drivers/isdn/hysdn/hysdn_boot.c

   1 /* $Id: hysdn_boot.c,v 1.4.6.4 2001/09/23 22:24:54 kai Exp $
   2  *
   3  * Linux driver for HYSDN cards
   4  * specific routines for booting and pof handling
   5  *
   6  * Author    Werner Cornelius (werner@titro.de) for Hypercope GmbH
   7  * Copyright 1999 by Werner Cornelius (werner@titro.de)
   8  *
   9  * This software may be used and distributed according to the terms
  10  * of the GNU General Public License, incorporated herein by reference.
  11  *
  12  */
  13
  14 #include <linux/vmalloc.h>
  15 #include <linux/slab.h>
  16 #include <linux/uaccess.h>
  17
  18 #include "hysdn_defs.h"
  19 #include "hysdn_pof.h"
  20
  21 /********************************/
  22 /* defines for pof read handler */
  23 /********************************/
  24 #define POF_READ_FILE_HEAD  0
  25 #define POF_READ_TAG_HEAD   1
  26 #define POF_READ_TAG_DATA   2
  27
  28 /************************************************************/
  29 /* definition of boot specific data area. This data is only */
  30 /* needed during boot and so allocated dynamically.         */
  31 /************************************************************/
  32 struct boot_data {
  33         unsigned short Cryptor; /* for use with Decrypt function */
  34         unsigned short Nrecs;   /* records remaining in file */
  35         unsigned char pof_state;/* actual state of read handler */
  36         unsigned char is_crypted;/* card data is crypted */
  37         int BufSize;            /* actual number of bytes bufferd */
  38         int last_error;         /* last occurred error */
  39         unsigned short pof_recid;/* actual pof recid */
  40         unsigned long pof_reclen;/* total length of pof record data */
  41         unsigned long pof_recoffset;/* actual offset inside pof record */
  42         union {
  43                 unsigned char BootBuf[BOOT_BUF_SIZE];/* buffer as byte count */
  44                 tPofRecHdr PofRecHdr;   /* header for actual record/chunk */
  45                 tPofFileHdr PofFileHdr;         /* header from POF file */
  46                 tPofTimeStamp PofTime;  /* time information */
  47         } buf;
  48 };
  49
  50 /*****************************************************/
  51 /*  start decryption of successive POF file chuncks.  */
  52 /*                                                   */
  53 /*  to be called at start of POF file reading,       */
  54 /*  before starting any decryption on any POF record. */
  55 /*****************************************************/
  56 static void
  57 StartDecryption(struct boot_data *boot)
  58 {
  59         boot->Cryptor = CRYPT_STARTTERM;
  60 }                               /* StartDecryption */
  61
  62
  63 /***************************************************************/
  64 /* decrypt complete BootBuf                                    */
  65 /* NOTE: decryption must be applied to all or none boot tags - */
  66 /*       to HI and LO boot loader and (all) seq tags, because  */
  67 /*       global Cryptor is started for whole POF.              */
  68 /***************************************************************/
  69 static void
  70 DecryptBuf(struct boot_data *boot, int cnt)
  71 {
  72         unsigned char *bufp = boot->buf.BootBuf;
  73
  74         while (cnt--) {
  75                 boot->Cryptor = (boot->Cryptor >> 1) ^ ((boot->Cryptor & 1U) ? CRYPT_FEEDTERM : 0);
  76                 *bufp++ ^= (unsigned char)boot->Cryptor;
  77         }
  78 }                               /* DecryptBuf */
  79
  80 /********************************************************************************/
  81 /* pof_handle_data executes the required actions dependent on the active record */
  82 /* id. If successful 0 is returned, a negative value shows an error.           */
  83 /********************************************************************************/
  84 static int
  85 pof_handle_data(hysdn_card *card, int datlen)
  86 {
  87         struct boot_data *boot = card->boot;    /* pointer to boot specific data */
  88         long l;
  89         unsigned char *imgp;
  90         int img_len;
  91
  92         /* handle the different record types */
  93         switch (boot->pof_recid) {
  94
  95         case TAG_TIMESTMP:
  96                 if (card->debug_flags & LOG_POF_RECORD)
  97                         hysdn_addlog(card, "POF created %s", boot->buf.PofTime.DateTimeText);
  98                 break;
  99
 100         case TAG_CBOOTDTA:
 101                 DecryptBuf(boot, datlen);       /* we need to encrypt the buffer */
 102         case TAG_BOOTDTA:
 103                 if (card->debug_flags & LOG_POF_RECORD)
 104                         hysdn_addlog(card, "POF got %s len=%d offs=0x%lx",
 105                                      (boot->pof_recid == TAG_CBOOTDTA) ? "CBOOTDATA" : "BOOTDTA",
 106                                      datlen, boot->pof_recoffset);
 107
 108                 if (boot->pof_reclen != POF_BOOT_LOADER_TOTAL_SIZE) {
 109                         boot->last_error = EPOF_BAD_IMG_SIZE;   /* invalid length */
 110                         return (boot->last_error);
 111                 }
 112                 imgp = boot->buf.BootBuf;       /* start of buffer */
 113                 img_len = datlen;       /* maximum length to transfer */
 114
 115                 l = POF_BOOT_LOADER_OFF_IN_PAGE -
 116                         (boot->pof_recoffset & (POF_BOOT_LOADER_PAGE_SIZE - 1));
 117                 if (l > 0) {
 118                         /* buffer needs to be truncated */
 119                         imgp += l;      /* advance pointer */
 120                         img_len -= l;   /* adjust len */
 121                 }
 122                 /* at this point no special handling for data wrapping over buffer */
 123                 /* is necessary, because the boot image always will be adjusted to */
 124                 /* match a page boundary inside the buffer.                        */
 125                 /* The buffer for the boot image on the card is filled in 2 cycles */
 126                 /* first the 1024 hi-words are put in the buffer, then the low 1024 */
 127                 /* word are handled in the same way with different offset.         */
 128
 129                 if (img_len > 0) {
 130                         /* data available for copy */
 131                         if ((boot->last_error =
 132                              card->writebootimg(card, imgp,
 133                                                 (boot->pof_recoffset > POF_BOOT_LOADER_PAGE_SIZE) ? 2 : 0)) < 0)
 134                                 return (boot->last_error);
 135                 }
 136                 break;  /* end of case boot image hi/lo */
 137
 138         case TAG_CABSDATA:
 139                 DecryptBuf(boot, datlen);       /* we need to encrypt the buffer */
 140         case TAG_ABSDATA:
 141                 if (card->debug_flags & LOG_POF_RECORD)
 142                         hysdn_addlog(card, "POF got %s len=%d offs=0x%lx",
 143                                      (boot->pof_recid == TAG_CABSDATA) ? "CABSDATA" : "ABSDATA",
 144                                      datlen, boot->pof_recoffset);
 145
 146                 if ((boot->last_error = card->writebootseq(card, boot->buf.BootBuf, datlen)) < 0)
 147                         return (boot->last_error);      /* error writing data */
 148
 149                 if (boot->pof_recoffset + datlen >= boot->pof_reclen)
 150                         return (card->waitpofready(card));      /* data completely spooled, wait for ready */
 151
 152                 break;  /* end of case boot seq data */
 153
 154         default:
 155                 if (card->debug_flags & LOG_POF_RECORD)
 156                         hysdn_addlog(card, "POF got data(id=0x%lx) len=%d offs=0x%lx", boot->pof_recid,
 157                                      datlen, boot->pof_recoffset);
 158
 159                 break;  /* simply skip record */
 160         }                       /* switch boot->pof_recid */
 161
 162         return (0);
 163 }                               /* pof_handle_data */
 164
 165
 166 /******************************************************************************/
 167 /* pof_write_buffer is called when the buffer has been filled with the needed */
 168 /* number of data bytes. The number delivered is additionally supplied for    */
 169 /* verification. The functions handles the data and returns the needed number */
 170 /* of bytes for the next action. If the returned value is 0 or less an error  */
 171 /* occurred and booting must be aborted.                                       */
 172 /******************************************************************************/
 173 int
 174 pof_write_buffer(hysdn_card *card, int datlen)
 175 {
 176         struct boot_data *boot = card->boot;    /* pointer to boot specific data */
 177
 178         if (!boot)
 179                 return (-EFAULT);       /* invalid call */
 180         if (boot->last_error < 0)
 181                 return (boot->last_error);      /* repeated error */
 182
 183         if (card->debug_flags & LOG_POF_WRITE)
 184                 hysdn_addlog(card, "POF write: got %d bytes ", datlen);
 185
 186         switch (boot->pof_state) {
 187         case POF_READ_FILE_HEAD:
 188                 if (card->debug_flags & LOG_POF_WRITE)
 189                         hysdn_addlog(card, "POF write: checking file header");
 190
 191                 if (datlen != sizeof(tPofFileHdr)) {
 192                         boot->last_error = -EPOF_INTERNAL;
 193                         break;
 194                 }
 195                 if (boot->buf.PofFileHdr.Magic != TAGFILEMAGIC) {
 196                         boot->last_error = -EPOF_BAD_MAGIC;
 197                         break;
 198                 }
 199                 /* Setup the new state and vars */
 200                 boot->Nrecs = (unsigned short)(boot->buf.PofFileHdr.N_PofRecs); /* limited to 65535 */
 201                 boot->pof_state = POF_READ_TAG_HEAD;    /* now start with single tags */
 202                 boot->last_error = sizeof(tPofRecHdr);  /* new length */
 203                 break;
 204
 205         case POF_READ_TAG_HEAD:
 206                 if (card->debug_flags & LOG_POF_WRITE)
 207                         hysdn_addlog(card, "POF write: checking tag header");
 208
 209                 if (datlen != sizeof(tPofRecHdr)) {
 210                         boot->last_error = -EPOF_INTERNAL;
 211                         break;
 212                 }
 213                 boot->pof_recid = boot->buf.PofRecHdr.PofRecId;         /* actual pof recid */
 214                 boot->pof_reclen = boot->buf.PofRecHdr.PofRecDataLen;   /* total length */
 215                 boot->pof_recoffset = 0;        /* no starting offset */
 216
 217                 if (card->debug_flags & LOG_POF_RECORD)
 218                         hysdn_addlog(card, "POF: got record id=0x%lx length=%ld ",
 219                                      boot->pof_recid, boot->pof_reclen);
 220
 221                 boot->pof_state = POF_READ_TAG_DATA;    /* now start with tag data */
 222                 if (boot->pof_reclen < BOOT_BUF_SIZE)
 223                         boot->last_error = boot->pof_reclen;    /* limit size */
 224                 else
 225                         boot->last_error = BOOT_BUF_SIZE;       /* maximum */
 226
 227                 if (!boot->last_error) {        /* no data inside record */
 228                         boot->pof_state = POF_READ_TAG_HEAD;    /* now start with single tags */
 229                         boot->last_error = sizeof(tPofRecHdr);  /* new length */
 230                 }
 231                 break;
 232
 233         case POF_READ_TAG_DATA:
 234                 if (card->debug_flags & LOG_POF_WRITE)
 235                         hysdn_addlog(card, "POF write: getting tag data");
 236
 237                 if (datlen != boot->last_error) {
 238                         boot->last_error = -EPOF_INTERNAL;
 239                         break;
 240                 }
 241                 if ((boot->last_error = pof_handle_data(card, datlen)) < 0)
 242                         return (boot->last_error);      /* an error occurred */
 243                 boot->pof_recoffset += datlen;
 244                 if (boot->pof_recoffset >= boot->pof_reclen) {
 245                         boot->pof_state = POF_READ_TAG_HEAD;    /* now start with single tags */
 246                         boot->last_error = sizeof(tPofRecHdr);  /* new length */
 247                 } else {
 248                         if (boot->pof_reclen - boot->pof_recoffset < BOOT_BUF_SIZE)
 249                                 boot->last_error = boot->pof_reclen - boot->pof_recoffset;      /* limit size */
 250                         else
 251                                 boot->last_error = BOOT_BUF_SIZE;       /* maximum */
 252                 }
 253                 break;
 254
 255         default:
 256                 boot->last_error = -EPOF_INTERNAL;      /* unknown state */
 257                 break;
 258         }                       /* switch (boot->pof_state) */
 259
 260         return (boot->last_error);
 261 }                               /* pof_write_buffer */
 262
 263
 264 /*******************************************************************************/
 265 /* pof_write_open is called when an open for boot on the cardlog device occurs. */
 266 /* The function returns the needed number of bytes for the next operation. If  */
 267 /* the returned number is less or equal 0 an error specified by this code      */
 268 /* occurred. Additionally the pointer to the buffer data area is set on success */
 269 /*******************************************************************************/
 270 int
 271 pof_write_open(hysdn_card *card, unsigned char **bufp)
 272 {
 273         struct boot_data *boot; /* pointer to boot specific data */
 274
 275         if (card->boot) {
 276                 if (card->debug_flags & LOG_POF_OPEN)
 277                         hysdn_addlog(card, "POF open: already opened for boot");
 278                 return (-ERR_ALREADY_BOOT);     /* boot already active */
 279         }
 280         /* error no mem available */
 281         if (!(boot = kzalloc(sizeof(struct boot_data), GFP_KERNEL))) {
 282                 if (card->debug_flags & LOG_MEM_ERR)
 283                         hysdn_addlog(card, "POF open: unable to allocate mem");
 284                 return (-EFAULT);
 285         }
 286         card->boot = boot;
 287         card->state = CARD_STATE_BOOTING;
 288
 289         card->stopcard(card);   /* first stop the card */
 290         if (card->testram(card)) {
 291                 if (card->debug_flags & LOG_POF_OPEN)
 292                         hysdn_addlog(card, "POF open: DPRAM test failure");
 293                 boot->last_error = -ERR_BOARD_DPRAM;
 294                 card->state = CARD_STATE_BOOTERR;       /* show boot error */
 295                 return (boot->last_error);
 296         }
 297         boot->BufSize = 0;      /* Buffer is empty */
 298         boot->pof_state = POF_READ_FILE_HEAD;   /* read file header */
 299         StartDecryption(boot);  /* if POF File should be encrypted */
 300
 301         if (card->debug_flags & LOG_POF_OPEN)
 302                 hysdn_addlog(card, "POF open: success");
 303
 304         *bufp = boot->buf.BootBuf;      /* point to buffer */
 305         return (sizeof(tPofFileHdr));
 306 }                               /* pof_write_open */
 307
 308 /********************************************************************************/
 309 /* pof_write_close is called when an close of boot on the cardlog device occurs. */
 310 /* The return value must be 0 if everything has happened as desired.            */
 311 /********************************************************************************/
 312 int
 313 pof_write_close(hysdn_card *card)
 314 {
 315         struct boot_data *boot = card->boot;    /* pointer to boot specific data */
 316
 317         if (!boot)
 318                 return (-EFAULT);       /* invalid call */
 319
 320         card->boot = NULL;      /* no boot active */
 321         kfree(boot);
 322
 323         if (card->state == CARD_STATE_RUN)
 324                 card->set_errlog_state(card, 1);        /* activate error log */
 325
 326         if (card->debug_flags & LOG_POF_OPEN)
 327                 hysdn_addlog(card, "POF close: success");
 328
 329         return (0);
 330 }                               /* pof_write_close */
 331
 332 /*********************************************************************************/
 333 /* EvalSysrTokData checks additional records delivered with the Sysready Message */
 334 /* when POF has been booted. A return value of 0 is used if no error occurred.    */
 335 /*********************************************************************************/
 336 int
 337 EvalSysrTokData(hysdn_card *card, unsigned char *cp, int len)
 338 {
 339         u_char *p;
 340         u_char crc;
 341
 342         if (card->debug_flags & LOG_POF_RECORD)
 343                 hysdn_addlog(card, "SysReady Token data length %d", len);
 344
 345         if (len < 2) {
 346                 hysdn_addlog(card, "SysReady Token Data to short");
 347                 return (1);
 348         }
 349         for (p = cp, crc = 0; p < (cp + len - 2); p++)
 350                 if ((crc & 0x80))
 351                         crc = (((u_char) (crc << 1)) + 1) + *p;
 352                 else
 353                         crc = ((u_char) (crc << 1)) + *p;
 354         crc = ~crc;
 355         if (crc != *(cp + len - 1)) {
 356                 hysdn_addlog(card, "SysReady Token Data invalid CRC");
 357                 return (1);
 358         }
 359         len--;                  /* don't check CRC byte */
 360         while (len > 0) {
 361
 362                 if (*cp == SYSR_TOK_END)
 363                         return (0);     /* End of Token stream */
 364
 365                 if (len < (*(cp + 1) + 2)) {
 366                         hysdn_addlog(card, "token 0x%x invalid length %d", *cp, *(cp + 1));
 367                         return (1);
 368                 }
 369                 switch (*cp) {
 370                 case SYSR_TOK_B_CHAN:   /* 1 */
 371                         if (*(cp + 1) != 1)
 372                                 return (1);     /* length invalid */
 373                         card->bchans = *(cp + 2);
 374                         break;
 375
 376                 case SYSR_TOK_FAX_CHAN: /* 2 */
 377                         if (*(cp + 1) != 1)
 378                                 return (1);     /* length invalid */
 379                         card->faxchans = *(cp + 2);
 380                         break;
 381
 382                 case SYSR_TOK_MAC_ADDR: /* 3 */
 383                         if (*(cp + 1) != 6)
 384                                 return (1);     /* length invalid */
 385                         memcpy(card->mac_addr, cp + 2, 6);
 386                         break;
 387
 388                 default:
 389                         hysdn_addlog(card, "unknown token 0x%02x length %d", *cp, *(cp + 1));
 390                         break;
 391                 }
 392                 len -= (*(cp + 1) + 2);         /* adjust len */
 393                 cp += (*(cp + 1) + 2);  /* and pointer */
 394         }
 395
 396         hysdn_addlog(card, "no end token found");
 397         return (1);
 398 }                               /* EvalSysrTokData */