/drivers/ieee1394/sbp2.h

https://bitbucket.org/evzijst/gittest · C Header · 484 lines · 308 code · 73 blank · 103 comment · 0 complexity · df250fbfb41f76d99892f9025b64d6f8 MD5 · raw file

  1. /*
  2. * sbp2.h - Defines and prototypes for sbp2.c
  3. *
  4. * Copyright (C) 2000 James Goodwin, Filanet Corporation (www.filanet.com)
  5. * jamesg@filanet.com
  6. *
  7. * This program is free software; you can redistribute it and/or modify
  8. * it under the terms of the GNU General Public License as published by
  9. * the Free Software Foundation; either version 2 of the License, or
  10. * (at your option) any later version.
  11. *
  12. * This program is distributed in the hope that it will be useful,
  13. * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14. * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  15. * GNU General Public License for more details.
  16. *
  17. * You should have received a copy of the GNU General Public License
  18. * along with this program; if not, write to the Free Software Foundation,
  19. * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20. */
  21. #ifndef SBP2_H
  22. #define SBP2_H
  23. #define SBP2_DEVICE_NAME "sbp2"
  24. /*
  25. * SBP2 specific structures and defines
  26. */
  27. #define ORB_DIRECTION_WRITE_TO_MEDIA 0x0
  28. #define ORB_DIRECTION_READ_FROM_MEDIA 0x1
  29. #define ORB_DIRECTION_NO_DATA_TRANSFER 0x2
  30. #define ORB_SET_NULL_PTR(value) ((value & 0x1) << 31)
  31. #define ORB_SET_NOTIFY(value) ((value & 0x1) << 31)
  32. #define ORB_SET_RQ_FMT(value) ((value & 0x3) << 29) /* unused ? */
  33. #define ORB_SET_NODE_ID(value) ((value & 0xffff) << 16)
  34. #define ORB_SET_DATA_SIZE(value) (value & 0xffff)
  35. #define ORB_SET_PAGE_SIZE(value) ((value & 0x7) << 16)
  36. #define ORB_SET_PAGE_TABLE_PRESENT(value) ((value & 0x1) << 19)
  37. #define ORB_SET_MAX_PAYLOAD(value) ((value & 0xf) << 20)
  38. #define ORB_SET_SPEED(value) ((value & 0x7) << 24)
  39. #define ORB_SET_DIRECTION(value) ((value & 0x1) << 27)
  40. struct sbp2_command_orb {
  41. volatile u32 next_ORB_hi;
  42. volatile u32 next_ORB_lo;
  43. u32 data_descriptor_hi;
  44. u32 data_descriptor_lo;
  45. u32 misc;
  46. u8 cdb[12];
  47. };
  48. #define SBP2_LOGIN_REQUEST 0x0
  49. #define SBP2_QUERY_LOGINS_REQUEST 0x1
  50. #define SBP2_RECONNECT_REQUEST 0x3
  51. #define SBP2_SET_PASSWORD_REQUEST 0x4
  52. #define SBP2_LOGOUT_REQUEST 0x7
  53. #define SBP2_ABORT_TASK_REQUEST 0xb
  54. #define SBP2_ABORT_TASK_SET 0xc
  55. #define SBP2_LOGICAL_UNIT_RESET 0xe
  56. #define SBP2_TARGET_RESET_REQUEST 0xf
  57. #define ORB_SET_LUN(value) (value & 0xffff)
  58. #define ORB_SET_FUNCTION(value) ((value & 0xf) << 16)
  59. #define ORB_SET_RECONNECT(value) ((value & 0xf) << 20)
  60. #define ORB_SET_EXCLUSIVE(value) ((value & 0x1) << 28)
  61. #define ORB_SET_LOGIN_RESP_LENGTH(value) (value & 0xffff)
  62. #define ORB_SET_PASSWD_LENGTH(value) ((value & 0xffff) << 16)
  63. struct sbp2_login_orb {
  64. u32 password_hi;
  65. u32 password_lo;
  66. u32 login_response_hi;
  67. u32 login_response_lo;
  68. u32 lun_misc;
  69. u32 passwd_resp_lengths;
  70. u32 status_FIFO_hi;
  71. u32 status_FIFO_lo;
  72. };
  73. #define RESPONSE_GET_LOGIN_ID(value) (value & 0xffff)
  74. #define RESPONSE_GET_LENGTH(value) ((value >> 16) & 0xffff)
  75. #define RESPONSE_GET_RECONNECT_HOLD(value) (value & 0xffff)
  76. struct sbp2_login_response {
  77. u32 length_login_ID;
  78. u32 command_block_agent_hi;
  79. u32 command_block_agent_lo;
  80. u32 reconnect_hold;
  81. };
  82. #define ORB_SET_LOGIN_ID(value) (value & 0xffff)
  83. #define ORB_SET_QUERY_LOGINS_RESP_LENGTH(value) (value & 0xffff)
  84. struct sbp2_query_logins_orb {
  85. u32 reserved1;
  86. u32 reserved2;
  87. u32 query_response_hi;
  88. u32 query_response_lo;
  89. u32 lun_misc;
  90. u32 reserved_resp_length;
  91. u32 status_FIFO_hi;
  92. u32 status_FIFO_lo;
  93. };
  94. #define RESPONSE_GET_MAX_LOGINS(value) (value & 0xffff)
  95. #define RESPONSE_GET_ACTIVE_LOGINS(value) ((RESPONSE_GET_LENGTH(value) - 4) / 12)
  96. struct sbp2_query_logins_response {
  97. u32 length_max_logins;
  98. u32 misc_IDs;
  99. u32 initiator_misc_hi;
  100. u32 initiator_misc_lo;
  101. };
  102. struct sbp2_reconnect_orb {
  103. u32 reserved1;
  104. u32 reserved2;
  105. u32 reserved3;
  106. u32 reserved4;
  107. u32 login_ID_misc;
  108. u32 reserved5;
  109. u32 status_FIFO_hi;
  110. u32 status_FIFO_lo;
  111. };
  112. struct sbp2_logout_orb {
  113. u32 reserved1;
  114. u32 reserved2;
  115. u32 reserved3;
  116. u32 reserved4;
  117. u32 login_ID_misc;
  118. u32 reserved5;
  119. u32 status_FIFO_hi;
  120. u32 status_FIFO_lo;
  121. };
  122. #define PAGE_TABLE_SET_SEGMENT_BASE_HI(value) (value & 0xffff)
  123. #define PAGE_TABLE_SET_SEGMENT_LENGTH(value) ((value & 0xffff) << 16)
  124. struct sbp2_unrestricted_page_table {
  125. u32 length_segment_base_hi;
  126. u32 segment_base_lo;
  127. };
  128. #define RESP_STATUS_REQUEST_COMPLETE 0x0
  129. #define RESP_STATUS_TRANSPORT_FAILURE 0x1
  130. #define RESP_STATUS_ILLEGAL_REQUEST 0x2
  131. #define RESP_STATUS_VENDOR_DEPENDENT 0x3
  132. #define SBP2_STATUS_NO_ADDITIONAL_INFO 0x0
  133. #define SBP2_STATUS_REQ_TYPE_NOT_SUPPORTED 0x1
  134. #define SBP2_STATUS_SPEED_NOT_SUPPORTED 0x2
  135. #define SBP2_STATUS_PAGE_SIZE_NOT_SUPPORTED 0x3
  136. #define SBP2_STATUS_ACCESS_DENIED 0x4
  137. #define SBP2_STATUS_LU_NOT_SUPPORTED 0x5
  138. #define SBP2_STATUS_MAX_PAYLOAD_TOO_SMALL 0x6
  139. #define SBP2_STATUS_RESOURCES_UNAVAILABLE 0x8
  140. #define SBP2_STATUS_FUNCTION_REJECTED 0x9
  141. #define SBP2_STATUS_LOGIN_ID_NOT_RECOGNIZED 0xa
  142. #define SBP2_STATUS_DUMMY_ORB_COMPLETED 0xb
  143. #define SBP2_STATUS_REQUEST_ABORTED 0xc
  144. #define SBP2_STATUS_UNSPECIFIED_ERROR 0xff
  145. #define SFMT_CURRENT_ERROR 0x0
  146. #define SFMT_DEFERRED_ERROR 0x1
  147. #define SFMT_VENDOR_DEPENDENT_STATUS 0x3
  148. #define SBP2_SCSI_STATUS_GOOD 0x0
  149. #define SBP2_SCSI_STATUS_CHECK_CONDITION 0x2
  150. #define SBP2_SCSI_STATUS_CONDITION_MET 0x4
  151. #define SBP2_SCSI_STATUS_BUSY 0x8
  152. #define SBP2_SCSI_STATUS_RESERVATION_CONFLICT 0x18
  153. #define SBP2_SCSI_STATUS_COMMAND_TERMINATED 0x22
  154. #define SBP2_SCSI_STATUS_SELECTION_TIMEOUT 0xff
  155. #define STATUS_GET_ORB_OFFSET_HI(value) (value & 0xffff)
  156. #define STATUS_GET_SBP_STATUS(value) ((value >> 16) & 0xff)
  157. #define STATUS_GET_LENGTH(value) ((value >> 24) & 0x7)
  158. #define STATUS_GET_DEAD_BIT(value) ((value >> 27) & 0x1)
  159. #define STATUS_GET_RESP(value) ((value >> 28) & 0x3)
  160. #define STATUS_GET_SRC(value) ((value >> 30) & 0x3)
  161. struct sbp2_status_block {
  162. u32 ORB_offset_hi_misc;
  163. u32 ORB_offset_lo;
  164. u8 command_set_dependent[24];
  165. };
  166. /*
  167. * Miscellaneous SBP2 related config rom defines
  168. */
  169. /* The status fifo address definition below is used as a base for each
  170. * node, which a chunk seperately assigned to each unit directory in the
  171. * node. For example, 0xfffe00000000ULL is used for the first sbp2 device
  172. * detected on node 0, 0xfffe00000020ULL for the next sbp2 device on node
  173. * 0, and so on.
  174. *
  175. * Note: We could use a single status fifo address for all sbp2 devices,
  176. * and figure out which sbp2 device the status belongs to by looking at
  177. * the source node id of the status write... but, using separate addresses
  178. * for each sbp2 unit directory allows for better code and the ability to
  179. * support multiple luns within a single 1394 node.
  180. *
  181. * Also note that we choose the address range below as it is a region
  182. * specified for write posting, where the ohci controller will
  183. * automatically send an ack_complete when the status is written by the
  184. * sbp2 device... saving a split transaction. =)
  185. */
  186. #define SBP2_STATUS_FIFO_ADDRESS 0xfffe00000000ULL
  187. #define SBP2_STATUS_FIFO_ADDRESS_HI 0xfffe
  188. #define SBP2_STATUS_FIFO_ADDRESS_LO 0x0
  189. #define SBP2_STATUS_FIFO_ENTRY_TO_OFFSET(entry) ((entry) << 5)
  190. #define SBP2_STATUS_FIFO_OFFSET_TO_ENTRY(offset) ((offset) >> 5)
  191. #define SBP2_UNIT_DIRECTORY_OFFSET_KEY 0xd1
  192. #define SBP2_CSR_OFFSET_KEY 0x54
  193. #define SBP2_UNIT_SPEC_ID_KEY 0x12
  194. #define SBP2_UNIT_SW_VERSION_KEY 0x13
  195. #define SBP2_COMMAND_SET_SPEC_ID_KEY 0x38
  196. #define SBP2_COMMAND_SET_KEY 0x39
  197. #define SBP2_UNIT_CHARACTERISTICS_KEY 0x3a
  198. #define SBP2_DEVICE_TYPE_AND_LUN_KEY 0x14
  199. #define SBP2_FIRMWARE_REVISION_KEY 0x3c
  200. #define SBP2_DEVICE_TYPE(q) (((q) >> 16) & 0x1f)
  201. #define SBP2_DEVICE_LUN(q) ((q) & 0xffff)
  202. #define SBP2_AGENT_STATE_OFFSET 0x00ULL
  203. #define SBP2_AGENT_RESET_OFFSET 0x04ULL
  204. #define SBP2_ORB_POINTER_OFFSET 0x08ULL
  205. #define SBP2_DOORBELL_OFFSET 0x10ULL
  206. #define SBP2_UNSOLICITED_STATUS_ENABLE_OFFSET 0x14ULL
  207. #define SBP2_UNSOLICITED_STATUS_VALUE 0xf
  208. #define SBP2_BUSY_TIMEOUT_ADDRESS 0xfffff0000210ULL
  209. #define SBP2_BUSY_TIMEOUT_VALUE 0xf
  210. #define SBP2_AGENT_RESET_DATA 0xf
  211. /*
  212. * Unit spec id and sw version entry for SBP-2 devices
  213. */
  214. #define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e
  215. #define SBP2_SW_VERSION_ENTRY 0x00010483
  216. /*
  217. * Other misc defines
  218. */
  219. #define SBP2_128KB_BROKEN_FIRMWARE 0xa0b800
  220. #define SBP2_DEVICE_TYPE_LUN_UNINITIALIZED 0xffffffff
  221. /*
  222. * SCSI specific stuff
  223. */
  224. #define SBP2_MAX_SG_ELEMENT_LENGTH 0xf000
  225. #define SBP2_MAX_UDS_PER_NODE 16 /* Maximum scsi devices per node */
  226. #define SBP2_MAX_SECTORS 255 /* Max sectors supported */
  227. #ifndef TYPE_SDAD
  228. #define TYPE_SDAD 0x0e /* simplified direct access device */
  229. #endif
  230. /*
  231. * SCSI direction table...
  232. * (now used as a back-up in case the direction passed down from above is "unknown")
  233. *
  234. * DIN = IN data direction
  235. * DOU = OUT data direction
  236. * DNO = No data transfer
  237. * DUN = Unknown data direction
  238. *
  239. * Opcode 0xec (Teac specific "opc execute") possibly should be DNO,
  240. * but we'll change it when somebody reports a problem with this.
  241. */
  242. #define DIN ORB_DIRECTION_READ_FROM_MEDIA
  243. #define DOU ORB_DIRECTION_WRITE_TO_MEDIA
  244. #define DNO ORB_DIRECTION_NO_DATA_TRANSFER
  245. #define DUN DIN
  246. static unchar sbp2scsi_direction_table[0x100] = {
  247. DNO,DNO,DIN,DIN,DOU,DIN,DIN,DOU,DIN,DUN,DOU,DOU,DUN,DUN,DUN,DIN,
  248. DNO,DIN,DIN,DOU,DIN,DOU,DNO,DNO,DOU,DNO,DIN,DNO,DIN,DOU,DNO,DUN,
  249. DIN,DUN,DIN,DIN,DOU,DIN,DUN,DUN,DIN,DIN,DOU,DNO,DUN,DIN,DOU,DOU,
  250. DOU,DOU,DOU,DNO,DIN,DNO,DNO,DIN,DOU,DOU,DOU,DOU,DIN,DOU,DIN,DOU,
  251. DOU,DOU,DIN,DIN,DIN,DNO,DIN,DNO,DNO,DNO,DUN,DNO,DOU,DIN,DNO,DUN,
  252. DUN,DIN,DIN,DNO,DNO,DOU,DUN,DUN,DNO,DIN,DIN,DNO,DIN,DOU,DUN,DUN,
  253. DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
  254. DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
  255. DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
  256. DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
  257. DUN,DNO,DOU,DOU,DIN,DNO,DNO,DNO,DIN,DNO,DOU,DUN,DNO,DIN,DOU,DOU,
  258. DOU,DOU,DOU,DNO,DUN,DIN,DOU,DIN,DIN,DIN,DNO,DNO,DNO,DIN,DIN,DUN,
  259. DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
  260. DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,
  261. DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DOU,DUN,DUN,DUN,DUN,DUN,
  262. DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN,DUN
  263. };
  264. /* This should be safe */
  265. #define SBP2_MAX_CMDS 8
  266. /* This is the two dma types we use for cmd_dma below */
  267. enum cmd_dma_types {
  268. CMD_DMA_NONE,
  269. CMD_DMA_PAGE,
  270. CMD_DMA_SINGLE
  271. };
  272. /*
  273. * Encapsulates all the info necessary for an outstanding command.
  274. */
  275. struct sbp2_command_info {
  276. struct list_head list;
  277. struct sbp2_command_orb command_orb ____cacheline_aligned;
  278. dma_addr_t command_orb_dma ____cacheline_aligned;
  279. struct scsi_cmnd *Current_SCpnt;
  280. void (*Current_done)(struct scsi_cmnd *);
  281. /* Also need s/g structure for each sbp2 command */
  282. struct sbp2_unrestricted_page_table scatter_gather_element[SG_ALL] ____cacheline_aligned;
  283. dma_addr_t sge_dma ____cacheline_aligned;
  284. void *sge_buffer;
  285. dma_addr_t cmd_dma;
  286. enum cmd_dma_types dma_type;
  287. unsigned long dma_size;
  288. int dma_dir;
  289. };
  290. /* A list of flags for detected oddities and brokeness. */
  291. #define SBP2_BREAKAGE_128K_MAX_TRANSFER 0x1
  292. #define SBP2_BREAKAGE_INQUIRY_HACK 0x2
  293. struct sbp2scsi_host_info;
  294. /*
  295. * Information needed on a per scsi id basis (one for each sbp2 device)
  296. */
  297. struct scsi_id_instance_data {
  298. /*
  299. * Various sbp2 specific structures
  300. */
  301. struct sbp2_command_orb *last_orb;
  302. dma_addr_t last_orb_dma;
  303. struct sbp2_login_orb *login_orb;
  304. dma_addr_t login_orb_dma;
  305. struct sbp2_login_response *login_response;
  306. dma_addr_t login_response_dma;
  307. struct sbp2_query_logins_orb *query_logins_orb;
  308. dma_addr_t query_logins_orb_dma;
  309. struct sbp2_query_logins_response *query_logins_response;
  310. dma_addr_t query_logins_response_dma;
  311. struct sbp2_reconnect_orb *reconnect_orb;
  312. dma_addr_t reconnect_orb_dma;
  313. struct sbp2_logout_orb *logout_orb;
  314. dma_addr_t logout_orb_dma;
  315. struct sbp2_status_block status_block;
  316. /*
  317. * Stuff we need to know about the sbp2 device itself
  318. */
  319. u64 sbp2_management_agent_addr;
  320. u64 sbp2_command_block_agent_addr;
  321. u32 speed_code;
  322. u32 max_payload_size;
  323. /*
  324. * Values pulled from the device's unit directory
  325. */
  326. u32 sbp2_command_set_spec_id;
  327. u32 sbp2_command_set;
  328. u32 sbp2_unit_characteristics;
  329. u32 sbp2_device_type_and_lun;
  330. u32 sbp2_firmware_revision;
  331. /*
  332. * Variable used for logins, reconnects, logouts, query logins
  333. */
  334. atomic_t sbp2_login_complete;
  335. /*
  336. * Pool of command orbs, so we can have more than overlapped command per id
  337. */
  338. spinlock_t sbp2_command_orb_lock;
  339. struct list_head sbp2_command_orb_inuse;
  340. struct list_head sbp2_command_orb_completed;
  341. struct list_head scsi_list;
  342. /* Node entry, as retrieved from NodeMgr entries */
  343. struct node_entry *ne;
  344. struct unit_directory *ud;
  345. /* A backlink to our host_info */
  346. struct sbp2scsi_host_info *hi;
  347. /* SCSI related pointers */
  348. struct scsi_device *sdev;
  349. struct Scsi_Host *scsi_host;
  350. /* Device specific workarounds/brokeness */
  351. u32 workarounds;
  352. };
  353. /* Sbp2 host data structure (one per IEEE1394 host) */
  354. struct sbp2scsi_host_info {
  355. struct hpsb_host *host; /* IEEE1394 host */
  356. struct list_head scsi_ids; /* List of scsi ids on this host */
  357. };
  358. /*
  359. * Function prototypes
  360. */
  361. /*
  362. * Various utility prototypes
  363. */
  364. static int sbp2util_create_command_orb_pool(struct scsi_id_instance_data *scsi_id);
  365. static void sbp2util_remove_command_orb_pool(struct scsi_id_instance_data *scsi_id);
  366. static struct sbp2_command_info *sbp2util_find_command_for_orb(struct scsi_id_instance_data *scsi_id, dma_addr_t orb);
  367. static struct sbp2_command_info *sbp2util_find_command_for_SCpnt(struct scsi_id_instance_data *scsi_id, void *SCpnt);
  368. static struct sbp2_command_info *sbp2util_allocate_command_orb(struct scsi_id_instance_data *scsi_id,
  369. struct scsi_cmnd *Current_SCpnt,
  370. void (*Current_done)(struct scsi_cmnd *));
  371. static void sbp2util_mark_command_completed(struct scsi_id_instance_data *scsi_id,
  372. struct sbp2_command_info *command);
  373. static int sbp2_start_device(struct scsi_id_instance_data *scsi_id);
  374. static void sbp2_remove_device(struct scsi_id_instance_data *scsi_id);
  375. #ifdef CONFIG_IEEE1394_SBP2_PHYS_DMA
  376. static int sbp2_handle_physdma_write(struct hpsb_host *host, int nodeid, int destid, quadlet_t *data,
  377. u64 addr, size_t length, u16 flags);
  378. static int sbp2_handle_physdma_read(struct hpsb_host *host, int nodeid, quadlet_t *data,
  379. u64 addr, size_t length, u16 flags);
  380. #endif
  381. /*
  382. * SBP-2 protocol related prototypes
  383. */
  384. static int sbp2_query_logins(struct scsi_id_instance_data *scsi_id);
  385. static int sbp2_login_device(struct scsi_id_instance_data *scsi_id);
  386. static int sbp2_reconnect_device(struct scsi_id_instance_data *scsi_id);
  387. static int sbp2_logout_device(struct scsi_id_instance_data *scsi_id);
  388. static int sbp2_handle_status_write(struct hpsb_host *host, int nodeid, int destid,
  389. quadlet_t *data, u64 addr, size_t length, u16 flags);
  390. static int sbp2_agent_reset(struct scsi_id_instance_data *scsi_id, int wait);
  391. static int sbp2_create_command_orb(struct scsi_id_instance_data *scsi_id,
  392. struct sbp2_command_info *command,
  393. unchar *scsi_cmd,
  394. unsigned int scsi_use_sg,
  395. unsigned int scsi_request_bufflen,
  396. void *scsi_request_buffer,
  397. enum dma_data_direction dma_dir);
  398. static int sbp2_link_orb_command(struct scsi_id_instance_data *scsi_id,
  399. struct sbp2_command_info *command);
  400. static int sbp2_send_command(struct scsi_id_instance_data *scsi_id,
  401. struct scsi_cmnd *SCpnt,
  402. void (*done)(struct scsi_cmnd *));
  403. static unsigned int sbp2_status_to_sense_data(unchar *sbp2_status, unchar *sense_data);
  404. static void sbp2_check_sbp2_command(struct scsi_id_instance_data *scsi_id, unchar *cmd);
  405. static void sbp2_check_sbp2_response(struct scsi_id_instance_data *scsi_id,
  406. struct scsi_cmnd *SCpnt);
  407. static void sbp2_parse_unit_directory(struct scsi_id_instance_data *scsi_id,
  408. struct unit_directory *ud);
  409. static int sbp2_set_busy_timeout(struct scsi_id_instance_data *scsi_id);
  410. static int sbp2_max_speed_and_size(struct scsi_id_instance_data *scsi_id);
  411. #endif /* SBP2_H */