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eef960a043
virtio 1.0 makes all memory structures LE, so we need APIs to conditionally do a byteswap on BE architectures. To make it easier to check code statically, add virtio specific types for multi-byte integers in memory. Add low level wrappers that do a byteswap conditionally, these will be useful e.g. for vhost. Add high level wrappers that query device endian-ness and act accordingly. Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
#ifndef _LINUX_VIRTIO_BYTEORDER_H
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#define _LINUX_VIRTIO_BYTEORDER_H
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#include <linux/types.h>
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#include <uapi/linux/virtio_types.h>
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/*
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* Low-level memory accessors for handling virtio in modern little endian and in
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* compatibility native endian format.
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*/
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static inline u16 __virtio16_to_cpu(bool little_endian, __virtio16 val)
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{
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if (little_endian)
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return le16_to_cpu((__force __le16)val);
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else
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return (__force u16)val;
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}
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static inline __virtio16 __cpu_to_virtio16(bool little_endian, u16 val)
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{
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if (little_endian)
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return (__force __virtio16)cpu_to_le16(val);
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else
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return (__force __virtio16)val;
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}
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static inline u32 __virtio32_to_cpu(bool little_endian, __virtio32 val)
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{
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if (little_endian)
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return le32_to_cpu((__force __le32)val);
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else
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return (__force u32)val;
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}
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static inline __virtio32 __cpu_to_virtio32(bool little_endian, u32 val)
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{
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if (little_endian)
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return (__force __virtio32)cpu_to_le32(val);
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else
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return (__force __virtio32)val;
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}
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static inline u64 __virtio64_to_cpu(bool little_endian, __virtio64 val)
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{
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if (little_endian)
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return le64_to_cpu((__force __le64)val);
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else
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return (__force u64)val;
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}
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static inline __virtio64 __cpu_to_virtio64(bool little_endian, u64 val)
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{
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if (little_endian)
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return (__force __virtio64)cpu_to_le64(val);
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else
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return (__force __virtio64)val;
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}
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#endif /* _LINUX_VIRTIO_BYTEORDER */
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