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EPOS

Experimental Protected-mode Operating System

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

FILE:           mem.h
DESCRIPTION:    Memory management (builds on top of kernel\memory\memory.c)
 
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.
*/


// Some defaults
//
#define MAX_AREACNT_PER_PROCESS 64

#define MEMRET unsigned char
#define MEM_OK          0
#define MEM_OUT_OF_RES  1
#define MEM_OUT_OF_MEM  2
#define MEM_INVALID_MEM 3

#define MEM_SPECIAL_NO           0
#define MEM_SPECIAL_LOWMEM       1
#define MEM_SPECIAL_PROCESS_MEM  2

// Data types
//
typedef struct{
    unsigned long bRequireSpecialMemory;
    unsigned long dwSize;
    char* pMem;
    MEMRET st;
}MALLOC;

typedef struct{
    char* pMem;
    MEMRET st;
}MFREE;

typedef struct{
    char* pMem;
    unsigned long dwSize;
    MEMRET st;
}MINFO;

// Kernel internals
//
void k_memInit();
void k_memProcessIsLive(PID dwPID);

// User services
//
void mAlloc(MALLOC *ma);
void mFree(MFREE *mf);
void mInfo(MINFO *mi);