Category : Alternate Operating Systems - Quarterdeck DesqView, CP/M, etc
Archive   : PCCAPP.ZIP
Filename : PCCONFIG.H

/*
* This file is part of the Choices Operating System
* Developed by: The TAPESTRY Parallel Computing Laboratory
* University of Illinois at Urbana-Champaign
* Department of Computer Science
* 1304 W. Springfield Ave.
* Urbana, IL 61801
*
* Copyright (c) 1987, 1988, 1989, 1990, 1991, 1992
* The University of Illinois Board of Trustees.
* All Rights Reserved.
* Distribution restricted under license agreement.
*
* Author: Lee Lup Yuen ([email protected])
* Project Manager and Principal Investigator: Roy Campbell ([email protected])
*
* Funded by: NSF TAPESTRY Grant No. 1-5-30035, NASA ICLASS Grant
* No. 1-5-25469 and No. NSG1471 and AT&T Metronet Grant No. 1-5-37411.
*/
/*
* PCConfiguration.h: PC configuration information. This file is shared by
* the PC-Choices kernel and loadcoff.
*
*/

#ifndef PCConfiguration_h
#define PCConfiguration_h
#ifdef __GNUG__
#pragma once
#pragma interface
#endif

// This file is shared by the PC-Choices kernel and loadcoff. If you change
// anything in this file, you must recompile both programs.

// CAUTION: This file is to be compiled by both g++ and Turbo C++.
// g++ will align structure members that are words and double-words,
// conflicting with the layout produced by Turbo C++. Therefore, in
// any structure declared in this file, double-word members MUST ALWAYS
// be defined before the word members, which MUST ALWAYS be defined
// before the byte members. This causes both compilers to produce the same
// layout even with alignment.

// uint16 is an unsigned int of 16 bits, uint32 is an unsigned int of 32 bits.

#ifdef __MSDOS__
typedef unsigned int uint16;
typedef unsigned long uint32;
#else
typedef unsigned short uint16;
typedef unsigned int uint32;
#endif

struct PCConfiguration
{
// This struct is used by loadcoff to pass configuration information
// about the PC to the PC-Choices kernel. The fields below whose names
// begin with lowercase letters are automatically configured by
// loadcoff; the rest are set according to the configuration
// file read by loadcoff.

// REMEMBER: Always put double-word members before word members and
// put word members before byte members. See note above on alignment.

// Amount of kernel working memory to be allocated, in Kb.
uint32 KernelWorkingMemorySize;

// Address to branch to when PC-Choices wants to return to real mode.
uint32 choicesReturn;

// Starting address of memory to be preserved so that choicesReturn
// will work.
uint32 choicesReturnArea;

// Size of memory starting at choicesReturnArea to be preserved so that
// choicesReturn will work.
uint32 choicesReturnSize;

// Base address of VirtualPC task area.
uint32 virtualPCTaskBase;

// Top address of VirtualPC task area + 1.
uint32 virtualPCTaskBound;

// Base address of VirtualPC buffer area.
uint32 virtualPCBufferBase;

// Top address of VirtualPC buffer area + 1.
uint32 virtualPCBufferBound;

// Extended memory in Kb.
uint16 extendedMemorySize;

// Program segment prefix of this DOS process.
uint16 psp;

// Store the interrupt masks for the interrupt controllers. These
// masks will be restored when we return to DOS.
unsigned char interruptMask1, interruptMask2;

// True if memory allocation should be displayed.
unsigned char DisplayMemoryAllocation;

// True if PS/2 keyboard-handling should be used.
unsigned char PS2Keyboard;

// True if PS/2 timer-handling should be used.
unsigned char PS2Timer;

// Entry N is true if IRQ N should be enabled. IRQ0 is always enabled,
// since it's the timer.
unsigned char IRQEnabled [16];

// A copy of all the PC interrupt vectors, to be restored later.
unsigned char interruptVectors [1024];
};

// Pointer to the actual struct. Defined in PCKernel.cc and set in boot.s.
extern PCConfiguration *ThePCConfiguration;

#endif /* PCCPUConfiguration_h */