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audk/MdeModulePkg/Core/Dxe/Hand/Locate.c

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/** @file
Locate handle functions
Copyright (c) 2006 - 2008, Intel Corporation. <BR>
All rights reserved. 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
http://opensource.org/licenses/bsd-license.php
THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
**/
#include "DxeMain.h"
#include "Handle.h"
//
// ProtocolRequest - Last LocateHandle request ID
//
UINTN mEfiLocateHandleRequest = 0;
//
// Internal prototypes
//
typedef struct {
EFI_GUID *Protocol;
VOID *SearchKey;
LIST_ENTRY *Position;
PROTOCOL_ENTRY *ProtEntry;
} LOCATE_POSITION;
typedef
IHANDLE *
(* CORE_GET_NEXT) (
IN OUT LOCATE_POSITION *Position,
OUT VOID **Interface
);
/**
Routine to get the next Handle, when you are searching for all handles.
@param Position Information about which Handle to seach for.
@param Interface Return the interface structure for the matching
protocol.
@return An pointer to IHANDLE if the next Position is not the end of the list.
Otherwise,NULL is returned.
**/
IHANDLE *
CoreGetNextLocateAllHandles (
IN OUT LOCATE_POSITION *Position,
OUT VOID **Interface
);
/**
Routine to get the next Handle, when you are searching for register protocol
notifies.
@param Position Information about which Handle to seach for.
@param Interface Return the interface structure for the matching
protocol.
@return An pointer to IHANDLE if the next Position is not the end of the list.
Otherwise,NULL is returned.
**/
IHANDLE *
CoreGetNextLocateByRegisterNotify (
IN OUT LOCATE_POSITION *Position,
OUT VOID **Interface
);
/**
Routine to get the next Handle, when you are searching for a given protocol.
@param Position Information about which Handle to seach for.
@param Interface Return the interface structure for the matching
protocol.
@return An pointer to IHANDLE if the next Position is not the end of the list.
Otherwise,NULL is returned.
**/
IHANDLE *
CoreGetNextLocateByProtocol (
IN OUT LOCATE_POSITION *Position,
OUT VOID **Interface
);
/**
Locates the requested handle(s) and returns them in Buffer.
@param SearchType The type of search to perform to locate the
handles
@param Protocol The protocol to search for
@param SearchKey Dependant on SearchType
@param BufferSize On input the size of Buffer. On output the
size of data returned.
@param Buffer The buffer to return the results in
@retval EFI_BUFFER_TOO_SMALL Buffer too small, required buffer size is
returned in BufferSize.
@retval EFI_INVALID_PARAMETER Invalid parameter
@retval EFI_SUCCESS Successfully found the requested handle(s) and
returns them in Buffer.
**/
EFI_STATUS
EFIAPI
CoreLocateHandle (
IN EFI_LOCATE_SEARCH_TYPE SearchType,
IN EFI_GUID *Protocol OPTIONAL,
IN VOID *SearchKey OPTIONAL,
IN OUT UINTN *BufferSize,
OUT EFI_HANDLE *Buffer
)
{
EFI_STATUS Status;
LOCATE_POSITION Position;
PROTOCOL_NOTIFY *ProtNotify;
CORE_GET_NEXT GetNext;
UINTN ResultSize;
IHANDLE *Handle;
IHANDLE **ResultBuffer;
VOID *Interface;
if (BufferSize == NULL) {
return EFI_INVALID_PARAMETER;
}
if ((*BufferSize > 0) && (Buffer == NULL)) {
return EFI_INVALID_PARAMETER;
}
GetNext = NULL;
//
// Set initial position
//
Position.Protocol = Protocol;
Position.SearchKey = SearchKey;
Position.Position = &gHandleList;
ResultSize = 0;
ResultBuffer = (IHANDLE **) Buffer;
Status = EFI_SUCCESS;
//
// Lock the protocol database
//
CoreAcquireProtocolLock ();
//
// Get the search function based on type
//
switch (SearchType) {
case AllHandles:
GetNext = CoreGetNextLocateAllHandles;
break;
case ByRegisterNotify:
//
// Must have SearchKey for locate ByRegisterNotify
//
if (SearchKey == NULL) {
Status = EFI_INVALID_PARAMETER;
break;
}
GetNext = CoreGetNextLocateByRegisterNotify;
break;
case ByProtocol:
GetNext = CoreGetNextLocateByProtocol;
if (Protocol == NULL) {
Status = EFI_INVALID_PARAMETER;
break;
}
//
// Look up the protocol entry and set the head pointer
//
Position.ProtEntry = CoreFindProtocolEntry (Protocol, FALSE);
if (Position.ProtEntry == NULL) {
Status = EFI_NOT_FOUND;
break;
}
Position.Position = &Position.ProtEntry->Protocols;
break;
default:
Status = EFI_INVALID_PARAMETER;
break;
}
if (EFI_ERROR(Status)) {
CoreReleaseProtocolLock ();
return Status;
}
//
// Enumerate out the matching handles
//
mEfiLocateHandleRequest += 1;
for (; ;) {
//
// Get the next handle. If no more handles, stop
//
Handle = GetNext (&Position, &Interface);
if (NULL == Handle) {
break;
}
//
// Increase the resulting buffer size, and if this handle
// fits return it
//
ResultSize += sizeof(Handle);
if (ResultSize <= *BufferSize) {
*ResultBuffer = Handle;
ResultBuffer += 1;
}
}
//
// If the result is a zero length buffer, then there were no
// matching handles
//
if (ResultSize == 0) {
Status = EFI_NOT_FOUND;
} else {
//
// Return the resulting buffer size. If it's larger than what
// was passed, then set the error code
//
if (ResultSize > *BufferSize) {
Status = EFI_BUFFER_TOO_SMALL;
}
*BufferSize = ResultSize;
if (SearchType == ByRegisterNotify && !EFI_ERROR(Status)) {
//
// If this is a search by register notify and a handle was
// returned, update the register notification position
//
ProtNotify = SearchKey;
ProtNotify->Position = ProtNotify->Position->ForwardLink;
}
}
CoreReleaseProtocolLock ();
return Status;
}
/**
Routine to get the next Handle, when you are searching for all handles.
@param Position Information about which Handle to seach for.
@param Interface Return the interface structure for the matching
protocol.
@return An pointer to IHANDLE if the next Position is not the end of the list.
Otherwise,NULL is returned.
**/
IHANDLE *
CoreGetNextLocateAllHandles (
IN OUT LOCATE_POSITION *Position,
OUT VOID **Interface
)
{
IHANDLE *Handle;
//
// Next handle
//
Position->Position = Position->Position->ForwardLink;
//
// If not at the end of the list, get the handle
//
Handle = NULL;
*Interface = NULL;
if (Position->Position != &gHandleList) {
Handle = CR (Position->Position, IHANDLE, AllHandles, EFI_HANDLE_SIGNATURE);
}
return Handle;
}
/**
Routine to get the next Handle, when you are searching for register protocol
notifies.
@param Position Information about which Handle to seach for.
@param Interface Return the interface structure for the matching
protocol.
@return An pointer to IHANDLE if the next Position is not the end of the list.
Otherwise,NULL is returned.
**/
IHANDLE *
CoreGetNextLocateByRegisterNotify (
IN OUT LOCATE_POSITION *Position,
OUT VOID **Interface
)
{
IHANDLE *Handle;
PROTOCOL_NOTIFY *ProtNotify;
PROTOCOL_INTERFACE *Prot;
LIST_ENTRY *Link;
Handle = NULL;
*Interface = NULL;
ProtNotify = Position->SearchKey;
//
// If this is the first request, get the next handle
//
if (ProtNotify != NULL) {
ASSERT(ProtNotify->Signature == PROTOCOL_NOTIFY_SIGNATURE);
Position->SearchKey = NULL;
//
// If not at the end of the list, get the next handle
//
Link = ProtNotify->Position->ForwardLink;
if (Link != &ProtNotify->Protocol->Protocols) {
Prot = CR (Link, PROTOCOL_INTERFACE, ByProtocol, PROTOCOL_INTERFACE_SIGNATURE);
Handle = Prot->Handle;
*Interface = Prot->Interface;
}
}
return Handle;
}
/**
Routine to get the next Handle, when you are searching for a given protocol.
@param Position Information about which Handle to seach for.
@param Interface Return the interface structure for the matching
protocol.
@return An pointer to IHANDLE if the next Position is not the end of the list.
Otherwise,NULL is returned.
**/
IHANDLE *
CoreGetNextLocateByProtocol (
IN OUT LOCATE_POSITION *Position,
OUT VOID **Interface
)
{
IHANDLE *Handle;
LIST_ENTRY *Link;
PROTOCOL_INTERFACE *Prot;
Handle = NULL;
*Interface = NULL;
for (; ;) {
//
// Next entry
//
Link = Position->Position->ForwardLink;
Position->Position = Link;
//
// If not at the end, return the handle
//
if (Link == &Position->ProtEntry->Protocols) {
Handle = NULL;
break;
}
//
// Get the handle
//
Prot = CR(Link, PROTOCOL_INTERFACE, ByProtocol, PROTOCOL_INTERFACE_SIGNATURE);
Handle = Prot->Handle;
*Interface = Prot->Interface;
//
// If this handle has not been returned this request, then
// return it now
//
if (Handle->LocateRequest != mEfiLocateHandleRequest) {
Handle->LocateRequest = mEfiLocateHandleRequest;
break;
}
}
return Handle;
}
/**
Locates the handle to a device on the device path that best matches the specified protocol.
@param Protocol The protocol to search for.
@param DevicePath On input, a pointer to a pointer to the device
path. On output, the device path pointer is
modified to point to the remaining part of the
devicepath.
@param Device A pointer to the returned device handle.
@retval EFI_SUCCESS The resulting handle was returned.
@retval EFI_NOT_FOUND No handles matched the search.
@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
**/
EFI_STATUS
EFIAPI
CoreLocateDevicePath (
IN EFI_GUID *Protocol,
IN OUT EFI_DEVICE_PATH_PROTOCOL **DevicePath,
OUT EFI_HANDLE *Device
)
{
INTN SourceSize;
INTN Size;
INTN BestMatch;
UINTN HandleCount;
UINTN Index;
EFI_STATUS Status;
EFI_HANDLE *Handles;
EFI_HANDLE Handle;
EFI_DEVICE_PATH_PROTOCOL *SourcePath;
EFI_DEVICE_PATH_PROTOCOL *TmpDevicePath;
if (Protocol == NULL) {
return EFI_INVALID_PARAMETER;
}
if ((DevicePath == NULL) || (*DevicePath == NULL)) {
return EFI_INVALID_PARAMETER;
}
if (Device == NULL) {
return EFI_INVALID_PARAMETER;
}
*Device = NULL;
SourcePath = *DevicePath;
SourceSize = GetDevicePathSize (SourcePath) - sizeof(EFI_DEVICE_PATH_PROTOCOL);
//
// The source path can only have 1 instance
//
if (IsDevicePathMultiInstance (SourcePath)) {
DEBUG((DEBUG_ERROR, "LocateDevicePath: Device path has too many instances\n"));
return EFI_INVALID_PARAMETER;
}
//
// Get a list of all handles that support the requested protocol
//
Status = CoreLocateHandleBuffer (ByProtocol, Protocol, NULL, &HandleCount, &Handles);
if (EFI_ERROR (Status) || HandleCount == 0) {
return EFI_NOT_FOUND;
}
BestMatch = -1;
for(Index = 0; Index < HandleCount; Index += 1) {
Handle = Handles[Index];
Status = CoreHandleProtocol (Handle, &gEfiDevicePathProtocolGuid, (VOID **)&TmpDevicePath);
if (EFI_ERROR (Status)) {
//
// If this handle doesn't support device path, then skip it
//
continue;
}
//
// Check if DevicePath is first part of SourcePath
//
Size = GetDevicePathSize (TmpDevicePath) - sizeof(EFI_DEVICE_PATH_PROTOCOL);
if ((Size <= SourceSize) && CompareMem (SourcePath, TmpDevicePath, Size) == 0) {
//
// If the size is equal to the best match, then we
// have a duplice device path for 2 different device
// handles
//
ASSERT (Size != BestMatch);
//
// We've got a match, see if it's the best match so far
//
if (Size > BestMatch) {
BestMatch = Size;
*Device = Handle;
}
}
}
CoreFreePool (Handles);
//
// If there wasn't any match, then no parts of the device path was found.
// Which is strange since there is likely a "root level" device path in the system.
//
if (BestMatch == -1) {
return EFI_NOT_FOUND;
}
//
// Return the remaining part of the device path
//
*DevicePath = (EFI_DEVICE_PATH_PROTOCOL *) (((UINT8 *) SourcePath) + BestMatch);
return EFI_SUCCESS;
}
/**
Return the first Protocol Interface that matches the Protocol GUID. If
Registration is pasased in return a Protocol Instance that was just add
to the system. If Retistration is NULL return the first Protocol Interface
you find.
@param Protocol The protocol to search for
@param Registration Optional Registration Key returned from
RegisterProtocolNotify()
@param Interface Return the Protocol interface (instance).
@retval EFI_SUCCESS If a valid Interface is returned
@retval EFI_INVALID_PARAMETER Invalid parameter
@retval EFI_NOT_FOUND Protocol interface not found
**/
EFI_STATUS
EFIAPI
CoreLocateProtocol (
IN EFI_GUID *Protocol,
IN VOID *Registration OPTIONAL,
OUT VOID **Interface
)
{
EFI_STATUS Status;
LOCATE_POSITION Position;
PROTOCOL_NOTIFY *ProtNotify;
IHANDLE *Handle;
if (Interface == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Protocol == NULL) {
return EFI_NOT_FOUND;
}
*Interface = NULL;
Status = EFI_SUCCESS;
//
// Set initial position
//
Position.Protocol = Protocol;
Position.SearchKey = Registration;
Position.Position = &gHandleList;
//
// Lock the protocol database
//
CoreAcquireProtocolLock ();
mEfiLocateHandleRequest += 1;
if (Registration == NULL) {
//
// Look up the protocol entry and set the head pointer
//
Position.ProtEntry = CoreFindProtocolEntry (Protocol, FALSE);
if (Position.ProtEntry == NULL) {
Status = EFI_NOT_FOUND;
goto Done;
}
Position.Position = &Position.ProtEntry->Protocols;
Handle = CoreGetNextLocateByProtocol (&Position, Interface);
} else {
Handle = CoreGetNextLocateByRegisterNotify (&Position, Interface);
}
if (Handle == NULL) {
Status = EFI_NOT_FOUND;
} else if (Registration != NULL) {
//
// If this is a search by register notify and a handle was
// returned, update the register notification position
//
ProtNotify = Registration;
ProtNotify->Position = ProtNotify->Position->ForwardLink;
}
Done:
CoreReleaseProtocolLock ();
return Status;
}
/**
Function returns an array of handles that support the requested protocol
in a buffer allocated from pool. This is a version of CoreLocateHandle()
that allocates a buffer for the caller.
@param SearchType Specifies which handle(s) are to be returned.
@param Protocol Provides the protocol to search by. This
parameter is only valid for SearchType
ByProtocol.
@param SearchKey Supplies the search key depending on the
SearchType.
@param NumberHandles The number of handles returned in Buffer.
@param Buffer A pointer to the buffer to return the requested
array of handles that support Protocol.
@retval EFI_SUCCESS The result array of handles was returned.
@retval EFI_NOT_FOUND No handles match the search.
@retval EFI_OUT_OF_RESOURCES There is not enough pool memory to store the
matching results.
@retval EFI_INVALID_PARAMETER One or more paramters are not valid.
**/
EFI_STATUS
EFIAPI
CoreLocateHandleBuffer (
IN EFI_LOCATE_SEARCH_TYPE SearchType,
IN EFI_GUID *Protocol OPTIONAL,
IN VOID *SearchKey OPTIONAL,
IN OUT UINTN *NumberHandles,
OUT EFI_HANDLE **Buffer
)
{
EFI_STATUS Status;
UINTN BufferSize;
if (NumberHandles == NULL) {
return EFI_INVALID_PARAMETER;
}
if (Buffer == NULL) {
return EFI_INVALID_PARAMETER;
}
BufferSize = 0;
*NumberHandles = 0;
*Buffer = NULL;
Status = CoreLocateHandle (
SearchType,
Protocol,
SearchKey,
&BufferSize,
*Buffer
);
//
// LocateHandleBuffer() returns incorrect status code if SearchType is
// invalid.
//
// Add code to correctly handle expected errors from CoreLocateHandle().
//
if (EFI_ERROR(Status) && Status != EFI_BUFFER_TOO_SMALL) {
if (Status != EFI_INVALID_PARAMETER) {
Status = EFI_NOT_FOUND;
}
return Status;
}
*Buffer = AllocatePool (BufferSize);
if (*Buffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Status = CoreLocateHandle (
SearchType,
Protocol,
SearchKey,
&BufferSize,
*Buffer
);
*NumberHandles = BufferSize / sizeof(EFI_HANDLE);
if (EFI_ERROR(Status)) {
*NumberHandles = 0;
}
return Status;
}
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