Source code of Windows XP (NT5)
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;******************************************************************************;; (C) Copyright MICROSOFT Corp., 1993-1994;; Title: Virtual Flat Device Exported Services;; Version: 2.00;; Date: 8-Nov-1993;; Author: RAP;;------------------------------------------------------------------------------;; Change log:;; DATE REV DESCRIPTION; ----------- --- -----------------------------------------------------------; 08-Nov-1993 RAP Original;;==============================================================================
IFDEF VMM_TRUEBegin_Service_Table VFLATD
VFLATD_Service VFLATD_Get_Version, LOCALVFLATD_Service VFLATD_Unmap_Flat_Selector, LOCAL
End_Service_Table VFLATDENDIF
VflatD_Chicago_ID equ 011Fh ; OEM #8 Device #31VflatD_Windows_ID equ (0440h + 29d) ; MMSYS OEM# device 30
ifdef WIN31VflatD_Device_ID equ VflatD_Windows_IDVflatD_Version equ 0160h ; 1.60elseVflatD_Device_ID equ VflatD_Chicago_IDVflatD_Version equ 0201h ; 2.01endif
;; PM API defines;VFlatD_Query equ 0VFlatD_Get_Sel equ 1VFlatD_ResetBank equ 2VFlatD_Create_Virtual_Frame_Buffer equ 3VFlatD_Create_Physical_Frame_Buffer equ 4VFlatD_Begin_Linear_Access equ 5VFlatD_End_Linear_Access equ 6
;******************************************************************************;; VFLATD_PM_API_Query;; DESCRIPTION:; Query VFlatD info;; ENTRY:; Client_DX = 0;; EXIT:; Client_EAX = VFlatD version (HIWORD flags); Client_EBX = GDT selector to the frame buffer; Client_ECX = size of frame buffer; Client_EDX = linear base of frame buffer. (if linear mode);;==============================================================================
;******************************************************************************;; VFLATD_PM_API_Create_Virtual_Frame_Buffer;; DESCRIPTION:; Return a GDT selector to the flat video buffer;; ENTRY:; Client_DL = 3; Client_DH = flags; Client_EAX = size of frame buffer (in bytes) (ie 2MB); Client_EBX = size of a bank (in bytes) (ie 64k); Client_ESI = location of bank (ie A0000); Client_CX = size of bank switch code; Client_ES:DI = ptr to bank switch code;; EXIT:; Client_AX = Selector to flat video buffer; Client_EDX = Linear base of flat video buffer; Client carry flag clear;;==============================================================================
;******************************************************************************;; VFLATD_PM_API_Create_Physical_Frame_Buffer;; DESCRIPTION:; Return a GDT selector to a flat video buffer;; ENTRY:; Client_DL = 4; Client_DH = flags; Client_EAX = physical base of frame buffer; Client_ECX = size of frame buffer (in bytes);; EXIT:; Client_AX = Selector to flat video buffer; Client_EDX = Linear base of flat video buffer; Client carry flag clear;;==============================================================================
;******************************************************************************;; VFLATD_PM_API_Get_Video_Base;; this function has been replaced with VflatD_Create_Virtual_Frame_Buffer; it is still supported for old code.;; DESCRIPTION:; Return a GDT selector to the flat video buffer;; ENTRY:; Client_DX = 1; Client_AX = # of pages of video memory; Client_CX = size of bank switch code; Client_ES:DI -> bank switch code;; EXIT:; Client_AX = Selector to flat video buffer; Client_EDX = Linear base of flat video buffer; Client carry flag clear;;==============================================================================
;******************************************************************************;; VFLATD_PM_API_Reset;; DESCRIPTION:; Called when Video HW has been changed by someone other; than VFLATD.;; ENTRY:; Client_DX = 2;; EXIT:; Client carry flag clear;; USES:; EAX, Flags, Client_AX, Client_Flags;;==============================================================================
;******************************************************************************;; VFLATD_PM_API_Begin_Linear_Access;; DESCRIPTION:; Start linear access to the frame buffer;; the frame buffer can be accessed via its linear address; (by default the frame buffer *must* be accessed with; the default selector);; the frame bufffer will remain in linear access mode, until; VFLATD_PM_API_End_Linear_Access is called.;; this call can be nested.;; ENTRY:; Client_DX = 5;; EXIT:; Client_EAX = access count;;==============================================================================
;******************************************************************************;; VFLATD_PM_API_End_Linear_Access;; DESCRIPTION:; Stop linear access to the frame buffer;; this must be called the same number of times as; VFLATD_PM_API_Begin_Linear_Access to actualy leave linear mode.;; ENTRY:; Client_DX = 6;; EXIT:; Client_EAX = access count;;==============================================================================
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