services.c

ReactOS是一些高手根据Windows XP的内核编写出的类XP。内核实现机理和API函数调用几乎相同。甚至可以兼容XP的程序。喜欢研究系统内核的人可以看一看。

/*
 * VideoPort driver
 *
 * Copyright (C) 2002, 2003, 2004 ReactOS Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library 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
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; see the file COPYING.LIB.
 * If not, write to the Free Software Foundation,
 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 *
 * $Id: services.c 21844 2006-05-07 19:34:23Z ion $
 */

#include "videoprt.h"

VOID NTAPI
IntInterfaceReference(PVOID Context)
{
   /* Do nothing */
}

VOID NTAPI
IntInterfaceDereference(PVOID Context)
{
   /* Do nothing */
}

VP_STATUS NTAPI
VideoPortQueryServices(
  IN PVOID HwDeviceExtension,
  IN VIDEO_PORT_SERVICES ServicesType,
  IN OUT PINTERFACE Interface)
{
   DPRINT("VideoPortQueryServices - ServicesType: 0x%x\n", ServicesType);

   switch (ServicesType)
   {
      case VideoPortServicesInt10:
         if (Interface->Version >= VIDEO_PORT_INT10_INTERFACE_VERSION_1 ||
             Interface->Size >= sizeof(VIDEO_PORT_INT10_INTERFACE))
         {
            VIDEO_PORT_INT10_INTERFACE *Int10Interface =
               (VIDEO_PORT_INT10_INTERFACE *)Interface;

            Interface->InterfaceReference = IntInterfaceReference;
            Interface->InterfaceDereference = IntInterfaceDereference;
            Int10Interface->Int10AllocateBuffer = IntInt10AllocateBuffer;
            Int10Interface->Int10FreeBuffer = IntInt10FreeBuffer;
            Int10Interface->Int10ReadMemory = IntInt10ReadMemory;
            Int10Interface->Int10WriteMemory = IntInt10WriteMemory;
            Int10Interface->Int10CallBios = IntInt10CallBios;
            return NO_ERROR;
         }
         break;

      case VideoPortServicesAGP:
         if ((Interface->Version == VIDEO_PORT_AGP_INTERFACE_VERSION_2 &&
              Interface->Size >= sizeof(VIDEO_PORT_AGP_INTERFACE_2)) ||
             (Interface->Version == VIDEO_PORT_AGP_INTERFACE_VERSION_1 &&
              Interface->Size >= sizeof(VIDEO_PORT_AGP_INTERFACE)))
         {
            if (NT_SUCCESS(IntAgpGetInterface(HwDeviceExtension, Interface)))
            {
               return NO_ERROR;
            }
         }
         break;

      case VideoPortServicesI2C:
      case VideoPortServicesHeadless:
         DPRINT1("VideoPortServices%s is UNIMPLEMENTED!\n",
                 (ServicesType == VideoPortServicesI2C) ? "I2C" : "Headless");
         return ERROR_CALL_NOT_IMPLEMENTED;

      default:
         break;
   }

   return ERROR_INVALID_FUNCTION;
}

BOOLEAN NTAPI
VideoPortGetAgpServices(
   IN PVOID HwDeviceExtension,
   OUT PVIDEO_PORT_AGP_SERVICES AgpServices)
{
   VIDEO_PORT_AGP_INTERFACE Interface;
   VP_STATUS Status;

   DPRINT("VideoPortGetAgpServices\n");

   Interface.Size = sizeof(Interface);
   Interface.Version = VIDEO_PORT_AGP_INTERFACE_VERSION_1;

   Status = VideoPortQueryServices(HwDeviceExtension, VideoPortServicesAGP,
                                   (PINTERFACE)&Interface);
   if (Status != NO_ERROR)
   {
      DPRINT("VideoPortQueryServices() failed!\n");
      return FALSE;
   }

   RtlCopyMemory(AgpServices, &Interface.AgpReservePhysical, sizeof(AgpServices));
   return TRUE;
}