_pmwin32.asm

BIOS emulator and interface to Realmode X86 Emulator Library Can emulate a PCI Graphic Controller V

;****************************************************************************
;*
;*					SciTech OS Portability Manager Library
;*
;*  ========================================================================
;*
;*    The contents of this file are subject to the SciTech MGL Public
;*    License Version 1.0 (the "License"); you may not use this file
;*    except in compliance with the License. You may obtain a copy of
;*    the License at http://www.scitechsoft.com/mgl-license.txt
;*
;*    Software distributed under the License is distributed on an
;*    "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
;*    implied. See the License for the specific language governing
;*    rights and limitations under the License.
;*
;*    The Original Code is Copyright (C) 1991-1998 SciTech Software, Inc.
;*
;*    The Initial Developer of the Original Code is SciTech Software, Inc.
;*    All Rights Reserved.
;*
;*  ========================================================================
;*
;* Language:	80386 Assembler, TASM 4.0 or NASM
;* Environment:	Win32
;*
;* Description:	Low level assembly support for the PM library specific
;*				to Windows.
;*
;****************************************************************************

		IDEAL

include	"scitech.mac"				; Memory model macros

header    	_pmwin32             		; Set up memory model

begdataseg	_pmwin32

		cglobal	_PM_ioentry
		cglobal	_PM_gdt
_PM_ioentry		dd	0				; Offset to call gate
_PM_gdt			dw	0				; Selector to call gate

enddataseg	_pmwin32

begcodeseg  _pmwin32					; Start of code segment

;----------------------------------------------------------------------------
; int PM_setIOPL(int iopl)
;----------------------------------------------------------------------------
; Change the IOPL level for the 32-bit task. Returns the previous level
; so it can be restored for the task correctly.
;----------------------------------------------------------------------------
cprocstart  PM_setIOPL

		ARG		iopl:UINT

		enter_c
		pushfd						; Save the old EFLAGS for later
		mov		ecx,[iopl]			; ECX := IOPL level
		xor		ebx,ebx				; Change IOPL level function code
ifdef	USE_NASM
		call far dword [_PM_ioentry]
else
		call	[FWORD _PM_ioentry]
endif
		pop		eax
		and		eax,0011000000000000b
		shr		eax,12
		leave_c
		ret

cprocend

endcodeseg  _pmwin32

		END							; End of module