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/*
*
* Copyright (c) 2018 Huawei Technologies Co.,Ltd.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef _DMM_SHARE_H_
#define _DMM_SHARE_H_
#define DMM_SHARE_PATH_MAX 100
enum dmm_share_type
{
DMM_SHARE_HEAP,
DMM_SHARE_FSHM,
DMM_SHARE_HUGE,
DMM_SHARE_ANY = -1
};
struct dmm_share
{
int type; /* share type enum dmm_share_type */
pid_t pid; /* owner/creator pid */
void *base; /* base logical address */
size_t size; /* memory size */
char path[DMM_SHARE_PATH_MAX]; /* share path */
};
int dmm_heap_create (struct dmm_share *share);
int dmm_heap_delete (struct dmm_share *share);
int dmm_heap_attach (struct dmm_share *share);
int dmm_heap_detach (struct dmm_share *share);
int dmm_fshm_create (struct dmm_share *share);
int dmm_fshm_delete (struct dmm_share *share);
int dmm_fshm_attach (struct dmm_share *share);
int dmm_fshm_detach (struct dmm_share *share);
int dmm_huge_create (struct dmm_share *share);
int dmm_huge_delete (struct dmm_share *share);
int dmm_huge_attach (struct dmm_share *share);
int dmm_huge_detach (struct dmm_share *share);
#define DMM_SHARE_DISPATCH(share, action) \
({ \
int _r; \
switch (share->type) \
{ \
case DMM_SHARE_HEAP: \
_r = dmm_heap_##action(share); \
break; \
case DMM_SHARE_FSHM: \
_r = dmm_fshm_##action(share); \
break; \
case DMM_SHARE_HUGE: \
_r = dmm_huge_##action(share); \
break; \
default: \
_r = -1; \
} \
_r; \
})
/* create share memory
input: share->type, share->size, share->pid
output: share->base, share->path
*/
inline static int
dmm_share_create (struct dmm_share *share)
{
return DMM_SHARE_DISPATCH (share, create);
}
/* delete share memory
input: share->type, share->base, share->size, share->path
*/
inline static int
dmm_share_delete (struct dmm_share *share)
{
return DMM_SHARE_DISPATCH (share, delete);
}
/* attach share memory
input: share->type share->path [share->size] [share->base]
output: share->base, share->size
*/
inline static int
dmm_share_attach (struct dmm_share *share)
{
return DMM_SHARE_DISPATCH (share, attach);
}
/* attach share memory
input: share->type share->size share->base
*/
inline static int
dmm_share_detach (struct dmm_share *share)
{
return DMM_SHARE_DISPATCH (share, detach);
}
#undef DMM_SHARE_DISPATCH
#endif /* #ifndef _DMM_SHARE_H_ */
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