1 // SPDX-License-Identifier: GPL-2.0+ 2 /* 3 * storage_common.c -- Common definitions for mass storage functionality 4 * 5 * Copyright (C) 2003-2008 Alan Stern 6 * Copyeight (C) 2009 Samsung Electronics 7 * Author: Michal Nazarewicz (m.nazarewicz@samsung.com) 8 * 9 * Ported to u-boot: 10 * Andrzej Pietrasiewicz <andrzej.p@samsung.com> 11 * 12 * Code refactoring & cleanup: 13 * Łukasz Majewski <l.majewski@samsung.com> 14 */ 15 16 17 /* 18 * This file requires the following identifiers used in USB strings to 19 * be defined (each of type pointer to char): 20 * - fsg_string_manufacturer -- name of the manufacturer 21 * - fsg_string_product -- name of the product 22 * - fsg_string_serial -- product's serial 23 * - fsg_string_config -- name of the configuration 24 * - fsg_string_interface -- name of the interface 25 * The first four are only needed when FSG_DESCRIPTORS_DEVICE_STRINGS 26 * macro is defined prior to including this file. 27 */ 28 29 /* 30 * When FSG_NO_INTR_EP is defined fsg_fs_intr_in_desc and 31 * fsg_hs_intr_in_desc objects as well as 32 * FSG_FS_FUNCTION_PRE_EP_ENTRIES and FSG_HS_FUNCTION_PRE_EP_ENTRIES 33 * macros are not defined. 34 * 35 * When FSG_NO_DEVICE_STRINGS is defined FSG_STRING_MANUFACTURER, 36 * FSG_STRING_PRODUCT, FSG_STRING_SERIAL and FSG_STRING_CONFIG are not 37 * defined (as well as corresponding entries in string tables are 38 * missing) and FSG_STRING_INTERFACE has value of zero. 39 * 40 * When FSG_NO_OTG is defined fsg_otg_desc won't be defined. 41 */ 42 43 /* 44 * When FSG_BUFFHD_STATIC_BUFFER is defined when this file is included 45 * the fsg_buffhd structure's buf field will be an array of FSG_BUFLEN 46 * characters rather then a pointer to void. 47 */ 48 49 50 /* #include <asm/unaligned.h> */ 51 52 53 /* 54 * Thanks to NetChip Technologies for donating this product ID. 55 * 56 * DO NOT REUSE THESE IDs with any other driver!! Ever!! 57 * Instead: allocate your own, using normal USB-IF procedures. 58 */ 59 #define FSG_VENDOR_ID 0x0525 /* NetChip */ 60 #define FSG_PRODUCT_ID 0xa4a5 /* Linux-USB File-backed Storage Gadget */ 61 62 /*-------------------------------------------------------------------------*/ 63 64 #ifndef DEBUG 65 #undef VERBOSE_DEBUG 66 #undef DUMP_MSGS 67 #endif /* !DEBUG */ 68 69 #ifdef VERBOSE_DEBUG 70 #define VLDBG LDBG 71 #else 72 #define VLDBG(lun, fmt, args...) do { } while (0) 73 #endif /* VERBOSE_DEBUG */ 74 75 /* 76 #define LDBG(lun, fmt, args...) dev_dbg (&(lun)->dev, fmt, ## args) 77 #define LERROR(lun, fmt, args...) dev_err (&(lun)->dev, fmt, ## args) 78 #define LWARN(lun, fmt, args...) dev_warn(&(lun)->dev, fmt, ## args) 79 #define LINFO(lun, fmt, args...) dev_info(&(lun)->dev, fmt, ## args) 80 */ 81 82 #define LDBG(lun, fmt, args...) do { } while (0) 83 #define LERROR(lun, fmt, args...) do { } while (0) 84 #define LWARN(lun, fmt, args...) do { } while (0) 85 #define LINFO(lun, fmt, args...) do { } while (0) 86 87 /* 88 * Keep those macros in sync with those in 89 * include/linux/usb/composite.h or else GCC will complain. If they 90 * are identical (the same names of arguments, white spaces in the 91 * same places) GCC will allow redefinition otherwise (even if some 92 * white space is removed or added) warning will be issued. 93 * 94 * Those macros are needed here because File Storage Gadget does not 95 * include the composite.h header. For composite gadgets those macros 96 * are redundant since composite.h is included any way. 97 * 98 * One could check whether those macros are already defined (which 99 * would indicate composite.h had been included) or not (which would 100 * indicate we were in FSG) but this is not done because a warning is 101 * desired if definitions here differ from the ones in composite.h. 102 * 103 * We want the definitions to match and be the same in File Storage 104 * Gadget as well as Mass Storage Function (and so composite gadgets 105 * using MSF). If someone changes them in composite.h it will produce 106 * a warning in this file when building MSF. 107 */ 108 109 #define DBG(d, fmt, args...) debug(fmt , ## args) 110 #define VDBG(d, fmt, args...) debug(fmt , ## args) 111 /* #define ERROR(d, fmt, args...) printf(fmt , ## args) */ 112 /* #define WARNING(d, fmt, args...) printf(fmt , ## args) */ 113 /* #define INFO(d, fmt, args...) printf(fmt , ## args) */ 114 115 /* #define DBG(d, fmt, args...) do { } while (0) */ 116 /* #define VDBG(d, fmt, args...) do { } while (0) */ 117 #define ERROR(d, fmt, args...) do { } while (0) 118 #define WARNING(d, fmt, args...) do { } while (0) 119 #define INFO(d, fmt, args...) do { } while (0) 120 121 #ifdef DUMP_MSGS 122 123 /* dump_msg(fsg, const char * label, const u8 * buf, unsigned length); */ 124 # define dump_msg(fsg, label, buf, length) do { \ 125 if (length < 512) { \ 126 DBG(fsg, "%s, length %u:\n", label, length); \ 127 print_hex_dump("", DUMP_PREFIX_OFFSET, \ 128 16, 1, buf, length, 0); \ 129 } \ 130 } while (0) 131 132 # define dump_cdb(fsg) do { } while (0) 133 134 #else 135 136 # define dump_msg(fsg, /* const char * */ label, \ 137 /* const u8 * */ buf, /* unsigned */ length) do { } while (0) 138 139 # ifdef VERBOSE_DEBUG 140 141 # define dump_cdb(fsg) \ 142 print_hex_dump("SCSI CDB: ", DUMP_PREFIX_NONE, \ 143 16, 1, (fsg)->cmnd, (fsg)->cmnd_size, 0) \ 144 145 # else 146 147 # define dump_cdb(fsg) do { } while (0) 148 149 # endif /* VERBOSE_DEBUG */ 150 151 #endif /* DUMP_MSGS */ 152 153 /*-------------------------------------------------------------------------*/ 154 155 /* SCSI device types */ 156 #define TYPE_DISK 0x00 157 #define TYPE_CDROM 0x05 158 159 /* USB protocol value = the transport method */ 160 #define USB_PR_CBI 0x00 /* Control/Bulk/Interrupt */ 161 #define USB_PR_CB 0x01 /* Control/Bulk w/o interrupt */ 162 #define USB_PR_BULK 0x50 /* Bulk-only */ 163 164 /* USB subclass value = the protocol encapsulation */ 165 #define USB_SC_RBC 0x01 /* Reduced Block Commands (flash) */ 166 #define USB_SC_8020 0x02 /* SFF-8020i, MMC-2, ATAPI (CD-ROM) */ 167 #define USB_SC_QIC 0x03 /* QIC-157 (tape) */ 168 #define USB_SC_UFI 0x04 /* UFI (floppy) */ 169 #define USB_SC_8070 0x05 /* SFF-8070i (removable) */ 170 #define USB_SC_SCSI 0x06 /* Transparent SCSI */ 171 172 /* Bulk-only data structures */ 173 174 /* Command Block Wrapper */ 175 struct fsg_bulk_cb_wrap { 176 __le32 Signature; /* Contains 'USBC' */ 177 u32 Tag; /* Unique per command id */ 178 __le32 DataTransferLength; /* Size of the data */ 179 u8 Flags; /* Direction in bit 7 */ 180 u8 Lun; /* LUN (normally 0) */ 181 u8 Length; /* Of the CDB, <= MAX_COMMAND_SIZE */ 182 u8 CDB[16]; /* Command Data Block */ 183 }; 184 185 #define USB_BULK_CB_WRAP_LEN 31 186 #define USB_BULK_CB_SIG 0x43425355 /* Spells out USBC */ 187 #define USB_BULK_IN_FLAG 0x80 188 189 /* Command Status Wrapper */ 190 struct bulk_cs_wrap { 191 __le32 Signature; /* Should = 'USBS' */ 192 u32 Tag; /* Same as original command */ 193 __le32 Residue; /* Amount not transferred */ 194 u8 Status; /* See below */ 195 }; 196 197 #define USB_BULK_CS_WRAP_LEN 13 198 #define USB_BULK_CS_SIG 0x53425355 /* Spells out 'USBS' */ 199 #define USB_STATUS_PASS 0 200 #define USB_STATUS_FAIL 1 201 #define USB_STATUS_PHASE_ERROR 2 202 203 /* Bulk-only class specific requests */ 204 #define USB_BULK_RESET_REQUEST 0xff 205 #define USB_BULK_GET_MAX_LUN_REQUEST 0xfe 206 207 /* CBI Interrupt data structure */ 208 struct interrupt_data { 209 u8 bType; 210 u8 bValue; 211 }; 212 213 #define CBI_INTERRUPT_DATA_LEN 2 214 215 /* CBI Accept Device-Specific Command request */ 216 #define USB_CBI_ADSC_REQUEST 0x00 217 218 /* Length of a SCSI Command Data Block */ 219 #define MAX_COMMAND_SIZE 16 220 221 /* SCSI commands that we recognize */ 222 #define SC_FORMAT_UNIT 0x04 223 #define SC_INQUIRY 0x12 224 #define SC_MODE_SELECT_6 0x15 225 #define SC_MODE_SELECT_10 0x55 226 #define SC_MODE_SENSE_6 0x1a 227 #define SC_MODE_SENSE_10 0x5a 228 #define SC_PREVENT_ALLOW_MEDIUM_REMOVAL 0x1e 229 #define SC_READ_6 0x08 230 #define SC_READ_10 0x28 231 #define SC_READ_12 0xa8 232 #define SC_READ_CAPACITY 0x25 233 #define SC_READ_FORMAT_CAPACITIES 0x23 234 #define SC_READ_HEADER 0x44 235 #define SC_READ_TOC 0x43 236 #define SC_RELEASE 0x17 237 #define SC_REQUEST_SENSE 0x03 238 #define SC_RESERVE 0x16 239 #define SC_SEND_DIAGNOSTIC 0x1d 240 #define SC_START_STOP_UNIT 0x1b 241 #define SC_SYNCHRONIZE_CACHE 0x35 242 #define SC_TEST_UNIT_READY 0x00 243 #define SC_VERIFY 0x2f 244 #define SC_WRITE_6 0x0a 245 #define SC_WRITE_10 0x2a 246 #define SC_WRITE_12 0xaa 247 248 /* SCSI Sense Key/Additional Sense Code/ASC Qualifier values */ 249 #define SS_NO_SENSE 0 250 #define SS_COMMUNICATION_FAILURE 0x040800 251 #define SS_INVALID_COMMAND 0x052000 252 #define SS_INVALID_FIELD_IN_CDB 0x052400 253 #define SS_LOGICAL_BLOCK_ADDRESS_OUT_OF_RANGE 0x052100 254 #define SS_LOGICAL_UNIT_NOT_SUPPORTED 0x052500 255 #define SS_MEDIUM_NOT_PRESENT 0x023a00 256 #define SS_MEDIUM_REMOVAL_PREVENTED 0x055302 257 #define SS_NOT_READY_TO_READY_TRANSITION 0x062800 258 #define SS_RESET_OCCURRED 0x062900 259 #define SS_SAVING_PARAMETERS_NOT_SUPPORTED 0x053900 260 #define SS_UNRECOVERED_READ_ERROR 0x031100 261 #define SS_WRITE_ERROR 0x030c02 262 #define SS_WRITE_PROTECTED 0x072700 263 264 #define SK(x) ((u8) ((x) >> 16)) /* Sense Key byte, etc. */ 265 #define ASC(x) ((u8) ((x) >> 8)) 266 #define ASCQ(x) ((u8) (x)) 267 268 struct device_attribute { int i; }; 269 #define ETOOSMALL 525 270 271 #include <usb_mass_storage.h> 272 273 /*-------------------------------------------------------------------------*/ 274 275 struct fsg_lun { 276 loff_t file_length; 277 loff_t num_sectors; 278 279 unsigned int initially_ro:1; 280 unsigned int ro:1; 281 unsigned int removable:1; 282 unsigned int cdrom:1; 283 unsigned int prevent_medium_removal:1; 284 unsigned int registered:1; 285 unsigned int info_valid:1; 286 unsigned int nofua:1; 287 288 u32 sense_data; 289 u32 sense_data_info; 290 u32 unit_attention_data; 291 292 struct device dev; 293 }; 294 295 #define fsg_lun_is_open(curlun) ((curlun)->filp != NULL) 296 #if 0 297 static struct fsg_lun *fsg_lun_from_dev(struct device *dev) 298 { 299 return container_of(dev, struct fsg_lun, dev); 300 } 301 #endif 302 303 /* Big enough to hold our biggest descriptor */ 304 #define EP0_BUFSIZE 256 305 #define DELAYED_STATUS (EP0_BUFSIZE + 999) /* An impossibly large value */ 306 307 /* Number of buffers we will use. 2 is enough for double-buffering */ 308 #define FSG_NUM_BUFFERS 2 309 310 /* Default size of buffer length. */ 311 #define FSG_BUFLEN ((u32)131072) 312 313 /* Maximal number of LUNs supported in mass storage function */ 314 #define FSG_MAX_LUNS 8 315 316 enum fsg_buffer_state { 317 BUF_STATE_EMPTY = 0, 318 BUF_STATE_FULL, 319 BUF_STATE_BUSY 320 }; 321 322 struct fsg_buffhd { 323 #ifdef FSG_BUFFHD_STATIC_BUFFER 324 char buf[FSG_BUFLEN]; 325 #else 326 void *buf; 327 #endif 328 enum fsg_buffer_state state; 329 struct fsg_buffhd *next; 330 331 /* 332 * The NetChip 2280 is faster, and handles some protocol faults 333 * better, if we don't submit any short bulk-out read requests. 334 * So we will record the intended request length here. 335 */ 336 unsigned int bulk_out_intended_length; 337 338 struct usb_request *inreq; 339 int inreq_busy; 340 struct usb_request *outreq; 341 int outreq_busy; 342 }; 343 344 enum fsg_state { 345 /* This one isn't used anywhere */ 346 FSG_STATE_COMMAND_PHASE = -10, 347 FSG_STATE_DATA_PHASE, 348 FSG_STATE_STATUS_PHASE, 349 350 FSG_STATE_IDLE = 0, 351 FSG_STATE_ABORT_BULK_OUT, 352 FSG_STATE_RESET, 353 FSG_STATE_INTERFACE_CHANGE, 354 FSG_STATE_CONFIG_CHANGE, 355 FSG_STATE_DISCONNECT, 356 FSG_STATE_EXIT, 357 FSG_STATE_TERMINATED 358 }; 359 360 enum data_direction { 361 DATA_DIR_UNKNOWN = 0, 362 DATA_DIR_FROM_HOST, 363 DATA_DIR_TO_HOST, 364 DATA_DIR_NONE 365 }; 366 367 /*-------------------------------------------------------------------------*/ 368 369 static inline u32 get_unaligned_be24(u8 *buf) 370 { 371 return 0xffffff & (u32) get_unaligned_be32(buf - 1); 372 } 373 374 /*-------------------------------------------------------------------------*/ 375 376 enum { 377 #ifndef FSG_NO_DEVICE_STRINGS 378 FSG_STRING_MANUFACTURER = 1, 379 FSG_STRING_PRODUCT, 380 FSG_STRING_SERIAL, 381 FSG_STRING_CONFIG, 382 #endif 383 FSG_STRING_INTERFACE 384 }; 385 386 #ifndef FSG_NO_OTG 387 static struct usb_otg_descriptor 388 fsg_otg_desc = { 389 .bLength = sizeof fsg_otg_desc, 390 .bDescriptorType = USB_DT_OTG, 391 392 .bmAttributes = USB_OTG_SRP, 393 }; 394 #endif 395 396 /* There is only one interface. */ 397 398 static struct usb_interface_descriptor 399 fsg_intf_desc = { 400 .bLength = sizeof fsg_intf_desc, 401 .bDescriptorType = USB_DT_INTERFACE, 402 403 .bNumEndpoints = 2, /* Adjusted during fsg_bind() */ 404 .bInterfaceClass = USB_CLASS_MASS_STORAGE, 405 .bInterfaceSubClass = USB_SC_SCSI, /* Adjusted during fsg_bind() */ 406 .bInterfaceProtocol = USB_PR_BULK, /* Adjusted during fsg_bind() */ 407 .iInterface = FSG_STRING_INTERFACE, 408 }; 409 410 /* 411 * Three full-speed endpoint descriptors: bulk-in, bulk-out, and 412 * interrupt-in. 413 */ 414 415 static struct usb_endpoint_descriptor 416 fsg_fs_bulk_in_desc = { 417 .bLength = USB_DT_ENDPOINT_SIZE, 418 .bDescriptorType = USB_DT_ENDPOINT, 419 420 .bEndpointAddress = USB_DIR_IN, 421 .bmAttributes = USB_ENDPOINT_XFER_BULK, 422 /* wMaxPacketSize set by autoconfiguration */ 423 }; 424 425 static struct usb_endpoint_descriptor 426 fsg_fs_bulk_out_desc = { 427 .bLength = USB_DT_ENDPOINT_SIZE, 428 .bDescriptorType = USB_DT_ENDPOINT, 429 430 .bEndpointAddress = USB_DIR_OUT, 431 .bmAttributes = USB_ENDPOINT_XFER_BULK, 432 /* wMaxPacketSize set by autoconfiguration */ 433 }; 434 435 #ifndef FSG_NO_INTR_EP 436 437 static struct usb_endpoint_descriptor 438 fsg_fs_intr_in_desc = { 439 .bLength = USB_DT_ENDPOINT_SIZE, 440 .bDescriptorType = USB_DT_ENDPOINT, 441 442 .bEndpointAddress = USB_DIR_IN, 443 .bmAttributes = USB_ENDPOINT_XFER_INT, 444 .wMaxPacketSize = cpu_to_le16(2), 445 .bInterval = 32, /* frames -> 32 ms */ 446 }; 447 448 #ifndef FSG_NO_OTG 449 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 2 450 #else 451 # define FSG_FS_FUNCTION_PRE_EP_ENTRIES 1 452 #endif 453 454 #endif 455 456 static struct usb_descriptor_header *fsg_fs_function[] = { 457 #ifndef FSG_NO_OTG 458 (struct usb_descriptor_header *) &fsg_otg_desc, 459 #endif 460 (struct usb_descriptor_header *) &fsg_intf_desc, 461 (struct usb_descriptor_header *) &fsg_fs_bulk_in_desc, 462 (struct usb_descriptor_header *) &fsg_fs_bulk_out_desc, 463 #ifndef FSG_NO_INTR_EP 464 (struct usb_descriptor_header *) &fsg_fs_intr_in_desc, 465 #endif 466 NULL, 467 }; 468 469 /* 470 * USB 2.0 devices need to expose both high speed and full speed 471 * descriptors, unless they only run at full speed. 472 * 473 * That means alternate endpoint descriptors (bigger packets) 474 * and a "device qualifier" ... plus more construction options 475 * for the configuration descriptor. 476 */ 477 static struct usb_endpoint_descriptor 478 fsg_hs_bulk_in_desc = { 479 .bLength = USB_DT_ENDPOINT_SIZE, 480 .bDescriptorType = USB_DT_ENDPOINT, 481 482 /* bEndpointAddress copied from fs_bulk_in_desc during fsg_bind() */ 483 .bmAttributes = USB_ENDPOINT_XFER_BULK, 484 .wMaxPacketSize = cpu_to_le16(512), 485 }; 486 487 static struct usb_endpoint_descriptor 488 fsg_hs_bulk_out_desc = { 489 .bLength = USB_DT_ENDPOINT_SIZE, 490 .bDescriptorType = USB_DT_ENDPOINT, 491 492 /* bEndpointAddress copied from fs_bulk_out_desc during fsg_bind() */ 493 .bmAttributes = USB_ENDPOINT_XFER_BULK, 494 .wMaxPacketSize = cpu_to_le16(512), 495 .bInterval = 1, /* NAK every 1 uframe */ 496 }; 497 498 #ifndef FSG_NO_INTR_EP 499 500 static struct usb_endpoint_descriptor 501 fsg_hs_intr_in_desc = { 502 .bLength = USB_DT_ENDPOINT_SIZE, 503 .bDescriptorType = USB_DT_ENDPOINT, 504 505 /* bEndpointAddress copied from fs_intr_in_desc during fsg_bind() */ 506 .bmAttributes = USB_ENDPOINT_XFER_INT, 507 .wMaxPacketSize = cpu_to_le16(2), 508 .bInterval = 9, /* 2**(9-1) = 256 uframes -> 32 ms */ 509 }; 510 511 #ifndef FSG_NO_OTG 512 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 2 513 #else 514 # define FSG_HS_FUNCTION_PRE_EP_ENTRIES 1 515 #endif 516 517 #endif 518 519 static struct usb_descriptor_header *fsg_hs_function[] = { 520 #ifndef FSG_NO_OTG 521 (struct usb_descriptor_header *) &fsg_otg_desc, 522 #endif 523 (struct usb_descriptor_header *) &fsg_intf_desc, 524 (struct usb_descriptor_header *) &fsg_hs_bulk_in_desc, 525 (struct usb_descriptor_header *) &fsg_hs_bulk_out_desc, 526 #ifndef FSG_NO_INTR_EP 527 (struct usb_descriptor_header *) &fsg_hs_intr_in_desc, 528 #endif 529 NULL, 530 }; 531 532 /* Maxpacket and other transfer characteristics vary by speed. */ 533 static struct usb_endpoint_descriptor * 534 fsg_ep_desc(struct usb_gadget *g, struct usb_endpoint_descriptor *fs, 535 struct usb_endpoint_descriptor *hs) 536 { 537 if (gadget_is_dualspeed(g) && g->speed == USB_SPEED_HIGH) 538 return hs; 539 return fs; 540 } 541 542 /* Static strings, in UTF-8 (for simplicity we use only ASCII characters) */ 543 static struct usb_string fsg_strings[] = { 544 #ifndef FSG_NO_DEVICE_STRINGS 545 {FSG_STRING_MANUFACTURER, fsg_string_manufacturer}, 546 {FSG_STRING_PRODUCT, fsg_string_product}, 547 {FSG_STRING_SERIAL, fsg_string_serial}, 548 {FSG_STRING_CONFIG, fsg_string_config}, 549 #endif 550 {FSG_STRING_INTERFACE, fsg_string_interface}, 551 {} 552 }; 553 554 static struct usb_gadget_strings fsg_stringtab = { 555 .language = 0x0409, /* en-us */ 556 .strings = fsg_strings, 557 }; 558 559 /*-------------------------------------------------------------------------*/ 560 561 /* 562 * If the next two routines are called while the gadget is registered, 563 * the caller must own fsg->filesem for writing. 564 */ 565 566 static int fsg_lun_open(struct fsg_lun *curlun, unsigned int num_sectors, 567 const char *filename) 568 { 569 int ro; 570 571 /* R/W if we can, R/O if we must */ 572 ro = curlun->initially_ro; 573 574 curlun->ro = ro; 575 curlun->file_length = num_sectors << 9; 576 curlun->num_sectors = num_sectors; 577 debug("open backing file: %s\n", filename); 578 579 return 0; 580 } 581 582 static void fsg_lun_close(struct fsg_lun *curlun) 583 { 584 } 585 586 /*-------------------------------------------------------------------------*/ 587 588 /* 589 * Sync the file data, don't bother with the metadata. 590 * This code was copied from fs/buffer.c:sys_fdatasync(). 591 */ 592 static int fsg_lun_fsync_sub(struct fsg_lun *curlun) 593 { 594 return 0; 595 } 596 597 static void store_cdrom_address(u8 *dest, int msf, u32 addr) 598 { 599 if (msf) { 600 /* Convert to Minutes-Seconds-Frames */ 601 addr >>= 2; /* Convert to 2048-byte frames */ 602 addr += 2*75; /* Lead-in occupies 2 seconds */ 603 dest[3] = addr % 75; /* Frames */ 604 addr /= 75; 605 dest[2] = addr % 60; /* Seconds */ 606 addr /= 60; 607 dest[1] = addr; /* Minutes */ 608 dest[0] = 0; /* Reserved */ 609 } else { 610 /* Absolute sector */ 611 put_unaligned_be32(addr, dest); 612 } 613 } 614 615 /*-------------------------------------------------------------------------*/ 616