nvram.c (d5bbb5021ce8d9ff561c7469f5b4589ccb3bc4a6) nvram.c (2d58636e0af724f38acad25246c1625efec36122)
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

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131 unsigned short sum = 0;
132
133 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
134 sum += __nvram_read_byte(i);
135 __nvram_write_byte(sum >> 8, PC_CKS_LOC);
136 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);
137}
138
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

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131 unsigned short sum = 0;
132
133 for (i = PC_CKS_RANGE_START; i <= PC_CKS_RANGE_END; ++i)
134 sum += __nvram_read_byte(i);
135 __nvram_write_byte(sum >> 8, PC_CKS_LOC);
136 __nvram_write_byte(sum & 0xff, PC_CKS_LOC + 1);
137}
138
139#if 0
140void nvram_set_checksum(void)
139static long pc_nvram_set_checksum(void)
141{
140{
142 unsigned long flags;
141 spin_lock_irq(&rtc_lock);
142 __nvram_set_checksum();
143 spin_unlock_irq(&rtc_lock);
144 return 0;
145}
143
146
144 spin_lock_irqsave(&rtc_lock, flags);
147static long pc_nvram_initialize(void)
148{
149 ssize_t i;
150
151 spin_lock_irq(&rtc_lock);
152 for (i = 0; i < NVRAM_BYTES; ++i)
153 __nvram_write_byte(0, i);
145 __nvram_set_checksum();
154 __nvram_set_checksum();
146 spin_unlock_irqrestore(&rtc_lock, flags);
155 spin_unlock_irq(&rtc_lock);
156 return 0;
147}
157}
148#endif /* 0 */
149
150static ssize_t pc_nvram_get_size(void)
151{
152 return NVRAM_BYTES;
153}
154
155const struct nvram_ops arch_nvram_ops = {
156 .read_byte = pc_nvram_read_byte,
157 .write_byte = pc_nvram_write_byte,
158 .get_size = pc_nvram_get_size,
158
159static ssize_t pc_nvram_get_size(void)
160{
161 return NVRAM_BYTES;
162}
163
164const struct nvram_ops arch_nvram_ops = {
165 .read_byte = pc_nvram_read_byte,
166 .write_byte = pc_nvram_write_byte,
167 .get_size = pc_nvram_get_size,
168 .set_checksum = pc_nvram_set_checksum,
169 .initialize = pc_nvram_initialize,
159};
160EXPORT_SYMBOL(arch_nvram_ops);
161#endif /* CONFIG_X86 */
162
163/*
164 * The are the file operation function for user access to /dev/nvram
165 */
166

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236checksum_err:
237 spin_unlock_irq(&rtc_lock);
238 return -EIO;
239}
240
241static long nvram_misc_ioctl(struct file *file, unsigned int cmd,
242 unsigned long arg)
243{
170};
171EXPORT_SYMBOL(arch_nvram_ops);
172#endif /* CONFIG_X86 */
173
174/*
175 * The are the file operation function for user access to /dev/nvram
176 */
177

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247checksum_err:
248 spin_unlock_irq(&rtc_lock);
249 return -EIO;
250}
251
252static long nvram_misc_ioctl(struct file *file, unsigned int cmd,
253 unsigned long arg)
254{
244 int i;
255 long ret = -ENOTTY;
245
246 switch (cmd) {
256
257 switch (cmd) {
247
248 case NVRAM_INIT:
249 /* initialize NVRAM contents and checksum */
250 if (!capable(CAP_SYS_ADMIN))
251 return -EACCES;
252
258 case NVRAM_INIT:
259 /* initialize NVRAM contents and checksum */
260 if (!capable(CAP_SYS_ADMIN))
261 return -EACCES;
262
253 mutex_lock(&nvram_mutex);
254 spin_lock_irq(&rtc_lock);
255
256 for (i = 0; i < NVRAM_BYTES; ++i)
257 __nvram_write_byte(0, i);
258 __nvram_set_checksum();
259
260 spin_unlock_irq(&rtc_lock);
261 mutex_unlock(&nvram_mutex);
262 return 0;
263
263 if (arch_nvram_ops.initialize != NULL) {
264 mutex_lock(&nvram_mutex);
265 ret = arch_nvram_ops.initialize();
266 mutex_unlock(&nvram_mutex);
267 }
268 break;
264 case NVRAM_SETCKS:
265 /* just set checksum, contents unchanged (maybe useful after
266 * checksum garbaged somehow...) */
267 if (!capable(CAP_SYS_ADMIN))
268 return -EACCES;
269
269 case NVRAM_SETCKS:
270 /* just set checksum, contents unchanged (maybe useful after
271 * checksum garbaged somehow...) */
272 if (!capable(CAP_SYS_ADMIN))
273 return -EACCES;
274
270 mutex_lock(&nvram_mutex);
271 spin_lock_irq(&rtc_lock);
272 __nvram_set_checksum();
273 spin_unlock_irq(&rtc_lock);
274 mutex_unlock(&nvram_mutex);
275 return 0;
276
277 default:
278 return -ENOTTY;
275 if (arch_nvram_ops.set_checksum != NULL) {
276 mutex_lock(&nvram_mutex);
277 ret = arch_nvram_ops.set_checksum();
278 mutex_unlock(&nvram_mutex);
279 }
280 break;
279 }
281 }
282 return ret;
280}
281
282static int nvram_misc_open(struct inode *inode, struct file *file)
283{
284 spin_lock(&nvram_state_lock);
285
283}
284
285static int nvram_misc_open(struct inode *inode, struct file *file)
286{
287 spin_lock(&nvram_state_lock);
288
289 /* Prevent multiple readers/writers if desired. */
286 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
290 if ((nvram_open_cnt && (file->f_flags & O_EXCL)) ||
287 (nvram_open_mode & NVRAM_EXCL) ||
288 ((file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE))) {
291 (nvram_open_mode & NVRAM_EXCL)) {
289 spin_unlock(&nvram_state_lock);
290 return -EBUSY;
291 }
292
292 spin_unlock(&nvram_state_lock);
293 return -EBUSY;
294 }
295
296 /* Prevent multiple writers if the set_checksum ioctl is implemented. */
297 if ((arch_nvram_ops.set_checksum != NULL) &&
298 (file->f_mode & FMODE_WRITE) && (nvram_open_mode & NVRAM_WRITE)) {
299 spin_unlock(&nvram_state_lock);
300 return -EBUSY;
301 }
302
293 if (file->f_flags & O_EXCL)
294 nvram_open_mode |= NVRAM_EXCL;
295 if (file->f_mode & FMODE_WRITE)
296 nvram_open_mode |= NVRAM_WRITE;
297 nvram_open_cnt++;
298
299 spin_unlock(&nvram_state_lock);
300

--- 167 unchanged lines hidden --- 		303 if (file->f_flags & O_EXCL)
304 nvram_open_mode |= NVRAM_EXCL;
305 if (file->f_mode & FMODE_WRITE)
306 nvram_open_mode |= NVRAM_WRITE;
307 nvram_open_cnt++;
308
309 spin_unlock(&nvram_state_lock);
310

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