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1da177e4 LT |
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 | ||
866237ea | 37 | #define NVRAM_VERSION "1.2" |
1da177e4 LT |
38 | |
39 | #include <linux/module.h> | |
1da177e4 LT |
40 | #include <linux/smp_lock.h> |
41 | #include <linux/nvram.h> | |
42 | ||
43 | #define PC 1 | |
44 | #define ATARI 2 | |
1da177e4 LT |
45 | |
46 | /* select machine configuration */ | |
47 | #if defined(CONFIG_ATARI) | |
48 | # define MACH ATARI | |
49 | #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */ | |
ea5a3dcf | 50 | # define MACH PC |
1da177e4 LT |
51 | #else |
52 | # error Cannot build nvram driver for this machine configuration. | |
53 | #endif | |
54 | ||
55 | #if MACH == PC | |
56 | ||
57 | /* RTC in a PC */ | |
58 | #define CHECK_DRIVER_INIT() 1 | |
59 | ||
60 | /* On PCs, the checksum is built only over bytes 2..31 */ | |
61 | #define PC_CKS_RANGE_START 2 | |
62 | #define PC_CKS_RANGE_END 31 | |
63 | #define PC_CKS_LOC 32 | |
64 | #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE) | |
65 | ||
66 | #define mach_check_checksum pc_check_checksum | |
67 | #define mach_set_checksum pc_set_checksum | |
68 | #define mach_proc_infos pc_proc_infos | |
69 | ||
70 | #endif | |
71 | ||
1da177e4 LT |
72 | #if MACH == ATARI |
73 | ||
74 | /* Special parameters for RTC in Atari machines */ | |
75 | #include <asm/atarihw.h> | |
76 | #include <asm/atariints.h> | |
77 | #define RTC_PORT(x) (TT_RTC_BAS + 2*(x)) | |
78 | #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK)) | |
79 | ||
80 | #define NVRAM_BYTES 50 | |
81 | ||
82 | /* On Ataris, the checksum is over all bytes except the checksum bytes | |
83 | * themselves; these are at the very end */ | |
84 | #define ATARI_CKS_RANGE_START 0 | |
85 | #define ATARI_CKS_RANGE_END 47 | |
86 | #define ATARI_CKS_LOC 48 | |
87 | ||
88 | #define mach_check_checksum atari_check_checksum | |
89 | #define mach_set_checksum atari_set_checksum | |
90 | #define mach_proc_infos atari_proc_infos | |
91 | ||
92 | #endif | |
93 | ||
94 | /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with | |
95 | * rtc_lock held. Due to the index-port/data-port design of the RTC, we | |
96 | * don't want two different things trying to get to it at once. (e.g. the | |
97 | * periodic 11 min sync from time.c vs. this driver.) | |
98 | */ | |
99 | ||
100 | #include <linux/types.h> | |
101 | #include <linux/errno.h> | |
102 | #include <linux/miscdevice.h> | |
103 | #include <linux/slab.h> | |
104 | #include <linux/ioport.h> | |
105 | #include <linux/fcntl.h> | |
106 | #include <linux/mc146818rtc.h> | |
107 | #include <linux/init.h> | |
108 | #include <linux/proc_fs.h> | |
109 | #include <linux/spinlock.h> | |
110 | ||
111 | #include <asm/io.h> | |
112 | #include <asm/uaccess.h> | |
113 | #include <asm/system.h> | |
114 | ||
115 | static DEFINE_SPINLOCK(nvram_state_lock); | |
116 | static int nvram_open_cnt; /* #times opened */ | |
117 | static int nvram_open_mode; /* special open modes */ | |
118 | #define NVRAM_WRITE 1 /* opened for writing (exclusive) */ | |
119 | #define NVRAM_EXCL 2 /* opened with O_EXCL */ | |
120 | ||
121 | static int mach_check_checksum(void); | |
122 | static void mach_set_checksum(void); | |
123 | ||
124 | #ifdef CONFIG_PROC_FS | |
125 | static int mach_proc_infos(unsigned char *contents, char *buffer, int *len, | |
126 | off_t *begin, off_t offset, int size); | |
127 | #endif | |
128 | ||
129 | /* | |
130 | * These functions are provided to be called internally or by other parts of | |
131 | * the kernel. It's up to the caller to ensure correct checksum before reading | |
132 | * or after writing (needs to be done only once). | |
133 | * | |
134 | * It is worth noting that these functions all access bytes of general | |
135 | * purpose memory in the NVRAM - that is to say, they all add the | |
136 | * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not | |
137 | * know about the RTC cruft. | |
138 | */ | |
139 | ||
140 | unsigned char | |
141 | __nvram_read_byte(int i) | |
142 | { | |
143 | return CMOS_READ(NVRAM_FIRST_BYTE + i); | |
144 | } | |
145 | ||
146 | unsigned char | |
147 | nvram_read_byte(int i) | |
148 | { | |
149 | unsigned long flags; | |
150 | unsigned char c; | |
151 | ||
152 | spin_lock_irqsave(&rtc_lock, flags); | |
153 | c = __nvram_read_byte(i); | |
154 | spin_unlock_irqrestore(&rtc_lock, flags); | |
155 | return c; | |
156 | } | |
157 | ||
158 | /* This races nicely with trying to read with checksum checking (nvram_read) */ | |
159 | void | |
160 | __nvram_write_byte(unsigned char c, int i) | |
161 | { | |
162 | CMOS_WRITE(c, NVRAM_FIRST_BYTE + i); | |
163 | } | |
164 | ||
165 | void | |
166 | nvram_write_byte(unsigned char c, int i) | |
167 | { | |
168 | unsigned long flags; | |
169 | ||
170 | spin_lock_irqsave(&rtc_lock, flags); | |
171 | __nvram_write_byte(c, i); | |
172 | spin_unlock_irqrestore(&rtc_lock, flags); | |
173 | } | |
174 | ||
175 | int | |
176 | __nvram_check_checksum(void) | |
177 | { | |
178 | return mach_check_checksum(); | |
179 | } | |
180 | ||
181 | int | |
182 | nvram_check_checksum(void) | |
183 | { | |
184 | unsigned long flags; | |
185 | int rv; | |
186 | ||
187 | spin_lock_irqsave(&rtc_lock, flags); | |
188 | rv = __nvram_check_checksum(); | |
189 | spin_unlock_irqrestore(&rtc_lock, flags); | |
190 | return rv; | |
191 | } | |
192 | ||
681ea4b9 | 193 | static void |
1da177e4 LT |
194 | __nvram_set_checksum(void) |
195 | { | |
196 | mach_set_checksum(); | |
197 | } | |
198 | ||
681ea4b9 | 199 | #if 0 |
1da177e4 LT |
200 | void |
201 | nvram_set_checksum(void) | |
202 | { | |
203 | unsigned long flags; | |
204 | ||
205 | spin_lock_irqsave(&rtc_lock, flags); | |
206 | __nvram_set_checksum(); | |
207 | spin_unlock_irqrestore(&rtc_lock, flags); | |
208 | } | |
681ea4b9 | 209 | #endif /* 0 */ |
1da177e4 LT |
210 | |
211 | /* | |
212 | * The are the file operation function for user access to /dev/nvram | |
213 | */ | |
214 | ||
215 | static loff_t nvram_llseek(struct file *file,loff_t offset, int origin ) | |
216 | { | |
217 | lock_kernel(); | |
218 | switch (origin) { | |
219 | case 0: | |
220 | /* nothing to do */ | |
221 | break; | |
222 | case 1: | |
223 | offset += file->f_pos; | |
224 | break; | |
225 | case 2: | |
226 | offset += NVRAM_BYTES; | |
227 | break; | |
228 | } | |
229 | unlock_kernel(); | |
230 | return (offset >= 0) ? (file->f_pos = offset) : -EINVAL; | |
231 | } | |
232 | ||
233 | static ssize_t | |
234 | nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos) | |
235 | { | |
236 | unsigned char contents[NVRAM_BYTES]; | |
237 | unsigned i = *ppos; | |
238 | unsigned char *tmp; | |
239 | ||
240 | spin_lock_irq(&rtc_lock); | |
241 | ||
242 | if (!__nvram_check_checksum()) | |
243 | goto checksum_err; | |
244 | ||
245 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
246 | *tmp = __nvram_read_byte(i); | |
247 | ||
248 | spin_unlock_irq(&rtc_lock); | |
249 | ||
250 | if (copy_to_user(buf, contents, tmp - contents)) | |
251 | return -EFAULT; | |
252 | ||
253 | *ppos = i; | |
254 | ||
255 | return tmp - contents; | |
256 | ||
257 | checksum_err: | |
258 | spin_unlock_irq(&rtc_lock); | |
259 | return -EIO; | |
260 | } | |
261 | ||
262 | static ssize_t | |
263 | nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos) | |
264 | { | |
265 | unsigned char contents[NVRAM_BYTES]; | |
266 | unsigned i = *ppos; | |
267 | unsigned char *tmp; | |
268 | int len; | |
269 | ||
270 | len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count; | |
271 | if (copy_from_user(contents, buf, len)) | |
272 | return -EFAULT; | |
273 | ||
274 | spin_lock_irq(&rtc_lock); | |
275 | ||
276 | if (!__nvram_check_checksum()) | |
277 | goto checksum_err; | |
278 | ||
279 | for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp) | |
280 | __nvram_write_byte(*tmp, i); | |
281 | ||
282 | __nvram_set_checksum(); | |
283 | ||
284 | spin_unlock_irq(&rtc_lock); | |
285 | ||
286 | *ppos = i; | |
287 | ||
288 | return tmp - contents; | |
289 | ||
290 | checksum_err: | |
291 | spin_unlock_irq(&rtc_lock); | |
292 | return -EIO; | |
293 | } | |
294 | ||
295 | static int | |
296 | nvram_ioctl(struct inode *inode, struct file *file, | |
297 | unsigned int cmd, unsigned long arg) | |
298 | { | |
299 | int i; | |
300 | ||
301 | switch (cmd) { | |
302 | ||
303 | case NVRAM_INIT: | |
304 | /* initialize NVRAM contents and checksum */ | |
305 | if (!capable(CAP_SYS_ADMIN)) | |
306 | return -EACCES; | |
307 | ||
308 | spin_lock_irq(&rtc_lock); | |
309 | ||
310 | for (i = 0; i < NVRAM_BYTES; ++i) | |
311 | __nvram_write_byte(0, i); | |
312 | __nvram_set_checksum(); | |
313 | ||
314 | spin_unlock_irq(&rtc_lock); | |
315 | return 0; | |
316 | ||
317 | case NVRAM_SETCKS: | |
318 | /* just set checksum, contents unchanged (maybe useful after | |
319 | * checksum garbaged somehow...) */ | |
320 | if (!capable(CAP_SYS_ADMIN)) | |
321 | return -EACCES; | |
322 | ||
323 | spin_lock_irq(&rtc_lock); | |
324 | __nvram_set_checksum(); | |
325 | spin_unlock_irq(&rtc_lock); | |
326 | return 0; | |
327 | ||
328 | default: | |
329 | return -ENOTTY; | |
330 | } | |
331 | } | |
332 | ||
333 | static int | |
334 | nvram_open(struct inode *inode, struct file *file) | |
335 | { | |
336 | spin_lock(&nvram_state_lock); | |
337 | ||
338 | if ((nvram_open_cnt && (file->f_flags & O_EXCL)) || | |
339 | (nvram_open_mode & NVRAM_EXCL) || | |
340 | ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) { | |
341 | spin_unlock(&nvram_state_lock); | |
342 | return -EBUSY; | |
343 | } | |
344 | ||
345 | if (file->f_flags & O_EXCL) | |
346 | nvram_open_mode |= NVRAM_EXCL; | |
347 | if (file->f_mode & 2) | |
348 | nvram_open_mode |= NVRAM_WRITE; | |
349 | nvram_open_cnt++; | |
350 | ||
351 | spin_unlock(&nvram_state_lock); | |
352 | ||
353 | return 0; | |
354 | } | |
355 | ||
356 | static int | |
357 | nvram_release(struct inode *inode, struct file *file) | |
358 | { | |
359 | spin_lock(&nvram_state_lock); | |
360 | ||
361 | nvram_open_cnt--; | |
362 | ||
363 | /* if only one instance is open, clear the EXCL bit */ | |
364 | if (nvram_open_mode & NVRAM_EXCL) | |
365 | nvram_open_mode &= ~NVRAM_EXCL; | |
366 | if (file->f_mode & 2) | |
367 | nvram_open_mode &= ~NVRAM_WRITE; | |
368 | ||
369 | spin_unlock(&nvram_state_lock); | |
370 | ||
371 | return 0; | |
372 | } | |
373 | ||
374 | #ifndef CONFIG_PROC_FS | |
375 | static int | |
376 | nvram_read_proc(char *buffer, char **start, off_t offset, | |
377 | int size, int *eof, void *data) | |
378 | { | |
379 | return 0; | |
380 | } | |
381 | #else | |
382 | ||
383 | static int | |
384 | nvram_read_proc(char *buffer, char **start, off_t offset, | |
385 | int size, int *eof, void *data) | |
386 | { | |
387 | unsigned char contents[NVRAM_BYTES]; | |
388 | int i, len = 0; | |
389 | off_t begin = 0; | |
390 | ||
391 | spin_lock_irq(&rtc_lock); | |
392 | for (i = 0; i < NVRAM_BYTES; ++i) | |
393 | contents[i] = __nvram_read_byte(i); | |
394 | spin_unlock_irq(&rtc_lock); | |
395 | ||
396 | *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size); | |
397 | ||
398 | if (offset >= begin + len) | |
399 | return 0; | |
400 | *start = buffer + (offset - begin); | |
401 | return (size < begin + len - offset) ? size : begin + len - offset; | |
402 | ||
403 | } | |
404 | ||
405 | /* This macro frees the machine specific function from bounds checking and | |
406 | * this like that... */ | |
407 | #define PRINT_PROC(fmt,args...) \ | |
408 | do { \ | |
409 | *len += sprintf(buffer+*len, fmt, ##args); \ | |
410 | if (*begin + *len > offset + size) \ | |
411 | return 0; \ | |
412 | if (*begin + *len < offset) { \ | |
413 | *begin += *len; \ | |
414 | *len = 0; \ | |
415 | } \ | |
416 | } while(0) | |
417 | ||
418 | #endif /* CONFIG_PROC_FS */ | |
419 | ||
62322d25 | 420 | static const struct file_operations nvram_fops = { |
1da177e4 LT |
421 | .owner = THIS_MODULE, |
422 | .llseek = nvram_llseek, | |
423 | .read = nvram_read, | |
424 | .write = nvram_write, | |
425 | .ioctl = nvram_ioctl, | |
426 | .open = nvram_open, | |
427 | .release = nvram_release, | |
428 | }; | |
429 | ||
430 | static struct miscdevice nvram_dev = { | |
431 | NVRAM_MINOR, | |
432 | "nvram", | |
433 | &nvram_fops | |
434 | }; | |
435 | ||
436 | static int __init | |
437 | nvram_init(void) | |
438 | { | |
439 | int ret; | |
440 | ||
441 | /* First test whether the driver should init at all */ | |
442 | if (!CHECK_DRIVER_INIT()) | |
443 | return -ENXIO; | |
444 | ||
445 | ret = misc_register(&nvram_dev); | |
446 | if (ret) { | |
447 | printk(KERN_ERR "nvram: can't misc_register on minor=%d\n", | |
448 | NVRAM_MINOR); | |
449 | goto out; | |
450 | } | |
451 | if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc, | |
452 | NULL)) { | |
453 | printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n"); | |
454 | ret = -ENOMEM; | |
455 | goto outmisc; | |
456 | } | |
457 | ret = 0; | |
458 | printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n"); | |
459 | out: | |
460 | return ret; | |
461 | outmisc: | |
462 | misc_deregister(&nvram_dev); | |
463 | goto out; | |
464 | } | |
465 | ||
466 | static void __exit | |
467 | nvram_cleanup_module(void) | |
468 | { | |
469 | remove_proc_entry("driver/nvram", NULL); | |
470 | misc_deregister(&nvram_dev); | |
471 | } | |
472 | ||
473 | module_init(nvram_init); | |
474 | module_exit(nvram_cleanup_module); | |
475 | ||
476 | /* | |
477 | * Machine specific functions | |
478 | */ | |
479 | ||
480 | #if MACH == PC | |
481 | ||
482 | static int | |
483 | pc_check_checksum(void) | |
484 | { | |
485 | int i; | |
486 | unsigned short sum = 0; | |
487 | unsigned short expect; | |
488 | ||
489 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
490 | sum += __nvram_read_byte(i); | |
491 | expect = __nvram_read_byte(PC_CKS_LOC)<<8 | | |
492 | __nvram_read_byte(PC_CKS_LOC+1); | |
493 | return ((sum & 0xffff) == expect); | |
494 | } | |
495 | ||
496 | static void | |
497 | pc_set_checksum(void) | |
498 | { | |
499 | int i; | |
500 | unsigned short sum = 0; | |
501 | ||
502 | for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i) | |
503 | sum += __nvram_read_byte(i); | |
504 | __nvram_write_byte(sum >> 8, PC_CKS_LOC); | |
505 | __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1); | |
506 | } | |
507 | ||
508 | #ifdef CONFIG_PROC_FS | |
509 | ||
510 | static char *floppy_types[] = { | |
511 | "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M", | |
512 | "3.5'' 2.88M", "3.5'' 2.88M" | |
513 | }; | |
514 | ||
515 | static char *gfx_types[] = { | |
516 | "EGA, VGA, ... (with BIOS)", | |
517 | "CGA (40 cols)", | |
518 | "CGA (80 cols)", | |
519 | "monochrome", | |
520 | }; | |
521 | ||
522 | static int | |
523 | pc_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
524 | off_t *begin, off_t offset, int size) | |
525 | { | |
526 | int checksum; | |
527 | int type; | |
528 | ||
529 | spin_lock_irq(&rtc_lock); | |
530 | checksum = __nvram_check_checksum(); | |
531 | spin_unlock_irq(&rtc_lock); | |
532 | ||
533 | PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not "); | |
534 | ||
535 | PRINT_PROC("# floppies : %d\n", | |
536 | (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0); | |
537 | PRINT_PROC("Floppy 0 type : "); | |
538 | type = nvram[2] >> 4; | |
fe971071 | 539 | if (type < ARRAY_SIZE(floppy_types)) |
1da177e4 LT |
540 | PRINT_PROC("%s\n", floppy_types[type]); |
541 | else | |
542 | PRINT_PROC("%d (unknown)\n", type); | |
543 | PRINT_PROC("Floppy 1 type : "); | |
544 | type = nvram[2] & 0x0f; | |
fe971071 | 545 | if (type < ARRAY_SIZE(floppy_types)) |
1da177e4 LT |
546 | PRINT_PROC("%s\n", floppy_types[type]); |
547 | else | |
548 | PRINT_PROC("%d (unknown)\n", type); | |
549 | ||
550 | PRINT_PROC("HD 0 type : "); | |
551 | type = nvram[4] >> 4; | |
552 | if (type) | |
553 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type); | |
554 | else | |
555 | PRINT_PROC("none\n"); | |
556 | ||
557 | PRINT_PROC("HD 1 type : "); | |
558 | type = nvram[4] & 0x0f; | |
559 | if (type) | |
560 | PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type); | |
561 | else | |
562 | PRINT_PROC("none\n"); | |
563 | ||
564 | PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", | |
565 | nvram[18] | (nvram[19] << 8), | |
566 | nvram[20], nvram[25], | |
567 | nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8)); | |
568 | PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n", | |
569 | nvram[39] | (nvram[40] << 8), | |
570 | nvram[41], nvram[46], | |
571 | nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8)); | |
572 | ||
573 | PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8)); | |
574 | PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n", | |
575 | nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8)); | |
576 | ||
577 | PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]); | |
578 | ||
579 | PRINT_PROC("FPU : %sinstalled\n", | |
580 | (nvram[6] & 2) ? "" : "not "); | |
581 | ||
582 | return 1; | |
583 | } | |
584 | #endif | |
585 | ||
586 | #endif /* MACH == PC */ | |
587 | ||
1da177e4 LT |
588 | #if MACH == ATARI |
589 | ||
590 | static int | |
591 | atari_check_checksum(void) | |
592 | { | |
593 | int i; | |
594 | unsigned char sum = 0; | |
595 | ||
596 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
597 | sum += __nvram_read_byte(i); | |
598 | return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) && | |
599 | __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff)); | |
600 | } | |
601 | ||
602 | static void | |
603 | atari_set_checksum(void) | |
604 | { | |
605 | int i; | |
606 | unsigned char sum = 0; | |
607 | ||
608 | for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i) | |
609 | sum += __nvram_read_byte(i); | |
610 | __nvram_write_byte(~sum, ATARI_CKS_LOC); | |
611 | __nvram_write_byte(sum, ATARI_CKS_LOC + 1); | |
612 | } | |
613 | ||
614 | #ifdef CONFIG_PROC_FS | |
615 | ||
616 | static struct { | |
617 | unsigned char val; | |
618 | char *name; | |
619 | } boot_prefs[] = { | |
620 | { 0x80, "TOS" }, | |
621 | { 0x40, "ASV" }, | |
622 | { 0x20, "NetBSD (?)" }, | |
623 | { 0x10, "Linux" }, | |
624 | { 0x00, "unspecified" } | |
625 | }; | |
626 | ||
627 | static char *languages[] = { | |
628 | "English (US)", | |
629 | "German", | |
630 | "French", | |
631 | "English (UK)", | |
632 | "Spanish", | |
633 | "Italian", | |
634 | "6 (undefined)", | |
635 | "Swiss (French)", | |
636 | "Swiss (German)" | |
637 | }; | |
638 | ||
639 | static char *dateformat[] = { | |
640 | "MM%cDD%cYY", | |
641 | "DD%cMM%cYY", | |
642 | "YY%cMM%cDD", | |
643 | "YY%cDD%cMM", | |
644 | "4 (undefined)", | |
645 | "5 (undefined)", | |
646 | "6 (undefined)", | |
647 | "7 (undefined)" | |
648 | }; | |
649 | ||
650 | static char *colors[] = { | |
651 | "2", "4", "16", "256", "65536", "??", "??", "??" | |
652 | }; | |
653 | ||
1da177e4 LT |
654 | static int |
655 | atari_proc_infos(unsigned char *nvram, char *buffer, int *len, | |
656 | off_t *begin, off_t offset, int size) | |
657 | { | |
658 | int checksum = nvram_check_checksum(); | |
659 | int i; | |
660 | unsigned vmode; | |
661 | ||
662 | PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not "); | |
663 | ||
664 | PRINT_PROC("Boot preference : "); | |
fe971071 | 665 | for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) { |
1da177e4 LT |
666 | if (nvram[1] == boot_prefs[i].val) { |
667 | PRINT_PROC("%s\n", boot_prefs[i].name); | |
668 | break; | |
669 | } | |
670 | } | |
671 | if (i < 0) | |
672 | PRINT_PROC("0x%02x (undefined)\n", nvram[1]); | |
673 | ||
674 | PRINT_PROC("SCSI arbitration : %s\n", | |
675 | (nvram[16] & 0x80) ? "on" : "off"); | |
676 | PRINT_PROC("SCSI host ID : "); | |
677 | if (nvram[16] & 0x80) | |
678 | PRINT_PROC("%d\n", nvram[16] & 7); | |
679 | else | |
680 | PRINT_PROC("n/a\n"); | |
681 | ||
682 | /* the following entries are defined only for the Falcon */ | |
683 | if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON) | |
684 | return 1; | |
685 | ||
686 | PRINT_PROC("OS language : "); | |
fe971071 | 687 | if (nvram[6] < ARRAY_SIZE(languages)) |
1da177e4 LT |
688 | PRINT_PROC("%s\n", languages[nvram[6]]); |
689 | else | |
690 | PRINT_PROC("%u (undefined)\n", nvram[6]); | |
691 | PRINT_PROC("Keyboard language: "); | |
fe971071 | 692 | if (nvram[7] < ARRAY_SIZE(languages)) |
1da177e4 LT |
693 | PRINT_PROC("%s\n", languages[nvram[7]]); |
694 | else | |
695 | PRINT_PROC("%u (undefined)\n", nvram[7]); | |
696 | PRINT_PROC("Date format : "); | |
697 | PRINT_PROC(dateformat[nvram[8] & 7], | |
698 | nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/'); | |
699 | PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12); | |
700 | PRINT_PROC("Boot delay : "); | |
701 | if (nvram[10] == 0) | |
702 | PRINT_PROC("default"); | |
703 | else | |
704 | PRINT_PROC("%ds%s\n", nvram[10], | |
705 | nvram[10] < 8 ? ", no memory test" : ""); | |
706 | ||
707 | vmode = (nvram[14] << 8) || nvram[15]; | |
708 | PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n", | |
709 | colors[vmode & 7], | |
710 | vmode & 8 ? 80 : 40, | |
711 | vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC"); | |
712 | PRINT_PROC(" %soverscan, compat. mode %s%s\n", | |
713 | vmode & 64 ? "" : "no ", | |
714 | vmode & 128 ? "on" : "off", | |
715 | vmode & 256 ? | |
716 | (vmode & 16 ? ", line doubling" : ", half screen") : ""); | |
717 | ||
718 | return 1; | |
719 | } | |
720 | #endif | |
721 | ||
722 | #endif /* MACH == ATARI */ | |
723 | ||
724 | MODULE_LICENSE("GPL"); | |
725 | ||
726 | EXPORT_SYMBOL(__nvram_read_byte); | |
727 | EXPORT_SYMBOL(nvram_read_byte); | |
728 | EXPORT_SYMBOL(__nvram_write_byte); | |
729 | EXPORT_SYMBOL(nvram_write_byte); | |
730 | EXPORT_SYMBOL(__nvram_check_checksum); | |
731 | EXPORT_SYMBOL(nvram_check_checksum); | |
1da177e4 | 732 | MODULE_ALIAS_MISCDEV(NVRAM_MINOR); |