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[nvs] Allow for non-volatile storage devices without block boundaries

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Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2011-01-11 19:56:59 +00:00
parent 17b6a3c506
commit 8f8b55f187
2 changed files with 32 additions and 17 deletions
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48
src/drivers/nvs/nvs.c
View File

@ -30,6 +30,34 @@ FILE_LICENCE ( GPL2_OR_LATER );
*
*/
/**
* Calculate length up to next block boundary
*
* @v nvs NVS device
* @v address Starting address
* @v max_len Maximum length
* @ret len Length to use, stopping at block boundaries
*/
static size_t nvs_frag_len ( struct nvs_device *nvs, unsigned int address,
size_t max_len ) {
size_t frag_len;
/* If there are no block boundaries, return the maximum length */
if ( ! nvs->block_size )
return max_len;
/* Calculate space remaining up to next block boundary */
frag_len = ( ( nvs->block_size -
( address & ( nvs->block_size - 1 ) ) )
<< nvs->word_len_log2 );
/* Limit to maximum length */
if ( max_len < frag_len )
return max_len;
return frag_len;
}
/**
* Read from non-volatile storage device
*
@ -51,14 +79,8 @@ int nvs_read ( struct nvs_device *nvs, unsigned int address,
while ( len ) {
/* Calculate space remaining up to next block boundary */
frag_len = ( ( nvs->block_size -
( address & ( nvs->block_size - 1 ) ) )
<< nvs->word_len_log2 );
/* Limit to space remaining in buffer */
if ( frag_len > len )
frag_len = len;
/* Calculate length to read, stopping at block boundaries */
frag_len = nvs_frag_len ( nvs, address, len );
/* Read this portion of the buffer from the device */
if ( ( rc = nvs->read ( nvs, address, data, frag_len ) ) != 0 )
@ -122,14 +144,8 @@ int nvs_write ( struct nvs_device *nvs, unsigned int address,
while ( len ) {
/* Calculate space remaining up to next block boundary */
frag_len = ( ( nvs->block_size -
( address & ( nvs->block_size - 1 ) ) )
<< nvs->word_len_log2 );
/* Limit to space remaining in buffer */
if ( frag_len > len )
frag_len = len;
/* Calculate length to write, stopping at block boundaries */
frag_len = nvs_frag_len ( nvs, address, len );
/* Write this portion of the buffer to the device */
if ( ( rc = nvs->write ( nvs, address, data, frag_len ) ) != 0)

1
src/drivers/nvs/nvsvpd.c
View File

@ -111,7 +111,6 @@ int nvs_vpd_init ( struct nvs_vpd_device *nvsvpd, struct pci_device *pci,
}
/* Initialise NVS device */
nvsvpd->nvs.block_size = 1;
nvsvpd->nvs.size = len;
nvsvpd->nvs.read = nvs_vpd_read;
nvsvpd->nvs.write = nvs_vpd_write;