66 lines
2.7 KiB
C
66 lines
2.7 KiB
C
/** @file
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DXE Chipset Services Library.
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This file contains only one function that is DxeCsSvcLegacyRegionAccessCtrl().
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The function DxeCsSvcLegacyRegionAccessCtrl() use chipset services to control
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legacy region can be access or not.
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***************************************************************************
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* Copyright (c) 2012, Insyde Software Corp. All Rights Reserved.
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*
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* You may not reproduce, distribute, publish, display, perform, modify, adapt,
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* transmit, broadcast, present, recite, release, license or otherwise exploit
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* any part of this publication in any form, by any means, without the prior
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* written permission of Insyde Software Corporation.
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*
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******************************************************************************
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*/
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#include <PiDxe.h>
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#include <Library/DebugLib.h>
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#include <Protocol/H2ODxeChipsetServices.h>
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//
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// Global Variables (This Source File Only)
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//
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extern H2O_CHIPSET_SERVICES_PROTOCOL *mChipsetSvc;
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/**
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Legacy Region Access Ctrl.
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@param[in] Start Start of the region to lock or unlock.
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@param[in] Length Length of the region.
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@param[in] Mode If LEGACY_REGION_ACCESS_LOCK, then
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LegacyRegionAccessCtrl() lock the specific
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legacy region.
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@retval EFI_SUCCESS Function returns successfully
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@retval EFI_UNSUPPORTED If the function is not implemented.
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@retval EFI_INVALID_PARAMETER 1. The parameter Start is small then 0xC0000.
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2. The parameter Length is to long.
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The Start + Length - 1 should small then 0xF0000.
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3. The Mode parameter is neither
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LEGACY_REGION_ACCESS_LOCK nor LEGACY_REGION_ACCESS_UNLOCK
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*/
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EFI_STATUS
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DxeCsSvcLegacyRegionAccessCtrl (
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IN UINT32 Start,
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IN UINT32 Length,
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IN UINT32 Mode
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)
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{
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//
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// Verify that the protocol interface structure contains the function
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// pointer and whether that function pointer is non-NULL. If not, return
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// an error.
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//
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if (mChipsetSvc == NULL ||
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mChipsetSvc->Size < (OFFSET_OF (H2O_CHIPSET_SERVICES_PROTOCOL, LegacyRegionAccessCtrl) + sizeof (VOID*)) ||
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mChipsetSvc->LegacyRegionAccessCtrl == NULL) {
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DEBUG ((EFI_D_ERROR, "H2O DXE Chipset Services can not be found or member LegacyRegionAccessCtrl() isn't implement!\n"));
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return EFI_UNSUPPORTED;
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}
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return mChipsetSvc->LegacyRegionAccessCtrl (Start, Length, Mode);
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}
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