From: Michael D Kinney <michael.d.kinney@intel.com>

https://bugzilla.tianocore.org/show_bug.cgi?id=838

Add new API to the UefiLib that locates and returns
an array of protocols instances that match a given
protocol.

Cc: Sean Brogan <sean.brogan@microsoft.com>
Cc: Jiewen Yao <jiewen.yao@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
---
 MdePkg/Include/Library/UefiLib.h |  32 ++++++++++-
 MdePkg/Library/UefiLib/UefiLib.c | 112 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 142 insertions(+), 2 deletions(-)

diff --git a/MdePkg/Include/Library/UefiLib.h b/MdePkg/Include/Library/UefiLib.h
index 0b14792a0a..54bc2cc5a3 100644
--- a/MdePkg/Include/Library/UefiLib.h
+++ b/MdePkg/Include/Library/UefiLib.h
@@ -12,7 +12,7 @@
   of size reduction when compiler optimization is disabled. If MDEPKG_NDEBUG is
   defined, then debug and assert related macros wrapped by it are the NULL implementations.
 
-Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials are licensed and made available under 
 the terms and conditions of the BSD License that accompanies this distribution.  
 The full text of the license may be found at
@@ -1490,4 +1490,34 @@ CatSPrint (
   ...
   );
 
+/**
+  Returns an array of protocol instance that matches the given protocol.
+
+  @param[in]  Protocol      Provides the protocol to search for.
+  @param[out] NoProtocols   The number of protocols returned in Buffer.
+  @param[out] Buffer        A pointer to the buffer to return the requested
+                            array of protocol instances that match Protocol.
+                            The returned buffer is allocated using
+                            EFI_BOOT_SERVICES.AllocatePool().  The caller is
+                            responsible for freeing this buffer with
+                            EFI_BOOT_SERVICES.FreePool().
+
+  @retval EFI_SUCCESS            The array of protocols was returned in Buffer,
+                                 and the number of protocols in Buffer was
+                                 returned in NoProtocols.
+  @retval EFI_NOT_FOUND          No protocols found.
+  @retval EFI_OUT_OF_RESOURCES   There is not enough pool memory to store the
+                                 matching results.
+  @retval EFI_INVALID_PARAMETER  Protocol is NULL.
+  @retval EFI_INVALID_PARAMETER  NoProtocols is NULL.
+  @retval EFI_INVALID_PARAMETER  Buffer is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+EfiLocateProtocolBuffer (
+  IN  EFI_GUID  *Protocol,
+  OUT UINTN     *NoProtocols,
+  OUT VOID      ***Buffer
+  );
 #endif
diff --git a/MdePkg/Library/UefiLib/UefiLib.c b/MdePkg/Library/UefiLib/UefiLib.c
index a7eee01240..f1a3f1c7af 100644
--- a/MdePkg/Library/UefiLib/UefiLib.c
+++ b/MdePkg/Library/UefiLib/UefiLib.c
@@ -5,7 +5,7 @@
   EFI Driver Model related protocols, manage Unicode string tables for UEFI Drivers, 
   and print messages on the console output and standard error devices.
 
-  Copyright (c) 2006 - 2017, Intel Corporation. All rights reserved.<BR>
+  Copyright (c) 2006 - 2018, Intel Corporation. All rights reserved.<BR>
   This program and the accompanying materials
   are licensed and made available under the terms and conditions of the BSD License
   which accompanies this distribution.  The full text of the license may be found at
@@ -1605,3 +1605,113 @@ GetBestLanguage (
   //
   return NULL;
 }
+
+/**
+  Returns an array of protocol instance that matches the given protocol.
+
+  @param[in]  Protocol      Provides the protocol to search for.
+  @param[out] NoProtocols   The number of protocols returned in Buffer.
+  @param[out] Buffer        A pointer to the buffer to return the requested
+                            array of protocol instances that match Protocol.
+                            The returned buffer is allocated using
+                            EFI_BOOT_SERVICES.AllocatePool().  The caller is
+                            responsible for freeing this buffer with
+                            EFI_BOOT_SERVICES.FreePool().
+
+  @retval EFI_SUCCESS            The array of protocols was returned in Buffer,
+                                 and the number of protocols in Buffer was
+                                 returned in NoProtocols.
+  @retval EFI_NOT_FOUND          No protocols found.
+  @retval EFI_OUT_OF_RESOURCES   There is not enough pool memory to store the
+                                 matching results.
+  @retval EFI_INVALID_PARAMETER  Protocol is NULL.
+  @retval EFI_INVALID_PARAMETER  NoProtocols is NULL.
+  @retval EFI_INVALID_PARAMETER  Buffer is NULL.
+
+**/
+EFI_STATUS
+EFIAPI
+EfiLocateProtocolBuffer (
+  IN  EFI_GUID  *Protocol,
+  OUT UINTN     *NoProtocols,
+  OUT VOID      ***Buffer
+  )
+{
+  EFI_STATUS  Status;
+  UINTN       NoHandles;
+  EFI_HANDLE  *HandleBuffer;
+  UINTN       Index;
+
+  //
+  // Check input parameters
+  //
+  if (Protocol == NULL || NoProtocols == NULL || Buffer == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  //
+  // Initialze output parameters
+  //
+  *NoProtocols = 0;
+  *Buffer = NULL;
+
+  //
+  // Retrieve the array of handles that support Protocol
+  //
+  Status = gBS->LocateHandleBuffer (
+                  ByProtocol,
+                  Protocol,
+                  NULL,
+                  &NoHandles,
+                  &HandleBuffer
+                  );
+  if (EFI_ERROR (Status)) {
+    return Status;
+  }
+
+  //
+  // Allocate array of protocol instances
+  //
+  Status = gBS->AllocatePool (
+                  EfiBootServicesData,
+                  NoHandles * sizeof (VOID *),
+                  (VOID **)Buffer
+                  );
+  if (EFI_ERROR (Status)) {
+    return EFI_OUT_OF_RESOURCES;
+  }
+  ZeroMem (*Buffer, NoHandles * sizeof (VOID *));
+
+  //
+  // Lookup Protocol on each handle in HandleBuffer to fill in the array of
+  // protocol instances.  Handle case where protocol instance was present when
+  // LocateHandleBuffer() was called, but is not present when HandleProtocol()
+  // is called.
+  //
+  for (Index = 0, *NoProtocols = 0; Index < NoHandles; Index++) {
+    Status = gBS->HandleProtocol (
+                    HandleBuffer[Index],
+                    Protocol,
+                    &((*Buffer)[*NoProtocols])
+                    );
+    if (!EFI_ERROR (Status)) {
+      (*NoProtocols)++;
+    }
+  }
+
+  //
+  // Free the handle buffer
+  //
+  gBS->FreePool (HandleBuffer);
+
+  //
+  // Make sure at least one protocol instance was found
+  //
+  if (*NoProtocols == 0) {
+    gBS->FreePool (*Buffer);
+    *Buffer = NULL;
+    return EFI_NOT_FOUND;
+  }
+
+  return EFI_SUCCESS;
+}
-- 
2.14.2.windows.3

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