LXR linux/tools/virtio/linux/virtio

   1#include <linux/virtio_byteorder.h>
   2#include <linux/virtio.h>
   3#include <uapi/linux/virtio_config.h>
   4
   5/*
   6 * __virtio_test_bit - helper to test feature bits. For use by transports.
   7 *                     Devices should normally use virtio_has_feature,
   8 *                     which includes more checks.
   9 * @vdev: the device
  10 * @fbit: the feature bit
  11 */
  12static inline bool __virtio_test_bit(const struct virtio_device *vdev,
  13                                     unsigned int fbit)
  14{
  15        return vdev->features & (1ULL << fbit);
  16}
  17
  18/**
  19 * __virtio_set_bit - helper to set feature bits. For use by transports.
  20 * @vdev: the device
  21 * @fbit: the feature bit
  22 */
  23static inline void __virtio_set_bit(struct virtio_device *vdev,
  24                                    unsigned int fbit)
  25{
  26        vdev->features |= (1ULL << fbit);
  27}
  28
  29/**
  30 * __virtio_clear_bit - helper to clear feature bits. For use by transports.
  31 * @vdev: the device
  32 * @fbit: the feature bit
  33 */
  34static inline void __virtio_clear_bit(struct virtio_device *vdev,
  35                                      unsigned int fbit)
  36{
  37        vdev->features &= ~(1ULL << fbit);
  38}
  39
  40#define virtio_has_feature(dev, feature) \
  41        (__virtio_test_bit((dev), feature))
  42
  43static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val)
  44{
  45        return __virtio16_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
  46}
  47
  48static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val)
  49{
  50        return __cpu_to_virtio16(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
  51}
  52
  53static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val)
  54{
  55        return __virtio32_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
  56}
  57
  58static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val)
  59{
  60        return __cpu_to_virtio32(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
  61}
  62
  63static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val)
  64{
  65        return __virtio64_to_cpu(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
  66}
  67
  68static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val)
  69{
  70        return __cpu_to_virtio64(virtio_has_feature(vdev, VIRTIO_F_VERSION_1), val);
  71}
  72
  73