1 /*
2 * CMOS/NV-RAM driver for Linux
3 *
4 * Copyright (C) 1997 Roman Hodek <Roman.Hodek@informatik.uni-erlangen.de>
5 * idea by and with help from Richard Jelinek <rj@suse.de>
6 * Portions copyright (c) 2001,2002 Sun Microsystems (thockin@sun.com)
7 *
8 * This driver allows you to access the contents of the non-volatile memory in
9 * the mc146818rtc.h real-time clock. This chip is built into all PCs and into
10 * many Atari machines. In the former it's called "CMOS-RAM", in the latter
11 * "NVRAM" (NV stands for non-volatile).
12 *
13 * The data are supplied as a (seekable) character device, /dev/nvram. The
14 * size of this file is dependant on the controller. The usual size is 114,
15 * the number of freely available bytes in the memory (i.e., not used by the
16 * RTC itself).
17 *
18 * Checksums over the NVRAM contents are managed by this driver. In case of a
19 * bad checksum, reads and writes return -EIO. The checksum can be initialized
20 * to a sane state either by ioctl(NVRAM_INIT) (clear whole NVRAM) or
21 * ioctl(NVRAM_SETCKS) (doesn't change contents, just makes checksum valid
22 * again; use with care!)
23 *
24 * This file also provides some functions for other parts of the kernel that
25 * want to access the NVRAM: nvram_{read,write,check_checksum,set_checksum}.
26 * Obviously this can be used only if this driver is always configured into
27 * the kernel and is not a module. Since the functions are used by some Atari
28 * drivers, this is the case on the Atari.
29 *
30 *
31 * 1.1 Cesar Barros: SMP locking fixes
32 * added changelog
33 * 1.2 Erik Gilling: Cobalt Networks support
34 * Tim Hockin: general cleanup, Cobalt support
35 */
36
37 #define NVRAM_VERSION "1.2"
38
39 #include <linux/module.h>
40 #include <linux/config.h>
41 #include <linux/sched.h>
42 #include <linux/smp_lock.h>
43 #include <linux/nvram.h>
44
45 #define PC 1
46 #define ATARI 2
47 #define COBALT 3
48
49 /* select machine configuration */
50 #if defined(CONFIG_ATARI)
51 # define MACH ATARI
52 #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */
53 #define MACH PC
54 # if defined(CONFIG_COBALT)
55 # include <linux/cobalt-nvram.h>
56 # define MACH COBALT
57 # else
58 # define MACH PC
59 # endif
60 #else
61 # error Cannot build nvram driver for this machine configuration.
62 #endif
63
64 #if MACH == PC
65
66 /* RTC in a PC */
67 #define CHECK_DRIVER_INIT() 1
68
69 /* On PCs, the checksum is built only over bytes 2..31 */
70 #define PC_CKS_RANGE_START 2
71 #define PC_CKS_RANGE_END 31
72 #define PC_CKS_LOC 32
73 #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
74
75 #define mach_check_checksum pc_check_checksum
76 #define mach_set_checksum pc_set_checksum
77 #define mach_proc_infos pc_proc_infos
78
79 #endif
80
81 #if MACH == COBALT
82
83 #define CHECK_DRIVER_INIT() 1
84
85 #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
86
87 #define mach_check_checksum cobalt_check_checksum
88 #define mach_set_checksum cobalt_set_checksum
89 #define mach_proc_infos cobalt_proc_infos
90
91 #endif
92
93 #if MACH == ATARI
94
95 /* Special parameters for RTC in Atari machines */
96 #include <asm/atarihw.h>
97 #include <asm/atariints.h>
98 #define RTC_PORT(x) (TT_RTC_BAS + 2*(x))
99 #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK))
100
101 #define NVRAM_BYTES 50
102
103 /* On Ataris, the checksum is over all bytes except the checksum bytes
104 * themselves; these are at the very end */
105 #define ATARI_CKS_RANGE_START 0
106 #define ATARI_CKS_RANGE_END 47
107 #define ATARI_CKS_LOC 48
108
109 #define mach_check_checksum atari_check_checksum
110 #define mach_set_checksum atari_set_checksum
111 #define mach_proc_infos atari_proc_infos
112
113 #endif
114
115 /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
116 * rtc_lock held. Due to the index-port/data-port design of the RTC, we
117 * don't want two different things trying to get to it at once. (e.g. the
118 * periodic 11 min sync from time.c vs. this driver.)
119 */
120
121 #include <linux/types.h>
122 #include <linux/errno.h>
123 #include <linux/miscdevice.h>
124 #include <linux/slab.h>
125 #include <linux/ioport.h>
126 #include <linux/fcntl.h>
127 #include <linux/mc146818rtc.h>
128 #include <linux/init.h>
129 #include <linux/proc_fs.h>
130 #include <linux/spinlock.h>
131
132 #include <asm/io.h>
133 #include <asm/uaccess.h>
134 #include <asm/system.h>
135
136 static spinlock_t nvram_state_lock = SPIN_LOCK_UNLOCKED;
137 static int nvram_open_cnt; /* #times opened */
138 static int nvram_open_mode; /* special open modes */
139 #define NVRAM_WRITE 1 /* opened for writing (exclusive) */
140 #define NVRAM_EXCL 2 /* opened with O_EXCL */
141
142 static int mach_check_checksum(void);
143 static void mach_set_checksum(void);
144
145 #ifdef CONFIG_PROC_FS
146 static int mach_proc_infos(unsigned char *contents, char *buffer, int *len,
147 off_t *begin, off_t offset, int size);
148 #endif
149
150 /*
151 * These functions are provided to be called internally or by other parts of
152 * the kernel. It's up to the caller to ensure correct checksum before reading
153 * or after writing (needs to be done only once).
154 *
155 * It is worth noting that these functions all access bytes of general
156 * purpose memory in the NVRAM - that is to say, they all add the
157 * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
158 * know about the RTC cruft.
159 */
160
161 unsigned char
__nvram_read_byte(int i)162 __nvram_read_byte(int i)
163 {
164 return CMOS_READ(NVRAM_FIRST_BYTE + i);
165 }
166
167 unsigned char
nvram_read_byte(int i)168 nvram_read_byte(int i)
169 {
170 unsigned long flags;
171 unsigned char c;
172
173 spin_lock_irqsave(&rtc_lock, flags);
174 c = __nvram_read_byte(i);
175 spin_unlock_irqrestore(&rtc_lock, flags);
176 return c;
177 }
178
179 /* This races nicely with trying to read with checksum checking (nvram_read) */
180 void
__nvram_write_byte(unsigned char c,int i)181 __nvram_write_byte(unsigned char c, int i)
182 {
183 CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
184 }
185
186 void
nvram_write_byte(unsigned char c,int i)187 nvram_write_byte(unsigned char c, int i)
188 {
189 unsigned long flags;
190
191 spin_lock_irqsave(&rtc_lock, flags);
192 __nvram_write_byte(c, i);
193 spin_unlock_irqrestore(&rtc_lock, flags);
194 }
195
196 int
__nvram_check_checksum(void)197 __nvram_check_checksum(void)
198 {
199 return mach_check_checksum();
200 }
201
202 int
nvram_check_checksum(void)203 nvram_check_checksum(void)
204 {
205 unsigned long flags;
206 int rv;
207
208 spin_lock_irqsave(&rtc_lock, flags);
209 rv = __nvram_check_checksum();
210 spin_unlock_irqrestore(&rtc_lock, flags);
211 return rv;
212 }
213
214 void
__nvram_set_checksum(void)215 __nvram_set_checksum(void)
216 {
217 mach_set_checksum();
218 }
219
220 void
nvram_set_checksum(void)221 nvram_set_checksum(void)
222 {
223 unsigned long flags;
224
225 spin_lock_irqsave(&rtc_lock, flags);
226 __nvram_set_checksum();
227 spin_unlock_irqrestore(&rtc_lock, flags);
228 }
229
230 /*
231 * The are the file operation function for user access to /dev/nvram
232 */
233
234 static long long
nvram_llseek(struct file * file,loff_t offset,int origin)235 nvram_llseek(struct file *file, loff_t offset, int origin)
236 {
237 switch (origin) {
238 case 0:
239 /* nothing to do */
240 break;
241 case 1:
242 offset += file->f_pos;
243 break;
244 case 2:
245 offset += NVRAM_BYTES;
246 break;
247 }
248 return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;
249 }
250
251 static ssize_t
nvram_read(struct file * file,char * buf,size_t count,loff_t * ppos)252 nvram_read(struct file *file, char *buf, size_t count, loff_t *ppos)
253 {
254 unsigned char contents[NVRAM_BYTES];
255 loff_t n = *ppos;
256 unsigned i = n;
257 unsigned char *tmp;
258
259 if (i != n || i >= NVRAM_BYTES)
260 return 0;
261
262 spin_lock_irq(&rtc_lock);
263
264 if (!__nvram_check_checksum())
265 goto checksum_err;
266
267 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
268 *tmp = __nvram_read_byte(i);
269
270 spin_unlock_irq(&rtc_lock);
271
272 if (copy_to_user(buf, contents, tmp - contents))
273 return -EFAULT;
274
275 *ppos = i;
276
277 return tmp - contents;
278
279 checksum_err:
280 spin_unlock_irq(&rtc_lock);
281 return -EIO;
282 }
283
284 static ssize_t
nvram_write(struct file * file,const char * buf,size_t count,loff_t * ppos)285 nvram_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
286 {
287 unsigned char contents[NVRAM_BYTES];
288 loff_t n = *ppos;
289 unsigned i = n;
290 unsigned char *tmp;
291 int len;
292
293 if (i != n || i >= NVRAM_BYTES)
294 return 0;
295
296 len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count;
297 if (copy_from_user(contents, buf, len))
298 return -EFAULT;
299
300 spin_lock_irq(&rtc_lock);
301
302 if (!__nvram_check_checksum())
303 goto checksum_err;
304
305 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
306 __nvram_write_byte(*tmp, i);
307
308 __nvram_set_checksum();
309
310 spin_unlock_irq(&rtc_lock);
311
312 *ppos = i;
313
314 return tmp - contents;
315
316 checksum_err:
317 spin_unlock_irq(&rtc_lock);
318 return -EIO;
319 }
320
321 static int
nvram_ioctl(struct inode * inode,struct file * file,unsigned int cmd,unsigned long arg)322 nvram_ioctl(struct inode *inode, struct file *file,
323 unsigned int cmd, unsigned long arg)
324 {
325 int i;
326
327 switch (cmd) {
328
329 case NVRAM_INIT:
330 /* initialize NVRAM contents and checksum */
331 if (!capable(CAP_SYS_ADMIN))
332 return -EACCES;
333
334 spin_lock_irq(&rtc_lock);
335
336 for (i = 0; i < NVRAM_BYTES; ++i)
337 __nvram_write_byte(0, i);
338 __nvram_set_checksum();
339
340 spin_unlock_irq(&rtc_lock);
341 return 0;
342
343 case NVRAM_SETCKS:
344 /* just set checksum, contents unchanged (maybe useful after
345 * checksum garbaged somehow...) */
346 if (!capable(CAP_SYS_ADMIN))
347 return -EACCES;
348
349 spin_lock_irq(&rtc_lock);
350 __nvram_set_checksum();
351 spin_unlock_irq(&rtc_lock);
352 return 0;
353
354 default:
355 return -ENOTTY;
356 }
357 }
358
359 static int
nvram_open(struct inode * inode,struct file * file)360 nvram_open(struct inode *inode, struct file *file)
361 {
362 spin_lock(&nvram_state_lock);
363
364 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
365 (nvram_open_mode & NVRAM_EXCL) ||
366 ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) {
367 spin_unlock(&nvram_state_lock);
368 return -EBUSY;
369 }
370
371 if (file->f_flags & O_EXCL)
372 nvram_open_mode |= NVRAM_EXCL;
373 if (file->f_mode & 2)
374 nvram_open_mode |= NVRAM_WRITE;
375 nvram_open_cnt++;
376
377 spin_unlock(&nvram_state_lock);
378
379 return 0;
380 }
381
382 static int
nvram_release(struct inode * inode,struct file * file)383 nvram_release(struct inode *inode, struct file *file)
384 {
385 spin_lock(&nvram_state_lock);
386
387 nvram_open_cnt--;
388
389 /* if only one instance is open, clear the EXCL bit */
390 if (nvram_open_mode & NVRAM_EXCL)
391 nvram_open_mode &= ~NVRAM_EXCL;
392 if (file->f_mode & 2)
393 nvram_open_mode &= ~NVRAM_WRITE;
394
395 spin_unlock(&nvram_state_lock);
396
397 return 0;
398 }
399
400 #ifndef CONFIG_PROC_FS
401 static int
nvram_read_proc(char * buffer,char ** start,off_t offset,int size,int * eof,void * data)402 nvram_read_proc(char *buffer, char **start, off_t offset,
403 int size, int *eof, void *data)
404 {
405 return 0;
406 }
407 #else
408
409 static int
nvram_read_proc(char * buffer,char ** start,off_t offset,int size,int * eof,void * data)410 nvram_read_proc(char *buffer, char **start, off_t offset,
411 int size, int *eof, void *data)
412 {
413 unsigned char contents[NVRAM_BYTES];
414 int i, len = 0;
415 off_t begin = 0;
416
417 spin_lock_irq(&rtc_lock);
418 for (i = 0; i < NVRAM_BYTES; ++i)
419 contents[i] = __nvram_read_byte(i);
420 spin_unlock_irq(&rtc_lock);
421
422 *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size);
423
424 if (offset >= begin + len)
425 return 0;
426 *start = buffer + (offset - begin);
427 return (size < begin + len - offset) ? size : begin + len - offset;
428
429 }
430
431 /* This macro frees the machine specific function from bounds checking and
432 * this like that... */
433 #define PRINT_PROC(fmt,args...) \
434 do { \
435 *len += sprintf(buffer+*len, fmt, ##args); \
436 if (*begin + *len > offset + size) \
437 return 0; \
438 if (*begin + *len < offset) { \
439 *begin += *len; \
440 *len = 0; \
441 } \
442 } while(0)
443
444 #endif /* CONFIG_PROC_FS */
445
446 static struct file_operations nvram_fops = {
447 owner: THIS_MODULE,
448 llseek: nvram_llseek,
449 read: nvram_read,
450 write: nvram_write,
451 ioctl: nvram_ioctl,
452 open: nvram_open,
453 release: nvram_release,
454 };
455
456 static struct miscdevice nvram_dev = {
457 NVRAM_MINOR,
458 "nvram",
459 &nvram_fops
460 };
461
462 static int __init
nvram_init(void)463 nvram_init(void)
464 {
465 int ret;
466
467 /* First test whether the driver should init at all */
468 if (!CHECK_DRIVER_INIT())
469 return -ENXIO;
470
471 ret = misc_register(&nvram_dev);
472 if (ret) {
473 printk(KERN_ERR "nvram: can't misc_register on minor=%d\n",
474 NVRAM_MINOR);
475 goto out;
476 }
477 if (!create_proc_read_entry("driver/nvram", 0, 0, nvram_read_proc,
478 NULL)) {
479 printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
480 ret = -ENOMEM;
481 goto outmisc;
482 }
483 ret = 0;
484 printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n");
485 out:
486 return ret;
487 outmisc:
488 misc_deregister(&nvram_dev);
489 goto out;
490 }
491
492 static void __exit
nvram_cleanup_module(void)493 nvram_cleanup_module(void)
494 {
495 remove_proc_entry("driver/nvram", 0);
496 misc_deregister(&nvram_dev);
497 }
498
499 module_init(nvram_init);
500 module_exit(nvram_cleanup_module);
501
502 /*
503 * Machine specific functions
504 */
505
506 #if MACH == PC
507
508 static int
pc_check_checksum(void)509 pc_check_checksum(void)
510 {
511 int i;
512 unsigned short sum = 0;
513 unsigned short expect;
514
515 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
516 sum += __nvram_read_byte(i);
517 expect = __nvram_read_byte(PC_CKS_LOC)<<8 |
518 __nvram_read_byte(PC_CKS_LOC+1);
519 return ((sum & 0xffff) == expect);
520 }
521
522 static void
pc_set_checksum(void)523 pc_set_checksum(void)
524 {
525 int i;
526 unsigned short sum = 0;
527
528 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
529 sum += __nvram_read_byte(i);
530 __nvram_write_byte(sum >> 8, PC_CKS_LOC);
531 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);
532 }
533
534 #ifdef CONFIG_PROC_FS
535
536 static char *floppy_types[] = {
537 "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M",
538 "3.5'' 2.88M", "3.5'' 2.88M"
539 };
540
541 static char *gfx_types[] = {
542 "EGA, VGA, ... (with BIOS)",
543 "CGA (40 cols)",
544 "CGA (80 cols)",
545 "monochrome",
546 };
547
548 static int
pc_proc_infos(unsigned char * nvram,char * buffer,int * len,off_t * begin,off_t offset,int size)549 pc_proc_infos(unsigned char *nvram, char *buffer, int *len,
550 off_t *begin, off_t offset, int size)
551 {
552 int checksum;
553 int type;
554
555 spin_lock_irq(&rtc_lock);
556 checksum = __nvram_check_checksum();
557 spin_unlock_irq(&rtc_lock);
558
559 PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");
560
561 PRINT_PROC("# floppies : %d\n",
562 (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
563 PRINT_PROC("Floppy 0 type : ");
564 type = nvram[2] >> 4;
565 if (type < sizeof (floppy_types) / sizeof (*floppy_types))
566 PRINT_PROC("%s\n", floppy_types[type]);
567 else
568 PRINT_PROC("%d (unknown)\n", type);
569 PRINT_PROC("Floppy 1 type : ");
570 type = nvram[2] & 0x0f;
571 if (type < sizeof (floppy_types) / sizeof (*floppy_types))
572 PRINT_PROC("%s\n", floppy_types[type]);
573 else
574 PRINT_PROC("%d (unknown)\n", type);
575
576 PRINT_PROC("HD 0 type : ");
577 type = nvram[4] >> 4;
578 if (type)
579 PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type);
580 else
581 PRINT_PROC("none\n");
582
583 PRINT_PROC("HD 1 type : ");
584 type = nvram[4] & 0x0f;
585 if (type)
586 PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type);
587 else
588 PRINT_PROC("none\n");
589
590 PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
591 nvram[18] | (nvram[19] << 8),
592 nvram[20], nvram[25],
593 nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8));
594 PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
595 nvram[39] | (nvram[40] << 8),
596 nvram[41], nvram[46],
597 nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8));
598
599 PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8));
600 PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n",
601 nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));
602
603 PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]);
604
605 PRINT_PROC("FPU : %sinstalled\n",
606 (nvram[6] & 2) ? "" : "not ");
607
608 return 1;
609 }
610 #endif
611
612 #endif /* MACH == PC */
613
614 #if MACH == COBALT
615
616 /* the cobalt CMOS has a wider range of it's checksum */
cobalt_check_checksum(void)617 static int cobalt_check_checksum(void)
618 {
619 int i;
620 unsigned short sum = 0;
621 unsigned short expect;
622
623 for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) {
624 if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1)))
625 continue;
626
627 sum += __nvram_read_byte(i);
628 }
629 expect = __nvram_read_byte(COBT_CMOS_CHECKSUM) << 8 |
630 __nvram_read_byte(COBT_CMOS_CHECKSUM+1);
631 return ((sum & 0xffff) == expect);
632 }
633
cobalt_set_checksum(void)634 static void cobalt_set_checksum(void)
635 {
636 int i;
637 unsigned short sum = 0;
638
639 for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) {
640 if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1)))
641 continue;
642
643 sum += __nvram_read_byte(i);
644 }
645
646 __nvram_write_byte(sum >> 8, COBT_CMOS_CHECKSUM);
647 __nvram_write_byte(sum & 0xff, COBT_CMOS_CHECKSUM+1);
648 }
649
650 #ifdef CONFIG_PROC_FS
651
cobalt_proc_infos(unsigned char * nvram,char * buffer,int * len,off_t * begin,off_t offset,int size)652 static int cobalt_proc_infos(unsigned char *nvram, char *buffer, int *len,
653 off_t *begin, off_t offset, int size)
654 {
655 int i;
656 unsigned int checksum;
657 unsigned int flags;
658 char sernum[14];
659 char *key = "cNoEbTaWlOtR!";
660 unsigned char bto_csum;
661
662 spin_lock_irq(&rtc_lock);
663 checksum = __nvram_check_checksum();
664 spin_unlock_irq(&rtc_lock);
665
666 PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");
667
668 flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8
669 | nvram[COBT_CMOS_FLAG_BYTE_1];
670
671 PRINT_PROC("Console: %s\n",
672 flags & COBT_CMOS_CONSOLE_FLAG ? "on": "off");
673
674 PRINT_PROC("Firmware Debug Messages: %s\n",
675 flags & COBT_CMOS_DEBUG_FLAG ? "on": "off");
676
677 PRINT_PROC("Auto Prompt: %s\n",
678 flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off");
679
680 PRINT_PROC("Shutdown Status: %s\n",
681 flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty");
682
683 PRINT_PROC("Hardware Probe: %s\n",
684 flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full");
685
686 PRINT_PROC("System Fault: %sdetected\n",
687 flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not ");
688
689 PRINT_PROC("Panic on OOPS: %s\n",
690 flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no");
691
692 PRINT_PROC("Delayed Cache Initialization: %s\n",
693 flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no");
694
695 PRINT_PROC("Show Logo at Boot: %s\n",
696 flags & COBT_CMOS_NOLOGO_FLAG ? "no": "yes");
697
698 PRINT_PROC("Boot Method: ");
699 switch (nvram[COBT_CMOS_BOOT_METHOD]) {
700 case COBT_CMOS_BOOT_METHOD_DISK:
701 PRINT_PROC("disk\n");
702 break;
703
704 case COBT_CMOS_BOOT_METHOD_ROM:
705 PRINT_PROC("rom\n");
706 break;
707
708 case COBT_CMOS_BOOT_METHOD_NET:
709 PRINT_PROC("net\n");
710 break;
711
712 default:
713 PRINT_PROC("unknown\n");
714 break;
715 }
716
717 PRINT_PROC("Primary Boot Device: %d:%d\n",
718 nvram[COBT_CMOS_BOOT_DEV0_MAJ],
719 nvram[COBT_CMOS_BOOT_DEV0_MIN] );
720 PRINT_PROC("Secondary Boot Device: %d:%d\n",
721 nvram[COBT_CMOS_BOOT_DEV1_MAJ],
722 nvram[COBT_CMOS_BOOT_DEV1_MIN] );
723 PRINT_PROC("Tertiary Boot Device: %d:%d\n",
724 nvram[COBT_CMOS_BOOT_DEV2_MAJ],
725 nvram[COBT_CMOS_BOOT_DEV2_MIN] );
726
727 PRINT_PROC("Uptime: %d\n",
728 nvram[COBT_CMOS_UPTIME_0] << 24 |
729 nvram[COBT_CMOS_UPTIME_1] << 16 |
730 nvram[COBT_CMOS_UPTIME_2] << 8 |
731 nvram[COBT_CMOS_UPTIME_3]);
732
733 PRINT_PROC("Boot Count: %d\n",
734 nvram[COBT_CMOS_BOOTCOUNT_0] << 24 |
735 nvram[COBT_CMOS_BOOTCOUNT_1] << 16 |
736 nvram[COBT_CMOS_BOOTCOUNT_2] << 8 |
737 nvram[COBT_CMOS_BOOTCOUNT_3]);
738
739 /* 13 bytes of serial num */
740 for (i=0 ; i<13 ; i++) {
741 sernum[i] = nvram[COBT_CMOS_SYS_SERNUM_0 + i];
742 }
743 sernum[13] = '\0';
744
745 checksum = 0;
746 for (i=0 ; i<13 ; i++) {
747 checksum += sernum[i] ^ key[i];
748 }
749 checksum = ((checksum & 0x7f) ^ (0xd6)) & 0xff;
750
751 PRINT_PROC("Serial Number: %s", sernum);
752 if (checksum != nvram[COBT_CMOS_SYS_SERNUM_CSUM]) {
753 PRINT_PROC(" (invalid checksum)");
754 }
755 PRINT_PROC("\n");
756
757 PRINT_PROC("Rom Revison: %d.%d.%d\n", nvram[COBT_CMOS_ROM_REV_MAJ],
758 nvram[COBT_CMOS_ROM_REV_MIN], nvram[COBT_CMOS_ROM_REV_REV]);
759
760 PRINT_PROC("BTO Server: %d.%d.%d.%d", nvram[COBT_CMOS_BTO_IP_0],
761 nvram[COBT_CMOS_BTO_IP_1], nvram[COBT_CMOS_BTO_IP_2],
762 nvram[COBT_CMOS_BTO_IP_3]);
763 bto_csum = nvram[COBT_CMOS_BTO_IP_0] + nvram[COBT_CMOS_BTO_IP_1]
764 + nvram[COBT_CMOS_BTO_IP_2] + nvram[COBT_CMOS_BTO_IP_3];
765 if (bto_csum != nvram[COBT_CMOS_BTO_IP_CSUM]) {
766 PRINT_PROC(" (invalid checksum)");
767 }
768 PRINT_PROC("\n");
769
770 if (flags & COBT_CMOS_VERSION_FLAG
771 && nvram[COBT_CMOS_VERSION] >= COBT_CMOS_VER_BTOCODE) {
772 PRINT_PROC("BTO Code: 0x%x\n",
773 nvram[COBT_CMOS_BTO_CODE_0] << 24 |
774 nvram[COBT_CMOS_BTO_CODE_1] << 16 |
775 nvram[COBT_CMOS_BTO_CODE_2] << 8 |
776 nvram[COBT_CMOS_BTO_CODE_3]);
777 }
778
779 return 1;
780 }
781 #endif /* CONFIG_PROC_FS */
782
783 #endif /* MACH == COBALT */
784
785 #if MACH == ATARI
786
787 static int
atari_check_checksum(void)788 atari_check_checksum(void)
789 {
790 int i;
791 unsigned char sum = 0;
792
793 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
794 sum += __nvram_read_byte(i);
795 return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) &&
796 __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
797 }
798
799 static void
atari_set_checksum(void)800 atari_set_checksum(void)
801 {
802 int i;
803 unsigned char sum = 0;
804
805 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
806 sum += __nvram_read_byte(i);
807 __nvram_write_byte(~sum, ATARI_CKS_LOC);
808 __nvram_write_byte(sum, ATARI_CKS_LOC + 1);
809 }
810
811 #ifdef CONFIG_PROC_FS
812
813 static struct {
814 unsigned char val;
815 char *name;
816 } boot_prefs[] = {
817 { 0x80, "TOS" },
818 { 0x40, "ASV" },
819 { 0x20, "NetBSD (?)" },
820 { 0x10, "Linux" },
821 { 0x00, "unspecified" }
822 };
823
824 static char *languages[] = {
825 "English (US)",
826 "German",
827 "French",
828 "English (UK)",
829 "Spanish",
830 "Italian",
831 "6 (undefined)",
832 "Swiss (French)",
833 "Swiss (German)"
834 };
835
836 static char *dateformat[] = {
837 "MM%cDD%cYY",
838 "DD%cMM%cYY",
839 "YY%cMM%cDD",
840 "YY%cDD%cMM",
841 "4 (undefined)",
842 "5 (undefined)",
843 "6 (undefined)",
844 "7 (undefined)"
845 };
846
847 static char *colors[] = {
848 "2", "4", "16", "256", "65536", "??", "??", "??"
849 };
850
851 #define fieldsize(a) (sizeof(a)/sizeof(*a))
852
853 static int
atari_proc_infos(unsigned char * nvram,char * buffer,int * len,off_t * begin,off_t offset,int size)854 atari_proc_infos(unsigned char *nvram, char *buffer, int *len,
855 off_t *begin, off_t offset, int size)
856 {
857 int checksum = nvram_check_checksum();
858 int i;
859 unsigned vmode;
860
861 PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not ");
862
863 PRINT_PROC("Boot preference : ");
864 for (i = fieldsize(boot_prefs) - 1; i >= 0; --i) {
865 if (nvram[1] == boot_prefs[i].val) {
866 PRINT_PROC("%s\n", boot_prefs[i].name);
867 break;
868 }
869 }
870 if (i < 0)
871 PRINT_PROC("0x%02x (undefined)\n", nvram[1]);
872
873 PRINT_PROC("SCSI arbitration : %s\n",
874 (nvram[16] & 0x80) ? "on" : "off");
875 PRINT_PROC("SCSI host ID : ");
876 if (nvram[16] & 0x80)
877 PRINT_PROC("%d\n", nvram[16] & 7);
878 else
879 PRINT_PROC("n/a\n");
880
881 /* the following entries are defined only for the Falcon */
882 if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
883 return 1;
884
885 PRINT_PROC("OS language : ");
886 if (nvram[6] < fieldsize(languages))
887 PRINT_PROC("%s\n", languages[nvram[6]]);
888 else
889 PRINT_PROC("%u (undefined)\n", nvram[6]);
890 PRINT_PROC("Keyboard language: ");
891 if (nvram[7] < fieldsize(languages))
892 PRINT_PROC("%s\n", languages[nvram[7]]);
893 else
894 PRINT_PROC("%u (undefined)\n", nvram[7]);
895 PRINT_PROC("Date format : ");
896 PRINT_PROC(dateformat[nvram[8] & 7],
897 nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
898 PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12);
899 PRINT_PROC("Boot delay : ");
900 if (nvram[10] == 0)
901 PRINT_PROC("default");
902 else
903 PRINT_PROC("%ds%s\n", nvram[10],
904 nvram[10] < 8 ? ", no memory test" : "");
905
906 vmode = (nvram[14] << 8) || nvram[15];
907 PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n",
908 colors[vmode & 7],
909 vmode & 8 ? 80 : 40,
910 vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
911 PRINT_PROC(" %soverscan, compat. mode %s%s\n",
912 vmode & 64 ? "" : "no ",
913 vmode & 128 ? "on" : "off",
914 vmode & 256 ?
915 (vmode & 16 ? ", line doubling" : ", half screen") : "");
916
917 return 1;
918 }
919 #endif
920
921 #endif /* MACH == ATARI */
922
923 MODULE_LICENSE("GPL");
924
925 EXPORT_SYMBOL(__nvram_read_byte);
926 EXPORT_SYMBOL(nvram_read_byte);
927 EXPORT_SYMBOL(__nvram_write_byte);
928 EXPORT_SYMBOL(nvram_write_byte);
929 EXPORT_SYMBOL(__nvram_check_checksum);
930 EXPORT_SYMBOL(nvram_check_checksum);
931 EXPORT_SYMBOL(__nvram_set_checksum);
932 EXPORT_SYMBOL(nvram_set_checksum);
933