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EPOS

Experimental Protected-mode Operating System

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

FILE:          specmem.c
DESCRIPTION:   Services for accessing special memory areas
 
Note this should not be used directly any more (deprecated).
Client processes should use "kernel\service\mem\mem.c" instead.
 
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.
*/


// Defaults
//
#define SMHANDLE unsigned long
#define SMSTATE  unsigned char

#define SM_ST_OK        0
#define SM_ST_OUTOFRES  1
#define SM_ST_INVPARAM  2

#define SM_MAX_AREA_CNT 200

// Data structures
//
struct SMArea{
    unsigned long dwStart;
    unsigned long dwEnd;
    SMHANDLE hAreahandle;
    SMSTATE st;
};

struct SMHandle{
    SMHANDLE hAreahandle;
    SMSTATE st;
};

struct SMTransfer{
    SMHANDLE hAreahandle;
    unsigned long dwOfs;
    unsigned char bByte;
    SMSTATE st;
};

// Kernel internals
//
void k_smInit();

// These should also be for kernal use only
//
void smLockArea(struct SMArea*p);
void smFreeArea(struct SMHandle*p);
void smPutb(struct SMTransfer*p);
void smGetb(struct SMTransfer*p);