Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/drivers/char/nvram.c
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 6 months ago) by niro
File MIME type: text/plain
File size: 22352 byte(s)
Tag kernel26-2.6.12-alx-r9
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 dependent 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 DEFINE_SPINLOCK(nvram_state_lock); |
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 |
162 | __nvram_read_byte(int i) |
163 | { |
164 | return CMOS_READ(NVRAM_FIRST_BYTE + i); |
165 | } |
166 | |
167 | unsigned char |
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 |
181 | __nvram_write_byte(unsigned char c, int i) |
182 | { |
183 | CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); |
184 | } |
185 | |
186 | void |
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 |
197 | __nvram_check_checksum(void) |
198 | { |
199 | return mach_check_checksum(); |
200 | } |
201 | |
202 | int |
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 |
215 | __nvram_set_checksum(void) |
216 | { |
217 | mach_set_checksum(); |
218 | } |
219 | |
220 | 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 loff_t nvram_llseek(struct file *file,loff_t offset, int origin ) |
235 | { |
236 | lock_kernel(); |
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 | unlock_kernel(); |
249 | return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; |
250 | } |
251 | |
252 | static ssize_t |
253 | nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) |
254 | { |
255 | unsigned char contents[NVRAM_BYTES]; |
256 | unsigned i = *ppos; |
257 | unsigned char *tmp; |
258 | |
259 | spin_lock_irq(&rtc_lock); |
260 | |
261 | if (!__nvram_check_checksum()) |
262 | goto checksum_err; |
263 | |
264 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) |
265 | *tmp = __nvram_read_byte(i); |
266 | |
267 | spin_unlock_irq(&rtc_lock); |
268 | |
269 | if (copy_to_user(buf, contents, tmp - contents)) |
270 | return -EFAULT; |
271 | |
272 | *ppos = i; |
273 | |
274 | return tmp - contents; |
275 | |
276 | checksum_err: |
277 | spin_unlock_irq(&rtc_lock); |
278 | return -EIO; |
279 | } |
280 | |
281 | static ssize_t |
282 | nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) |
283 | { |
284 | unsigned char contents[NVRAM_BYTES]; |
285 | unsigned i = *ppos; |
286 | unsigned char *tmp; |
287 | int len; |
288 | |
289 | len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count; |
290 | if (copy_from_user(contents, buf, len)) |
291 | return -EFAULT; |
292 | |
293 | spin_lock_irq(&rtc_lock); |
294 | |
295 | if (!__nvram_check_checksum()) |
296 | goto checksum_err; |
297 | |
298 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) |
299 | __nvram_write_byte(*tmp, i); |
300 | |
301 | __nvram_set_checksum(); |
302 | |
303 | spin_unlock_irq(&rtc_lock); |
304 | |
305 | *ppos = i; |
306 | |
307 | return tmp - contents; |
308 | |
309 | checksum_err: |
310 | spin_unlock_irq(&rtc_lock); |
311 | return -EIO; |
312 | } |
313 | |
314 | static int |
315 | nvram_ioctl(struct inode *inode, struct file *file, |
316 | unsigned int cmd, unsigned long arg) |
317 | { |
318 | int i; |
319 | |
320 | switch (cmd) { |
321 | |
322 | case NVRAM_INIT: |
323 | /* initialize NVRAM contents and checksum */ |
324 | if (!capable(CAP_SYS_ADMIN)) |
325 | return -EACCES; |
326 | |
327 | spin_lock_irq(&rtc_lock); |
328 | |
329 | for (i = 0; i < NVRAM_BYTES; ++i) |
330 | __nvram_write_byte(0, i); |
331 | __nvram_set_checksum(); |
332 | |
333 | spin_unlock_irq(&rtc_lock); |
334 | return 0; |
335 | |
336 | case NVRAM_SETCKS: |
337 | /* just set checksum, contents unchanged (maybe useful after |
338 | * checksum garbaged somehow...) */ |
339 | if (!capable(CAP_SYS_ADMIN)) |
340 | return -EACCES; |
341 | |
342 | spin_lock_irq(&rtc_lock); |
343 | __nvram_set_checksum(); |
344 | spin_unlock_irq(&rtc_lock); |
345 | return 0; |
346 | |
347 | default: |
348 | return -ENOTTY; |
349 | } |
350 | } |
351 | |
352 | static int |
353 | nvram_open(struct inode *inode, struct file *file) |
354 | { |
355 | spin_lock(&nvram_state_lock); |
356 | |
357 | if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || |
358 | (nvram_open_mode & NVRAM_EXCL) || |
359 | ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) { |
360 | spin_unlock(&nvram_state_lock); |
361 | return -EBUSY; |
362 | } |
363 | |
364 | if (file->f_flags & O_EXCL) |
365 | nvram_open_mode |= NVRAM_EXCL; |
366 | if (file->f_mode & 2) |
367 | nvram_open_mode |= NVRAM_WRITE; |
368 | nvram_open_cnt++; |
369 | |
370 | spin_unlock(&nvram_state_lock); |
371 | |
372 | return 0; |
373 | } |
374 | |
375 | static int |
376 | nvram_release(struct inode *inode, struct file *file) |
377 | { |
378 | spin_lock(&nvram_state_lock); |
379 | |
380 | nvram_open_cnt--; |
381 | |
382 | /* if only one instance is open, clear the EXCL bit */ |
383 | if (nvram_open_mode & NVRAM_EXCL) |
384 | nvram_open_mode &= ~NVRAM_EXCL; |
385 | if (file->f_mode & 2) |
386 | nvram_open_mode &= ~NVRAM_WRITE; |
387 | |
388 | spin_unlock(&nvram_state_lock); |
389 | |
390 | return 0; |
391 | } |
392 | |
393 | #ifndef CONFIG_PROC_FS |
394 | static int |
395 | nvram_read_proc(char *buffer, char **start, off_t offset, |
396 | int size, int *eof, void *data) |
397 | { |
398 | return 0; |
399 | } |
400 | #else |
401 | |
402 | static int |
403 | nvram_read_proc(char *buffer, char **start, off_t offset, |
404 | int size, int *eof, void *data) |
405 | { |
406 | unsigned char contents[NVRAM_BYTES]; |
407 | int i, len = 0; |
408 | off_t begin = 0; |
409 | |
410 | spin_lock_irq(&rtc_lock); |
411 | for (i = 0; i < NVRAM_BYTES; ++i) |
412 | contents[i] = __nvram_read_byte(i); |
413 | spin_unlock_irq(&rtc_lock); |
414 | |
415 | *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size); |
416 | |
417 | if (offset >= begin + len) |
418 | return 0; |
419 | *start = buffer + (offset - begin); |
420 | return (size < begin + len - offset) ? size : begin + len - offset; |
421 | |
422 | } |
423 | |
424 | /* This macro frees the machine specific function from bounds checking and |
425 | * this like that... */ |
426 | #define PRINT_PROC(fmt,args...) \ |
427 | do { \ |
428 | *len += sprintf(buffer+*len, fmt, ##args); \ |
429 | if (*begin + *len > offset + size) \ |
430 | return 0; \ |
431 | if (*begin + *len < offset) { \ |
432 | *begin += *len; \ |
433 | *len = 0; \ |
434 | } \ |
435 | } while(0) |
436 | |
437 | #endif /* CONFIG_PROC_FS */ |
438 | |
439 | static struct file_operations nvram_fops = { |
440 | .owner = THIS_MODULE, |
441 | .llseek = nvram_llseek, |
442 | .read = nvram_read, |
443 | .write = nvram_write, |
444 | .ioctl = nvram_ioctl, |
445 | .open = nvram_open, |
446 | .release = nvram_release, |
447 | }; |
448 | |
449 | static struct miscdevice nvram_dev = { |
450 | NVRAM_MINOR, |
451 | "nvram", |
452 | &nvram_fops |
453 | }; |
454 | |
455 | static int __init |
456 | nvram_init(void) |
457 | { |
458 | int ret; |
459 | |
460 | /* First test whether the driver should init at all */ |
461 | if (!CHECK_DRIVER_INIT()) |
462 | return -ENXIO; |
463 | |
464 | ret = misc_register(&nvram_dev); |
465 | if (ret) { |
466 | printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", |
467 | NVRAM_MINOR); |
468 | goto out; |
469 | } |
470 | if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc, |
471 | NULL)) { |
472 | printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); |
473 | ret = -ENOMEM; |
474 | goto outmisc; |
475 | } |
476 | ret = 0; |
477 | printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); |
478 | out: |
479 | return ret; |
480 | outmisc: |
481 | misc_deregister(&nvram_dev); |
482 | goto out; |
483 | } |
484 | |
485 | static void __exit |
486 | nvram_cleanup_module(void) |
487 | { |
488 | remove_proc_entry("driver/nvram", NULL); |
489 | misc_deregister(&nvram_dev); |
490 | } |
491 | |
492 | module_init(nvram_init); |
493 | module_exit(nvram_cleanup_module); |
494 | |
495 | /* |
496 | * Machine specific functions |
497 | */ |
498 | |
499 | #if MACH == PC |
500 | |
501 | static int |
502 | pc_check_checksum(void) |
503 | { |
504 | int i; |
505 | unsigned short sum = 0; |
506 | unsigned short expect; |
507 | |
508 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) |
509 | sum += __nvram_read_byte(i); |
510 | expect = __nvram_read_byte(PC_CKS_LOC)<<8 | |
511 | __nvram_read_byte(PC_CKS_LOC+1); |
512 | return ((sum & 0xffff) == expect); |
513 | } |
514 | |
515 | static void |
516 | pc_set_checksum(void) |
517 | { |
518 | int i; |
519 | unsigned short sum = 0; |
520 | |
521 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) |
522 | sum += __nvram_read_byte(i); |
523 | __nvram_write_byte(sum >> 8, PC_CKS_LOC); |
524 | __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); |
525 | } |
526 | |
527 | #ifdef CONFIG_PROC_FS |
528 | |
529 | static char *floppy_types[] = { |
530 | "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", |
531 | "3.5'' 2.88M", "3.5'' 2.88M" |
532 | }; |
533 | |
534 | static char *gfx_types[] = { |
535 | "EGA, VGA, ... (with BIOS)", |
536 | "CGA (40 cols)", |
537 | "CGA (80 cols)", |
538 | "monochrome", |
539 | }; |
540 | |
541 | static int |
542 | pc_proc_infos(unsigned char *nvram, char *buffer, int *len, |
543 | off_t *begin, off_t offset, int size) |
544 | { |
545 | int checksum; |
546 | int type; |
547 | |
548 | spin_lock_irq(&rtc_lock); |
549 | checksum = __nvram_check_checksum(); |
550 | spin_unlock_irq(&rtc_lock); |
551 | |
552 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); |
553 | |
554 | PRINT_PROC("# floppies : %d\n", |
555 | (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); |
556 | PRINT_PROC("Floppy 0 type : "); |
557 | type = nvram[2] >> 4; |
558 | if (type < sizeof (floppy_types) / sizeof (*floppy_types)) |
559 | PRINT_PROC("%s\n", floppy_types[type]); |
560 | else |
561 | PRINT_PROC("%d (unknown)\n", type); |
562 | PRINT_PROC("Floppy 1 type : "); |
563 | type = nvram[2] & 0x0f; |
564 | if (type < sizeof (floppy_types) / sizeof (*floppy_types)) |
565 | PRINT_PROC("%s\n", floppy_types[type]); |
566 | else |
567 | PRINT_PROC("%d (unknown)\n", type); |
568 | |
569 | PRINT_PROC("HD 0 type : "); |
570 | type = nvram[4] >> 4; |
571 | if (type) |
572 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type); |
573 | else |
574 | PRINT_PROC("none\n"); |
575 | |
576 | PRINT_PROC("HD 1 type : "); |
577 | type = nvram[4] & 0x0f; |
578 | if (type) |
579 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type); |
580 | else |
581 | PRINT_PROC("none\n"); |
582 | |
583 | PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", |
584 | nvram[18] | (nvram[19] << 8), |
585 | nvram[20], nvram[25], |
586 | nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); |
587 | PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", |
588 | nvram[39] | (nvram[40] << 8), |
589 | nvram[41], nvram[46], |
590 | nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); |
591 | |
592 | PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); |
593 | PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n", |
594 | nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); |
595 | |
596 | PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]); |
597 | |
598 | PRINT_PROC("FPU : %sinstalled\n", |
599 | (nvram[6] & 2) ? "" : "not "); |
600 | |
601 | return 1; |
602 | } |
603 | #endif |
604 | |
605 | #endif /* MACH == PC */ |
606 | |
607 | #if MACH == COBALT |
608 | |
609 | /* the cobalt CMOS has a wider range of its checksum */ |
610 | static int cobalt_check_checksum(void) |
611 | { |
612 | int i; |
613 | unsigned short sum = 0; |
614 | unsigned short expect; |
615 | |
616 | for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { |
617 | if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) |
618 | continue; |
619 | |
620 | sum += __nvram_read_byte(i); |
621 | } |
622 | expect = __nvram_read_byte(COBT_CMOS_CHECKSUM) << 8 | |
623 | __nvram_read_byte(COBT_CMOS_CHECKSUM+1); |
624 | return ((sum & 0xffff) == expect); |
625 | } |
626 | |
627 | static void cobalt_set_checksum(void) |
628 | { |
629 | int i; |
630 | unsigned short sum = 0; |
631 | |
632 | for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) { |
633 | if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1))) |
634 | continue; |
635 | |
636 | sum += __nvram_read_byte(i); |
637 | } |
638 | |
639 | __nvram_write_byte(sum >> 8, COBT_CMOS_CHECKSUM); |
640 | __nvram_write_byte(sum & 0xff, COBT_CMOS_CHECKSUM+1); |
641 | } |
642 | |
643 | #ifdef CONFIG_PROC_FS |
644 | |
645 | static int cobalt_proc_infos(unsigned char *nvram, char *buffer, int *len, |
646 | off_t *begin, off_t offset, int size) |
647 | { |
648 | int i; |
649 | unsigned int checksum; |
650 | unsigned int flags; |
651 | char sernum[14]; |
652 | char *key = "cNoEbTaWlOtR!"; |
653 | unsigned char bto_csum; |
654 | |
655 | spin_lock_irq(&rtc_lock); |
656 | checksum = __nvram_check_checksum(); |
657 | spin_unlock_irq(&rtc_lock); |
658 | |
659 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); |
660 | |
661 | flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8 |
662 | | nvram[COBT_CMOS_FLAG_BYTE_1]; |
663 | |
664 | PRINT_PROC("Console: %s\n", |
665 | flags & COBT_CMOS_CONSOLE_FLAG ? "on": "off"); |
666 | |
667 | PRINT_PROC("Firmware Debug Messages: %s\n", |
668 | flags & COBT_CMOS_DEBUG_FLAG ? "on": "off"); |
669 | |
670 | PRINT_PROC("Auto Prompt: %s\n", |
671 | flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off"); |
672 | |
673 | PRINT_PROC("Shutdown Status: %s\n", |
674 | flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty"); |
675 | |
676 | PRINT_PROC("Hardware Probe: %s\n", |
677 | flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full"); |
678 | |
679 | PRINT_PROC("System Fault: %sdetected\n", |
680 | flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not "); |
681 | |
682 | PRINT_PROC("Panic on OOPS: %s\n", |
683 | flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no"); |
684 | |
685 | PRINT_PROC("Delayed Cache Initialization: %s\n", |
686 | flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no"); |
687 | |
688 | PRINT_PROC("Show Logo at Boot: %s\n", |
689 | flags & COBT_CMOS_NOLOGO_FLAG ? "no": "yes"); |
690 | |
691 | PRINT_PROC("Boot Method: "); |
692 | switch (nvram[COBT_CMOS_BOOT_METHOD]) { |
693 | case COBT_CMOS_BOOT_METHOD_DISK: |
694 | PRINT_PROC("disk\n"); |
695 | break; |
696 | |
697 | case COBT_CMOS_BOOT_METHOD_ROM: |
698 | PRINT_PROC("rom\n"); |
699 | break; |
700 | |
701 | case COBT_CMOS_BOOT_METHOD_NET: |
702 | PRINT_PROC("net\n"); |
703 | break; |
704 | |
705 | default: |
706 | PRINT_PROC("unknown\n"); |
707 | break; |
708 | } |
709 | |
710 | PRINT_PROC("Primary Boot Device: %d:%d\n", |
711 | nvram[COBT_CMOS_BOOT_DEV0_MAJ], |
712 | nvram[COBT_CMOS_BOOT_DEV0_MIN] ); |
713 | PRINT_PROC("Secondary Boot Device: %d:%d\n", |
714 | nvram[COBT_CMOS_BOOT_DEV1_MAJ], |
715 | nvram[COBT_CMOS_BOOT_DEV1_MIN] ); |
716 | PRINT_PROC("Tertiary Boot Device: %d:%d\n", |
717 | nvram[COBT_CMOS_BOOT_DEV2_MAJ], |
718 | nvram[COBT_CMOS_BOOT_DEV2_MIN] ); |
719 | |
720 | PRINT_PROC("Uptime: %d\n", |
721 | nvram[COBT_CMOS_UPTIME_0] << 24 | |
722 | nvram[COBT_CMOS_UPTIME_1] << 16 | |
723 | nvram[COBT_CMOS_UPTIME_2] << 8 | |
724 | nvram[COBT_CMOS_UPTIME_3]); |
725 | |
726 | PRINT_PROC("Boot Count: %d\n", |
727 | nvram[COBT_CMOS_BOOTCOUNT_0] << 24 | |
728 | nvram[COBT_CMOS_BOOTCOUNT_1] << 16 | |
729 | nvram[COBT_CMOS_BOOTCOUNT_2] << 8 | |
730 | nvram[COBT_CMOS_BOOTCOUNT_3]); |
731 | |
732 | /* 13 bytes of serial num */ |
733 | for (i=0 ; i<13 ; i++) { |
734 | sernum[i] = nvram[COBT_CMOS_SYS_SERNUM_0 + i]; |
735 | } |
736 | sernum[13] = '\0'; |
737 | |
738 | checksum = 0; |
739 | for (i=0 ; i<13 ; i++) { |
740 | checksum += sernum[i] ^ key[i]; |
741 | } |
742 | checksum = ((checksum & 0x7f) ^ (0xd6)) & 0xff; |
743 | |
744 | PRINT_PROC("Serial Number: %s", sernum); |
745 | if (checksum != nvram[COBT_CMOS_SYS_SERNUM_CSUM]) { |
746 | PRINT_PROC(" (invalid checksum)"); |
747 | } |
748 | PRINT_PROC("\n"); |
749 | |
750 | PRINT_PROC("Rom Revison: %d.%d.%d\n", nvram[COBT_CMOS_ROM_REV_MAJ], |
751 | nvram[COBT_CMOS_ROM_REV_MIN], nvram[COBT_CMOS_ROM_REV_REV]); |
752 | |
753 | PRINT_PROC("BTO Server: %d.%d.%d.%d", nvram[COBT_CMOS_BTO_IP_0], |
754 | nvram[COBT_CMOS_BTO_IP_1], nvram[COBT_CMOS_BTO_IP_2], |
755 | nvram[COBT_CMOS_BTO_IP_3]); |
756 | bto_csum = nvram[COBT_CMOS_BTO_IP_0] + nvram[COBT_CMOS_BTO_IP_1] |
757 | + nvram[COBT_CMOS_BTO_IP_2] + nvram[COBT_CMOS_BTO_IP_3]; |
758 | if (bto_csum != nvram[COBT_CMOS_BTO_IP_CSUM]) { |
759 | PRINT_PROC(" (invalid checksum)"); |
760 | } |
761 | PRINT_PROC("\n"); |
762 | |
763 | if (flags & COBT_CMOS_VERSION_FLAG |
764 | && nvram[COBT_CMOS_VERSION] >= COBT_CMOS_VER_BTOCODE) { |
765 | PRINT_PROC("BTO Code: 0x%x\n", |
766 | nvram[COBT_CMOS_BTO_CODE_0] << 24 | |
767 | nvram[COBT_CMOS_BTO_CODE_1] << 16 | |
768 | nvram[COBT_CMOS_BTO_CODE_2] << 8 | |
769 | nvram[COBT_CMOS_BTO_CODE_3]); |
770 | } |
771 | |
772 | return 1; |
773 | } |
774 | #endif /* CONFIG_PROC_FS */ |
775 | |
776 | #endif /* MACH == COBALT */ |
777 | |
778 | #if MACH == ATARI |
779 | |
780 | static int |
781 | atari_check_checksum(void) |
782 | { |
783 | int i; |
784 | unsigned char sum = 0; |
785 | |
786 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) |
787 | sum += __nvram_read_byte(i); |
788 | return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) && |
789 | __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); |
790 | } |
791 | |
792 | static void |
793 | atari_set_checksum(void) |
794 | { |
795 | int i; |
796 | unsigned char sum = 0; |
797 | |
798 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) |
799 | sum += __nvram_read_byte(i); |
800 | __nvram_write_byte(~sum, ATARI_CKS_LOC); |
801 | __nvram_write_byte(sum, ATARI_CKS_LOC + 1); |
802 | } |
803 | |
804 | #ifdef CONFIG_PROC_FS |
805 | |
806 | static struct { |
807 | unsigned char val; |
808 | char *name; |
809 | } boot_prefs[] = { |
810 | { 0x80, "TOS" }, |
811 | { 0x40, "ASV" }, |
812 | { 0x20, "NetBSD (?)" }, |
813 | { 0x10, "Linux" }, |
814 | { 0x00, "unspecified" } |
815 | }; |
816 | |
817 | static char *languages[] = { |
818 | "English (US)", |
819 | "German", |
820 | "French", |
821 | "English (UK)", |
822 | "Spanish", |
823 | "Italian", |
824 | "6 (undefined)", |
825 | "Swiss (French)", |
826 | "Swiss (German)" |
827 | }; |
828 | |
829 | static char *dateformat[] = { |
830 | "MM%cDD%cYY", |
831 | "DD%cMM%cYY", |
832 | "YY%cMM%cDD", |
833 | "YY%cDD%cMM", |
834 | "4 (undefined)", |
835 | "5 (undefined)", |
836 | "6 (undefined)", |
837 | "7 (undefined)" |
838 | }; |
839 | |
840 | static char *colors[] = { |
841 | "2", "4", "16", "256", "65536", "??", "??", "??" |
842 | }; |
843 | |
844 | #define fieldsize(a) (sizeof(a)/sizeof(*a)) |
845 | |
846 | static int |
847 | atari_proc_infos(unsigned char *nvram, char *buffer, int *len, |
848 | off_t *begin, off_t offset, int size) |
849 | { |
850 | int checksum = nvram_check_checksum(); |
851 | int i; |
852 | unsigned vmode; |
853 | |
854 | PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not "); |
855 | |
856 | PRINT_PROC("Boot preference : "); |
857 | for (i = fieldsize(boot_prefs) - 1; i >= 0; --i) { |
858 | if (nvram[1] == boot_prefs[i].val) { |
859 | PRINT_PROC("%s\n", boot_prefs[i].name); |
860 | break; |
861 | } |
862 | } |
863 | if (i < 0) |
864 | PRINT_PROC("0x%02x (undefined)\n", nvram[1]); |
865 | |
866 | PRINT_PROC("SCSI arbitration : %s\n", |
867 | (nvram[16] & 0x80) ? "on" : "off"); |
868 | PRINT_PROC("SCSI host ID : "); |
869 | if (nvram[16] & 0x80) |
870 | PRINT_PROC("%d\n", nvram[16] & 7); |
871 | else |
872 | PRINT_PROC("n/a\n"); |
873 | |
874 | /* the following entries are defined only for the Falcon */ |
875 | if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) |
876 | return 1; |
877 | |
878 | PRINT_PROC("OS language : "); |
879 | if (nvram[6] < fieldsize(languages)) |
880 | PRINT_PROC("%s\n", languages[nvram[6]]); |
881 | else |
882 | PRINT_PROC("%u (undefined)\n", nvram[6]); |
883 | PRINT_PROC("Keyboard language: "); |
884 | if (nvram[7] < fieldsize(languages)) |
885 | PRINT_PROC("%s\n", languages[nvram[7]]); |
886 | else |
887 | PRINT_PROC("%u (undefined)\n", nvram[7]); |
888 | PRINT_PROC("Date format : "); |
889 | PRINT_PROC(dateformat[nvram[8] & 7], |
890 | nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); |
891 | PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12); |
892 | PRINT_PROC("Boot delay : "); |
893 | if (nvram[10] == 0) |
894 | PRINT_PROC("default"); |
895 | else |
896 | PRINT_PROC("%ds%s\n", nvram[10], |
897 | nvram[10] < 8 ? ", no memory test" : ""); |
898 | |
899 | vmode = (nvram[14] << 8) || nvram[15]; |
900 | PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n", |
901 | colors[vmode & 7], |
902 | vmode & 8 ? 80 : 40, |
903 | vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); |
904 | PRINT_PROC(" %soverscan, compat. mode %s%s\n", |
905 | vmode & 64 ? "" : "no ", |
906 | vmode & 128 ? "on" : "off", |
907 | vmode & 256 ? |
908 | (vmode & 16 ? ", line doubling" : ", half screen") : ""); |
909 | |
910 | return 1; |
911 | } |
912 | #endif |
913 | |
914 | #endif /* MACH == ATARI */ |
915 | |
916 | MODULE_LICENSE("GPL"); |
917 | |
918 | EXPORT_SYMBOL(__nvram_read_byte); |
919 | EXPORT_SYMBOL(nvram_read_byte); |
920 | EXPORT_SYMBOL(__nvram_write_byte); |
921 | EXPORT_SYMBOL(nvram_write_byte); |
922 | EXPORT_SYMBOL(__nvram_check_checksum); |
923 | EXPORT_SYMBOL(nvram_check_checksum); |
924 | EXPORT_SYMBOL(__nvram_set_checksum); |
925 | EXPORT_SYMBOL(nvram_set_checksum); |
926 | MODULE_ALIAS_MISCDEV(NVRAM_MINOR); |