1 /** @file 2 Help functions to access UDP service. 3 4 Copyright (c) 2005 - 2007, Intel Corporation. All rights reserved.<BR> 5 This program and the accompanying materials 6 are licensed and made available under the terms and conditions of the BSD License 7 which accompanies this distribution. The full text of the license may be found at 8 http://opensource.org/licenses/bsd-license.php 9 10 THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, 11 WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. 12 **/ 13 14 #include <Uefi.h> 15 #include <Library/DebugLib.h> 16 #include <Library/UefiBootServicesTableLib.h> 17 #include <Protocol/Dpc.h> 18 19 // 20 // Pointer to the DPC Protocol 21 // 22 EFI_DPC_PROTOCOL *mDpc; 23 24 /** 25 This constructor function caches the EFI_DPC_PROTOCOL pointer. 26 27 @param[in] ImageHandle The firmware allocated handle for the EFI image. 28 @param[in] SystemTable A pointer to the EFI System Table. 29 30 @retval EFI_SUCCESS The constructor always return EFI_SUCCESS. 31 32 **/ 33 EFI_STATUS 34 EFIAPI 35 DpcLibConstructor ( 36 IN EFI_HANDLE ImageHandle, 37 IN EFI_SYSTEM_TABLE *SystemTable 38 ) 39 { 40 EFI_STATUS Status; 41 42 // 43 // Locate the EFI_DPC_PROTOCOL in the handle database 44 // 45 Status = gBS->LocateProtocol (&gEfiDpcProtocolGuid, NULL, (VOID **)&mDpc); 46 ASSERT_EFI_ERROR (Status); 47 48 return EFI_SUCCESS; 49 } 50 51 /** 52 Add a Deferred Procedure Call to the end of the DPC queue. 53 54 @param[in] DpcTpl The EFI_TPL that the DPC should be invoked. 55 @param[in] DpcProcedure Pointer to the DPC's function. 56 @param[in] DpcContext Pointer to the DPC's context. Passed to DpcProcedure 57 when DpcProcedure is invoked. 58 59 @retval EFI_SUCCESS The DPC was queued. 60 @retval EFI_INVALID_PARAMETER DpcTpl is not a valid EFI_TPL. 61 @retval EFI_INVALID_PARAMETER DpcProcedure is NULL. 62 @retval EFI_OUT_OF_RESOURCES There are not enough resources available to 63 add the DPC to the queue. 64 65 **/ 66 EFI_STATUS 67 EFIAPI 68 QueueDpc ( 69 IN EFI_TPL DpcTpl, 70 IN EFI_DPC_PROCEDURE DpcProcedure, 71 IN VOID *DpcContext OPTIONAL 72 ) 73 { 74 // 75 // Call the EFI_DPC_PROTOCOL to queue the DPC 76 // 77 return mDpc->QueueDpc (mDpc, DpcTpl, DpcProcedure, DpcContext); 78 } 79 80 /** 81 Dispatch the queue of DPCs. ALL DPCs that have been queued with a DpcTpl 82 value greater than or equal to the current TPL are invoked in the order that 83 they were queued. DPCs with higher DpcTpl values are invoked before DPCs with 84 lower DpcTpl values. 85 86 @retval EFI_SUCCESS One or more DPCs were invoked. 87 @retval EFI_NOT_FOUND No DPCs were invoked. 88 89 **/ 90 EFI_STATUS 91 EFIAPI 92 DispatchDpc ( 93 VOID 94 ) 95 { 96 // 97 // Call the EFI_DPC_PROTOCOL to dispatch previously queued DPCs 98 // 99 return mDpc->DispatchDpc (mDpc); 100 } 101
