1 /* 2 * Copyright (c) 2013-2019 Huawei Technologies Co., Ltd. All rights reserved. 3 * Copyright (c) 2020-2023 Huawei Device Co., Ltd. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without modification, 6 * are permitted provided that the following conditions are met: 7 * 8 * 1. Redistributions of source code must retain the above copyright notice, this list of 9 * conditions and the following disclaimer. 10 * 11 * 2. Redistributions in binary form must reproduce the above copyright notice, this list 12 * of conditions and the following disclaimer in the documentation and/or other materials 13 * provided with the distribution. 14 * 15 * 3. Neither the name of the copyright holder nor the names of its contributors may be used 16 * to endorse or promote products derived from this software without specific prior written 17 * permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 20 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, 21 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR 23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; 26 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR 28 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF 29 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #ifndef __LOS_SHM_PRI_H__ 33 #define __LOS_SHM_PRI_H__ 34 35 #include "los_typedef.h" 36 #include "los_vm_map.h" 37 #include "los_process_pri.h" 38 39 #ifdef __cplusplus 40 #if __cplusplus 41 extern "C" { 42 #endif /* __cplusplus */ 43 #endif /* __cplusplus */ 44 45 /* The upper limit size of total shared memory is default 16M */ 46 #define SHM_MAX_PAGES 4096 47 #define SHM_MAX (SHM_MAX_PAGES * PAGE_SIZE) 48 #define SHM_MIN 1 49 #define SHM_MNI 192 50 #define SHM_SEG 128 51 #define SHM_ALL (SHM_MAX_PAGES) 52 53 struct shmIDSource { 54 struct shmid_ds ds; 55 UINT32 status; 56 LOS_DL_LIST node; 57 #ifdef LOSCFG_SHELL 58 CHAR ownerName[OS_PCB_NAME_LEN]; 59 #endif 60 }; 61 62 VOID OsShmFork(LosVmSpace *space, LosVmMapRegion *oldRegion, LosVmMapRegion *newRegion); 63 VOID OsShmRegionFree(LosVmSpace *space, LosVmMapRegion *region); 64 BOOL OsIsShmRegion(LosVmMapRegion *region); 65 struct shmIDSource *OsShmCBInit(LosMux *sysvShmMux, struct shminfo *shmInfo, UINT32 *shmUsedPageCount); 66 VOID OsShmCBDestroy(struct shmIDSource *shmSegs, struct shminfo *shmInfo, LosMux *sysvShmMux); 67 #ifdef __cplusplus 68 #if __cplusplus 69 } 70 #endif /* __cplusplus */ 71 #endif /* __cplusplus */ 72 73 #endif /* __LOS_SHM_PRI_H__ */ 74