1/* 2 * zcore module to export memory content and register sets for creating system 3 * dumps on SCSI disks (zfcpdump). The "zcore/mem" debugfs file shows the same 4 * dump format as s390 standalone dumps. 5 * 6 * For more information please refer to Documentation/s390/zfcpdump.txt 7 * 8 * Copyright IBM Corp. 2003, 2008 9 * Author(s): Michael Holzheu 10 */ 11 12#define KMSG_COMPONENT "zdump" 13#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 14 15#include <linux/init.h> 16#include <linux/slab.h> 17#include <linux/miscdevice.h> 18#include <linux/debugfs.h> 19#include <linux/module.h> 20#include <linux/memblock.h> 21 22#include <asm/asm-offsets.h> 23#include <asm/ipl.h> 24#include <asm/sclp.h> 25#include <asm/setup.h> 26#include <asm/uaccess.h> 27#include <asm/debug.h> 28#include <asm/processor.h> 29#include <asm/irqflags.h> 30#include <asm/checksum.h> 31#include <asm/switch_to.h> 32#include "sclp.h" 33 34#define TRACE(x...) debug_sprintf_event(zcore_dbf, 1, x) 35 36#define TO_USER 1 37#define TO_KERNEL 0 38#define CHUNK_INFO_SIZE 34 /* 2 16-byte char, each followed by blank */ 39 40enum arch_id { 41 ARCH_S390 = 0, 42 ARCH_S390X = 1, 43}; 44 45/* dump system info */ 46 47struct sys_info { 48 enum arch_id arch; 49 unsigned long sa_base; 50 u32 sa_size; 51 int cpu_map[NR_CPUS]; 52 unsigned long mem_size; 53 struct save_area lc_mask; 54}; 55 56struct ipib_info { 57 unsigned long ipib; 58 u32 checksum; 59} __attribute__((packed)); 60 61static struct sys_info sys_info; 62static struct debug_info *zcore_dbf; 63static int hsa_available; 64static struct dentry *zcore_dir; 65static struct dentry *zcore_file; 66static struct dentry *zcore_memmap_file; 67static struct dentry *zcore_reipl_file; 68static struct dentry *zcore_hsa_file; 69static struct ipl_parameter_block *ipl_block; 70 71/* 72 * Copy memory from HSA to kernel or user memory (not reentrant): 73 * 74 * @dest: Kernel or user buffer where memory should be copied to 75 * @src: Start address within HSA where data should be copied 76 * @count: Size of buffer, which should be copied 77 * @mode: Either TO_KERNEL or TO_USER 78 */ 79int memcpy_hsa(void *dest, unsigned long src, size_t count, int mode) 80{ 81 int offs, blk_num; 82 static char buf[PAGE_SIZE] __attribute__((__aligned__(PAGE_SIZE))); 83 84 if (!hsa_available) 85 return -ENODATA; 86 if (count == 0) 87 return 0; 88 89 /* copy first block */ 90 offs = 0; 91 if ((src % PAGE_SIZE) != 0) { 92 blk_num = src / PAGE_SIZE + 2; 93 if (sclp_sdias_copy(buf, blk_num, 1)) { 94 TRACE("sclp_sdias_copy() failed\n"); 95 return -EIO; 96 } 97 offs = min((PAGE_SIZE - (src % PAGE_SIZE)), count); 98 if (mode == TO_USER) { 99 if (copy_to_user((__force __user void*) dest, 100 buf + (src % PAGE_SIZE), offs)) 101 return -EFAULT; 102 } else 103 memcpy(dest, buf + (src % PAGE_SIZE), offs); 104 } 105 if (offs == count) 106 goto out; 107 108 /* copy middle */ 109 for (; (offs + PAGE_SIZE) <= count; offs += PAGE_SIZE) { 110 blk_num = (src + offs) / PAGE_SIZE + 2; 111 if (sclp_sdias_copy(buf, blk_num, 1)) { 112 TRACE("sclp_sdias_copy() failed\n"); 113 return -EIO; 114 } 115 if (mode == TO_USER) { 116 if (copy_to_user((__force __user void*) dest + offs, 117 buf, PAGE_SIZE)) 118 return -EFAULT; 119 } else 120 memcpy(dest + offs, buf, PAGE_SIZE); 121 } 122 if (offs == count) 123 goto out; 124 125 /* copy last block */ 126 blk_num = (src + offs) / PAGE_SIZE + 2; 127 if (sclp_sdias_copy(buf, blk_num, 1)) { 128 TRACE("sclp_sdias_copy() failed\n"); 129 return -EIO; 130 } 131 if (mode == TO_USER) { 132 if (copy_to_user((__force __user void*) dest + offs, buf, 133 count - offs)) 134 return -EFAULT; 135 } else 136 memcpy(dest + offs, buf, count - offs); 137out: 138 return 0; 139} 140 141static int memcpy_hsa_user(void __user *dest, unsigned long src, size_t count) 142{ 143 return memcpy_hsa((void __force *) dest, src, count, TO_USER); 144} 145 146static int memcpy_hsa_kernel(void *dest, unsigned long src, size_t count) 147{ 148 return memcpy_hsa(dest, src, count, TO_KERNEL); 149} 150 151static int __init init_cpu_info(enum arch_id arch) 152{ 153 struct save_area_ext *sa_ext; 154 155 /* get info for boot cpu from lowcore, stored in the HSA */ 156 157 sa_ext = dump_save_areas.areas[0]; 158 if (!sa_ext) 159 return -ENOMEM; 160 if (memcpy_hsa_kernel(&sa_ext->sa, sys_info.sa_base, 161 sys_info.sa_size) < 0) { 162 TRACE("could not copy from HSA\n"); 163 kfree(sa_ext); 164 return -EIO; 165 } 166 if (MACHINE_HAS_VX) 167 save_vx_regs_safe(sa_ext->vx_regs); 168 return 0; 169} 170 171static DEFINE_MUTEX(zcore_mutex); 172 173#define DUMP_VERSION 0x5 174#define DUMP_MAGIC 0xa8190173618f23fdULL 175#define DUMP_ARCH_S390X 2 176#define DUMP_ARCH_S390 1 177#define HEADER_SIZE 4096 178 179/* dump header dumped according to s390 crash dump format */ 180 181struct zcore_header { 182 u64 magic; 183 u32 version; 184 u32 header_size; 185 u32 dump_level; 186 u32 page_size; 187 u64 mem_size; 188 u64 mem_start; 189 u64 mem_end; 190 u32 num_pages; 191 u32 pad1; 192 u64 tod; 193 struct cpuid cpu_id; 194 u32 arch_id; 195 u32 volnr; 196 u32 build_arch; 197 u64 rmem_size; 198 u8 mvdump; 199 u16 cpu_cnt; 200 u16 real_cpu_cnt; 201 u8 end_pad1[0x200-0x061]; 202 u64 mvdump_sign; 203 u64 mvdump_zipl_time; 204 u8 end_pad2[0x800-0x210]; 205 u32 lc_vec[512]; 206} __attribute__((packed,__aligned__(16))); 207 208static struct zcore_header zcore_header = { 209 .magic = DUMP_MAGIC, 210 .version = DUMP_VERSION, 211 .header_size = 4096, 212 .dump_level = 0, 213 .page_size = PAGE_SIZE, 214 .mem_start = 0, 215 .build_arch = DUMP_ARCH_S390X, 216}; 217 218/* 219 * Copy lowcore info to buffer. Use map in order to copy only register parts. 220 * 221 * @buf: User buffer 222 * @sa: Pointer to save area 223 * @sa_off: Offset in save area to copy 224 * @len: Number of bytes to copy 225 */ 226static int copy_lc(void __user *buf, void *sa, int sa_off, int len) 227{ 228 int i; 229 char *lc_mask = (char*)&sys_info.lc_mask; 230 231 for (i = 0; i < len; i++) { 232 if (!lc_mask[i + sa_off]) 233 continue; 234 if (copy_to_user(buf + i, sa + sa_off + i, 1)) 235 return -EFAULT; 236 } 237 return 0; 238} 239 240/* 241 * Copy lowcores info to memory, if necessary 242 * 243 * @buf: User buffer 244 * @addr: Start address of buffer in dump memory 245 * @count: Size of buffer 246 */ 247static int zcore_add_lc(char __user *buf, unsigned long start, size_t count) 248{ 249 unsigned long end; 250 int i; 251 252 if (count == 0) 253 return 0; 254 255 end = start + count; 256 for (i = 0; i < dump_save_areas.count; i++) { 257 unsigned long cp_start, cp_end; /* copy range */ 258 unsigned long sa_start, sa_end; /* save area range */ 259 unsigned long prefix; 260 unsigned long sa_off, len, buf_off; 261 struct save_area *save_area = &dump_save_areas.areas[i]->sa; 262 263 prefix = save_area->pref_reg; 264 sa_start = prefix + sys_info.sa_base; 265 sa_end = prefix + sys_info.sa_base + sys_info.sa_size; 266 267 if ((end < sa_start) || (start > sa_end)) 268 continue; 269 cp_start = max(start, sa_start); 270 cp_end = min(end, sa_end); 271 272 buf_off = cp_start - start; 273 sa_off = cp_start - sa_start; 274 len = cp_end - cp_start; 275 276 TRACE("copy_lc for: %lx\n", start); 277 if (copy_lc(buf + buf_off, save_area, sa_off, len)) 278 return -EFAULT; 279 } 280 return 0; 281} 282 283/* 284 * Release the HSA 285 */ 286static void release_hsa(void) 287{ 288 diag308(DIAG308_REL_HSA, NULL); 289 hsa_available = 0; 290} 291 292/* 293 * Read routine for zcore character device 294 * First 4K are dump header 295 * Next 32MB are HSA Memory 296 * Rest is read from absolute Memory 297 */ 298static ssize_t zcore_read(struct file *file, char __user *buf, size_t count, 299 loff_t *ppos) 300{ 301 unsigned long mem_start; /* Start address in memory */ 302 size_t mem_offs; /* Offset in dump memory */ 303 size_t hdr_count; /* Size of header part of output buffer */ 304 size_t size; 305 int rc; 306 307 mutex_lock(&zcore_mutex); 308 309 if (*ppos > (sys_info.mem_size + HEADER_SIZE)) { 310 rc = -EINVAL; 311 goto fail; 312 } 313 314 count = min(count, (size_t) (sys_info.mem_size + HEADER_SIZE - *ppos)); 315 316 /* Copy dump header */ 317 if (*ppos < HEADER_SIZE) { 318 size = min(count, (size_t) (HEADER_SIZE - *ppos)); 319 if (copy_to_user(buf, &zcore_header + *ppos, size)) { 320 rc = -EFAULT; 321 goto fail; 322 } 323 hdr_count = size; 324 mem_start = 0; 325 } else { 326 hdr_count = 0; 327 mem_start = *ppos - HEADER_SIZE; 328 } 329 330 mem_offs = 0; 331 332 /* Copy from HSA data */ 333 if (*ppos < sclp.hsa_size + HEADER_SIZE) { 334 size = min((count - hdr_count), 335 (size_t) (sclp.hsa_size - mem_start)); 336 rc = memcpy_hsa_user(buf + hdr_count, mem_start, size); 337 if (rc) 338 goto fail; 339 340 mem_offs += size; 341 } 342 343 /* Copy from real mem */ 344 size = count - mem_offs - hdr_count; 345 rc = copy_to_user_real(buf + hdr_count + mem_offs, 346 (void *) mem_start + mem_offs, size); 347 if (rc) 348 goto fail; 349 350 /* 351 * Since s390 dump analysis tools like lcrash or crash 352 * expect register sets in the prefix pages of the cpus, 353 * we copy them into the read buffer, if necessary. 354 * buf + hdr_count: Start of memory part of output buffer 355 * mem_start: Start memory address to copy from 356 * count - hdr_count: Size of memory area to copy 357 */ 358 if (zcore_add_lc(buf + hdr_count, mem_start, count - hdr_count)) { 359 rc = -EFAULT; 360 goto fail; 361 } 362 *ppos += count; 363fail: 364 mutex_unlock(&zcore_mutex); 365 return (rc < 0) ? rc : count; 366} 367 368static int zcore_open(struct inode *inode, struct file *filp) 369{ 370 if (!hsa_available) 371 return -ENODATA; 372 else 373 return capable(CAP_SYS_RAWIO) ? 0 : -EPERM; 374} 375 376static int zcore_release(struct inode *inode, struct file *filep) 377{ 378 if (hsa_available) 379 release_hsa(); 380 return 0; 381} 382 383static loff_t zcore_lseek(struct file *file, loff_t offset, int orig) 384{ 385 loff_t rc; 386 387 mutex_lock(&zcore_mutex); 388 switch (orig) { 389 case 0: 390 file->f_pos = offset; 391 rc = file->f_pos; 392 break; 393 case 1: 394 file->f_pos += offset; 395 rc = file->f_pos; 396 break; 397 default: 398 rc = -EINVAL; 399 } 400 mutex_unlock(&zcore_mutex); 401 return rc; 402} 403 404static const struct file_operations zcore_fops = { 405 .owner = THIS_MODULE, 406 .llseek = zcore_lseek, 407 .read = zcore_read, 408 .open = zcore_open, 409 .release = zcore_release, 410}; 411 412static ssize_t zcore_memmap_read(struct file *filp, char __user *buf, 413 size_t count, loff_t *ppos) 414{ 415 return simple_read_from_buffer(buf, count, ppos, filp->private_data, 416 memblock.memory.cnt * CHUNK_INFO_SIZE); 417} 418 419static int zcore_memmap_open(struct inode *inode, struct file *filp) 420{ 421 struct memblock_region *reg; 422 char *buf; 423 int i = 0; 424 425 buf = kzalloc(memblock.memory.cnt * CHUNK_INFO_SIZE, GFP_KERNEL); 426 if (!buf) { 427 return -ENOMEM; 428 } 429 for_each_memblock(memory, reg) { 430 sprintf(buf + (i++ * CHUNK_INFO_SIZE), "%016llx %016llx ", 431 (unsigned long long) reg->base, 432 (unsigned long long) reg->size); 433 } 434 filp->private_data = buf; 435 return nonseekable_open(inode, filp); 436} 437 438static int zcore_memmap_release(struct inode *inode, struct file *filp) 439{ 440 kfree(filp->private_data); 441 return 0; 442} 443 444static const struct file_operations zcore_memmap_fops = { 445 .owner = THIS_MODULE, 446 .read = zcore_memmap_read, 447 .open = zcore_memmap_open, 448 .release = zcore_memmap_release, 449 .llseek = no_llseek, 450}; 451 452static ssize_t zcore_reipl_write(struct file *filp, const char __user *buf, 453 size_t count, loff_t *ppos) 454{ 455 if (ipl_block) { 456 diag308(DIAG308_SET, ipl_block); 457 diag308(DIAG308_IPL, NULL); 458 } 459 return count; 460} 461 462static int zcore_reipl_open(struct inode *inode, struct file *filp) 463{ 464 return nonseekable_open(inode, filp); 465} 466 467static int zcore_reipl_release(struct inode *inode, struct file *filp) 468{ 469 return 0; 470} 471 472static const struct file_operations zcore_reipl_fops = { 473 .owner = THIS_MODULE, 474 .write = zcore_reipl_write, 475 .open = zcore_reipl_open, 476 .release = zcore_reipl_release, 477 .llseek = no_llseek, 478}; 479 480static ssize_t zcore_hsa_read(struct file *filp, char __user *buf, 481 size_t count, loff_t *ppos) 482{ 483 static char str[18]; 484 485 if (hsa_available) 486 snprintf(str, sizeof(str), "%lx\n", sclp.hsa_size); 487 else 488 snprintf(str, sizeof(str), "0\n"); 489 return simple_read_from_buffer(buf, count, ppos, str, strlen(str)); 490} 491 492static ssize_t zcore_hsa_write(struct file *filp, const char __user *buf, 493 size_t count, loff_t *ppos) 494{ 495 char value; 496 497 if (*ppos != 0) 498 return -EPIPE; 499 if (copy_from_user(&value, buf, 1)) 500 return -EFAULT; 501 if (value != '0') 502 return -EINVAL; 503 release_hsa(); 504 return count; 505} 506 507static const struct file_operations zcore_hsa_fops = { 508 .owner = THIS_MODULE, 509 .write = zcore_hsa_write, 510 .read = zcore_hsa_read, 511 .open = nonseekable_open, 512 .llseek = no_llseek, 513}; 514 515static void __init set_lc_mask(struct save_area *map) 516{ 517 memset(&map->fp_regs, 0xff, sizeof(map->fp_regs)); 518 memset(&map->gp_regs, 0xff, sizeof(map->gp_regs)); 519 memset(&map->psw, 0xff, sizeof(map->psw)); 520 memset(&map->pref_reg, 0xff, sizeof(map->pref_reg)); 521 memset(&map->fp_ctrl_reg, 0xff, sizeof(map->fp_ctrl_reg)); 522 memset(&map->tod_reg, 0xff, sizeof(map->tod_reg)); 523 memset(&map->timer, 0xff, sizeof(map->timer)); 524 memset(&map->clk_cmp, 0xff, sizeof(map->clk_cmp)); 525 memset(&map->acc_regs, 0xff, sizeof(map->acc_regs)); 526 memset(&map->ctrl_regs, 0xff, sizeof(map->ctrl_regs)); 527} 528 529/* 530 * Initialize dump globals for a given architecture 531 */ 532static int __init sys_info_init(enum arch_id arch, unsigned long mem_end) 533{ 534 int rc; 535 536 switch (arch) { 537 case ARCH_S390X: 538 pr_alert("DETECTED 'S390X (64 bit) OS'\n"); 539 break; 540 case ARCH_S390: 541 pr_alert("DETECTED 'S390 (32 bit) OS'\n"); 542 break; 543 default: 544 pr_alert("0x%x is an unknown architecture.\n",arch); 545 return -EINVAL; 546 } 547 sys_info.sa_base = SAVE_AREA_BASE; 548 sys_info.sa_size = sizeof(struct save_area); 549 sys_info.arch = arch; 550 set_lc_mask(&sys_info.lc_mask); 551 rc = init_cpu_info(arch); 552 if (rc) 553 return rc; 554 sys_info.mem_size = mem_end; 555 556 return 0; 557} 558 559static int __init check_sdias(void) 560{ 561 if (!sclp.hsa_size) { 562 TRACE("Could not determine HSA size\n"); 563 return -ENODEV; 564 } 565 return 0; 566} 567 568static int __init get_mem_info(unsigned long *mem, unsigned long *end) 569{ 570 struct memblock_region *reg; 571 572 for_each_memblock(memory, reg) { 573 *mem += reg->size; 574 *end = max_t(unsigned long, *end, reg->base + reg->size); 575 } 576 return 0; 577} 578 579static void __init zcore_header_init(int arch, struct zcore_header *hdr, 580 unsigned long mem_size) 581{ 582 u32 prefix; 583 int i; 584 585 if (arch == ARCH_S390X) 586 hdr->arch_id = DUMP_ARCH_S390X; 587 else 588 hdr->arch_id = DUMP_ARCH_S390; 589 hdr->mem_size = mem_size; 590 hdr->rmem_size = mem_size; 591 hdr->mem_end = sys_info.mem_size; 592 hdr->num_pages = mem_size / PAGE_SIZE; 593 hdr->tod = get_tod_clock(); 594 get_cpu_id(&hdr->cpu_id); 595 for (i = 0; i < dump_save_areas.count; i++) { 596 prefix = dump_save_areas.areas[i]->sa.pref_reg; 597 hdr->real_cpu_cnt++; 598 if (!prefix) 599 continue; 600 hdr->lc_vec[hdr->cpu_cnt] = prefix; 601 hdr->cpu_cnt++; 602 } 603} 604 605/* 606 * Provide IPL parameter information block from either HSA or memory 607 * for future reipl 608 */ 609static int __init zcore_reipl_init(void) 610{ 611 struct ipib_info ipib_info; 612 int rc; 613 614 rc = memcpy_hsa_kernel(&ipib_info, __LC_DUMP_REIPL, sizeof(ipib_info)); 615 if (rc) 616 return rc; 617 if (ipib_info.ipib == 0) 618 return 0; 619 ipl_block = (void *) __get_free_page(GFP_KERNEL); 620 if (!ipl_block) 621 return -ENOMEM; 622 if (ipib_info.ipib < sclp.hsa_size) 623 rc = memcpy_hsa_kernel(ipl_block, ipib_info.ipib, PAGE_SIZE); 624 else 625 rc = memcpy_real(ipl_block, (void *) ipib_info.ipib, PAGE_SIZE); 626 if (rc || csum_partial(ipl_block, ipl_block->hdr.len, 0) != 627 ipib_info.checksum) { 628 TRACE("Checksum does not match\n"); 629 free_page((unsigned long) ipl_block); 630 ipl_block = NULL; 631 } 632 return 0; 633} 634 635static int __init zcore_init(void) 636{ 637 unsigned long mem_size, mem_end; 638 unsigned char arch; 639 int rc; 640 641 mem_size = mem_end = 0; 642 if (ipl_info.type != IPL_TYPE_FCP_DUMP) 643 return -ENODATA; 644 if (OLDMEM_BASE) 645 return -ENODATA; 646 647 zcore_dbf = debug_register("zcore", 4, 1, 4 * sizeof(long)); 648 debug_register_view(zcore_dbf, &debug_sprintf_view); 649 debug_set_level(zcore_dbf, 6); 650 651 TRACE("devno: %x\n", ipl_info.data.fcp.dev_id.devno); 652 TRACE("wwpn: %llx\n", (unsigned long long) ipl_info.data.fcp.wwpn); 653 TRACE("lun: %llx\n", (unsigned long long) ipl_info.data.fcp.lun); 654 655 rc = sclp_sdias_init(); 656 if (rc) 657 goto fail; 658 659 rc = check_sdias(); 660 if (rc) 661 goto fail; 662 hsa_available = 1; 663 664 rc = memcpy_hsa_kernel(&arch, __LC_AR_MODE_ID, 1); 665 if (rc) 666 goto fail; 667 668 if (arch == ARCH_S390) { 669 pr_alert("The 64-bit dump tool cannot be used for a " 670 "32-bit system\n"); 671 rc = -EINVAL; 672 goto fail; 673 } 674 675 rc = get_mem_info(&mem_size, &mem_end); 676 if (rc) 677 goto fail; 678 679 rc = sys_info_init(arch, mem_end); 680 if (rc) 681 goto fail; 682 zcore_header_init(arch, &zcore_header, mem_size); 683 684 rc = zcore_reipl_init(); 685 if (rc) 686 goto fail; 687 688 zcore_dir = debugfs_create_dir("zcore" , NULL); 689 if (!zcore_dir) { 690 rc = -ENOMEM; 691 goto fail; 692 } 693 zcore_file = debugfs_create_file("mem", S_IRUSR, zcore_dir, NULL, 694 &zcore_fops); 695 if (!zcore_file) { 696 rc = -ENOMEM; 697 goto fail_dir; 698 } 699 zcore_memmap_file = debugfs_create_file("memmap", S_IRUSR, zcore_dir, 700 NULL, &zcore_memmap_fops); 701 if (!zcore_memmap_file) { 702 rc = -ENOMEM; 703 goto fail_file; 704 } 705 zcore_reipl_file = debugfs_create_file("reipl", S_IRUSR, zcore_dir, 706 NULL, &zcore_reipl_fops); 707 if (!zcore_reipl_file) { 708 rc = -ENOMEM; 709 goto fail_memmap_file; 710 } 711 zcore_hsa_file = debugfs_create_file("hsa", S_IRUSR|S_IWUSR, zcore_dir, 712 NULL, &zcore_hsa_fops); 713 if (!zcore_hsa_file) { 714 rc = -ENOMEM; 715 goto fail_reipl_file; 716 } 717 return 0; 718 719fail_reipl_file: 720 debugfs_remove(zcore_reipl_file); 721fail_memmap_file: 722 debugfs_remove(zcore_memmap_file); 723fail_file: 724 debugfs_remove(zcore_file); 725fail_dir: 726 debugfs_remove(zcore_dir); 727fail: 728 diag308(DIAG308_REL_HSA, NULL); 729 return rc; 730} 731 732static void __exit zcore_exit(void) 733{ 734 debug_unregister(zcore_dbf); 735 sclp_sdias_exit(); 736 free_page((unsigned long) ipl_block); 737 debugfs_remove(zcore_hsa_file); 738 debugfs_remove(zcore_reipl_file); 739 debugfs_remove(zcore_memmap_file); 740 debugfs_remove(zcore_file); 741 debugfs_remove(zcore_dir); 742 diag308(DIAG308_REL_HSA, NULL); 743} 744 745MODULE_AUTHOR("Copyright IBM Corp. 2003,2008"); 746MODULE_DESCRIPTION("zcore module for zfcpdump support"); 747MODULE_LICENSE("GPL"); 748 749subsys_initcall(zcore_init); 750module_exit(zcore_exit); 751