--- /dev/null
+#ifndef _IPXE_SCSI_H
+#define _IPXE_SCSI_H
+
+#include <stdint.h>
+#include <ipxe/uaccess.h>
+#include <ipxe/interface.h>
+
+/** @file
+ *
+ * SCSI devices
+ *
+ */
+
+FILE_LICENCE ( GPL2_OR_LATER );
+
+/** Maximum block for READ/WRITE (10) commands */
+#define SCSI_MAX_BLOCK_10 0xffffffffULL
+
+/**
+ * @defgroup scsiops SCSI operation codes
+ * @{
+ */
+
+#define SCSI_OPCODE_READ_10 0x28 /**< READ (10) */
+#define SCSI_OPCODE_READ_16 0x88 /**< READ (16) */
+#define SCSI_OPCODE_WRITE_10 0x2a /**< WRITE (10) */
+#define SCSI_OPCODE_WRITE_16 0x8a /**< WRITE (16) */
+#define SCSI_OPCODE_READ_CAPACITY_10 0x25 /**< READ CAPACITY (10) */
+#define SCSI_OPCODE_SERVICE_ACTION_IN 0x9e /**< SERVICE ACTION IN */
+#define SCSI_SERVICE_ACTION_READ_CAPACITY_16 0x10 /**< READ CAPACITY (16) */
+#define SCSI_OPCODE_TEST_UNIT_READY 0x00 /**< TEST UNIT READY */
+
+/** @} */
+
+/**
+ * @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 (10)" CDB */
+struct scsi_cdb_read_10 {
+ /** Opcode (0x28) */
+ uint8_t opcode;
+ /** Flags */
+ uint8_t flags;
+ /** Start address
+ *
+ * This is a logical block number, in big-endian order.
+ */
+ uint32_t lba;
+ /** Group number */
+ uint8_t group;
+ /** Transfer length
+ *
+ * This is a logical block count, in big-endian order.
+ */
+ uint16_t len;
+ /** Control byte */
+ uint8_t control;
+} __attribute__ (( packed ));
+
+/** A SCSI "READ (16)" CDB */
+struct scsi_cdb_read_16 {
+ /** Opcode (0x88) */
+ 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 "WRITE (10)" CDB */
+struct scsi_cdb_write_10 {
+ /** Opcode (0x2a) */
+ uint8_t opcode;
+ /** Flags */
+ uint8_t flags;
+ /** Start address
+ *
+ * This is a logical block number, in big-endian order.
+ */
+ uint32_t lba;
+ /** Group number */
+ uint8_t group;
+ /** Transfer length
+ *
+ * This is a logical block count, in big-endian order.
+ */
+ uint16_t len;
+ /** Control byte */
+ uint8_t control;
+} __attribute__ (( packed ));
+
+/** 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 (10)" CDB */
+struct scsi_cdb_read_capacity_10 {
+ /** Opcode (0x25) */
+ uint8_t opcode;
+ /** Reserved */
+ uint8_t reserved_a;
+ /** Logical block address
+ *
+ * Applicable only if the PMI bit is set.
+ */
+ uint32_t lba;
+ /** Reserved */
+ uint8_t reserved_b[3];
+ /** Control byte */
+ uint8_t control;
+} __attribute__ (( packed ));
+
+/** SCSI "READ CAPACITY (10)" parameter data */
+struct scsi_capacity_10 {
+ /** Maximum logical block number */
+ uint32_t lba;
+ /** Block length in bytes */
+ uint32_t blksize;
+} __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 "TEST UNIT READY" CDB */
+struct scsi_cdb_test_unit_ready {
+ /** Opcode (0x00) */
+ uint8_t opcode;
+ /** Reserved */
+ uint8_t reserved[4];
+ /** Control byte */
+ uint8_t control;
+} __attribute__ (( packed ));
+
+/** A SCSI Command Data Block */
+union scsi_cdb {
+ struct scsi_cdb_read_10 read10;
+ struct scsi_cdb_read_16 read16;
+ struct scsi_cdb_write_10 write10;
+ struct scsi_cdb_write_16 write16;
+ struct scsi_cdb_read_capacity_10 readcap10;
+ struct scsi_cdb_read_capacity_16 readcap16;
+ struct scsi_cdb_test_unit_ready testready;
+ unsigned char bytes[16];
+};
+
+/** printf() format for dumping a scsi_cdb */
+#define SCSI_CDB_FORMAT "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:" \
+ "%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x"
+
+/** printf() parameters for dumping a scsi_cdb */
+#define SCSI_CDB_DATA(cdb) \
+ (cdb).bytes[0], (cdb).bytes[1], (cdb).bytes[2], (cdb).bytes[3], \
+ (cdb).bytes[4], (cdb).bytes[5], (cdb).bytes[6], (cdb).bytes[7], \
+ (cdb).bytes[8], (cdb).bytes[9], (cdb).bytes[10], (cdb).bytes[11], \
+ (cdb).bytes[12], (cdb).bytes[13], (cdb).bytes[14], (cdb).bytes[15]
+
+/** @} */
+
+/** A SCSI LUN
+ *
+ * This is a four-level LUN as specified by SAM-2, in big-endian
+ * order.
+ */
+struct scsi_lun {
+ uint16_t u16[4];
+} __attribute__ (( packed ));
+
+/** printf() format for dumping a scsi_lun */
+#define SCSI_LUN_FORMAT "%04x-%04x-%04x-%04x"
+
+/** printf() parameters for dumping a scsi_lun */
+#define SCSI_LUN_DATA(lun) \
+ ntohs ( (lun).u16[0] ), ntohs ( (lun).u16[1] ), \
+ ntohs ( (lun).u16[2] ), ntohs ( (lun).u16[3] )
+
+/** A SCSI command information unit */
+struct scsi_cmd {
+ /** LUN */
+ struct scsi_lun lun;
+ /** CDB for this command */
+ union scsi_cdb cdb;
+ /** Data-out buffer (may be NULL) */
+ userptr_t 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) */
+ userptr_t data_in;
+ /** Data-in buffer length
+ *
+ * Must be zero if @c data_in is NULL
+ */
+ size_t data_in_len;
+};
+
+/** SCSI fixed-format sense data */
+struct scsi_sns_fixed {
+ /** Response code */
+ uint8_t code;
+ /** Reserved */
+ uint8_t reserved;
+ /** Sense key */
+ uint8_t key;
+ /** Information */
+ uint32_t info;
+ /** Additional sense length */
+ uint8_t len;
+ /** Command-specific information */
+ uint32_t cs_info;
+ /** Additional sense code and qualifier */
+ uint16_t additional;
+} __attribute__ (( packed ));
+
+/** SCSI descriptor-format sense data */
+struct scsi_sns_descriptor {
+ /** Response code */
+ uint8_t code;
+ /** Sense key */
+ uint8_t key;
+ /** Additional sense code and qualifier */
+ uint16_t additional;
+} __attribute__ (( packed ));
+
+/** SCSI sense data */
+union scsi_sns {
+ /** Response code */
+ uint8_t code;
+ /** Fixed-format sense data */
+ struct scsi_sns_fixed fixed;
+ /** Descriptor-format sense data */
+ struct scsi_sns_descriptor desc;
+};
+
+/** SCSI sense response code mask */
+#define SCSI_SENSE_CODE_MASK 0x7f
+
+/** Test if SCSI sense data is in fixed format
+ *
+ * @v code Response code
+ * @ret is_fixed Sense data is in fixed format
+ */
+#define SCSI_SENSE_FIXED( code ) ( ( (code) & 0x7e ) == 0x70 )
+
+/** SCSI sense key mask */
+#define SCSI_SENSE_KEY_MASK 0x0f
+
+/** A SCSI response information unit */
+struct scsi_rsp {
+ /** SCSI status code */
+ uint8_t status;
+ /** Data overrun (or negative underrun) */
+ ssize_t overrun;
+ /** Autosense data (if any)
+ *
+ * To minimise code size, this is stored as the first four
+ * bytes of a descriptor-format sense data block (even if the
+ * response code indicates fixed-format sense data).
+ */
+ struct scsi_sns_descriptor sense;
+};
+
+extern int scsi_parse_lun ( const char *lun_string, struct scsi_lun *lun );
+extern void scsi_parse_sense ( const void *data, size_t len,
+ struct scsi_sns_descriptor *sense );
+
+extern int scsi_command ( struct interface *control, struct interface *data,
+ struct scsi_cmd *command );
+#define scsi_command_TYPE( object_type ) \
+ typeof ( int ( object_type, struct interface *data, \
+ struct scsi_cmd *command ) )
+
+extern void scsi_response ( struct interface *intf, struct scsi_rsp *response );
+#define scsi_response_TYPE( object_type ) \
+ typeof ( void ( object_type, struct scsi_rsp *response ) )
+
+extern int scsi_open ( struct interface *block, struct interface *scsi,
+ struct scsi_lun *lun );
+
+#endif /* _IPXE_SCSI_H */
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