1 /* 2 * Copyright (C) 2008 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef bbs_MEM_SEG_EM_H 18 #define bbs_MEM_SEG_EM_H 19 20 /* ---- includes ----------------------------------------------------------- */ 21 22 #include "b_BasicEm/Basic.h" 23 #include "b_BasicEm/DynMemManager.h" 24 25 /* ---- related objects --------------------------------------------------- */ 26 27 struct bbs_Context; 28 29 /* ---- typedefs ----------------------------------------------------------- */ 30 31 /* ---- constants ---------------------------------------------------------- */ 32 33 /* overhead memory needed for each memory block allocated (exclusive memory only) */ 34 #define bbs_MEM_BLOCK_OVERHD 2 35 36 /* Segment IDs */ 37 #define bbs_SEG_DEFAULT 0 38 39 #if defined( HW_TMS320C5x ) || defined( HW_MeP ) || defined( bbs_MEP_MEM_CONFIG ) 40 #define bbs_SEG_DA 1 41 #define bbs_SEG_DA_ALT 2 42 #define bbs_SEG_SA 3 43 #define bbs_SEG_SA_ALT 4 44 #define bbs_SEG_EXT 5 45 #define bbs_SEG_EXT_ALT 6 46 #elif defined ( bbs_KD_MEM_CONFIG ) || defined ( HW_KD_EASYSHARE ) 47 /* on-chip optimization for Kodak Easyshare project */ 48 #define bbs_SEG_DA 1 /* = internal RAM segment */ 49 #define bbs_SEG_DA_ALT 0 50 #define bbs_SEG_SA 0 51 #define bbs_SEG_SA_ALT 0 52 #define bbs_SEG_EXT 0 53 #define bbs_SEG_EXT_ALT 0 54 #endif 55 56 /* ---- object definition -------------------------------------------------- */ 57 58 /** Descriptor of a coherent memory segment available for memory management. 59 * How management works 60 * - Memory is arranged in blocks 61 * - Each block refers to a single call of function alloc() 62 * - Each block is aligned at 32bit 63 * - The size of each block is even (32bit aligned size) 64 * Uique (non-shared) segments: 65 * - Each block has a preceding 32 bit value indication its length 66 * - Function free() marks the corresponding block 'unused' and 67 * removes subsequently any unused block at the last position of allocated memory 68 * Shared segments: 69 * - No write access to memory block by function alloc() 70 * - Function free has no effect 71 * Identifier: 72 * - Each segment contains an ID. The segment with the ID 0 is the default segment. 73 */ 74 struct bbs_MemSeg 75 { 76 /* all member variables are considered read only. Only change them through functions */ 77 78 /** pointer to memory */ 79 uint16* memPtrE; 80 81 /** size of memory segment in 16 bit units */ 82 uint32 sizeE; 83 84 /** current allocation index in 16 bit units (index is always even -> 32 bit alignment enforced) */ 85 uint32 allocIndexE; 86 87 /** Indicates that this isegment is to be shared among multiple objects */ 88 flag sharedE; 89 90 /** ID of segment, id=0: unspecified */ 91 uint32 idE; 92 93 /** pointer to external memory manager */ 94 struct bbs_DynMemManager* dynMemManagerPtrE; 95 }; 96 97 /* ---- associated objects ------------------------------------------------- */ 98 99 /* ---- external functions ------------------------------------------------- */ 100 101 /* ---- \ghd{ constructor/destructor } ------------------------------------- */ 102 103 /** initializes bbs_MemSeg */ 104 void bbs_MemSeg_init( struct bbs_Context* cpA, 105 struct bbs_MemSeg* ptrA ); 106 107 /** resets bbs_MemSeg */ 108 void bbs_MemSeg_exit( struct bbs_Context* cpA, 109 struct bbs_MemSeg* ptrA ); 110 111 /* ---- \ghd{ operators } -------------------------------------------------- */ 112 113 /* ---- \ghd{ query functions } -------------------------------------------- */ 114 115 /** returns available 16bit units of memeory in given segment; (allocation is always 32 bit aligned) */ 116 uint32 bbs_MemSeg_availableSize( struct bbs_Context* cpA, 117 const struct bbs_MemSeg* ptrA ); 118 119 /** returns currently allocated size in 16bit units of memeory in given segment */ 120 uint32 bbs_MemSeg_allocatedSize( struct bbs_Context* cpA, 121 const struct bbs_MemSeg* ptrA ); 122 123 /** returns effectively used memory amount allocated size - unused blocks - overhead */ 124 uint32 bbs_MemSeg_usedSize( struct bbs_Context* cpA, 125 const struct bbs_MemSeg* ptrA ); 126 127 /** counts amount of memory blocks allocated */ 128 uint32 bbs_MemSeg_blocks( struct bbs_Context* cpA, 129 const struct bbs_MemSeg* ptrA ); 130 131 /** counts amount of memory blocks currently used */ 132 uint32 bbs_MemSeg_usedBlocks( struct bbs_Context* cpA, 133 const struct bbs_MemSeg* ptrA ); 134 135 /* ---- \ghd{ modify functions } ------------------------------------------- */ 136 137 /* ---- \ghd{ memory I/O } ------------------------------------------------- */ 138 139 /* ---- \ghd{ exec functions } --------------------------------------------- */ 140 141 /** creation of a exclusive memory segment; memPtrA must be 32-bit aligned */ 142 struct bbs_MemSeg bbs_MemSeg_create( struct bbs_Context* cpA, 143 void* memPtrA, 144 uint32 sizeA ); 145 146 /** creation of a shared memory segment; memPtrA must be 32-bit aligned */ 147 struct bbs_MemSeg bbs_MemSeg_createShared( struct bbs_Context* cpA, 148 void* memPtrA, 149 uint32 sizeA ); 150 151 /** allocation of memory (very fast); sizeA specifies number of 16bit units; (allocation is always 32 bit aligned) */ 152 void* bbs_MemSeg_alloc( struct bbs_Context* cpA, 153 struct bbs_MemSeg* ptrA, 154 uint32 sizeA ); 155 156 /** Frees allocated memory 157 * If segment is shared, ptrA == NULL or memPtrA == NULL, nothing happens 158 */ 159 void bbs_MemSeg_free( struct bbs_Context* cpA, 160 struct bbs_MemSeg* ptrA, 161 void* memPtrA ); 162 163 /** checks consistency of memory */ 164 void bbs_MemSeg_checkConsistency( struct bbs_Context* cpA, 165 const struct bbs_MemSeg* ptrA ); 166 167 #endif /* bbs_MEM_SEG_EM_H */ 168 169
