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virtio: introduce virtio_legacy_is_cross_endian()

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This helper will be used by vhost and tap to detect cross-endianness in
the legacy virtio case.

Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Greg Kurz 2015-06-17 15:23:34 +02:00 committed by Michael S. Tsirkin
parent 332f64073b
commit 41d283bdab
1 changed files with 13 additions and 0 deletions
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13
include/hw/virtio/virtio-access.h
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@ -32,6 +32,19 @@ static inline bool virtio_access_is_big_endian(VirtIODevice *vdev)
#endif
}
static inline bool virtio_legacy_is_cross_endian(VirtIODevice *vdev)
{
#ifdef TARGET_IS_BIENDIAN
#ifdef HOST_WORDS_BIGENDIAN
return !virtio_is_big_endian(vdev);
#else
return virtio_is_big_endian(vdev);
#endif
#else
return false;
#endif
}
static inline uint16_t virtio_lduw_phys(VirtIODevice *vdev, hwaddr pa)
{
if (virtio_access_is_big_endian(vdev)) {