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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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7d82410950
The current memory accessors logic is: - little endian if little_endian - native endian (i.e. no byteswap) if !little_endian If we want to fully support cross-endian vhost, we also need to be able to convert to big endian. Instead of changing the little_endian argument to some 3-value enum, this patch changes the logic to: - little endian if little_endian - big endian if !little_endian The native endian case is handled by all users with a trivial helper. This patch doesn't change any functionality, nor it does add overhead. Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
64 lines
1.4 KiB
C
64 lines
1.4 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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static inline bool virtio_legacy_is_little_endian(void)
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{
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#ifdef __LITTLE_ENDIAN
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return true;
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#else
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return false;
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#endif
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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 be16_to_cpu((__force __be16)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)cpu_to_be16(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 be32_to_cpu((__force __be32)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)cpu_to_be32(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 be64_to_cpu((__force __be64)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)cpu_to_be64(val);
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}
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#endif /* _LINUX_VIRTIO_BYTEORDER */
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