1 /* 2 Copyright (C) 1996-1997 Id Software, Inc. 3 4 This program is free software; you can redistribute it and/or 5 modify it under the terms of the GNU General Public License 6 as published by the Free Software Foundation; either version 2 7 of the License, or (at your option) any later version. 8 9 This program is distributed in the hope that it will be useful, 10 but WITHOUT ANY WARRANTY; without even the implied warranty of 11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 12 13 See the GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program; if not, write to the Free Software 17 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 18 19 */ 20 /* 21 memory allocation 22 23 24 H_??? The hunk manages the entire memory block given to quake. It must be 25 contiguous. Memory can be allocated from either the low or high end in a 26 stack fashion. The only way memory is released is by resetting one of the 27 pointers. 28 29 Hunk allocations should be given a name, so the Hunk_Print () function 30 can display usage. 31 32 Hunk allocations are guaranteed to be 16 byte aligned. 33 34 The video buffers are allocated high to avoid leaving a hole underneath 35 server allocations when changing to a higher video mode. 36 37 38 Z_??? Zone memory functions used for small, dynamic allocations like text 39 strings from command input. There is only about 48K for it, allocated at 40 the very bottom of the hunk. 41 42 Cache_??? Cache memory is for objects that can be dynamically loaded and 43 can usefully stay persistant between levels. The size of the cache 44 fluctuates from level to level. 45 46 To allocate a cachable object 47 48 49 Temp_??? Temp memory is used for file loading and surface caching. The size 50 of the cache memory is adjusted so that there is a minimum of 512k remaining 51 for temp memory. 52 53 54 ------ Top of Memory ------- 55 56 high hunk allocations 57 58 <--- high hunk reset point held by vid 59 60 video buffer 61 62 z buffer 63 64 surface cache 65 66 <--- high hunk used 67 68 cachable memory 69 70 <--- low hunk used 71 72 client and server low hunk allocations 73 74 <-- low hunk reset point held by host 75 76 startup hunk allocations 77 78 Zone block 79 80 ----- Bottom of Memory ----- 81 82 83 84 */ 85 86 void Memory_Init (void *buf, int size); 87 88 void Z_Free (void *ptr); 89 void *Z_Malloc (int size); // returns 0 filled memory 90 void *Z_TagMalloc (int size, int tag); 91 92 void Z_DumpHeap (void); 93 void Z_CheckHeap (void); 94 int Z_FreeMemory (void); 95 96 void *Hunk_Alloc (int size); // returns 0 filled memory 97 void *Hunk_AllocName (int size, const char *name); 98 99 void *Hunk_HighAllocName (int size, const char *name); 100 101 int Hunk_LowMark (void); 102 void Hunk_FreeToLowMark (int mark); 103 104 int Hunk_HighMark (void); 105 void Hunk_FreeToHighMark (int mark); 106 107 void *Hunk_TempAlloc (int size); 108 109 void Hunk_Check (void); 110 111 typedef struct cache_user_s 112 { 113 void *data; 114 } cache_user_t; 115 116 void Cache_Flush (void); 117 118 void *Cache_Check (cache_user_t *c); 119 // returns the cached data, and moves to the head of the LRU list 120 // if present, otherwise returns NULL 121 122 void Cache_Free (cache_user_t *c); 123 124 void *Cache_Alloc (cache_user_t *c, int size, const char *name); 125 // Returns NULL if all purgable data was tossed and there still 126 // wasn't enough room. 127 128 void Cache_Report (void); 129 130 131 132
