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Defined SCSI device interface, and added SCSI block device

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implementation.
This commit is contained in:
Michael Brown
2006-05-13 11:37:50 +00:00
parent 8638a5e471
commit f33f01c126
2 changed files with 281 additions and 9 deletions
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148
src/include/gpxe/scsi.h
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@@ -2,9 +2,39 @@
#define _GPXE_SCSI_H
#include <stdint.h>
#include <gpxe/blockdev.h>
struct scsi_cdb_read_10 {
/** Opcode */
/**
* @defgroup scsiops SCSI operation codes
* @{
*/
#define SCSI_OPCODE_READ_16 0x88 /**< READ (16) */
#define SCSI_OPCODE_WRITE_16 0x8a /**< WRITE (16) */
#define SCSI_OPCODE_SERVICE_ACTION_IN 0x9e /**< SERVICE ACTION IN */
#define SCSI_SERVICE_ACTION_READ_CAPACITY_16 0x10 /**< READ CAPACITY (16) */
/** @} */
/**
* @defgroup scsiflags SCSI flags
* @{
*/
#define SCSI_FL_FUA_NV 0x02 /**< Force unit access to NVS */
#define SCSI_FL_FUA 0x08 /**< Force unit access */
#define SCSI_FL_DPO 0x10 /**< Disable cache page out */
/** @} */
/**
* @defgroup scsicdbs SCSI command data blocks
* @{
*/
/** A SCSI "READ (16)" CDB */
struct scsi_cdb_read_16 {
/** Opcode (0x88) */
uint8_t opcode;
/** Flags */
uint8_t flags;
@@ -12,23 +42,123 @@ struct scsi_cdb_read_10 {
*
* This is a logical block number, in big-endian order.
*/
uint32_t lba;
/** Group number */
uint8_t group;
uint64_t lba;
/** Transfer length
*
* This is a logical block count.
* This is a logical block count, in big-endian order.
*/
uint16_t len;
uint32_t len;
/** Group number */
uint8_t group;
/** Control byte */
uint8_t control;
} __attribute__ (( packed ));
#define SCSI_OPCODE_READ_10 0x28
/** A SCSI "WRITE (16)" CDB */
struct scsi_cdb_write_16 {
/** Opcode (0x8a) */
uint8_t opcode;
/** Flags */
uint8_t flags;
/** Start address
*
* This is a logical block number, in big-endian order.
*/
uint64_t lba;
/** Transfer length
*
* This is a logical block count, in big-endian order.
*/
uint32_t len;
/** Group number */
uint8_t group;
/** Control byte */
uint8_t control;
} __attribute__ (( packed ));
/** A SCSI "READ CAPACITY (16)" CDB */
struct scsi_cdb_read_capacity_16 {
/** Opcode (0x9e) */
uint8_t opcode;
/** Service action */
uint8_t service_action;
/** Logical block address
*
* Applicable only if the PMI bit is set.
*/
uint64_t lba;
/** Transfer length
*
* This is the size of the data-in buffer, in bytes.
*/
uint32_t len;
/** Reserved */
uint8_t reserved;
/** Control byte */
uint8_t control;
} __attribute__ (( packed ));
/** SCSI "READ CAPACITY (16)" parameter data */
struct scsi_capacity_16 {
/** Maximum logical block number */
uint64_t lba;
/** Block length in bytes */
uint32_t blksize;
/** Reserved */
uint8_t reserved[20];
} __attribute__ (( packed ));
/** A SCSI Command Data Block */
union scsi_cdb {
struct scsi_cdb_read_10 read_10;
struct scsi_cdb_read_16 read16;
struct scsi_cdb_write_16 write16;
struct scsi_cdb_read_capacity_16 readcap16;
char bytes[16];
};
/** @} */
/** A SCSI command */
struct scsi_command {
/** CDB for this command */
union scsi_cdb cdb;
/** Data-out buffer (may be NULL) */
const void *data_out;
/** Data-out buffer length
*
* Must be zero if @c data_out is NULL
*/
size_t data_out_len;
/** Data-in buffer (may be NULL) */
void *data_in;
/** Data-in buffer length
*
* Must be zero if @c data_in is NULL
*/
size_t data_in_len;
};
/** A SCSI device */
struct scsi_device {
/** Block device interface */
struct block_device blockdev;
/** Logical unit number (LUN)
*
* This is a four-level LUN as specified by SAM-2, in
* big-endian order.
*/
uint64_t lun;
/**
* Issue SCSI command
*
* @v scsi SCSI device
* @v command SCSI command
* @ret rc Return status code
*/
int ( * command ) ( struct scsi_device *scsi,
struct scsi_command *command );
};
extern int init_scsidev ( struct scsi_device *scsi );
#endif /* _GPXE_SCSI_H */