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(I'm so sorry!) Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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C
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#include <linux/bits.h>#include <linux/bug.h>#include <linux/string.h>
#define VIRTIO_FEATURES_U64S 2#define VIRTIO_FEATURES_BITS (VIRTIO_FEATURES_U64S * 64)
#define VIRTIO_BIT(b) BIT_ULL((b) & 0x3f)#define VIRTIO_U64(b) ((b) >> 6)
#define VIRTIO_DECLARE_FEATURES(name) \ union { \ u64 name; \ u64 name##_array[VIRTIO_FEATURES_U64S];\ }
static inline bool virtio_features_chk_bit(unsigned int bit){ if (__builtin_constant_p(bit)) { /* * Don't care returning the correct value: the build * will fail before any bad features access */ BUILD_BUG_ON(bit >= VIRTIO_FEATURES_BITS); } else { if (WARN_ON_ONCE(bit >= VIRTIO_FEATURES_BITS)) return false; } return true;}
static inline bool virtio_features_test_bit(const u64 *features, unsigned int bit){ return virtio_features_chk_bit(bit) && !!(features[VIRTIO_U64(bit)] & VIRTIO_BIT(bit));}
static inline void virtio_features_set_bit(u64 *features, unsigned int bit){ if (virtio_features_chk_bit(bit)) features[VIRTIO_U64(bit)] |= VIRTIO_BIT(bit);}
static inline void virtio_features_clear_bit(u64 *features, unsigned int bit){ if (virtio_features_chk_bit(bit)) features[VIRTIO_U64(bit)] &= ~VIRTIO_BIT(bit);}
static inline void virtio_features_zero(u64 *features){ memset(features, 0, sizeof(features[0]) * VIRTIO_FEATURES_U64S);}
static inline void virtio_features_from_u64(u64 *features, u64 from){ virtio_features_zero(features); features[0] = from;}
static inline bool virtio_features_equal(const u64 *f1, const u64 *f2){ int i;
for (i = 0; i < VIRTIO_FEATURES_U64S; ++i) if (f1[i] != f2[i]) return false; return true;}
static inline void virtio_features_copy(u64 *to, const u64 *from){ memcpy(to, from, sizeof(to[0]) * VIRTIO_FEATURES_U64S);}
static inline void virtio_features_andnot(u64 *to, const u64 *f1, const u64 *f2){ int i;
for (i = 0; i < VIRTIO_FEATURES_U64S; i++) to[i] = f1[i] & ~f2[i];}
#endif