Archipelago » qemu

#ifndef __XEN_BLKIF_H__

#define __XEN_BLKIF_H__

#include <xen/io/ring.h>

#include <xen/io/blkif.h>

#include <xen/io/protocols.h>

/* Not a real protocol.  Used to generate ring structs which contain

 * the elements common to all protocols only.  This way we get a

 * compiler-checkable way to use common struct elements, so we can

 * avoid using switch(protocol) in a number of places.  */

struct blkif_common_request {

        char dummy;

};

struct blkif_common_response {

        char dummy;

};

/* i386 protocol version */

#pragma pack(push, 4)

struct blkif_x86_32_request {

        uint8_t        operation;    /* BLKIF_OP_???                         */

        uint8_t        nr_segments;  /* number of segments                   */

        blkif_vdev_t   handle;       /* only for read/write requests         */

        uint64_t       id;           /* private guest value, echoed in resp  */

        blkif_sector_t sector_number;/* start sector idx on disk (r/w only)  */

        struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];

};

struct blkif_x86_32_response {

        uint64_t        id;              /* copied from request */

        uint8_t         operation;       /* copied from request */

        int16_t         status;          /* BLKIF_RSP_???       */

};

typedef struct blkif_x86_32_request blkif_x86_32_request_t;

typedef struct blkif_x86_32_response blkif_x86_32_response_t;

#pragma pack(pop)

/* x86_64 protocol version */

struct blkif_x86_64_request {

        uint8_t        operation;    /* BLKIF_OP_???                         */

        uint8_t        nr_segments;  /* number of segments                   */

        blkif_vdev_t   handle;       /* only for read/write requests         */

        uint64_t       __attribute__((__aligned__(8))) id;

        blkif_sector_t sector_number;/* start sector idx on disk (r/w only)  */

        struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];

};

struct blkif_x86_64_response {

        uint64_t       __attribute__((__aligned__(8))) id;

        uint8_t         operation;       /* copied from request */

        int16_t         status;          /* BLKIF_RSP_???       */

};

typedef struct blkif_x86_64_request blkif_x86_64_request_t;

typedef struct blkif_x86_64_response blkif_x86_64_response_t;

DEFINE_RING_TYPES(blkif_common, struct blkif_common_request, struct blkif_common_response);

DEFINE_RING_TYPES(blkif_x86_32, struct blkif_x86_32_request, struct blkif_x86_32_response);

DEFINE_RING_TYPES(blkif_x86_64, struct blkif_x86_64_request, struct blkif_x86_64_response);

union blkif_back_rings {

        blkif_back_ring_t        native;

        blkif_common_back_ring_t common;

        blkif_x86_32_back_ring_t x86_32_part;

        blkif_x86_64_back_ring_t x86_64_part;

};

typedef union blkif_back_rings blkif_back_rings_t;

enum blkif_protocol {

        BLKIF_PROTOCOL_NATIVE = 1,

        BLKIF_PROTOCOL_X86_32 = 2,

        BLKIF_PROTOCOL_X86_64 = 3,

};

static inline void blkif_get_x86_32_req(blkif_request_t *dst, blkif_x86_32_request_t *src)

{

        int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;

        dst->operation = src->operation;

        dst->nr_segments = src->nr_segments;

        dst->handle = src->handle;

        dst->id = src->id;

        dst->sector_number = src->sector_number;

        if (n > src->nr_segments)

                n = src->nr_segments;

        for (i = 0; i < n; i++)

                dst->seg[i] = src->seg[i];

}

static inline void blkif_get_x86_64_req(blkif_request_t *dst, blkif_x86_64_request_t *src)

{

        int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;

        dst->operation = src->operation;

        dst->nr_segments = src->nr_segments;

        dst->handle = src->handle;

        dst->id = src->id;

        dst->sector_number = src->sector_number;

        if (n > src->nr_segments)

                n = src->nr_segments;

        for (i = 0; i < n; i++)

                dst->seg[i] = src->seg[i];

}

#endif /* __XEN_BLKIF_H__ */