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95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/** @file
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Help functions to access UDP service.
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Copyright (c) 2005 - 2018, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include <Uefi.h>
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#include <Library/DebugLib.h>
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#include <Library/UefiBootServicesTableLib.h>
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#include <Protocol/Dpc.h>
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//
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// Pointer to the DPC Protocol
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//
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EFI_DPC_PROTOCOL *mDpc;
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/**
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This constructor function caches the EFI_DPC_PROTOCOL pointer.
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@param[in] ImageHandle The firmware allocated handle for the EFI image.
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@param[in] SystemTable A pointer to the EFI System Table.
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@retval EFI_SUCCESS The constructor always return EFI_SUCCESS.
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**/
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EFI_STATUS
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EFIAPI
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DpcLibConstructor (
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IN EFI_HANDLE ImageHandle,
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IN EFI_SYSTEM_TABLE *SystemTable
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)
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{
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EFI_STATUS Status;
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//
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// Locate the EFI_DPC_PROTOCOL in the handle database
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//
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Status = gBS->LocateProtocol (&gEfiDpcProtocolGuid, NULL, (VOID **)&mDpc);
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ASSERT_EFI_ERROR (Status);
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return Status;
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}
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/**
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Add a Deferred Procedure Call to the end of the DPC queue.
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@param[in] DpcTpl The EFI_TPL that the DPC should be invoked.
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@param[in] DpcProcedure Pointer to the DPC's function.
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@param[in] DpcContext Pointer to the DPC's context. Passed to DpcProcedure
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when DpcProcedure is invoked.
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@retval EFI_SUCCESS The DPC was queued.
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@retval EFI_INVALID_PARAMETER DpcTpl is not a valid EFI_TPL.
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@retval EFI_INVALID_PARAMETER DpcProcedure is NULL.
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@retval EFI_OUT_OF_RESOURCES There are not enough resources available to
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add the DPC to the queue.
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**/
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EFI_STATUS
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EFIAPI
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QueueDpc (
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IN EFI_TPL DpcTpl,
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IN EFI_DPC_PROCEDURE DpcProcedure,
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IN VOID *DpcContext OPTIONAL
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)
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{
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//
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// Call the EFI_DPC_PROTOCOL to queue the DPC
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//
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return mDpc->QueueDpc (mDpc, DpcTpl, DpcProcedure, DpcContext);
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}
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/**
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Dispatch the queue of DPCs. ALL DPCs that have been queued with a DpcTpl
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value greater than or equal to the current TPL are invoked in the order that
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they were queued. DPCs with higher DpcTpl values are invoked before DPCs with
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lower DpcTpl values.
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@retval EFI_SUCCESS One or more DPCs were invoked.
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@retval EFI_NOT_FOUND No DPCs were invoked.
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**/
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EFI_STATUS
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EFIAPI
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DispatchDpc (
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VOID
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)
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{
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//
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// Call the EFI_DPC_PROTOCOL to dispatch previously queued DPCs
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//
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return mDpc->DispatchDpc (mDpc);
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}
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