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EPOS

Experimental Protected-mode Operating System

memory.h
/*
EPOS
http://www.atanaslaskov.com/epos/

FILE:        memory.h
DESCRIPTION: Dynamic memory managment
 
BSD LICENSE
Copyright (c) 2006, Atanas Laskov
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
   1. Redistributions of source code must retain the above copyright notice,
   this list of conditions and the following disclaimer.
   2. Redistributions in binary form must reproduce the above copyright notice,
   this list of conditions and the following disclaimer in the documentation
   and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL ATANAS LASKOV BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


#ifndef MEMORY_H
#define MEMORY_H

// Some defaults
//
#define HMEMORY             unsigned long
#define MEMRET              unsigned char
#define MEMRET_OK           0
#define MEMRET_OUTOFMEM     1
#define MEMRET_OUTOFBLOCKS  2
#define MEMRET_INVBLOCK     3

#define PSTEP               (4*1024)
#define MEM_START           0x100000
#define MEM_MAX_BLOCK_COUNT 1024

// Memory block handler
//
struct MemBlock{
    unsigned long dwStart;
    unsigned long dwEnd;
};

// Initialize memory manager
void memInit();

// Allocate and free a block
//
MEMRET memAlloc(HMEMORY *ph, unsigned long dwBytes);
MEMRET memFree(HMEMORY h);

// Form a memory pointer from memory block handler
//
void*  memFormPointer(HMEMORY h);

// Get detailed information
MEMRET memBlockInfo(HMEMORY h, struct MemBlock *pInfo);

// Query memory status
//
unsigned long memGetFreeBlockCnt();
unsigned long memGetPhysicalMemorySize();
unsigned long memGetFreePhysicalMemorySize();


#endif //#ifndef MEMORY_H