3 #include <linux/scatterlist.h>
4 #include <linux/kernel.h>
6 /* TODO: empty stubs for now. Broken but enough for virtio_ring.c */
7 #define list_add_tail(a, b) do {} while (0)
8 #define list_del(a) do {} while (0)
10 #define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
11 #define BITS_PER_BYTE 8
12 #define BITS_PER_LONG (sizeof(long) * BITS_PER_BYTE)
13 #define BIT_MASK(nr) (1UL << ((nr) % BITS_PER_LONG))
15 /* TODO: Not atomic as it should be:
16 * we don't use this for anything important. */
17 static inline void clear_bit(int nr, volatile unsigned long *addr)
19 unsigned long mask = BIT_MASK(nr);
20 unsigned long *p = ((unsigned long *)addr) + BIT_WORD(nr);
25 static inline int test_bit(int nr, const volatile unsigned long *addr)
27 return 1UL & (addr[BIT_WORD(nr)] >> (nr & (BITS_PER_LONG-1)));
31 struct virtio_device {
33 unsigned long features[1];
37 /* TODO: commented as list macros are empty stubs for now.
38 * Broken but enough for virtio_ring.c
39 * struct list_head list; */
40 void (*callback)(struct virtqueue *vq);
42 struct virtio_device *vdev;
44 unsigned int num_free;
48 #define MODULE_LICENSE(__MODULE_LICENSE_value) \
49 const char *__MODULE_LICENSE_name = __MODULE_LICENSE_value
51 /* Interfaces exported by virtio_ring. */
52 int virtqueue_add_sgs(struct virtqueue *vq,
53 struct scatterlist *sgs[],
59 int virtqueue_add_outbuf(struct virtqueue *vq,
60 struct scatterlist sg[], unsigned int num,
64 int virtqueue_add_inbuf(struct virtqueue *vq,
65 struct scatterlist sg[], unsigned int num,
69 void virtqueue_kick(struct virtqueue *vq);
71 void *virtqueue_get_buf(struct virtqueue *vq, unsigned int *len);
73 void virtqueue_disable_cb(struct virtqueue *vq);
75 bool virtqueue_enable_cb(struct virtqueue *vq);
76 bool virtqueue_enable_cb_delayed(struct virtqueue *vq);
78 void *virtqueue_detach_unused_buf(struct virtqueue *vq);
79 struct virtqueue *vring_new_virtqueue(unsigned int index,
81 unsigned int vring_align,
82 struct virtio_device *vdev,
85 void (*notify)(struct virtqueue *vq),
86 void (*callback)(struct virtqueue *vq),
88 void vring_del_virtqueue(struct virtqueue *vq);