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/seq_file.h>
  24 #include <linux/ioport.h>
  25 #include <linux/console.h>
  26 #include <linux/utsname.h>
  27 #include <linux/tty.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/bootmem.h>
  35 #include <linux/pci.h>
  36 #include <linux/lockdep.h>
  37 #include <linux/lmb.h>
  38 #include <asm/io.h>
  39 #include <asm/kdump.h>
  40 #include <asm/prom.h>
  41 #include <asm/processor.h>
  42 #include <asm/pgtable.h>
  43 #include <asm/smp.h>
  44 #include <asm/elf.h>
  45 #include <asm/machdep.h>
  46 #include <asm/paca.h>
  47 #include <asm/time.h>
  48 #include <asm/cputable.h>
  49 #include <asm/sections.h>
  50 #include <asm/btext.h>
  51 #include <asm/nvram.h>
  52 #include <asm/setup.h>
  53 #include <asm/system.h>
  54 #include <asm/rtas.h>
  55 #include <asm/iommu.h>
  56 #include <asm/serial.h>
  57 #include <asm/cache.h>
  58 #include <asm/page.h>
  59 #include <asm/mmu.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 = of_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         /* -------- printk is _NOT_ safe to use here ! ------- */
 174
 175         /* Fill in any unititialised pacas */
 176         initialise_pacas();
 177
 178         /* Identify CPU type */
 179         identify_cpu(0, mfspr(SPRN_PVR));
 180
 181         /* Assume we're on cpu 0 for now. Don't write to the paca yet! */
 182         setup_paca(0);
 183
 184         /* Initialize lockdep early or else spinlocks will blow */
 185         lockdep_init();
 186
 187         /* -------- printk is now safe to use ------- */
 188
 189         /* Enable early debugging if any specified (see udbg.h) */
 190         udbg_early_init();
 191
 192         DBG(" -> early_setup(), dt_ptr: 0x%lx\n", dt_ptr);
 193
 194         /*
 195          * Do early initialization using the flattened device
 196          * tree, such as retrieving the physical memory map or
 197          * calculating/retrieving the hash table size.
 198          */
 199         early_init_devtree(__va(dt_ptr));
 200
 201         /* Now we know the logical id of our boot cpu, setup the paca. */
 202         setup_paca(boot_cpuid);
 203
 204         /* Fix up paca fields required for the boot cpu */
 205         get_paca()->cpu_start = 1;
 206         get_paca()->stab_real = __pa((u64)&initial_stab);
 207         get_paca()->stab_addr = (u64)&initial_stab;
 208
 209         /* Probe the machine type */
 210         probe_machine();
 211
 212         setup_kdump_trampoline();
 213
 214         DBG("Found, Initializing memory management...\n");
 215
 216         /*
 217          * Initialize the MMU Hash table and create the linear mapping
 218          * of memory. Has to be done before stab/slb initialization as
 219          * this is currently where the page size encoding is obtained
 220          */
 221         htab_initialize();
 222
 223         /*
 224          * Initialize stab / SLB management except on iSeries
 225          */
 226         if (cpu_has_feature(CPU_FTR_SLB))
 227                 slb_initialize();
 228         else if (!firmware_has_feature(FW_FEATURE_ISERIES))
 229                 stab_initialize(get_paca()->stab_real);
 230
 231         DBG(" <- early_setup()\n");
 232 }
 233
 234 #ifdef CONFIG_SMP
 235 void early_setup_secondary(void)
 236 {
 237         struct paca_struct *lpaca = get_paca();
 238
 239         /* Mark interrupts enabled in PACA */
 240         lpaca->soft_enabled = 0;
 241
 242         /* Initialize hash table for that CPU */
 243         htab_initialize_secondary();
 244
 245         /* Initialize STAB/SLB. We use a virtual address as it works
 246          * in real mode on pSeries and we want a virutal address on
 247          * iSeries anyway
 248          */
 249         if (cpu_has_feature(CPU_FTR_SLB))
 250                 slb_initialize();
 251         else
 252                 stab_initialize(lpaca->stab_addr);
 253 }
 254
 255 #endif /* CONFIG_SMP */
 256
 257 #if defined(CONFIG_SMP) || defined(CONFIG_KEXEC)
 258 extern unsigned long __secondary_hold_spinloop;
 259 extern void generic_secondary_smp_init(void);
 260
 261 void smp_release_cpus(void)
 262 {
 263         unsigned long *ptr;
 264
 265         DBG(" -> smp_release_cpus()\n");
 266
 267         /* All secondary cpus are spinning on a common spinloop, release them
 268          * all now so they can start to spin on their individual paca
 269          * spinloops. For non SMP kernels, the secondary cpus never get out
 270          * of the common spinloop.
 271          */
 272
 273         ptr  = (unsigned long *)((unsigned long)&__secondary_hold_spinloop
 274                         - PHYSICAL_START);
 275         *ptr = __pa(generic_secondary_smp_init);
 276         mb();
 277
 278         DBG(" <- smp_release_cpus()\n");
 279 }
 280 #endif /* CONFIG_SMP || CONFIG_KEXEC */
 281
 282 /*
 283  * Initialize some remaining members of the ppc64_caches and systemcfg
 284  * structures
 285  * (at least until we get rid of them completely). This is mostly some
 286  * cache informations about the CPU that will be used by cache flush
 287  * routines and/or provided to userland
 288  */
 289 static void __init initialize_cache_info(void)
 290 {
 291         struct device_node *np;
 292         unsigned long num_cpus = 0;
 293
 294         DBG(" -> initialize_cache_info()\n");
 295
 296         for (np = NULL; (np = of_find_node_by_type(np, "cpu"));) {
 297                 num_cpus += 1;
 298
 299                 /* We're assuming *all* of the CPUs have the same
 300                  * d-cache and i-cache sizes... -Peter
 301                  */
 302
 303                 if ( num_cpus == 1 ) {
 304                         const u32 *sizep, *lsizep;
 305                         u32 size, lsize;
 306
 307                         size = 0;
 308                         lsize = cur_cpu_spec->dcache_bsize;
 309                         sizep = of_get_property(np, "d-cache-size", NULL);
 310                         if (sizep != NULL)
 311                                 size = *sizep;
 312                         lsizep = of_get_property(np, "d-cache-block-size", NULL);
 313                         /* fallback if block size missing */
 314                         if (lsizep == NULL)
 315                                 lsizep = of_get_property(np, "d-cache-line-size", NULL);
 316                         if (lsizep != NULL)
 317                                 lsize = *lsizep;
 318                         if (sizep == 0 || lsizep == 0)
 319                                 DBG("Argh, can't find dcache properties ! "
 320                                     "sizep: %p, lsizep: %p\n", sizep, lsizep);
 321
 322                         ppc64_caches.dsize = size;
 323                         ppc64_caches.dline_size = lsize;
 324                         ppc64_caches.log_dline_size = __ilog2(lsize);
 325                         ppc64_caches.dlines_per_page = PAGE_SIZE / lsize;
 326
 327                         size = 0;
 328                         lsize = cur_cpu_spec->icache_bsize;
 329                         sizep = of_get_property(np, "i-cache-size", NULL);
 330                         if (sizep != NULL)
 331                                 size = *sizep;
 332                         lsizep = of_get_property(np, "i-cache-block-size", NULL);
 333                         if (lsizep == NULL)
 334                                 lsizep = of_get_property(np, "i-cache-line-size", NULL);
 335                         if (lsizep != NULL)
 336                                 lsize = *lsizep;
 337                         if (sizep == 0 || lsizep == 0)
 338                                 DBG("Argh, can't find icache properties ! "
 339                                     "sizep: %p, lsizep: %p\n", sizep, lsizep);
 340
 341                         ppc64_caches.isize = size;
 342                         ppc64_caches.iline_size = lsize;
 343                         ppc64_caches.log_iline_size = __ilog2(lsize);
 344                         ppc64_caches.ilines_per_page = PAGE_SIZE / lsize;
 345                 }
 346         }
 347
 348         DBG(" <- initialize_cache_info()\n");
 349 }
 350
 351
 352 /*
 353  * Do some initial setup of the system.  The parameters are those which
 354  * were passed in from the bootloader.
 355  */
 356 void __init setup_system(void)
 357 {
 358         DBG(" -> setup_system()\n");
 359
 360         /* Apply the CPUs-specific and firmware specific fixups to kernel
 361          * text (nop out sections not relevant to this CPU or this firmware)
 362          */
 363         do_feature_fixups(cur_cpu_spec->cpu_features,
 364                           &__start___ftr_fixup, &__stop___ftr_fixup);
 365         do_feature_fixups(powerpc_firmware_features,
 366                           &__start___fw_ftr_fixup, &__stop___fw_ftr_fixup);
 367         do_lwsync_fixups(cur_cpu_spec->cpu_features,
 368                          &__start___lwsync_fixup, &__stop___lwsync_fixup);
 369
 370         /*
 371          * Unflatten the device-tree passed by prom_init or kexec
 372          */
 373         unflatten_device_tree();
 374
 375         /*
 376          * Fill the ppc64_caches & systemcfg structures with informations
 377          * retrieved from the device-tree.
 378          */
 379         initialize_cache_info();
 380
 381         /*
 382          * Initialize irq remapping subsystem
 383          */
 384         irq_early_init();
 385
 386 #ifdef CONFIG_PPC_RTAS
 387         /*
 388          * Initialize RTAS if available
 389          */
 390         rtas_initialize();
 391 #endif /* CONFIG_PPC_RTAS */
 392
 393         /*
 394          * Check if we have an initrd provided via the device-tree
 395          */
 396         check_for_initrd();
 397
 398         /*
 399          * Do some platform specific early initializations, that includes
 400          * setting up the hash table pointers. It also sets up some interrupt-mapping
 401          * related options that will be used by finish_device_tree()
 402          */
 403         if (ppc_md.init_early)
 404                 ppc_md.init_early();
 405
 406         /*
 407          * We can discover serial ports now since the above did setup the
 408          * hash table management for us, thus ioremap works. We do that early
 409          * so that further code can be debugged
 410          */
 411         find_legacy_serial_ports();
 412
 413         /*
 414          * Register early console
 415          */
 416         register_early_udbg_console();
 417
 418         /*
 419          * Initialize xmon
 420          */
 421         xmon_setup();
 422
 423         check_smt_enabled();
 424         smp_setup_cpu_maps();
 425
 426 #ifdef CONFIG_SMP
 427         /* Release secondary cpus out of their spinloops at 0x60 now that
 428          * we can map physical -> logical CPU ids
 429          */
 430         smp_release_cpus();
 431 #endif
 432
 433         printk("Starting Linux PPC64 %s\n", init_utsname()->version);
 434
 435         printk("-----------------------------------------------------\n");
 436         printk("ppc64_pft_size                = 0x%lx\n", ppc64_pft_size);
 437         printk("physicalMemorySize            = 0x%lx\n", lmb_phys_mem_size());
 438         if (ppc64_caches.dline_size != 0x80)
 439                 printk("ppc64_caches.dcache_line_size = 0x%x\n",
 440                        ppc64_caches.dline_size);
 441         if (ppc64_caches.iline_size != 0x80)
 442                 printk("ppc64_caches.icache_line_size = 0x%x\n",
 443                        ppc64_caches.iline_size);
 444         if (htab_address)
 445                 printk("htab_address                  = 0x%p\n", htab_address);
 446         printk("htab_hash_mask                = 0x%lx\n", htab_hash_mask);
 447         if (PHYSICAL_START > 0)
 448                 printk("physical_start                = 0x%lx\n",
 449                        PHYSICAL_START);
 450         printk("-----------------------------------------------------\n");
 451
 452         DBG(" <- setup_system()\n");
 453 }
 454
 455 #ifdef CONFIG_IRQSTACKS
 456 static void __init irqstack_early_init(void)
 457 {
 458         unsigned int i;
 459
 460         /*
 461          * interrupt stacks must be under 256MB, we cannot afford to take
 462          * SLB misses on them.
 463          */
 464         for_each_possible_cpu(i) {
 465                 softirq_ctx[i] = (struct thread_info *)
 466                         __va(lmb_alloc_base(THREAD_SIZE,
 467                                             THREAD_SIZE, 0x10000000));
 468                 hardirq_ctx[i] = (struct thread_info *)
 469                         __va(lmb_alloc_base(THREAD_SIZE,
 470                                             THREAD_SIZE, 0x10000000));
 471         }
 472 }
 473 #else
 474 #define irqstack_early_init()
 475 #endif
 476
 477 /*
 478  * Stack space used when we detect a bad kernel stack pointer, and
 479  * early in SMP boots before relocation is enabled.
 480  */
 481 static void __init emergency_stack_init(void)
 482 {
 483         unsigned long limit;
 484         unsigned int i;
 485
 486         /*
 487          * Emergency stacks must be under 256MB, we cannot afford to take
 488          * SLB misses on them. The ABI also requires them to be 128-byte
 489          * aligned.
 490          *
 491          * Since we use these as temporary stacks during secondary CPU
 492          * bringup, we need to get at them in real mode. This means they
 493          * must also be within the RMO region.
 494          */
 495         limit = min(0x10000000UL, lmb.rmo_size);
 496
 497         for_each_possible_cpu(i) {
 498                 unsigned long sp;
 499                 sp  = lmb_alloc_base(THREAD_SIZE, THREAD_SIZE, limit);
 500                 sp += THREAD_SIZE;
 501                 paca[i].emergency_sp = __va(sp);
 502         }
 503 }
 504
 505 /*
 506  * Called into from start_kernel, after lock_kernel has been called.
 507  * Initializes bootmem, which is unsed to manage page allocation until
 508  * mem_init is called.
 509  */
 510 void __init setup_arch(char **cmdline_p)
 511 {
 512         ppc64_boot_msg(0x12, "Setup Arch");
 513
 514         *cmdline_p = cmd_line;
 515
 516         /*
 517          * Set cache line size based on type of cpu as a default.
 518          * Systems with OF can look in the properties on the cpu node(s)
 519          * for a possibly more accurate value.
 520          */
 521         dcache_bsize = ppc64_caches.dline_size;
 522         icache_bsize = ppc64_caches.iline_size;
 523
 524         /* reboot on panic */
 525         panic_timeout = 180;
 526
 527         if (ppc_md.panic)
 528                 setup_panic();
 529
 530         init_mm.start_code = (unsigned long)_stext;
 531         init_mm.end_code = (unsigned long) _etext;
 532         init_mm.end_data = (unsigned long) _edata;
 533         init_mm.brk = klimit;
 534
 535         irqstack_early_init();
 536         emergency_stack_init();
 537
 538         stabs_alloc();
 539
 540         /* set up the bootmem stuff with available memory */
 541         do_init_bootmem();
 542         sparse_init();
 543
 544 #ifdef CONFIG_DUMMY_CONSOLE
 545         conswitchp = &dummy_con;
 546 #endif
 547
 548         if (ppc_md.setup_arch)
 549                 ppc_md.setup_arch();
 550
 551         paging_init();
 552         ppc64_boot_msg(0x15, "Setup Done");
 553 }
 554
 555
 556 /* ToDo: do something useful if ppc_md is not yet setup. */
 557 #define PPC64_LINUX_FUNCTION 0x0f000000
 558 #define PPC64_IPL_MESSAGE 0xc0000000
 559 #define PPC64_TERM_MESSAGE 0xb0000000
 560
 561 static void ppc64_do_msg(unsigned int src, const char *msg)
 562 {
 563         if (ppc_md.progress) {
 564                 char buf[128];
 565
 566                 sprintf(buf, "%08X\n", src);
 567                 ppc_md.progress(buf, 0);
 568                 snprintf(buf, 128, "%s", msg);
 569                 ppc_md.progress(buf, 0);
 570         }
 571 }
 572
 573 /* Print a boot progress message. */
 574 void ppc64_boot_msg(unsigned int src, const char *msg)
 575 {
 576         ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_IPL_MESSAGE|src, msg);
 577         printk("[boot]%04x %s\n", src, msg);
 578 }
 579
 580 /* Print a termination message (print only -- does not stop the kernel) */
 581 void ppc64_terminate_msg(unsigned int src, const char *msg)
 582 {
 583         ppc64_do_msg(PPC64_LINUX_FUNCTION|PPC64_TERM_MESSAGE|src, msg);
 584         printk("[terminate]%04x %s\n", src, msg);
 585 }
 586
 587 void cpu_die(void)
 588 {
 589         if (ppc_md.cpu_die)
 590                 ppc_md.cpu_die();
 591 }
 592
 593 #ifdef CONFIG_SMP
 594 void __init setup_per_cpu_areas(void)
 595 {
 596         int i;
 597         unsigned long size;
 598         char *ptr;
 599
 600         /* Copy section for each CPU (we discard the original) */
 601         size = ALIGN(__per_cpu_end - __per_cpu_start, PAGE_SIZE);
 602 #ifdef CONFIG_MODULES
 603         if (size < PERCPU_ENOUGH_ROOM)
 604                 size = PERCPU_ENOUGH_ROOM;
 605 #endif
 606
 607         for_each_possible_cpu(i) {
 608                 ptr = alloc_bootmem_pages_node(NODE_DATA(cpu_to_node(i)), size);
 609                 if (!ptr)
 610                         panic("Cannot allocate cpu data for CPU %d\n", i);
 611
 612                 paca[i].data_offset = ptr - __per_cpu_start;
 613                 memcpy(ptr, __per_cpu_start, __per_cpu_end - __per_cpu_start);
 614         }
 615 }
 616 #endif
 617
 618
 619 #ifdef CONFIG_PPC_INDIRECT_IO
 620 struct ppc_pci_io ppc_pci_io;
 621 EXPORT_SYMBOL(ppc_pci_io);
 622 #endif /* CONFIG_PPC_INDIRECT_IO */
 623