/*++
Copyright (c) 2006, Intel Corporation
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.
Module Name:
BmLib.c
AgBStract:
Boot Maintainence Helper functions
--*/
#include "BootMaint.h"
EFI_STATUS
EfiLibLocateProtocol (
IN EFI_GUID *ProtocolGuid,
OUT VOID **Interface
)
/*++
Routine Description:
Find the first instance of this Protocol
in the system and return it's interface
Arguments:
ProtocolGuid - Provides the protocol to search for
Interface - On return, a pointer to the first interface
that matches ProtocolGuid
Returns:
EFI_SUCCESS - A protocol instance matching ProtocolGuid was found
EFI_NOT_FOUND - No protocol instances were found that match ProtocolGuid
--*/
{
EFI_STATUS Status;
Status = gBS->LocateProtocol (
ProtocolGuid,
NULL,
Interface
);
return Status;
}
EFI_FILE_HANDLE
EfiLibOpenRoot (
IN EFI_HANDLE DeviceHandle
)
/*++
Routine Description:
Function opens and returns a file handle to the root directory of a volume.
Arguments:
DeviceHandle - A handle for a device
Returns:
A valid file handle or NULL is returned
--*/
{
EFI_STATUS Status;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *Volume;
EFI_FILE_HANDLE File;
File = NULL;
//
// File the file system interface to the device
//
Status = gBS->HandleProtocol (
DeviceHandle,
&gEfiSimpleFileSystemProtocolGuid,
(VOID *) &Volume
);
//
// Open the root directory of the volume
//
if (!EFI_ERROR (Status)) {
Status = Volume->OpenVolume (
Volume,
&File
);
}
//
// Done
//
return EFI_ERROR (Status) ? NULL : File;
}
BOOLEAN
EfiGrowBuffer (
IN OUT EFI_STATUS *Status,
IN OUT VOID **Buffer,
IN UINTN BufferSize
)
/*++
Routine Description:
Helper function called as part of the code needed
to allocate the proper sized buffer for various
EFI interfaces.
Arguments:
Status - Current status
Buffer - Current allocated buffer, or NULL
BufferSize - Current buffer size needed
Returns:
TRUE - if the buffer was reallocated and the caller
should try the API again.
--*/
{
BOOLEAN TryAgain;
//
// If this is an initial request, buffer will be null with a new buffer size
//
if (!*Buffer && BufferSize) {
*Status = EFI_BUFFER_TOO_SMALL;
}
//
// If the status code is "buffer too small", resize the buffer
//
TryAgain = FALSE;
if (*Status == EFI_BUFFER_TOO_SMALL) {
SafeFreePool (*Buffer);
*Buffer = AllocateZeroPool (BufferSize);
if (*Buffer) {
TryAgain = TRUE;
} else {
*Status = EFI_OUT_OF_RESOURCES;
}
}
//
// If there's an error, free the buffer
//
if (!TryAgain && EFI_ERROR (*Status) && *Buffer) {
SafeFreePool (*Buffer);
*Buffer = NULL;
}
return TryAgain;
}
VOID *
EfiLibGetVariable (
IN CHAR16 *Name,
IN EFI_GUID *VendorGuid
)
/*++
Routine Description:
Function returns the value of the specified variable.
Arguments:
Name - A Null-terminated Unicode string that is
the name of the vendor's variable.
VendorGuid - A unique identifier for the vendor.
Returns:
None
--*/
{
UINTN VarSize;
return BdsLibGetVariableAndSize (Name, VendorGuid, &VarSize);
}
EFI_STATUS
EfiLibDeleteVariable (
IN CHAR16 *VarName,
IN EFI_GUID *VarGuid
)
/*++
Routine Description:
Function deletes the variable specified by VarName and VarGuid.
Arguments:
VarName - A Null-terminated Unicode string that is
the name of the vendor's variable.
VendorGuid - A unique identifier for the vendor.
Returns:
EFI_SUCCESS - The variable was found and removed
EFI_UNSUPPORTED - The variable store was inaccessible
EFI_OUT_OF_RESOURCES - The temporary buffer was not available
EFI_NOT_FOUND - The variable was not found
--*/
{
VOID *VarBuf;
EFI_STATUS Status;
VarBuf = EfiLibGetVariable (VarName, VarGuid);
Status = EFI_NOT_FOUND;
if (VarBuf) {
//
// Delete variable from Storage
//
Status = gRT->SetVariable (VarName, VarGuid, VAR_FLAG, 0, NULL);
ASSERT (!EFI_ERROR (Status));
SafeFreePool (VarBuf);
}
return Status;
}
EFI_FILE_SYSTEM_VOLUME_LABEL_INFO *
EfiLibFileSystemVolumeLabelInfo (
IN EFI_FILE_HANDLE FHand
)
/*++
Routine Description:
Function gets the file system information from an open file descriptor,
and stores it in a buffer allocated from pool.
Arguments:
Fhand - A file handle
Returns:
A pointer to a buffer with file information or NULL is returned
--*/
{
EFI_STATUS Status;
EFI_FILE_SYSTEM_VOLUME_LABEL_INFO *Buffer;
UINTN BufferSize;
//
// Initialize for GrowBuffer loop
//
Buffer = NULL;
BufferSize = SIZE_OF_EFI_FILE_SYSTEM_VOLUME_LABEL_INFO + 200;
//
// Call the real function
//
while (EfiGrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) {
Status = FHand->GetInfo (
FHand,
&gEfiFileSystemVolumeLabelInfoIdGuid,
&BufferSize,
Buffer
);
}
return Buffer;
}
CHAR16 *
EfiStrDuplicate (
IN CHAR16 *Src
)
{
CHAR16 *Dest;
UINTN Size;
Size = StrSize (Src);
Dest = AllocateZeroPool (Size);
ASSERT (Dest != NULL);
if (Dest) {
CopyMem (Dest, Src, Size);
}
return Dest;
}
EFI_FILE_INFO *
EfiLibFileInfo (
IN EFI_FILE_HANDLE FHand
)
/*++
Routine Description:
Function gets the file information from an open file descriptor, and stores it
in a buffer allocated from pool.
Arguments:
Fhand - A file handle
Returns:
A pointer to a buffer with file information or NULL is returned
--*/
{
EFI_STATUS Status;
EFI_FILE_INFO *Buffer;
UINTN BufferSize;
//
// Initialize for GrowBuffer loop
//
Buffer = NULL;
BufferSize = SIZE_OF_EFI_FILE_INFO + 200;
//
// Call the real function
//
while (EfiGrowBuffer (&Status, (VOID **) &Buffer, BufferSize)) {
Status = FHand->GetInfo (
FHand,
&gEfiFileInfoGuid,
&BufferSize,
Buffer
);
}
return Buffer;
}
UINTN
EfiDevicePathInstanceCount (
IN EFI_DEVICE_PATH_PROTOCOL *DevicePath
)
/*++
Routine Description:
Function is used to determine the number of device path instances
that exist in a device path.
Arguments:
DevicePath - A pointer to a device path data structure.
Returns:
This function counts and returns the number of device path instances
in DevicePath.
--*/
{
UINTN Count;
UINTN Size;
Count = 0;
while (GetNextDevicePathInstance (&DevicePath, &Size)) {
Count += 1;
}
return Count;
}
VOID *
EfiReallocatePool (
IN VOID *OldPool,
IN UINTN OldSize,
IN UINTN NewSize
)
/*++
Routine Description:
Adjusts the size of a previously allocated buffer.
Arguments:
OldPool - A pointer to the buffer whose size is being adjusted.
OldSize - The size of the current buffer.
NewSize - The size of the new buffer.
Returns:
EFI_SUCEESS - The requested number of bytes were allocated.
EFI_OUT_OF_RESOURCES - The pool requested could not be allocated.
EFI_INVALID_PARAMETER - The buffer was invalid.
--*/
{
VOID *NewPool;
NewPool = NULL;
if (NewSize) {
NewPool = AllocateZeroPool (NewSize);
}
if (OldPool) {
if (NewPool) {
CopyMem (NewPool, OldPool, OldSize < NewSize ? OldSize : NewSize);
}
SafeFreePool (OldPool);
}
return NewPool;
}
EFI_STATUS
EfiLibGetStringFromToken (
IN EFI_GUID *ProducerGuid,
IN STRING_REF Token,
OUT CHAR16 **String
)
/*++
Routine Description:
Acquire the string associated with the ProducerGuid and return it.
Arguments:
ProducerGuid - The Guid to search the HII database for
Token - The token value of the string to extract
String - The string that is extracted
Returns:
EFI_SUCCESS - Buffer filled with the requested forms. BufferLength
was updated.
EFI_BUFFER_TOO_SMALL - The buffer provided was not large enough to allow the form to be stored.
--*/
{
EFI_STATUS Status;
UINT16 HandleBufferLength;
EFI_HII_HANDLE *HiiHandleBuffer;
UINTN StringBufferLength;
UINTN NumberOfHiiHandles;
UINTN Index;
UINT16 Length;
EFI_GUID HiiGuid;
EFI_HII_PROTOCOL *Hii;
//
// Initialize params.
//
HandleBufferLength = 0;
HiiHandleBuffer = NULL;
Status = gBS->LocateProtocol (
&gEfiHiiProtocolGuid,
NULL,
(VOID**) &Hii
);
if (EFI_ERROR (Status)) {
*String = NULL;
return Status;
}
//
// Get all the Hii handles
//
Status = BdsLibGetHiiHandles (Hii, &HandleBufferLength, &HiiHandleBuffer);
ASSERT_EFI_ERROR (Status);
//
// Get the Hii Handle that matches the StructureNode->ProducerName
//
NumberOfHiiHandles = HandleBufferLength / sizeof (EFI_HII_HANDLE);
for (Index = 0; Index < NumberOfHiiHandles; Index++) {
Length = 0;
Status = ExtractDataFromHiiHandle (
HiiHandleBuffer[Index],
&Length,
NULL,
&HiiGuid
);
if (CompareGuid (ProducerGuid, &HiiGuid)) {
break;
}
}
//
// Find the string based on the current language
//
StringBufferLength = 0x100;
*String = AllocateZeroPool (0x100);
ASSERT (*String != NULL);
Status = Hii->GetString (
Hii,
HiiHandleBuffer[Index],
Token,
FALSE,
NULL,
&StringBufferLength,
*String
);
gBS->FreePool (HiiHandleBuffer);
return Status;
}
BOOLEAN
TimeCompare (
IN EFI_TIME *FirstTime,
IN EFI_TIME *SecondTime
)
/*++
Routine Description:
Compare two EFI_TIME data.
Arguments:
FirstTime - A pointer to the first EFI_TIME data.
SecondTime - A pointer to the second EFI_TIME data.
Returns:
TRUE The FirstTime is not later than the SecondTime.
FALSE The FirstTime is later than the SecondTime.
--*/
{
if (FirstTime->Year != SecondTime->Year) {
return (BOOLEAN) (FirstTime->Year < SecondTime->Year);
} else if (FirstTime->Month != SecondTime->Month) {
return (BOOLEAN) (FirstTime->Month < SecondTime->Month);
} else if (FirstTime->Day != SecondTime->Day) {
return (BOOLEAN) (FirstTime->Day < SecondTime->Day);
} else if (FirstTime->Hour != SecondTime->Hour) {
return (BOOLEAN) (FirstTime->Hour < SecondTime->Hour);
} else if (FirstTime->Minute != SecondTime->Minute) {
return (BOOLEAN) (FirstTime->Minute < FirstTime->Minute);
} else if (FirstTime->Second != SecondTime->Second) {
return (BOOLEAN) (FirstTime->Second < SecondTime->Second);
}
return (BOOLEAN) (FirstTime->Nanosecond <= SecondTime->Nanosecond);
}
UINT16 *
EfiLibStrFromDatahub (
IN EFI_DEVICE_PATH_PROTOCOL *DevPath
)
{
EFI_STATUS Status;
UINT16 *Desc;
EFI_DATA_HUB_PROTOCOL *Datahub;
UINT64 Count;
EFI_DATA_RECORD_HEADER *Record;
EFI_SUBCLASS_TYPE1_HEADER *DataHdr;
EFI_GUID MiscGuid = EFI_MISC_SUBCLASS_GUID;
EFI_MISC_ONBOARD_DEVICE_DATA *ob;
EFI_MISC_PORT_INTERNAL_CONNECTOR_DESIGNATOR_DATA *Port;
EFI_TIME CurTime;
Status = gBS->LocateProtocol (
&gEfiDataHubProtocolGuid,
NULL,
(VOID**) &Datahub
);
if (EFI_ERROR (Status)) {
return NULL;
}
Status = gRT->GetTime (&CurTime, NULL);
if (EFI_ERROR (Status)) {
return NULL;
}
Count = 0;
do {
Status = Datahub->GetNextRecord (Datahub, &Count, NULL, &Record);
if (EFI_ERROR (Status)) {
break;
}
if (Record->DataRecordClass == EFI_DATA_RECORD_CLASS_DATA && CompareGuid (&Record->DataRecordGuid, &MiscGuid)) {
//
// This record is what we need
//
DataHdr = (EFI_SUBCLASS_TYPE1_HEADER *) (Record + 1);
if (EFI_MISC_ONBOARD_DEVICE_RECORD_NUMBER == DataHdr->RecordType) {
ob = (EFI_MISC_ONBOARD_DEVICE_DATA *) (DataHdr + 1);
if (BdsLibMatchDevicePaths ((EFI_DEVICE_PATH_PROTOCOL *) &ob->OnBoardDevicePath, DevPath)) {
EfiLibGetStringFromToken (&Record->ProducerName, ob->OnBoardDeviceDescription, &Desc);
return Desc;
}
}
if (EFI_MISC_PORT_INTERNAL_CONNECTOR_DESIGNATOR_RECORD_NUMBER == DataHdr->RecordType) {
Port = (EFI_MISC_PORT_INTERNAL_CONNECTOR_DESIGNATOR_DATA *) (DataHdr + 1);
if (BdsLibMatchDevicePaths ((EFI_DEVICE_PATH_PROTOCOL *) &Port->PortPath, DevPath)) {
EfiLibGetStringFromToken (&Record->ProducerName, Port->PortExternalConnectorDesignator, &Desc);
return Desc;
}
}
}
} while (TimeCompare (&Record->LogTime, &CurTime) && Count != 0);
return NULL;
}