be9304f33f
Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Eric Dong <eric.dong@intel.com> Reviewed-by: Gao, Liming <liming,gao@intel.com> git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15563 6f19259b-4bc3-4df7-8a09-765794883524
412 lines
9.5 KiB
C
412 lines
9.5 KiB
C
/** @file
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Utility routines used by boot maintenance modules.
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Copyright (c) 2004 - 2014, Intel Corporation. All rights reserved.<BR>
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This program and the accompanying materials
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are licensed and made available under the terms and conditions of the BSD License
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which accompanies this distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
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WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#include "BootMaint.h"
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/**
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Function opens and returns a file handle to the root directory of a volume.
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@param DeviceHandle A handle for a device
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@return A valid file handle or NULL is returned
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**/
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EFI_FILE_HANDLE
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EfiLibOpenRoot (
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IN EFI_HANDLE DeviceHandle
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)
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{
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EFI_STATUS Status;
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EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Volume;
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EFI_FILE_HANDLE File;
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File = NULL;
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//
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// File the file system interface to the device
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//
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Status = gBS->HandleProtocol (
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DeviceHandle,
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&gEfiSimpleFileSystemProtocolGuid,
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(VOID *) &Volume
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);
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//
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// Open the root directory of the volume
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//
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if (!EFI_ERROR (Status)) {
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Status = Volume->OpenVolume (
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Volume,
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&File
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);
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}
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//
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// Done
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//
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return EFI_ERROR (Status) ? NULL : File;
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}
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/**
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Helper function called as part of the code needed
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to allocate the proper sized buffer for various
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EFI interfaces.
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@param Status Current status
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@param Buffer Current allocated buffer, or NULL
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@param BufferSize Current buffer size needed
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@retval TRUE if the buffer was reallocated and the caller
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should try the API again.
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@retval FALSE The caller should not call this function again.
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**/
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BOOLEAN
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EfiGrowBuffer (
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IN OUT EFI_STATUS *Status,
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IN OUT VOID **Buffer,
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IN UINTN BufferSize
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)
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{
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BOOLEAN TryAgain;
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//
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// If this is an initial request, buffer will be null with a new buffer size
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//
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if ((*Buffer == NULL) && (BufferSize != 0)) {
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*Status = EFI_BUFFER_TOO_SMALL;
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}
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//
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// If the status code is "buffer too small", resize the buffer
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//
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TryAgain = FALSE;
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if (*Status == EFI_BUFFER_TOO_SMALL) {
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if (*Buffer != NULL) {
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FreePool (*Buffer);
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}
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*Buffer = AllocateZeroPool (BufferSize);
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if (*Buffer != NULL) {
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TryAgain = TRUE;
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} else {
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*Status = EFI_OUT_OF_RESOURCES;
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}
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}
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//
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// If there's an error, free the buffer
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//
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if (!TryAgain && EFI_ERROR (*Status) && (*Buffer != NULL)) {
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FreePool (*Buffer);
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*Buffer = NULL;
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}
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return TryAgain;
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}
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/**
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Function returns the value of the specified variable.
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@param Name A Null-terminated Unicode string that is
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the name of the vendor's variable.
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@param VendorGuid A unique identifier for the vendor.
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@return The payload of the variable.
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@retval NULL If the variable can't be read.
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**/
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VOID *
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EfiLibGetVariable (
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IN CHAR16 *Name,
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IN EFI_GUID *VendorGuid
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)
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{
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UINTN VarSize;
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return BdsLibGetVariableAndSize (Name, VendorGuid, &VarSize);
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}
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/**
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Function deletes the variable specified by VarName and VarGuid.
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@param VarName A Null-terminated Unicode string that is
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the name of the vendor's variable.
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@param VarGuid A unique identifier for the vendor.
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@retval EFI_SUCCESS The variable was found and removed
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@retval EFI_UNSUPPORTED The variable store was inaccessible
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@retval EFI_OUT_OF_RESOURCES The temporary buffer was not available
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@retval EFI_NOT_FOUND The variable was not found
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**/
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EFI_STATUS
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EfiLibDeleteVariable (
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IN CHAR16 *VarName,
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IN EFI_GUID *VarGuid
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)
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{
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VOID *VarBuf;
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EFI_STATUS Status;
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VarBuf = EfiLibGetVariable (VarName, VarGuid);
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Status = EFI_NOT_FOUND;
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if (VarBuf != NULL) {
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//
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// Delete variable from Storage
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//
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Status = gRT->SetVariable (
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VarName,
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VarGuid,
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EFI_VARIABLE_BOOTSERVICE_ACCESS | EFI_VARIABLE_RUNTIME_ACCESS | EFI_VARIABLE_NON_VOLATILE,
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0,
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NULL
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);
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//
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// Deleting variable with current variable implementation shouldn't fail.
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//
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ASSERT_EFI_ERROR (Status);
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FreePool (VarBuf);
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}
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return Status;
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}
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/**
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Function gets the file system information from an open file descriptor,
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and stores it in a buffer allocated from pool.
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@param FHand The file handle.
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@return A pointer to a buffer with file information.
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@retval NULL is returned if failed to get Vaolume Label Info.
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**/
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EFI_FILE_SYSTEM_VOLUME_LABEL *
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EfiLibFileSystemVolumeLabelInfo (
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IN EFI_FILE_HANDLE FHand
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)
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{
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EFI_STATUS Status;
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EFI_FILE_SYSTEM_VOLUME_LABEL *Buffer;
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UINTN BufferSize;
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//
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// Initialize for GrowBuffer loop
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//
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Buffer = NULL;
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BufferSize = SIZE_OF_EFI_FILE_SYSTEM_VOLUME_LABEL + 200;
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//
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// Call the real function
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//
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while (EfiGrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) {
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Status = FHand->GetInfo (
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FHand,
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&gEfiFileSystemVolumeLabelInfoIdGuid,
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&BufferSize,
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Buffer
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);
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}
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return Buffer;
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}
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/**
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Duplicate a string.
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@param Src The source.
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@return A new string which is duplicated copy of the source.
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@retval NULL If there is not enough memory.
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**/
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CHAR16 *
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EfiStrDuplicate (
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IN CHAR16 *Src
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)
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{
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CHAR16 *Dest;
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UINTN Size;
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Size = StrSize (Src);
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Dest = AllocateZeroPool (Size);
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ASSERT (Dest != NULL);
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if (Dest != NULL) {
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CopyMem (Dest, Src, Size);
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}
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return Dest;
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}
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/**
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Function gets the file information from an open file descriptor, and stores it
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in a buffer allocated from pool.
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@param FHand File Handle.
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@return A pointer to a buffer with file information or NULL is returned
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**/
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EFI_FILE_INFO *
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EfiLibFileInfo (
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IN EFI_FILE_HANDLE FHand
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)
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{
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EFI_STATUS Status;
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EFI_FILE_INFO *Buffer;
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UINTN BufferSize;
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//
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// Initialize for GrowBuffer loop
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//
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Buffer = NULL;
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BufferSize = SIZE_OF_EFI_FILE_INFO + 200;
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//
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// Call the real function
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//
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while (EfiGrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) {
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Status = FHand->GetInfo (
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FHand,
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&gEfiFileInfoGuid,
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&BufferSize,
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Buffer
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);
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}
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return Buffer;
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}
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/**
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Function is used to determine the number of device path instances
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that exist in a device path.
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@param DevicePath A pointer to a device path data structure.
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@return This function counts and returns the number of device path instances
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in DevicePath.
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**/
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UINTN
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EfiDevicePathInstanceCount (
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IN EFI_DEVICE_PATH_PROTOCOL *DevicePath
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)
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{
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UINTN Count;
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UINTN Size;
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Count = 0;
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while (GetNextDevicePathInstance (&DevicePath, &Size) != NULL) {
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Count += 1;
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}
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return Count;
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}
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/**
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Adjusts the size of a previously allocated buffer.
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@param OldPool - A pointer to the buffer whose size is being adjusted.
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@param OldSize - The size of the current buffer.
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@param NewSize - The size of the new buffer.
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@return The newly allocated buffer.
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@retval NULL Allocation failed.
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**/
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VOID *
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EfiReallocatePool (
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IN VOID *OldPool,
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IN UINTN OldSize,
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IN UINTN NewSize
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)
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{
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VOID *NewPool;
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NewPool = NULL;
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if (NewSize != 0) {
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NewPool = AllocateZeroPool (NewSize);
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}
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if (OldPool != NULL) {
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if (NewPool != NULL) {
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CopyMem (NewPool, OldPool, OldSize < NewSize ? OldSize : NewSize);
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}
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FreePool (OldPool);
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}
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return NewPool;
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}
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/**
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Get a string from the Data Hub record based on
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a device path.
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@param DevPath The device Path.
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@return A string located from the Data Hub records based on
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the device path.
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@retval NULL If failed to get the String from Data Hub.
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**/
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UINT16 *
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EfiLibStrFromDatahub (
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IN EFI_DEVICE_PATH_PROTOCOL *DevPath
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)
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{
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return NULL;
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}
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/**
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Find the first instance of this Protocol
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in the system and return it's interface.
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@param ProtocolGuid Provides the protocol to search for
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@param Interface On return, a pointer to the first interface
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that matches ProtocolGuid
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@retval EFI_SUCCESS A protocol instance matching ProtocolGuid was found
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@retval EFI_NOT_FOUND No protocol instances were found that match ProtocolGuid
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**/
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EFI_STATUS
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EfiLibLocateProtocol (
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IN EFI_GUID *ProtocolGuid,
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OUT VOID **Interface
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)
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{
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EFI_STATUS Status;
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Status = gBS->LocateProtocol (
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ProtocolGuid,
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NULL,
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(VOID **) Interface
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);
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return Status;
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}
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