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powerpc/nvram: Add nvram_find_partition()

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Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2010-08-02 10:01:58 +10:00
parent fa2b4e54d4
commit cf5cbf9f80
1 changed files with 22 additions and 0 deletions
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22
arch/powerpc/kernel/nvram_64.c
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@ -429,6 +429,28 @@ static int nvram_get_partition_size(loff_t data_index)
}
/**
* nvram_find_partition - Find an nvram partition by signature and name
* @name: Name of the partition or NULL for any name
* @sig: Signature to test against
* @out_size: if non-NULL, returns the size of the data part of the partition
*/
loff_t nvram_find_partition(const char *name, int sig, int *out_size)
{
struct nvram_partition *p;
list_for_each_entry(p, &nvram_part->partition, partition) {
if (p->header.signature == sig &&
(!name || !strncmp(p->header.name, name, 12))) {
if (out_size)
*out_size = (p->header.length - 1) *
NVRAM_BLOCK_LEN;
return p->index + NVRAM_HEADER_LEN;
}
}
return 0;
}
/* nvram_setup_partition
*
* This will setup the partition we need for buffering the