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   1 /*
   2  *  arch/s390/kernel/ipl.c
   3  *    ipl/reipl/dump support for Linux on s390.
   4  *
   5  *    Copyright IBM Corp. 2005,2007
   6  *    Author(s): Michael Holzheu <holzheu@de.ibm.com>
   7  *               Heiko Carstens <heiko.carstens@de.ibm.com>
   8  *               Volker Sameske <sameske@de.ibm.com>
   9  */
  10
  11 #include <linux/types.h>
  12 #include <linux/module.h>
  13 #include <linux/device.h>
  14 #include <linux/delay.h>
  15 #include <linux/reboot.h>
  16 #include <linux/ctype.h>
  17 #include <linux/fs.h>
  18 #include <asm/ipl.h>
  19 #include <asm/smp.h>
  20 #include <asm/setup.h>
  21 #include <asm/cpcmd.h>
  22 #include <asm/cio.h>
  23 #include <asm/ebcdic.h>
  24 #include <asm/reset.h>
  25 #include <asm/sclp.h>
  26 #include <asm/setup.h>
  27
  28 #define IPL_PARM_BLOCK_VERSION 0
  29
  30 #define IPL_UNKNOWN_STR         "unknown"
  31 #define IPL_CCW_STR             "ccw"
  32 #define IPL_FCP_STR             "fcp"
  33 #define IPL_FCP_DUMP_STR        "fcp_dump"
  34 #define IPL_NSS_STR             "nss"
  35
  36 #define DUMP_CCW_STR            "ccw"
  37 #define DUMP_FCP_STR            "fcp"
  38 #define DUMP_NONE_STR           "none"
  39
  40 /*
  41  * Four shutdown trigger types are supported:
  42  * - panic
  43  * - halt
  44  * - power off
  45  * - reipl
  46  */
  47 #define ON_PANIC_STR            "on_panic"
  48 #define ON_HALT_STR             "on_halt"
  49 #define ON_POFF_STR             "on_poff"
  50 #define ON_REIPL_STR            "on_reboot"
  51
  52 struct shutdown_action;
  53 struct shutdown_trigger {
  54         char *name;
  55         struct shutdown_action *action;
  56 };
  57
  58 /*
  59  * Five shutdown action types are supported:
  60  */
  61 #define SHUTDOWN_ACTION_IPL_STR         "ipl"
  62 #define SHUTDOWN_ACTION_REIPL_STR       "reipl"
  63 #define SHUTDOWN_ACTION_DUMP_STR        "dump"
  64 #define SHUTDOWN_ACTION_VMCMD_STR       "vmcmd"
  65 #define SHUTDOWN_ACTION_STOP_STR        "stop"
  66
  67 struct shutdown_action {
  68         char *name;
  69         void (*fn) (struct shutdown_trigger *trigger);
  70         int (*init) (void);
  71 };
  72
  73 static char *ipl_type_str(enum ipl_type type)
  74 {
  75         switch (type) {
  76         case IPL_TYPE_CCW:
  77                 return IPL_CCW_STR;
  78         case IPL_TYPE_FCP:
  79                 return IPL_FCP_STR;
  80         case IPL_TYPE_FCP_DUMP:
  81                 return IPL_FCP_DUMP_STR;
  82         case IPL_TYPE_NSS:
  83                 return IPL_NSS_STR;
  84         case IPL_TYPE_UNKNOWN:
  85         default:
  86                 return IPL_UNKNOWN_STR;
  87         }
  88 }
  89
  90 enum dump_type {
  91         DUMP_TYPE_NONE  = 1,
  92         DUMP_TYPE_CCW   = 2,
  93         DUMP_TYPE_FCP   = 4,
  94 };
  95
  96 static char *dump_type_str(enum dump_type type)
  97 {
  98         switch (type) {
  99         case DUMP_TYPE_NONE:
 100                 return DUMP_NONE_STR;
 101         case DUMP_TYPE_CCW:
 102                 return DUMP_CCW_STR;
 103         case DUMP_TYPE_FCP:
 104                 return DUMP_FCP_STR;
 105         default:
 106                 return NULL;
 107         }
 108 }
 109
 110 /*
 111  * Must be in data section since the bss section
 112  * is not cleared when these are accessed.
 113  */
 114 static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
 115 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
 116
 117 enum ipl_method {
 118         REIPL_METHOD_CCW_CIO,
 119         REIPL_METHOD_CCW_DIAG,
 120         REIPL_METHOD_CCW_VM,
 121         REIPL_METHOD_FCP_RO_DIAG,
 122         REIPL_METHOD_FCP_RW_DIAG,
 123         REIPL_METHOD_FCP_RO_VM,
 124         REIPL_METHOD_FCP_DUMP,
 125         REIPL_METHOD_NSS,
 126         REIPL_METHOD_NSS_DIAG,
 127         REIPL_METHOD_DEFAULT,
 128 };
 129
 130 enum dump_method {
 131         DUMP_METHOD_NONE,
 132         DUMP_METHOD_CCW_CIO,
 133         DUMP_METHOD_CCW_DIAG,
 134         DUMP_METHOD_CCW_VM,
 135         DUMP_METHOD_FCP_DIAG,
 136 };
 137
 138 static int diag308_set_works = 0;
 139
 140 static struct ipl_parameter_block ipl_block;
 141
 142 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
 143
 144 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
 145 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
 146 static struct ipl_parameter_block *reipl_block_fcp;
 147 static struct ipl_parameter_block *reipl_block_ccw;
 148 static struct ipl_parameter_block *reipl_block_nss;
 149
 150 static int dump_capabilities = DUMP_TYPE_NONE;
 151 static enum dump_type dump_type = DUMP_TYPE_NONE;
 152 static enum dump_method dump_method = DUMP_METHOD_NONE;
 153 static struct ipl_parameter_block *dump_block_fcp;
 154 static struct ipl_parameter_block *dump_block_ccw;
 155
 156 static struct sclp_ipl_info sclp_ipl_info;
 157
 158 int diag308(unsigned long subcode, void *addr)
 159 {
 160         register unsigned long _addr asm("0") = (unsigned long) addr;
 161         register unsigned long _rc asm("1") = 0;
 162
 163         asm volatile(
 164                 "       diag    %0,%2,0x308\n"
 165                 "0:\n"
 166                 EX_TABLE(0b,0b)
 167                 : "+d" (_addr), "+d" (_rc)
 168                 : "d" (subcode) : "cc", "memory");
 169         return _rc;
 170 }
 171 EXPORT_SYMBOL_GPL(diag308);
 172
 173 /* SYSFS */
 174
 175 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
 176 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 177                 struct kobj_attribute *attr,                            \
 178                 char *page)                                             \
 179 {                                                                       \
 180         return sprintf(page, _format, _value);                          \
 181 }                                                                       \
 182 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 183         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
 184
 185 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
 186 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 187                 struct kobj_attribute *attr,                            \
 188                 char *page)                                             \
 189 {                                                                       \
 190         return sprintf(page, _fmt_out,                                  \
 191                         (unsigned long long) _value);                   \
 192 }                                                                       \
 193 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
 194                 struct kobj_attribute *attr,                            \
 195                 const char *buf, size_t len)                            \
 196 {                                                                       \
 197         unsigned long long value;                                       \
 198         if (sscanf(buf, _fmt_in, &value) != 1)                          \
 199                 return -EINVAL;                                         \
 200         _value = value;                                                 \
 201         return len;                                                     \
 202 }                                                                       \
 203 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 204         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 205                         sys_##_prefix##_##_name##_show,                 \
 206                         sys_##_prefix##_##_name##_store);
 207
 208 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
 209 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 210                 struct kobj_attribute *attr,                            \
 211                 char *page)                                             \
 212 {                                                                       \
 213         return sprintf(page, _fmt_out, _value);                         \
 214 }                                                                       \
 215 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
 216                 struct kobj_attribute *attr,                            \
 217                 const char *buf, size_t len)                            \
 218 {                                                                       \
 219         strncpy(_value, buf, sizeof(_value) - 1);                       \
 220         strstrip(_value);                                               \
 221         return len;                                                     \
 222 }                                                                       \
 223 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 224         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 225                         sys_##_prefix##_##_name##_show,                 \
 226                         sys_##_prefix##_##_name##_store);
 227
 228 static void make_attrs_ro(struct attribute **attrs)
 229 {
 230         while (*attrs) {
 231                 (*attrs)->mode = S_IRUGO;
 232                 attrs++;
 233         }
 234 }
 235
 236 /*
 237  * ipl section
 238  */
 239
 240 static __init enum ipl_type get_ipl_type(void)
 241 {
 242         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 243
 244         if (ipl_flags & IPL_NSS_VALID)
 245                 return IPL_TYPE_NSS;
 246         if (!(ipl_flags & IPL_DEVNO_VALID))
 247                 return IPL_TYPE_UNKNOWN;
 248         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
 249                 return IPL_TYPE_CCW;
 250         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
 251                 return IPL_TYPE_UNKNOWN;
 252         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
 253                 return IPL_TYPE_UNKNOWN;
 254         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
 255                 return IPL_TYPE_FCP_DUMP;
 256         return IPL_TYPE_FCP;
 257 }
 258
 259 struct ipl_info ipl_info;
 260 EXPORT_SYMBOL_GPL(ipl_info);
 261
 262 static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
 263                              char *page)
 264 {
 265         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
 266 }
 267
 268 static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
 269
 270 /* VM IPL PARM routines */
 271 static void reipl_get_ascii_vmparm(char *dest,
 272                                    const struct ipl_parameter_block *ipb)
 273 {
 274         int i;
 275         int len = 0;
 276         char has_lowercase = 0;
 277
 278         if ((ipb->ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID) &&
 279             (ipb->ipl_info.ccw.vm_parm_len > 0)) {
 280
 281                 len = ipb->ipl_info.ccw.vm_parm_len;
 282                 memcpy(dest, ipb->ipl_info.ccw.vm_parm, len);
 283                 /* If at least one character is lowercase, we assume mixed
 284                  * case; otherwise we convert everything to lowercase.
 285                  */
 286                 for (i = 0; i < len; i++)
 287                         if ((dest[i] > 0x80 && dest[i] < 0x8a) || /* a-i */
 288                             (dest[i] > 0x90 && dest[i] < 0x9a) || /* j-r */
 289                             (dest[i] > 0xa1 && dest[i] < 0xaa)) { /* s-z */
 290                                 has_lowercase = 1;
 291                                 break;
 292                         }
 293                 if (!has_lowercase)
 294                         EBC_TOLOWER(dest, len);
 295                 EBCASC(dest, len);
 296         }
 297         dest[len] = 0;
 298 }
 299
 300 void get_ipl_vmparm(char *dest)
 301 {
 302         if (diag308_set_works && (ipl_block.hdr.pbt == DIAG308_IPL_TYPE_CCW))
 303                 reipl_get_ascii_vmparm(dest, &ipl_block);
 304         else
 305                 dest[0] = 0;
 306 }
 307
 308 static ssize_t ipl_vm_parm_show(struct kobject *kobj,
 309                                 struct kobj_attribute *attr, char *page)
 310 {
 311         char parm[DIAG308_VMPARM_SIZE + 1] = {};
 312
 313         get_ipl_vmparm(parm);
 314         return sprintf(page, "%s\n", parm);
 315 }
 316
 317 static struct kobj_attribute sys_ipl_vm_parm_attr =
 318         __ATTR(parm, S_IRUGO, ipl_vm_parm_show, NULL);
 319
 320 static ssize_t sys_ipl_device_show(struct kobject *kobj,
 321                                    struct kobj_attribute *attr, char *page)
 322 {
 323         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 324
 325         switch (ipl_info.type) {
 326         case IPL_TYPE_CCW:
 327                 return sprintf(page, "0.0.%04x\n", ipl_devno);
 328         case IPL_TYPE_FCP:
 329         case IPL_TYPE_FCP_DUMP:
 330                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
 331         default:
 332                 return 0;
 333         }
 334 }
 335
 336 static struct kobj_attribute sys_ipl_device_attr =
 337         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
 338
 339 static ssize_t ipl_parameter_read(struct kobject *kobj, struct bin_attribute *attr,
 340                                   char *buf, loff_t off, size_t count)
 341 {
 342         return memory_read_from_buffer(buf, count, &off, IPL_PARMBLOCK_START,
 343                                         IPL_PARMBLOCK_SIZE);
 344 }
 345
 346 static struct bin_attribute ipl_parameter_attr = {
 347         .attr = {
 348                 .name = "binary_parameter",
 349                 .mode = S_IRUGO,
 350         },
 351         .size = PAGE_SIZE,
 352         .read = &ipl_parameter_read,
 353 };
 354
 355 static ssize_t ipl_scp_data_read(struct kobject *kobj, struct bin_attribute *attr,
 356                                  char *buf, loff_t off, size_t count)
 357 {
 358         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
 359         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
 360
 361         return memory_read_from_buffer(buf, count, &off, scp_data, size);
 362 }
 363
 364 static struct bin_attribute ipl_scp_data_attr = {
 365         .attr = {
 366                 .name = "scp_data",
 367                 .mode = S_IRUGO,
 368         },
 369         .size = PAGE_SIZE,
 370         .read = ipl_scp_data_read,
 371 };
 372
 373 /* FCP ipl device attributes */
 374
 375 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
 376                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
 377 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
 378                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
 379 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
 380                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
 381 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
 382                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
 383
 384 static struct attribute *ipl_fcp_attrs[] = {
 385         &sys_ipl_type_attr.attr,
 386         &sys_ipl_device_attr.attr,
 387         &sys_ipl_fcp_wwpn_attr.attr,
 388         &sys_ipl_fcp_lun_attr.attr,
 389         &sys_ipl_fcp_bootprog_attr.attr,
 390         &sys_ipl_fcp_br_lba_attr.attr,
 391         NULL,
 392 };
 393
 394 static struct attribute_group ipl_fcp_attr_group = {
 395         .attrs = ipl_fcp_attrs,
 396 };
 397
 398 /* CCW ipl device attributes */
 399
 400 static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
 401                                      struct kobj_attribute *attr, char *page)
 402 {
 403         char loadparm[LOADPARM_LEN + 1] = {};
 404
 405         if (!sclp_ipl_info.is_valid)
 406                 return sprintf(page, "#unknown#\n");
 407         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
 408         EBCASC(loadparm, LOADPARM_LEN);
 409         strstrip(loadparm);
 410         return sprintf(page, "%s\n", loadparm);
 411 }
 412
 413 static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
 414         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
 415
 416 static struct attribute *ipl_ccw_attrs_vm[] = {
 417         &sys_ipl_type_attr.attr,
 418         &sys_ipl_device_attr.attr,
 419         &sys_ipl_ccw_loadparm_attr.attr,
 420         &sys_ipl_vm_parm_attr.attr,
 421         NULL,
 422 };
 423
 424 static struct attribute *ipl_ccw_attrs_lpar[] = {
 425         &sys_ipl_type_attr.attr,
 426         &sys_ipl_device_attr.attr,
 427         &sys_ipl_ccw_loadparm_attr.attr,
 428         NULL,
 429 };
 430
 431 static struct attribute_group ipl_ccw_attr_group_vm = {
 432         .attrs = ipl_ccw_attrs_vm,
 433 };
 434
 435 static struct attribute_group ipl_ccw_attr_group_lpar = {
 436         .attrs = ipl_ccw_attrs_lpar
 437 };
 438
 439 /* NSS ipl device attributes */
 440
 441 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
 442
 443 static struct attribute *ipl_nss_attrs[] = {
 444         &sys_ipl_type_attr.attr,
 445         &sys_ipl_nss_name_attr.attr,
 446         &sys_ipl_ccw_loadparm_attr.attr,
 447         &sys_ipl_vm_parm_attr.attr,
 448         NULL,
 449 };
 450
 451 static struct attribute_group ipl_nss_attr_group = {
 452         .attrs = ipl_nss_attrs,
 453 };
 454
 455 /* UNKNOWN ipl device attributes */
 456
 457 static struct attribute *ipl_unknown_attrs[] = {
 458         &sys_ipl_type_attr.attr,
 459         NULL,
 460 };
 461
 462 static struct attribute_group ipl_unknown_attr_group = {
 463         .attrs = ipl_unknown_attrs,
 464 };
 465
 466 static struct kset *ipl_kset;
 467
 468 static int __init ipl_register_fcp_files(void)
 469 {
 470         int rc;
 471
 472         rc = sysfs_create_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
 473         if (rc)
 474                 goto out;
 475         rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
 476         if (rc)
 477                 goto out_ipl_parm;
 478         rc = sysfs_create_bin_file(&ipl_kset->kobj, &ipl_scp_data_attr);
 479         if (!rc)
 480                 goto out;
 481
 482         sysfs_remove_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
 483
 484 out_ipl_parm:
 485         sysfs_remove_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
 486 out:
 487         return rc;
 488 }
 489
 490 static void ipl_run(struct shutdown_trigger *trigger)
 491 {
 492         diag308(DIAG308_IPL, NULL);
 493         if (MACHINE_IS_VM)
 494                 __cpcmd("IPL", NULL, 0, NULL);
 495         else if (ipl_info.type == IPL_TYPE_CCW)
 496                 reipl_ccw_dev(&ipl_info.data.ccw.dev_id);
 497 }
 498
 499 static int __init ipl_init(void)
 500 {
 501         int rc;
 502
 503         ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
 504         if (!ipl_kset) {
 505                 rc = -ENOMEM;
 506                 goto out;
 507         }
 508         switch (ipl_info.type) {
 509         case IPL_TYPE_CCW:
 510                 if (MACHINE_IS_VM)
 511                         rc = sysfs_create_group(&ipl_kset->kobj,
 512                                                 &ipl_ccw_attr_group_vm);
 513                 else
 514                         rc = sysfs_create_group(&ipl_kset->kobj,
 515                                                 &ipl_ccw_attr_group_lpar);
 516                 break;
 517         case IPL_TYPE_FCP:
 518         case IPL_TYPE_FCP_DUMP:
 519                 rc = ipl_register_fcp_files();
 520                 break;
 521         case IPL_TYPE_NSS:
 522                 rc = sysfs_create_group(&ipl_kset->kobj, &ipl_nss_attr_group);
 523                 break;
 524         default:
 525                 rc = sysfs_create_group(&ipl_kset->kobj,
 526                                         &ipl_unknown_attr_group);
 527                 break;
 528         }
 529 out:
 530         if (rc)
 531                 panic("ipl_init failed: rc = %i\n", rc);
 532
 533         return 0;
 534 }
 535
 536 static struct shutdown_action __refdata ipl_action = {
 537         .name   = SHUTDOWN_ACTION_IPL_STR,
 538         .fn     = ipl_run,
 539         .init   = ipl_init,
 540 };
 541
 542 /*
 543  * reipl shutdown action: Reboot Linux on shutdown.
 544  */
 545
 546 /* VM IPL PARM attributes */
 547 static ssize_t reipl_generic_vmparm_show(struct ipl_parameter_block *ipb,
 548                                           char *page)
 549 {
 550         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
 551
 552         reipl_get_ascii_vmparm(vmparm, ipb);
 553         return sprintf(page, "%s\n", vmparm);
 554 }
 555
 556 static ssize_t reipl_generic_vmparm_store(struct ipl_parameter_block *ipb,
 557                                           size_t vmparm_max,
 558                                           const char *buf, size_t len)
 559 {
 560         int i, ip_len;
 561
 562         /* ignore trailing newline */
 563         ip_len = len;
 564         if ((len > 0) && (buf[len - 1] == '\n'))
 565                 ip_len--;
 566
 567         if (ip_len > vmparm_max)
 568                 return -EINVAL;
 569
 570         /* parm is used to store kernel options, check for common chars */
 571         for (i = 0; i < ip_len; i++)
 572                 if (!(isalnum(buf[i]) || isascii(buf[i]) || isprint(buf[i])))
 573                         return -EINVAL;
 574
 575         memset(ipb->ipl_info.ccw.vm_parm, 0, DIAG308_VMPARM_SIZE);
 576         ipb->ipl_info.ccw.vm_parm_len = ip_len;
 577         if (ip_len > 0) {
 578                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
 579                 memcpy(ipb->ipl_info.ccw.vm_parm, buf, ip_len);
 580                 ASCEBC(ipb->ipl_info.ccw.vm_parm, ip_len);
 581         } else {
 582                 ipb->ipl_info.ccw.vm_flags &= ~DIAG308_VM_FLAGS_VP_VALID;
 583         }
 584
 585         return len;
 586 }
 587
 588 /* NSS wrapper */
 589 static ssize_t reipl_nss_vmparm_show(struct kobject *kobj,
 590                                      struct kobj_attribute *attr, char *page)
 591 {
 592         return reipl_generic_vmparm_show(reipl_block_nss, page);
 593 }
 594
 595 static ssize_t reipl_nss_vmparm_store(struct kobject *kobj,
 596                                       struct kobj_attribute *attr,
 597                                       const char *buf, size_t len)
 598 {
 599         return reipl_generic_vmparm_store(reipl_block_nss, 56, buf, len);
 600 }
 601
 602 /* CCW wrapper */
 603 static ssize_t reipl_ccw_vmparm_show(struct kobject *kobj,
 604                                      struct kobj_attribute *attr, char *page)
 605 {
 606         return reipl_generic_vmparm_show(reipl_block_ccw, page);
 607 }
 608
 609 static ssize_t reipl_ccw_vmparm_store(struct kobject *kobj,
 610                                       struct kobj_attribute *attr,
 611                                       const char *buf, size_t len)
 612 {
 613         return reipl_generic_vmparm_store(reipl_block_ccw, 64, buf, len);
 614 }
 615
 616 static struct kobj_attribute sys_reipl_nss_vmparm_attr =
 617         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_nss_vmparm_show,
 618                                         reipl_nss_vmparm_store);
 619 static struct kobj_attribute sys_reipl_ccw_vmparm_attr =
 620         __ATTR(parm, S_IRUGO | S_IWUSR, reipl_ccw_vmparm_show,
 621                                         reipl_ccw_vmparm_store);
 622
 623 /* FCP reipl device attributes */
 624
 625 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
 626                    reipl_block_fcp->ipl_info.fcp.wwpn);
 627 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
 628                    reipl_block_fcp->ipl_info.fcp.lun);
 629 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
 630                    reipl_block_fcp->ipl_info.fcp.bootprog);
 631 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
 632                    reipl_block_fcp->ipl_info.fcp.br_lba);
 633 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 634                    reipl_block_fcp->ipl_info.fcp.devno);
 635
 636 static struct attribute *reipl_fcp_attrs[] = {
 637         &sys_reipl_fcp_device_attr.attr,
 638         &sys_reipl_fcp_wwpn_attr.attr,
 639         &sys_reipl_fcp_lun_attr.attr,
 640         &sys_reipl_fcp_bootprog_attr.attr,
 641         &sys_reipl_fcp_br_lba_attr.attr,
 642         NULL,
 643 };
 644
 645 static struct attribute_group reipl_fcp_attr_group = {
 646         .name  = IPL_FCP_STR,
 647         .attrs = reipl_fcp_attrs,
 648 };
 649
 650 /* CCW reipl device attributes */
 651
 652 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
 653         reipl_block_ccw->ipl_info.ccw.devno);
 654
 655 static void reipl_get_ascii_loadparm(char *loadparm,
 656                                      struct ipl_parameter_block *ibp)
 657 {
 658         memcpy(loadparm, ibp->ipl_info.ccw.load_parm, LOADPARM_LEN);
 659         EBCASC(loadparm, LOADPARM_LEN);
 660         loadparm[LOADPARM_LEN] = 0;
 661         strstrip(loadparm);
 662 }
 663
 664 static ssize_t reipl_generic_loadparm_show(struct ipl_parameter_block *ipb,
 665                                            char *page)
 666 {
 667         char buf[LOADPARM_LEN + 1];
 668
 669         reipl_get_ascii_loadparm(buf, ipb);
 670         return sprintf(page, "%s\n", buf);
 671 }
 672
 673 static ssize_t reipl_generic_loadparm_store(struct ipl_parameter_block *ipb,
 674                                             const char *buf, size_t len)
 675 {
 676         int i, lp_len;
 677
 678         /* ignore trailing newline */
 679         lp_len = len;
 680         if ((len > 0) && (buf[len - 1] == '\n'))
 681                 lp_len--;
 682         /* loadparm can have max 8 characters and must not start with a blank */
 683         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
 684                 return -EINVAL;
 685         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
 686         for (i = 0; i < lp_len; i++) {
 687                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
 688                     (buf[i] == '.'))
 689                         continue;
 690                 return -EINVAL;
 691         }
 692         /* initialize loadparm with blanks */
 693         memset(ipb->ipl_info.ccw.load_parm, ' ', LOADPARM_LEN);
 694         /* copy and convert to ebcdic */
 695         memcpy(ipb->ipl_info.ccw.load_parm, buf, lp_len);
 696         ASCEBC(ipb->ipl_info.ccw.load_parm, LOADPARM_LEN);
 697         return len;
 698 }
 699
 700 /* NSS wrapper */
 701 static ssize_t reipl_nss_loadparm_show(struct kobject *kobj,
 702                                        struct kobj_attribute *attr, char *page)
 703 {
 704         return reipl_generic_loadparm_show(reipl_block_nss, page);
 705 }
 706
 707 static ssize_t reipl_nss_loadparm_store(struct kobject *kobj,
 708                                         struct kobj_attribute *attr,
 709                                         const char *buf, size_t len)
 710 {
 711         return reipl_generic_loadparm_store(reipl_block_nss, buf, len);
 712 }
 713
 714 /* CCW wrapper */
 715 static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
 716                                        struct kobj_attribute *attr, char *page)
 717 {
 718         return reipl_generic_loadparm_show(reipl_block_ccw, page);
 719 }
 720
 721 static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
 722                                         struct kobj_attribute *attr,
 723                                         const char *buf, size_t len)
 724 {
 725         return reipl_generic_loadparm_store(reipl_block_ccw, buf, len);
 726 }
 727
 728 static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
 729         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_ccw_loadparm_show,
 730                                             reipl_ccw_loadparm_store);
 731
 732 static struct attribute *reipl_ccw_attrs_vm[] = {
 733         &sys_reipl_ccw_device_attr.attr,
 734         &sys_reipl_ccw_loadparm_attr.attr,
 735         &sys_reipl_ccw_vmparm_attr.attr,
 736         NULL,
 737 };
 738
 739 static struct attribute *reipl_ccw_attrs_lpar[] = {
 740         &sys_reipl_ccw_device_attr.attr,
 741         &sys_reipl_ccw_loadparm_attr.attr,
 742         NULL,
 743 };
 744
 745 static struct attribute_group reipl_ccw_attr_group_vm = {
 746         .name  = IPL_CCW_STR,
 747         .attrs = reipl_ccw_attrs_vm,
 748 };
 749
 750 static struct attribute_group reipl_ccw_attr_group_lpar = {
 751         .name  = IPL_CCW_STR,
 752         .attrs = reipl_ccw_attrs_lpar,
 753 };
 754
 755
 756 /* NSS reipl device attributes */
 757 static void reipl_get_ascii_nss_name(char *dst,
 758                                      struct ipl_parameter_block *ipb)
 759 {
 760         memcpy(dst, ipb->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
 761         EBCASC(dst, NSS_NAME_SIZE);
 762         dst[NSS_NAME_SIZE] = 0;
 763 }
 764
 765 static ssize_t reipl_nss_name_show(struct kobject *kobj,
 766                                    struct kobj_attribute *attr, char *page)
 767 {
 768         char nss_name[NSS_NAME_SIZE + 1] = {};
 769
 770         reipl_get_ascii_nss_name(nss_name, reipl_block_nss);
 771         return sprintf(page, "%s\n", nss_name);
 772 }
 773
 774 static ssize_t reipl_nss_name_store(struct kobject *kobj,
 775                                     struct kobj_attribute *attr,
 776                                     const char *buf, size_t len)
 777 {
 778         int nss_len;
 779
 780         /* ignore trailing newline */
 781         nss_len = len;
 782         if ((len > 0) && (buf[len - 1] == '\n'))
 783                 nss_len--;
 784
 785         if (nss_len > NSS_NAME_SIZE)
 786                 return -EINVAL;
 787
 788         memset(reipl_block_nss->ipl_info.ccw.nss_name, 0x40, NSS_NAME_SIZE);
 789         if (nss_len > 0) {
 790                 reipl_block_nss->ipl_info.ccw.vm_flags |=
 791                         DIAG308_VM_FLAGS_NSS_VALID;
 792                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name, buf, nss_len);
 793                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
 794                 EBC_TOUPPER(reipl_block_nss->ipl_info.ccw.nss_name, nss_len);
 795         } else {
 796                 reipl_block_nss->ipl_info.ccw.vm_flags &=
 797                         ~DIAG308_VM_FLAGS_NSS_VALID;
 798         }
 799
 800         return len;
 801 }
 802
 803 static struct kobj_attribute sys_reipl_nss_name_attr =
 804         __ATTR(name, S_IRUGO | S_IWUSR, reipl_nss_name_show,
 805                                         reipl_nss_name_store);
 806
 807 static struct kobj_attribute sys_reipl_nss_loadparm_attr =
 808         __ATTR(loadparm, S_IRUGO | S_IWUSR, reipl_nss_loadparm_show,
 809                                             reipl_nss_loadparm_store);
 810
 811 static struct attribute *reipl_nss_attrs[] = {
 812         &sys_reipl_nss_name_attr.attr,
 813         &sys_reipl_nss_loadparm_attr.attr,
 814         &sys_reipl_nss_vmparm_attr.attr,
 815         NULL,
 816 };
 817
 818 static struct attribute_group reipl_nss_attr_group = {
 819         .name  = IPL_NSS_STR,
 820         .attrs = reipl_nss_attrs,
 821 };
 822
 823 /* reipl type */
 824
 825 static int reipl_set_type(enum ipl_type type)
 826 {
 827         if (!(reipl_capabilities & type))
 828                 return -EINVAL;
 829
 830         switch(type) {
 831         case IPL_TYPE_CCW:
 832                 if (diag308_set_works)
 833                         reipl_method = REIPL_METHOD_CCW_DIAG;
 834                 else if (MACHINE_IS_VM)
 835                         reipl_method = REIPL_METHOD_CCW_VM;
 836                 else
 837                         reipl_method = REIPL_METHOD_CCW_CIO;
 838                 break;
 839         case IPL_TYPE_FCP:
 840                 if (diag308_set_works)
 841                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
 842                 else if (MACHINE_IS_VM)
 843                         reipl_method = REIPL_METHOD_FCP_RO_VM;
 844                 else
 845                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
 846                 break;
 847         case IPL_TYPE_FCP_DUMP:
 848                 reipl_method = REIPL_METHOD_FCP_DUMP;
 849                 break;
 850         case IPL_TYPE_NSS:
 851                 if (diag308_set_works)
 852                         reipl_method = REIPL_METHOD_NSS_DIAG;
 853                 else
 854                         reipl_method = REIPL_METHOD_NSS;
 855                 break;
 856         case IPL_TYPE_UNKNOWN:
 857                 reipl_method = REIPL_METHOD_DEFAULT;
 858                 break;
 859         default:
 860                 BUG();
 861         }
 862         reipl_type = type;
 863         return 0;
 864 }
 865
 866 static ssize_t reipl_type_show(struct kobject *kobj,
 867                                struct kobj_attribute *attr, char *page)
 868 {
 869         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
 870 }
 871
 872 static ssize_t reipl_type_store(struct kobject *kobj,
 873                                 struct kobj_attribute *attr,
 874                                 const char *buf, size_t len)
 875 {
 876         int rc = -EINVAL;
 877
 878         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
 879                 rc = reipl_set_type(IPL_TYPE_CCW);
 880         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
 881                 rc = reipl_set_type(IPL_TYPE_FCP);
 882         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
 883                 rc = reipl_set_type(IPL_TYPE_NSS);
 884         return (rc != 0) ? rc : len;
 885 }
 886
 887 static struct kobj_attribute reipl_type_attr =
 888         __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
 889
 890 static struct kset *reipl_kset;
 891
 892 static void get_ipl_string(char *dst, struct ipl_parameter_block *ipb,
 893                            const enum ipl_method m)
 894 {
 895         char loadparm[LOADPARM_LEN + 1] = {};
 896         char vmparm[DIAG308_VMPARM_SIZE + 1] = {};
 897         char nss_name[NSS_NAME_SIZE + 1] = {};
 898         size_t pos = 0;
 899
 900         reipl_get_ascii_loadparm(loadparm, ipb);
 901         reipl_get_ascii_nss_name(nss_name, ipb);
 902         reipl_get_ascii_vmparm(vmparm, ipb);
 903
 904         switch (m) {
 905         case REIPL_METHOD_CCW_VM:
 906                 pos = sprintf(dst, "IPL %X CLEAR", ipb->ipl_info.ccw.devno);
 907                 break;
 908         case REIPL_METHOD_NSS:
 909                 pos = sprintf(dst, "IPL %s", nss_name);
 910                 break;
 911         default:
 912                 break;
 913         }
 914         if (strlen(loadparm) > 0)
 915                 pos += sprintf(dst + pos, " LOADPARM '%s'", loadparm);
 916         if (strlen(vmparm) > 0)
 917                 sprintf(dst + pos, " PARM %s", vmparm);
 918 }
 919
 920 static void reipl_run(struct shutdown_trigger *trigger)
 921 {
 922         struct ccw_dev_id devid;
 923         static char buf[128];
 924
 925         switch (reipl_method) {
 926         case REIPL_METHOD_CCW_CIO:
 927                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
 928                 devid.ssid  = 0;
 929                 reipl_ccw_dev(&devid);
 930                 break;
 931         case REIPL_METHOD_CCW_VM:
 932                 get_ipl_string(buf, reipl_block_ccw, REIPL_METHOD_CCW_VM);
 933                 __cpcmd(buf, NULL, 0, NULL);
 934                 break;
 935         case REIPL_METHOD_CCW_DIAG:
 936                 diag308(DIAG308_SET, reipl_block_ccw);
 937                 diag308(DIAG308_IPL, NULL);
 938                 break;
 939         case REIPL_METHOD_FCP_RW_DIAG:
 940                 diag308(DIAG308_SET, reipl_block_fcp);
 941                 diag308(DIAG308_IPL, NULL);
 942                 break;
 943         case REIPL_METHOD_FCP_RO_DIAG:
 944                 diag308(DIAG308_IPL, NULL);
 945                 break;
 946         case REIPL_METHOD_FCP_RO_VM:
 947                 __cpcmd("IPL", NULL, 0, NULL);
 948                 break;
 949         case REIPL_METHOD_NSS_DIAG:
 950                 diag308(DIAG308_SET, reipl_block_nss);
 951                 diag308(DIAG308_IPL, NULL);
 952                 break;
 953         case REIPL_METHOD_NSS:
 954                 get_ipl_string(buf, reipl_block_nss, REIPL_METHOD_NSS);
 955                 __cpcmd(buf, NULL, 0, NULL);
 956                 break;
 957         case REIPL_METHOD_DEFAULT:
 958                 if (MACHINE_IS_VM)
 959                         __cpcmd("IPL", NULL, 0, NULL);
 960                 diag308(DIAG308_IPL, NULL);
 961                 break;
 962         case REIPL_METHOD_FCP_DUMP:
 963         default:
 964                 break;
 965         }
 966         disabled_wait((unsigned long) __builtin_return_address(0));
 967 }
 968
 969 static void reipl_block_ccw_init(struct ipl_parameter_block *ipb)
 970 {
 971         ipb->hdr.len = IPL_PARM_BLK_CCW_LEN;
 972         ipb->hdr.version = IPL_PARM_BLOCK_VERSION;
 973         ipb->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
 974         ipb->hdr.pbt = DIAG308_IPL_TYPE_CCW;
 975 }
 976
 977 static void reipl_block_ccw_fill_parms(struct ipl_parameter_block *ipb)
 978 {
 979         /* LOADPARM */
 980         /* check if read scp info worked and set loadparm */
 981         if (sclp_ipl_info.is_valid)
 982                 memcpy(ipb->ipl_info.ccw.load_parm,
 983                                 &sclp_ipl_info.loadparm, LOADPARM_LEN);
 984         else
 985                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
 986                 memset(ipb->ipl_info.ccw.load_parm, 0x40, LOADPARM_LEN);
 987         ipb->hdr.flags = DIAG308_FLAGS_LP_VALID;
 988
 989         /* VM PARM */
 990         if (MACHINE_IS_VM && diag308_set_works &&
 991             (ipl_block.ipl_info.ccw.vm_flags & DIAG308_VM_FLAGS_VP_VALID)) {
 992
 993                 ipb->ipl_info.ccw.vm_flags |= DIAG308_VM_FLAGS_VP_VALID;
 994                 ipb->ipl_info.ccw.vm_parm_len =
 995                                         ipl_block.ipl_info.ccw.vm_parm_len;
 996                 memcpy(ipb->ipl_info.ccw.vm_parm,
 997                        ipl_block.ipl_info.ccw.vm_parm, DIAG308_VMPARM_SIZE);
 998         }
 999 }
1000
1001 static int __init reipl_nss_init(void)
1002 {
1003         int rc;
1004
1005         if (!MACHINE_IS_VM)
1006                 return 0;
1007
1008         reipl_block_nss = (void *) get_zeroed_page(GFP_KERNEL);
1009         if (!reipl_block_nss)
1010                 return -ENOMEM;
1011
1012         if (!diag308_set_works)
1013                 sys_reipl_nss_vmparm_attr.attr.mode = S_IRUGO;
1014
1015         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
1016         if (rc)
1017                 return rc;
1018
1019         reipl_block_ccw_init(reipl_block_nss);
1020         if (ipl_info.type == IPL_TYPE_NSS) {
1021                 memset(reipl_block_nss->ipl_info.ccw.nss_name,
1022                         ' ', NSS_NAME_SIZE);
1023                 memcpy(reipl_block_nss->ipl_info.ccw.nss_name,
1024                         kernel_nss_name, strlen(kernel_nss_name));
1025                 ASCEBC(reipl_block_nss->ipl_info.ccw.nss_name, NSS_NAME_SIZE);
1026                 reipl_block_nss->ipl_info.ccw.vm_flags |=
1027                         DIAG308_VM_FLAGS_NSS_VALID;
1028
1029                 reipl_block_ccw_fill_parms(reipl_block_nss);
1030         }
1031
1032         reipl_capabilities |= IPL_TYPE_NSS;
1033         return 0;
1034 }
1035
1036 static int __init reipl_ccw_init(void)
1037 {
1038         int rc;
1039
1040         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1041         if (!reipl_block_ccw)
1042                 return -ENOMEM;
1043
1044         if (MACHINE_IS_VM) {
1045                 if (!diag308_set_works)
1046                         sys_reipl_ccw_vmparm_attr.attr.mode = S_IRUGO;
1047                 rc = sysfs_create_group(&reipl_kset->kobj,
1048                                         &reipl_ccw_attr_group_vm);
1049         } else {
1050                 if(!diag308_set_works)
1051                         sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
1052                 rc = sysfs_create_group(&reipl_kset->kobj,
1053                                         &reipl_ccw_attr_group_lpar);
1054         }
1055         if (rc)
1056                 return rc;
1057
1058         reipl_block_ccw_init(reipl_block_ccw);
1059         if (ipl_info.type == IPL_TYPE_CCW) {
1060                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
1061                 reipl_block_ccw_fill_parms(reipl_block_ccw);
1062         }
1063
1064         reipl_capabilities |= IPL_TYPE_CCW;
1065         return 0;
1066 }
1067
1068 static int __init reipl_fcp_init(void)
1069 {
1070         int rc;
1071
1072         if ((!diag308_set_works) && (ipl_info.type != IPL_TYPE_FCP))
1073                 return 0;
1074         if ((!diag308_set_works) && (ipl_info.type == IPL_TYPE_FCP))
1075                 make_attrs_ro(reipl_fcp_attrs);
1076
1077         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1078         if (!reipl_block_fcp)
1079                 return -ENOMEM;
1080         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_fcp_attr_group);
1081         if (rc) {
1082                 free_page((unsigned long)reipl_block_fcp);
1083                 return rc;
1084         }
1085         if (ipl_info.type == IPL_TYPE_FCP) {
1086                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
1087         } else {
1088                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1089                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1090                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1091                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1092                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
1093         }
1094         reipl_capabilities |= IPL_TYPE_FCP;
1095         return 0;
1096 }
1097
1098 static int __init reipl_init(void)
1099 {
1100         int rc;
1101
1102         reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
1103         if (!reipl_kset)
1104                 return -ENOMEM;
1105         rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
1106         if (rc) {
1107                 kset_unregister(reipl_kset);
1108                 return rc;
1109         }
1110         rc = reipl_ccw_init();
1111         if (rc)
1112                 return rc;
1113         rc = reipl_fcp_init();
1114         if (rc)
1115                 return rc;
1116         rc = reipl_nss_init();
1117         if (rc)
1118                 return rc;
1119         rc = reipl_set_type(ipl_info.type);
1120         if (rc)
1121                 return rc;
1122         return 0;
1123 }
1124
1125 static struct shutdown_action __refdata reipl_action = {
1126         .name   = SHUTDOWN_ACTION_REIPL_STR,
1127         .fn     = reipl_run,
1128         .init   = reipl_init,
1129 };
1130
1131 /*
1132  * dump shutdown action: Dump Linux on shutdown.
1133  */
1134
1135 /* FCP dump device attributes */
1136
1137 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
1138                    dump_block_fcp->ipl_info.fcp.wwpn);
1139 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
1140                    dump_block_fcp->ipl_info.fcp.lun);
1141 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
1142                    dump_block_fcp->ipl_info.fcp.bootprog);
1143 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
1144                    dump_block_fcp->ipl_info.fcp.br_lba);
1145 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
1146                    dump_block_fcp->ipl_info.fcp.devno);
1147
1148 static struct attribute *dump_fcp_attrs[] = {
1149         &sys_dump_fcp_device_attr.attr,
1150         &sys_dump_fcp_wwpn_attr.attr,
1151         &sys_dump_fcp_lun_attr.attr,
1152         &sys_dump_fcp_bootprog_attr.attr,
1153         &sys_dump_fcp_br_lba_attr.attr,
1154         NULL,
1155 };
1156
1157 static struct attribute_group dump_fcp_attr_group = {
1158         .name  = IPL_FCP_STR,
1159         .attrs = dump_fcp_attrs,
1160 };
1161
1162 /* CCW dump device attributes */
1163
1164 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
1165                    dump_block_ccw->ipl_info.ccw.devno);
1166
1167 static struct attribute *dump_ccw_attrs[] = {
1168         &sys_dump_ccw_device_attr.attr,
1169         NULL,
1170 };
1171
1172 static struct attribute_group dump_ccw_attr_group = {
1173         .name  = IPL_CCW_STR,
1174         .attrs = dump_ccw_attrs,
1175 };
1176
1177 /* dump type */
1178
1179 static int dump_set_type(enum dump_type type)
1180 {
1181         if (!(dump_capabilities & type))
1182                 return -EINVAL;
1183         switch (type) {
1184         case DUMP_TYPE_CCW:
1185                 if (diag308_set_works)
1186                         dump_method = DUMP_METHOD_CCW_DIAG;
1187                 else if (MACHINE_IS_VM)
1188                         dump_method = DUMP_METHOD_CCW_VM;
1189                 else
1190                         dump_method = DUMP_METHOD_CCW_CIO;
1191                 break;
1192         case DUMP_TYPE_FCP:
1193                 dump_method = DUMP_METHOD_FCP_DIAG;
1194                 break;
1195         default:
1196                 dump_method = DUMP_METHOD_NONE;
1197         }
1198         dump_type = type;
1199         return 0;
1200 }
1201
1202 static ssize_t dump_type_show(struct kobject *kobj,
1203                               struct kobj_attribute *attr, char *page)
1204 {
1205         return sprintf(page, "%s\n", dump_type_str(dump_type));
1206 }
1207
1208 static ssize_t dump_type_store(struct kobject *kobj,
1209                                struct kobj_attribute *attr,
1210                                const char *buf, size_t len)
1211 {
1212         int rc = -EINVAL;
1213
1214         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
1215                 rc = dump_set_type(DUMP_TYPE_NONE);
1216         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
1217                 rc = dump_set_type(DUMP_TYPE_CCW);
1218         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
1219                 rc = dump_set_type(DUMP_TYPE_FCP);
1220         return (rc != 0) ? rc : len;
1221 }
1222
1223 static struct kobj_attribute dump_type_attr =
1224         __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
1225
1226 static struct kset *dump_kset;
1227
1228 static void dump_run(struct shutdown_trigger *trigger)
1229 {
1230         struct ccw_dev_id devid;
1231         static char buf[100];
1232
1233         switch (dump_method) {
1234         case DUMP_METHOD_CCW_CIO:
1235                 smp_send_stop();
1236                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
1237                 devid.ssid  = 0;
1238                 reipl_ccw_dev(&devid);
1239                 break;
1240         case DUMP_METHOD_CCW_VM:
1241                 smp_send_stop();
1242                 sprintf(buf, "STORE STATUS");
1243                 __cpcmd(buf, NULL, 0, NULL);
1244                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
1245                 __cpcmd(buf, NULL, 0, NULL);
1246                 break;
1247         case DUMP_METHOD_CCW_DIAG:
1248                 diag308(DIAG308_SET, dump_block_ccw);
1249                 diag308(DIAG308_DUMP, NULL);
1250                 break;
1251         case DUMP_METHOD_FCP_DIAG:
1252                 diag308(DIAG308_SET, dump_block_fcp);
1253                 diag308(DIAG308_DUMP, NULL);
1254                 break;
1255         case DUMP_METHOD_NONE:
1256         default:
1257                 return;
1258         }
1259         printk(KERN_EMERG "Dump failed!\n");
1260 }
1261
1262 static int __init dump_ccw_init(void)
1263 {
1264         int rc;
1265
1266         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1267         if (!dump_block_ccw)
1268                 return -ENOMEM;
1269         rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
1270         if (rc) {
1271                 free_page((unsigned long)dump_block_ccw);
1272                 return rc;
1273         }
1274         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
1275         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
1276         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1277         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1278         dump_capabilities |= DUMP_TYPE_CCW;
1279         return 0;
1280 }
1281
1282 static int __init dump_fcp_init(void)
1283 {
1284         int rc;
1285
1286         if (!sclp_ipl_info.has_dump)
1287                 return 0; /* LDIPL DUMP is not installed */
1288         if (!diag308_set_works)
1289                 return 0;
1290         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1291         if (!dump_block_fcp)
1292                 return -ENOMEM;
1293         rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
1294         if (rc) {
1295                 free_page((unsigned long)dump_block_fcp);
1296                 return rc;
1297         }
1298         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1299         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1300         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1301         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1302         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1303         dump_capabilities |= DUMP_TYPE_FCP;
1304         return 0;
1305 }
1306
1307 static int __init dump_init(void)
1308 {
1309         int rc;
1310
1311         dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1312         if (!dump_kset)
1313                 return -ENOMEM;
1314         rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr.attr);
1315         if (rc) {
1316                 kset_unregister(dump_kset);
1317                 return rc;
1318         }
1319         rc = dump_ccw_init();
1320         if (rc)
1321                 return rc;
1322         rc = dump_fcp_init();
1323         if (rc)
1324                 return rc;
1325         dump_set_type(DUMP_TYPE_NONE);
1326         return 0;
1327 }
1328
1329 static struct shutdown_action __refdata dump_action = {
1330         .name   = SHUTDOWN_ACTION_DUMP_STR,
1331         .fn     = dump_run,
1332         .init   = dump_init,
1333 };
1334
1335 /*
1336  * vmcmd shutdown action: Trigger vm command on shutdown.
1337  */
1338
1339 static char vmcmd_on_reboot[128];
1340 static char vmcmd_on_panic[128];
1341 static char vmcmd_on_halt[128];
1342 static char vmcmd_on_poff[128];
1343
1344 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_reboot, "%s\n", "%s\n", vmcmd_on_reboot);
1345 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_panic, "%s\n", "%s\n", vmcmd_on_panic);
1346 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_halt, "%s\n", "%s\n", vmcmd_on_halt);
1347 DEFINE_IPL_ATTR_STR_RW(vmcmd, on_poff, "%s\n", "%s\n", vmcmd_on_poff);
1348
1349 static struct attribute *vmcmd_attrs[] = {
1350         &sys_vmcmd_on_reboot_attr.attr,
1351         &sys_vmcmd_on_panic_attr.attr,
1352         &sys_vmcmd_on_halt_attr.attr,
1353         &sys_vmcmd_on_poff_attr.attr,
1354         NULL,
1355 };
1356
1357 static struct attribute_group vmcmd_attr_group = {
1358         .attrs = vmcmd_attrs,
1359 };
1360
1361 static struct kset *vmcmd_kset;
1362
1363 static void vmcmd_run(struct shutdown_trigger *trigger)
1364 {
1365         char *cmd, *next_cmd;
1366
1367         if (strcmp(trigger->name, ON_REIPL_STR) == 0)
1368                 cmd = vmcmd_on_reboot;
1369         else if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1370                 cmd = vmcmd_on_panic;
1371         else if (strcmp(trigger->name, ON_HALT_STR) == 0)
1372                 cmd = vmcmd_on_halt;
1373         else if (strcmp(trigger->name, ON_POFF_STR) == 0)
1374                 cmd = vmcmd_on_poff;
1375         else
1376                 return;
1377
1378         if (strlen(cmd) == 0)
1379                 return;
1380         do {
1381                 next_cmd = strchr(cmd, '\n');
1382                 if (next_cmd) {
1383                         next_cmd[0] = 0;
1384                         next_cmd += 1;
1385                 }
1386                 __cpcmd(cmd, NULL, 0, NULL);
1387                 cmd = next_cmd;
1388         } while (cmd != NULL);
1389 }
1390
1391 static int vmcmd_init(void)
1392 {
1393         if (!MACHINE_IS_VM)
1394                 return -ENOTSUPP;
1395         vmcmd_kset = kset_create_and_add("vmcmd", NULL, firmware_kobj);
1396         if (!vmcmd_kset)
1397                 return -ENOMEM;
1398         return sysfs_create_group(&vmcmd_kset->kobj, &vmcmd_attr_group);
1399 }
1400
1401 static struct shutdown_action vmcmd_action = {SHUTDOWN_ACTION_VMCMD_STR,
1402                                               vmcmd_run, vmcmd_init};
1403
1404 /*
1405  * stop shutdown action: Stop Linux on shutdown.
1406  */
1407
1408 static void stop_run(struct shutdown_trigger *trigger)
1409 {
1410         if (strcmp(trigger->name, ON_PANIC_STR) == 0)
1411                 disabled_wait((unsigned long) __builtin_return_address(0));
1412         else {
1413                 signal_processor(smp_processor_id(), sigp_stop);
1414                 for (;;);
1415         }
1416 }
1417
1418 static struct shutdown_action stop_action = {SHUTDOWN_ACTION_STOP_STR,
1419                                              stop_run, NULL};
1420
1421 /* action list */
1422
1423 static struct shutdown_action *shutdown_actions_list[] = {
1424         &ipl_action, &reipl_action, &dump_action, &vmcmd_action, &stop_action};
1425 #define SHUTDOWN_ACTIONS_COUNT (sizeof(shutdown_actions_list) / sizeof(void *))
1426
1427 /*
1428  * Trigger section
1429  */
1430
1431 static struct kset *shutdown_actions_kset;
1432
1433 static int set_trigger(const char *buf, struct shutdown_trigger *trigger,
1434                        size_t len)
1435 {
1436         int i;
1437         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1438                 if (!shutdown_actions_list[i])
1439                         continue;
1440                 if (strncmp(buf, shutdown_actions_list[i]->name,
1441                             strlen(shutdown_actions_list[i]->name)) == 0) {
1442                         trigger->action = shutdown_actions_list[i];
1443                         return len;
1444                 }
1445         }
1446         return -EINVAL;
1447 }
1448
1449 /* on reipl */
1450
1451 static struct shutdown_trigger on_reboot_trigger = {ON_REIPL_STR,
1452                                                     &reipl_action};
1453
1454 static ssize_t on_reboot_show(struct kobject *kobj,
1455                               struct kobj_attribute *attr, char *page)
1456 {
1457         return sprintf(page, "%s\n", on_reboot_trigger.action->name);
1458 }
1459
1460 static ssize_t on_reboot_store(struct kobject *kobj,
1461                                struct kobj_attribute *attr,
1462                                const char *buf, size_t len)
1463 {
1464         return set_trigger(buf, &on_reboot_trigger, len);
1465 }
1466
1467 static struct kobj_attribute on_reboot_attr =
1468         __ATTR(on_reboot, 0644, on_reboot_show, on_reboot_store);
1469
1470 static void do_machine_restart(char *__unused)
1471 {
1472         smp_send_stop();
1473         on_reboot_trigger.action->fn(&on_reboot_trigger);
1474         reipl_run(NULL);
1475 }
1476 void (*_machine_restart)(char *command) = do_machine_restart;
1477
1478 /* on panic */
1479
1480 static struct shutdown_trigger on_panic_trigger = {ON_PANIC_STR, &stop_action};
1481
1482 static ssize_t on_panic_show(struct kobject *kobj,
1483                              struct kobj_attribute *attr, char *page)
1484 {
1485         return sprintf(page, "%s\n", on_panic_trigger.action->name);
1486 }
1487
1488 static ssize_t on_panic_store(struct kobject *kobj,
1489                               struct kobj_attribute *attr,
1490                               const char *buf, size_t len)
1491 {
1492         return set_trigger(buf, &on_panic_trigger, len);
1493 }
1494
1495 static struct kobj_attribute on_panic_attr =
1496         __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
1497
1498 static void do_panic(void)
1499 {
1500         on_panic_trigger.action->fn(&on_panic_trigger);
1501         stop_run(&on_panic_trigger);
1502 }
1503
1504 /* on halt */
1505
1506 static struct shutdown_trigger on_halt_trigger = {ON_HALT_STR, &stop_action};
1507
1508 static ssize_t on_halt_show(struct kobject *kobj,
1509                             struct kobj_attribute *attr, char *page)
1510 {
1511         return sprintf(page, "%s\n", on_halt_trigger.action->name);
1512 }
1513
1514 static ssize_t on_halt_store(struct kobject *kobj,
1515                              struct kobj_attribute *attr,
1516                              const char *buf, size_t len)
1517 {
1518         return set_trigger(buf, &on_halt_trigger, len);
1519 }
1520
1521 static struct kobj_attribute on_halt_attr =
1522         __ATTR(on_halt, 0644, on_halt_show, on_halt_store);
1523
1524
1525 static void do_machine_halt(void)
1526 {
1527         smp_send_stop();
1528         on_halt_trigger.action->fn(&on_halt_trigger);
1529         stop_run(&on_halt_trigger);
1530 }
1531 void (*_machine_halt)(void) = do_machine_halt;
1532
1533 /* on power off */
1534
1535 static struct shutdown_trigger on_poff_trigger = {ON_POFF_STR, &stop_action};
1536
1537 static ssize_t on_poff_show(struct kobject *kobj,
1538                             struct kobj_attribute *attr, char *page)
1539 {
1540         return sprintf(page, "%s\n", on_poff_trigger.action->name);
1541 }
1542
1543 static ssize_t on_poff_store(struct kobject *kobj,
1544                              struct kobj_attribute *attr,
1545                              const char *buf, size_t len)
1546 {
1547         return set_trigger(buf, &on_poff_trigger, len);
1548 }
1549
1550 static struct kobj_attribute on_poff_attr =
1551         __ATTR(on_poff, 0644, on_poff_show, on_poff_store);
1552
1553
1554 static void do_machine_power_off(void)
1555 {
1556         smp_send_stop();
1557         on_poff_trigger.action->fn(&on_poff_trigger);
1558         stop_run(&on_poff_trigger);
1559 }
1560 void (*_machine_power_off)(void) = do_machine_power_off;
1561
1562 static void __init shutdown_triggers_init(void)
1563 {
1564         shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1565                                                     firmware_kobj);
1566         if (!shutdown_actions_kset)
1567                 goto fail;
1568         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1569                               &on_reboot_attr.attr))
1570                 goto fail;
1571         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1572                               &on_panic_attr.attr))
1573                 goto fail;
1574         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1575                               &on_halt_attr.attr))
1576                 goto fail;
1577         if (sysfs_create_file(&shutdown_actions_kset->kobj,
1578                               &on_poff_attr.attr))
1579                 goto fail;
1580
1581         return;
1582 fail:
1583         panic("shutdown_triggers_init failed\n");
1584 }
1585
1586 static void __init shutdown_actions_init(void)
1587 {
1588         int i;
1589
1590         for (i = 0; i < SHUTDOWN_ACTIONS_COUNT; i++) {
1591                 if (!shutdown_actions_list[i]->init)
1592                         continue;
1593                 if (shutdown_actions_list[i]->init())
1594                         shutdown_actions_list[i] = NULL;
1595         }
1596 }
1597
1598 static int __init s390_ipl_init(void)
1599 {
1600         sclp_get_ipl_info(&sclp_ipl_info);
1601         shutdown_actions_init();
1602         shutdown_triggers_init();
1603         return 0;
1604 }
1605
1606 __initcall(s390_ipl_init);
1607
1608 static void __init strncpy_skip_quote(char *dst, char *src, int n)
1609 {
1610         int sx, dx;
1611
1612         dx = 0;
1613         for (sx = 0; src[sx] != 0; sx++) {
1614                 if (src[sx] == '"')
1615                         continue;
1616                 dst[dx++] = src[sx];
1617                 if (dx >= n)
1618                         break;
1619         }
1620 }
1621
1622 static int __init vmcmd_on_reboot_setup(char *str)
1623 {
1624         if (!MACHINE_IS_VM)
1625                 return 1;
1626         strncpy_skip_quote(vmcmd_on_reboot, str, 127);
1627         vmcmd_on_reboot[127] = 0;
1628         on_reboot_trigger.action = &vmcmd_action;
1629         return 1;
1630 }
1631 __setup("vmreboot=", vmcmd_on_reboot_setup);
1632
1633 static int __init vmcmd_on_panic_setup(char *str)
1634 {
1635         if (!MACHINE_IS_VM)
1636                 return 1;
1637         strncpy_skip_quote(vmcmd_on_panic, str, 127);
1638         vmcmd_on_panic[127] = 0;
1639         on_panic_trigger.action = &vmcmd_action;
1640         return 1;
1641 }
1642 __setup("vmpanic=", vmcmd_on_panic_setup);
1643
1644 static int __init vmcmd_on_halt_setup(char *str)
1645 {
1646         if (!MACHINE_IS_VM)
1647                 return 1;
1648         strncpy_skip_quote(vmcmd_on_halt, str, 127);
1649         vmcmd_on_halt[127] = 0;
1650         on_halt_trigger.action = &vmcmd_action;
1651         return 1;
1652 }
1653 __setup("vmhalt=", vmcmd_on_halt_setup);
1654
1655 static int __init vmcmd_on_poff_setup(char *str)
1656 {
1657         if (!MACHINE_IS_VM)
1658                 return 1;
1659         strncpy_skip_quote(vmcmd_on_poff, str, 127);
1660         vmcmd_on_poff[127] = 0;
1661         on_poff_trigger.action = &vmcmd_action;
1662         return 1;
1663 }
1664 __setup("vmpoff=", vmcmd_on_poff_setup);
1665
1666 static int on_panic_notify(struct notifier_block *self,
1667                            unsigned long event, void *data)
1668 {
1669         do_panic();
1670         return NOTIFY_OK;
1671 }
1672
1673 static struct notifier_block on_panic_nb = {
1674         .notifier_call = on_panic_notify,
1675         .priority = 0,
1676 };
1677
1678 void __init setup_ipl(void)
1679 {
1680         ipl_info.type = get_ipl_type();
1681         switch (ipl_info.type) {
1682         case IPL_TYPE_CCW:
1683                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
1684                 ipl_info.data.ccw.dev_id.ssid = 0;
1685                 break;
1686         case IPL_TYPE_FCP:
1687         case IPL_TYPE_FCP_DUMP:
1688                 ipl_info.data.fcp.dev_id.devno =
1689                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
1690                 ipl_info.data.fcp.dev_id.ssid = 0;
1691                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
1692                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
1693                 break;
1694         case IPL_TYPE_NSS:
1695                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
1696                         sizeof(ipl_info.data.nss.name));
1697                 break;
1698         case IPL_TYPE_UNKNOWN:
1699         default:
1700                 /* We have no info to copy */
1701                 break;
1702         }
1703         atomic_notifier_chain_register(&panic_notifier_list, &on_panic_nb);
1704 }
1705
1706 void __init ipl_update_parameters(void)
1707 {
1708         if (diag308(DIAG308_STORE, &ipl_block) == DIAG308_RC_OK)
1709                 diag308_set_works = 1;
1710 }
1711
1712 void __init ipl_save_parameters(void)
1713 {
1714         struct cio_iplinfo iplinfo;
1715         unsigned int *ipl_ptr;
1716         void *src, *dst;
1717
1718         if (cio_get_iplinfo(&iplinfo))
1719                 return;
1720
1721         ipl_devno = iplinfo.devno;
1722         ipl_flags |= IPL_DEVNO_VALID;
1723         if (!iplinfo.is_qdio)
1724                 return;
1725         ipl_flags |= IPL_PARMBLOCK_VALID;
1726         ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
1727         src = (void *)(unsigned long)*ipl_ptr;
1728         dst = (void *)IPL_PARMBLOCK_ORIGIN;
1729         memmove(dst, src, PAGE_SIZE);
1730         *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
1731 }
1732
1733 static LIST_HEAD(rcall);
1734 static DEFINE_MUTEX(rcall_mutex);
1735
1736 void register_reset_call(struct reset_call *reset)
1737 {
1738         mutex_lock(&rcall_mutex);
1739         list_add(&reset->list, &rcall);
1740         mutex_unlock(&rcall_mutex);
1741 }
1742 EXPORT_SYMBOL_GPL(register_reset_call);
1743
1744 void unregister_reset_call(struct reset_call *reset)
1745 {
1746         mutex_lock(&rcall_mutex);
1747         list_del(&reset->list);
1748         mutex_unlock(&rcall_mutex);
1749 }
1750 EXPORT_SYMBOL_GPL(unregister_reset_call);
1751
1752 static void do_reset_calls(void)
1753 {
1754         struct reset_call *reset;
1755
1756         list_for_each_entry(reset, &rcall, list)
1757                 reset->fn();
1758 }
1759
1760 u32 dump_prefix_page;
1761
1762 void s390_reset_system(void)
1763 {
1764         struct _lowcore *lc;
1765
1766         lc = (struct _lowcore *)(unsigned long) store_prefix();
1767
1768         /* Stack for interrupt/machine check handler */
1769         lc->panic_stack = S390_lowcore.panic_stack;
1770
1771         /* Save prefix page address for dump case */
1772         dump_prefix_page = (u32)(unsigned long) lc;
1773
1774         /* Disable prefixing */
1775         set_prefix(0);
1776
1777         /* Disable lowcore protection */
1778         __ctl_clear_bit(0,28);
1779
1780         /* Set new machine check handler */
1781         S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1782         S390_lowcore.mcck_new_psw.addr =
1783                 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
1784
1785         /* Set new program check handler */
1786         S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1787         S390_lowcore.program_new_psw.addr =
1788                 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
1789
1790         do_reset_calls();
1791 }
1792