176 lines
6.2 KiB
C++
176 lines
6.2 KiB
C++
/*
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** Command & Conquer Red Alert(tm)
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** Copyright 2025 Electronic Arts Inc.
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**
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** This program is free software: you can redistribute it and/or modify
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** it under the terms of the GNU General Public License as published by
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** the Free Software Foundation, either version 3 of the License, or
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** (at your option) any later version.
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**
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** This program is distributed in the hope that it will be useful,
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** but WITHOUT ANY WARRANTY; without even the implied warranty of
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** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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** GNU General Public License for more details.
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**
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** You should have received a copy of the GNU General Public License
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** along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* $Header: F:\projects\c&c0\vcs\code\dpmi.h_v 4.43 05 Jul 1996 17:58:40 JOE_BOSTIC $ */
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/***********************************************************************************************
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*** C O N F I D E N T I A L --- W E S T W O O D S T U D I O S ***
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***********************************************************************************************
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* *
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* Project Name : Command & Conquer *
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* *
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* File Name : DPMI.H *
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* *
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* Programmer : Joe L. Bostic *
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* *
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* Start Date : July 2, 1994 *
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* *
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* Last Update : July 2, 1994 [JLB] *
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* *
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*---------------------------------------------------------------------------------------------*
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* Functions: *
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* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
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#ifndef DPMI_Hx
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#define DPMI_Hx
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#include <dos.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <mem.h>
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extern void output(short port, short data);
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class DOSSegmentClass {
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/*
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** This is the selector/segment value. In real mode it is the segment, in protected
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** mode it is the selector (also 16 bits). This value is moved into DS or ES when
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** accessing memory.
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** Note: in Watcom flat addressing, Selector == Segment<<4 (ex: 0A0000h)
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*/
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unsigned int Selector;
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/*
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** These are C equivalents for pushing and popping the DS segment register. By using
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** these, it is possible to create very small code that uses a segment and
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** offset without damaging the DS register. These are especially useful in protected
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** mode, but they are legal in real mode as well.
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*/
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void Push_DS(void) {/*__emit__(0x1E);*/};
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void Pop_DS(void) {/*__emit__(0x1F);*/};
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public:
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DOSSegmentClass(void);
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~DOSSegmentClass(void);
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DOSSegmentClass(unsigned short segment, long size=(1024L*64L));
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unsigned int Get_Selector(void);
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/*
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** This routine is used to assign where the descriptor actually points to in
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** low DOS memory. In real mode, this is a simple segment assignment and the size
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** is always 64K regardless of what is specified. In protected mode, the segment
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** is used to update the selector and the size can be any length.
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** In Watcom flat mode, it sets Selector == segment<<4
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*/
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void Assign(unsigned short segment, long size=(1024L*64L));
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/*
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** These routines will move the data to/from regular memory and the segment/descriptor
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** memory.
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*/
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void Copy_To(void *source, int dest, int size);
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void Copy_From(void *dest, int source, int size);
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void Copy_Word_To(short data, int dest);
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void Copy_Byte_To(char data, int dest);
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void Copy_DWord_To(long data, int dest);
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short Copy_Word_From(int source);
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char Copy_Byte_From(int source);
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long Copy_DWord_From(int source);
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/*
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** These routines move data around between sections of segmented (descriptor) memory.
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** Typically, this is used when accessing DOS memory in protected mode or when dealing
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** with hard memory areas such as the screen.
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*/
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static void Copy(DOSSegmentClass &src, int soffset, DOSSegmentClass &dest, int doffset, int size);
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static void Swap(DOSSegmentClass &src, int soffset, DOSSegmentClass &dest, int doffset, int size);
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};
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inline DOSSegmentClass::DOSSegmentClass(void)
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{
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Selector = 0xB0000;
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}
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inline DOSSegmentClass::~DOSSegmentClass(void)
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{
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}
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inline void DOSSegmentClass::Copy_Word_To(short data, int dest)
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{
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*(short *)(Selector+dest) = data;
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}
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inline void DOSSegmentClass::Copy_Byte_To(char data, int dest)
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{
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*(char *)(Selector+dest) = data;
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}
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inline void DOSSegmentClass::Copy_DWord_To(long data, int dest)
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{
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*(long *)(Selector+dest) = data;
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}
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inline void DOSSegmentClass::Assign(unsigned short segment, long)
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{
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Selector = (long)(segment)<<4L;
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}
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inline DOSSegmentClass::DOSSegmentClass(unsigned short segment, long)
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{
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Assign(segment);
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}
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inline void DOSSegmentClass::Copy_To(void *source, int dest, int size)
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{
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memmove((void*)(Selector+dest), source, (unsigned)size);
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}
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inline void DOSSegmentClass::Copy_From(void *dest, int source, int size)
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{
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memmove(dest, (void*)(Selector+source), (unsigned)size);
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}
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inline void DOSSegmentClass::Copy(DOSSegmentClass &src, int soffset, DOSSegmentClass &dest, int doffset, int size) {
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memmove((void*)(dest.Selector+doffset), (void*)(src.Selector+soffset), (unsigned)size);
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}
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inline short DOSSegmentClass::Copy_Word_From(int source)
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{
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return *(short*)(Selector+source);
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}
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inline char DOSSegmentClass::Copy_Byte_From(int source)
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{
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return *(char*)(Selector+source);
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}
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inline long DOSSegmentClass::Copy_DWord_From(int source)
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{
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return *(long*)(Selector+source);
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}
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inline unsigned int DOSSegmentClass::Get_Selector(void)
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{
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return Selector;
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}
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#endif
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