ia64/linux-2.6.18-xen.hg

view drivers/char/nvram.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
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 */
37 #define NVRAM_VERSION "1.2"
39 #include <linux/module.h>
40 #include <linux/sched.h>
41 #include <linux/smp_lock.h>
42 #include <linux/nvram.h>
44 #define PC 1
45 #define ATARI 2
46 #define COBALT 3
48 /* select machine configuration */
49 #if defined(CONFIG_ATARI)
50 # define MACH ATARI
51 #elif defined(__i386__) || defined(__x86_64__) || defined(__arm__) /* and others?? */
52 #define MACH PC
53 # if defined(CONFIG_COBALT)
54 # include <linux/cobalt-nvram.h>
55 # define MACH COBALT
56 # else
57 # define MACH PC
58 # endif
59 #else
60 # error Cannot build nvram driver for this machine configuration.
61 #endif
63 #if MACH == PC
65 /* RTC in a PC */
66 #define CHECK_DRIVER_INIT() 1
68 /* On PCs, the checksum is built only over bytes 2..31 */
69 #define PC_CKS_RANGE_START 2
70 #define PC_CKS_RANGE_END 31
71 #define PC_CKS_LOC 32
72 #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
74 #define mach_check_checksum pc_check_checksum
75 #define mach_set_checksum pc_set_checksum
76 #define mach_proc_infos pc_proc_infos
78 #endif
80 #if MACH == COBALT
82 #define CHECK_DRIVER_INIT() 1
84 #define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
86 #define mach_check_checksum cobalt_check_checksum
87 #define mach_set_checksum cobalt_set_checksum
88 #define mach_proc_infos cobalt_proc_infos
90 #endif
92 #if MACH == ATARI
94 /* Special parameters for RTC in Atari machines */
95 #include <asm/atarihw.h>
96 #include <asm/atariints.h>
97 #define RTC_PORT(x) (TT_RTC_BAS + 2*(x))
98 #define CHECK_DRIVER_INIT() (MACH_IS_ATARI && ATARIHW_PRESENT(TT_CLK))
100 #define NVRAM_BYTES 50
102 /* On Ataris, the checksum is over all bytes except the checksum bytes
103 * themselves; these are at the very end */
104 #define ATARI_CKS_RANGE_START 0
105 #define ATARI_CKS_RANGE_END 47
106 #define ATARI_CKS_LOC 48
108 #define mach_check_checksum atari_check_checksum
109 #define mach_set_checksum atari_set_checksum
110 #define mach_proc_infos atari_proc_infos
112 #endif
114 /* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
115 * rtc_lock held. Due to the index-port/data-port design of the RTC, we
116 * don't want two different things trying to get to it at once. (e.g. the
117 * periodic 11 min sync from time.c vs. this driver.)
118 */
120 #include <linux/types.h>
121 #include <linux/errno.h>
122 #include <linux/miscdevice.h>
123 #include <linux/slab.h>
124 #include <linux/ioport.h>
125 #include <linux/fcntl.h>
126 #include <linux/mc146818rtc.h>
127 #include <linux/init.h>
128 #include <linux/proc_fs.h>
129 #include <linux/spinlock.h>
131 #include <asm/io.h>
132 #include <asm/uaccess.h>
133 #include <asm/system.h>
135 static DEFINE_SPINLOCK(nvram_state_lock);
136 static int nvram_open_cnt; /* #times opened */
137 static int nvram_open_mode; /* special open modes */
138 #define NVRAM_WRITE 1 /* opened for writing (exclusive) */
139 #define NVRAM_EXCL 2 /* opened with O_EXCL */
141 static int mach_check_checksum(void);
142 static void mach_set_checksum(void);
144 #ifdef CONFIG_PROC_FS
145 static int mach_proc_infos(unsigned char *contents, char *buffer, int *len,
146 off_t *begin, off_t offset, int size);
147 #endif
149 /*
150 * These functions are provided to be called internally or by other parts of
151 * the kernel. It's up to the caller to ensure correct checksum before reading
152 * or after writing (needs to be done only once).
153 *
154 * It is worth noting that these functions all access bytes of general
155 * purpose memory in the NVRAM - that is to say, they all add the
156 * NVRAM_FIRST_BYTE offset. Pass them offsets into NVRAM as if you did not
157 * know about the RTC cruft.
158 */
160 unsigned char
161 __nvram_read_byte(int i)
162 {
163 return CMOS_READ(NVRAM_FIRST_BYTE + i);
164 }
166 unsigned char
167 nvram_read_byte(int i)
168 {
169 unsigned long flags;
170 unsigned char c;
172 spin_lock_irqsave(&rtc_lock, flags);
173 c = __nvram_read_byte(i);
174 spin_unlock_irqrestore(&rtc_lock, flags);
175 return c;
176 }
178 /* This races nicely with trying to read with checksum checking (nvram_read) */
179 void
180 __nvram_write_byte(unsigned char c, int i)
181 {
182 CMOS_WRITE(c, NVRAM_FIRST_BYTE + i);
183 }
185 void
186 nvram_write_byte(unsigned char c, int i)
187 {
188 unsigned long flags;
190 spin_lock_irqsave(&rtc_lock, flags);
191 __nvram_write_byte(c, i);
192 spin_unlock_irqrestore(&rtc_lock, flags);
193 }
195 int
196 __nvram_check_checksum(void)
197 {
198 return mach_check_checksum();
199 }
201 int
202 nvram_check_checksum(void)
203 {
204 unsigned long flags;
205 int rv;
207 spin_lock_irqsave(&rtc_lock, flags);
208 rv = __nvram_check_checksum();
209 spin_unlock_irqrestore(&rtc_lock, flags);
210 return rv;
211 }
213 static void
214 __nvram_set_checksum(void)
215 {
216 mach_set_checksum();
217 }
219 #if 0
220 void
221 nvram_set_checksum(void)
222 {
223 unsigned long flags;
225 spin_lock_irqsave(&rtc_lock, flags);
226 __nvram_set_checksum();
227 spin_unlock_irqrestore(&rtc_lock, flags);
228 }
229 #endif /* 0 */
231 /*
232 * The are the file operation function for user access to /dev/nvram
233 */
235 static loff_t nvram_llseek(struct file *file,loff_t offset, int origin )
236 {
237 lock_kernel();
238 switch (origin) {
239 case 0:
240 /* nothing to do */
241 break;
242 case 1:
243 offset += file->f_pos;
244 break;
245 case 2:
246 offset += NVRAM_BYTES;
247 break;
248 }
249 unlock_kernel();
250 return (offset >= 0) ? (file->f_pos = offset) : -EINVAL;
251 }
253 static ssize_t
254 nvram_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
255 {
256 unsigned char contents[NVRAM_BYTES];
257 unsigned i = *ppos;
258 unsigned char *tmp;
260 spin_lock_irq(&rtc_lock);
262 if (!__nvram_check_checksum())
263 goto checksum_err;
265 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
266 *tmp = __nvram_read_byte(i);
268 spin_unlock_irq(&rtc_lock);
270 if (copy_to_user(buf, contents, tmp - contents))
271 return -EFAULT;
273 *ppos = i;
275 return tmp - contents;
277 checksum_err:
278 spin_unlock_irq(&rtc_lock);
279 return -EIO;
280 }
282 static ssize_t
283 nvram_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
284 {
285 unsigned char contents[NVRAM_BYTES];
286 unsigned i = *ppos;
287 unsigned char *tmp;
288 int len;
290 len = (NVRAM_BYTES - i) < count ? (NVRAM_BYTES - i) : count;
291 if (copy_from_user(contents, buf, len))
292 return -EFAULT;
294 spin_lock_irq(&rtc_lock);
296 if (!__nvram_check_checksum())
297 goto checksum_err;
299 for (tmp = contents; count-- > 0 && i < NVRAM_BYTES; ++i, ++tmp)
300 __nvram_write_byte(*tmp, i);
302 __nvram_set_checksum();
304 spin_unlock_irq(&rtc_lock);
306 *ppos = i;
308 return tmp - contents;
310 checksum_err:
311 spin_unlock_irq(&rtc_lock);
312 return -EIO;
313 }
315 static int
316 nvram_ioctl(struct inode *inode, struct file *file,
317 unsigned int cmd, unsigned long arg)
318 {
319 int i;
321 switch (cmd) {
323 case NVRAM_INIT:
324 /* initialize NVRAM contents and checksum */
325 if (!capable(CAP_SYS_ADMIN))
326 return -EACCES;
328 spin_lock_irq(&rtc_lock);
330 for (i = 0; i < NVRAM_BYTES; ++i)
331 __nvram_write_byte(0, i);
332 __nvram_set_checksum();
334 spin_unlock_irq(&rtc_lock);
335 return 0;
337 case NVRAM_SETCKS:
338 /* just set checksum, contents unchanged (maybe useful after
339 * checksum garbaged somehow...) */
340 if (!capable(CAP_SYS_ADMIN))
341 return -EACCES;
343 spin_lock_irq(&rtc_lock);
344 __nvram_set_checksum();
345 spin_unlock_irq(&rtc_lock);
346 return 0;
348 default:
349 return -ENOTTY;
350 }
351 }
353 static int
354 nvram_open(struct inode *inode, struct file *file)
355 {
356 spin_lock(&nvram_state_lock);
358 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
359 (nvram_open_mode & NVRAM_EXCL) ||
360 ((file->f_mode & 2) && (nvram_open_mode & NVRAM_WRITE))) {
361 spin_unlock(&nvram_state_lock);
362 return -EBUSY;
363 }
365 if (file->f_flags & O_EXCL)
366 nvram_open_mode |= NVRAM_EXCL;
367 if (file->f_mode & 2)
368 nvram_open_mode |= NVRAM_WRITE;
369 nvram_open_cnt++;
371 spin_unlock(&nvram_state_lock);
373 return 0;
374 }
376 static int
377 nvram_release(struct inode *inode, struct file *file)
378 {
379 spin_lock(&nvram_state_lock);
381 nvram_open_cnt--;
383 /* if only one instance is open, clear the EXCL bit */
384 if (nvram_open_mode & NVRAM_EXCL)
385 nvram_open_mode &= ~NVRAM_EXCL;
386 if (file->f_mode & 2)
387 nvram_open_mode &= ~NVRAM_WRITE;
389 spin_unlock(&nvram_state_lock);
391 return 0;
392 }
394 #ifndef CONFIG_PROC_FS
395 static int
396 nvram_read_proc(char *buffer, char **start, off_t offset,
397 int size, int *eof, void *data)
398 {
399 return 0;
400 }
401 #else
403 static int
404 nvram_read_proc(char *buffer, char **start, off_t offset,
405 int size, int *eof, void *data)
406 {
407 unsigned char contents[NVRAM_BYTES];
408 int i, len = 0;
409 off_t begin = 0;
411 spin_lock_irq(&rtc_lock);
412 for (i = 0; i < NVRAM_BYTES; ++i)
413 contents[i] = __nvram_read_byte(i);
414 spin_unlock_irq(&rtc_lock);
416 *eof = mach_proc_infos(contents, buffer, &len, &begin, offset, size);
418 if (offset >= begin + len)
419 return 0;
420 *start = buffer + (offset - begin);
421 return (size < begin + len - offset) ? size : begin + len - offset;
423 }
425 /* This macro frees the machine specific function from bounds checking and
426 * this like that... */
427 #define PRINT_PROC(fmt,args...) \
428 do { \
429 *len += sprintf(buffer+*len, fmt, ##args); \
430 if (*begin + *len > offset + size) \
431 return 0; \
432 if (*begin + *len < offset) { \
433 *begin += *len; \
434 *len = 0; \
435 } \
436 } while(0)
438 #endif /* CONFIG_PROC_FS */
440 static const struct file_operations nvram_fops = {
441 .owner = THIS_MODULE,
442 .llseek = nvram_llseek,
443 .read = nvram_read,
444 .write = nvram_write,
445 .ioctl = nvram_ioctl,
446 .open = nvram_open,
447 .release = nvram_release,
448 };
450 static struct miscdevice nvram_dev = {
451 NVRAM_MINOR,
452 "nvram",
453 &nvram_fops
454 };
456 static int __init
457 nvram_init(void)
458 {
459 int ret;
461 /* First test whether the driver should init at all */
462 if (!CHECK_DRIVER_INIT())
463 return -ENXIO;
465 ret = misc_register(&nvram_dev);
466 if (ret) {
467 printk(KERN_ERR "nvram: can't misc_register on minor=%d\n",
468 NVRAM_MINOR);
469 goto out;
470 }
471 if (!create_proc_read_entry("driver/nvram", 0, NULL, nvram_read_proc,
472 NULL)) {
473 printk(KERN_ERR "nvram: can't create /proc/driver/nvram\n");
474 ret = -ENOMEM;
475 goto outmisc;
476 }
477 ret = 0;
478 printk(KERN_INFO "Non-volatile memory driver v" NVRAM_VERSION "\n");
479 out:
480 return ret;
481 outmisc:
482 misc_deregister(&nvram_dev);
483 goto out;
484 }
486 static void __exit
487 nvram_cleanup_module(void)
488 {
489 remove_proc_entry("driver/nvram", NULL);
490 misc_deregister(&nvram_dev);
491 }
493 module_init(nvram_init);
494 module_exit(nvram_cleanup_module);
496 /*
497 * Machine specific functions
498 */
500 #if MACH == PC
502 static int
503 pc_check_checksum(void)
504 {
505 int i;
506 unsigned short sum = 0;
507 unsigned short expect;
509 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
510 sum += __nvram_read_byte(i);
511 expect = __nvram_read_byte(PC_CKS_LOC)<<8 |
512 __nvram_read_byte(PC_CKS_LOC+1);
513 return ((sum & 0xffff) == expect);
514 }
516 static void
517 pc_set_checksum(void)
518 {
519 int i;
520 unsigned short sum = 0;
522 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
523 sum += __nvram_read_byte(i);
524 __nvram_write_byte(sum >> 8, PC_CKS_LOC);
525 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);
526 }
528 #ifdef CONFIG_PROC_FS
530 static char *floppy_types[] = {
531 "none", "5.25'' 360k", "5.25'' 1.2M", "3.5'' 720k", "3.5'' 1.44M",
532 "3.5'' 2.88M", "3.5'' 2.88M"
533 };
535 static char *gfx_types[] = {
536 "EGA, VGA, ... (with BIOS)",
537 "CGA (40 cols)",
538 "CGA (80 cols)",
539 "monochrome",
540 };
542 static int
543 pc_proc_infos(unsigned char *nvram, char *buffer, int *len,
544 off_t *begin, off_t offset, int size)
545 {
546 int checksum;
547 int type;
549 spin_lock_irq(&rtc_lock);
550 checksum = __nvram_check_checksum();
551 spin_unlock_irq(&rtc_lock);
553 PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");
555 PRINT_PROC("# floppies : %d\n",
556 (nvram[6] & 1) ? (nvram[6] >> 6) + 1 : 0);
557 PRINT_PROC("Floppy 0 type : ");
558 type = nvram[2] >> 4;
559 if (type < ARRAY_SIZE(floppy_types))
560 PRINT_PROC("%s\n", floppy_types[type]);
561 else
562 PRINT_PROC("%d (unknown)\n", type);
563 PRINT_PROC("Floppy 1 type : ");
564 type = nvram[2] & 0x0f;
565 if (type < ARRAY_SIZE(floppy_types))
566 PRINT_PROC("%s\n", floppy_types[type]);
567 else
568 PRINT_PROC("%d (unknown)\n", type);
570 PRINT_PROC("HD 0 type : ");
571 type = nvram[4] >> 4;
572 if (type)
573 PRINT_PROC("%02x\n", type == 0x0f ? nvram[11] : type);
574 else
575 PRINT_PROC("none\n");
577 PRINT_PROC("HD 1 type : ");
578 type = nvram[4] & 0x0f;
579 if (type)
580 PRINT_PROC("%02x\n", type == 0x0f ? nvram[12] : type);
581 else
582 PRINT_PROC("none\n");
584 PRINT_PROC("HD type 48 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
585 nvram[18] | (nvram[19] << 8),
586 nvram[20], nvram[25],
587 nvram[21] | (nvram[22] << 8), nvram[23] | (nvram[24] << 8));
588 PRINT_PROC("HD type 49 data: %d/%d/%d C/H/S, precomp %d, lz %d\n",
589 nvram[39] | (nvram[40] << 8),
590 nvram[41], nvram[46],
591 nvram[42] | (nvram[43] << 8), nvram[44] | (nvram[45] << 8));
593 PRINT_PROC("DOS base memory: %d kB\n", nvram[7] | (nvram[8] << 8));
594 PRINT_PROC("Extended memory: %d kB (configured), %d kB (tested)\n",
595 nvram[9] | (nvram[10] << 8), nvram[34] | (nvram[35] << 8));
597 PRINT_PROC("Gfx adapter : %s\n", gfx_types[(nvram[6] >> 4) & 3]);
599 PRINT_PROC("FPU : %sinstalled\n",
600 (nvram[6] & 2) ? "" : "not ");
602 return 1;
603 }
604 #endif
606 #endif /* MACH == PC */
608 #if MACH == COBALT
610 /* the cobalt CMOS has a wider range of its checksum */
611 static int cobalt_check_checksum(void)
612 {
613 int i;
614 unsigned short sum = 0;
615 unsigned short expect;
617 for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) {
618 if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1)))
619 continue;
621 sum += __nvram_read_byte(i);
622 }
623 expect = __nvram_read_byte(COBT_CMOS_CHECKSUM) << 8 |
624 __nvram_read_byte(COBT_CMOS_CHECKSUM+1);
625 return ((sum & 0xffff) == expect);
626 }
628 static void cobalt_set_checksum(void)
629 {
630 int i;
631 unsigned short sum = 0;
633 for (i = COBT_CMOS_CKS_START; i <= COBT_CMOS_CKS_END; ++i) {
634 if ((i == COBT_CMOS_CHECKSUM) || (i == (COBT_CMOS_CHECKSUM+1)))
635 continue;
637 sum += __nvram_read_byte(i);
638 }
640 __nvram_write_byte(sum >> 8, COBT_CMOS_CHECKSUM);
641 __nvram_write_byte(sum & 0xff, COBT_CMOS_CHECKSUM+1);
642 }
644 #ifdef CONFIG_PROC_FS
646 static int cobalt_proc_infos(unsigned char *nvram, char *buffer, int *len,
647 off_t *begin, off_t offset, int size)
648 {
649 int i;
650 unsigned int checksum;
651 unsigned int flags;
652 char sernum[14];
653 char *key = "cNoEbTaWlOtR!";
654 unsigned char bto_csum;
656 spin_lock_irq(&rtc_lock);
657 checksum = __nvram_check_checksum();
658 spin_unlock_irq(&rtc_lock);
660 PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");
662 flags = nvram[COBT_CMOS_FLAG_BYTE_0] << 8
663 | nvram[COBT_CMOS_FLAG_BYTE_1];
665 PRINT_PROC("Console: %s\n",
666 flags & COBT_CMOS_CONSOLE_FLAG ? "on": "off");
668 PRINT_PROC("Firmware Debug Messages: %s\n",
669 flags & COBT_CMOS_DEBUG_FLAG ? "on": "off");
671 PRINT_PROC("Auto Prompt: %s\n",
672 flags & COBT_CMOS_AUTO_PROMPT_FLAG ? "on": "off");
674 PRINT_PROC("Shutdown Status: %s\n",
675 flags & COBT_CMOS_CLEAN_BOOT_FLAG ? "clean": "dirty");
677 PRINT_PROC("Hardware Probe: %s\n",
678 flags & COBT_CMOS_HW_NOPROBE_FLAG ? "partial": "full");
680 PRINT_PROC("System Fault: %sdetected\n",
681 flags & COBT_CMOS_SYSFAULT_FLAG ? "": "not ");
683 PRINT_PROC("Panic on OOPS: %s\n",
684 flags & COBT_CMOS_OOPSPANIC_FLAG ? "yes": "no");
686 PRINT_PROC("Delayed Cache Initialization: %s\n",
687 flags & COBT_CMOS_DELAY_CACHE_FLAG ? "yes": "no");
689 PRINT_PROC("Show Logo at Boot: %s\n",
690 flags & COBT_CMOS_NOLOGO_FLAG ? "no": "yes");
692 PRINT_PROC("Boot Method: ");
693 switch (nvram[COBT_CMOS_BOOT_METHOD]) {
694 case COBT_CMOS_BOOT_METHOD_DISK:
695 PRINT_PROC("disk\n");
696 break;
698 case COBT_CMOS_BOOT_METHOD_ROM:
699 PRINT_PROC("rom\n");
700 break;
702 case COBT_CMOS_BOOT_METHOD_NET:
703 PRINT_PROC("net\n");
704 break;
706 default:
707 PRINT_PROC("unknown\n");
708 break;
709 }
711 PRINT_PROC("Primary Boot Device: %d:%d\n",
712 nvram[COBT_CMOS_BOOT_DEV0_MAJ],
713 nvram[COBT_CMOS_BOOT_DEV0_MIN] );
714 PRINT_PROC("Secondary Boot Device: %d:%d\n",
715 nvram[COBT_CMOS_BOOT_DEV1_MAJ],
716 nvram[COBT_CMOS_BOOT_DEV1_MIN] );
717 PRINT_PROC("Tertiary Boot Device: %d:%d\n",
718 nvram[COBT_CMOS_BOOT_DEV2_MAJ],
719 nvram[COBT_CMOS_BOOT_DEV2_MIN] );
721 PRINT_PROC("Uptime: %d\n",
722 nvram[COBT_CMOS_UPTIME_0] << 24 |
723 nvram[COBT_CMOS_UPTIME_1] << 16 |
724 nvram[COBT_CMOS_UPTIME_2] << 8 |
725 nvram[COBT_CMOS_UPTIME_3]);
727 PRINT_PROC("Boot Count: %d\n",
728 nvram[COBT_CMOS_BOOTCOUNT_0] << 24 |
729 nvram[COBT_CMOS_BOOTCOUNT_1] << 16 |
730 nvram[COBT_CMOS_BOOTCOUNT_2] << 8 |
731 nvram[COBT_CMOS_BOOTCOUNT_3]);
733 /* 13 bytes of serial num */
734 for (i=0 ; i<13 ; i++) {
735 sernum[i] = nvram[COBT_CMOS_SYS_SERNUM_0 + i];
736 }
737 sernum[13] = '\0';
739 checksum = 0;
740 for (i=0 ; i<13 ; i++) {
741 checksum += sernum[i] ^ key[i];
742 }
743 checksum = ((checksum & 0x7f) ^ (0xd6)) & 0xff;
745 PRINT_PROC("Serial Number: %s", sernum);
746 if (checksum != nvram[COBT_CMOS_SYS_SERNUM_CSUM]) {
747 PRINT_PROC(" (invalid checksum)");
748 }
749 PRINT_PROC("\n");
751 PRINT_PROC("Rom Revison: %d.%d.%d\n", nvram[COBT_CMOS_ROM_REV_MAJ],
752 nvram[COBT_CMOS_ROM_REV_MIN], nvram[COBT_CMOS_ROM_REV_REV]);
754 PRINT_PROC("BTO Server: %d.%d.%d.%d", nvram[COBT_CMOS_BTO_IP_0],
755 nvram[COBT_CMOS_BTO_IP_1], nvram[COBT_CMOS_BTO_IP_2],
756 nvram[COBT_CMOS_BTO_IP_3]);
757 bto_csum = nvram[COBT_CMOS_BTO_IP_0] + nvram[COBT_CMOS_BTO_IP_1]
758 + nvram[COBT_CMOS_BTO_IP_2] + nvram[COBT_CMOS_BTO_IP_3];
759 if (bto_csum != nvram[COBT_CMOS_BTO_IP_CSUM]) {
760 PRINT_PROC(" (invalid checksum)");
761 }
762 PRINT_PROC("\n");
764 if (flags & COBT_CMOS_VERSION_FLAG
765 && nvram[COBT_CMOS_VERSION] >= COBT_CMOS_VER_BTOCODE) {
766 PRINT_PROC("BTO Code: 0x%x\n",
767 nvram[COBT_CMOS_BTO_CODE_0] << 24 |
768 nvram[COBT_CMOS_BTO_CODE_1] << 16 |
769 nvram[COBT_CMOS_BTO_CODE_2] << 8 |
770 nvram[COBT_CMOS_BTO_CODE_3]);
771 }
773 return 1;
774 }
775 #endif /* CONFIG_PROC_FS */
777 #endif /* MACH == COBALT */
779 #if MACH == ATARI
781 static int
782 atari_check_checksum(void)
783 {
784 int i;
785 unsigned char sum = 0;
787 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
788 sum += __nvram_read_byte(i);
789 return (__nvram_read_byte(ATARI_CKS_LOC) == (~sum & 0xff) &&
790 __nvram_read_byte(ATARI_CKS_LOC + 1) == (sum & 0xff));
791 }
793 static void
794 atari_set_checksum(void)
795 {
796 int i;
797 unsigned char sum = 0;
799 for (i = ATARI_CKS_RANGE_START; i <= ATARI_CKS_RANGE_END; ++i)
800 sum += __nvram_read_byte(i);
801 __nvram_write_byte(~sum, ATARI_CKS_LOC);
802 __nvram_write_byte(sum, ATARI_CKS_LOC + 1);
803 }
805 #ifdef CONFIG_PROC_FS
807 static struct {
808 unsigned char val;
809 char *name;
810 } boot_prefs[] = {
811 { 0x80, "TOS" },
812 { 0x40, "ASV" },
813 { 0x20, "NetBSD (?)" },
814 { 0x10, "Linux" },
815 { 0x00, "unspecified" }
816 };
818 static char *languages[] = {
819 "English (US)",
820 "German",
821 "French",
822 "English (UK)",
823 "Spanish",
824 "Italian",
825 "6 (undefined)",
826 "Swiss (French)",
827 "Swiss (German)"
828 };
830 static char *dateformat[] = {
831 "MM%cDD%cYY",
832 "DD%cMM%cYY",
833 "YY%cMM%cDD",
834 "YY%cDD%cMM",
835 "4 (undefined)",
836 "5 (undefined)",
837 "6 (undefined)",
838 "7 (undefined)"
839 };
841 static char *colors[] = {
842 "2", "4", "16", "256", "65536", "??", "??", "??"
843 };
845 static int
846 atari_proc_infos(unsigned char *nvram, char *buffer, int *len,
847 off_t *begin, off_t offset, int size)
848 {
849 int checksum = nvram_check_checksum();
850 int i;
851 unsigned vmode;
853 PRINT_PROC("Checksum status : %svalid\n", checksum ? "" : "not ");
855 PRINT_PROC("Boot preference : ");
856 for (i = ARRAY_SIZE(boot_prefs) - 1; i >= 0; --i) {
857 if (nvram[1] == boot_prefs[i].val) {
858 PRINT_PROC("%s\n", boot_prefs[i].name);
859 break;
860 }
861 }
862 if (i < 0)
863 PRINT_PROC("0x%02x (undefined)\n", nvram[1]);
865 PRINT_PROC("SCSI arbitration : %s\n",
866 (nvram[16] & 0x80) ? "on" : "off");
867 PRINT_PROC("SCSI host ID : ");
868 if (nvram[16] & 0x80)
869 PRINT_PROC("%d\n", nvram[16] & 7);
870 else
871 PRINT_PROC("n/a\n");
873 /* the following entries are defined only for the Falcon */
874 if ((atari_mch_cookie >> 16) != ATARI_MCH_FALCON)
875 return 1;
877 PRINT_PROC("OS language : ");
878 if (nvram[6] < ARRAY_SIZE(languages))
879 PRINT_PROC("%s\n", languages[nvram[6]]);
880 else
881 PRINT_PROC("%u (undefined)\n", nvram[6]);
882 PRINT_PROC("Keyboard language: ");
883 if (nvram[7] < ARRAY_SIZE(languages))
884 PRINT_PROC("%s\n", languages[nvram[7]]);
885 else
886 PRINT_PROC("%u (undefined)\n", nvram[7]);
887 PRINT_PROC("Date format : ");
888 PRINT_PROC(dateformat[nvram[8] & 7],
889 nvram[9] ? nvram[9] : '/', nvram[9] ? nvram[9] : '/');
890 PRINT_PROC(", %dh clock\n", nvram[8] & 16 ? 24 : 12);
891 PRINT_PROC("Boot delay : ");
892 if (nvram[10] == 0)
893 PRINT_PROC("default");
894 else
895 PRINT_PROC("%ds%s\n", nvram[10],
896 nvram[10] < 8 ? ", no memory test" : "");
898 vmode = (nvram[14] << 8) || nvram[15];
899 PRINT_PROC("Video mode : %s colors, %d columns, %s %s monitor\n",
900 colors[vmode & 7],
901 vmode & 8 ? 80 : 40,
902 vmode & 16 ? "VGA" : "TV", vmode & 32 ? "PAL" : "NTSC");
903 PRINT_PROC(" %soverscan, compat. mode %s%s\n",
904 vmode & 64 ? "" : "no ",
905 vmode & 128 ? "on" : "off",
906 vmode & 256 ?
907 (vmode & 16 ? ", line doubling" : ", half screen") : "");
909 return 1;
910 }
911 #endif
913 #endif /* MACH == ATARI */
915 MODULE_LICENSE("GPL");
917 EXPORT_SYMBOL(__nvram_read_byte);
918 EXPORT_SYMBOL(nvram_read_byte);
919 EXPORT_SYMBOL(__nvram_write_byte);
920 EXPORT_SYMBOL(nvram_write_byte);
921 EXPORT_SYMBOL(__nvram_check_checksum);
922 EXPORT_SYMBOL(nvram_check_checksum);
923 MODULE_ALIAS_MISCDEV(NVRAM_MINOR);