sysadmin/ipxe
1
0
Fork 0
mirror of https://github.com/ipxe/ipxe synced 2025-12-31 23:52:53 +03:00
Code Issues Packages Projects Releases Wiki Activity

Abstracted out part of the concept of an SPI device to a generalised NVS

Browse Source 
device.

Separated the mechanisms of non-volatile storage access and non-volatile
stored options.
This commit is contained in:
Michael Brown
2006-12-04 18:23:06 +00:00
parent dc06c895fc
commit 946967f09c
12 changed files with 275 additions and 240 deletions
Download Patch File Download Diff File Expand all files Collapse all files

55
src/include/gpxe/nvs.h
View File

@@ -9,22 +9,53 @@
#include <stdint.h>
struct nvs_operations;
/** A non-volatile storage device */
struct nvs_device {
struct dhcp_option_block *options;
size_t len;
struct nvs_operations *op;
};
struct nvs_operations {
int ( * read ) ( struct nvs_device *nvs, unsigned int offset,
/** Word length, in bits */
unsigned int word_len;
/** Device size (in words) */
unsigned int size;
/** Data block size (in words)
*
* This is the block size used by the device. It must be a
* power of two. Data reads and writes must not cross a block
* boundary.
*
* Many devices allow reads to cross a block boundary, and
* restrict only writes. For the sake of simplicity, we
* assume that the same restriction applies to both reads and
* writes.
*/
unsigned int block_size;
/** Read data from device
*
* @v nvs NVS device
* @v address Address from which to read
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*
* Reads may not cross a block boundary.
*/
int ( * read ) ( struct nvs_device *nvs, unsigned int address,
void *data, size_t len );
int ( * write ) ( struct nvs_device *nvs, unsigned int offset,
/** Write data to device
*
* @v nvs NVS device
* @v address Address to which to write
* @v data Data buffer
* @v len Length of data buffer
* @ret rc Return status code
*
* Writes may not cross a block boundary.
*/
int ( * write ) ( struct nvs_device *nvs, unsigned int address,
const void *data, size_t len );
};
extern int nvs_register ( struct nvs_device *nvs );
extern void nvs_unregister ( struct nvs_device *nvs );
extern int nvs_read ( struct nvs_device *nvs, unsigned int address,
void *data, size_t len );
extern int nvs_write ( struct nvs_device *nvs, unsigned int address,
const void *data, size_t len );
#endif /* _GPXE_NVS_H */