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EPOS

Experimental Protected-mode Operating System

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

FILE:         access.h
DESCRIPTION:  Low-level operatins for IA332 processors ( C interface )
 
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 ACCESS_H
#define ACCESS_H

// Acessing the "ancestor" process ( the initialization process )
//
unsigned short  access_get_bootup_medium();
unsigned short  access_get_ancestor_start_seg();
unsigned short  access_get_ancestor_start_ofs();
unsigned short  access_get_ancestor_end_seg();
unsigned short  access_get_ancestor_end_ofs();

// Getting the OS Version
//
char*          access_get_name();
unsigned short access_get_major();
unsigned short access_get_minor();
unsigned short access_get_build();

// Accessing ports
//
unsigned char access_in(unsigned short port);
void access_out(unsigned short port, unsigned char data);

// Special processor registers
//
unsigned short access_cs();
unsigned short access_ss();
unsigned long  access_esp();

// Paging registers
//
void access_enablePaging();
void access_loadPDBR(unsigned long dwBase);

// Processor registers
//
typedef struct{
    unsigned short ax;
    unsigned short bx;
    unsigned short cx;
    unsigned short dx;
    unsigned short si;
    unsigned short di;
    unsigned short bp;
    unsigned short ds;
    unsigned short es;
    char nInt;
}RMREGS;

RMREGS* access_getprmregs();
void access_bios();

#define access_sti __asm__ __volatile__ ("sti\n" : : )
#define access_cli __asm__ __volatile__ ("cli\n" : : )

#endif //#ifndef ACCESS_H