arch/s390/kernel/ipl.c

   1 /*
   2  *  arch/s390/kernel/ipl.c
   3  *    ipl/reipl/dump support for Linux on s390.
   4  *
   5  *    Copyright (C) IBM Corp. 2005,2006
   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 <asm/ipl.h>
  18 #include <asm/smp.h>
  19 #include <asm/setup.h>
  20 #include <asm/cpcmd.h>
  21 #include <asm/cio.h>
  22 #include <asm/ebcdic.h>
  23 #include <asm/reset.h>
  24 #include <asm/sclp.h>
  25
  26 #define IPL_PARM_BLOCK_VERSION 0
  27
  28 #define IPL_UNKNOWN_STR         "unknown"
  29 #define IPL_CCW_STR             "ccw"
  30 #define IPL_FCP_STR             "fcp"
  31 #define IPL_FCP_DUMP_STR        "fcp_dump"
  32 #define IPL_NSS_STR             "nss"
  33
  34 static char *ipl_type_str(enum ipl_type type)
  35 {
  36         switch (type) {
  37         case IPL_TYPE_CCW:
  38                 return IPL_CCW_STR;
  39         case IPL_TYPE_FCP:
  40                 return IPL_FCP_STR;
  41         case IPL_TYPE_FCP_DUMP:
  42                 return IPL_FCP_DUMP_STR;
  43         case IPL_TYPE_NSS:
  44                 return IPL_NSS_STR;
  45         case IPL_TYPE_UNKNOWN:
  46         default:
  47                 return IPL_UNKNOWN_STR;
  48         }
  49 }
  50
  51 enum dump_type {
  52         DUMP_TYPE_NONE  = 1,
  53         DUMP_TYPE_CCW   = 2,
  54         DUMP_TYPE_FCP   = 4,
  55 };
  56
  57 #define DUMP_NONE_STR    "none"
  58 #define DUMP_CCW_STR     "ccw"
  59 #define DUMP_FCP_STR     "fcp"
  60
  61 static char *dump_type_str(enum dump_type type)
  62 {
  63         switch (type) {
  64         case DUMP_TYPE_NONE:
  65                 return DUMP_NONE_STR;
  66         case DUMP_TYPE_CCW:
  67                 return DUMP_CCW_STR;
  68         case DUMP_TYPE_FCP:
  69                 return DUMP_FCP_STR;
  70         default:
  71                 return NULL;
  72         }
  73 }
  74
  75 /*
  76  * Must be in data section since the bss section
  77  * is not cleared when these are accessed.
  78  */
  79 static u16 ipl_devno __attribute__((__section__(".data"))) = 0;
  80 u32 ipl_flags __attribute__((__section__(".data"))) = 0;
  81
  82 enum ipl_method {
  83         REIPL_METHOD_CCW_CIO,
  84         REIPL_METHOD_CCW_DIAG,
  85         REIPL_METHOD_CCW_VM,
  86         REIPL_METHOD_FCP_RO_DIAG,
  87         REIPL_METHOD_FCP_RW_DIAG,
  88         REIPL_METHOD_FCP_RO_VM,
  89         REIPL_METHOD_FCP_DUMP,
  90         REIPL_METHOD_NSS,
  91         REIPL_METHOD_DEFAULT,
  92 };
  93
  94 enum dump_method {
  95         DUMP_METHOD_NONE,
  96         DUMP_METHOD_CCW_CIO,
  97         DUMP_METHOD_CCW_DIAG,
  98         DUMP_METHOD_CCW_VM,
  99         DUMP_METHOD_FCP_DIAG,
 100 };
 101
 102 enum shutdown_action {
 103         SHUTDOWN_REIPL,
 104         SHUTDOWN_DUMP,
 105         SHUTDOWN_STOP,
 106 };
 107
 108 #define SHUTDOWN_REIPL_STR "reipl"
 109 #define SHUTDOWN_DUMP_STR  "dump"
 110 #define SHUTDOWN_STOP_STR  "stop"
 111
 112 static char *shutdown_action_str(enum shutdown_action action)
 113 {
 114         switch (action) {
 115         case SHUTDOWN_REIPL:
 116                 return SHUTDOWN_REIPL_STR;
 117         case SHUTDOWN_DUMP:
 118                 return SHUTDOWN_DUMP_STR;
 119         case SHUTDOWN_STOP:
 120                 return SHUTDOWN_STOP_STR;
 121         default:
 122                 return NULL;
 123         }
 124 }
 125
 126 static int diag308_set_works = 0;
 127
 128 static int reipl_capabilities = IPL_TYPE_UNKNOWN;
 129
 130 static enum ipl_type reipl_type = IPL_TYPE_UNKNOWN;
 131 static enum ipl_method reipl_method = REIPL_METHOD_DEFAULT;
 132 static struct ipl_parameter_block *reipl_block_fcp;
 133 static struct ipl_parameter_block *reipl_block_ccw;
 134
 135 static char reipl_nss_name[NSS_NAME_SIZE + 1];
 136
 137 static int dump_capabilities = DUMP_TYPE_NONE;
 138 static enum dump_type dump_type = DUMP_TYPE_NONE;
 139 static enum dump_method dump_method = DUMP_METHOD_NONE;
 140 static struct ipl_parameter_block *dump_block_fcp;
 141 static struct ipl_parameter_block *dump_block_ccw;
 142
 143 static enum shutdown_action on_panic_action = SHUTDOWN_STOP;
 144
 145 static struct sclp_ipl_info sclp_ipl_info;
 146
 147 int diag308(unsigned long subcode, void *addr)
 148 {
 149         register unsigned long _addr asm("0") = (unsigned long) addr;
 150         register unsigned long _rc asm("1") = 0;
 151
 152         asm volatile(
 153                 "       diag    %0,%2,0x308\n"
 154                 "0:\n"
 155                 EX_TABLE(0b,0b)
 156                 : "+d" (_addr), "+d" (_rc)
 157                 : "d" (subcode) : "cc", "memory");
 158         return _rc;
 159 }
 160 EXPORT_SYMBOL_GPL(diag308);
 161
 162 /* SYSFS */
 163
 164 #define DEFINE_IPL_ATTR_RO(_prefix, _name, _format, _value)             \
 165 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 166                 struct kobj_attribute *attr,                            \
 167                 char *page)                                             \
 168 {                                                                       \
 169         return sprintf(page, _format, _value);                          \
 170 }                                                                       \
 171 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 172         __ATTR(_name, S_IRUGO, sys_##_prefix##_##_name##_show, NULL);
 173
 174 #define DEFINE_IPL_ATTR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)   \
 175 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 176                 struct kobj_attribute *attr,                            \
 177                 char *page)                                             \
 178 {                                                                       \
 179         return sprintf(page, _fmt_out,                                  \
 180                         (unsigned long long) _value);                   \
 181 }                                                                       \
 182 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
 183                 struct kobj_attribute *attr,                            \
 184                 const char *buf, size_t len)                            \
 185 {                                                                       \
 186         unsigned long long value;                                       \
 187         if (sscanf(buf, _fmt_in, &value) != 1)                          \
 188                 return -EINVAL;                                         \
 189         _value = value;                                                 \
 190         return len;                                                     \
 191 }                                                                       \
 192 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 193         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 194                         sys_##_prefix##_##_name##_show,                 \
 195                         sys_##_prefix##_##_name##_store);
 196
 197 #define DEFINE_IPL_ATTR_STR_RW(_prefix, _name, _fmt_out, _fmt_in, _value)\
 198 static ssize_t sys_##_prefix##_##_name##_show(struct kobject *kobj,     \
 199                 struct kobj_attribute *attr,                            \
 200                 char *page)                                             \
 201 {                                                                       \
 202         return sprintf(page, _fmt_out, _value);                         \
 203 }                                                                       \
 204 static ssize_t sys_##_prefix##_##_name##_store(struct kobject *kobj,    \
 205                 struct kobj_attribute *attr,                            \
 206                 const char *buf, size_t len)                            \
 207 {                                                                       \
 208         if (sscanf(buf, _fmt_in, _value) != 1)                          \
 209                 return -EINVAL;                                         \
 210         return len;                                                     \
 211 }                                                                       \
 212 static struct kobj_attribute sys_##_prefix##_##_name##_attr =           \
 213         __ATTR(_name,(S_IRUGO | S_IWUSR),                               \
 214                         sys_##_prefix##_##_name##_show,                 \
 215                         sys_##_prefix##_##_name##_store);
 216
 217 static void make_attrs_ro(struct attribute **attrs)
 218 {
 219         while (*attrs) {
 220                 (*attrs)->mode = S_IRUGO;
 221                 attrs++;
 222         }
 223 }
 224
 225 /*
 226  * ipl section
 227  */
 228
 229 static __init enum ipl_type get_ipl_type(void)
 230 {
 231         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 232
 233         if (ipl_flags & IPL_NSS_VALID)
 234                 return IPL_TYPE_NSS;
 235         if (!(ipl_flags & IPL_DEVNO_VALID))
 236                 return IPL_TYPE_UNKNOWN;
 237         if (!(ipl_flags & IPL_PARMBLOCK_VALID))
 238                 return IPL_TYPE_CCW;
 239         if (ipl->hdr.version > IPL_MAX_SUPPORTED_VERSION)
 240                 return IPL_TYPE_UNKNOWN;
 241         if (ipl->hdr.pbt != DIAG308_IPL_TYPE_FCP)
 242                 return IPL_TYPE_UNKNOWN;
 243         if (ipl->ipl_info.fcp.opt == DIAG308_IPL_OPT_DUMP)
 244                 return IPL_TYPE_FCP_DUMP;
 245         return IPL_TYPE_FCP;
 246 }
 247
 248 void __init setup_ipl_info(void)
 249 {
 250         ipl_info.type = get_ipl_type();
 251         switch (ipl_info.type) {
 252         case IPL_TYPE_CCW:
 253                 ipl_info.data.ccw.dev_id.devno = ipl_devno;
 254                 ipl_info.data.ccw.dev_id.ssid = 0;
 255                 break;
 256         case IPL_TYPE_FCP:
 257         case IPL_TYPE_FCP_DUMP:
 258                 ipl_info.data.fcp.dev_id.devno =
 259                         IPL_PARMBLOCK_START->ipl_info.fcp.devno;
 260                 ipl_info.data.fcp.dev_id.ssid = 0;
 261                 ipl_info.data.fcp.wwpn = IPL_PARMBLOCK_START->ipl_info.fcp.wwpn;
 262                 ipl_info.data.fcp.lun = IPL_PARMBLOCK_START->ipl_info.fcp.lun;
 263                 break;
 264         case IPL_TYPE_NSS:
 265                 strncpy(ipl_info.data.nss.name, kernel_nss_name,
 266                         sizeof(ipl_info.data.nss.name));
 267                 break;
 268         case IPL_TYPE_UNKNOWN:
 269         default:
 270                 /* We have no info to copy */
 271                 break;
 272         }
 273 }
 274
 275 struct ipl_info ipl_info;
 276 EXPORT_SYMBOL_GPL(ipl_info);
 277
 278 static ssize_t ipl_type_show(struct kobject *kobj, struct kobj_attribute *attr,
 279                              char *page)
 280 {
 281         return sprintf(page, "%s\n", ipl_type_str(ipl_info.type));
 282 }
 283
 284 static struct kobj_attribute sys_ipl_type_attr = __ATTR_RO(ipl_type);
 285
 286 static ssize_t sys_ipl_device_show(struct kobject *kobj,
 287                                    struct kobj_attribute *attr, char *page)
 288 {
 289         struct ipl_parameter_block *ipl = IPL_PARMBLOCK_START;
 290
 291         switch (ipl_info.type) {
 292         case IPL_TYPE_CCW:
 293                 return sprintf(page, "0.0.%04x\n", ipl_devno);
 294         case IPL_TYPE_FCP:
 295         case IPL_TYPE_FCP_DUMP:
 296                 return sprintf(page, "0.0.%04x\n", ipl->ipl_info.fcp.devno);
 297         default:
 298                 return 0;
 299         }
 300 }
 301
 302 static struct kobj_attribute sys_ipl_device_attr =
 303         __ATTR(device, S_IRUGO, sys_ipl_device_show, NULL);
 304
 305 static ssize_t ipl_parameter_read(struct kobject *kobj, struct bin_attribute *attr,
 306                                   char *buf, loff_t off, size_t count)
 307 {
 308         unsigned int size = IPL_PARMBLOCK_SIZE;
 309
 310         if (off > size)
 311                 return 0;
 312         if (off + count > size)
 313                 count = size - off;
 314         memcpy(buf, (void *)IPL_PARMBLOCK_START + off, count);
 315         return count;
 316 }
 317
 318 static struct bin_attribute ipl_parameter_attr = {
 319         .attr = {
 320                 .name = "binary_parameter",
 321                 .mode = S_IRUGO,
 322         },
 323         .size = PAGE_SIZE,
 324         .read = &ipl_parameter_read,
 325 };
 326
 327 static ssize_t ipl_scp_data_read(struct kobject *kobj, struct bin_attribute *attr,
 328                                  char *buf, loff_t off, size_t count)
 329 {
 330         unsigned int size = IPL_PARMBLOCK_START->ipl_info.fcp.scp_data_len;
 331         void *scp_data = &IPL_PARMBLOCK_START->ipl_info.fcp.scp_data;
 332
 333         if (off > size)
 334                 return 0;
 335         if (off + count > size)
 336                 count = size - off;
 337         memcpy(buf, scp_data + off, count);
 338         return count;
 339 }
 340
 341 static struct bin_attribute ipl_scp_data_attr = {
 342         .attr = {
 343                 .name = "scp_data",
 344                 .mode = S_IRUGO,
 345         },
 346         .size = PAGE_SIZE,
 347         .read = ipl_scp_data_read,
 348 };
 349
 350 /* FCP ipl device attributes */
 351
 352 DEFINE_IPL_ATTR_RO(ipl_fcp, wwpn, "0x%016llx\n", (unsigned long long)
 353                    IPL_PARMBLOCK_START->ipl_info.fcp.wwpn);
 354 DEFINE_IPL_ATTR_RO(ipl_fcp, lun, "0x%016llx\n", (unsigned long long)
 355                    IPL_PARMBLOCK_START->ipl_info.fcp.lun);
 356 DEFINE_IPL_ATTR_RO(ipl_fcp, bootprog, "%lld\n", (unsigned long long)
 357                    IPL_PARMBLOCK_START->ipl_info.fcp.bootprog);
 358 DEFINE_IPL_ATTR_RO(ipl_fcp, br_lba, "%lld\n", (unsigned long long)
 359                    IPL_PARMBLOCK_START->ipl_info.fcp.br_lba);
 360
 361 static struct attribute *ipl_fcp_attrs[] = {
 362         &sys_ipl_type_attr.attr,
 363         &sys_ipl_device_attr.attr,
 364         &sys_ipl_fcp_wwpn_attr.attr,
 365         &sys_ipl_fcp_lun_attr.attr,
 366         &sys_ipl_fcp_bootprog_attr.attr,
 367         &sys_ipl_fcp_br_lba_attr.attr,
 368         NULL,
 369 };
 370
 371 static struct attribute_group ipl_fcp_attr_group = {
 372         .attrs = ipl_fcp_attrs,
 373 };
 374
 375 /* CCW ipl device attributes */
 376
 377 static ssize_t ipl_ccw_loadparm_show(struct kobject *kobj,
 378                                      struct kobj_attribute *attr, char *page)
 379 {
 380         char loadparm[LOADPARM_LEN + 1] = {};
 381
 382         if (!sclp_ipl_info.is_valid)
 383                 return sprintf(page, "#unknown#\n");
 384         memcpy(loadparm, &sclp_ipl_info.loadparm, LOADPARM_LEN);
 385         EBCASC(loadparm, LOADPARM_LEN);
 386         strstrip(loadparm);
 387         return sprintf(page, "%s\n", loadparm);
 388 }
 389
 390 static struct kobj_attribute sys_ipl_ccw_loadparm_attr =
 391         __ATTR(loadparm, 0444, ipl_ccw_loadparm_show, NULL);
 392
 393 static struct attribute *ipl_ccw_attrs[] = {
 394         &sys_ipl_type_attr.attr,
 395         &sys_ipl_device_attr.attr,
 396         &sys_ipl_ccw_loadparm_attr.attr,
 397         NULL,
 398 };
 399
 400 static struct attribute_group ipl_ccw_attr_group = {
 401         .attrs = ipl_ccw_attrs,
 402 };
 403
 404 /* NSS ipl device attributes */
 405
 406 DEFINE_IPL_ATTR_RO(ipl_nss, name, "%s\n", kernel_nss_name);
 407
 408 static struct attribute *ipl_nss_attrs[] = {
 409         &sys_ipl_type_attr.attr,
 410         &sys_ipl_nss_name_attr.attr,
 411         NULL,
 412 };
 413
 414 static struct attribute_group ipl_nss_attr_group = {
 415         .attrs = ipl_nss_attrs,
 416 };
 417
 418 /* UNKNOWN ipl device attributes */
 419
 420 static struct attribute *ipl_unknown_attrs[] = {
 421         &sys_ipl_type_attr.attr,
 422         NULL,
 423 };
 424
 425 static struct attribute_group ipl_unknown_attr_group = {
 426         .attrs = ipl_unknown_attrs,
 427 };
 428
 429 static struct kset *ipl_kset;
 430
 431 /*
 432  * reipl section
 433  */
 434
 435 /* FCP reipl device attributes */
 436
 437 DEFINE_IPL_ATTR_RW(reipl_fcp, wwpn, "0x%016llx\n", "%016llx\n",
 438                    reipl_block_fcp->ipl_info.fcp.wwpn);
 439 DEFINE_IPL_ATTR_RW(reipl_fcp, lun, "0x%016llx\n", "%016llx\n",
 440                    reipl_block_fcp->ipl_info.fcp.lun);
 441 DEFINE_IPL_ATTR_RW(reipl_fcp, bootprog, "%lld\n", "%lld\n",
 442                    reipl_block_fcp->ipl_info.fcp.bootprog);
 443 DEFINE_IPL_ATTR_RW(reipl_fcp, br_lba, "%lld\n", "%lld\n",
 444                    reipl_block_fcp->ipl_info.fcp.br_lba);
 445 DEFINE_IPL_ATTR_RW(reipl_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 446                    reipl_block_fcp->ipl_info.fcp.devno);
 447
 448 static struct attribute *reipl_fcp_attrs[] = {
 449         &sys_reipl_fcp_device_attr.attr,
 450         &sys_reipl_fcp_wwpn_attr.attr,
 451         &sys_reipl_fcp_lun_attr.attr,
 452         &sys_reipl_fcp_bootprog_attr.attr,
 453         &sys_reipl_fcp_br_lba_attr.attr,
 454         NULL,
 455 };
 456
 457 static struct attribute_group reipl_fcp_attr_group = {
 458         .name  = IPL_FCP_STR,
 459         .attrs = reipl_fcp_attrs,
 460 };
 461
 462 /* CCW reipl device attributes */
 463
 464 DEFINE_IPL_ATTR_RW(reipl_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
 465         reipl_block_ccw->ipl_info.ccw.devno);
 466
 467 static void reipl_get_ascii_loadparm(char *loadparm)
 468 {
 469         memcpy(loadparm, &reipl_block_ccw->ipl_info.ccw.load_param,
 470                LOADPARM_LEN);
 471         EBCASC(loadparm, LOADPARM_LEN);
 472         loadparm[LOADPARM_LEN] = 0;
 473         strstrip(loadparm);
 474 }
 475
 476 static ssize_t reipl_ccw_loadparm_show(struct kobject *kobj,
 477                                        struct kobj_attribute *attr, char *page)
 478 {
 479         char buf[LOADPARM_LEN + 1];
 480
 481         reipl_get_ascii_loadparm(buf);
 482         return sprintf(page, "%s\n", buf);
 483 }
 484
 485 static ssize_t reipl_ccw_loadparm_store(struct kobject *kobj,
 486                                         struct kobj_attribute *attr,
 487                                         const char *buf, size_t len)
 488 {
 489         int i, lp_len;
 490
 491         /* ignore trailing newline */
 492         lp_len = len;
 493         if ((len > 0) && (buf[len - 1] == '\n'))
 494                 lp_len--;
 495         /* loadparm can have max 8 characters and must not start with a blank */
 496         if ((lp_len > LOADPARM_LEN) || ((lp_len > 0) && (buf[0] == ' ')))
 497                 return -EINVAL;
 498         /* loadparm can only contain "a-z,A-Z,0-9,SP,." */
 499         for (i = 0; i < lp_len; i++) {
 500                 if (isalpha(buf[i]) || isdigit(buf[i]) || (buf[i] == ' ') ||
 501                     (buf[i] == '.'))
 502                         continue;
 503                 return -EINVAL;
 504         }
 505         /* initialize loadparm with blanks */
 506         memset(&reipl_block_ccw->ipl_info.ccw.load_param, ' ', LOADPARM_LEN);
 507         /* copy and convert to ebcdic */
 508         memcpy(&reipl_block_ccw->ipl_info.ccw.load_param, buf, lp_len);
 509         ASCEBC(reipl_block_ccw->ipl_info.ccw.load_param, LOADPARM_LEN);
 510         return len;
 511 }
 512
 513 static struct kobj_attribute sys_reipl_ccw_loadparm_attr =
 514         __ATTR(loadparm, 0644, reipl_ccw_loadparm_show,
 515                reipl_ccw_loadparm_store);
 516
 517 static struct attribute *reipl_ccw_attrs[] = {
 518         &sys_reipl_ccw_device_attr.attr,
 519         &sys_reipl_ccw_loadparm_attr.attr,
 520         NULL,
 521 };
 522
 523 static struct attribute_group reipl_ccw_attr_group = {
 524         .name  = IPL_CCW_STR,
 525         .attrs = reipl_ccw_attrs,
 526 };
 527
 528
 529 /* NSS reipl device attributes */
 530
 531 DEFINE_IPL_ATTR_STR_RW(reipl_nss, name, "%s\n", "%s\n", reipl_nss_name);
 532
 533 static struct attribute *reipl_nss_attrs[] = {
 534         &sys_reipl_nss_name_attr.attr,
 535         NULL,
 536 };
 537
 538 static struct attribute_group reipl_nss_attr_group = {
 539         .name  = IPL_NSS_STR,
 540         .attrs = reipl_nss_attrs,
 541 };
 542
 543 /* reipl type */
 544
 545 static int reipl_set_type(enum ipl_type type)
 546 {
 547         if (!(reipl_capabilities & type))
 548                 return -EINVAL;
 549
 550         switch(type) {
 551         case IPL_TYPE_CCW:
 552                 if (MACHINE_IS_VM)
 553                         reipl_method = REIPL_METHOD_CCW_VM;
 554                 else
 555                         reipl_method = REIPL_METHOD_CCW_CIO;
 556                 break;
 557         case IPL_TYPE_FCP:
 558                 if (diag308_set_works)
 559                         reipl_method = REIPL_METHOD_FCP_RW_DIAG;
 560                 else if (MACHINE_IS_VM)
 561                         reipl_method = REIPL_METHOD_FCP_RO_VM;
 562                 else
 563                         reipl_method = REIPL_METHOD_FCP_RO_DIAG;
 564                 break;
 565         case IPL_TYPE_FCP_DUMP:
 566                 reipl_method = REIPL_METHOD_FCP_DUMP;
 567                 break;
 568         case IPL_TYPE_NSS:
 569                 reipl_method = REIPL_METHOD_NSS;
 570                 break;
 571         case IPL_TYPE_UNKNOWN:
 572                 reipl_method = REIPL_METHOD_DEFAULT;
 573                 break;
 574         default:
 575                 BUG();
 576         }
 577         reipl_type = type;
 578         return 0;
 579 }
 580
 581 static ssize_t reipl_type_show(struct kobject *kobj,
 582                                struct kobj_attribute *attr, char *page)
 583 {
 584         return sprintf(page, "%s\n", ipl_type_str(reipl_type));
 585 }
 586
 587 static ssize_t reipl_type_store(struct kobject *kobj,
 588                                 struct kobj_attribute *attr,
 589                                 const char *buf, size_t len)
 590 {
 591         int rc = -EINVAL;
 592
 593         if (strncmp(buf, IPL_CCW_STR, strlen(IPL_CCW_STR)) == 0)
 594                 rc = reipl_set_type(IPL_TYPE_CCW);
 595         else if (strncmp(buf, IPL_FCP_STR, strlen(IPL_FCP_STR)) == 0)
 596                 rc = reipl_set_type(IPL_TYPE_FCP);
 597         else if (strncmp(buf, IPL_NSS_STR, strlen(IPL_NSS_STR)) == 0)
 598                 rc = reipl_set_type(IPL_TYPE_NSS);
 599         return (rc != 0) ? rc : len;
 600 }
 601
 602 static struct kobj_attribute reipl_type_attr =
 603                 __ATTR(reipl_type, 0644, reipl_type_show, reipl_type_store);
 604
 605 static struct kset *reipl_kset;
 606
 607 /*
 608  * dump section
 609  */
 610
 611 /* FCP dump device attributes */
 612
 613 DEFINE_IPL_ATTR_RW(dump_fcp, wwpn, "0x%016llx\n", "%016llx\n",
 614                    dump_block_fcp->ipl_info.fcp.wwpn);
 615 DEFINE_IPL_ATTR_RW(dump_fcp, lun, "0x%016llx\n", "%016llx\n",
 616                    dump_block_fcp->ipl_info.fcp.lun);
 617 DEFINE_IPL_ATTR_RW(dump_fcp, bootprog, "%lld\n", "%lld\n",
 618                    dump_block_fcp->ipl_info.fcp.bootprog);
 619 DEFINE_IPL_ATTR_RW(dump_fcp, br_lba, "%lld\n", "%lld\n",
 620                    dump_block_fcp->ipl_info.fcp.br_lba);
 621 DEFINE_IPL_ATTR_RW(dump_fcp, device, "0.0.%04llx\n", "0.0.%llx\n",
 622                    dump_block_fcp->ipl_info.fcp.devno);
 623
 624 static struct attribute *dump_fcp_attrs[] = {
 625         &sys_dump_fcp_device_attr.attr,
 626         &sys_dump_fcp_wwpn_attr.attr,
 627         &sys_dump_fcp_lun_attr.attr,
 628         &sys_dump_fcp_bootprog_attr.attr,
 629         &sys_dump_fcp_br_lba_attr.attr,
 630         NULL,
 631 };
 632
 633 static struct attribute_group dump_fcp_attr_group = {
 634         .name  = IPL_FCP_STR,
 635         .attrs = dump_fcp_attrs,
 636 };
 637
 638 /* CCW dump device attributes */
 639
 640 DEFINE_IPL_ATTR_RW(dump_ccw, device, "0.0.%04llx\n", "0.0.%llx\n",
 641                    dump_block_ccw->ipl_info.ccw.devno);
 642
 643 static struct attribute *dump_ccw_attrs[] = {
 644         &sys_dump_ccw_device_attr.attr,
 645         NULL,
 646 };
 647
 648 static struct attribute_group dump_ccw_attr_group = {
 649         .name  = IPL_CCW_STR,
 650         .attrs = dump_ccw_attrs,
 651 };
 652
 653 /* dump type */
 654
 655 static int dump_set_type(enum dump_type type)
 656 {
 657         if (!(dump_capabilities & type))
 658                 return -EINVAL;
 659         switch(type) {
 660         case DUMP_TYPE_CCW:
 661                 if (MACHINE_IS_VM)
 662                         dump_method = DUMP_METHOD_CCW_VM;
 663                 else if (diag308_set_works)
 664                         dump_method = DUMP_METHOD_CCW_DIAG;
 665                 else
 666                         dump_method = DUMP_METHOD_CCW_CIO;
 667                 break;
 668         case DUMP_TYPE_FCP:
 669                 dump_method = DUMP_METHOD_FCP_DIAG;
 670                 break;
 671         default:
 672                 dump_method = DUMP_METHOD_NONE;
 673         }
 674         dump_type = type;
 675         return 0;
 676 }
 677
 678 static ssize_t dump_type_show(struct kobject *kobj,
 679                               struct kobj_attribute *attr, char *page)
 680 {
 681         return sprintf(page, "%s\n", dump_type_str(dump_type));
 682 }
 683
 684 static ssize_t dump_type_store(struct kobject *kobj,
 685                                struct kobj_attribute *attr,
 686                                const char *buf, size_t len)
 687 {
 688         int rc = -EINVAL;
 689
 690         if (strncmp(buf, DUMP_NONE_STR, strlen(DUMP_NONE_STR)) == 0)
 691                 rc = dump_set_type(DUMP_TYPE_NONE);
 692         else if (strncmp(buf, DUMP_CCW_STR, strlen(DUMP_CCW_STR)) == 0)
 693                 rc = dump_set_type(DUMP_TYPE_CCW);
 694         else if (strncmp(buf, DUMP_FCP_STR, strlen(DUMP_FCP_STR)) == 0)
 695                 rc = dump_set_type(DUMP_TYPE_FCP);
 696         return (rc != 0) ? rc : len;
 697 }
 698
 699 static struct kobj_attribute dump_type_attr =
 700                 __ATTR(dump_type, 0644, dump_type_show, dump_type_store);
 701
 702 static struct kset *dump_kset;
 703
 704 /*
 705  * Shutdown actions section
 706  */
 707
 708 static struct kset *shutdown_actions_kset;
 709
 710 /* on panic */
 711
 712 static ssize_t on_panic_show(struct kobject *kobj,
 713                              struct kobj_attribute *attr, char *page)
 714 {
 715         return sprintf(page, "%s\n", shutdown_action_str(on_panic_action));
 716 }
 717
 718 static ssize_t on_panic_store(struct kobject *kobj,
 719                               struct kobj_attribute *attr,
 720                               const char *buf, size_t len)
 721 {
 722         if (strncmp(buf, SHUTDOWN_REIPL_STR, strlen(SHUTDOWN_REIPL_STR)) == 0)
 723                 on_panic_action = SHUTDOWN_REIPL;
 724         else if (strncmp(buf, SHUTDOWN_DUMP_STR,
 725                          strlen(SHUTDOWN_DUMP_STR)) == 0)
 726                 on_panic_action = SHUTDOWN_DUMP;
 727         else if (strncmp(buf, SHUTDOWN_STOP_STR,
 728                          strlen(SHUTDOWN_STOP_STR)) == 0)
 729                 on_panic_action = SHUTDOWN_STOP;
 730         else
 731                 return -EINVAL;
 732
 733         return len;
 734 }
 735
 736 static struct kobj_attribute on_panic_attr =
 737                 __ATTR(on_panic, 0644, on_panic_show, on_panic_store);
 738
 739 void do_reipl(void)
 740 {
 741         struct ccw_dev_id devid;
 742         static char buf[100];
 743         char loadparm[LOADPARM_LEN + 1];
 744
 745         switch (reipl_method) {
 746         case REIPL_METHOD_CCW_CIO:
 747                 devid.devno = reipl_block_ccw->ipl_info.ccw.devno;
 748                 if (ipl_info.type == IPL_TYPE_CCW && devid.devno == ipl_devno)
 749                         diag308(DIAG308_IPL, NULL);
 750                 devid.ssid  = 0;
 751                 reipl_ccw_dev(&devid);
 752                 break;
 753         case REIPL_METHOD_CCW_VM:
 754                 reipl_get_ascii_loadparm(loadparm);
 755                 if (strlen(loadparm) == 0)
 756                         sprintf(buf, "IPL %X CLEAR",
 757                                 reipl_block_ccw->ipl_info.ccw.devno);
 758                 else
 759                         sprintf(buf, "IPL %X CLEAR LOADPARM '%s'",
 760                                 reipl_block_ccw->ipl_info.ccw.devno, loadparm);
 761                 __cpcmd(buf, NULL, 0, NULL);
 762                 break;
 763         case REIPL_METHOD_CCW_DIAG:
 764                 diag308(DIAG308_SET, reipl_block_ccw);
 765                 diag308(DIAG308_IPL, NULL);
 766                 break;
 767         case REIPL_METHOD_FCP_RW_DIAG:
 768                 diag308(DIAG308_SET, reipl_block_fcp);
 769                 diag308(DIAG308_IPL, NULL);
 770                 break;
 771         case REIPL_METHOD_FCP_RO_DIAG:
 772                 diag308(DIAG308_IPL, NULL);
 773                 break;
 774         case REIPL_METHOD_FCP_RO_VM:
 775                 __cpcmd("IPL", NULL, 0, NULL);
 776                 break;
 777         case REIPL_METHOD_NSS:
 778                 sprintf(buf, "IPL %s", reipl_nss_name);
 779                 __cpcmd(buf, NULL, 0, NULL);
 780                 break;
 781         case REIPL_METHOD_DEFAULT:
 782                 if (MACHINE_IS_VM)
 783                         __cpcmd("IPL", NULL, 0, NULL);
 784                 diag308(DIAG308_IPL, NULL);
 785                 break;
 786         case REIPL_METHOD_FCP_DUMP:
 787         default:
 788                 break;
 789         }
 790         signal_processor(smp_processor_id(), sigp_stop_and_store_status);
 791 }
 792
 793 static void do_dump(void)
 794 {
 795         struct ccw_dev_id devid;
 796         static char buf[100];
 797
 798         switch (dump_method) {
 799         case DUMP_METHOD_CCW_CIO:
 800                 smp_send_stop();
 801                 devid.devno = dump_block_ccw->ipl_info.ccw.devno;
 802                 devid.ssid  = 0;
 803                 reipl_ccw_dev(&devid);
 804                 break;
 805         case DUMP_METHOD_CCW_VM:
 806                 smp_send_stop();
 807                 sprintf(buf, "STORE STATUS");
 808                 __cpcmd(buf, NULL, 0, NULL);
 809                 sprintf(buf, "IPL %X", dump_block_ccw->ipl_info.ccw.devno);
 810                 __cpcmd(buf, NULL, 0, NULL);
 811                 break;
 812         case DUMP_METHOD_CCW_DIAG:
 813                 diag308(DIAG308_SET, dump_block_ccw);
 814                 diag308(DIAG308_DUMP, NULL);
 815                 break;
 816         case DUMP_METHOD_FCP_DIAG:
 817                 diag308(DIAG308_SET, dump_block_fcp);
 818                 diag308(DIAG308_DUMP, NULL);
 819                 break;
 820         case DUMP_METHOD_NONE:
 821         default:
 822                 return;
 823         }
 824         printk(KERN_EMERG "Dump failed!\n");
 825 }
 826
 827 /* init functions */
 828
 829 static int __init ipl_register_fcp_files(void)
 830 {
 831         int rc;
 832
 833         rc = sysfs_create_group(&ipl_kset->kobj,
 834                                 &ipl_fcp_attr_group);
 835         if (rc)
 836                 goto out;
 837         rc = sysfs_create_bin_file(&ipl_kset->kobj,
 838                                    &ipl_parameter_attr);
 839         if (rc)
 840                 goto out_ipl_parm;
 841         rc = sysfs_create_bin_file(&ipl_kset->kobj,
 842                                    &ipl_scp_data_attr);
 843         if (!rc)
 844                 goto out;
 845
 846         sysfs_remove_bin_file(&ipl_kset->kobj, &ipl_parameter_attr);
 847
 848 out_ipl_parm:
 849         sysfs_remove_group(&ipl_kset->kobj, &ipl_fcp_attr_group);
 850 out:
 851         return rc;
 852 }
 853
 854 static int __init ipl_init(void)
 855 {
 856         int rc;
 857
 858         ipl_kset = kset_create_and_add("ipl", NULL, firmware_kobj);
 859         if (!ipl_kset)
 860                 return -ENOMEM;
 861         switch (ipl_info.type) {
 862         case IPL_TYPE_CCW:
 863                 rc = sysfs_create_group(&ipl_kset->kobj,
 864                                         &ipl_ccw_attr_group);
 865                 break;
 866         case IPL_TYPE_FCP:
 867         case IPL_TYPE_FCP_DUMP:
 868                 rc = ipl_register_fcp_files();
 869                 break;
 870         case IPL_TYPE_NSS:
 871                 rc = sysfs_create_group(&ipl_kset->kobj,
 872                                         &ipl_nss_attr_group);
 873                 break;
 874         default:
 875                 rc = sysfs_create_group(&ipl_kset->kobj,
 876                                         &ipl_unknown_attr_group);
 877                 break;
 878         }
 879         if (rc)
 880                 kset_unregister(ipl_kset);
 881         return rc;
 882 }
 883
 884 static void __init reipl_probe(void)
 885 {
 886         void *buffer;
 887
 888         buffer = (void *) get_zeroed_page(GFP_KERNEL);
 889         if (!buffer)
 890                 return;
 891         if (diag308(DIAG308_STORE, buffer) == DIAG308_RC_OK)
 892                 diag308_set_works = 1;
 893         free_page((unsigned long)buffer);
 894 }
 895
 896 static int __init reipl_nss_init(void)
 897 {
 898         int rc;
 899
 900         if (!MACHINE_IS_VM)
 901                 return 0;
 902         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_nss_attr_group);
 903         if (rc)
 904                 return rc;
 905         strncpy(reipl_nss_name, kernel_nss_name, NSS_NAME_SIZE + 1);
 906         reipl_capabilities |= IPL_TYPE_NSS;
 907         return 0;
 908 }
 909
 910 static int __init reipl_ccw_init(void)
 911 {
 912         int rc;
 913
 914         reipl_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
 915         if (!reipl_block_ccw)
 916                 return -ENOMEM;
 917         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_ccw_attr_group);
 918         if (rc) {
 919                 free_page((unsigned long)reipl_block_ccw);
 920                 return rc;
 921         }
 922         reipl_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
 923         reipl_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
 924         reipl_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
 925         reipl_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
 926         /* check if read scp info worked and set loadparm */
 927         if (sclp_ipl_info.is_valid)
 928                 memcpy(reipl_block_ccw->ipl_info.ccw.load_param,
 929                        &sclp_ipl_info.loadparm, LOADPARM_LEN);
 930         else
 931                 /* read scp info failed: set empty loadparm (EBCDIC blanks) */
 932                 memset(reipl_block_ccw->ipl_info.ccw.load_param, 0x40,
 933                        LOADPARM_LEN);
 934         /* FIXME: check for diag308_set_works when enabling diag ccw reipl */
 935         if (!MACHINE_IS_VM)
 936                 sys_reipl_ccw_loadparm_attr.attr.mode = S_IRUGO;
 937         if (ipl_info.type == IPL_TYPE_CCW)
 938                 reipl_block_ccw->ipl_info.ccw.devno = ipl_devno;
 939         reipl_capabilities |= IPL_TYPE_CCW;
 940         return 0;
 941 }
 942
 943 static int __init reipl_fcp_init(void)
 944 {
 945         int rc;
 946
 947         if ((!diag308_set_works) && (ipl_info.type != IPL_TYPE_FCP))
 948                 return 0;
 949         if ((!diag308_set_works) && (ipl_info.type == IPL_TYPE_FCP))
 950                 make_attrs_ro(reipl_fcp_attrs);
 951
 952         reipl_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
 953         if (!reipl_block_fcp)
 954                 return -ENOMEM;
 955         rc = sysfs_create_group(&reipl_kset->kobj, &reipl_fcp_attr_group);
 956         if (rc) {
 957                 free_page((unsigned long)reipl_block_fcp);
 958                 return rc;
 959         }
 960         if (ipl_info.type == IPL_TYPE_FCP) {
 961                 memcpy(reipl_block_fcp, IPL_PARMBLOCK_START, PAGE_SIZE);
 962         } else {
 963                 reipl_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
 964                 reipl_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
 965                 reipl_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
 966                 reipl_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
 967                 reipl_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_IPL;
 968         }
 969         reipl_capabilities |= IPL_TYPE_FCP;
 970         return 0;
 971 }
 972
 973 static int __init reipl_init(void)
 974 {
 975         int rc;
 976
 977         reipl_kset = kset_create_and_add("reipl", NULL, firmware_kobj);
 978         if (!reipl_kset)
 979                 return -ENOMEM;
 980         rc = sysfs_create_file(&reipl_kset->kobj, &reipl_type_attr.attr);
 981         if (rc) {
 982                 kset_unregister(reipl_kset);
 983                 return rc;
 984         }
 985         rc = reipl_ccw_init();
 986         if (rc)
 987                 return rc;
 988         rc = reipl_fcp_init();
 989         if (rc)
 990                 return rc;
 991         rc = reipl_nss_init();
 992         if (rc)
 993                 return rc;
 994         rc = reipl_set_type(ipl_info.type);
 995         if (rc)
 996                 return rc;
 997         return 0;
 998 }
 999
1000 static int __init dump_ccw_init(void)
1001 {
1002         int rc;
1003
1004         dump_block_ccw = (void *) get_zeroed_page(GFP_KERNEL);
1005         if (!dump_block_ccw)
1006                 return -ENOMEM;
1007         rc = sysfs_create_group(&dump_kset->kobj, &dump_ccw_attr_group);
1008         if (rc) {
1009                 free_page((unsigned long)dump_block_ccw);
1010                 return rc;
1011         }
1012         dump_block_ccw->hdr.len = IPL_PARM_BLK_CCW_LEN;
1013         dump_block_ccw->hdr.version = IPL_PARM_BLOCK_VERSION;
1014         dump_block_ccw->hdr.blk0_len = IPL_PARM_BLK0_CCW_LEN;
1015         dump_block_ccw->hdr.pbt = DIAG308_IPL_TYPE_CCW;
1016         dump_capabilities |= DUMP_TYPE_CCW;
1017         return 0;
1018 }
1019
1020 static int __init dump_fcp_init(void)
1021 {
1022         int rc;
1023
1024         if (!sclp_ipl_info.has_dump)
1025                 return 0; /* LDIPL DUMP is not installed */
1026         if (!diag308_set_works)
1027                 return 0;
1028         dump_block_fcp = (void *) get_zeroed_page(GFP_KERNEL);
1029         if (!dump_block_fcp)
1030                 return -ENOMEM;
1031         rc = sysfs_create_group(&dump_kset->kobj, &dump_fcp_attr_group);
1032         if (rc) {
1033                 free_page((unsigned long)dump_block_fcp);
1034                 return rc;
1035         }
1036         dump_block_fcp->hdr.len = IPL_PARM_BLK_FCP_LEN;
1037         dump_block_fcp->hdr.version = IPL_PARM_BLOCK_VERSION;
1038         dump_block_fcp->hdr.blk0_len = IPL_PARM_BLK0_FCP_LEN;
1039         dump_block_fcp->hdr.pbt = DIAG308_IPL_TYPE_FCP;
1040         dump_block_fcp->ipl_info.fcp.opt = DIAG308_IPL_OPT_DUMP;
1041         dump_capabilities |= DUMP_TYPE_FCP;
1042         return 0;
1043 }
1044
1045 #define SHUTDOWN_ON_PANIC_PRIO 0
1046
1047 static int shutdown_on_panic_notify(struct notifier_block *self,
1048                                     unsigned long event, void *data)
1049 {
1050         if (on_panic_action == SHUTDOWN_DUMP)
1051                 do_dump();
1052         else if (on_panic_action == SHUTDOWN_REIPL)
1053                 do_reipl();
1054         return NOTIFY_OK;
1055 }
1056
1057 static struct notifier_block shutdown_on_panic_nb = {
1058         .notifier_call = shutdown_on_panic_notify,
1059         .priority = SHUTDOWN_ON_PANIC_PRIO
1060 };
1061
1062 static int __init dump_init(void)
1063 {
1064         int rc;
1065
1066         dump_kset = kset_create_and_add("dump", NULL, firmware_kobj);
1067         if (!dump_kset)
1068                 return -ENOMEM;
1069         rc = sysfs_create_file(&dump_kset->kobj, &dump_type_attr);
1070         if (rc) {
1071                 kset_unregister(dump_kset);
1072                 return rc;
1073         }
1074         rc = dump_ccw_init();
1075         if (rc)
1076                 return rc;
1077         rc = dump_fcp_init();
1078         if (rc)
1079                 return rc;
1080         dump_set_type(DUMP_TYPE_NONE);
1081         return 0;
1082 }
1083
1084 static int __init shutdown_actions_init(void)
1085 {
1086         int rc;
1087
1088         shutdown_actions_kset = kset_create_and_add("shutdown_actions", NULL,
1089                                                     firmware_kobj);
1090         if (!shutdown_actions_kset)
1091                 return -ENOMEM;
1092         rc = sysfs_create_file(&shutdown_actions_kset->kobj, &on_panic_attr);
1093         if (rc) {
1094                 kset_unregister(shutdown_actions_kset);
1095                 return rc;
1096         }
1097         atomic_notifier_chain_register(&panic_notifier_list,
1098                                        &shutdown_on_panic_nb);
1099         return 0;
1100 }
1101
1102 static int __init s390_ipl_init(void)
1103 {
1104         int rc;
1105
1106         sclp_get_ipl_info(&sclp_ipl_info);
1107         reipl_probe();
1108         rc = ipl_init();
1109         if (rc)
1110                 return rc;
1111         rc = reipl_init();
1112         if (rc)
1113                 return rc;
1114         rc = dump_init();
1115         if (rc)
1116                 return rc;
1117         rc = shutdown_actions_init();
1118         if (rc)
1119                 return rc;
1120         return 0;
1121 }
1122
1123 __initcall(s390_ipl_init);
1124
1125 void __init ipl_save_parameters(void)
1126 {
1127         struct cio_iplinfo iplinfo;
1128         unsigned int *ipl_ptr;
1129         void *src, *dst;
1130
1131         if (cio_get_iplinfo(&iplinfo))
1132                 return;
1133
1134         ipl_devno = iplinfo.devno;
1135         ipl_flags |= IPL_DEVNO_VALID;
1136         if (!iplinfo.is_qdio)
1137                 return;
1138         ipl_flags |= IPL_PARMBLOCK_VALID;
1139         ipl_ptr = (unsigned int *)__LC_IPL_PARMBLOCK_PTR;
1140         src = (void *)(unsigned long)*ipl_ptr;
1141         dst = (void *)IPL_PARMBLOCK_ORIGIN;
1142         memmove(dst, src, PAGE_SIZE);
1143         *ipl_ptr = IPL_PARMBLOCK_ORIGIN;
1144 }
1145
1146 static LIST_HEAD(rcall);
1147 static DEFINE_MUTEX(rcall_mutex);
1148
1149 void register_reset_call(struct reset_call *reset)
1150 {
1151         mutex_lock(&rcall_mutex);
1152         list_add(&reset->list, &rcall);
1153         mutex_unlock(&rcall_mutex);
1154 }
1155 EXPORT_SYMBOL_GPL(register_reset_call);
1156
1157 void unregister_reset_call(struct reset_call *reset)
1158 {
1159         mutex_lock(&rcall_mutex);
1160         list_del(&reset->list);
1161         mutex_unlock(&rcall_mutex);
1162 }
1163 EXPORT_SYMBOL_GPL(unregister_reset_call);
1164
1165 static void do_reset_calls(void)
1166 {
1167         struct reset_call *reset;
1168
1169         list_for_each_entry(reset, &rcall, list)
1170                 reset->fn();
1171 }
1172
1173 u32 dump_prefix_page;
1174
1175 void s390_reset_system(void)
1176 {
1177         struct _lowcore *lc;
1178
1179         lc = (struct _lowcore *)(unsigned long) store_prefix();
1180
1181         /* Stack for interrupt/machine check handler */
1182         lc->panic_stack = S390_lowcore.panic_stack;
1183
1184         /* Save prefix page address for dump case */
1185         dump_prefix_page = (u32)(unsigned long) lc;
1186
1187         /* Disable prefixing */
1188         set_prefix(0);
1189
1190         /* Disable lowcore protection */
1191         __ctl_clear_bit(0,28);
1192
1193         /* Set new machine check handler */
1194         S390_lowcore.mcck_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1195         S390_lowcore.mcck_new_psw.addr =
1196                 PSW_ADDR_AMODE | (unsigned long) s390_base_mcck_handler;
1197
1198         /* Set new program check handler */
1199         S390_lowcore.program_new_psw.mask = psw_kernel_bits & ~PSW_MASK_MCHECK;
1200         S390_lowcore.program_new_psw.addr =
1201                 PSW_ADDR_AMODE | (unsigned long) s390_base_pgm_handler;
1202
1203         do_reset_calls();
1204 }