mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-26 06:04:14 +08:00
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
|
|
#define _LINUX_VIRTIO_BYTEORDER_H
|
|
#include <linux/types.h>
|
|
#include <uapi/linux/virtio_types.h>
|
|
|
|
static inline bool virtio_legacy_is_little_endian(void)
|
|
{
|
|
#ifdef __LITTLE_ENDIAN
|
|
return true;
|
|
#else
|
|
return false;
|
|
#endif
|
|
}
|
|
|
|
static inline u16 __virtio16_to_cpu(bool little_endian, __virtio16 val)
|
|
{
|
|
if (little_endian)
|
|
return le16_to_cpu((__force __le16)val);
|
|
else
|
|
return be16_to_cpu((__force __be16)val);
|
|
}
|
|
|
|
static inline __virtio16 __cpu_to_virtio16(bool little_endian, u16 val)
|
|
{
|
|
if (little_endian)
|
|
return (__force __virtio16)cpu_to_le16(val);
|
|
else
|
|
return (__force __virtio16)cpu_to_be16(val);
|
|
}
|
|
|
|
static inline u32 __virtio32_to_cpu(bool little_endian, __virtio32 val)
|
|
{
|
|
if (little_endian)
|
|
return le32_to_cpu((__force __le32)val);
|
|
else
|
|
return be32_to_cpu((__force __be32)val);
|
|
}
|
|
|
|
static inline __virtio32 __cpu_to_virtio32(bool little_endian, u32 val)
|
|
{
|
|
if (little_endian)
|
|
return (__force __virtio32)cpu_to_le32(val);
|
|
else
|
|
return (__force __virtio32)cpu_to_be32(val);
|
|
}
|
|
|
|
static inline u64 __virtio64_to_cpu(bool little_endian, __virtio64 val)
|
|
{
|
|
if (little_endian)
|
|
return le64_to_cpu((__force __le64)val);
|
|
else
|
|
return be64_to_cpu((__force __be64)val);
|
|
}
|
|
|
|
static inline __virtio64 __cpu_to_virtio64(bool little_endian, u64 val)
|
|
{
|
|
if (little_endian)
|
|
return (__force __virtio64)cpu_to_le64(val);
|
|
else
|
|
return (__force __virtio64)cpu_to_be64(val);
|
|
}
|
|
|
|
#endif /* _LINUX_VIRTIO_BYTEORDER */
|