/**
* Change the variable name to value. If name does not exist, create it,
* otherwise replace the old value with the new.
* @param *name name to modify
* @param *value value to set name
* @return OK on successful change, SYSERR on failure
*/
devcall nvramSet(char *name, char *value)
{
struct nvram_tuple *tuple;
ulong length, offset;
if (OK != nvramInit())
{
return SYSERR;
}
length = sizeof(struct nvram_tuple) + strnlen(name, NVRAM_STRMAX)
+ 1 + strnlen(value, NVRAM_STRMAX);
/* check if name is already defined somewhere */
/* if so unset, so we can reset */
if (nvramGet(name) != NULL)
{
nvramUnset(name);
}
/* get enough space for both to be rounded up with \0 stored */
if (NULL == (tuple = (struct nvram_tuple *)memget(length)))
{
return SYSERR;
}
/* copy name into memory */
offset = 0;
strncpy(tuple->pair, name, strnlen(name, NVRAM_STRMAX));
offset += strnlen(name, NVRAM_STRMAX);
strncpy(tuple->pair + offset, "=", 1);
offset += 1;
strncpy(tuple->pair + offset, value, strnlen(value, NVRAM_STRMAX));
offset += strnlen(value, NVRAM_STRMAX);
strncpy(tuple->pair + offset, "\0", 1);
/* store pointer to name in nvram_tuple struct */
nvramInsert(tuple);
return OK;
}
/**
* Initialize the nvram variable structures for editing
* @return OK on success, SYSERR on failure
*/
devcall nvramInit(void)
{
struct dentry *devptr = NULL;
struct flash *flash = NULL;
uint nvbase, offset, index, pair_len;
uint nvram_length, size;
char *pair;
struct nvram_tuple *tuple;
/* check if we already have initialized nvram */
if (nvram_header != NULL && NVRAM_MAGIC == nvram_header->magic)
{
return OK;
}
#if FLASH
devptr = (device *)&devtab[FLASH];
#endif
if (NULL == devptr)
{
return SYSERR;
}
flash = &flashtab[devptr->minor];
/* zero out nvram_tuples pointers */
for (index = 0; index < NVRAM_NHASH; index++)
{
nvram_tuples[index] = NULL;
}
/* Scan flash at for NVRAM magic number */
nvbase = flash->base + flash->size - NVRAM_SIZE;
while (nvbase > flash->base)
{
if (NVRAM_MAGIC == *((uint *)nvbase))
break;
nvbase -= NVRAM_SIZE;
}
offset = 0;
/* find the head for data */
nvram_header =
(struct nvram_header *)memget(sizeof(struct nvram_header));
memcpy(nvram_header, (void *)nvbase, sizeof(struct nvram_header));
if (nvram_header->magic != NVRAM_MAGIC)
{
return SYSERR;
}
offset += sizeof(struct nvram_header);
/* loop through nvram variables and add to array */
nvram_length = nvram_header->length;
nvram_header->length = sizeof(struct nvram_header);
while (offset < nvram_length)
{
/* get the length of a string (name=value\0) */
pair = (char *)(nvbase + offset);
pair_len = strnlen(pair, nvram_length - offset);
/* set offset to next string */
offset += pair_len + 1;
if (pair_len <= 0)
{
continue;
}
/* allocate memory to store tuple */
size = sizeof(struct nvram_tuple) + pair_len;
tuple = memget(size);
/* store tuple */
memcpy(tuple->pair, pair, pair_len);
memcpy(tuple->pair + pair_len, "\0", 1);
nvramInsert(tuple);
}
return OK;
}
/**
* Initialize the nvram variable structures for editing
* @return OK on success, SYSERR on failure
*/
devcall nvramInit(void)
{
uint32 nvbase, offset, index, pair_len;
uint32 nvram_length, size;
char *pair;
struct nvram_tuple *tuple;
/* check if we already have initialized nvram */
if (nvram_header != NULL && NVRAM_MAGIC == nvram_header->magic)
{
return OK;
}
/* flash size passed in by loader in megabytes */
if (flash_size < 1024)
{
flash_size = flash_size << 20;
}
/* zero out nvram_tuples pointers */
for (index = 0; index < NVRAM_NHASH; index++)
{
nvram_tuples[index] = NULL;
}
/* Scan flash at for NVRAM magic number */
nvbase = FLASH_BASE + flash_size - NVRAM_SIZE;
while (nvbase > FLASH_BASE)
{
if (NVRAM_MAGIC == *((uint32 *)nvbase))
break;
nvbase -= NVRAM_SIZE;
}
offset = 0;
/* find the head for data */
nvram_header =
(struct nvram_header *)getmem(sizeof(struct nvram_header));
memcpy(nvram_header, (void *)nvbase, sizeof(struct nvram_header));
if (nvram_header->magic != NVRAM_MAGIC)
{
return SYSERR;
}
offset += sizeof(struct nvram_header);
/* loop through nvram variables and add to array */
nvram_length = nvram_header->length;
nvram_header->length = sizeof(struct nvram_header);
while (offset < nvram_length)
{
/* get the length of a string (name=value\0) */
pair = (char *)(nvbase + offset);
pair_len = strnlen(pair, nvram_length - offset);
/* set offset to next string */
offset += pair_len + 1;
if (pair_len <= 0)
{
continue;
}
/* allocate memory to store tuple */
size = sizeof(struct nvram_tuple) + pair_len;
tuple = (struct nvram_tuple *)getmem(size);
/* store tuple */
memcpy(tuple->pair, pair, pair_len);
memcpy(tuple->pair + pair_len, "\0", 1);
nvramInsert(tuple);
}
return OK;
}
