >> 8) & 0x0F; 313 min = pvr & 0xFF; 314 break; 315 default: 316 maj = (pvr >> 8) & 0xFF; 317 min = pvr & 0xFF; 318 break; 319 } 320 } 321 322 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 323 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 324 325 if (IS_ENABLED(CONFIG_PPC32)) 326 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ), 327 (loops_per_jiffy / (5000 / HZ)) % 100); 328 329 seq_putc(m, '\n'); 330 331 /* If this is the last cpu, print the summary */ 332 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 333 show_cpuinfo_summary(m); 334 335 return 0; 336 } 337 338 static void *c_start(struct seq_file *m, loff_t *pos) 339 { 340 if (*pos == 0) /* just in case, cpu 0 is not the first */ 341 *pos = cpumask_first(cpu_online_mask); 342 else 343 *pos = cpumask_next(*pos - 1, cpu_online_mask); 344 if ((*pos) < nr_cpu_ids) 345 return (void *)(unsigned long)(*pos + 1); 346 return NULL; 347 } 348 349 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 350 { 351 (*pos)++; 352 return c_start(m, pos); 353 } 354 355 static void c_stop(struct seq_file *m, void *v) 356 { 357 } 358 359 const struct seq_operations cpuinfo_op = { 360 .start = c_start, 361 .next = c_next, 362 .stop = c_stop, 363 .show = show_cpuinfo, 364 }; 365 366 void __init check_for_initrd(void) 367 { 368 #ifdef CONFIG_BLK_DEV_INITRD 369 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 370 initrd_start, initrd_end); 371 372 /* If we were passed an initrd, set the ROOT_DEV properly if the values 373 * look sensible. If not, clear initrd reference. 374 */ 375 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 376 initrd_end > initrd_start) 377 ROOT_DEV = Root_RAM0; 378 else 379 initrd_start = initrd_end = 0; 380 381 if (initrd_start) 382 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 383 384 DBG(" <- check_for_initrd()\n"); 385 #endif /* CONFIG_BLK_DEV_INITRD */ 386 } 387 388 #ifdef CONFIG_SMP 389 390 int threads_per_core, threads_per_subcore, threads_shift __read_mostly; 391 cpumask_t threads_core_mask __read_mostly; 392 EXPORT_SYMBOL_GPL(threads_per_core); 393 EXPORT_SYMBOL_GPL(threads_per_subcore); 394 EXPORT_SYMBOL_GPL(threads_shift); 395 EXPORT_SYMBOL_GPL(threads_core_mask); 396 397 static void __init cpu_init_thread_core_maps(int tpc) 398 { 399 int i; 400 401 threads_per_core = tpc; 402 threads_per_subcore = tpc; 403 cpumask_clear(&threads_core_mask); 404 405 /* This implementation only supports power of 2 number of threads 406 * for simplicity and performance 407 */ 408 threads_shift = ilog2(tpc); 409 BUG_ON(tpc != (1 << threads_shift)); 410 411 for (i = 0; i < tpc; i++) 412 cpumask_set_cpu(i, &threads_core_mask); 413 414 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 415 tpc, tpc > 1 ? "s" : ""); 416 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 417 } 418 419 420 u32 *cpu_to_phys_id = NULL; 421 422 /** 423 * setup_cpu_maps - initialize the following cpu maps: 424 * cpu_possible_mask 425 * cpu_present_mask 426 * 427 * Having the possible map set up early allows us to restrict allocations 428 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 429 * 430 * We do not initialize the online map here; cpus set their own bits in 431 * cpu_online_mask as they come up. 432 * 433 * This function is valid only for Open Firmware systems. finish_device_tree 434 * must be called before using this. 435 * 436 * While we're here, we may as well set the "physical" cpu ids in the paca. 437 * 438 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 439 */ 440 void __init smp_setup_cpu_maps(void) 441 { 442 struct device_node *dn; 443 int cpu = 0; 444 int nthreads = 1; 445 446 DBG("smp_setup_cpu_maps()\n"); 447 448 cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32), 449 __alignof__(u32)); 450 if (!cpu_to_phys_id) 451 panic("%s: Failed to allocate %zu bytes align=0x%zx\n", 452 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32)); 453 454 for_each_node_by_type(dn, "cpu") { 455 const __be32 *intserv; 456 __be32 cpu_be; 457 int j, len; 458 459 DBG(" * %pOF...\n", dn); 460 461 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 462 &len); 463 if (intserv) { 464 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 465 nthreads); 466 } else { 467 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 468 intserv = of_get_property(dn, "reg", &len); 469 if (!intserv) { 470 cpu_be = cpu_to_be32(cpu); 471 /* XXX: what is this? uninitialized?? */ 472 intserv = &cpu_be; /* assume logical == phys */ 473 len = 4; 474 } 475 } 476 477 nthreads = len / sizeof(int); 478 479 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 480 bool avail; 481 482 DBG(" thread %d -> cpu %d (hard id %d)\n", 483 j, cpu, be32_to_cpu(intserv[j])); 484 485 avail = of_device_is_available(dn); 486 if (!avail) 487 avail = !of_property_match_string(dn, 488 "enable-method", "spin-table"); 489 490 set_cpu_present(cpu, avail); 491 set_cpu_possible(cpu, true); 492 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); 493 cpu++; 494 } 495 496 if (cpu >= nr_cpu_ids) { 497 of_node_put(dn); 498 break; 499 } 500 } 501 502 /* If no SMT supported, nthreads is forced to 1 */ 503 if (!cpu_has_feature(CPU_FTR_SMT)) { 504 DBG(" SMT disabled ! nthreads forced to 1\n"); 505 nthreads = 1; 506 } 507 508 #ifdef CONFIG_PPC64 509 /* 510 * On pSeries LPAR, we need to know how many cpus 511 * could possibly be added to this partition. 512 */ 513 if (firmware_has_feature(FW_FEATURE_LPAR) && 514 (dn = of_find_node_by_path("/rtas"))) { 515 int num_addr_cell, num_size_cell, maxcpus; 516 const __be32 *ireg; 517 518 num_addr_cell = of_n_addr_cells(dn); 519 num_size_cell = of_n_size_cells(dn); 520 521 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 522 523 if (!ireg) 524 goto out; 525 526 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 527 528 /* Double maxcpus for processors which have SMT capability */ 529 if (cpu_has_feature(CPU_FTR_SMT)) 530 maxcpus *= nthreads; 531 532 if (maxcpus > nr_cpu_ids) { 533 printk(KERN_WARNING 534 "Partition configured for %d cpus, " 535 "operating system maximum is %u.\n", 536 maxcpus, nr_cpu_ids); 537 maxcpus = nr_cpu_ids; 538 } else 539 printk(KERN_INFO "Partition configured for %d cpus.\n", 540 maxcpus); 541 542 for (cpu = 0; cpu < maxcpus; cpu++) 543 set_cpu_possible(cpu, true); 544 out: 545 of_node_put(dn); 546 } 547 vdso_data->processorCount = num_present_cpus(); 548 #endif /* CONFIG_PPC64 */ 549 550 /* Initialize CPU <=> thread mapping/ 551 * 552 * WARNING: We assume that the number of threads is the same for 553 * every CPU in the system. If that is not the case, then some code 554 * here will have to be reworked 555 */ 556 cpu_init_thread_core_maps(nthreads); 557 558 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 559 setup_nr_cpu_ids(); 560 561 free_unused_pacas(); 562 } 563 #endif /* CONFIG_SMP */ 564 565 #ifdef CONFIG_PCSPKR_PLATFORM 566 static __init int add_pcspkr(void) 567 { 568 struct device_node *np; 569 struct platform_device *pd; 570 int ret; 571 572 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 573 of_node_put(np); 574 if (!np) 575 return -ENODEV; 576 577 pd = platform_device_alloc("pcspkr", -1); 578 if (!pd) 579 return -ENOMEM; 580 581 ret = platform_device_add(pd); 582 if (ret) 583 platform_device_put(pd); 584 585 return ret; 586 } 587 device_initcall(add_pcspkr); 588 #endif /* CONFIG_PCSPKR_PLATFORM */ 589 590 void probe_machine(void) 591 { 592 extern struct machdep_calls __machine_desc_start; 593 extern struct machdep_calls __machine_desc_end; 594 unsigned int i; 595 596 /* 597 * Iterate all ppc_md structures until we find the proper 598 * one for the current machine type 599 */ 600 DBG("Probing machine type ...\n"); 601 602 /* 603 * Check ppc_md is empty, if not we have a bug, ie, we setup an 604 * entry before probe_machine() which will be overwritten 605 */ 606 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 607 if (((void **)&ppc_md)[i]) { 608 printk(KERN_ERR "Entry %d in ppc_md non empty before" 609 " machine probe !\n", i); 610 } 611 } 612 613 for (machine_id = &__machine_desc_start; 614 machine_id < &__machine_desc_end; 615 machine_id++) { 616 DBG(" %s ...", machine_id->name); 617 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 618 if (ppc_md.probe()) { 619 DBG(" match !\n"); 620 break; 621 } 622 DBG("\n"); 623 } 624 /* What can we do if we didn't find ? */ 625 if (machine_id >= &__machine_desc_end) { 626 pr_err("No suitable machine description found !\n"); 627 for (;;); 628 } 629 630 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 631 } 632 633 /* Match a class of boards, not a specific device configuration. */ 634 int check_legacy_ioport(unsigned long base_port) 635 { 636 struct device_node *parent, *np = NULL; 637 int ret = -ENODEV; 638 639 switch(base_port) { 640 case I8042_DATA_REG: 641 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 642 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 643 if (np) { 644 parent = of_get_parent(np); 645 646 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 647 if (!of_i8042_kbd_irq) 648 of_i8042_kbd_irq = 1; 649 650 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 651 if (!of_i8042_aux_irq) 652 of_i8042_aux_irq = 12; 653 654 of_node_put(np); 655 np = parent; 656 break; 657 } 658 np = of_find_node_by_type(NULL, "8042"); 659 /* Pegasos has no device_type on its 8042 node, look for the 660 * name instead */ 661 if (!np) 662 np = of_find_node_by_name(NULL, "8042"); 663 if (np) { 664 of_i8042_kbd_irq = 1; 665 of_i8042_aux_irq = 12; 666 } 667 break; 668 case FDC_BASE: /* FDC1 */ 669 np = of_find_node_by_type(NULL, "fdc"); 670 break; 671 default: 672 /* ipmi is supposed to fail here */ 673 break; 674 } 675 if (!np) 676 return ret; 677 parent = of_get_parent(np); 678 if (parent) { 679 if (of_node_is_type(parent, "isa")) 680 ret = 0; 681 of_node_put(parent); 682 } 683 of_node_put(np); 684 return ret; 685 } 686 EXPORT_SYMBOL(check_legacy_ioport); 687 688 static int ppc_panic_event(struct notifier_block *this, 689 unsigned long event, void *ptr) 690 { 691 /* 692 * panic does a local_irq_disable, but we really 693 * want interrupts to be hard disabled. 694 */ 695 hard_irq_disable(); 696 697 /* 698 * If firmware-assisted dump has been registered then trigger 699 * firmware-assisted dump and let firmware handle everything else. 700 */ 701 crash_fadump(NULL, ptr); 702 if (ppc_md.panic) 703 ppc_md.panic(ptr); /* May not return */ 704 return NOTIFY_DONE; 705 } 706 707 static struct notifier_block ppc_panic_block = { 708 .notifier_call = ppc_panic_event, 709 .priority = INT_MIN /* may not return; must be done last */ 710 }; 711 712 /* 713 * Dump out kernel offset information on panic. 714 */ 715 static int dump_kernel_offset(struct notifier_block *self, unsigned long v, 716 void *p) 717 { 718 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", 719 kaslr_offset(), KERNELBASE); 720 721 return 0; 722 } 723 724 static struct notifier_block kernel_offset_notifier = { 725 .notifier_call = dump_kernel_offset 726 }; 727 728 void __init setup_panic(void) 729 { 730 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) 731 atomic_notifier_chain_register(&panic_notifier_list, 732 &kernel_offset_notifier); 733 734 /* PPC64 always does a hard irq disable in its panic handler */ 735 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic) 736 return; 737 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 738 } 739 740 #ifdef CONFIG_CHECK_CACHE_COHERENCY 741 /* 742 * For platforms that have configurable cache-coherency. This function 743 * checks that the cache coherency setting of the kernel matches the setting 744 * left by the firmware, as indicated in the device tree. Since a mismatch 745 * will eventually result in DMA failures, we print * and error and call 746 * BUG() in that case. 747 */ 748 749 #define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE)) 750 751 static int __init check_cache_coherency(void) 752 { 753 struct device_node *np; 754 const void *prop; 755 bool devtree_coherency; 756 757 np = of_find_node_by_path("/"); 758 prop = of_get_property(np, "coherency-off", NULL); 759 of_node_put(np); 760 761 devtree_coherency = prop ? false : true; 762 763 if (devtree_coherency != KERNEL_COHERENCY) { 764 printk(KERN_ERR 765 "kernel coherency:%s != device tree_coherency:%s\n", 766 KERNEL_COHERENCY ? "on" : "off", 767 devtree_coherency ? "on" : "off"); 768 BUG(); 769 } 770 771 return 0; 772 } 773 774 late_initcall(check_cache_coherency); 775 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 776 777 #ifdef CONFIG_DEBUG_FS 778 struct dentry *powerpc_debugfs_root; 779 EXPORT_SYMBOL(powerpc_debugfs_root); 780 781 static int powerpc_debugfs_init(void) 782 { 783 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 784 return 0; 785 } 786 arch_initcall(powerpc_debugfs_init); 787 #endif 788 789 void ppc_printk_progress(char *s, unsigned short hex) 790 { 791 pr_info("%s\n", s); 792 } 793 794 static __init void print_system_info(void) 795 { 796 pr_info("-----------------------------------------------------\n"); 797 pr_info("phys_mem_size = 0x%llx\n", 798 (unsigned long long)memblock_phys_mem_size()); 799 800 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 801 pr_info("icache_bsize = 0x%x\n", icache_bsize); 802 803 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 804 pr_info(" possible = 0x%016lx\n", 805 (unsigned long)CPU_FTRS_POSSIBLE); 806 pr_info(" always = 0x%016lx\n", 807 (unsigned long)CPU_FTRS_ALWAYS); 808 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 809 cur_cpu_spec->cpu_user_features, 810 cur_cpu_spec->cpu_user_features2); 811 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 812 #ifdef CONFIG_PPC64 813 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 814 #ifdef CONFIG_PPC_BOOK3S 815 pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START); 816 pr_info("IO start = 0x%lx\n", KERN_IO_START); 817 pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap); 818 #endif 819 #endif 820 821 if (!early_radix_enabled()) 822 print_system_hash_info(); 823 824 if (PHYSICAL_START > 0) 825 pr_info("physical_start = 0x%llx\n", 826 (unsigned long long)PHYSICAL_START); 827 pr_info("-----------------------------------------------------\n"); 828 } 829 830 #ifdef CONFIG_SMP 831 static void __init smp_setup_pacas(void) 832 { 833 int cpu; 834 835 for_each_possible_cpu(cpu) { 836 if (cpu == smp_processor_id()) 837 continue; 838 allocate_paca(cpu); 839 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); 840 } 841 842 memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32)); 843 cpu_to_phys_id = NULL; 844 } 845 #endif 846 847 /* 848 * Called into from start_kernel this initializes memblock, which is used 849 * to manage page allocation until mem_init is called. 850 */ 851 void __init setup_arch(char **cmdline_p) 852 { 853 kasan_init(); 854 855 *cmdline_p = boot_command_line; 856 857 /* Set a half-reasonable default so udelay does something sensible */ 858 loops_per_jiffy = 500000000 / HZ; 859 860 /* Unflatten the device-tree passed by prom_init or kexec */ 861 unflatten_device_tree(); 862 863 /* 864 * Initialize cache line/block info from device-tree (on ppc64) or 865 * just cputable (on ppc32). 866 */ 867 initialize_cache_info(); 868 869 /* Initialize RTAS if available. */ 870 rtas_initialize(); 871 872 /* Check if we have an initrd provided via the device-tree. */ 873 check_for_initrd(); 874 875 /* Probe the machine type, establish ppc_md. */ 876 probe_machine(); 877 878 /* Setup panic notifier if requested by the platform. */ 879 setup_panic(); 880 881 /* 882 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 883 * it from their respective probe() function. 884 */ 885 setup_power_save(); 886 887 /* Discover standard serial ports. */ 888 find_legacy_serial_ports(); 889 890 /* Register early console with the printk subsystem. */ 891 register_early_udbg_console(); 892 893 /* Setup the various CPU maps based on the device-tree. */ 894 smp_setup_cpu_maps(); 895 896 /* Initialize xmon. */ 897 xmon_setup(); 898 899 /* Check the SMT related command line arguments (ppc64). */ 900 check_smt_enabled(); 901 902 /* Parse memory topology */ 903 mem_topology_setup(); 904 905 /* 906 * Release secondary cpus out of their spinloops at 0x60 now that 907 * we can map physical -> logical CPU ids. 908 * 909 * Freescale Book3e parts spin in a loop provided by firmware, 910 * so smp_release_cpus() does nothing for them. 911 */ 912 #ifdef CONFIG_SMP 913 smp_setup_pacas(); 914 915 /* On BookE, setup per-core TLB data structures. */ 916 setup_tlb_core_data(); 917 #endif 918 919 /* Print various info about the machine that has been gathered so far. */ 920 print_system_info(); 921 922 /* Reserve large chunks of memory for use by CMA for KVM. */ 923 kvm_cma_reserve(); 924 925 /* Reserve large chunks of memory for us by CMA for hugetlb */ 926 gigantic_hugetlb_cma_reserve(); 927 928 klp_init_thread_info(&init_task); 929 930 init_mm.start_code = (unsigned long)_stext; 931 init_mm.end_code = (unsigned long) _etext; 932 init_mm.end_data = (unsigned long) _edata; 933 init_mm.brk = klimit; 934 935 mm_iommu_init(&init_mm); 936 irqstack_early_init(); 937 exc_lvl_early_init(); 938 emergency_stack_init(); 939 940 mce_init(); 941 smp_release_cpus(); 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