linux/arch/s390/kernel/setup.c
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   1/*
   2 *  arch/s390/kernel/setup.c
   3 *
   4 *  S390 version
   5 *    Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
   6 *    Author(s): Hartmut Penner (hp@de.ibm.com),
   7 *               Martin Schwidefsky (schwidefsky@de.ibm.com)
   8 *
   9 *  Derived from "arch/i386/kernel/setup.c"
  10 *    Copyright (C) 1995, Linus Torvalds
  11 */
  12
  13/*
  14 * This file handles the architecture-dependent parts of initialization
  15 */
  16
  17#include <linux/errno.h>
  18#include <linux/module.h>
  19#include <linux/sched.h>
  20#include <linux/kernel.h>
  21#include <linux/mm.h>
  22#include <linux/stddef.h>
  23#include <linux/unistd.h>
  24#include <linux/ptrace.h>
  25#include <linux/slab.h>
  26#include <linux/user.h>
  27#include <linux/tty.h>
  28#include <linux/ioport.h>
  29#include <linux/delay.h>
  30#include <linux/init.h>
  31#include <linux/initrd.h>
  32#include <linux/bootmem.h>
  33#include <linux/root_dev.h>
  34#include <linux/console.h>
  35#include <linux/seq_file.h>
  36#include <linux/kernel_stat.h>
  37#include <linux/device.h>
  38#include <linux/notifier.h>
  39#include <linux/pfn.h>
  40#include <linux/ctype.h>
  41#include <linux/reboot.h>
  42#include <linux/topology.h>
  43
  44#include <asm/ipl.h>
  45#include <asm/uaccess.h>
  46#include <asm/system.h>
  47#include <asm/smp.h>
  48#include <asm/mmu_context.h>
  49#include <asm/cpcmd.h>
  50#include <asm/lowcore.h>
  51#include <asm/irq.h>
  52#include <asm/page.h>
  53#include <asm/ptrace.h>
  54#include <asm/sections.h>
  55#include <asm/ebcdic.h>
  56#include <asm/compat.h>
  57#include <asm/kvm_virtio.h>
  58
  59long psw_kernel_bits    = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_PRIMARY |
  60                           PSW_MASK_MCHECK | PSW_DEFAULT_KEY);
  61long psw_user_bits      = (PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
  62                           PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
  63                           PSW_MASK_PSTATE | PSW_DEFAULT_KEY);
  64
  65/*
  66 * User copy operations.
  67 */
  68struct uaccess_ops uaccess;
  69EXPORT_SYMBOL(uaccess);
  70
  71/*
  72 * Machine setup..
  73 */
  74unsigned int console_mode = 0;
  75unsigned int console_devno = -1;
  76unsigned int console_irq = -1;
  77unsigned long machine_flags;
  78unsigned long elf_hwcap = 0;
  79char elf_platform[ELF_PLATFORM_SIZE];
  80
  81struct mem_chunk __initdata memory_chunk[MEMORY_CHUNKS];
  82volatile int __cpu_logical_map[NR_CPUS]; /* logical cpu to cpu address */
  83static unsigned long __initdata memory_end;
  84
  85/*
  86 * This is set up by the setup-routine at boot-time
  87 * for S390 need to find out, what we have to setup
  88 * using address 0x10400 ...
  89 */
  90
  91#include <asm/setup.h>
  92
  93static struct resource code_resource = {
  94        .name  = "Kernel code",
  95        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
  96};
  97
  98static struct resource data_resource = {
  99        .name = "Kernel data",
 100        .flags = IORESOURCE_BUSY | IORESOURCE_MEM,
 101};
 102
 103/*
 104 * cpu_init() initializes state that is per-CPU.
 105 */
 106void __cpuinit cpu_init(void)
 107{
 108        int addr = hard_smp_processor_id();
 109
 110        /*
 111         * Store processor id in lowcore (used e.g. in timer_interrupt)
 112         */
 113        get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 114        S390_lowcore.cpu_data.cpu_addr = addr;
 115
 116        /*
 117         * Force FPU initialization:
 118         */
 119        clear_thread_flag(TIF_USEDFPU);
 120        clear_used_math();
 121
 122        atomic_inc(&init_mm.mm_count);
 123        current->active_mm = &init_mm;
 124        if (current->mm)
 125                BUG();
 126        enter_lazy_tlb(&init_mm, current);
 127}
 128
 129/*
 130 * condev= and conmode= setup parameter.
 131 */
 132
 133static int __init condev_setup(char *str)
 134{
 135        int vdev;
 136
 137        vdev = simple_strtoul(str, &str, 0);
 138        if (vdev >= 0 && vdev < 65536) {
 139                console_devno = vdev;
 140                console_irq = -1;
 141        }
 142        return 1;
 143}
 144
 145__setup("condev=", condev_setup);
 146
 147static int __init conmode_setup(char *str)
 148{
 149#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 150        if (strncmp(str, "hwc", 4) == 0 || strncmp(str, "sclp", 5) == 0)
 151                SET_CONSOLE_SCLP;
 152#endif
 153#if defined(CONFIG_TN3215_CONSOLE)
 154        if (strncmp(str, "3215", 5) == 0)
 155                SET_CONSOLE_3215;
 156#endif
 157#if defined(CONFIG_TN3270_CONSOLE)
 158        if (strncmp(str, "3270", 5) == 0)
 159                SET_CONSOLE_3270;
 160#endif
 161        return 1;
 162}
 163
 164__setup("conmode=", conmode_setup);
 165
 166static void __init conmode_default(void)
 167{
 168        char query_buffer[1024];
 169        char *ptr;
 170
 171        if (MACHINE_IS_VM) {
 172                cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
 173                console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
 174                ptr = strstr(query_buffer, "SUBCHANNEL =");
 175                console_irq = simple_strtoul(ptr + 13, NULL, 16);
 176                cpcmd("QUERY TERM", query_buffer, 1024, NULL);
 177                ptr = strstr(query_buffer, "CONMODE");
 178                /*
 179                 * Set the conmode to 3215 so that the device recognition 
 180                 * will set the cu_type of the console to 3215. If the
 181                 * conmode is 3270 and we don't set it back then both
 182                 * 3215 and the 3270 driver will try to access the console
 183                 * device (3215 as console and 3270 as normal tty).
 184                 */
 185                cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
 186                if (ptr == NULL) {
 187#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 188                        SET_CONSOLE_SCLP;
 189#endif
 190                        return;
 191                }
 192                if (strncmp(ptr + 8, "3270", 4) == 0) {
 193#if defined(CONFIG_TN3270_CONSOLE)
 194                        SET_CONSOLE_3270;
 195#elif defined(CONFIG_TN3215_CONSOLE)
 196                        SET_CONSOLE_3215;
 197#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 198                        SET_CONSOLE_SCLP;
 199#endif
 200                } else if (strncmp(ptr + 8, "3215", 4) == 0) {
 201#if defined(CONFIG_TN3215_CONSOLE)
 202                        SET_CONSOLE_3215;
 203#elif defined(CONFIG_TN3270_CONSOLE)
 204                        SET_CONSOLE_3270;
 205#elif defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 206                        SET_CONSOLE_SCLP;
 207#endif
 208                }
 209        } else {
 210#if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
 211                SET_CONSOLE_SCLP;
 212#endif
 213        }
 214}
 215
 216#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 217static void __init setup_zfcpdump(unsigned int console_devno)
 218{
 219        static char str[41];
 220
 221        if (ipl_info.type != IPL_TYPE_FCP_DUMP)
 222                return;
 223        if (console_devno != -1)
 224                sprintf(str, " cio_ignore=all,!0.0.%04x,!0.0.%04x",
 225                        ipl_info.data.fcp.dev_id.devno, console_devno);
 226        else
 227                sprintf(str, " cio_ignore=all,!0.0.%04x",
 228                        ipl_info.data.fcp.dev_id.devno);
 229        strcat(boot_command_line, str);
 230        console_loglevel = 2;
 231}
 232#else
 233static inline void setup_zfcpdump(unsigned int console_devno) {}
 234#endif /* CONFIG_ZFCPDUMP */
 235
 236 /*
 237 * Reboot, halt and power_off stubs. They just call _machine_restart,
 238 * _machine_halt or _machine_power_off. 
 239 */
 240
 241void machine_restart(char *command)
 242{
 243        if ((!in_interrupt() && !in_atomic()) || oops_in_progress)
 244                /*
 245                 * Only unblank the console if we are called in enabled
 246                 * context or a bust_spinlocks cleared the way for us.
 247                 */
 248                console_unblank();
 249        _machine_restart(command);
 250}
 251
 252void machine_halt(void)
 253{
 254        if (!in_interrupt() || oops_in_progress)
 255                /*
 256                 * Only unblank the console if we are called in enabled
 257                 * context or a bust_spinlocks cleared the way for us.
 258                 */
 259                console_unblank();
 260        _machine_halt();
 261}
 262
 263void machine_power_off(void)
 264{
 265        if (!in_interrupt() || oops_in_progress)
 266                /*
 267                 * Only unblank the console if we are called in enabled
 268                 * context or a bust_spinlocks cleared the way for us.
 269                 */
 270                console_unblank();
 271        _machine_power_off();
 272}
 273
 274/*
 275 * Dummy power off function.
 276 */
 277void (*pm_power_off)(void) = machine_power_off;
 278
 279static int __init early_parse_mem(char *p)
 280{
 281        memory_end = memparse(p, &p);
 282        return 0;
 283}
 284early_param("mem", early_parse_mem);
 285
 286#ifdef CONFIG_S390_SWITCH_AMODE
 287#ifdef CONFIG_PGSTE
 288unsigned int switch_amode = 1;
 289#else
 290unsigned int switch_amode = 0;
 291#endif
 292EXPORT_SYMBOL_GPL(switch_amode);
 293
 294static void set_amode_and_uaccess(unsigned long user_amode,
 295                                  unsigned long user32_amode)
 296{
 297        psw_user_bits = PSW_BASE_BITS | PSW_MASK_DAT | user_amode |
 298                        PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 299                        PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 300#ifdef CONFIG_COMPAT
 301        psw_user32_bits = PSW_BASE32_BITS | PSW_MASK_DAT | user_amode |
 302                          PSW_MASK_IO | PSW_MASK_EXT | PSW_MASK_MCHECK |
 303                          PSW_MASK_PSTATE | PSW_DEFAULT_KEY;
 304        psw32_user_bits = PSW32_BASE_BITS | PSW32_MASK_DAT | user32_amode |
 305                          PSW32_MASK_IO | PSW32_MASK_EXT | PSW32_MASK_MCHECK |
 306                          PSW32_MASK_PSTATE;
 307#endif
 308        psw_kernel_bits = PSW_BASE_BITS | PSW_MASK_DAT | PSW_ASC_HOME |
 309                          PSW_MASK_MCHECK | PSW_DEFAULT_KEY;
 310
 311        if (MACHINE_HAS_MVCOS) {
 312                printk("mvcos available.\n");
 313                memcpy(&uaccess, &uaccess_mvcos_switch, sizeof(uaccess));
 314        } else {
 315                printk("mvcos not available.\n");
 316                memcpy(&uaccess, &uaccess_pt, sizeof(uaccess));
 317        }
 318}
 319
 320/*
 321 * Switch kernel/user addressing modes?
 322 */
 323static int __init early_parse_switch_amode(char *p)
 324{
 325        switch_amode = 1;
 326        return 0;
 327}
 328early_param("switch_amode", early_parse_switch_amode);
 329
 330#else /* CONFIG_S390_SWITCH_AMODE */
 331static inline void set_amode_and_uaccess(unsigned long user_amode,
 332                                         unsigned long user32_amode)
 333{
 334}
 335#endif /* CONFIG_S390_SWITCH_AMODE */
 336
 337#ifdef CONFIG_S390_EXEC_PROTECT
 338unsigned int s390_noexec = 0;
 339EXPORT_SYMBOL_GPL(s390_noexec);
 340
 341/*
 342 * Enable execute protection?
 343 */
 344static int __init early_parse_noexec(char *p)
 345{
 346        if (!strncmp(p, "off", 3))
 347                return 0;
 348        switch_amode = 1;
 349        s390_noexec = 1;
 350        return 0;
 351}
 352early_param("noexec", early_parse_noexec);
 353#endif /* CONFIG_S390_EXEC_PROTECT */
 354
 355static void setup_addressing_mode(void)
 356{
 357        if (s390_noexec) {
 358                printk("S390 execute protection active, ");
 359                set_amode_and_uaccess(PSW_ASC_SECONDARY, PSW32_ASC_SECONDARY);
 360        } else if (switch_amode) {
 361                printk("S390 address spaces switched, ");
 362                set_amode_and_uaccess(PSW_ASC_PRIMARY, PSW32_ASC_PRIMARY);
 363        }
 364#ifdef CONFIG_TRACE_IRQFLAGS
 365        sysc_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 366        io_restore_trace_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
 367#endif
 368}
 369
 370static void __init
 371setup_lowcore(void)
 372{
 373        struct _lowcore *lc;
 374        int lc_pages;
 375
 376        /*
 377         * Setup lowcore for boot cpu
 378         */
 379        lc_pages = sizeof(void *) == 8 ? 2 : 1;
 380        lc = (struct _lowcore *)
 381                __alloc_bootmem(lc_pages * PAGE_SIZE, lc_pages * PAGE_SIZE, 0);
 382        memset(lc, 0, lc_pages * PAGE_SIZE);
 383        lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY;
 384        lc->restart_psw.addr =
 385                PSW_ADDR_AMODE | (unsigned long) restart_int_handler;
 386        if (switch_amode)
 387                lc->restart_psw.mask |= PSW_ASC_HOME;
 388        lc->external_new_psw.mask = psw_kernel_bits;
 389        lc->external_new_psw.addr =
 390                PSW_ADDR_AMODE | (unsigned long) ext_int_handler;
 391        lc->svc_new_psw.mask = psw_kernel_bits | PSW_MASK_IO | PSW_MASK_EXT;
 392        lc->svc_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) system_call;
 393        lc->program_new_psw.mask = psw_kernel_bits;
 394        lc->program_new_psw.addr =
 395                PSW_ADDR_AMODE | (unsigned long)pgm_check_handler;
 396        lc->mcck_new_psw.mask =
 397                psw_kernel_bits & ~PSW_MASK_MCHECK & ~PSW_MASK_DAT;
 398        lc->mcck_new_psw.addr =
 399                PSW_ADDR_AMODE | (unsigned long) mcck_int_handler;
 400        lc->io_new_psw.mask = psw_kernel_bits;
 401        lc->io_new_psw.addr = PSW_ADDR_AMODE | (unsigned long) io_int_handler;
 402        lc->ipl_device = S390_lowcore.ipl_device;
 403        lc->clock_comparator = -1ULL;
 404        lc->kernel_stack = ((unsigned long) &init_thread_union) + THREAD_SIZE;
 405        lc->async_stack = (unsigned long)
 406                __alloc_bootmem(ASYNC_SIZE, ASYNC_SIZE, 0) + ASYNC_SIZE;
 407        lc->panic_stack = (unsigned long)
 408                __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0) + PAGE_SIZE;
 409        lc->current_task = (unsigned long) init_thread_union.thread_info.task;
 410        lc->thread_info = (unsigned long) &init_thread_union;
 411#ifndef CONFIG_64BIT
 412        if (MACHINE_HAS_IEEE) {
 413                lc->extended_save_area_addr = (__u32)
 414                        __alloc_bootmem(PAGE_SIZE, PAGE_SIZE, 0);
 415                /* enable extended save area */
 416                __ctl_set_bit(14, 29);
 417        }
 418#endif
 419        set_prefix((u32)(unsigned long) lc);
 420}
 421
 422static void __init
 423setup_resources(void)
 424{
 425        struct resource *res, *sub_res;
 426        int i;
 427
 428        code_resource.start = (unsigned long) &_text;
 429        code_resource.end = (unsigned long) &_etext - 1;
 430        data_resource.start = (unsigned long) &_etext;
 431        data_resource.end = (unsigned long) &_edata - 1;
 432
 433        for (i = 0; i < MEMORY_CHUNKS; i++) {
 434                if (!memory_chunk[i].size)
 435                        continue;
 436                res = alloc_bootmem_low(sizeof(struct resource));
 437                res->flags = IORESOURCE_BUSY | IORESOURCE_MEM;
 438                switch (memory_chunk[i].type) {
 439                case CHUNK_READ_WRITE:
 440                        res->name = "System RAM";
 441                        break;
 442                case CHUNK_READ_ONLY:
 443                        res->name = "System ROM";
 444                        res->flags |= IORESOURCE_READONLY;
 445                        break;
 446                default:
 447                        res->name = "reserved";
 448                }
 449                res->start = memory_chunk[i].addr;
 450                res->end = memory_chunk[i].addr +  memory_chunk[i].size - 1;
 451                request_resource(&iomem_resource, res);
 452
 453                if (code_resource.start >= res->start  &&
 454                        code_resource.start <= res->end &&
 455                        code_resource.end > res->end) {
 456                        sub_res = alloc_bootmem_low(sizeof(struct resource));
 457                        memcpy(sub_res, &code_resource,
 458                                sizeof(struct resource));
 459                        sub_res->end = res->end;
 460                        code_resource.start = res->end + 1;
 461                        request_resource(res, sub_res);
 462                }
 463
 464                if (code_resource.start >= res->start &&
 465                        code_resource.start <= res->end &&
 466                        code_resource.end <= res->end)
 467                        request_resource(res, &code_resource);
 468
 469                if (data_resource.start >= res->start &&
 470                        data_resource.start <= res->end &&
 471                        data_resource.end > res->end) {
 472                        sub_res = alloc_bootmem_low(sizeof(struct resource));
 473                        memcpy(sub_res, &data_resource,
 474                                sizeof(struct resource));
 475                        sub_res->end = res->end;
 476                        data_resource.start = res->end + 1;
 477                        request_resource(res, sub_res);
 478                }
 479
 480                if (data_resource.start >= res->start &&
 481                        data_resource.start <= res->end &&
 482                        data_resource.end <= res->end)
 483                        request_resource(res, &data_resource);
 484        }
 485}
 486
 487unsigned long real_memory_size;
 488EXPORT_SYMBOL_GPL(real_memory_size);
 489
 490static void __init setup_memory_end(void)
 491{
 492        unsigned long memory_size;
 493        unsigned long max_mem;
 494        int i;
 495
 496#if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_ZFCPDUMP_MODULE)
 497        if (ipl_info.type == IPL_TYPE_FCP_DUMP)
 498                memory_end = ZFCPDUMP_HSA_SIZE;
 499#endif
 500        memory_size = 0;
 501        memory_end &= PAGE_MASK;
 502
 503        max_mem = memory_end ? min(VMEM_MAX_PHYS, memory_end) : VMEM_MAX_PHYS;
 504        memory_end = min(max_mem, memory_end);
 505
 506        /*
 507         * Make sure all chunks are MAX_ORDER aligned so we don't need the
 508         * extra checks that HOLES_IN_ZONE would require.
 509         */
 510        for (i = 0; i < MEMORY_CHUNKS; i++) {
 511                unsigned long start, end;
 512                struct mem_chunk *chunk;
 513                unsigned long align;
 514
 515                chunk = &memory_chunk[i];
 516                align = 1UL << (MAX_ORDER + PAGE_SHIFT - 1);
 517                start = (chunk->addr + align - 1) & ~(align - 1);
 518                end = (chunk->addr + chunk->size) & ~(align - 1);
 519                if (start >= end)
 520                        memset(chunk, 0, sizeof(*chunk));
 521                else {
 522                        chunk->addr = start;
 523                        chunk->size = end - start;
 524                }
 525        }
 526
 527        for (i = 0; i < MEMORY_CHUNKS; i++) {
 528                struct mem_chunk *chunk = &memory_chunk[i];
 529
 530                real_memory_size = max(real_memory_size,
 531                                       chunk->addr + chunk->size);
 532                if (chunk->addr >= max_mem) {
 533                        memset(chunk, 0, sizeof(*chunk));
 534                        continue;
 535                }
 536                if (chunk->addr + chunk->size > max_mem)
 537                        chunk->size = max_mem - chunk->addr;
 538                memory_size = max(memory_size, chunk->addr + chunk->size);
 539        }
 540        if (!memory_end)
 541                memory_end = memory_size;
 542}
 543
 544static void __init
 545setup_memory(void)
 546{
 547        unsigned long bootmap_size;
 548        unsigned long start_pfn, end_pfn;
 549        int i;
 550
 551        /*
 552         * partially used pages are not usable - thus
 553         * we are rounding upwards:
 554         */
 555        start_pfn = PFN_UP(__pa(&_end));
 556        end_pfn = max_pfn = PFN_DOWN(memory_end);
 557
 558#ifdef CONFIG_BLK_DEV_INITRD
 559        /*
 560         * Move the initrd in case the bitmap of the bootmem allocater
 561         * would overwrite it.
 562         */
 563
 564        if (INITRD_START && INITRD_SIZE) {
 565                unsigned long bmap_size;
 566                unsigned long start;
 567
 568                bmap_size = bootmem_bootmap_pages(end_pfn - start_pfn + 1);
 569                bmap_size = PFN_PHYS(bmap_size);
 570
 571                if (PFN_PHYS(start_pfn) + bmap_size > INITRD_START) {
 572                        start = PFN_PHYS(start_pfn) + bmap_size + PAGE_SIZE;
 573
 574                        if (start + INITRD_SIZE > memory_end) {
 575                                printk("initrd extends beyond end of memory "
 576                                       "(0x%08lx > 0x%08lx)\n"
 577                                       "disabling initrd\n",
 578                                       start + INITRD_SIZE, memory_end);
 579                                INITRD_START = INITRD_SIZE = 0;
 580                        } else {
 581                                printk("Moving initrd (0x%08lx -> 0x%08lx, "
 582                                       "size: %ld)\n",
 583                                       INITRD_START, start, INITRD_SIZE);
 584                                memmove((void *) start, (void *) INITRD_START,
 585                                        INITRD_SIZE);
 586                                INITRD_START = start;
 587                        }
 588                }
 589        }
 590#endif
 591
 592        /*
 593         * Initialize the boot-time allocator
 594         */
 595        bootmap_size = init_bootmem(start_pfn, end_pfn);
 596
 597        /*
 598         * Register RAM areas with the bootmem allocator.
 599         */
 600
 601        for (i = 0; i < MEMORY_CHUNKS && memory_chunk[i].size > 0; i++) {
 602                unsigned long start_chunk, end_chunk, pfn;
 603
 604                if (memory_chunk[i].type != CHUNK_READ_WRITE)
 605                        continue;
 606                start_chunk = PFN_DOWN(memory_chunk[i].addr);
 607                end_chunk = start_chunk + PFN_DOWN(memory_chunk[i].size);
 608                end_chunk = min(end_chunk, end_pfn);
 609                if (start_chunk >= end_chunk)
 610                        continue;
 611                add_active_range(0, start_chunk, end_chunk);
 612                pfn = max(start_chunk, start_pfn);
 613                for (; pfn < end_chunk; pfn++)
 614                        page_set_storage_key(PFN_PHYS(pfn), PAGE_DEFAULT_KEY);
 615        }
 616
 617        psw_set_key(PAGE_DEFAULT_KEY);
 618
 619        free_bootmem_with_active_regions(0, max_pfn);
 620
 621        /*
 622         * Reserve memory used for lowcore/command line/kernel image.
 623         */
 624        reserve_bootmem(0, (unsigned long)_ehead, BOOTMEM_DEFAULT);
 625        reserve_bootmem((unsigned long)_stext,
 626                        PFN_PHYS(start_pfn) - (unsigned long)_stext,
 627                        BOOTMEM_DEFAULT);
 628        /*
 629         * Reserve the bootmem bitmap itself as well. We do this in two
 630         * steps (first step was init_bootmem()) because this catches
 631         * the (very unlikely) case of us accidentally initializing the
 632         * bootmem allocator with an invalid RAM area.
 633         */
 634        reserve_bootmem(start_pfn << PAGE_SHIFT, bootmap_size,
 635                        BOOTMEM_DEFAULT);
 636
 637#ifdef CONFIG_BLK_DEV_INITRD
 638        if (INITRD_START && INITRD_SIZE) {
 639                if (INITRD_START + INITRD_SIZE <= memory_end) {
 640                        reserve_bootmem(INITRD_START, INITRD_SIZE,
 641                                        BOOTMEM_DEFAULT);
 642                        initrd_start = INITRD_START;
 643                        initrd_end = initrd_start + INITRD_SIZE;
 644                } else {
 645                        printk("initrd extends beyond end of memory "
 646                               "(0x%08lx > 0x%08lx)\ndisabling initrd\n",
 647                               initrd_start + INITRD_SIZE, memory_end);
 648                        initrd_start = initrd_end = 0;
 649                }
 650        }
 651#endif
 652}
 653
 654static int __init __stfle(unsigned long long *list, int doublewords)
 655{
 656        typedef struct { unsigned long long _[doublewords]; } addrtype;
 657        register unsigned long __nr asm("0") = doublewords - 1;
 658
 659        asm volatile(".insn s,0xb2b00000,%0" /* stfle */
 660                     : "=m" (*(addrtype *) list), "+d" (__nr) : : "cc");
 661        return __nr + 1;
 662}
 663
 664int __init stfle(unsigned long long *list, int doublewords)
 665{
 666        if (!(stfl() & (1UL << 24)))
 667                return -EOPNOTSUPP;
 668        return __stfle(list, doublewords);
 669}
 670
 671/*
 672 * Setup hardware capabilities.
 673 */
 674static void __init setup_hwcaps(void)
 675{
 676        static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
 677        struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 678        unsigned long long facility_list_extended;
 679        unsigned int facility_list;
 680        int i;
 681
 682        facility_list = stfl();
 683        /*
 684         * The store facility list bits numbers as found in the principles
 685         * of operation are numbered with bit 1UL<<31 as number 0 to
 686         * bit 1UL<<0 as number 31.
 687         *   Bit 0: instructions named N3, "backported" to esa-mode
 688         *   Bit 2: z/Architecture mode is active
 689         *   Bit 7: the store-facility-list-extended facility is installed
 690         *   Bit 17: the message-security assist is installed
 691         *   Bit 19: the long-displacement facility is installed
 692         *   Bit 21: the extended-immediate facility is installed
 693         * These get translated to:
 694         *   HWCAP_S390_ESAN3 bit 0, HWCAP_S390_ZARCH bit 1,
 695         *   HWCAP_S390_STFLE bit 2, HWCAP_S390_MSA bit 3,
 696         *   HWCAP_S390_LDISP bit 4, and HWCAP_S390_EIMM bit 5.
 697         */
 698        for (i = 0; i < 6; i++)
 699                if (facility_list & (1UL << (31 - stfl_bits[i])))
 700                        elf_hwcap |= 1UL << i;
 701
 702        /*
 703         * Check for additional facilities with store-facility-list-extended.
 704         * stfle stores doublewords (8 byte) with bit 1ULL<<63 as bit 0
 705         * and 1ULL<<0 as bit 63. Bits 0-31 contain the same information
 706         * as stored by stfl, bits 32-xxx contain additional facilities.
 707         * How many facility words are stored depends on the number of
 708         * doublewords passed to the instruction. The additional facilites
 709         * are:
 710         *   Bit 43: decimal floating point facility is installed
 711         * translated to:
 712         *   HWCAP_S390_DFP bit 6.
 713         */
 714        if ((elf_hwcap & (1UL << 2)) &&
 715            __stfle(&facility_list_extended, 1) > 0) {
 716                if (facility_list_extended & (1ULL << (64 - 43)))
 717                        elf_hwcap |= 1UL << 6;
 718        }
 719
 720        if (MACHINE_HAS_HPAGE)
 721                elf_hwcap |= 1UL << 7;
 722
 723        switch (cpuinfo->cpu_id.machine) {
 724        case 0x9672:
 725#if !defined(CONFIG_64BIT)
 726        default:        /* Use "g5" as default for 31 bit kernels. */
 727#endif
 728                strcpy(elf_platform, "g5");
 729                break;
 730        case 0x2064:
 731        case 0x2066:
 732#if defined(CONFIG_64BIT)
 733        default:        /* Use "z900" as default for 64 bit kernels. */
 734#endif
 735                strcpy(elf_platform, "z900");
 736                break;
 737        case 0x2084:
 738        case 0x2086:
 739                strcpy(elf_platform, "z990");
 740                break;
 741        case 0x2094:
 742                strcpy(elf_platform, "z9-109");
 743                break;
 744        }
 745}
 746
 747/*
 748 * Setup function called from init/main.c just after the banner
 749 * was printed.
 750 */
 751
 752void __init
 753setup_arch(char **cmdline_p)
 754{
 755        /*
 756         * print what head.S has found out about the machine
 757         */
 758#ifndef CONFIG_64BIT
 759        printk((MACHINE_IS_VM) ?
 760               "We are running under VM (31 bit mode)\n" :
 761               "We are running native (31 bit mode)\n");
 762        printk((MACHINE_HAS_IEEE) ?
 763               "This machine has an IEEE fpu\n" :
 764               "This machine has no IEEE fpu\n");
 765#else /* CONFIG_64BIT */
 766        if (MACHINE_IS_VM)
 767                printk("We are running under VM (64 bit mode)\n");
 768        else if (MACHINE_IS_KVM) {
 769                printk("We are running under KVM (64 bit mode)\n");
 770                add_preferred_console("hvc", 0, NULL);
 771                s390_virtio_console_init();
 772        } else
 773                printk("We are running native (64 bit mode)\n");
 774#endif /* CONFIG_64BIT */
 775
 776        /* Have one command line that is parsed and saved in /proc/cmdline */
 777        /* boot_command_line has been already set up in early.c */
 778        *cmdline_p = boot_command_line;
 779
 780        ROOT_DEV = Root_RAM0;
 781
 782        init_mm.start_code = PAGE_OFFSET;
 783        init_mm.end_code = (unsigned long) &_etext;
 784        init_mm.end_data = (unsigned long) &_edata;
 785        init_mm.brk = (unsigned long) &_end;
 786
 787        if (MACHINE_HAS_MVCOS)
 788                memcpy(&uaccess, &uaccess_mvcos, sizeof(uaccess));
 789        else
 790                memcpy(&uaccess, &uaccess_std, sizeof(uaccess));
 791
 792        parse_early_param();
 793
 794        setup_ipl();
 795        setup_memory_end();
 796        setup_addressing_mode();
 797        setup_memory();
 798        setup_resources();
 799        setup_lowcore();
 800
 801        cpu_init();
 802        __cpu_logical_map[0] = S390_lowcore.cpu_data.cpu_addr;
 803        s390_init_cpu_topology();
 804
 805        /*
 806         * Setup capabilities (ELF_HWCAP & ELF_PLATFORM).
 807         */
 808        setup_hwcaps();
 809
 810        /*
 811         * Create kernel page tables and switch to virtual addressing.
 812         */
 813        paging_init();
 814
 815        /* Setup default console */
 816        conmode_default();
 817
 818        /* Setup zfcpdump support */
 819        setup_zfcpdump(console_devno);
 820}
 821
 822void __cpuinit print_cpu_info(struct cpuinfo_S390 *cpuinfo)
 823{
 824   printk(KERN_INFO "cpu %d "
 825#ifdef CONFIG_SMP
 826           "phys_idx=%d "
 827#endif
 828           "vers=%02X ident=%06X machine=%04X unused=%04X\n",
 829           cpuinfo->cpu_nr,
 830#ifdef CONFIG_SMP
 831           cpuinfo->cpu_addr,
 832#endif
 833           cpuinfo->cpu_id.version,
 834           cpuinfo->cpu_id.ident,
 835           cpuinfo->cpu_id.machine,
 836           cpuinfo->cpu_id.unused);
 837}
 838
 839/*
 840 * show_cpuinfo - Get information on one CPU for use by procfs.
 841 */
 842
 843static int show_cpuinfo(struct seq_file *m, void *v)
 844{
 845        static const char *hwcap_str[8] = {
 846                "esan3", "zarch", "stfle", "msa", "ldisp", "eimm", "dfp",
 847                "edat"
 848        };
 849        struct cpuinfo_S390 *cpuinfo;
 850        unsigned long n = (unsigned long) v - 1;
 851        int i;
 852
 853        s390_adjust_jiffies();
 854        preempt_disable();
 855        if (!n) {
 856                seq_printf(m, "vendor_id       : IBM/S390\n"
 857                               "# processors    : %i\n"
 858                               "bogomips per cpu: %lu.%02lu\n",
 859                               num_online_cpus(), loops_per_jiffy/(500000/HZ),
 860                               (loops_per_jiffy/(5000/HZ))%100);
 861                seq_puts(m, "features\t: ");
 862                for (i = 0; i < 8; i++)
 863                        if (hwcap_str[i] && (elf_hwcap & (1UL << i)))
 864                                seq_printf(m, "%s ", hwcap_str[i]);
 865                seq_puts(m, "\n");
 866        }
 867
 868        if (cpu_online(n)) {
 869#ifdef CONFIG_SMP
 870                if (smp_processor_id() == n)
 871                        cpuinfo = &S390_lowcore.cpu_data;
 872                else
 873                        cpuinfo = &lowcore_ptr[n]->cpu_data;
 874#else
 875                cpuinfo = &S390_lowcore.cpu_data;
 876#endif
 877                seq_printf(m, "processor %li: "
 878                               "version = %02X,  "
 879                               "identification = %06X,  "
 880                               "machine = %04X\n",
 881                               n, cpuinfo->cpu_id.version,
 882                               cpuinfo->cpu_id.ident,
 883                               cpuinfo->cpu_id.machine);
 884        }
 885        preempt_enable();
 886        return 0;
 887}
 888
 889static void *c_start(struct seq_file *m, loff_t *pos)
 890{
 891        return *pos < NR_CPUS ? (void *)((unsigned long) *pos + 1) : NULL;
 892}
 893static void *c_next(struct seq_file *m, void *v, loff_t *pos)
 894{
 895        ++*pos;
 896        return c_start(m, pos);
 897}
 898static void c_stop(struct seq_file *m, void *v)
 899{
 900}
 901const struct seq_operations cpuinfo_op = {
 902        .start  = c_start,
 903        .next   = c_next,
 904        .stop   = c_stop,
 905        .show   = show_cpuinfo,
 906};
 907
 908