| #ifndef LINUX_VIRTIO_H |
| #define LINUX_VIRTIO_H |
| #include <linux/scatterlist.h> |
| #include <linux/kernel.h> |
| |
| /* 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; |
| }; |
| |
| #define MODULE_LICENSE(__MODULE_LICENSE_value) \ |
| const char *__MODULE_LICENSE_name = __MODULE_LICENSE_value |
| |
| /* 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); |
| |
| void 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, |
| void (*notify)(struct virtqueue *vq), |
| void (*callback)(struct virtqueue *vq), |
| const char *name); |
| void vring_del_virtqueue(struct virtqueue *vq); |
| |
| #endif |