#ifndef LINUX_VIRTIO_H #define LINUX_VIRTIO_H #include #include /* TODO: empty stubs for now. Broken but enough for virtio_ring.c */ #define list_add_tail(a, b) do {} while (0) #define list_del(a) do {} while (0) #define BIT_WORD(nr) ((nr) / BITS_PER_LONG) #define BITS_PER_BYTE 8 #define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE) #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG)) /* TODO: Not atomic as it should be: * we don't use this for anything important. */ static inline void clear_bit(int nr, volatile unsigned long *addr) { unsigned long mask = BIT_MASK(nr); unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr); *p &= ~mask; } static inline int test_bit(int nr, const volatile unsigned long *addr) { return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1))); } /* end of stubs */ struct virtio_device { void *dev; unsigned long features[1]; }; struct virtqueue { /* TODO: commented as list macros are empty stubs for now. * Broken but enough for virtio_ring.c * struct list_head list; */ void (*callback)(struct virtqueue *vq); const char *name; struct virtio_device *vdev; unsigned int index; unsigned int num_free; void *priv; }; /* Interfaces exported by virtio_ring. */ int virtqueue_add_sgs(struct virtqueue *vq, struct scatterlist *sgs[], unsigned int out_sgs, unsigned int in_sgs, void *data, gfp_t gfp); int virtqueue_add_outbuf(struct virtqueue *vq, struct scatterlist sg[], unsigned int num, void *data, gfp_t gfp); int virtqueue_add_inbuf(struct virtqueue *vq, struct scatterlist sg[], unsigned int num, void *data, gfp_t gfp); bool virtqueue_kick(struct virtqueue *vq); void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len); void virtqueue_disable_cb(struct virtqueue *vq); bool virtqueue_enable_cb(struct virtqueue *vq); bool virtqueue_enable_cb_delayed(struct virtqueue *vq); void *virtqueue_detach_unused_buf(struct virtqueue *vq); struct virtqueue *vring_new_virtqueue(unsigned int index, unsigned int num, unsigned int vring_align, struct virtio_device *vdev, bool weak_barriers, void *pages, bool (*notify)(struct virtqueue *vq), void (*callback)(struct virtqueue *vq), const char *name); void vring_del_virtqueue(struct virtqueue *vq); #endif