1 /* 2 * Common boot and setup code for both 32-bit and 64-bit. 3 * Extracted from arch/powerpc/kernel/setup_64.c. 4 * 5 * Copyright (C) 2001 PPC64 Team, IBM Corp 6 * 7 * This program is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU General Public License 9 * as published by the Free Software Foundation; either version 10 * 2 of the License, or (at your option) any later version. 11 */ 12 13 #undef DEBUG 14 15 #include <linux/export.h> 16 #include <linux/string.h> 17 #include <linux/sched.h> 18 #include <linux/init.h> 19 #include <linux/kernel.h> 20 #include <linux/reboot.h> 21 #include <linux/delay.h> 22 #include <linux/initrd.h> 23 #include <linux/platform_device.h> 24 #include <linux/seq_file.h> 25 #include <linux/ioport.h> 26 #include <linux/console.h> 27 #include <linux/screen_info.h> 28 #include <linux/root_dev.h> 29 #include <linux/notifier.h> 30 #include <linux/cpu.h> 31 #include <linux/unistd.h> 32 #include <linux/serial.h> 33 #include <linux/serial_8250.h> 34 #include <linux/percpu.h> 35 #include <linux/memblock.h> 36 #include <linux/of_platform.h> 37 #include <linux/hugetlb.h> 38 #include <asm/debugfs.h> 39 #include <asm/io.h> 40 #include <asm/paca.h> 41 #include <asm/prom.h> 42 #include <asm/processor.h> 43 #include <asm/vdso_datapage.h> 44 #include <asm/pgtable.h> 45 #include <asm/smp.h> 46 #include <asm/elf.h> 47 #include <asm/machdep.h> 48 #include <asm/time.h> 49 #include <asm/cputable.h> 50 #include <asm/sections.h> 51 #include <asm/firmware.h> 52 #include <asm/btext.h> 53 #include <asm/nvram.h> 54 #include <asm/setup.h> 55 #include <asm/rtas.h> 56 #include <asm/iommu.h> 57 #include <asm/serial.h> 58 #include <asm/cache.h> 59 #include <asm/page.h> 60 #include <asm/mmu.h> 61 #include <asm/xmon.h> 62 #include <asm/cputhreads.h> 63 #include <mm/mmu_decl.h> 64 #include <asm/fadump.h> 65 #include <asm/udbg.h> 66 #include <asm/hugetlb.h> 67 #include <asm/livepatch.h> 68 #include <asm/mmu_context.h> 69 #include <asm/cpu_has_feature.h> 70 #include <asm/kasan.h> 71 72 #include "setup.h" 73 74 #ifdef DEBUG 75 #include <asm/udbg.h> 76 #define DBG(fmt...) udbg_printf(fmt) 77 #else 78 #define DBG(fmt...) 79 #endif 80 81 /* The main machine-dep calls structure 82 */ 83 struct machdep_calls ppc_md; 84 EXPORT_SYMBOL(ppc_md); 85 struct machdep_calls *machine_id; 86 EXPORT_SYMBOL(machine_id); 87 88 int boot_cpuid = -1; 89 EXPORT_SYMBOL_GPL(boot_cpuid); 90 91 /* 92 * These are used in binfmt_elf.c to put aux entries on the stack 93 * for each elf executable being started. 94 */ 95 int dcache_bsize; 96 int icache_bsize; 97 int ucache_bsize; 98 99 100 unsigned long klimit = (unsigned long) _end; 101 102 /* 103 * This still seems to be needed... -- paulus 104 */ 105 struct screen_info screen_info = { 106 .orig_x = 0, 107 .orig_y = 25, 108 .orig_video_cols = 80, 109 .orig_video_lines = 25, 110 .orig_video_isVGA = 1, 111 .orig_video_points = 16 112 }; 113 #if defined(CONFIG_FB_VGA16_MODULE) 114 EXPORT_SYMBOL(screen_info); 115 #endif 116 117 /* Variables required to store legacy IO irq routing */ 118 int of_i8042_kbd_irq; 119 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); 120 int of_i8042_aux_irq; 121 EXPORT_SYMBOL_GPL(of_i8042_aux_irq); 122 123 #ifdef __DO_IRQ_CANON 124 /* XXX should go elsewhere eventually */ 125 int ppc_do_canonicalize_irqs; 126 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 127 #endif 128 129 #ifdef CONFIG_CRASH_CORE 130 /* This keeps a track of which one is the crashing cpu. */ 131 int crashing_cpu = -1; 132 #endif 133 134 /* also used by kexec */ 135 void machine_shutdown(void) 136 { 137 /* 138 * if fadump is active, cleanup the fadump registration before we 139 * shutdown. 140 */ 141 fadump_cleanup(); 142 143 if (ppc_md.machine_shutdown) 144 ppc_md.machine_shutdown(); 145 } 146 147 static void machine_hang(void) 148 { 149 pr_emerg("System Halted, OK to turn off power\n"); 150 local_irq_disable(); 151 while (1) 152 ; 153 } 154 155 void machine_restart(char *cmd) 156 { 157 machine_shutdown(); 158 if (ppc_md.restart) 159 ppc_md.restart(cmd); 160 161 smp_send_stop(); 162 163 do_kernel_restart(cmd); 164 mdelay(1000); 165 166 machine_hang(); 167 } 168 169 void machine_power_off(void) 170 { 171 machine_shutdown(); 172 if (pm_power_off) 173 pm_power_off(); 174 175 smp_send_stop(); 176 machine_hang(); 177 } 178 /* Used by the G5 thermal driver */ 179 EXPORT_SYMBOL_GPL(machine_power_off); 180 181 void (*pm_power_off)(void); 182 EXPORT_SYMBOL_GPL(pm_power_off); 183 184 void machine_halt(void) 185 { 186 machine_shutdown(); 187 if (ppc_md.halt) 188 ppc_md.halt(); 189 190 smp_send_stop(); 191 machine_hang(); 192 } 193 194 #ifdef CONFIG_SMP 195 DEFINE_PER_CPU(unsigned int, cpu_pvr); 196 #endif 197 198 static void show_cpuinfo_summary(struct seq_file *m) 199 { 200 struct device_node *root; 201 const char *model = NULL; 202 unsigned long bogosum = 0; 203 int i; 204 205 if (IS_ENABLED(CONFIG_SMP) && IS_ENABLED(CONFIG_PPC32)) { 206 for_each_online_cpu(i) 207 bogosum += loops_per_jiffy; 208 seq_printf(m, "total bogomips\t: %lu.%02lu\n", 209 bogosum / (500000 / HZ), bogosum / (5000 / HZ) % 100); 210 } 211 seq_printf(m, "timebase\t: %lu\n", ppc_tb_freq); 212 if (ppc_md.name) 213 seq_printf(m, "platform\t: %s\n", ppc_md.name); 214 root = of_find_node_by_path("/"); 215 if (root) 216 model = of_get_property(root, "model", NULL); 217 if (model) 218 seq_printf(m, "model\t\t: %s\n", model); 219 of_node_put(root); 220 221 if (ppc_md.show_cpuinfo != NULL) 222 ppc_md.show_cpuinfo(m); 223 224 /* Display the amount of memory */ 225 if (IS_ENABLED(CONFIG_PPC32)) 226 seq_printf(m, "Memory\t\t: %d MB\n", 227 (unsigned int)(total_memory / (1024 * 1024))); 228 } 229 230 static int show_cpuinfo(struct seq_file *m, void *v) 231 { 232 unsigned long cpu_id = (unsigned long)v - 1; 233 unsigned int pvr; 234 unsigned long proc_freq; 235 unsigned short maj; 236 unsigned short min; 237 238 #ifdef CONFIG_SMP 239 pvr = per_cpu(cpu_pvr, cpu_id); 240 #else 241 pvr = mfspr(SPRN_PVR); 242 #endif 243 maj = (pvr >> 8) & 0xFF; 244 min = pvr & 0xFF; 245 246 seq_printf(m, "processor\t: %lu\n", cpu_id); 247 seq_printf(m, "cpu\t\t: "); 248 249 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) 250 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 251 else 252 seq_printf(m, "unknown (%08x)", pvr); 253 254 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 255 seq_printf(m, ", altivec supported"); 256 257 seq_printf(m, "\n"); 258 259 #ifdef CONFIG_TAU 260 if (cpu_has_feature(CPU_FTR_TAU)) { 261 if (IS_ENABLED(CONFIG_TAU_AVERAGE)) { 262 /* more straightforward, but potentially misleading */ 263 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 264 cpu_temp(cpu_id)); 265 } else { 266 /* show the actual temp sensor range */ 267 u32 temp; 268 temp = cpu_temp_both(cpu_id); 269 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 270 temp & 0xff, temp >> 16); 271 } 272 } 273 #endif /* CONFIG_TAU */ 274 275 /* 276 * Platforms that have variable clock rates, should implement 277 * the method ppc_md.get_proc_freq() that reports the clock 278 * rate of a given cpu. The rest can use ppc_proc_freq to 279 * report the clock rate that is same across all cpus. 280 */ 281 if (ppc_md.get_proc_freq) 282 proc_freq = ppc_md.get_proc_freq(cpu_id); 283 else 284 proc_freq = ppc_proc_freq; 285 286 if (proc_freq) 287 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 288 proc_freq / 1000000, proc_freq % 1000000); 289 290 if (ppc_md.show_percpuinfo != NULL) 291 ppc_md.show_percpuinfo(m, cpu_id); 292 293 /* If we are a Freescale core do a simple check so 294 * we dont have to keep adding cases in the future */ 295 if (PVR_VER(pvr) & 0x8000) { 296 switch (PVR_VER(pvr)) { 297 case 0x8000: /* 7441/7450/7451, Voyager */ 298 case 0x8001: /* 7445/7455, Apollo 6 */ 299 case 0x8002: /* 7447/7457, Apollo 7 */ 300 case 0x8003: /* 7447A, Apollo 7 PM */ 301 case 0x8004: /* 7448, Apollo 8 */ 302 case 0x800c: /* 7410, Nitro */ 303 maj = ((pvr >> 8) & 0xF); 304 min = PVR_MIN(pvr); 305 break; 306 default: /* e500/book-e */ 307 maj = PVR_MAJ(pvr); 308 min = PVR_MIN(pvr); 309 break; 310 } 311 } else { 312 switch (PVR_VER(pvr)) { 313 case 0x0020: /* 403 family */ 314 maj = PVR_MAJ(pvr) + 1; 315 min = PVR_MIN(pvr); 316 break; 317 case 0x1008: /* 740P/750P ?? */ 318 maj = ((pvr >> 8) & 0xFF) - 1; 319 min = pvr & 0xFF; 320 break; 321 case 0x004e: /* POWER9 bits 12-15 give chip type */ 322 maj = (pvr >> 8) & 0x0F; 323 min = pvr & 0xFF; 324 break; 325 default: 326 maj = (pvr >> 8) & 0xFF; 327 min = pvr & 0xFF; 328 break; 329 } 330 } 331 332 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 333 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 334 335 if (IS_ENABLED(CONFIG_PPC32)) 336 seq_printf(m, "bogomips\t: %lu.%02lu\n", loops_per_jiffy / (500000 / HZ), 337 (loops_per_jiffy / (5000 / HZ)) % 100); 338 339 seq_printf(m, "\n"); 340 341 /* If this is the last cpu, print the summary */ 342 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 343 show_cpuinfo_summary(m); 344 345 return 0; 346 } 347 348 static void *c_start(struct seq_file *m, loff_t *pos) 349 { 350 if (*pos == 0) /* just in case, cpu 0 is not the first */ 351 *pos = cpumask_first(cpu_online_mask); 352 else 353 *pos = cpumask_next(*pos - 1, cpu_online_mask); 354 if ((*pos) < nr_cpu_ids) 355 return (void *)(unsigned long)(*pos + 1); 356 return NULL; 357 } 358 359 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 360 { 361 (*pos)++; 362 return c_start(m, pos); 363 } 364 365 static void c_stop(struct seq_file *m, void *v) 366 { 367 } 368 369 const struct seq_operations cpuinfo_op = { 370 .start = c_start, 371 .next = c_next, 372 .stop = c_stop, 373 .show = show_cpuinfo, 374 }; 375 376 void __init check_for_initrd(void) 377 { 378 #ifdef CONFIG_BLK_DEV_INITRD 379 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 380 initrd_start, initrd_end); 381 382 /* If we were passed an initrd, set the ROOT_DEV properly if the values 383 * look sensible. If not, clear initrd reference. 384 */ 385 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 386 initrd_end > initrd_start) 387 ROOT_DEV = Root_RAM0; 388 else 389 initrd_start = initrd_end = 0; 390 391 if (initrd_start) 392 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 393 394 DBG(" <- check_for_initrd()\n"); 395 #endif /* CONFIG_BLK_DEV_INITRD */ 396 } 397 398 #ifdef CONFIG_SMP 399 400 int threads_per_core, threads_per_subcore, threads_shift __read_mostly; 401 cpumask_t threads_core_mask __read_mostly; 402 EXPORT_SYMBOL_GPL(threads_per_core); 403 EXPORT_SYMBOL_GPL(threads_per_subcore); 404 EXPORT_SYMBOL_GPL(threads_shift); 405 EXPORT_SYMBOL_GPL(threads_core_mask); 406 407 static void __init cpu_init_thread_core_maps(int tpc) 408 { 409 int i; 410 411 threads_per_core = tpc; 412 threads_per_subcore = tpc; 413 cpumask_clear(&threads_core_mask); 414 415 /* This implementation only supports power of 2 number of threads 416 * for simplicity and performance 417 */ 418 threads_shift = ilog2(tpc); 419 BUG_ON(tpc != (1 << threads_shift)); 420 421 for (i = 0; i < tpc; i++) 422 cpumask_set_cpu(i, &threads_core_mask); 423 424 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 425 tpc, tpc > 1 ? "s" : ""); 426 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 427 } 428 429 430 u32 *cpu_to_phys_id = NULL; 431 432 /** 433 * setup_cpu_maps - initialize the following cpu maps: 434 * cpu_possible_mask 435 * cpu_present_mask 436 * 437 * Having the possible map set up early allows us to restrict allocations 438 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 439 * 440 * We do not initialize the online map here; cpus set their own bits in 441 * cpu_online_mask as they come up. 442 * 443 * This function is valid only for Open Firmware systems. finish_device_tree 444 * must be called before using this. 445 * 446 * While we're here, we may as well set the "physical" cpu ids in the paca. 447 * 448 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 449 */ 450 void __init smp_setup_cpu_maps(void) 451 { 452 struct device_node *dn; 453 int cpu = 0; 454 int nthreads = 1; 455 456 DBG("smp_setup_cpu_maps()\n"); 457 458 cpu_to_phys_id = memblock_alloc(nr_cpu_ids * sizeof(u32), 459 __alignof__(u32)); 460 if (!cpu_to_phys_id) 461 panic("%s: Failed to allocate %zu bytes align=0x%zx\n", 462 __func__, nr_cpu_ids * sizeof(u32), __alignof__(u32)); 463 464 for_each_node_by_type(dn, "cpu") { 465 const __be32 *intserv; 466 __be32 cpu_be; 467 int j, len; 468 469 DBG(" * %pOF...\n", dn); 470 471 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 472 &len); 473 if (intserv) { 474 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 475 nthreads); 476 } else { 477 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 478 intserv = of_get_property(dn, "reg", &len); 479 if (!intserv) { 480 cpu_be = cpu_to_be32(cpu); 481 /* XXX: what is this? uninitialized?? */ 482 intserv = &cpu_be; /* assume logical == phys */ 483 len = 4; 484 } 485 } 486 487 nthreads = len / sizeof(int); 488 489 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 490 bool avail; 491 492 DBG(" thread %d -> cpu %d (hard id %d)\n", 493 j, cpu, be32_to_cpu(intserv[j])); 494 495 avail = of_device_is_available(dn); 496 if (!avail) 497 avail = !of_property_match_string(dn, 498 "enable-method", "spin-table"); 499 500 set_cpu_present(cpu, avail); 501 set_cpu_possible(cpu, true); 502 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); 503 cpu++; 504 } 505 506 if (cpu >= nr_cpu_ids) { 507 of_node_put(dn); 508 break; 509 } 510 } 511 512 /* If no SMT supported, nthreads is forced to 1 */ 513 if (!cpu_has_feature(CPU_FTR_SMT)) { 514 DBG(" SMT disabled ! nthreads forced to 1\n"); 515 nthreads = 1; 516 } 517 518 #ifdef CONFIG_PPC64 519 /* 520 * On pSeries LPAR, we need to know how many cpus 521 * could possibly be added to this partition. 522 */ 523 if (firmware_has_feature(FW_FEATURE_LPAR) && 524 (dn = of_find_node_by_path("/rtas"))) { 525 int num_addr_cell, num_size_cell, maxcpus; 526 const __be32 *ireg; 527 528 num_addr_cell = of_n_addr_cells(dn); 529 num_size_cell = of_n_size_cells(dn); 530 531 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 532 533 if (!ireg) 534 goto out; 535 536 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 537 538 /* Double maxcpus for processors which have SMT capability */ 539 if (cpu_has_feature(CPU_FTR_SMT)) 540 maxcpus *= nthreads; 541 542 if (maxcpus > nr_cpu_ids) { 543 printk(KERN_WARNING 544 "Partition configured for %d cpus, " 545 "operating system maximum is %u.\n", 546 maxcpus, nr_cpu_ids); 547 maxcpus = nr_cpu_ids; 548 } else 549 printk(KERN_INFO "Partition configured for %d cpus.\n", 550 maxcpus); 551 552 for (cpu = 0; cpu < maxcpus; cpu++) 553 set_cpu_possible(cpu, true); 554 out: 555 of_node_put(dn); 556 } 557 vdso_data->processorCount = num_present_cpus(); 558 #endif /* CONFIG_PPC64 */ 559 560 /* Initialize CPU <=> thread mapping/ 561 * 562 * WARNING: We assume that the number of threads is the same for 563 * every CPU in the system. If that is not the case, then some code 564 * here will have to be reworked 565 */ 566 cpu_init_thread_core_maps(nthreads); 567 568 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 569 setup_nr_cpu_ids(); 570 571 free_unused_pacas(); 572 } 573 #endif /* CONFIG_SMP */ 574 575 #ifdef CONFIG_PCSPKR_PLATFORM 576 static __init int add_pcspkr(void) 577 { 578 struct device_node *np; 579 struct platform_device *pd; 580 int ret; 581 582 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 583 of_node_put(np); 584 if (!np) 585 return -ENODEV; 586 587 pd = platform_device_alloc("pcspkr", -1); 588 if (!pd) 589 return -ENOMEM; 590 591 ret = platform_device_add(pd); 592 if (ret) 593 platform_device_put(pd); 594 595 return ret; 596 } 597 device_initcall(add_pcspkr); 598 #endif /* CONFIG_PCSPKR_PLATFORM */ 599 600 void probe_machine(void) 601 { 602 extern struct machdep_calls __machine_desc_start; 603 extern struct machdep_calls __machine_desc_end; 604 unsigned int i; 605 606 /* 607 * Iterate all ppc_md structures until we find the proper 608 * one for the current machine type 609 */ 610 DBG("Probing machine type ...\n"); 611 612 /* 613 * Check ppc_md is empty, if not we have a bug, ie, we setup an 614 * entry before probe_machine() which will be overwritten 615 */ 616 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 617 if (((void **)&ppc_md)[i]) { 618 printk(KERN_ERR "Entry %d in ppc_md non empty before" 619 " machine probe !\n", i); 620 } 621 } 622 623 for (machine_id = &__machine_desc_start; 624 machine_id < &__machine_desc_end; 625 machine_id++) { 626 DBG(" %s ...", machine_id->name); 627 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 628 if (ppc_md.probe()) { 629 DBG(" match !\n"); 630 break; 631 } 632 DBG("\n"); 633 } 634 /* What can we do if we didn't find ? */ 635 if (machine_id >= &__machine_desc_end) { 636 pr_err("No suitable machine description found !\n"); 637 for (;;); 638 } 639 640 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 641 } 642 643 /* Match a class of boards, not a specific device configuration. */ 644 int check_legacy_ioport(unsigned long base_port) 645 { 646 struct device_node *parent, *np = NULL; 647 int ret = -ENODEV; 648 649 switch(base_port) { 650 case I8042_DATA_REG: 651 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 652 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 653 if (np) { 654 parent = of_get_parent(np); 655 656 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 657 if (!of_i8042_kbd_irq) 658 of_i8042_kbd_irq = 1; 659 660 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 661 if (!of_i8042_aux_irq) 662 of_i8042_aux_irq = 12; 663 664 of_node_put(np); 665 np = parent; 666 break; 667 } 668 np = of_find_node_by_type(NULL, "8042"); 669 /* Pegasos has no device_type on its 8042 node, look for the 670 * name instead */ 671 if (!np) 672 np = of_find_node_by_name(NULL, "8042"); 673 if (np) { 674 of_i8042_kbd_irq = 1; 675 of_i8042_aux_irq = 12; 676 } 677 break; 678 case FDC_BASE: /* FDC1 */ 679 np = of_find_node_by_type(NULL, "fdc"); 680 break; 681 default: 682 /* ipmi is supposed to fail here */ 683 break; 684 } 685 if (!np) 686 return ret; 687 parent = of_get_parent(np); 688 if (parent) { 689 if (of_node_is_type(parent, "isa")) 690 ret = 0; 691 of_node_put(parent); 692 } 693 of_node_put(np); 694 return ret; 695 } 696 EXPORT_SYMBOL(check_legacy_ioport); 697 698 static int ppc_panic_event(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 * firmware-assisted dump and let firmware handle everything else. 710 */ 711 crash_fadump(NULL, ptr); 712 if (ppc_md.panic) 713 ppc_md.panic(ptr); /* May not return */ 714 return NOTIFY_DONE; 715 } 716 717 static struct notifier_block ppc_panic_block = { 718 .notifier_call = ppc_panic_event, 719 .priority = INT_MIN /* may not return; must be done last */ 720 }; 721 722 void __init setup_panic(void) 723 { 724 /* PPC64 always does a hard irq disable in its panic handler */ 725 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic) 726 return; 727 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 728 } 729 730 #ifdef CONFIG_CHECK_CACHE_COHERENCY 731 /* 732 * For platforms that have configurable cache-coherency. This function 733 * checks that the cache coherency setting of the kernel matches the setting 734 * left by the firmware, as indicated in the device tree. Since a mismatch 735 * will eventually result in DMA failures, we print * and error and call 736 * BUG() in that case. 737 */ 738 739 #define KERNEL_COHERENCY (!IS_ENABLED(CONFIG_NOT_COHERENT_CACHE)) 740 741 static int __init check_cache_coherency(void) 742 { 743 struct device_node *np; 744 const void *prop; 745 bool devtree_coherency; 746 747 np = of_find_node_by_path("/"); 748 prop = of_get_property(np, "coherency-off", NULL); 749 of_node_put(np); 750 751 devtree_coherency = prop ? false : true; 752 753 if (devtree_coherency != KERNEL_COHERENCY) { 754 printk(KERN_ERR 755 "kernel coherency:%s != device tree_coherency:%s\n", 756 KERNEL_COHERENCY ? "on" : "off", 757 devtree_coherency ? "on" : "off"); 758 BUG(); 759 } 760 761 return 0; 762 } 763 764 late_initcall(check_cache_coherency); 765 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 766 767 #ifdef CONFIG_DEBUG_FS 768 struct dentry *powerpc_debugfs_root; 769 EXPORT_SYMBOL(powerpc_debugfs_root); 770 771 static int powerpc_debugfs_init(void) 772 { 773 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 774 775 return powerpc_debugfs_root == NULL; 776 } 777 arch_initcall(powerpc_debugfs_init); 778 #endif 779 780 void ppc_printk_progress(char *s, unsigned short hex) 781 { 782 pr_info("%s\n", s); 783 } 784 785 void arch_setup_pdev_archdata(struct platform_device *pdev) 786 { 787 pdev->archdata.dma_mask = DMA_BIT_MASK(32); 788 pdev->dev.dma_mask = &pdev->archdata.dma_mask; 789 } 790 791 static __init void print_system_info(void) 792 { 793 pr_info("-----------------------------------------------------\n"); 794 pr_info("phys_mem_size = 0x%llx\n", 795 (unsigned long long)memblock_phys_mem_size()); 796 797 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 798 pr_info("icache_bsize = 0x%x\n", icache_bsize); 799 if (ucache_bsize != 0) 800 pr_info("ucache_bsize = 0x%x\n", ucache_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 #endif 814 815 print_system_hash_info(); 816 817 if (PHYSICAL_START > 0) 818 pr_info("physical_start = 0x%llx\n", 819 (unsigned long long)PHYSICAL_START); 820 pr_info("-----------------------------------------------------\n"); 821 } 822 823 #ifdef CONFIG_SMP 824 static void smp_setup_pacas(void) 825 { 826 int cpu; 827 828 for_each_possible_cpu(cpu) { 829 if (cpu == smp_processor_id()) 830 continue; 831 allocate_paca(cpu); 832 set_hard_smp_processor_id(cpu, cpu_to_phys_id[cpu]); 833 } 834 835 memblock_free(__pa(cpu_to_phys_id), nr_cpu_ids * sizeof(u32)); 836 cpu_to_phys_id = NULL; 837 } 838 #endif 839 840 /* 841 * Called into from start_kernel this initializes memblock, which is used 842 * to manage page allocation until mem_init is called. 843 */ 844 void __init setup_arch(char **cmdline_p) 845 { 846 kasan_init(); 847 848 *cmdline_p = boot_command_line; 849 850 /* Set a half-reasonable default so udelay does something sensible */ 851 loops_per_jiffy = 500000000 / HZ; 852 853 /* Unflatten the device-tree passed by prom_init or kexec */ 854 unflatten_device_tree(); 855 856 /* 857 * Initialize cache line/block info from device-tree (on ppc64) or 858 * just cputable (on ppc32). 859 */ 860 initialize_cache_info(); 861 862 /* Initialize RTAS if available. */ 863 rtas_initialize(); 864 865 /* Check if we have an initrd provided via the device-tree. */ 866 check_for_initrd(); 867 868 /* Probe the machine type, establish ppc_md. */ 869 probe_machine(); 870 871 /* Setup panic notifier if requested by the platform. */ 872 setup_panic(); 873 874 /* 875 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 876 * it from their respective probe() function. 877 */ 878 setup_power_save(); 879 880 /* Discover standard serial ports. */ 881 find_legacy_serial_ports(); 882 883 /* Register early console with the printk subsystem. */ 884 register_early_udbg_console(); 885 886 /* Setup the various CPU maps based on the device-tree. */ 887 smp_setup_cpu_maps(); 888 889 /* Initialize xmon. */ 890 xmon_setup(); 891 892 /* Check the SMT related command line arguments (ppc64). */ 893 check_smt_enabled(); 894 895 /* Parse memory topology */ 896 mem_topology_setup(); 897 898 /* 899 * Release secondary cpus out of their spinloops at 0x60 now that 900 * we can map physical -> logical CPU ids. 901 * 902 * Freescale Book3e parts spin in a loop provided by firmware, 903 * so smp_release_cpus() does nothing for them. 904 */ 905 #ifdef CONFIG_SMP 906 smp_setup_pacas(); 907 908 /* On BookE, setup per-core TLB data structures. */ 909 setup_tlb_core_data(); 910 911 smp_release_cpus(); 912 #endif 913 914 /* Print various info about the machine that has been gathered so far. */ 915 print_system_info(); 916 917 /* Reserve large chunks of memory for use by CMA for KVM. */ 918 kvm_cma_reserve(); 919 920 klp_init_thread_info(&init_task); 921 922 init_mm.start_code = (unsigned long)_stext; 923 init_mm.end_code = (unsigned long) _etext; 924 init_mm.end_data = (unsigned long) _edata; 925 init_mm.brk = klimit; 926 927 mm_iommu_init(&init_mm); 928 irqstack_early_init(); 929 exc_lvl_early_init(); 930 emergency_stack_init(); 931 932 initmem_init(); 933 934 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 935 936 if (IS_ENABLED(CONFIG_DUMMY_CONSOLE)) 937 conswitchp = &dummy_con; 938 939 if (ppc_md.setup_arch) 940 ppc_md.setup_arch(); 941 942 setup_barrier_nospec(); 943 setup_spectre_v2(); 944 945 paging_init(); 946 947 /* Initialize the MMU context management stuff. */ 948 mmu_context_init(); 949 950 /* Interrupt code needs to be 64K-aligned. */ 951 if (IS_ENABLED(CONFIG_PPC64) && (unsigned long)_stext & 0xffff) 952 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 953 (unsigned long)_stext); 954 } 955