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9 * The above copyright notice and this permission notice shall be included in
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21 #ifndef __XEN_BLKIF_H__
22 #define __XEN_BLKIF_H__
24 #include <xen/interface/io/ring.h>
25 #include <xen/interface/io/blkif.h>
26 #include <xen/interface/io/protocols.h>
28 /* Not a real protocol. Used to generate ring structs which contain
29 * the elements common to all protocols only. This way we get a
30 * compiler-checkable way to use common struct elements, so we can
31 * avoid using switch(protocol) in a number of places. */
32 struct blkif_common_request {
35 struct blkif_common_response {
39 /* i386 protocol version */
41 struct blkif_x86_32_request {
42 uint8_t operation; /* BLKIF_OP_??? */
43 uint8_t nr_segments; /* number of segments */
44 blkif_vdev_t handle; /* only for read/write requests */
45 uint64_t id; /* private guest value, echoed in resp */
46 blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
47 struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
49 struct blkif_x86_32_response {
50 uint64_t id; /* copied from request */
51 uint8_t operation; /* copied from request */
52 int16_t status; /* BLKIF_RSP_??? */
54 typedef struct blkif_x86_32_request blkif_x86_32_request_t;
55 typedef struct blkif_x86_32_response blkif_x86_32_response_t;
58 /* x86_64 protocol version */
59 struct blkif_x86_64_request {
60 uint8_t operation; /* BLKIF_OP_??? */
61 uint8_t nr_segments; /* number of segments */
62 blkif_vdev_t handle; /* only for read/write requests */
63 uint64_t __attribute__((__aligned__(8))) id;
64 blkif_sector_t sector_number;/* start sector idx on disk (r/w only) */
65 struct blkif_request_segment seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
67 struct blkif_x86_64_response {
68 uint64_t __attribute__((__aligned__(8))) id;
69 uint8_t operation; /* copied from request */
70 int16_t status; /* BLKIF_RSP_??? */
72 typedef struct blkif_x86_64_request blkif_x86_64_request_t;
73 typedef struct blkif_x86_64_response blkif_x86_64_response_t;
75 DEFINE_RING_TYPES(blkif_common, struct blkif_common_request, struct blkif_common_response);
76 DEFINE_RING_TYPES(blkif_x86_32, struct blkif_x86_32_request, struct blkif_x86_32_response);
77 DEFINE_RING_TYPES(blkif_x86_64, struct blkif_x86_64_request, struct blkif_x86_64_response);
79 union blkif_back_rings {
80 struct blkif_back_ring native;
81 struct blkif_common_back_ring common;
82 struct blkif_x86_32_back_ring x86_32;
83 struct blkif_x86_64_back_ring x86_64;
87 BLKIF_PROTOCOL_NATIVE = 1,
88 BLKIF_PROTOCOL_X86_32 = 2,
89 BLKIF_PROTOCOL_X86_64 = 3,
92 static void inline blkif_get_x86_32_req(struct blkif_request *dst, struct blkif_x86_32_request *src)
94 int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
95 dst->operation = src->operation;
96 dst->nr_segments = src->nr_segments;
97 dst->handle = src->handle;
99 dst->sector_number = src->sector_number;
101 if (n > dst->nr_segments)
102 n = dst->nr_segments;
103 for (i = 0; i < n; i++)
104 dst->seg[i] = src->seg[i];
107 static void inline blkif_get_x86_64_req(struct blkif_request *dst, struct blkif_x86_64_request *src)
109 int i, n = BLKIF_MAX_SEGMENTS_PER_REQUEST;
110 dst->operation = src->operation;
111 dst->nr_segments = src->nr_segments;
112 dst->handle = src->handle;
114 dst->sector_number = src->sector_number;
116 if (n > dst->nr_segments)
117 n = dst->nr_segments;
118 for (i = 0; i < n; i++)
119 dst->seg[i] = src->seg[i];
122 #endif /* __XEN_BLKIF_H__ */