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[pci] Add generic configuration space backup/restore facility

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Some devices can only be reset via a mechanism that also resets the
card's PCI core, thus necessitating a backup and restore of all or
part of the PCI configuration space across a reset.
This commit is contained in:
Michael Brown
2009-10-14 02:06:01 +01:00
parent c9c411286a
commit 4175b778c2
2 changed files with 123 additions and 0 deletions
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33
src/include/gpxe/pcibackup.h Normal file
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#ifndef _GPXE_PCIBACKUP_H
#define _GPXE_PCIBACKUP_H
/** @file
*
* PCI configuration space backup and restoration
*
*/
FILE_LICENCE ( GPL2_OR_LATER );
#include <stdint.h>
/** A PCI configuration space backup */
struct pci_config_backup {
uint32_t dwords[64];
};
/** PCI configuration space backup exclusion list end marker */
#define PCI_CONFIG_BACKUP_EXCLUDE_END 0xff
/** Define a PCI configuration space backup exclusion list */
#define PCI_CONFIG_BACKUP_EXCLUDE(...) \
{ __VA_ARGS__, PCI_CONFIG_BACKUP_EXCLUDE_END }
extern void pci_backup ( struct pci_device *pci,
struct pci_config_backup *backup,
const uint8_t *exclude );
extern void pci_restore ( struct pci_device *pci,
struct pci_config_backup *backup,
const uint8_t *exclude );
#endif /* _GPXE_PCIBACKUP_H */