#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__ */