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Committer: Michael Beasley <mike@snafu.setup>
[mikesnafu-overlay.git] / drivers / isdn / hysdn / hysdn_boot.c
blobbe787e16bb79b99b7e501aca2e395b09e235fa86
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 <asm/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 */
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