Macros
#define	xen_mb() mb()

#define	xen_rmb() rmb()

#define	xen_wmb() wmb()

#define	__RD2(_x) (((_x) & 0x00000002) ? 0x2 : ((_x) & 0x1))

#define	__RD4(_x) (((_x) & 0x0000000c) ? __RD2((_x)>>2)<<2 : __RD2(_x))

#define	__RD8(_x) (((_x) & 0x000000f0) ? __RD4((_x)>>4)<<4 : __RD4(_x))

#define	__RD16(_x) (((_x) & 0x0000ff00) ? __RD8((_x)>>8)<<8 : __RD8(_x))

#define	__RD32(_x) (((_x) & 0xffff0000) ? __RD16((_x)>>16)<<16 : __RD16(_x))

#define	__CONST_RING_SIZE(_s, _sz)

#define	__RING_SIZE(_s, _sz) (__RD32(((_sz) - (INTN)(_s)->ring + (INTN)(_s)) / sizeof((_s)->ring[0])))

#define	DEFINE_RING_TYPES(__name, __req_t, __rsp_t)

#define	SHARED_RING_INIT(_s)

#define	FRONT_RING_INIT(_r, _s, __size)

#define	BACK_RING_INIT(_r, _s, __size)

#define	RING_SIZE(_r) ((_r)->nr_ents)

#define	RING_FREE_REQUESTS(_r) (RING_SIZE(_r) - ((_r)->req_prod_pvt - (_r)->rsp_cons))

#define	RING_FULL(_r) (RING_FREE_REQUESTS(_r) == 0)

#define	RING_HAS_UNCONSUMED_RESPONSES(_r) ((_r)->sring->rsp_prod - (_r)->rsp_cons)

#define	RING_HAS_UNCONSUMED_REQUESTS(_r)

#define	RING_GET_REQUEST(_r, _idx) (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].req))

#define	RING_GET_RESPONSE(_r, _idx) (&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].rsp))

#define	RING_REQUEST_CONS_OVERFLOW(_r, _cons) (((_cons) - (_r)->rsp_prod_pvt) >= RING_SIZE(_r))

#define	RING_REQUEST_PROD_OVERFLOW(_r, _prod) (((_prod) - (_r)->rsp_prod_pvt) > RING_SIZE(_r))

#define	RING_PUSH_REQUESTS(_r)

#define	RING_PUSH_RESPONSES(_r)

#define	RING_PUSH_REQUESTS_AND_CHECK_NOTIFY(_r, _notify)

#define	RING_PUSH_RESPONSES_AND_CHECK_NOTIFY(_r, _notify)

#define	RING_FINAL_CHECK_FOR_REQUESTS(_r, _work_to_do)

#define	RING_FINAL_CHECK_FOR_RESPONSES(_r, _work_to_do)

Typedefs
typedef UINT32	RING_IDX

Macro Definition Documentation

#define __CONST_RING_SIZE	(	_s,
		_sz
	)

Value:

(__RD32(((_sz) - offsetof(struct _s##_sring, ring)) / \

sizeof(((struct _s##_sring *)0)->ring[0])))

__RD32

#define __RD32(_x)

Definition: ring.h:29

#define __RD16 ( _x ) (((_x) & 0x0000ff00) ? __RD8((_x)>>8)<<8 : __RD8(_x))

#define __RD2 ( _x ) (((_x) & 0x00000002) ? 0x2 : ((_x) & 0x1))

#define __RD32 ( _x ) (((_x) & 0xffff0000) ? __RD16((_x)>>16)<<16 : __RD16(_x))

#define __RD4 ( _x ) (((_x) & 0x0000000c) ? __RD2((_x)>>2)<<2 : __RD2(_x))

#define __RD8 ( _x ) (((_x) & 0x000000f0) ? __RD4((_x)>>4)<<4 : __RD4(_x))

#define __RING_SIZE	(	_s,
		_sz
	)	(__RD32(((_sz) - (INTN)(_s)->ring + (INTN)(_s)) / sizeof((_s)->ring[0])))

#define BACK_RING_INIT	(	_r,
		_s,
		__size
	)

Value:

do {                             \
    (_r)->rsp_prod_pvt = 0;                                             \
    (_r)->req_cons = 0;                                                 \
    (_r)->nr_ents = __RING_SIZE(_s, __size);                            \
    (_r)->sring = (_s);                                                 \
} while (0)

#define DEFINE_RING_TYPES	(	__name,
		__req_t,
		__rsp_t
	)

#define FRONT_RING_INIT	(	_r,
		_s,
		__size
	)

Value:

do {                            \
    (_r)->req_prod_pvt = 0;                                             \
    (_r)->rsp_cons = 0;                                                 \
    (_r)->nr_ents = __RING_SIZE(_s, __size);                            \
    (_r)->sring = (_s);                                                 \
} while (0)

#define RING_FINAL_CHECK_FOR_REQUESTS	(	_r,
		_work_to_do
	)

Value:

do {             \
    (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r);                   \
    if (_work_to_do) break;                                             \
    (_r)->sring->req_event = (_r)->req_cons + 1;                        \
    xen_mb();                                                           \
    (_work_to_do) = RING_HAS_UNCONSUMED_REQUESTS(_r);                   \
} while (0)

#define RING_FINAL_CHECK_FOR_RESPONSES	(	_r,
		_work_to_do
	)

Value:

do {            \
    (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r);                  \
    if (_work_to_do) break;                                             \
    (_r)->sring->rsp_event = (_r)->rsp_cons + 1;                        \
    xen_mb();                                                           \
    (_work_to_do) = RING_HAS_UNCONSUMED_RESPONSES(_r);                  \
} while (0)

#define RING_FREE_REQUESTS ( _r ) (RING_SIZE(_r) - ((_r)->req_prod_pvt - (_r)->rsp_cons))

#define RING_FULL ( _r ) (RING_FREE_REQUESTS(_r) == 0)

#define RING_GET_REQUEST	(	_r,
		_idx
	)	(&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].req))

#define RING_GET_RESPONSE	(	_r,
		_idx
	)	(&((_r)->sring->ring[((_idx) & (RING_SIZE(_r) - 1))].rsp))

#define RING_HAS_UNCONSUMED_REQUESTS ( _r )

Value:

({                             \
    UINT32 req = (_r)->sring->req_prod - (_r)->req_cons;          \
    UINT32 rsp = RING_SIZE(_r) -                                  \
        ((_r)->req_cons - (_r)->rsp_prod_pvt);                          \
    req < rsp ? req : rsp;                                              \
})

#define RING_HAS_UNCONSUMED_RESPONSES ( _r ) ((_r)->sring->rsp_prod - (_r)->rsp_cons)

#define RING_PUSH_REQUESTS ( _r )

Value:

do {                                     \
    xen_wmb(); /* back sees requests /before/ updated producer index */ \
    (_r)->sring->req_prod = (_r)->req_prod_pvt;                         \
} while (0)

#define RING_PUSH_REQUESTS_AND_CHECK_NOTIFY	(	_r,
		_notify
	)

Value:

do {           \
    RING_IDX __old = (_r)->sring->req_prod;                             \
    RING_IDX __new = (_r)->req_prod_pvt;                                \
    xen_wmb(); /* back sees requests /before/ updated producer index */ \
    (_r)->sring->req_prod = __new;                                      \
    xen_mb(); /* back sees new requests /before/ we check req_event */  \
    (_notify) = ((RING_IDX)(__new - (_r)->sring->req_event) <           \
                 (RING_IDX)(__new - __old));                            \
} while (0)

#define RING_PUSH_RESPONSES ( _r )

Value:

do {                                    \
    xen_wmb(); /* front sees resps /before/ updated producer index */   \
    (_r)->sring->rsp_prod = (_r)->rsp_prod_pvt;                         \
} while (0)

#define RING_PUSH_RESPONSES_AND_CHECK_NOTIFY	(	_r,
		_notify
	)

Value:

do {          \
    RING_IDX __old = (_r)->sring->rsp_prod;                             \
    RING_IDX __new = (_r)->rsp_prod_pvt;                                \
    xen_wmb(); /* front sees resps /before/ updated producer index */   \
    (_r)->sring->rsp_prod = __new;                                      \
    xen_mb(); /* front sees new resps /before/ we check rsp_event */    \
    (_notify) = ((RING_IDX)(__new - (_r)->sring->rsp_event) <           \
                 (RING_IDX)(__new - __old));                            \
} while (0)

#define RING_REQUEST_CONS_OVERFLOW	(	_r,
		_cons
	)	(((_cons) - (_r)->rsp_prod_pvt) >= RING_SIZE(_r))

#define RING_REQUEST_PROD_OVERFLOW	(	_r,
		_prod
	)	(((_prod) - (_r)->rsp_prod_pvt) > RING_SIZE(_r))

#define RING_SIZE ( _r ) ((_r)->nr_ents)

#define SHARED_RING_INIT ( _s )

Value:

do {                                       \
    (_s)->req_prod  = (_s)->rsp_prod  = 0;                              \
    (_s)->req_event = (_s)->rsp_event = 1;                              \
    (VOID)ZeroMem((_s)->private.pvt_pad, sizeof((_s)->private.pvt_pad)); \
    (VOID)ZeroMem((_s)->__pad, sizeof((_s)->__pad));                  \
} while(0)

#define xen_mb ( ) mb()

#define xen_rmb ( ) rmb()

#define xen_wmb ( ) wmb()

Typedef Documentation

typedef UINT32 RING_IDX

Macros

Typedefs

Macro Definition Documentation

Typedef Documentation