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Linux/arch/powerpc/kernel/nvram_64.c

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  1 /*
  2  *  c 2001 PPC 64 Team, IBM Corp
  3  *
  4  *      This program is free software; you can redistribute it and/or
  5  *      modify it under the terms of the GNU General Public License
  6  *      as published by the Free Software Foundation; either version
  7  *      2 of the License, or (at your option) any later version.
  8  *
  9  * /dev/nvram driver for PPC64
 10  *
 11  * This perhaps should live in drivers/char
 12  *
 13  * TODO: Split the /dev/nvram part (that one can use
 14  *       drivers/char/generic_nvram.c) from the arch & partition
 15  *       parsing code.
 16  */
 17 
 18 #include <linux/module.h>
 19 
 20 #include <linux/types.h>
 21 #include <linux/errno.h>
 22 #include <linux/fs.h>
 23 #include <linux/miscdevice.h>
 24 #include <linux/fcntl.h>
 25 #include <linux/nvram.h>
 26 #include <linux/init.h>
 27 #include <linux/slab.h>
 28 #include <linux/spinlock.h>
 29 #include <asm/uaccess.h>
 30 #include <asm/nvram.h>
 31 #include <asm/rtas.h>
 32 #include <asm/prom.h>
 33 #include <asm/machdep.h>
 34 
 35 #undef DEBUG_NVRAM
 36 
 37 #define NVRAM_HEADER_LEN        sizeof(struct nvram_header)
 38 #define NVRAM_BLOCK_LEN         NVRAM_HEADER_LEN
 39 
 40 /* If change this size, then change the size of NVNAME_LEN */
 41 struct nvram_header {
 42         unsigned char signature;
 43         unsigned char checksum;
 44         unsigned short length;
 45         /* Terminating null required only for names < 12 chars. */
 46         char name[12];
 47 };
 48 
 49 struct nvram_partition {
 50         struct list_head partition;
 51         struct nvram_header header;
 52         unsigned int index;
 53 };
 54 
 55 static LIST_HEAD(nvram_partitions);
 56 
 57 static loff_t dev_nvram_llseek(struct file *file, loff_t offset, int origin)
 58 {
 59         int size;
 60 
 61         if (ppc_md.nvram_size == NULL)
 62                 return -ENODEV;
 63         size = ppc_md.nvram_size();
 64 
 65         switch (origin) {
 66         case 1:
 67                 offset += file->f_pos;
 68                 break;
 69         case 2:
 70                 offset += size;
 71                 break;
 72         }
 73         if (offset < 0)
 74                 return -EINVAL;
 75         file->f_pos = offset;
 76         return file->f_pos;
 77 }
 78 
 79 
 80 static ssize_t dev_nvram_read(struct file *file, char __user *buf,
 81                           size_t count, loff_t *ppos)
 82 {
 83         ssize_t ret;
 84         char *tmp = NULL;
 85         ssize_t size;
 86 
 87         ret = -ENODEV;
 88         if (!ppc_md.nvram_size)
 89                 goto out;
 90 
 91         ret = 0;
 92         size = ppc_md.nvram_size();
 93         if (*ppos >= size || size < 0)
 94                 goto out;
 95 
 96         count = min_t(size_t, count, size - *ppos);
 97         count = min(count, PAGE_SIZE);
 98 
 99         ret = -ENOMEM;
100         tmp = kmalloc(count, GFP_KERNEL);
101         if (!tmp)
102                 goto out;
103 
104         ret = ppc_md.nvram_read(tmp, count, ppos);
105         if (ret <= 0)
106                 goto out;
107 
108         if (copy_to_user(buf, tmp, ret))
109                 ret = -EFAULT;
110 
111 out:
112         kfree(tmp);
113         return ret;
114 
115 }
116 
117 static ssize_t dev_nvram_write(struct file *file, const char __user *buf,
118                           size_t count, loff_t *ppos)
119 {
120         ssize_t ret;
121         char *tmp = NULL;
122         ssize_t size;
123 
124         ret = -ENODEV;
125         if (!ppc_md.nvram_size)
126                 goto out;
127 
128         ret = 0;
129         size = ppc_md.nvram_size();
130         if (*ppos >= size || size < 0)
131                 goto out;
132 
133         count = min_t(size_t, count, size - *ppos);
134         count = min(count, PAGE_SIZE);
135 
136         ret = -ENOMEM;
137         tmp = kmalloc(count, GFP_KERNEL);
138         if (!tmp)
139                 goto out;
140 
141         ret = -EFAULT;
142         if (copy_from_user(tmp, buf, count))
143                 goto out;
144 
145         ret = ppc_md.nvram_write(tmp, count, ppos);
146 
147 out:
148         kfree(tmp);
149         return ret;
150 
151 }
152 
153 static long dev_nvram_ioctl(struct file *file, unsigned int cmd,
154                             unsigned long arg)
155 {
156         switch(cmd) {
157 #ifdef CONFIG_PPC_PMAC
158         case OBSOLETE_PMAC_NVRAM_GET_OFFSET:
159                 printk(KERN_WARNING "nvram: Using obsolete PMAC_NVRAM_GET_OFFSET ioctl\n");
160         case IOC_NVRAM_GET_OFFSET: {
161                 int part, offset;
162 
163                 if (!machine_is(powermac))
164                         return -EINVAL;
165                 if (copy_from_user(&part, (void __user*)arg, sizeof(part)) != 0)
166                         return -EFAULT;
167                 if (part < pmac_nvram_OF || part > pmac_nvram_NR)
168                         return -EINVAL;
169                 offset = pmac_get_partition(part);
170                 if (offset < 0)
171                         return offset;
172                 if (copy_to_user((void __user*)arg, &offset, sizeof(offset)) != 0)
173                         return -EFAULT;
174                 return 0;
175         }
176 #endif /* CONFIG_PPC_PMAC */
177         default:
178                 return -EINVAL;
179         }
180 }
181 
182 const struct file_operations nvram_fops = {
183         .owner          = THIS_MODULE,
184         .llseek         = dev_nvram_llseek,
185         .read           = dev_nvram_read,
186         .write          = dev_nvram_write,
187         .unlocked_ioctl = dev_nvram_ioctl,
188 };
189 
190 static struct miscdevice nvram_dev = {
191         NVRAM_MINOR,
192         "nvram",
193         &nvram_fops
194 };
195 
196 
197 #ifdef DEBUG_NVRAM
198 static void __init nvram_print_partitions(char * label)
199 {
200         struct nvram_partition * tmp_part;
201         
202         printk(KERN_WARNING "--------%s---------\n", label);
203         printk(KERN_WARNING "indx\t\tsig\tchks\tlen\tname\n");
204         list_for_each_entry(tmp_part, &nvram_partitions, partition) {
205                 printk(KERN_WARNING "%4d    \t%02x\t%02x\t%d\t%12s\n",
206                        tmp_part->index, tmp_part->header.signature,
207                        tmp_part->header.checksum, tmp_part->header.length,
208                        tmp_part->header.name);
209         }
210 }
211 #endif
212 
213 
214 static int __init nvram_write_header(struct nvram_partition * part)
215 {
216         loff_t tmp_index;
217         int rc;
218         
219         tmp_index = part->index;
220         rc = ppc_md.nvram_write((char *)&part->header, NVRAM_HEADER_LEN, &tmp_index); 
221 
222         return rc;
223 }
224 
225 
226 static unsigned char __init nvram_checksum(struct nvram_header *p)
227 {
228         unsigned int c_sum, c_sum2;
229         unsigned short *sp = (unsigned short *)p->name; /* assume 6 shorts */
230         c_sum = p->signature + p->length + sp[0] + sp[1] + sp[2] + sp[3] + sp[4] + sp[5];
231 
232         /* The sum may have spilled into the 3rd byte.  Fold it back. */
233         c_sum = ((c_sum & 0xffff) + (c_sum >> 16)) & 0xffff;
234         /* The sum cannot exceed 2 bytes.  Fold it into a checksum */
235         c_sum2 = (c_sum >> 8) + (c_sum << 8);
236         c_sum = ((c_sum + c_sum2) >> 8) & 0xff;
237         return c_sum;
238 }
239 
240 /*
241  * Per the criteria passed via nvram_remove_partition(), should this
242  * partition be removed?  1=remove, 0=keep
243  */
244 static int nvram_can_remove_partition(struct nvram_partition *part,
245                 const char *name, int sig, const char *exceptions[])
246 {
247         if (part->header.signature != sig)
248                 return 0;
249         if (name) {
250                 if (strncmp(name, part->header.name, 12))
251                         return 0;
252         } else if (exceptions) {
253                 const char **except;
254                 for (except = exceptions; *except; except++) {
255                         if (!strncmp(*except, part->header.name, 12))
256                                 return 0;
257                 }
258         }
259         return 1;
260 }
261 
262 /**
263  * nvram_remove_partition - Remove one or more partitions in nvram
264  * @name: name of the partition to remove, or NULL for a
265  *        signature only match
266  * @sig: signature of the partition(s) to remove
267  * @exceptions: When removing all partitions with a matching signature,
268  *        leave these alone.
269  */
270 
271 int __init nvram_remove_partition(const char *name, int sig,
272                                                 const char *exceptions[])
273 {
274         struct nvram_partition *part, *prev, *tmp;
275         int rc;
276 
277         list_for_each_entry(part, &nvram_partitions, partition) {
278                 if (!nvram_can_remove_partition(part, name, sig, exceptions))
279                         continue;
280 
281                 /* Make partition a free partition */
282                 part->header.signature = NVRAM_SIG_FREE;
283                 strncpy(part->header.name, "wwwwwwwwwwww", 12);
284                 part->header.checksum = nvram_checksum(&part->header);
285                 rc = nvram_write_header(part);
286                 if (rc <= 0) {
287                         printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
288                         return rc;
289                 }
290         }
291 
292         /* Merge contiguous ones */
293         prev = NULL;
294         list_for_each_entry_safe(part, tmp, &nvram_partitions, partition) {
295                 if (part->header.signature != NVRAM_SIG_FREE) {
296                         prev = NULL;
297                         continue;
298                 }
299                 if (prev) {
300                         prev->header.length += part->header.length;
301                         prev->header.checksum = nvram_checksum(&part->header);
302                         rc = nvram_write_header(part);
303                         if (rc <= 0) {
304                                 printk(KERN_ERR "nvram_remove_partition: nvram_write failed (%d)\n", rc);
305                                 return rc;
306                         }
307                         list_del(&part->partition);
308                         kfree(part);
309                 } else
310                         prev = part;
311         }
312         
313         return 0;
314 }
315 
316 /**
317  * nvram_create_partition - Create a partition in nvram
318  * @name: name of the partition to create
319  * @sig: signature of the partition to create
320  * @req_size: size of data to allocate in bytes
321  * @min_size: minimum acceptable size (0 means req_size)
322  *
323  * Returns a negative error code or a positive nvram index
324  * of the beginning of the data area of the newly created
325  * partition. If you provided a min_size smaller than req_size
326  * you need to query for the actual size yourself after the
327  * call using nvram_partition_get_size().
328  */
329 loff_t __init nvram_create_partition(const char *name, int sig,
330                                      int req_size, int min_size)
331 {
332         struct nvram_partition *part;
333         struct nvram_partition *new_part;
334         struct nvram_partition *free_part = NULL;
335         static char nv_init_vals[16];
336         loff_t tmp_index;
337         long size = 0;
338         int rc;
339 
340         /* Convert sizes from bytes to blocks */
341         req_size = _ALIGN_UP(req_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
342         min_size = _ALIGN_UP(min_size, NVRAM_BLOCK_LEN) / NVRAM_BLOCK_LEN;
343 
344         /* If no minimum size specified, make it the same as the
345          * requested size
346          */
347         if (min_size == 0)
348                 min_size = req_size;
349         if (min_size > req_size)
350                 return -EINVAL;
351 
352         /* Now add one block to each for the header */
353         req_size += 1;
354         min_size += 1;
355 
356         /* Find a free partition that will give us the maximum needed size 
357            If can't find one that will give us the minimum size needed */
358         list_for_each_entry(part, &nvram_partitions, partition) {
359                 if (part->header.signature != NVRAM_SIG_FREE)
360                         continue;
361 
362                 if (part->header.length >= req_size) {
363                         size = req_size;
364                         free_part = part;
365                         break;
366                 }
367                 if (part->header.length > size &&
368                     part->header.length >= min_size) {
369                         size = part->header.length;
370                         free_part = part;
371                 }
372         }
373         if (!size)
374                 return -ENOSPC;
375         
376         /* Create our OS partition */
377         new_part = kmalloc(sizeof(*new_part), GFP_KERNEL);
378         if (!new_part) {
379                 pr_err("nvram_create_os_partition: kmalloc failed\n");
380                 return -ENOMEM;
381         }
382 
383         new_part->index = free_part->index;
384         new_part->header.signature = sig;
385         new_part->header.length = size;
386         strncpy(new_part->header.name, name, 12);
387         new_part->header.checksum = nvram_checksum(&new_part->header);
388 
389         rc = nvram_write_header(new_part);
390         if (rc <= 0) {
391                 pr_err("nvram_create_os_partition: nvram_write_header "
392                        "failed (%d)\n", rc);
393                 return rc;
394         }
395         list_add_tail(&new_part->partition, &free_part->partition);
396 
397         /* Adjust or remove the partition we stole the space from */
398         if (free_part->header.length > size) {
399                 free_part->index += size * NVRAM_BLOCK_LEN;
400                 free_part->header.length -= size;
401                 free_part->header.checksum = nvram_checksum(&free_part->header);
402                 rc = nvram_write_header(free_part);
403                 if (rc <= 0) {
404                         pr_err("nvram_create_os_partition: nvram_write_header "
405                                "failed (%d)\n", rc);
406                         return rc;
407                 }
408         } else {
409                 list_del(&free_part->partition);
410                 kfree(free_part);
411         } 
412 
413         /* Clear the new partition */
414         for (tmp_index = new_part->index + NVRAM_HEADER_LEN;
415              tmp_index <  ((size - 1) * NVRAM_BLOCK_LEN);
416              tmp_index += NVRAM_BLOCK_LEN) {
417                 rc = ppc_md.nvram_write(nv_init_vals, NVRAM_BLOCK_LEN, &tmp_index);
418                 if (rc <= 0) {
419                         pr_err("nvram_create_partition: nvram_write failed (%d)\n", rc);
420                         return rc;
421                 }
422         }
423         
424         return new_part->index + NVRAM_HEADER_LEN;
425 }
426 
427 /**
428  * nvram_get_partition_size - Get the data size of an nvram partition
429  * @data_index: This is the offset of the start of the data of
430  *              the partition. The same value that is returned by
431  *              nvram_create_partition().
432  */
433 int nvram_get_partition_size(loff_t data_index)
434 {
435         struct nvram_partition *part;
436         
437         list_for_each_entry(part, &nvram_partitions, partition) {
438                 if (part->index + NVRAM_HEADER_LEN == data_index)
439                         return (part->header.length - 1) * NVRAM_BLOCK_LEN;
440         }
441         return -1;
442 }
443 
444 
445 /**
446  * nvram_find_partition - Find an nvram partition by signature and name
447  * @name: Name of the partition or NULL for any name
448  * @sig: Signature to test against
449  * @out_size: if non-NULL, returns the size of the data part of the partition
450  */
451 loff_t nvram_find_partition(const char *name, int sig, int *out_size)
452 {
453         struct nvram_partition *p;
454 
455         list_for_each_entry(p, &nvram_partitions, partition) {
456                 if (p->header.signature == sig &&
457                     (!name || !strncmp(p->header.name, name, 12))) {
458                         if (out_size)
459                                 *out_size = (p->header.length - 1) *
460                                         NVRAM_BLOCK_LEN;
461                         return p->index + NVRAM_HEADER_LEN;
462                 }
463         }
464         return 0;
465 }
466 
467 int __init nvram_scan_partitions(void)
468 {
469         loff_t cur_index = 0;
470         struct nvram_header phead;
471         struct nvram_partition * tmp_part;
472         unsigned char c_sum;
473         char * header;
474         int total_size;
475         int err;
476 
477         if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
478                 return -ENODEV;
479         total_size = ppc_md.nvram_size();
480         
481         header = kmalloc(NVRAM_HEADER_LEN, GFP_KERNEL);
482         if (!header) {
483                 printk(KERN_ERR "nvram_scan_partitions: Failed kmalloc\n");
484                 return -ENOMEM;
485         }
486 
487         while (cur_index < total_size) {
488 
489                 err = ppc_md.nvram_read(header, NVRAM_HEADER_LEN, &cur_index);
490                 if (err != NVRAM_HEADER_LEN) {
491                         printk(KERN_ERR "nvram_scan_partitions: Error parsing "
492                                "nvram partitions\n");
493                         goto out;
494                 }
495 
496                 cur_index -= NVRAM_HEADER_LEN; /* nvram_read will advance us */
497 
498                 memcpy(&phead, header, NVRAM_HEADER_LEN);
499 
500                 err = 0;
501                 c_sum = nvram_checksum(&phead);
502                 if (c_sum != phead.checksum) {
503                         printk(KERN_WARNING "WARNING: nvram partition checksum"
504                                " was %02x, should be %02x!\n",
505                                phead.checksum, c_sum);
506                         printk(KERN_WARNING "Terminating nvram partition scan\n");
507                         goto out;
508                 }
509                 if (!phead.length) {
510                         printk(KERN_WARNING "WARNING: nvram corruption "
511                                "detected: 0-length partition\n");
512                         goto out;
513                 }
514                 tmp_part = (struct nvram_partition *)
515                         kmalloc(sizeof(struct nvram_partition), GFP_KERNEL);
516                 err = -ENOMEM;
517                 if (!tmp_part) {
518                         printk(KERN_ERR "nvram_scan_partitions: kmalloc failed\n");
519                         goto out;
520                 }
521                 
522                 memcpy(&tmp_part->header, &phead, NVRAM_HEADER_LEN);
523                 tmp_part->index = cur_index;
524                 list_add_tail(&tmp_part->partition, &nvram_partitions);
525                 
526                 cur_index += phead.length * NVRAM_BLOCK_LEN;
527         }
528         err = 0;
529 
530 #ifdef DEBUG_NVRAM
531         nvram_print_partitions("NVRAM Partitions");
532 #endif
533 
534  out:
535         kfree(header);
536         return err;
537 }
538 
539 static int __init nvram_init(void)
540 {
541         int rc;
542         
543         BUILD_BUG_ON(NVRAM_BLOCK_LEN != 16);
544 
545         if (ppc_md.nvram_size == NULL || ppc_md.nvram_size() <= 0)
546                 return  -ENODEV;
547 
548         rc = misc_register(&nvram_dev);
549         if (rc != 0) {
550                 printk(KERN_ERR "nvram_init: failed to register device\n");
551                 return rc;
552         }
553         
554         return rc;
555 }
556 
557 void __exit nvram_cleanup(void)
558 {
559         misc_deregister( &nvram_dev );
560 }
561 
562 module_init(nvram_init);
563 module_exit(nvram_cleanup);
564 MODULE_LICENSE("GPL");
565 

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