forked from KolibriOS/kolibrios
92 lines
2.8 KiB
C
92 lines
2.8 KiB
C
/**************************************************************************
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*
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* Copyright (C) 1999 Wittawat Yamwong
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* KEITH WHITWELL, OR ANY OTHER CONTRIBUTORS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
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* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/**
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* @file
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* Memory manager code. Primarily used by device drivers to manage texture
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* heaps, etc.
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*/
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#ifndef _U_MM_H_
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#define _U_MM_H_
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struct mem_block {
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struct mem_block *next, *prev;
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struct mem_block *next_free, *prev_free;
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struct mem_block *heap;
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int ofs,size;
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unsigned int free:1;
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unsigned int reserved:1;
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};
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/**
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* input: total size in bytes
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* return: a heap pointer if OK, NULL if error
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*/
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extern struct mem_block *u_mmInit(int ofs, int size);
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/**
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* Allocate 'size' bytes with 2^align2 bytes alignment,
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* restrict the search to free memory after 'startSearch'
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* depth and back buffers should be in different 4mb banks
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* to get better page hits if possible
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* input: size = size of block
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* align2 = 2^align2 bytes alignment
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* startSearch = linear offset from start of heap to begin search
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* return: pointer to the allocated block, 0 if error
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*/
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extern struct mem_block *u_mmAllocMem(struct mem_block *heap, int size, int align2,
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int startSearch);
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/**
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* Free block starts at offset
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* input: pointer to a block
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* return: 0 if OK, -1 if error
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*/
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extern int u_mmFreeMem(struct mem_block *b);
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/**
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* Free block starts at offset
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* input: pointer to a heap, start offset
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* return: pointer to a block
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*/
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extern struct mem_block *u_mmFindBlock(struct mem_block *heap, int start);
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/**
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* destroy MM
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*/
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extern void u_mmDestroy(struct mem_block *mmInit);
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/**
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* For debugging purposes.
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*/
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extern void u_mmDumpMemInfo(const struct mem_block *mmInit);
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#endif
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