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 71 #include "setup.h" 72 73 #ifdef DEBUG 74 #include <asm/udbg.h> 75 #define DBG(fmt...) udbg_printf(fmt) 76 #else 77 #define DBG(fmt...) 78 #endif 79 80 /* The main machine-dep calls structure 81 */ 82 struct machdep_calls ppc_md; 83 EXPORT_SYMBOL(ppc_md); 84 struct machdep_calls *machine_id; 85 EXPORT_SYMBOL(machine_id); 86 87 int boot_cpuid = -1; 88 EXPORT_SYMBOL_GPL(boot_cpuid); 89 90 /* 91 * These are used in binfmt_elf.c to put aux entries on the stack 92 * for each elf executable being started. 93 */ 94 int dcache_bsize; 95 int icache_bsize; 96 int ucache_bsize; 97 98 99 unsigned long klimit = (unsigned long) _end; 100 101 /* 102 * This still seems to be needed... -- paulus 103 */ 104 struct screen_info screen_info = { 105 .orig_x = 0, 106 .orig_y = 25, 107 .orig_video_cols = 80, 108 .orig_video_lines = 25, 109 .orig_video_isVGA = 1, 110 .orig_video_points = 16 111 }; 112 #if defined(CONFIG_FB_VGA16_MODULE) 113 EXPORT_SYMBOL(screen_info); 114 #endif 115 116 /* Variables required to store legacy IO irq routing */ 117 int of_i8042_kbd_irq; 118 EXPORT_SYMBOL_GPL(of_i8042_kbd_irq); 119 int of_i8042_aux_irq; 120 EXPORT_SYMBOL_GPL(of_i8042_aux_irq); 121 122 #ifdef __DO_IRQ_CANON 123 /* XXX should go elsewhere eventually */ 124 int ppc_do_canonicalize_irqs; 125 EXPORT_SYMBOL(ppc_do_canonicalize_irqs); 126 #endif 127 128 #ifdef CONFIG_CRASH_CORE 129 /* This keeps a track of which one is the crashing cpu. */ 130 int crashing_cpu = -1; 131 #endif 132 133 /* also used by kexec */ 134 void machine_shutdown(void) 135 { 136 #ifdef CONFIG_FA_DUMP 137 /* 138 * if fadump is active, cleanup the fadump registration before we 139 * shutdown. 140 */ 141 fadump_cleanup(); 142 #endif 143 144 if (ppc_md.machine_shutdown) 145 ppc_md.machine_shutdown(); 146 } 147 148 static void machine_hang(void) 149 { 150 pr_emerg("System Halted, OK to turn off power\n"); 151 local_irq_disable(); 152 while (1) 153 ; 154 } 155 156 void machine_restart(char *cmd) 157 { 158 machine_shutdown(); 159 if (ppc_md.restart) 160 ppc_md.restart(cmd); 161 162 smp_send_stop(); 163 164 do_kernel_restart(cmd); 165 mdelay(1000); 166 167 machine_hang(); 168 } 169 170 void machine_power_off(void) 171 { 172 machine_shutdown(); 173 if (pm_power_off) 174 pm_power_off(); 175 176 smp_send_stop(); 177 machine_hang(); 178 } 179 /* Used by the G5 thermal driver */ 180 EXPORT_SYMBOL_GPL(machine_power_off); 181 182 void (*pm_power_off)(void); 183 EXPORT_SYMBOL_GPL(pm_power_off); 184 185 void machine_halt(void) 186 { 187 machine_shutdown(); 188 if (ppc_md.halt) 189 ppc_md.halt(); 190 191 smp_send_stop(); 192 machine_hang(); 193 } 194 195 #ifdef CONFIG_SMP 196 DEFINE_PER_CPU(unsigned int, cpu_pvr); 197 #endif 198 199 static void show_cpuinfo_summary(struct seq_file *m) 200 { 201 struct device_node *root; 202 const char *model = NULL; 203 #if defined(CONFIG_SMP) && defined(CONFIG_PPC32) 204 unsigned long bogosum = 0; 205 int i; 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 #endif /* CONFIG_SMP && CONFIG_PPC32 */ 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 #ifdef CONFIG_PPC32 225 /* Display the amount of memory */ 226 seq_printf(m, "Memory\t\t: %d MB\n", 227 (unsigned int)(total_memory / (1024 * 1024))); 228 #endif 229 } 230 231 static int show_cpuinfo(struct seq_file *m, void *v) 232 { 233 unsigned long cpu_id = (unsigned long)v - 1; 234 unsigned int pvr; 235 unsigned long proc_freq; 236 unsigned short maj; 237 unsigned short min; 238 239 #ifdef CONFIG_SMP 240 pvr = per_cpu(cpu_pvr, cpu_id); 241 #else 242 pvr = mfspr(SPRN_PVR); 243 #endif 244 maj = (pvr >> 8) & 0xFF; 245 min = pvr & 0xFF; 246 247 seq_printf(m, "processor\t: %lu\n", cpu_id); 248 seq_printf(m, "cpu\t\t: "); 249 250 if (cur_cpu_spec->pvr_mask && cur_cpu_spec->cpu_name) 251 seq_printf(m, "%s", cur_cpu_spec->cpu_name); 252 else 253 seq_printf(m, "unknown (%08x)", pvr); 254 255 #ifdef CONFIG_ALTIVEC 256 if (cpu_has_feature(CPU_FTR_ALTIVEC)) 257 seq_printf(m, ", altivec supported"); 258 #endif /* CONFIG_ALTIVEC */ 259 260 seq_printf(m, "\n"); 261 262 #ifdef CONFIG_TAU 263 if (cur_cpu_spec->cpu_features & CPU_FTR_TAU) { 264 #ifdef CONFIG_TAU_AVERAGE 265 /* more straightforward, but potentially misleading */ 266 seq_printf(m, "temperature \t: %u C (uncalibrated)\n", 267 cpu_temp(cpu_id)); 268 #else 269 /* show the actual temp sensor range */ 270 u32 temp; 271 temp = cpu_temp_both(cpu_id); 272 seq_printf(m, "temperature \t: %u-%u C (uncalibrated)\n", 273 temp & 0xff, temp >> 16); 274 #endif 275 } 276 #endif /* CONFIG_TAU */ 277 278 /* 279 * Platforms that have variable clock rates, should implement 280 * the method ppc_md.get_proc_freq() that reports the clock 281 * rate of a given cpu. The rest can use ppc_proc_freq to 282 * report the clock rate that is same across all cpus. 283 */ 284 if (ppc_md.get_proc_freq) 285 proc_freq = ppc_md.get_proc_freq(cpu_id); 286 else 287 proc_freq = ppc_proc_freq; 288 289 if (proc_freq) 290 seq_printf(m, "clock\t\t: %lu.%06luMHz\n", 291 proc_freq / 1000000, proc_freq % 1000000); 292 293 if (ppc_md.show_percpuinfo != NULL) 294 ppc_md.show_percpuinfo(m, cpu_id); 295 296 /* If we are a Freescale core do a simple check so 297 * we dont have to keep adding cases in the future */ 298 if (PVR_VER(pvr) & 0x8000) { 299 switch (PVR_VER(pvr)) { 300 case 0x8000: /* 7441/7450/7451, Voyager */ 301 case 0x8001: /* 7445/7455, Apollo 6 */ 302 case 0x8002: /* 7447/7457, Apollo 7 */ 303 case 0x8003: /* 7447A, Apollo 7 PM */ 304 case 0x8004: /* 7448, Apollo 8 */ 305 case 0x800c: /* 7410, Nitro */ 306 maj = ((pvr >> 8) & 0xF); 307 min = PVR_MIN(pvr); 308 break; 309 default: /* e500/book-e */ 310 maj = PVR_MAJ(pvr); 311 min = PVR_MIN(pvr); 312 break; 313 } 314 } else { 315 switch (PVR_VER(pvr)) { 316 case 0x0020: /* 403 family */ 317 maj = PVR_MAJ(pvr) + 1; 318 min = PVR_MIN(pvr); 319 break; 320 case 0x1008: /* 740P/750P ?? */ 321 maj = ((pvr >> 8) & 0xFF) - 1; 322 min = pvr & 0xFF; 323 break; 324 case 0x004e: /* POWER9 bits 12-15 give chip type */ 325 maj = (pvr >> 8) & 0x0F; 326 min = pvr & 0xFF; 327 break; 328 default: 329 maj = (pvr >> 8) & 0xFF; 330 min = pvr & 0xFF; 331 break; 332 } 333 } 334 335 seq_printf(m, "revision\t: %hd.%hd (pvr %04x %04x)\n", 336 maj, min, PVR_VER(pvr), PVR_REV(pvr)); 337 338 #ifdef CONFIG_PPC32 339 seq_printf(m, "bogomips\t: %lu.%02lu\n", 340 loops_per_jiffy / (500000/HZ), 341 (loops_per_jiffy / (5000/HZ)) % 100); 342 #endif 343 seq_printf(m, "\n"); 344 345 /* If this is the last cpu, print the summary */ 346 if (cpumask_next(cpu_id, cpu_online_mask) >= nr_cpu_ids) 347 show_cpuinfo_summary(m); 348 349 return 0; 350 } 351 352 static void *c_start(struct seq_file *m, loff_t *pos) 353 { 354 if (*pos == 0) /* just in case, cpu 0 is not the first */ 355 *pos = cpumask_first(cpu_online_mask); 356 else 357 *pos = cpumask_next(*pos - 1, cpu_online_mask); 358 if ((*pos) < nr_cpu_ids) 359 return (void *)(unsigned long)(*pos + 1); 360 return NULL; 361 } 362 363 static void *c_next(struct seq_file *m, void *v, loff_t *pos) 364 { 365 (*pos)++; 366 return c_start(m, pos); 367 } 368 369 static void c_stop(struct seq_file *m, void *v) 370 { 371 } 372 373 const struct seq_operations cpuinfo_op = { 374 .start = c_start, 375 .next = c_next, 376 .stop = c_stop, 377 .show = show_cpuinfo, 378 }; 379 380 void __init check_for_initrd(void) 381 { 382 #ifdef CONFIG_BLK_DEV_INITRD 383 DBG(" -> check_for_initrd() initrd_start=0x%lx initrd_end=0x%lx\n", 384 initrd_start, initrd_end); 385 386 /* If we were passed an initrd, set the ROOT_DEV properly if the values 387 * look sensible. If not, clear initrd reference. 388 */ 389 if (is_kernel_addr(initrd_start) && is_kernel_addr(initrd_end) && 390 initrd_end > initrd_start) 391 ROOT_DEV = Root_RAM0; 392 else 393 initrd_start = initrd_end = 0; 394 395 if (initrd_start) 396 pr_info("Found initrd at 0x%lx:0x%lx\n", initrd_start, initrd_end); 397 398 DBG(" <- check_for_initrd()\n"); 399 #endif /* CONFIG_BLK_DEV_INITRD */ 400 } 401 402 #ifdef CONFIG_SMP 403 404 int threads_per_core, threads_per_subcore, threads_shift; 405 cpumask_t threads_core_mask; 406 EXPORT_SYMBOL_GPL(threads_per_core); 407 EXPORT_SYMBOL_GPL(threads_per_subcore); 408 EXPORT_SYMBOL_GPL(threads_shift); 409 EXPORT_SYMBOL_GPL(threads_core_mask); 410 411 static void __init cpu_init_thread_core_maps(int tpc) 412 { 413 int i; 414 415 threads_per_core = tpc; 416 threads_per_subcore = tpc; 417 cpumask_clear(&threads_core_mask); 418 419 /* This implementation only supports power of 2 number of threads 420 * for simplicity and performance 421 */ 422 threads_shift = ilog2(tpc); 423 BUG_ON(tpc != (1 << threads_shift)); 424 425 for (i = 0; i < tpc; i++) 426 cpumask_set_cpu(i, &threads_core_mask); 427 428 printk(KERN_INFO "CPU maps initialized for %d thread%s per core\n", 429 tpc, tpc > 1 ? "s" : ""); 430 printk(KERN_DEBUG " (thread shift is %d)\n", threads_shift); 431 } 432 433 434 u32 *cpu_to_phys_id = NULL; 435 436 /** 437 * setup_cpu_maps - initialize the following cpu maps: 438 * cpu_possible_mask 439 * cpu_present_mask 440 * 441 * Having the possible map set up early allows us to restrict allocations 442 * of things like irqstacks to nr_cpu_ids rather than NR_CPUS. 443 * 444 * We do not initialize the online map here; cpus set their own bits in 445 * cpu_online_mask as they come up. 446 * 447 * This function is valid only for Open Firmware systems. finish_device_tree 448 * must be called before using this. 449 * 450 * While we're here, we may as well set the "physical" cpu ids in the paca. 451 * 452 * NOTE: This must match the parsing done in early_init_dt_scan_cpus. 453 */ 454 void __init smp_setup_cpu_maps(void) 455 { 456 struct device_node *dn; 457 int cpu = 0; 458 int nthreads = 1; 459 460 DBG("smp_setup_cpu_maps()\n"); 461 462 cpu_to_phys_id = __va(memblock_phys_alloc(nr_cpu_ids * sizeof(u32), __alignof__(u32))); 463 memset(cpu_to_phys_id, 0, nr_cpu_ids * sizeof(u32)); 464 465 for_each_node_by_type(dn, "cpu") { 466 const __be32 *intserv; 467 __be32 cpu_be; 468 int j, len; 469 470 DBG(" * %pOF...\n", dn); 471 472 intserv = of_get_property(dn, "ibm,ppc-interrupt-server#s", 473 &len); 474 if (intserv) { 475 DBG(" ibm,ppc-interrupt-server#s -> %d threads\n", 476 nthreads); 477 } else { 478 DBG(" no ibm,ppc-interrupt-server#s -> 1 thread\n"); 479 intserv = of_get_property(dn, "reg", &len); 480 if (!intserv) { 481 cpu_be = cpu_to_be32(cpu); 482 /* XXX: what is this? uninitialized?? */ 483 intserv = &cpu_be; /* assume logical == phys */ 484 len = 4; 485 } 486 } 487 488 nthreads = len / sizeof(int); 489 490 for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { 491 bool avail; 492 493 DBG(" thread %d -> cpu %d (hard id %d)\n", 494 j, cpu, be32_to_cpu(intserv[j])); 495 496 avail = of_device_is_available(dn); 497 if (!avail) 498 avail = !of_property_match_string(dn, 499 "enable-method", "spin-table"); 500 501 set_cpu_present(cpu, avail); 502 set_cpu_possible(cpu, true); 503 cpu_to_phys_id[cpu] = be32_to_cpu(intserv[j]); 504 cpu++; 505 } 506 507 if (cpu >= nr_cpu_ids) { 508 of_node_put(dn); 509 break; 510 } 511 } 512 513 /* If no SMT supported, nthreads is forced to 1 */ 514 if (!cpu_has_feature(CPU_FTR_SMT)) { 515 DBG(" SMT disabled ! nthreads forced to 1\n"); 516 nthreads = 1; 517 } 518 519 #ifdef CONFIG_PPC64 520 /* 521 * On pSeries LPAR, we need to know how many cpus 522 * could possibly be added to this partition. 523 */ 524 if (firmware_has_feature(FW_FEATURE_LPAR) && 525 (dn = of_find_node_by_path("/rtas"))) { 526 int num_addr_cell, num_size_cell, maxcpus; 527 const __be32 *ireg; 528 529 num_addr_cell = of_n_addr_cells(dn); 530 num_size_cell = of_n_size_cells(dn); 531 532 ireg = of_get_property(dn, "ibm,lrdr-capacity", NULL); 533 534 if (!ireg) 535 goto out; 536 537 maxcpus = be32_to_cpup(ireg + num_addr_cell + num_size_cell); 538 539 /* Double maxcpus for processors which have SMT capability */ 540 if (cpu_has_feature(CPU_FTR_SMT)) 541 maxcpus *= nthreads; 542 543 if (maxcpus > nr_cpu_ids) { 544 printk(KERN_WARNING 545 "Partition configured for %d cpus, " 546 "operating system maximum is %u.\n", 547 maxcpus, nr_cpu_ids); 548 maxcpus = nr_cpu_ids; 549 } else 550 printk(KERN_INFO "Partition configured for %d cpus.\n", 551 maxcpus); 552 553 for (cpu = 0; cpu < maxcpus; cpu++) 554 set_cpu_possible(cpu, true); 555 out: 556 of_node_put(dn); 557 } 558 vdso_data->processorCount = num_present_cpus(); 559 #endif /* CONFIG_PPC64 */ 560 561 /* Initialize CPU <=> thread mapping/ 562 * 563 * WARNING: We assume that the number of threads is the same for 564 * every CPU in the system. If that is not the case, then some code 565 * here will have to be reworked 566 */ 567 cpu_init_thread_core_maps(nthreads); 568 569 /* Now that possible cpus are set, set nr_cpu_ids for later use */ 570 setup_nr_cpu_ids(); 571 572 free_unused_pacas(); 573 } 574 #endif /* CONFIG_SMP */ 575 576 #ifdef CONFIG_PCSPKR_PLATFORM 577 static __init int add_pcspkr(void) 578 { 579 struct device_node *np; 580 struct platform_device *pd; 581 int ret; 582 583 np = of_find_compatible_node(NULL, NULL, "pnpPNP,100"); 584 of_node_put(np); 585 if (!np) 586 return -ENODEV; 587 588 pd = platform_device_alloc("pcspkr", -1); 589 if (!pd) 590 return -ENOMEM; 591 592 ret = platform_device_add(pd); 593 if (ret) 594 platform_device_put(pd); 595 596 return ret; 597 } 598 device_initcall(add_pcspkr); 599 #endif /* CONFIG_PCSPKR_PLATFORM */ 600 601 void probe_machine(void) 602 { 603 extern struct machdep_calls __machine_desc_start; 604 extern struct machdep_calls __machine_desc_end; 605 unsigned int i; 606 607 /* 608 * Iterate all ppc_md structures until we find the proper 609 * one for the current machine type 610 */ 611 DBG("Probing machine type ...\n"); 612 613 /* 614 * Check ppc_md is empty, if not we have a bug, ie, we setup an 615 * entry before probe_machine() which will be overwritten 616 */ 617 for (i = 0; i < (sizeof(ppc_md) / sizeof(void *)); i++) { 618 if (((void **)&ppc_md)[i]) { 619 printk(KERN_ERR "Entry %d in ppc_md non empty before" 620 " machine probe !\n", i); 621 } 622 } 623 624 for (machine_id = &__machine_desc_start; 625 machine_id < &__machine_desc_end; 626 machine_id++) { 627 DBG(" %s ...", machine_id->name); 628 memcpy(&ppc_md, machine_id, sizeof(struct machdep_calls)); 629 if (ppc_md.probe()) { 630 DBG(" match !\n"); 631 break; 632 } 633 DBG("\n"); 634 } 635 /* What can we do if we didn't find ? */ 636 if (machine_id >= &__machine_desc_end) { 637 DBG("No suitable machine found !\n"); 638 for (;;); 639 } 640 641 printk(KERN_INFO "Using %s machine description\n", ppc_md.name); 642 } 643 644 /* Match a class of boards, not a specific device configuration. */ 645 int check_legacy_ioport(unsigned long base_port) 646 { 647 struct device_node *parent, *np = NULL; 648 int ret = -ENODEV; 649 650 switch(base_port) { 651 case I8042_DATA_REG: 652 if (!(np = of_find_compatible_node(NULL, NULL, "pnpPNP,303"))) 653 np = of_find_compatible_node(NULL, NULL, "pnpPNP,f03"); 654 if (np) { 655 parent = of_get_parent(np); 656 657 of_i8042_kbd_irq = irq_of_parse_and_map(parent, 0); 658 if (!of_i8042_kbd_irq) 659 of_i8042_kbd_irq = 1; 660 661 of_i8042_aux_irq = irq_of_parse_and_map(parent, 1); 662 if (!of_i8042_aux_irq) 663 of_i8042_aux_irq = 12; 664 665 of_node_put(np); 666 np = parent; 667 break; 668 } 669 np = of_find_node_by_type(NULL, "8042"); 670 /* Pegasos has no device_type on its 8042 node, look for the 671 * name instead */ 672 if (!np) 673 np = of_find_node_by_name(NULL, "8042"); 674 if (np) { 675 of_i8042_kbd_irq = 1; 676 of_i8042_aux_irq = 12; 677 } 678 break; 679 case FDC_BASE: /* FDC1 */ 680 np = of_find_node_by_type(NULL, "fdc"); 681 break; 682 default: 683 /* ipmi is supposed to fail here */ 684 break; 685 } 686 if (!np) 687 return ret; 688 parent = of_get_parent(np); 689 if (parent) { 690 if (of_node_is_type(parent, "isa")) 691 ret = 0; 692 of_node_put(parent); 693 } 694 of_node_put(np); 695 return ret; 696 } 697 EXPORT_SYMBOL(check_legacy_ioport); 698 699 static int ppc_panic_event(struct notifier_block *this, 700 unsigned long event, void *ptr) 701 { 702 /* 703 * panic does a local_irq_disable, but we really 704 * want interrupts to be hard disabled. 705 */ 706 hard_irq_disable(); 707 708 /* 709 * If firmware-assisted dump has been registered then trigger 710 * firmware-assisted dump and let firmware handle everything else. 711 */ 712 crash_fadump(NULL, ptr); 713 if (ppc_md.panic) 714 ppc_md.panic(ptr); /* May not return */ 715 return NOTIFY_DONE; 716 } 717 718 static struct notifier_block ppc_panic_block = { 719 .notifier_call = ppc_panic_event, 720 .priority = INT_MIN /* may not return; must be done last */ 721 }; 722 723 void __init setup_panic(void) 724 { 725 /* PPC64 always does a hard irq disable in its panic handler */ 726 if (!IS_ENABLED(CONFIG_PPC64) && !ppc_md.panic) 727 return; 728 atomic_notifier_chain_register(&panic_notifier_list, &ppc_panic_block); 729 } 730 731 #ifdef CONFIG_CHECK_CACHE_COHERENCY 732 /* 733 * For platforms that have configurable cache-coherency. This function 734 * checks that the cache coherency setting of the kernel matches the setting 735 * left by the firmware, as indicated in the device tree. Since a mismatch 736 * will eventually result in DMA failures, we print * and error and call 737 * BUG() in that case. 738 */ 739 740 #ifdef CONFIG_NOT_COHERENT_CACHE 741 #define KERNEL_COHERENCY 0 742 #else 743 #define KERNEL_COHERENCY 1 744 #endif 745 746 static int __init check_cache_coherency(void) 747 { 748 struct device_node *np; 749 const void *prop; 750 int devtree_coherency; 751 752 np = of_find_node_by_path("/"); 753 prop = of_get_property(np, "coherency-off", NULL); 754 of_node_put(np); 755 756 devtree_coherency = prop ? 0 : 1; 757 758 if (devtree_coherency != KERNEL_COHERENCY) { 759 printk(KERN_ERR 760 "kernel coherency:%s != device tree_coherency:%s\n", 761 KERNEL_COHERENCY ? "on" : "off", 762 devtree_coherency ? "on" : "off"); 763 BUG(); 764 } 765 766 return 0; 767 } 768 769 late_initcall(check_cache_coherency); 770 #endif /* CONFIG_CHECK_CACHE_COHERENCY */ 771 772 #ifdef CONFIG_DEBUG_FS 773 struct dentry *powerpc_debugfs_root; 774 EXPORT_SYMBOL(powerpc_debugfs_root); 775 776 static int powerpc_debugfs_init(void) 777 { 778 powerpc_debugfs_root = debugfs_create_dir("powerpc", NULL); 779 780 return powerpc_debugfs_root == NULL; 781 } 782 arch_initcall(powerpc_debugfs_init); 783 #endif 784 785 void ppc_printk_progress(char *s, unsigned short hex) 786 { 787 pr_info("%s\n", s); 788 } 789 790 void arch_setup_pdev_archdata(struct platform_device *pdev) 791 { 792 pdev->archdata.dma_mask = DMA_BIT_MASK(32); 793 pdev->dev.dma_mask = &pdev->archdata.dma_mask; 794 set_dma_ops(&pdev->dev, &dma_nommu_ops); 795 } 796 797 static __init void print_system_info(void) 798 { 799 pr_info("-----------------------------------------------------\n"); 800 #ifdef CONFIG_PPC_BOOK3S_64 801 pr_info("ppc64_pft_size = 0x%llx\n", ppc64_pft_size); 802 #endif 803 #ifdef CONFIG_PPC_BOOK3S_32 804 pr_info("Hash_size = 0x%lx\n", Hash_size); 805 #endif 806 pr_info("phys_mem_size = 0x%llx\n", 807 (unsigned long long)memblock_phys_mem_size()); 808 809 pr_info("dcache_bsize = 0x%x\n", dcache_bsize); 810 pr_info("icache_bsize = 0x%x\n", icache_bsize); 811 if (ucache_bsize != 0) 812 pr_info("ucache_bsize = 0x%x\n", ucache_bsize); 813 814 pr_info("cpu_features = 0x%016lx\n", cur_cpu_spec->cpu_features); 815 pr_info(" possible = 0x%016lx\n", 816 (unsigned long)CPU_FTRS_POSSIBLE); 817 pr_info(" always = 0x%016lx\n", 818 (unsigned long)CPU_FTRS_ALWAYS); 819 pr_info("cpu_user_features = 0x%08x 0x%08x\n", 820 cur_cpu_spec->cpu_user_features, 821 cur_cpu_spec->cpu_user_features2); 822 pr_info("mmu_features = 0x%08x\n", cur_cpu_spec->mmu_features); 823 #ifdef CONFIG_PPC64 824 pr_info("firmware_features = 0x%016lx\n", powerpc_firmware_features); 825 #endif 826 827 #ifdef CONFIG_PPC_BOOK3S_64 828 if (htab_address) 829 pr_info("htab_address = 0x%p\n", htab_address); 830 if (htab_hash_mask) 831 pr_info("htab_hash_mask = 0x%lx\n", htab_hash_mask); 832 #endif 833 #ifdef CONFIG_PPC_BOOK3S_32 834 if (Hash) 835 pr_info("Hash = 0x%p\n", Hash); 836 if (Hash_mask) 837 pr_info("Hash_mask = 0x%lx\n", Hash_mask); 838 #endif 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 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(__pa(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 *cmdline_p = boot_command_line; 870 871 /* Set a half-reasonable default so udelay does something sensible */ 872 loops_per_jiffy = 500000000 / HZ; 873 874 /* Unflatten the device-tree passed by prom_init or kexec */ 875 unflatten_device_tree(); 876 877 /* 878 * Initialize cache line/block info from device-tree (on ppc64) or 879 * just cputable (on ppc32). 880 */ 881 initialize_cache_info(); 882 883 /* Initialize RTAS if available. */ 884 rtas_initialize(); 885 886 /* Check if we have an initrd provided via the device-tree. */ 887 check_for_initrd(); 888 889 /* Probe the machine type, establish ppc_md. */ 890 probe_machine(); 891 892 /* Setup panic notifier if requested by the platform. */ 893 setup_panic(); 894 895 /* 896 * Configure ppc_md.power_save (ppc32 only, 64-bit machines do 897 * it from their respective probe() function. 898 */ 899 setup_power_save(); 900 901 /* Discover standard serial ports. */ 902 find_legacy_serial_ports(); 903 904 /* Register early console with the printk subsystem. */ 905 register_early_udbg_console(); 906 907 /* Setup the various CPU maps based on the device-tree. */ 908 smp_setup_cpu_maps(); 909 910 /* Initialize xmon. */ 911 xmon_setup(); 912 913 /* Check the SMT related command line arguments (ppc64). */ 914 check_smt_enabled(); 915 916 /* Parse memory topology */ 917 mem_topology_setup(); 918 919 /* 920 * Release secondary cpus out of their spinloops at 0x60 now that 921 * we can map physical -> logical CPU ids. 922 * 923 * Freescale Book3e parts spin in a loop provided by firmware, 924 * so smp_release_cpus() does nothing for them. 925 */ 926 #ifdef CONFIG_SMP 927 smp_setup_pacas(); 928 929 /* On BookE, setup per-core TLB data structures. */ 930 setup_tlb_core_data(); 931 932 smp_release_cpus(); 933 #endif 934 935 /* Print various info about the machine that has been gathered so far. */ 936 print_system_info(); 937 938 /* Reserve large chunks of memory for use by CMA for KVM. */ 939 kvm_cma_reserve(); 940 941 klp_init_thread_info(&init_thread_info); 942 943 init_mm.start_code = (unsigned long)_stext; 944 init_mm.end_code = (unsigned long) _etext; 945 init_mm.end_data = (unsigned long) _edata; 946 init_mm.brk = klimit; 947 948 #ifdef CONFIG_PPC_MM_SLICES 949 #ifdef CONFIG_PPC64 950 if (!radix_enabled()) 951 init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW_USER64; 952 #elif defined(CONFIG_PPC_8xx) 953 init_mm.context.slb_addr_limit = DEFAULT_MAP_WINDOW; 954 #else 955 #error "context.addr_limit not initialized." 956 #endif 957 #endif 958 959 #ifdef CONFIG_SPAPR_TCE_IOMMU 960 mm_iommu_init(&init_mm); 961 #endif 962 irqstack_early_init(); 963 exc_lvl_early_init(); 964 emergency_stack_init(); 965 966 initmem_init(); 967 968 early_memtest(min_low_pfn << PAGE_SHIFT, max_low_pfn << PAGE_SHIFT); 969 970 #ifdef CONFIG_DUMMY_CONSOLE 971 conswitchp = &dummy_con; 972 #endif 973 if (ppc_md.setup_arch) 974 ppc_md.setup_arch(); 975 976 setup_barrier_nospec(); 977 setup_spectre_v2(); 978 979 paging_init(); 980 981 /* Initialize the MMU context management stuff. */ 982 mmu_context_init(); 983 984 #ifdef CONFIG_PPC64 985 /* Interrupt code needs to be 64K-aligned. */ 986 if ((unsigned long)_stext & 0xffff) 987 panic("Kernelbase not 64K-aligned (0x%lx)!\n", 988 (unsigned long)_stext); 989 #endif 990 } 991