blockdev.h

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#ifndef _GPXE_BLOCKDEV_H
#define _GPXE_BLOCKDEV_H

/**
 * @file
 *
 * Block devices
 *
 */

FILE_LICENCE ( GPL2_OR_LATER );

#include <gpxe/uaccess.h>

struct block_device;

/** Block device operations */
struct block_device_operations {
        /**
         * Read block
         *
         * @v blockdev  Block device
         * @v block     Block number
         * @v count     Block count
         * @v buffer    Data buffer
         * @ret rc      Return status code
         */
        int ( * read ) ( struct block_device *blockdev, uint64_t block,
                         unsigned long count, userptr_t buffer );
        /**
         * Write block
         *
         * @v blockdev  Block device
         * @v block     Block number
         * @v count     Block count
         * @v buffer    Data buffer
         * @ret rc      Return status code
         */
        int ( * write ) ( struct block_device *blockdev, uint64_t block,
                          unsigned long count, userptr_t buffer );
};

/** A block device */
struct block_device {
        /** Block device operations */
        struct block_device_operations *op;
        /** Block size */
        size_t blksize;
        /** Total number of blocks */
        uint64_t blocks;
};

#endif /* _GPXE_BLOCKDEV_H */