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104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
#ifndef __XEN_BLKIF_H__
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#define __XEN_BLKIF_H__
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#include <xen/io/ring.h>
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#include <xen/io/blkif.h>
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#include <xen/io/protocols.h>
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/* Not a real protocol. Used to generate ring structs which contain
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* the elements common to all protocols only. This way we get a
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* compiler-checkable way to use common struct elements, so we can
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* avoid using switch(protocol) in a number of places. */
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struct blkif_common_request {
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char dummy;
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};
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struct blkif_common_response {
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char dummy;
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};
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/* i386 protocol version */
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#pragma pack(push, 4)
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struct blkif_x86_32_request {
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uint8_t operation; /* BLKIF_OP_??? */
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uint8_t nr_segments; /* number of segments */
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blkif_vdev_t handle; /* only for read/write requests */
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uint64_t id; /* private guest value, echoed in resp */
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blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
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struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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};
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struct blkif_x86_32_response {
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uint64_t id; /* copied from request */
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uint8_t operation; /* copied from request */
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int16_t status; /* BLKIF_RSP_??? */
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};
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typedef struct blkif_x86_32_request blkif_x86_32_request_t;
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typedef struct blkif_x86_32_response blkif_x86_32_response_t;
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#pragma pack(pop)
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/* x86_64 protocol version */
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struct blkif_x86_64_request {
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uint8_t operation; /* BLKIF_OP_??? */
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uint8_t nr_segments; /* number of segments */
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blkif_vdev_t handle; /* only for read/write requests */
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uint64_t __attribute__((__aligned__(8))) id;
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blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
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struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
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};
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struct blkif_x86_64_response {
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uint64_t __attribute__((__aligned__(8))) id;
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uint8_t operation; /* copied from request */
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int16_t status; /* BLKIF_RSP_??? */
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};
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typedef struct blkif_x86_64_request blkif_x86_64_request_t;
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typedef struct blkif_x86_64_response blkif_x86_64_response_t;
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DEFINE_RING_TYPES(blkif_common, struct blkif_common_request, struct blkif_common_response);
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DEFINE_RING_TYPES(blkif_x86_32, struct blkif_x86_32_request, struct blkif_x86_32_response);
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DEFINE_RING_TYPES(blkif_x86_64, struct blkif_x86_64_request, struct blkif_x86_64_response);
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union blkif_back_rings {
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blkif_back_ring_t native;
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blkif_common_back_ring_t common;
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blkif_x86_32_back_ring_t x86_32_part;
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blkif_x86_64_back_ring_t x86_64_part;
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};
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typedef union blkif_back_rings blkif_back_rings_t;
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enum blkif_protocol {
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BLKIF_PROTOCOL_NATIVE = 1,
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BLKIF_PROTOCOL_X86_32 = 2,
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BLKIF_PROTOCOL_X86_64 = 3,
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};
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static void inline blkif_get_x86_32_req(blkif_request_t *dst, blkif_x86_32_request_t *src)
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{
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int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
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dst->operation = src->operation;
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dst->nr_segments = src->nr_segments;
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dst->handle = src->handle;
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dst->id = src->id;
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dst->sector_number = src->sector_number;
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if (n > src->nr_segments)
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n = src->nr_segments;
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for (i = 0; i < n; i++)
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dst->seg[i] = src->seg[i];
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}
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static void inline blkif_get_x86_64_req(blkif_request_t *dst, blkif_x86_64_request_t *src)
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{
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int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
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dst->operation = src->operation;
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dst->nr_segments = src->nr_segments;
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dst->handle = src->handle;
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dst->id = src->id;
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dst->sector_number = src->sector_number;
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if (n > src->nr_segments)
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n = src->nr_segments;
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for (i = 0; i < n; i++)
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dst->seg[i] = src->seg[i];
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}
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#endif /* __XEN_BLKIF_H__ */
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