arch/powerpc/kernel/setup_64.c

   1 /*
   2  *
   3  * Common boot and setup code.
   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/module.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/ide.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/ioport.h>
  26 #include <linux/console.h>
  27 #include <linux/utsname.h>
  28 #include <linux/tty.h>
  29 #include <linux/root_dev.h>
  30 #include <linux/notifier.h>
  31 #include <linux/cpu.h>
  32 #include <linux/unistd.h>
  33 #include <linux/serial.h>
  34 #include <linux/serial_8250.h>
  35 #include <linux/bootmem.h>
  36 #include <linux/pci.h>
  37 #include <asm/io.h>
  38 #include <asm/kdump.h>
  39 #include <asm/prom.h>
  40 #include <asm/processor.h>
  41 #include <asm/pgtable.h>
  42 #include <asm/smp.h>
  43 #include <asm/elf.h>
  44 #include <asm/machdep.h>
  45 #include <asm/paca.h>
  46 #include <asm/time.h>
  47 #include <asm/cputable.h>
  48 #include <asm/sections.h>
  49 #include <asm/btext.h>
  50 #include <asm/nvram.h>
  51 #include <asm/setup.h>
  52 #include <asm/system.h>
  53 #include <asm/rtas.h>
  54 #include <asm/iommu.h>
  55 #include <asm/serial.h>
  56 #include <asm/cache.h>
  57 #include <asm/page.h>
  58 #include <asm/mmu.h>
  59 #include <asm/lmb.h>
  60 #include <asm/firmware.h>
  61 #include <asm/xmon.h>
  62 #include <asm/udbg.h>
  63 #include <asm/kexec.h>
  64
  65 #include "setup.h"
  66
  67 #ifdef DEBUG
  68 #define DBG(fmt...) udbg_printf(fmt)
  69 #else
  70 #define DBG(fmt...)
  71 #endif
  72
  73 int have_of = 1;
  74 int boot_cpuid = 0;
  75 u64 ppc64_pft_size;
  76
  77 /* Pick defaults since we might want to patch instructions
  78  * before we've read this from the device tree.
  79  */
  80 struct ppc64_caches ppc64_caches = {
  81         .dline_size = 0x40,
  82         .log_dline_size = 6,
  83         .iline_size = 0x40,
  84         .log_iline_size = 6
  85 };
  86 EXPORT_SYMBOL_GPL(ppc64_caches);
  87
  88 /*
  89  * These are used in binfmt_elf.c to put aux entries on the stack
  90  * for each elf executable being started.
  91  */
  92 int dcache_bsize;
  93 int icache_bsize;
  94 int ucache_bsize;
  95
  96 #ifdef CONFIG_SMP
  97
  98 static int smt_enabled_cmdline;
  99
 100 /* Look for ibm,smt-enabled OF option */
 101 static void check_smt_enabled(void)
 102 {
 103         struct device_node *dn;
 104         const char *smt_option;
 105
 106         /* Allow the command line to overrule the OF option */
 107         if (smt_enabled_cmdline)
 108                 return;
 109
 110         dn = of_find_node_by_path("/options");
 111
 112         if (dn) {
 113                 smt_option = get_property(dn, "ibm,smt-enabled", NULL);
 114
 115                 if (smt_option) {
 116                         if (!strcmp(smt_option, "on"))
 117                                 smt_enabled_at_boot = 1;
 118                         else if (!strcmp(smt_option, "off"))
 119                                 smt_enabled_at_boot = 0;
 120                 }
 121         }
 122 }
 123
 124 /* Look for smt-enabled= cmdline option */
 125 static int __init early_smt_enabled(char *p)
 126 {
 127         smt_enabled_cmdline = 1;
 128
 129         if (!p)
 130                 return 0;
 131
 132         if (!strcmp(p, "on") || !strcmp(p, "1"))
 133                 smt_enabled_at_boot = 1;
 134         else if (!strcmp(p, "off") || !strcmp(p, "0"))
 135                 smt_enabled_at_boot = 0;
 136
 137         return 0;
 138 }
 139 early_param("smt-enabled", early_smt_enabled);
 140
 141 #else
 142 #define check_smt_enabled()
 143 #endif /* CONFIG_SMP */
 144
 145 /* Put the paca pointer into r13 and SPRG3 */
 146 void __init setup_paca(int cpu)
 147 {
 148         local_paca = &paca[cpu];
 149         mtspr(SPRN_SPRG3, local_paca);
 150 }
 151
 152 /*
 153  * Early initialization entry point. This is called by head.S
 154  * with MMU translation disabled. We rely on the "feature" of
 155  * the CPU that ignores the top 2 bits of the address in real
 156  * mode so we can access kernel globals normally provided we
 157  * only toy with things in the RMO region. From here, we do
 158  * some early parsing of the device-tree to setup out LMB
 159  * data structures, and allocate & initialize the hash table
 160  * and segment tables so we can start running with translation
 161  * enabled.
 162  *
 163  * It is this function which will call the probe() callback of
 164  * the various platform types and copy the matching one to the
 165  * global ppc_md structure. Your platform can eventually do
 166  * some very early initializations from the probe() routine, but
 167  * this is not recommended, be very careful as, for example, the
 168  * device-tree is not accessible via normal means at this point.
 169  */
 170
 171 void __init early_setup(unsigned long dt_ptr)
 172 {
 173         /* Identify CPU type */
 174         identify_cpu(0, mfspr(SPRN_PVR));
 175
 176         /* Assume we're on cpu 0 for now. Don't write to the paca yet! */
 177         setup_paca(0);
 178
 179         /* Enable early debugging if any specified (see udbg.h) */
 180         udbg_early_init();
 181
 182         DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
 183
 184         /*
 185          * Do early initializations using the flattened device
 186          * tree, like retreiving the physical memory map or
 187          * calculating/retreiving the hash table size
 188          */
 189         early_init_devtree(__va(dt_ptr));
 190
 191         /* Now we know the logical id of our boot cpu, setup the paca. */
 192         setup_paca(boot_cpuid);
 193
 194         /* Fix up paca fields required for the boot cpu */
 195         get_paca()->cpu_start = 1;
 196         get_paca()->stab_real = __pa((u64)&initial_stab);
 197         get_paca()->stab_addr = (u64)&initial_stab;
 198
 199         /* Probe the machine type */
 200         probe_machine();
 201
 202         setup_kdump_trampoline();
 203
 204         DBG("Found, Initializing memory management...\n");
 205
 206         /*
 207          * Initialize the MMU Hash table and create the linear mapping
 208          * of memory. Has to be done before stab/slb initialization as
 209          * this is currently where the page size encoding is obtained
 210          */
 211         htab_initialize();
 212
 213         /*
 214          * Initialize stab / SLB management except on iSeries
 215          */
 216         if (cpu_has_feature(CPU_FTR_SLB))
 217                 slb_initialize();
 218         else if (!firmware_has_feature(FW_FEATURE_ISERIES))
 219                 stab_initialize(get_paca()->stab_real);
 220
 221         DBG(" <- early_setup()\n");
 222 }
 223
 224 #ifdef CONFIG_SMP
 225 void early_setup_secondary(void)
 226 {
 227         struct paca_struct *lpaca = get_paca();
 228
 229         /* Mark interrupts enabled in PACA */
 230         lpaca->soft_enabled = 0;
 231
 232         /* Initialize hash table for that CPU */
 233         htab_initialize_secondary();
 234
 235         /* Initialize STAB/SLB. We use a virtual address as it works
 236          * in real mode on pSeries and we want a virutal address on
 237          * iSeries anyway
 238          */
 239         if (cpu_has_feature(CPU_FTR_SLB))
 240                 slb_initialize();
 241         else
 242                 stab_initialize(lpaca->stab_addr);
 243 }
 244
 245 #endif /* CONFIG_SMP */
 246
 247 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
 248 void smp_release_cpus(void)
 249 {
 250         extern unsigned long __secondary_hold_spinloop;
 251         unsigned long *ptr;
 252
 253         DBG(" -> smp_release_cpus()\n");
 254
 255         /* All secondary cpus are spinning on a common spinloop, release them
 256          * all now so they can start to spin on their individual paca
 257          * spinloops. For non SMP kernels, the secondary cpus never get out
 258          * of the common spinloop.
 259          * This is useless but harmless on iSeries, secondaries are already
 260          * waiting on their paca spinloops. */
 261
 262         ptr  = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
 263                         - PHYSICAL_START);
 264         *ptr = 1;
 265         mb();
 266
 267         DBG(" <- smp_release_cpus()\n");
 268 }
 269 #endif /* CONFIG_SMP || CONFIG_KEXEC */
 270
 271 /*
 272  * Initialize some remaining members of the ppc64_caches and systemcfg
 273  * structures
 274  * (at least until we get rid of them completely). This is mostly some
 275  * cache informations about the CPU that will be used by cache flush
 276  * routines and/or provided to userland
 277  */
 278 static void __init initialize_cache_info(void)
 279 {
 280         struct device_node *np;
 281         unsigned long num_cpus = 0;
 282
 283         DBG(" -> initialize_cache_info()\n");
 284
 285         for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
 286                 num_cpus += 1;
 287
 288                 /* We're assuming *all* of the CPUs have the same
 289                  * d-cache and i-cache sizes... -Peter
 290                  */
 291
 292                 if ( num_cpus == 1 ) {
 293                         const u32 *sizep, *lsizep;
 294                         u32 size, lsize;
 295                         const char *dc, *ic;
 296
 297                         /* Then read cache informations */
 298                         if (machine_is(powermac)) {
 299                                 dc = "d-cache-block-size";
 300                                 ic = "i-cache-block-size";
 301                         } else {
 302                                 dc = "d-cache-line-size";
 303                                 ic = "i-cache-line-size";
 304                         }
 305
 306                         size = 0;
 307                         lsize = cur_cpu_spec->dcache_bsize;
 308                         sizep = get_property(np, "d-cache-size", NULL);
 309                         if (sizep != NULL)
 310                                 size = *sizep;
 311                         lsizep = get_property(np, dc, NULL);
 312                         if (lsizep != NULL)
 313                                 lsize = *lsizep;
 314                         if (sizep == 0 || lsizep == 0)
 315                                 DBG("Argh, can't find dcache properties ! "
 316                                     "sizep: %p, lsizep: %p\n", sizep, lsizep);
 317
 318                         ppc64_caches.dsize = size;
 319                         ppc64_caches.dline_size = lsize;
 320                         ppc64_caches.log_dline_size = __ilog2(lsize);
 321                         ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
 322
 323                         size = 0;
 324                         lsize = cur_cpu_spec->icache_bsize;
 325                         sizep = get_property(np, "i-cache-size", NULL);
 326                         if (sizep != NULL)
 327                                 size = *sizep;
 328                         lsizep = get_property(np, ic, NULL);
 329                         if (lsizep != NULL)
 330                                 lsize = *lsizep;
 331                         if (sizep == 0 || lsizep == 0)
 332                                 DBG("Argh, can't find icache properties ! "
 333                                     "sizep: %p, lsizep: %p\n", sizep, lsizep);
 334
 335                         ppc64_caches.isize = size;
 336                         ppc64_caches.iline_size = lsize;
 337                         ppc64_caches.log_iline_size = __ilog2(lsize);
 338                         ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
 339                 }
 340         }
 341
 342         DBG(" <- initialize_cache_info()\n");
 343 }
 344
 345
 346 /*
 347  * Do some initial setup of the system.  The parameters are those which
 348  * were passed in from the bootloader.
 349  */
 350 void __init setup_system(void)
 351 {
 352         DBG(" -> setup_system()\n");
 353
 354         /* Apply the CPUs-specific and firmware specific fixups to kernel
 355          * text (nop out sections not relevant to this CPU or this firmware)
 356          */
 357         do_feature_fixups(cur_cpu_spec->cpu_features,
 358                           &__start___ftr_fixup, &__stop___ftr_fixup);
 359         do_feature_fixups(powerpc_firmware_features,
 360                           &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
 361
 362         /*
 363          * Unflatten the device-tree passed by prom_init or kexec
 364          */
 365         unflatten_device_tree();
 366
 367         /*
 368          * Fill the ppc64_caches & systemcfg structures with informations
 369          * retrieved from the device-tree.
 370          */
 371         initialize_cache_info();
 372
 373         /*
 374          * Initialize irq remapping subsystem
 375          */
 376         irq_early_init();
 377
 378 #ifdef CONFIG_PPC_RTAS
 379         /*
 380          * Initialize RTAS if available
 381          */
 382         rtas_initialize();
 383 #endif /* CONFIG_PPC_RTAS */
 384
 385         /*
 386          * Check if we have an initrd provided via the device-tree
 387          */
 388         check_for_initrd();
 389
 390         /*
 391          * Do some platform specific early initializations, that includes
 392          * setting up the hash table pointers. It also sets up some interrupt-mapping
 393          * related options that will be used by finish_device_tree()
 394          */
 395         if (ppc_md.init_early)
 396                 ppc_md.init_early();
 397
 398         /*
 399          * We can discover serial ports now since the above did setup the
 400          * hash table management for us, thus ioremap works. We do that early
 401          * so that further code can be debugged
 402          */
 403         find_legacy_serial_ports();
 404
 405         /*
 406          * Register early console
 407          */
 408         register_early_udbg_console();
 409
 410         /*
 411          * Initialize xmon
 412          */
 413         xmon_setup();
 414
 415         check_smt_enabled();
 416         smp_setup_cpu_maps();
 417
 418 #ifdef CONFIG_SMP
 419         /* Release secondary cpus out of their spinloops at 0x60 now that
 420          * we can map physical -> logical CPU ids
 421          */
 422         smp_release_cpus();
 423 #endif
 424
 425         printk("Starting Linux PPC64 %s\n", init_utsname()->version);
 426
 427         printk("-----------------------------------------------------\n");
 428         printk("ppc64_pft_size                = 0x%lx\n", ppc64_pft_size);
 429         printk("physicalMemorySize            = 0x%lx\n", lmb_phys_mem_size());
 430         printk("ppc64_caches.dcache_line_size = 0x%x\n",
 431                ppc64_caches.dline_size);
 432         printk("ppc64_caches.icache_line_size = 0x%x\n",
 433                ppc64_caches.iline_size);
 434         printk("htab_address                  = 0x%p\n", htab_address);
 435         printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
 436 #if PHYSICAL_START > 0
 437         printk("physical_start                = 0x%x\n", PHYSICAL_START);
 438 #endif
 439         printk("-----------------------------------------------------\n");
 440
 441         DBG(" <- setup_system()\n");
 442 }
 443
 444 #ifdef CONFIG_IRQSTACKS
 445 static void __init irqstack_early_init(void)
 446 {
 447         unsigned int i;
 448
 449         /*
 450          * interrupt stacks must be under 256MB, we cannot afford to take
 451          * SLB misses on them.
 452          */
 453         for_each_possible_cpu(i) {
 454                 softirq_ctx[i] = (struct thread_info *)
 455                         __va(lmb_alloc_base(THREAD_SIZE,
 456                                             THREAD_SIZE, 0x10000000));
 457                 hardirq_ctx[i] = (struct thread_info *)
 458                         __va(lmb_alloc_base(THREAD_SIZE,
 459                                             THREAD_SIZE, 0x10000000));
 460         }
 461 }
 462 #else
 463 #define irqstack_early_init()
 464 #endif
 465
 466 /*
 467  * Stack space used when we detect a bad kernel stack pointer, and
 468  * early in SMP boots before relocation is enabled.
 469  */
 470 static void __init emergency_stack_init(void)
 471 {
 472         unsigned long limit;
 473         unsigned int i;
 474
 475         /*
 476          * Emergency stacks must be under 256MB, we cannot afford to take
 477          * SLB misses on them. The ABI also requires them to be 128-byte
 478          * aligned.
 479          *
 480          * Since we use these as temporary stacks during secondary CPU
 481          * bringup, we need to get at them in real mode. This means they
 482          * must also be within the RMO region.
 483          */
 484         limit = min(0x10000000UL, lmb.rmo_size);
 485
 486         for_each_possible_cpu(i)
 487                 paca[i].emergency_sp =
 488                 __va(lmb_alloc_base(HW_PAGE_SIZE, 128, limit)) + HW_PAGE_SIZE;
 489 }
 490
 491 /*
 492  * Called into from start_kernel, after lock_kernel has been called.
 493  * Initializes bootmem, which is unsed to manage page allocation until
 494  * mem_init is called.
 495  */
 496 void __init setup_arch(char **cmdline_p)
 497 {
 498         ppc64_boot_msg(0x12, "Setup Arch");
 499
 500         *cmdline_p = cmd_line;
 501
 502         /*
 503          * Set cache line size based on type of cpu as a default.
 504          * Systems with OF can look in the properties on the cpu node(s)
 505          * for a possibly more accurate value.
 506          */
 507         dcache_bsize = ppc64_caches.dline_size;
 508         icache_bsize = ppc64_caches.iline_size;
 509
 510         /* reboot on panic */
 511         panic_timeout = 180;
 512
 513         if (ppc_md.panic)
 514                 setup_panic();
 515
 516         init_mm.start_code = PAGE_OFFSET;
 517         init_mm.end_code = (unsigned long) _etext;
 518         init_mm.end_data = (unsigned long) _edata;
 519         init_mm.brk = klimit;
 520
 521         irqstack_early_init();
 522         emergency_stack_init();
 523
 524         stabs_alloc();
 525
 526         /* set up the bootmem stuff with available memory */
 527         do_init_bootmem();
 528         sparse_init();
 529
 530 #ifdef CONFIG_DUMMY_CONSOLE
 531         conswitchp = &dummy_con;
 532 #endif
 533
 534         ppc_md.setup_arch();
 535
 536         paging_init();
 537         ppc64_boot_msg(0x15, "Setup Done");
 538 }
 539
 540
 541 /* ToDo: do something useful if ppc_md is not yet setup. */
 542 #define PPC64_LINUX_FUNCTION 0x0f000000
 543 #define PPC64_IPL_MESSAGE 0xc0000000
 544 #define PPC64_TERM_MESSAGE 0xb0000000
 545
 546 static void ppc64_do_msg(unsigned int src, const char *msg)
 547 {
 548         if (ppc_md.progress) {
 549                 char buf[128];
 550
 551                 sprintf(buf, "%08X\n", src);
 552                 ppc_md.progress(buf, 0);
 553                 snprintf(buf, 128, "%s", msg);
 554                 ppc_md.progress(buf, 0);
 555         }
 556 }
 557
 558 /* Print a boot progress message. */
 559 void ppc64_boot_msg(unsigned int src, const char *msg)
 560 {
 561         ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
 562         printk("[boot]%04x %s\n", src, msg);
 563 }
 564
 565 /* Print a termination message (print only -- does not stop the kernel) */
 566 void ppc64_terminate_msg(unsigned int src, const char *msg)
 567 {
 568         ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
 569         printk("[terminate]%04x %s\n", src, msg);
 570 }
 571
 572 void cpu_die(void)
 573 {
 574         if (ppc_md.cpu_die)
 575                 ppc_md.cpu_die();
 576 }
 577
 578 #ifdef CONFIG_SMP
 579 void __init setup_per_cpu_areas(void)
 580 {
 581         int i;
 582         unsigned long size;
 583         char *ptr;
 584
 585         /* Copy section for each CPU (we discard the original) */
 586         size = ALIGN(__per_cpu_end - __per_cpu_start, SMP_CACHE_BYTES);
 587 #ifdef CONFIG_MODULES
 588         if (size < PERCPU_ENOUGH_ROOM)
 589                 size = PERCPU_ENOUGH_ROOM;
 590 #endif
 591
 592         for_each_possible_cpu(i) {
 593                 ptr = alloc_bootmem_node(NODE_DATA(cpu_to_node(i)), size);
 594                 if (!ptr)
 595                         panic("Cannot allocate cpu data for CPU %d\n", i);
 596
 597                 paca[i].data_offset = ptr - __per_cpu_start;
 598                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
 599         }
 600 }
 601 #endif
 602
 603
 604 #ifdef CONFIG_PPC_INDIRECT_IO
 605 struct ppc_pci_io ppc_pci_io;
 606 EXPORT_SYMBOL(ppc_pci_io);
 607 #endif /* CONFIG_PPC_INDIRECT_IO */
 608