projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 2d7ce0e8 MT |
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 | */ | |
| 12 | static 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 | */ | |
| 23 | static 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 | */ | |
| 34 | static inline void __virtio_clear_bit(struct virtio_device *vdev, | |
| 35 | unsigned int fbit) | |
| 36 | { | |
| 37 | vdev->features &= ~(1ULL << fbit); | |
| 38 | } | |
| 61d0b5a4 RR |
39 | |
| 40 | #define virtio_has_feature(dev, feature) \ | |
| e16e12be | 41 | (__virtio_test_bit((dev), feature)) |
| 61d0b5a4 | 42 | |
| 6be3ffaa MT |
43 | /** |
| 44 | * virtio_has_iommu_quirk - determine whether this device has the iommu quirk | |
| 45 | * @vdev: the device | |
| 46 | */ | |
| 47 | static inline bool virtio_has_iommu_quirk(const struct virtio_device *vdev) | |
| 48 | { | |
| 49 | /* | |
| 50 | * Note the reverse polarity of the quirk feature (compared to most | |
| 51 | * other features), this is for compatibility with legacy systems. | |
| 52 | */ | |
| 53 | return !virtio_has_feature(vdev, VIRTIO_F_IOMMU_PLATFORM); | |
| 54 | } | |
| 55 | ||
| 55564a02 MT |
56 | static inline bool virtio_is_little_endian(struct virtio_device *vdev) |
| 57 | { | |
| 58 | return virtio_has_feature(vdev, VIRTIO_F_VERSION_1) || | |
| 59 | virtio_legacy_is_little_endian(); | |
| 60 | } | |
| 61 | ||
| 62 | /* Memory accessors */ | |
| 2d7ce0e8 MT |
63 | static inline u16 virtio16_to_cpu(struct virtio_device *vdev, __virtio16 val) |
| 64 | { | |
| 55564a02 | 65 | return __virtio16_to_cpu(virtio_is_little_endian(vdev), val); |
| 2d7ce0e8 MT |
66 | } |
| 67 | ||
| 68 | static inline __virtio16 cpu_to_virtio16(struct virtio_device *vdev, u16 val) | |
| 69 | { | |
| 55564a02 | 70 | return __cpu_to_virtio16(virtio_is_little_endian(vdev), val); |
| 2d7ce0e8 MT |
71 | } |
| 72 | ||
| 73 | static inline u32 virtio32_to_cpu(struct virtio_device *vdev, __virtio32 val) | |
| 74 | { | |
| 55564a02 | 75 | return __virtio32_to_cpu(virtio_is_little_endian(vdev), val); |
| 2d7ce0e8 MT |
76 | } |
| 77 | ||
| 78 | static inline __virtio32 cpu_to_virtio32(struct virtio_device *vdev, u32 val) | |
| 79 | { | |
| 55564a02 | 80 | return __cpu_to_virtio32(virtio_is_little_endian(vdev), val); |
| 2d7ce0e8 MT |
81 | } |
| 82 | ||
| 83 | static inline u64 virtio64_to_cpu(struct virtio_device *vdev, __virtio64 val) | |
| 84 | { | |
| 55564a02 | 85 | return __virtio64_to_cpu(virtio_is_little_endian(vdev), val); |
| 2d7ce0e8 MT |
86 | } |
| 87 | ||
| 88 | static inline __virtio64 cpu_to_virtio64(struct virtio_device *vdev, u64 val) | |
| 89 | { | |
| 55564a02 | 90 | return __cpu_to_virtio64(virtio_is_little_endian(vdev), val); |
| 2d7ce0e8 | 91 | } |