mirror of https://github.com/acidanthera/audk.git
564 lines
13 KiB
C
564 lines
13 KiB
C
/*++
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Copyright (c) 2004 - 2008, Intel Corporation
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All rights reserved. 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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Module Name:
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bmlib.c
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AgBStract:
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Boot Maintainence Helper functions
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--*/
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#include "BootMaint.h"
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VOID *
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EfiAllocateZeroPool (
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IN UINTN Size
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)
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/*++
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Routine Description:
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Wrap original AllocatePool gBS call
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and ZeroMem gBS call into a single
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function in order to decrease code length
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Arguments:
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Returns:
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Valid pointer to the allocated buffer
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Null for failure
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--*/
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{
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EFI_STATUS Status;
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VOID *Ptr;
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Status = gBS->AllocatePool (EfiBootServicesData, Size, &Ptr);
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if (EFI_ERROR (Status)) {
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Ptr = NULL;
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return Ptr;
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}
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ZeroMem (Ptr, Size);
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return Ptr;
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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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Routine Description:
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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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Arguments:
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ProtocolGuid - Provides the protocol to search for
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Interface - On return, a pointer to the first interface
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that matches ProtocolGuid
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Returns:
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EFI_SUCCESS - A protocol instance matching ProtocolGuid was found
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EFI_NOT_FOUND - No protocol instances were found that match ProtocolGuid
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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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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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Routine Description:
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Function opens and returns a file handle to the root directory of a volume.
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Arguments:
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DeviceHandle - A handle for a device
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Returns:
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A valid file handle or NULL is returned
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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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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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Routine Description:
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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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Arguments:
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Status - Current status
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Buffer - Current allocated buffer, or NULL
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BufferSize - Current buffer size needed
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Returns:
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TRUE - if the buffer was reallocated and the caller
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should try the API again.
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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 && BufferSize) {
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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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SafeFreePool (*Buffer);
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*Buffer = EfiAllocateZeroPool (BufferSize);
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if (*Buffer) {
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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) {
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SafeFreePool (*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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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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Routine Description:
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Function returns the value of the specified variable.
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Arguments:
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Name - A Null-terminated Unicode string that is
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the name of the vendor's variable.
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VendorGuid - A unique identifier for the vendor.
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Returns:
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None
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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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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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Routine Description:
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Function deletes the variable specified by VarName and VarGuid.
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Arguments:
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VarName - A Null-terminated Unicode string that is
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the name of the vendor's variable.
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VendorGuid - A unique identifier for the vendor.
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Returns:
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EFI_SUCCESS - The variable was found and removed
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EFI_UNSUPPORTED - The variable store was inaccessible
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EFI_OUT_OF_RESOURCES - The temporary buffer was not available
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EFI_NOT_FOUND - The variable was not found
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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) {
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//
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// Delete variable from Storage
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//
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Status = gRT->SetVariable (VarName, VarGuid, VAR_FLAG, 0, NULL);
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ASSERT (!EFI_ERROR (Status));
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SafeFreePool (VarBuf);
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}
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return Status;
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}
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EFI_FILE_SYSTEM_VOLUME_LABEL_INFO *
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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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Routine Description:
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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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Arguments:
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Fhand - A file handle
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Returns:
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A pointer to a buffer with file information or NULL is returned
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--*/
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{
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EFI_STATUS Status;
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EFI_FILE_SYSTEM_VOLUME_LABEL_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_SYSTEM_VOLUME_LABEL_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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&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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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 = EfiAllocateZeroPool (Size);
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ASSERT (Dest != NULL);
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if (Dest) {
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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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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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Routine Description:
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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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Arguments:
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Fhand - A file handle
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Returns:
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A pointer to a buffer with file information or NULL is returned
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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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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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Routine Description:
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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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Arguments:
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DevicePath - A pointer to a device path data structure.
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Returns:
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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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{
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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)) {
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Count += 1;
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}
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return Count;
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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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Routine Description:
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Adjusts the size of a previously allocated buffer.
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Arguments:
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OldPool - A pointer to the buffer whose size is being adjusted.
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OldSize - The size of the current buffer.
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NewSize - The size of the new buffer.
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Returns:
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EFI_SUCEESS - The requested number of bytes were allocated.
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EFI_OUT_OF_RESOURCES - The pool requested could not be allocated.
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EFI_INVALID_PARAMETER - The buffer was invalid.
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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) {
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NewPool = EfiAllocateZeroPool (NewSize);
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}
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if (OldPool) {
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if (NewPool) {
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CopyMem (NewPool, OldPool, OldSize < NewSize ? OldSize : NewSize);
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}
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SafeFreePool (OldPool);
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}
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return NewPool;
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}
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BOOLEAN
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TimeCompare (
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IN EFI_TIME *FirstTime,
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IN EFI_TIME *SecondTime
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)
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/*++
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Routine Description:
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Compare two EFI_TIME data.
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Arguments:
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FirstTime - A pointer to the first EFI_TIME data.
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SecondTime - A pointer to the second EFI_TIME data.
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Returns:
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TRUE The FirstTime is not later than the SecondTime.
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FALSE The FirstTime is later than the SecondTime.
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--*/
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{
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if (FirstTime->Year != SecondTime->Year) {
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return (BOOLEAN) (FirstTime->Year < SecondTime->Year);
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} else if (FirstTime->Month != SecondTime->Month) {
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return (BOOLEAN) (FirstTime->Month < SecondTime->Month);
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} else if (FirstTime->Day != SecondTime->Day) {
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return (BOOLEAN) (FirstTime->Day < SecondTime->Day);
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} else if (FirstTime->Hour != SecondTime->Hour) {
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return (BOOLEAN) (FirstTime->Hour < SecondTime->Hour);
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} else if (FirstTime->Minute != SecondTime->Minute) {
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return (BOOLEAN) (FirstTime->Minute < FirstTime->Minute);
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} else if (FirstTime->Second != SecondTime->Second) {
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return (BOOLEAN) (FirstTime->Second < SecondTime->Second);
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}
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return (BOOLEAN) (FirstTime->Nanosecond <= SecondTime->Nanosecond);
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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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EFI_STATUS Status;
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UINT16 *Desc;
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EFI_DATA_HUB_PROTOCOL *Datahub;
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UINT64 Count;
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EFI_DATA_RECORD_HEADER *Record;
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EFI_SUBCLASS_TYPE1_HEADER *DataHdr;
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EFI_GUID MiscGuid = EFI_MISC_SUBCLASS_GUID;
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EFI_MISC_ONBOARD_DEVICE_DATA *ob;
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EFI_MISC_PORT_INTERNAL_CONNECTOR_DESIGNATOR_DATA *Port;
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EFI_TIME CurTime;
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Status = gBS->LocateProtocol (
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&gEfiDataHubProtocolGuid,
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NULL,
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(VOID **) &Datahub
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);
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if (EFI_ERROR (Status)) {
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return NULL;
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}
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Status = gRT->GetTime (&CurTime, NULL);
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if (EFI_ERROR (Status)) {
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return NULL;
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}
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Count = 0;
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do {
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Status = Datahub->GetNextRecord (Datahub, &Count, NULL, &Record);
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if (EFI_ERROR (Status)) {
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break;
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}
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if (Record->DataRecordClass == EFI_DATA_RECORD_CLASS_DATA && CompareGuid (&Record->DataRecordGuid, &MiscGuid)) {
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//
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// This record is what we need
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//
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DataHdr = (EFI_SUBCLASS_TYPE1_HEADER *) (Record + 1);
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if (EFI_MISC_ONBOARD_DEVICE_RECORD_NUMBER == DataHdr->RecordType) {
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ob = (EFI_MISC_ONBOARD_DEVICE_DATA *) (DataHdr + 1);
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if (BdsLibMatchDevicePaths ((EFI_DEVICE_PATH_PROTOCOL *) &ob->OnBoardDevicePath, DevPath)) {
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GetProducerString (&Record->ProducerName, ob->OnBoardDeviceDescription, &Desc);
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return Desc;
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}
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}
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if (EFI_MISC_PORT_INTERNAL_CONNECTOR_DESIGNATOR_RECORD_NUMBER == DataHdr->RecordType) {
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Port = (EFI_MISC_PORT_INTERNAL_CONNECTOR_DESIGNATOR_DATA *) (DataHdr + 1);
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if (BdsLibMatchDevicePaths ((EFI_DEVICE_PATH_PROTOCOL *) &Port->PortPath, DevPath)) {
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GetProducerString (&Record->ProducerName, Port->PortExternalConnectorDesignator, &Desc);
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return Desc;
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}
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}
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}
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} while (TimeCompare (&Record->LogTime, &CurTime) && Count != 0);
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return NULL;
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}
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