150 lines
4.7 KiB
NASM
150 lines
4.7 KiB
NASM
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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: g:/library/wwlib32/system/rcs/opsys.asm 1.1 1994/04/18 09:14:12 jeff_wilson Exp $
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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 A S S O C I A T E S **
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;***************************************************************************
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;* *
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;* Project Name : Operating System Flags *
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;* *
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;* File Name : OPSYS.ASM *
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;* *
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;* Programmer : Scott Bowen *
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;* *
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;* Start Date : January 26, 1993 *
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;* *
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;* Last Update : January 26, 1993 [SB] *
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;* *
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;* Updated to 32bit protected mode JAW *
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;* *
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;*-------------------------------------------------------------------------*
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;* Functions: *
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;* Operating_System -- Determines what the operating system is. *
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;* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - *
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IDEAL
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P386
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MODEL USE32 FLAT
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GLOBAL C Operating_System :NEAR
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GLOBAL C OperatingSystem :WORD
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DOS equ 1
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WIN31STD equ 2
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WIN31ENH equ 3
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WIN30ENH equ 4
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WIN30STD equ 5
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WIN30REAL equ 6
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DATASEG
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OperatingSystem dw 0
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CODESEG
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;***************************************************************************
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;* Operating_System -- Determines what the operating system is. *
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;* *
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;* INPUT: NONE. *
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;* *
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;* OUTPUT: *
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;* *
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;* WARNINGS: *
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;* *
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;* HISTORY: *
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;* 01/26/1993 SB : Created. *
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;*=========================================================================*
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PROC Operating_System C near
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USES ebx,ecx,edx,es,edi
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; Check for Windows 3.1
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mov eax,160Ah ; WIN31CHECK
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int 2fh
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or ax,ax
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jz short RunningUnderWin31
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;check for Windows 3.0 enhanced mode
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mov eax,1600h ; WIN386CHECK
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int 2fh
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mov bl,al
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mov eax,WIN30ENH
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test bl,7fh
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jnz short Exit
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;check for 3.0 WINOLDAP
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mov eax,4680h ; IS_WINOLDAP_ACTIVE
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int 2fh
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or eax,eax
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jnz short NotRunningUnderWin
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; rule out MS-DOS 5.0 task switcher
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mov eax,4b02h ; detect switcher
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push ebx
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push es
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push edi
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xor ebx,ebx
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mov edi,ebx
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mov es,bx
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int 2fh
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pop edi
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pop es
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pop ebx
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or eax,eax
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jz short NotRunningUnderWin ; MS-DOS 5.0 task switcher found.
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; check for standrd mode Windows 3.0
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mov eax,1605h ;PMODE_START
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int 2fh
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mov eax,WIN30STD
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cmp ecx,-1
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jz short Exit
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;check for real mode Windows 3.0
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mov eax,1606h ; PMODE_STOP
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int 2fh
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mov eax,WIN30REAL
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jmp SHORT Exit
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RunningUnderWin31:
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; At this point: CX == 3 means Windows 3.1 enhanced mode.
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; CX == 2 means Windows 3.1 standard mode.
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mov eax,WIN31STD
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cmp ecx,2
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je short Exit
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mov eax,WIN31ENH
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jmp SHORT Exit
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NotRunningUnderWin:
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mov eax,DOS
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Exit:
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mov [WORD PTR OperatingSystem], ax
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ret
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ENDP Operating_System
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;----------------------------------------------------------------------------
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END
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