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