Commit 6cf1398b authored by Juergen Gross's avatar Juergen Gross Committed by Jan Beulich

xen/public: add new macro to ring.h

For the initialization of a ring page by the frontend two macros are
available in ring.h: SHARED_RING_INIT() and FRONT_RING_INIT().

All known users use always both of them in direct sequence.

Add another macro XEN_FRONT_RING_INIT() combining the two macros.
Signed-off-by: default avatarJuergen Gross <jgross@suse.com>
Reviewed-by: default avatarJan Beulich <jbeulich@suse.com>
parent da28439b
......@@ -95,9 +95,8 @@ typedef unsigned int RING_IDX;
* of the shared memory area (PAGE_SIZE, for instance). To initialise
* the front half:
*
* mytag_front_ring_t front_ring;
* SHARED_RING_INIT((mytag_sring_t *)shared_page);
* FRONT_RING_INIT(&front_ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
* mytag_front_ring_t ring;
* XEN_FRONT_RING_INIT(&ring, (mytag_sring_t *)shared_page, PAGE_SIZE);
*
* Initializing the back follows similarly (note that only the front
* initializes the shared ring):
......@@ -184,6 +183,11 @@ typedef struct __name##_back_ring __name##_back_ring_t
#define FRONT_RING_INIT(_r, _s, __size) FRONT_RING_ATTACH(_r, _s, 0, __size)
#define XEN_FRONT_RING_INIT(r, s, size) do { \
SHARED_RING_INIT(s); \
FRONT_RING_INIT(r, s, size); \
} while (0)
#define BACK_RING_ATTACH(_r, _s, _i, __size) do { \
(_r)->rsp_prod_pvt = (_i); \
(_r)->req_cons = (_i); \
......
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