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MdePkg/UefiLib: Add EfiLocateProtocolBuffer() 

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>
Reviewed-by: Star Zeng <star.zeng@intel.com>
Reviewed-by: Bret Barkelew <Bret.Barkelew@microsoft.com>
This commit is contained in:
Michael D Kinney 2018-01-02 10:40:07 -08:00
parent 6ef394ffe2
commit 40070a186a
2 changed files with 142 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
MdePkg/Include/Library/UefiLib.h
View File

@ -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

112
MdePkg/Library/UefiLib/UefiLib.c
View File

@ -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;
}