135 lines
3.3 KiB
C++
135 lines
3.3 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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/****************************************************************************
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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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*
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* FILE
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* mem.c
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*
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* DESCRIPTION
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* Memory management.
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*
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* PROGRAMMER
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* Phil Gorrow
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* Denzil E. Long, Jr.
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*
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* DATE
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* July 5, 1995
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*
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*---------------------------------------------------------------------------
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*
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* PUBLIC
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* DPMI_Lock - Lock a memory page.
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* DPMI_Unlock - Unlock a locked memory page.
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*
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****************************************************************************/
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#ifdef __WATCOMC__
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#include <dos.h>
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#include <mem.h>
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#include <vqm32\mem.h>
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/****************************************************************************
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*
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* NAME
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* DPMI_Lock - Lock a memory page.
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*
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* SYNOPSIS
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* DPMI_Lock(Address, Size)
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*
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* void DPMI_Lock(void *, long);
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*
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* FUNCTION
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*
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* INPUTS
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* Address - Starting linear address of memory to lock.
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* Size - Size of region to lock in bytes.
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*
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* RESULT
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* NONE
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*
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****************************************************************************/
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void DPMI_Lock(void const *ptr, long const size)
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{
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union REGS regs;
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struct SREGS sregs;
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memset(®s, 0, sizeof(REGS));
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segread(&sregs);
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/* Lock the memory page.
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*
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* AX = 0x600
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* BX:CX = Starting linear address of memory to lock.
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* SI:DI = Size of region to lock in bytes.
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*/
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regs.x.eax = DPMI_LOCK;
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regs.x.ebx = ((long)ptr & 0xFFFF0000) >> 16;
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regs.x.ecx = ((long)ptr & 0x0000FFFF);
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regs.x.esi = ((long)size & 0xFFFF0000) >> 16;
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regs.x.edi = ((long)size & 0x0000FFFF);
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int386x(DPMI_INT, ®s, ®s, &sregs);
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}
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/****************************************************************************
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*
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* NAME
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* DPMI_Unlock - Unlock a locked memory page.
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*
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* SYNOPSIS
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* DPMI_Unlock(Address, Size)
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*
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* void DPMI_Unlock(void *, long);
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*
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* FUNCTION
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*
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* INPUTS
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* Address - Starting linear address of memory to unlock.
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* Size - Size of region to unlock in bytes.
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*
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* RESULT
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* NONE
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*
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****************************************************************************/
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void DPMI_Unlock(void const *ptr, long const size)
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{
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union REGS regs;
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struct SREGS sregs;
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/* Unlock memory page. */
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memset(®s, 0 ,sizeof(REGS));
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segread(&sregs);
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regs.x.eax = DPMI_UNLOCK;
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regs.x.ebx = ((long)ptr & 0xFFFF0000) >> 16;
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regs.x.ecx = ((long)ptr & 0x0000FFFF);
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regs.x.esi = ((long)size & 0xFFFF0000) >> 16;
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regs.x.edi = ((long)size & 0x0000FFFF);
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int386x(DPMI_INT, ®s, ®s, &sregs);
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}
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#endif /* __WATCOMC__ */
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