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Initial commit of Command & Conquer Red Alert source code.

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LFeenanEA
2025-02-27 16:15:05 +00:00
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WIN32LIB/SRCDEBUG/DESCMGMT.CPP Normal file
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/*
** Command & Conquer Red Alert(tm)
** Copyright 2025 Electronic Arts Inc.
**
** This program is free software: you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation, either version 3 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/***************************************************************************
** 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 **
***************************************************************************
* *
* Project Name : Descriptor management *
* *
* File Name : DESCMGMT.CPP *
* *
* Programmer : Jeff Wilson *
* *
* Start Date : March 28, 1994 *
* *
* Last Update : March 28, 1994 [] *
* *
*-------------------------------------------------------------------------*
* Functions: *
* MAP_SEGMENT_TO_ADDRESS -- Maps a physical address into a selector *
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
#include "descmgmt.h"
#include "misc.h"
/***************************************************************************
* MAP_SEGMENT_TO_ADDRESS -- Maps a physical address into a selector *
* *
* *
* *
* INPUT: *
* *
* OUTPUT: selector UWORD The selector mapped to address. exit on error. *
* *
* WARNINGS: *
* *
* HISTORY: *
* 03/25/1994 jaw: Created. *
*=========================================================================*/
ULONG Map_Segment_To_Address(ULONG address, ULONG length)
{
// this function is not longer needed by RATIONAL SYSTEM DOS4GW
// linear addressing mode.
// a> the first megabyte of memory is mapped to linear adress 0 - 0x10000h
// b> all other addresses are linear offset from either ds: or es:
/*
UWORD segment;
UWORD curDS;
CD_DES desc;
CD_DES cur_desc;
// allocate a selector
if(_dos_allocmem(0, &segment) != 0) {
Exit(1, "Allocation of Descriptor.\n");
}
// get the data for this selector
if(_dx_ldt_rd(segment, (UCHAR *)&desc) != 0) {
Exit(1, "Reading Descriptor.\n");
}
// get the data for current data segment
curDS = GetDs();
if(_dx_ldt_rd(curDS, (UCHAR *)&cur_desc) != 0) {
Exit(1, "Reading Descriptor.\n");
}
// set limit
desc.limit0_15 = (USHORT)(length & 0xffff);
desc.limit16_19 = ((UCHAR)(length >> 16L)) | DOS_32;
// set base address
desc.base0_15 = (USHORT)(address & 0xffff);
desc.base16_23 = (UCHAR)((address >> 16) & 0xff);
desc.base24_31 = (UCHAR)((address >> 24) & 0xff);
// set rights mark as icurrent data segment
desc.arights = cur_desc.arights;
// write to LDT selector
if(_dx_ldt_wr(segment, (UCHAR *)&desc) != 0) {
Exit(1, "Failed writing descriptor.\n");
}
// return selector number
return segment;
*/
if ( address & 0xfff0ffff )
Exit ( 1 , "Error mapping real address to lineal address.\n" ) ;
return address ;
}