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/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_irq.h> 33 #include <linux/of_fdt.h> 34 #include <linux/of_platform.h> 35 #include <linux/hugetlb.h> 36 #include <linux/pgtable.h> 37 #include <asm/io.h> 38 #include <asm/paca.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 /* 95 * This still seems to be needed... -- paulus 96 */ 97 struct screen_info screen_info = { 98 .orig_x = 0, 99 .orig_y = 25, 100 .orig_video_cols = 80, 101 .orig_video_lines = 25, 102 .orig_video_isVGA = 1, 103 .orig_video_points = 16 104 }; 105 #if defined(CONFIG_FB_VGA16_MODULE) 106 EXPORT_SYMBOL(screen_info); 107 #endif 108 109 /* Variables required to store legacy IO irq routing */ 110 int of_i8042_kbd_irq; 111 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); 112 int of_i8042_aux_irq; 113 EXPORT_SYMBOL_GPL(of_i8042_aux_irq); 114 115 #ifdef __DO_IRQ_CANON 116 /* XXX should go elsewhere eventually */ 117 int ppc_do_canonicalize_irqs; 118 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 119 #endif 120 121 #ifdef CONFIG_CRASH_CORE 122 /* This keeps a track of which one is the crashing cpu. */ 123 int crashing_cpu = -1; 124 #endif 125 126 /* also used by kexec */ 127 void machine_shutdown(void) 128 { 129 /* 130 * if fadump is active, cleanup the fadump registration before we 131 * shutdown. 132 */ 133 fadump_cleanup(); 134 135 if (ppc_md.machine_shutdown) 136 ppc_md.machine_shutdown(); 137 } 138 139 static void machine_hang(void) 140 { 141 pr_emerg("System Halted, OK to turn off power\n"); 142 local_irq_disable(); 143 while (1) 144 ; 145 } 146 147 void machine_restart(char *cmd) 148 { 149 machine_shutdown(); 150 if (ppc_md.restart) 151 ppc_md.restart(cmd); 152 153 smp_send_stop(); 154 155 do_kernel_restart(cmd); 156 mdelay(1000); 157 158 machine_hang(); 159 } 160 161 void machine_power_off(void) 162 { 163 machine_shutdown(); 164 do_kernel_power_off(); 165 smp_send_stop(); 166 machine_hang(); 167 } 168 /* Used by the G5 thermal driver */ 169 EXPORT_SYMBOL_GPL(machine_power_off); 170 171 void (*pm_power_off)(void); 172 EXPORT_SYMBOL_GPL(pm_power_off); 173 174 size_t __must_check arch_get_random_seed_longs(unsigned long *v, size_t max_longs) 175 { 176 if (max_longs && ppc_md.get_random_seed && ppc_md.get_random_seed(v)) 177 return 1; 178 return 0; 179 } 180 EXPORT_SYMBOL(arch_get_random_seed_longs); 181 182 void machine_halt(void) 183 { 184 machine_shutdown(); 185 if (ppc_md.halt) 186 ppc_md.halt(); 187 188 smp_send_stop(); 189 machine_hang(); 190 } 191 192 #ifdef CONFIG_SMP 193 DEFINE_PER_CPU(unsigned int, cpu_pvr); 194 #endif 195 196 static void show_cpuinfo_summary(struct seq_file *m) 197 { 198 struct device_node *root; 199 const char *model = NULL; 200 unsigned long bogosum = 0; 201 int i; 202 203 if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) { 204 for_each_online_cpu(i) 205 bogosum += loops_per_jiffy; 206 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 207 bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100); 208 } 209 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 210 if (ppc_md.name) 211 seq_printf(m, "platform\t: %s\n", ppc_md.name); 212 root = of_find_node_by_path("/"); 213 if (root) 214 model = of_get_property(root, "model", NULL); 215 if (model) 216 seq_printf(m, "model\t\t: %s\n", model); 217 of_node_put(root); 218 219 if (ppc_md.show_cpuinfo != NULL) 220 ppc_md.show_cpuinfo(m); 221 222 /* Display the amount of memory */ 223 if (IS_ENABLED(CONFIG_PPC32)) 224 seq_printf(m, "Memory\t\t: %d MB\n", 225 (unsigned int)(total_memory / (1024 * 1024))); 226 } 227 228 static int show_cpuinfo(struct seq_file *m, void *v) 229 { 230 unsigned long cpu_id = (unsigned long)v - 1; 231 unsigned int pvr; 232 unsigned long proc_freq; 233 unsigned short maj; 234 unsigned short min; 235 236 #ifdef CONFIG_SMP 237 pvr = per_cpu(cpu_pvr, cpu_id); 238 #else 239 pvr = mfspr(SPRN_PVR); 240 #endif 241 maj = (pvr >> 8) & 0xFF; 242 min = pvr & 0xFF; 243 244 seq_printf(m, "processor\t: %lu\ncpu\t\t: ", cpu_id); 245 246 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) 247 seq_puts(m, cur_cpu_spec->cpu_name); 248 else 249 seq_printf(m, "unknown (%08x)", pvr); 250 251 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 252 seq_puts(m, ", altivec supported"); 253 254 seq_putc(m, '\n'); 255 256 #ifdef CONFIG_TAU 257 if (cpu_has_feature(CPU_FTR_TAU)) { 258 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) { 259 /* more straightforward, but potentially misleading */ 260 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 261 cpu_temp(cpu_id)); 262 } else { 263 /* show the actual temp sensor range */ 264 u32 temp; 265 temp = cpu_temp_both(cpu_id); 266 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 267 temp & 0xff, temp >> 16); 268 } 269 } 270 #endif /* CONFIG_TAU */ 271 272 /* 273 * Platforms that have variable clock rates, should implement 274 * the method ppc_md.get_proc_freq() that reports the clock 275 * rate of a given cpu. The rest can use ppc_proc_freq to 276 * report the clock rate that is same across all cpus. 277 */ 278 if (ppc_md.get_proc_freq) 279 proc_freq = ppc_md.get_proc_freq(cpu_id); 280 else 281 proc_freq = ppc_proc_freq; 282 283 if (proc_freq) 284 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 285 proc_freq / 1000000, proc_freq % 1000000); 286 287 /* If we are a Freescale core do a simple check so 288 * we don't have to keep adding cases in the future */ 289 if (PVR_VER(pvr) & 0x8000) { 290 switch (PVR_VER(pvr)) { 291 case 0x8000: /* 7441/7450/7451, Voyager */ 292 case 0x8001: /* 7445/7455, Apollo 6 */ 293 case 0x8002: /* 7447/7457, Apollo 7 */ 294 case 0x8003: /* 7447A, Apollo 7 PM */ 295 case 0x8004: /* 7448, Apollo 8 */ 296 case 0x800c: /* 7410, Nitro */ 297 maj = ((pvr >> 8) & 0xF); 298 min = PVR_MIN(pvr); 299 break; 300 default: /* e500/book-e */ 301 maj = PVR_MAJ(pvr); 302 min = PVR_MIN(pvr); 303 break; 304 } 305 } else { 306 switch (PVR_VER(pvr)) { 307 case 0x1008: /* 740P/750P ?? */ 308 maj = ((pvr >> 8) & 0xFF) - 1; 309 min = pvr & 0xFF; 310 break; 311 case 0x004e: /* POWER9 bits 12-15 give chip type */ 312 case 0x0080: /* POWER10 bit 12 gives SMT8/4 */ 313 maj = (pvr >> 8) & 0x0F; 314 min = pvr & 0xFF; 315 break; 316 default: 317 maj = (pvr >> 8) & 0xFF; 318 min = pvr & 0xFF; 319 break; 320 } 321 } 322 323 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 324 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 325 326 if (IS_ENABLED(CONFIG_PPC32)) 327 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ), 328 (loops_per_jiffy / (5000 / HZ)) % 100); 329 330 seq_putc(m, '\n'); 331 332 /* If this is the last cpu, print the summary */ 333 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 334 show_cpuinfo_summary(m); 335 336 return 0; 337 } 338 339 static void *c_start(struct seq_file *m, loff_t *pos) 340 { 341 if (*pos == 0) /* just in case, cpu 0 is not the first */ 342 *pos = cpumask_first(cpu_online_mask); 343 else 344 *pos = cpumask_next(*pos - 1, cpu_online_mask); 345 if ((*pos) < nr_cpu_ids) 346 return (void *)(unsigned long)(*pos + 1); 347 return NULL; 348 } 349 350 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 351 { 352 (*pos)++; 353 return c_start(m, pos); 354 } 355 356 static void c_stop(struct seq_file *m, void *v) 357 { 358 } 359 360 const struct seq_operations cpuinfo_op = { 361 .start = c_start, 362 .next = c_next, 363 .stop = c_stop, 364 .show = show_cpuinfo, 365 }; 366 367 void __init check_for_initrd(void) 368 { 369 #ifdef CONFIG_BLK_DEV_INITRD 370 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 371 initrd_start, initrd_end); 372 373 /* If we were passed an initrd, set the ROOT_DEV properly if the values 374 * look sensible. If not, clear initrd reference. 375 */ 376 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 377 initrd_end > initrd_start) 378 ROOT_DEV = Root_RAM0; 379 else 380 initrd_start = initrd_end = 0; 381 382 if (initrd_start) 383 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 384 385 DBG(" <- check_for_initrd()\n"); 386 #endif /* CONFIG_BLK_DEV_INITRD */ 387 } 388 389 #ifdef CONFIG_SMP 390 391 int threads_per_core, threads_per_subcore, threads_shift __read_mostly; 392 cpumask_t threads_core_mask __read_mostly; 393 EXPORT_SYMBOL_GPL(threads_per_core); 394 EXPORT_SYMBOL_GPL(threads_per_subcore); 395 EXPORT_SYMBOL_GPL(threads_shift); 396 EXPORT_SYMBOL_GPL(threads_core_mask); 397 398 static void __init cpu_init_thread_core_maps(int tpc) 399 { 400 int i; 401 402 threads_per_core = tpc; 403 threads_per_subcore = tpc; 404 cpumask_clear(&threads_core_mask); 405 406 /* This implementation only supports power of 2 number of threads 407 * for simplicity and performance 408 */ 409 threads_shift = ilog2(tpc); 410 BUG_ON(tpc != (1 << threads_shift)); 411 412 for (i = 0; i < tpc; i++) 413 cpumask_set_cpu(i, &threads_core_mask); 414 415 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 416 tpc, tpc > 1 ? "s" : ""); 417 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 418 } 419 420 421 u32 *cpu_to_phys_id = NULL; 422 423 /** 424 * setup_cpu_maps - initialize the following cpu maps: 425 * cpu_possible_mask 426 * cpu_present_mask 427 * 428 * Having the possible map set up early allows us to restrict allocations 429 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 430 * 431 * We do not initialize the online map here; cpus set their own bits in 432 * cpu_online_mask as they come up. 433 * 434 * This function is valid only for Open Firmware systems. finish_device_tree 435 * must be called before using this. 436 * 437 * While we're here, we may as well set the "physical" cpu ids in the paca. 438 * 439 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 440 */ 441 void __init smp_setup_cpu_maps(void) 442 { 443 struct device_node *dn; 444 int cpu = 0; 445 int nthreads = 1; 446 447 DBG("smp_setup_cpu_maps()\n"); 448 449 cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32), 450 __alignof__(u32)); 451 if (!cpu_to_phys_id) 452 panic("%s: Failed to allocate %zu bytes align=0x%zx\n", 453 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32)); 454 455 for_each_node_by_type(dn, "cpu") { 456 const __be32 *intserv; 457 __be32 cpu_be; 458 int j, len; 459 460 DBG(" * %pOF...\n", dn); 461 462 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 463 &len); 464 if (intserv) { 465 DBG(" ibm,ppc-interrupt-server#s -> %lu threads\n", 466 (len / sizeof(int))); 467 } else { 468 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 469 intserv = of_get_property(dn, "reg", &len); 470 if (!intserv) { 471 cpu_be = cpu_to_be32(cpu); 472 /* XXX: what is this? uninitialized?? */ 473 intserv = &cpu_be; /* assume logical == phys */ 474 len = 4; 475 } 476 } 477 478 nthreads = len / sizeof(int); 479 480 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 481 bool avail; 482 483 DBG(" thread %d -> cpu %d (hard id %d)\n", 484 j, cpu, be32_to_cpu(intserv[j])); 485 486 avail = of_device_is_available(dn); 487 if (!avail) 488 avail = !of_property_match_string(dn, 489 "enable-method", "spin-table"); 490 491 set_cpu_present(cpu, avail); 492 set_cpu_possible(cpu, true); 493 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); 494 cpu++; 495 } 496 497 if (cpu >= nr_cpu_ids) { 498 of_node_put(dn); 499 break; 500 } 501 } 502 503 /* If no SMT supported, nthreads is forced to 1 */ 504 if (!cpu_has_feature(CPU_FTR_SMT)) { 505 DBG(" SMT disabled ! nthreads forced to 1\n"); 506 nthreads = 1; 507 } 508 509 #ifdef CONFIG_PPC64 510 /* 511 * On pSeries LPAR, we need to know how many cpus 512 * could possibly be added to this partition. 513 */ 514 if (firmware_has_feature(FW_FEATURE_LPAR) && 515 (dn = of_find_node_by_path("/rtas"))) { 516 int num_addr_cell, num_size_cell, maxcpus; 517 const __be32 *ireg; 518 519 num_addr_cell = of_n_addr_cells(dn); 520 num_size_cell = of_n_size_cells(dn); 521 522 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 523 524 if (!ireg) 525 goto out; 526 527 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 528 529 /* Double maxcpus for processors which have SMT capability */ 530 if (cpu_has_feature(CPU_FTR_SMT)) 531 maxcpus *= nthreads; 532 533 if (maxcpus > nr_cpu_ids) { 534 printk(KERN_WARNING 535 "Partition configured for %d cpus, " 536 "operating system maximum is %u.\n", 537 maxcpus, nr_cpu_ids); 538 maxcpus = nr_cpu_ids; 539 } else 540 printk(KERN_INFO "Partition configured for %d cpus.\n", 541 maxcpus); 542 543 for (cpu = 0; cpu < maxcpus; cpu++) 544 set_cpu_possible(cpu, true); 545 out: 546 of_node_put(dn); 547 } 548 vdso_data->processorCount = num_present_cpus(); 549 #endif /* CONFIG_PPC64 */ 550 551 /* Initialize CPU <=> thread mapping/ 552 * 553 * WARNING: We assume that the number of threads is the same for 554 * every CPU in the system. If that is not the case, then some code 555 * here will have to be reworked 556 */ 557 cpu_init_thread_core_maps(nthreads); 558 559 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 560 setup_nr_cpu_ids(); 561 562 free_unused_pacas(); 563 } 564 #endif /* CONFIG_SMP */ 565 566 #ifdef CONFIG_PCSPKR_PLATFORM 567 static __init int add_pcspkr(void) 568 { 569 struct device_node *np; 570 struct platform_device *pd; 571 int ret; 572 573 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 574 of_node_put(np); 575 if (!np) 576 return -ENODEV; 577 578 pd = platform_device_alloc("pcspkr", -1); 579 if (!pd) 580 return -ENOMEM; 581 582 ret = platform_device_add(pd); 583 if (ret) 584 platform_device_put(pd); 585 586 return ret; 587 } 588 device_initcall(add_pcspkr); 589 #endif /* CONFIG_PCSPKR_PLATFORM */ 590 591 static __init void probe_machine(void) 592 { 593 extern struct machdep_calls __machine_desc_start; 594 extern struct machdep_calls __machine_desc_end; 595 unsigned int i; 596 597 /* 598 * Iterate all ppc_md structures until we find the proper 599 * one for the current machine type 600 */ 601 DBG("Probing machine type ...\n"); 602 603 /* 604 * Check ppc_md is empty, if not we have a bug, ie, we setup an 605 * entry before probe_machine() which will be overwritten 606 */ 607 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 608 if (((void **)&ppc_md)[i]) { 609 printk(KERN_ERR "Entry %d in ppc_md non empty before" 610 " machine probe !\n", i); 611 } 612 } 613 614 for (machine_id = &__machine_desc_start; 615 machine_id < &__machine_desc_end; 616 machine_id++) { 617 DBG(" %s ...", machine_id->name); 618 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 619 if (ppc_md.probe()) { 620 DBG(" match !\n"); 621 break; 622 } 623 DBG("\n"); 624 } 625 /* What can we do if we didn't find ? */ 626 if (machine_id >= &__machine_desc_end) { 627 pr_err("No suitable machine description found !\n"); 628 for (;;); 629 } 630 631 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 632 } 633 634 /* Match a class of boards, not a specific device configuration. */ 635 int check_legacy_ioport(unsigned long base_port) 636 { 637 struct device_node *parent, *np = NULL; 638 int ret = -ENODEV; 639 640 switch(base_port) { 641 case I8042_DATA_REG: 642 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 643 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 644 if (np) { 645 parent = of_get_parent(np); 646 647 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 648 if (!of_i8042_kbd_irq) 649 of_i8042_kbd_irq = 1; 650 651 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 652 if (!of_i8042_aux_irq) 653 of_i8042_aux_irq = 12; 654 655 of_node_put(np); 656 np = parent; 657 break; 658 } 659 np = of_find_node_by_type(NULL, "8042"); 660 /* Pegasos has no device_type on its 8042 node, look for the 661 * name instead */ 662 if (!np) 663 np = of_find_node_by_name(NULL, "8042"); 664 if (np) { 665 of_i8042_kbd_irq = 1; 666 of_i8042_aux_irq = 12; 667 } 668 break; 669 case FDC_BASE: /* FDC1 */ 670 np = of_find_node_by_type(NULL, "fdc"); 671 break; 672 default: 673 /* ipmi is supposed to fail here */ 674 break; 675 } 676 if (!np) 677 return ret; 678 parent = of_get_parent(np); 679 if (parent) { 680 if (of_node_is_type(parent, "isa")) 681 ret = 0; 682 of_node_put(parent); 683 } 684 of_node_put(np); 685 return ret; 686 } 687 EXPORT_SYMBOL(check_legacy_ioport); 688 689 /* 690 * Panic notifiers setup 691 * 692 * We have 3 notifiers for powerpc, each one from a different "nature": 693 * 694 * - ppc_panic_fadump_handler() is a hypervisor notifier, which hard-disables 695 * IRQs and deal with the Firmware-Assisted dump, when it is configured; 696 * should run early in the panic path. 697 * 698 * - dump_kernel_offset() is an informative notifier, just showing the KASLR 699 * offset if we have RANDOMIZE_BASE set. 700 * 701 * - ppc_panic_platform_handler() is a low-level handler that's registered 702 * only if the platform wishes to perform final actions in the panic path, 703 * hence it should run late and might not even return. Currently, only 704 * pseries and ps3 platforms register callbacks. 705 */ 706 static int ppc_panic_fadump_handler(struct notifier_block *this, 707 unsigned long event, void *ptr) 708 { 709 /* 710 * panic does a local_irq_disable, but we really 711 * want interrupts to be hard disabled. 712 */ 713 hard_irq_disable(); 714 715 /* 716 * If firmware-assisted dump has been registered then trigger 717 * its callback and let the firmware handles everything else. 718 */ 719 crash_fadump(NULL, ptr); 720 721 return NOTIFY_DONE; 722 } 723 724 static int dump_kernel_offset(struct notifier_block *self, unsigned long v, 725 void *p) 726 { 727 pr_emerg("Kernel Offset: 0x%lx from 0x%lx\n", 728 kaslr_offset(), KERNELBASE); 729 730 return NOTIFY_DONE; 731 } 732 733 static int ppc_panic_platform_handler(struct notifier_block *this, 734 unsigned long event, void *ptr) 735 { 736 /* 737 * This handler is only registered if we have a panic callback 738 * on ppc_md, hence NULL check is not needed. 739 * Also, it may not return, so it runs really late on panic path. 740 */ 741 ppc_md.panic(ptr); 742 743 return NOTIFY_DONE; 744 } 745 746 static struct notifier_block ppc_fadump_block = { 747 .notifier_call = ppc_panic_fadump_handler, 748 .priority = INT_MAX, /* run early, to notify the firmware ASAP */ 749 }; 750 751 static struct notifier_block kernel_offset_notifier = { 752 .notifier_call = dump_kernel_offset, 753 }; 754 755 static struct notifier_block ppc_panic_block = { 756 .notifier_call = ppc_panic_platform_handler, 757 .priority = INT_MIN, /* may not return; must be done last */ 758 }; 759 760 void __init setup_panic(void) 761 { 762 /* Hard-disables IRQs + deal with FW-assisted dump (fadump) */ 763 atomic_notifier_chain_register(&panic_notifier_list, 764 &ppc_fadump_block); 765 766 if (IS_ENABLED(CONFIG_RANDOMIZE_BASE) && kaslr_offset() > 0) 767 atomic_notifier_chain_register(&panic_notifier_list, 768 &kernel_offset_notifier); 769 770 /* Low-level platform-specific routines that should run on panic */ 771 if (ppc_md.panic) 772 atomic_notifier_chain_register(&panic_notifier_list, 773 &ppc_panic_block); 774 } 775 776 #ifdef CONFIG_CHECK_CACHE_COHERENCY 777 /* 778 * For platforms that have configurable cache-coherency. This function 779 * checks that the cache coherency setting of the kernel matches the setting 780 * left by the firmware, as indicated in the device tree. Since a mismatch 781 * will eventually result in DMA failures, we print * and error and call 782 * BUG() in that case. 783 */ 784 785 #define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE)) 786 787 static int __init check_cache_coherency(void) 788 { 789 struct device_node *np; 790 const void *prop; 791 bool devtree_coherency; 792 793 np = of_find_node_by_path("/"); 794 prop = of_get_property(np, "coherency-off", NULL); 795 of_node_put(np); 796 797 devtree_coherency = prop ? false : true; 798 799 if (devtree_coherency != KERNEL_COHERENCY) { 800 printk(KERN_ERR 801 "kernel coherency:%s != device tree_coherency:%s\n", 802 KERNEL_COHERENCY ? "on" : "off", 803 devtree_coherency ? "on" : "off"); 804 BUG(); 805 } 806 807 return 0; 808 } 809 810 late_initcall(check_cache_coherency); 811 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 812 813 void ppc_printk_progress(char *s, unsigned short hex) 814 { 815 pr_info("%s\n", s); 816 } 817 818 static __init void print_system_info(void) 819 { 820 pr_info("-----------------------------------------------------\n"); 821 pr_info("phys_mem_size = 0x%llx\n", 822 (unsigned long long)memblock_phys_mem_size()); 823 824 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 825 pr_info("icache_bsize = 0x%x\n", icache_bsize); 826 827 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 828 pr_info(" possible = 0x%016lx\n", 829 (unsigned long)CPU_FTRS_POSSIBLE); 830 pr_info(" always = 0x%016lx\n", 831 (unsigned long)CPU_FTRS_ALWAYS); 832 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 833 cur_cpu_spec->cpu_user_features, 834 cur_cpu_spec->cpu_user_features2); 835 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 836 #ifdef CONFIG_PPC64 837 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 838 #ifdef CONFIG_PPC_BOOK3S 839 pr_info("vmalloc start = 0x%lx\n", KERN_VIRT_START); 840 pr_info("IO start = 0x%lx\n", KERN_IO_START); 841 pr_info("vmemmap start = 0x%lx\n", (unsigned long)vmemmap); 842 #endif 843 #endif 844 845 if (!early_radix_enabled()) 846 print_system_hash_info(); 847 848 if (PHYSICAL_START > 0) 849 pr_info("physical_start = 0x%llx\n", 850 (unsigned long long)PHYSICAL_START); 851 pr_info("-----------------------------------------------------\n"); 852 } 853 854 #ifdef CONFIG_SMP 855 static void __init smp_setup_pacas(void) 856 { 857 int cpu; 858 859 for_each_possible_cpu(cpu) { 860 if (cpu == smp_processor_id()) 861 continue; 862 allocate_paca(cpu); 863 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); 864 } 865 866 memblock_free(cpu_to_phys_id, nr_cpu_ids * sizeof(u32)); 867 cpu_to_phys_id = NULL; 868 } 869 #endif 870 871 /* 872 * Called into from start_kernel this initializes memblock, which is used 873 * to manage page allocation until mem_init is called. 874 */ 875 void __init setup_arch(char **cmdline_p) 876 { 877 kasan_init(); 878 879 *cmdline_p = boot_command_line; 880 881 /* Set a half-reasonable default so udelay does something sensible */ 882 loops_per_jiffy = 500000000 / HZ; 883 884 /* Unflatten the device-tree passed by prom_init or kexec */ 885 unflatten_device_tree(); 886 887 /* 888 * Initialize cache line/block info from device-tree (on ppc64) or 889 * just cputable (on ppc32). 890 */ 891 initialize_cache_info(); 892 893 /* Initialize RTAS if available. */ 894 rtas_initialize(); 895 896 /* Check if we have an initrd provided via the device-tree. */ 897 check_for_initrd(); 898 899 /* Probe the machine type, establish ppc_md. */ 900 probe_machine(); 901 902 /* Setup panic notifier if requested by the platform. */ 903 setup_panic(); 904 905 /* 906 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 907 * it from their respective probe() function. 908 */ 909 setup_power_save(); 910 911 /* Discover standard serial ports. */ 912 find_legacy_serial_ports(); 913 914 /* Register early console with the printk subsystem. */ 915 register_early_udbg_console(); 916 917 /* Setup the various CPU maps based on the device-tree. */ 918 smp_setup_cpu_maps(); 919 920 /* Initialize xmon. */ 921 xmon_setup(); 922 923 /* Check the SMT related command line arguments (ppc64). */ 924 check_smt_enabled(); 925 926 /* Parse memory topology */ 927 mem_topology_setup(); 928 929 /* 930 * Release secondary cpus out of their spinloops at 0x60 now that 931 * we can map physical -> logical CPU ids. 932 * 933 * Freescale Book3e parts spin in a loop provided by firmware, 934 * so smp_release_cpus() does nothing for them. 935 */ 936 #ifdef CONFIG_SMP 937 smp_setup_pacas(); 938 939 /* On BookE, setup per-core TLB data structures. */ 940 setup_tlb_core_data(); 941 #endif 942 943 /* Print various info about the machine that has been gathered so far. */ 944 print_system_info(); 945 946 klp_init_thread_info(&init_task); 947 948 setup_initial_init_mm(_stext, _etext, _edata, _end); 949 950 mm_iommu_init(&init_mm); 951 irqstack_early_init(); 952 exc_lvl_early_init(); 953 emergency_stack_init(); 954 955 mce_init(); 956 smp_release_cpus(); 957 958 initmem_init(); 959 960 /* 961 * Reserve large chunks of memory for use by CMA for KVM and hugetlb. These must 962 * be called after initmem_init(), so that pageblock_order is initialised. 963 */ 964 kvm_cma_reserve(); 965 gigantic_hugetlb_cma_reserve(); 966 967 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 968 969 if (ppc_md.setup_arch) 970 ppc_md.setup_arch(); 971 972 setup_barrier_nospec(); 973 setup_spectre_v2(); 974 975 paging_init(); 976 977 /* Initialize the MMU context management stuff. */ 978 mmu_context_init(); 979 980 /* Interrupt code needs to be 64K-aligned. */ 981 if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff) 982 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 983 (unsigned long)_stext); 984 } 985