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audk/UefiPayloadPkg/FvbRuntimeDxe/FvbService.c

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/** @file
Firmware Volume Block Driver to provide FVB service.
Copyright (c) 2014 - 2021, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "FvbService.h"
//
// Global variable for this FVB driver which contains
// the private data of all firmware volume block instances
//
FWB_GLOBAL mFvbModuleGlobal;
FV_MEMMAP_DEVICE_PATH mFvMemmapDevicePathTemplate = {
{
{
HARDWARE_DEVICE_PATH,
HW_MEMMAP_DP,
{
(UINT8)(sizeof (MEMMAP_DEVICE_PATH)),
(UINT8)(sizeof (MEMMAP_DEVICE_PATH) >> 8)
}
},
EfiMemoryMappedIO,
(EFI_PHYSICAL_ADDRESS)0,
(EFI_PHYSICAL_ADDRESS)0,
},
{
END_DEVICE_PATH_TYPE,
END_ENTIRE_DEVICE_PATH_SUBTYPE,
{
END_DEVICE_PATH_LENGTH,
0
}
}
};
FV_PIWG_DEVICE_PATH mFvPIWGDevicePathTemplate = {
{
{
MEDIA_DEVICE_PATH,
MEDIA_PIWG_FW_VOL_DP,
{
(UINT8)(sizeof (MEDIA_FW_VOL_DEVICE_PATH)),
(UINT8)(sizeof (MEDIA_FW_VOL_DEVICE_PATH) >> 8)
}
},
{ 0 }
},
{
END_DEVICE_PATH_TYPE,
END_ENTIRE_DEVICE_PATH_SUBTYPE,
{
END_DEVICE_PATH_LENGTH,
0
}
}
};
EFI_FW_VOL_BLOCK_DEVICE mFvbDeviceTemplate = {
FVB_DEVICE_SIGNATURE,
NULL,
0, // Instance
{
FvbProtocolGetAttributes,
FvbProtocolSetAttributes,
FvbProtocolGetPhysicalAddress,
FvbProtocolGetBlockSize,
FvbProtocolRead,
FvbProtocolWrite,
FvbProtocolEraseBlocks,
NULL
} // FwVolBlockInstance
};
/**
Get the pointer to EFI_FW_VOL_INSTANCE from the buffer pointed
by mFvbModuleGlobal.FvInstance based on a index.
Each EFI_FW_VOL_INSTANCE is with variable length as
we have a block map at the end of the EFI_FIRMWARE_VOLUME_HEADER.
@param[in] Instance The index of the EFI_FW_VOL_INSTANCE.
@return A pointer to EFI_FW_VOL_INSTANCE.
**/
EFI_FW_VOL_INSTANCE *
GetFvbInstance (
IN UINTN Instance
)
{
EFI_FW_VOL_INSTANCE *FwhRecord;
if ( Instance >= mFvbModuleGlobal.NumFv ) {
ASSERT_EFI_ERROR (EFI_INVALID_PARAMETER);
return NULL;
}
//
// Find the right instance of the FVB private data
//
FwhRecord = mFvbModuleGlobal.FvInstance;
while ( Instance > 0 ) {
FwhRecord = (EFI_FW_VOL_INSTANCE *)((UINTN)((UINT8 *)FwhRecord) +
FwhRecord->VolumeHeader.HeaderLength +
(sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER)));
Instance--;
}
return FwhRecord;
}
/**
Get the EFI_FVB_ATTRIBUTES_2 of a FV.
@param[in] Instance The index of the EFI_FW_VOL_INSTANCE.
@retval EFI_FVB_ATTRIBUTES_2 of the FV identified by Instance.
**/
STATIC
EFI_FVB_ATTRIBUTES_2
FvbGetVolumeAttributes (
IN UINTN Instance
)
{
EFI_FW_VOL_INSTANCE *FwInstance;
FwInstance = GetFvbInstance (Instance);
ASSERT (FwInstance != NULL);
if (FwInstance == NULL) {
return 0;
}
return FwInstance->VolumeHeader.Attributes;
}
/**
Retrieves the starting address of an LBA in an FV. It also
return a few other attribut of the FV.
@param[in] Instance The index of the EFI_FW_VOL_INSTANCE.
@param[in] Lba The logical block address
@param[out] LbaAddress On output, contains the physical starting address
of the Lba
@param[out] LbaLength On output, contains the length of the block
@param[out] NumOfBlocks A pointer to a caller allocated UINTN in which the
number of consecutive blocks starting with Lba is
returned. All blocks in this range have a size of
BlockSize
@retval EFI_SUCCESS Successfully returns
@retval EFI_INVALID_PARAMETER Instance not found
**/
STATIC
EFI_STATUS
FvbGetLbaAddress (
IN UINTN Instance,
IN EFI_LBA Lba,
OUT UINTN *LbaAddress,
OUT UINTN *LbaLength,
OUT UINTN *NumOfBlocks
)
{
UINT32 NumBlocks;
UINT32 BlockLength;
UINTN Offset;
EFI_LBA StartLba;
EFI_LBA NextLba;
EFI_FW_VOL_INSTANCE *FwhInstance;
EFI_FV_BLOCK_MAP_ENTRY *BlockMap;
//
// Find the right instance of the FVB private data
//
FwhInstance = GetFvbInstance (Instance);
if (FwhInstance == NULL) {
return EFI_INVALID_PARAMETER;
}
StartLba = 0;
Offset = 0;
BlockMap = &FwhInstance->VolumeHeader.BlockMap[0];
ASSERT (BlockMap != NULL);
//
// Parse the blockmap of the FV to find which map entry the Lba belongs to
//
while (TRUE) {
if ( BlockMap != NULL) {
NumBlocks = BlockMap->NumBlocks;
BlockLength = BlockMap->Length;
}
if ((NumBlocks == 0) || (BlockLength == 0)) {
return EFI_INVALID_PARAMETER;
}
NextLba = StartLba + NumBlocks;
//
// The map entry found
//
if ((Lba >= StartLba) && (Lba < NextLba)) {
Offset = Offset + (UINTN)MultU64x32 ((Lba - StartLba), BlockLength);
if (LbaAddress != NULL) {
*LbaAddress = FwhInstance->FvBase + Offset;
}
if (LbaLength != NULL) {
*LbaLength = BlockLength;
}
if (NumOfBlocks != NULL) {
*NumOfBlocks = (UINTN)(NextLba - Lba);
}
return EFI_SUCCESS;
}
StartLba = NextLba;
Offset = Offset + NumBlocks * BlockLength;
BlockMap++;
}
}
/**
Reads specified number of bytes into a buffer from the specified block
@param[in] Instance The FV instance to be read from
@param[in] Lba The logical block address to be read from
@param[in] BlockOffset Offset into the block at which to begin reading
@param[in, out] NumBytes Pointer that on input contains the total size of
the buffer. On output, it contains the total number
of bytes read
@param[in] Buffer Pointer to a caller allocated buffer that will be
used to hold the data read
@retval EFI_SUCCESS The firmware volume was read successfully and
contents are in Buffer
@retval EFI_BAD_BUFFER_SIZE Read attempted across a LBA boundary. On output,
NumBytes contains the total number of bytes returned
in Buffer
@retval EFI_ACCESS_DENIED The firmware volume is in the ReadDisabled state
@retval EFI_DEVICE_ERROR The block device is not functioning correctly and
could not be read
@retval EFI_INVALID_PARAMETER Instance not found, or NumBytes, Buffer are NULL
**/
STATIC
EFI_STATUS
FvbReadBlock (
IN UINTN Instance,
IN EFI_LBA Lba,
IN UINTN BlockOffset,
IN OUT UINTN *NumBytes,
IN UINT8 *Buffer
)
{
EFI_FVB_ATTRIBUTES_2 Attributes;
UINTN LbaAddress;
UINTN LbaLength;
EFI_STATUS Status;
EFI_STATUS ReadStatus;
if ((NumBytes == NULL) || (Buffer == NULL)) {
return (EFI_INVALID_PARAMETER);
}
if (*NumBytes == 0) {
return (EFI_INVALID_PARAMETER);
}
Status = FvbGetLbaAddress (Instance, Lba, &LbaAddress, &LbaLength, NULL);
if (EFI_ERROR (Status)) {
return Status;
}
Attributes = FvbGetVolumeAttributes (Instance);
if ((Attributes & EFI_FVB2_READ_STATUS) == 0) {
return (EFI_ACCESS_DENIED);
}
if (BlockOffset > LbaLength) {
return (EFI_INVALID_PARAMETER);
}
if (LbaLength < (*NumBytes + BlockOffset)) {
*NumBytes = (UINT32)(LbaLength - BlockOffset);
Status = EFI_BAD_BUFFER_SIZE;
}
ReadStatus = LibFvbFlashDeviceRead (LbaAddress + BlockOffset, NumBytes, Buffer);
if (EFI_ERROR (ReadStatus)) {
return ReadStatus;
}
return Status;
}
/**
Writes specified number of bytes from the input buffer to the block
@param[in] Instance The FV instance to be written to
@param[in] Lba The starting logical block index to write to
@param[in] BlockOffset Offset into the block at which to begin writing
@param[in, out] NumBytes Pointer that on input contains the total size of
the buffer. On output, it contains the total number
of bytes actually written
@param[in] Buffer Pointer to a caller allocated buffer that contains
the source for the write
@retval EFI_SUCCESS The firmware volume was written successfully
@retval EFI_BAD_BUFFER_SIZE Write attempted across a LBA boundary. On output,
NumBytes contains the total number of bytes
actually written
@retval EFI_ACCESS_DENIED The firmware volume is in the WriteDisabled state
@retval EFI_DEVICE_ERROR The block device is not functioning correctly and
could not be written
@retval EFI_INVALID_PARAMETER Instance not found, or NumBytes, Buffer are NULL
**/
EFI_STATUS
FvbWriteBlock (
IN UINTN Instance,
IN EFI_LBA Lba,
IN UINTN BlockOffset,
IN OUT UINTN *NumBytes,
IN UINT8 *Buffer
)
{
EFI_FVB_ATTRIBUTES_2 Attributes;
UINTN LbaAddress;
UINTN LbaLength;
EFI_STATUS Status;
if ((NumBytes == NULL) || (Buffer == NULL)) {
return (EFI_INVALID_PARAMETER);
}
if (*NumBytes == 0) {
return (EFI_INVALID_PARAMETER);
}
Status = FvbGetLbaAddress (Instance, Lba, &LbaAddress, &LbaLength, NULL);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Check if the FV is write enabled
//
Attributes = FvbGetVolumeAttributes (Instance);
if ((Attributes & EFI_FVB2_WRITE_STATUS) == 0) {
return EFI_ACCESS_DENIED;
}
//
// Perform boundary checks and adjust NumBytes
//
if (BlockOffset > LbaLength) {
return EFI_INVALID_PARAMETER;
}
if ( LbaLength < (*NumBytes + BlockOffset)) {
DEBUG ((
DEBUG_ERROR,
"FvWriteBlock: Reducing Numbytes from 0x%x to 0x%x\n",
*NumBytes,
(UINT32)(LbaLength - BlockOffset)
));
*NumBytes = (UINT32)(LbaLength - BlockOffset);
return EFI_BAD_BUFFER_SIZE;
}
LibFvbFlashDeviceBlockLock (LbaAddress, LbaLength, FALSE);
Status = LibFvbFlashDeviceWrite (LbaAddress + BlockOffset, NumBytes, Buffer);
LibFvbFlashDeviceBlockLock (LbaAddress, LbaLength, TRUE);
WriteBackInvalidateDataCacheRange ((VOID *)(LbaAddress + BlockOffset), *NumBytes);
return Status;
}
/**
Erases and initializes a firmware volume block
@param[in] Instance The FV instance to be erased
@param[in] Lba The logical block index to be erased
@retval EFI_SUCCESS The erase request was successfully completed
@retval EFI_ACCESS_DENIED The firmware volume is in the WriteDisabled state
@retval EFI_DEVICE_ERROR The block device is not functioning correctly and
could not be written. Firmware device may have been
partially erased
@retval EFI_INVALID_PARAMETER Instance not found
**/
EFI_STATUS
FvbEraseBlock (
IN UINTN Instance,
IN EFI_LBA Lba
)
{
EFI_FVB_ATTRIBUTES_2 Attributes;
UINTN LbaAddress;
UINTN LbaLength;
EFI_STATUS Status;
//
// Check if the FV is write enabled
//
Attributes = FvbGetVolumeAttributes (Instance);
if ((Attributes & EFI_FVB2_WRITE_STATUS) == 0) {
return (EFI_ACCESS_DENIED);
}
//
// Get the starting address of the block for erase.
//
Status = FvbGetLbaAddress (Instance, Lba, &LbaAddress, &LbaLength, NULL);
if (EFI_ERROR (Status)) {
return Status;
}
LibFvbFlashDeviceBlockLock (LbaAddress, LbaLength, FALSE);
Status = LibFvbFlashDeviceBlockErase (LbaAddress, LbaLength);
LibFvbFlashDeviceBlockLock (LbaAddress, LbaLength, TRUE);
WriteBackInvalidateDataCacheRange ((VOID *)LbaAddress, LbaLength);
return Status;
}
/**
Modifies the current settings of the firmware volume according to the
input parameter, and returns the new setting of the volume
@param[in] Instance The FV instance whose attributes is going to be
modified
@param[in, out] Attributes On input, it is a pointer to EFI_FVB_ATTRIBUTES_2
containing the desired firmware volume settings.
On successful return, it contains the new settings
of the firmware volume
@retval EFI_SUCCESS Successfully returns
@retval EFI_ACCESS_DENIED The volume setting is locked and cannot be modified
@retval EFI_INVALID_PARAMETER Instance not found, or The attributes requested are
in conflict with the capabilities as declared in the
firmware volume header
**/
STATIC
EFI_STATUS
FvbSetVolumeAttributes (
IN UINTN Instance,
IN OUT EFI_FVB_ATTRIBUTES_2 *Attributes
)
{
EFI_FW_VOL_INSTANCE *FwhInstance;
EFI_FVB_ATTRIBUTES_2 OldAttributes;
EFI_FVB_ATTRIBUTES_2 *AttribPtr;
EFI_FVB_ATTRIBUTES_2 UnchangedAttributes;
UINT32 Capabilities;
UINT32 OldStatus;
UINT32 NewStatus;
//
// Find the right instance of the FVB private data
//
FwhInstance = GetFvbInstance (Instance);
if (FwhInstance == NULL) {
return EFI_INVALID_PARAMETER;
}
AttribPtr = (EFI_FVB_ATTRIBUTES_2 *)&(FwhInstance->VolumeHeader.Attributes);
ASSERT (AttribPtr != NULL);
if ( AttribPtr == NULL) {
return EFI_INVALID_PARAMETER;
}
OldAttributes = *AttribPtr;
Capabilities = OldAttributes & EFI_FVB2_CAPABILITIES;
OldStatus = OldAttributes & EFI_FVB2_STATUS;
NewStatus = *Attributes & EFI_FVB2_STATUS;
UnchangedAttributes = EFI_FVB2_READ_DISABLED_CAP | \
EFI_FVB2_READ_ENABLED_CAP | \
EFI_FVB2_WRITE_DISABLED_CAP | \
EFI_FVB2_WRITE_ENABLED_CAP | \
EFI_FVB2_LOCK_CAP | \
EFI_FVB2_STICKY_WRITE | \
EFI_FVB2_MEMORY_MAPPED | \
EFI_FVB2_ERASE_POLARITY | \
EFI_FVB2_READ_LOCK_CAP | \
EFI_FVB2_WRITE_LOCK_CAP | \
EFI_FVB2_ALIGNMENT;
//
// Some attributes of FV is read only can *not* be set
//
if ((OldAttributes & UnchangedAttributes) ^ (*Attributes & UnchangedAttributes)) {
return EFI_INVALID_PARAMETER;
}
//
// If firmware volume is locked, no status bit can be updated
//
if ((OldAttributes & EFI_FVB2_LOCK_STATUS) != 0) {
if ((OldStatus ^ NewStatus) != 0) {
return EFI_ACCESS_DENIED;
}
}
//
// Test read disable
//
if ((Capabilities & EFI_FVB2_READ_DISABLED_CAP) == 0) {
if ((NewStatus & EFI_FVB2_READ_STATUS) == 0) {
return EFI_INVALID_PARAMETER;
}
}
//
// Test read enable
//
if ((Capabilities & EFI_FVB2_READ_ENABLED_CAP) == 0) {
if ((NewStatus & EFI_FVB2_READ_STATUS) != 0) {
return EFI_INVALID_PARAMETER;
}
}
//
// Test write disable
//
if ((Capabilities & EFI_FVB2_WRITE_DISABLED_CAP) == 0) {
if ((NewStatus & EFI_FVB2_WRITE_STATUS) == 0) {
return EFI_INVALID_PARAMETER;
}
}
//
// Test write enable
//
if ((Capabilities & EFI_FVB2_WRITE_ENABLED_CAP) == 0) {
if ((NewStatus & EFI_FVB2_WRITE_STATUS) != 0) {
return EFI_INVALID_PARAMETER;
}
}
//
// Test lock
//
if ((Capabilities & EFI_FVB2_LOCK_CAP) == 0) {
if ((NewStatus & EFI_FVB2_LOCK_STATUS) != 0) {
return EFI_INVALID_PARAMETER;
}
}
*AttribPtr = (*AttribPtr) & (0xFFFFFFFF & (~EFI_FVB2_STATUS));
*AttribPtr = (*AttribPtr) | NewStatus;
*Attributes = *AttribPtr;
return EFI_SUCCESS;
}
/**
Retrieves the physical address of the device.
@param[in] This A pointer to EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL.
@param[out] Address Output buffer containing the address.
@retval EFI_SUCCESS The function always return successfully.
@retval EFI_INVALID_PARAMETER Instance not found.
**/
EFI_STATUS
EFIAPI
FvbProtocolGetPhysicalAddress (
IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,
OUT EFI_PHYSICAL_ADDRESS *Address
)
{
EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
EFI_FW_VOL_INSTANCE *FwhInstance;
FvbDevice = FVB_DEVICE_FROM_THIS (This);
FwhInstance = GetFvbInstance (FvbDevice->Instance);
if (FwhInstance == NULL) {
return EFI_INVALID_PARAMETER;
}
*Address = FwhInstance->FvBase;
return EFI_SUCCESS;
}
/**
Retrieve the size of a logical block
@param[in] This Calling context
@param[in] Lba Indicates which block to return the size for.
@param[out] BlockSize A pointer to a caller allocated UINTN in which
the size of the block is returned
@param[out] NumOfBlocks A pointer to a caller allocated UINTN in which the
number of consecutive blocks starting with Lba is
returned. All blocks in this range have a size of
BlockSize
@retval EFI_SUCCESS The function always return successfully.
**/
EFI_STATUS
EFIAPI
FvbProtocolGetBlockSize (
IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,
IN EFI_LBA Lba,
OUT UINTN *BlockSize,
OUT UINTN *NumOfBlocks
)
{
EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
FvbDevice = FVB_DEVICE_FROM_THIS (This);
return FvbGetLbaAddress (FvbDevice->Instance, Lba, NULL, BlockSize, NumOfBlocks);
}
/**
Retrieves Volume attributes. No polarity translations are done.
@param[in] This Calling context
@param[out] Attributes Output buffer which contains attributes
@retval EFI_SUCCESS The function always return successfully.
**/
EFI_STATUS
EFIAPI
FvbProtocolGetAttributes (
IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,
OUT EFI_FVB_ATTRIBUTES_2 *Attributes
)
{
EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
FvbDevice = FVB_DEVICE_FROM_THIS (This);
*Attributes = FvbGetVolumeAttributes (FvbDevice->Instance);
return EFI_SUCCESS;
}
/**
Sets Volume attributes. No polarity translations are done.
@param[in] This Calling context
@param[in, out] Attributes Output buffer which contains attributes
@retval EFI_SUCCESS The function always return successfully.
**/
EFI_STATUS
EFIAPI
FvbProtocolSetAttributes (
IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,
IN OUT EFI_FVB_ATTRIBUTES_2 *Attributes
)
{
EFI_STATUS Status;
EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
FvbDevice = FVB_DEVICE_FROM_THIS (This);
Status = FvbSetVolumeAttributes (FvbDevice->Instance, Attributes);
return Status;
}
/**
This function erases one or more blocks as denoted by the
variable argument list. The entire parameter list of blocks must be verified
prior to erasing any blocks. If a block is requested that does not exist
within the associated firmware volume (it has a larger index than the last
block of the firmware volume), the EraseBlock() function must return
EFI_INVALID_PARAMETER without modifying the contents of the firmware volume.
@param[in] This Calling context
@param[in] ... Starting LBA followed by Number of Lba to erase.
a -1 to terminate the list.
@retval EFI_SUCCESS The erase request was successfully completed
@retval EFI_ACCESS_DENIED The firmware volume is in the WriteDisabled state
@retval EFI_DEVICE_ERROR The block device is not functioning correctly and
could not be written. Firmware device may have been
partially erased
**/
EFI_STATUS
EFIAPI
FvbProtocolEraseBlocks (
IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,
...
)
{
EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
EFI_FW_VOL_INSTANCE *FwhInstance;
UINTN NumOfBlocks;
VA_LIST args;
EFI_LBA StartingLba;
UINTN NumOfLba;
EFI_STATUS Status;
FvbDevice = FVB_DEVICE_FROM_THIS (This);
FwhInstance = GetFvbInstance (FvbDevice->Instance);
if (FwhInstance == NULL) {
return EFI_OUT_OF_RESOURCES;
}
NumOfBlocks = FwhInstance->NumOfBlocks;
VA_START (args, This);
do {
StartingLba = VA_ARG (args, EFI_LBA);
if ( StartingLba == EFI_LBA_LIST_TERMINATOR ) {
break;
}
NumOfLba = VA_ARG (args, UINT32);
//
// Check input parameters
//
if (NumOfLba == 0) {
VA_END (args);
return EFI_INVALID_PARAMETER;
}
if ((StartingLba + NumOfLba) > NumOfBlocks ) {
return EFI_INVALID_PARAMETER;
}
} while (1);
VA_END (args);
VA_START (args, This);
do {
StartingLba = VA_ARG (args, EFI_LBA);
if (StartingLba == EFI_LBA_LIST_TERMINATOR) {
break;
}
NumOfLba = VA_ARG (args, UINT32);
while ( NumOfLba > 0 ) {
Status = FvbEraseBlock (FvbDevice->Instance, StartingLba);
if ( EFI_ERROR (Status)) {
VA_END (args);
return Status;
}
StartingLba++;
NumOfLba--;
}
} while (1);
VA_END (args);
return EFI_SUCCESS;
}
/**
Writes data beginning at Lba:Offset from FV. The write terminates either
when *NumBytes of data have been written, or when a block boundary is
reached. *NumBytes is updated to reflect the actual number of bytes
written. The write opertion does not include erase. This routine will
attempt to write only the specified bytes. If the writes do not stick,
it will return an error.
@param[in] This Calling context
@param[in] Lba Block in which to begin write
@param[in] Offset Offset in the block at which to begin write
@param[in,out] NumBytes On input, indicates the requested write size. On
output, indicates the actual number of bytes written
@param[in] Buffer Buffer containing source data for the write.
@retval EFI_SUCCESS The firmware volume was written successfully
@retval EFI_BAD_BUFFER_SIZE Write attempted across a LBA boundary. On output,
NumBytes contains the total number of bytes
actually written
@retval EFI_ACCESS_DENIED The firmware volume is in the WriteDisabled state
@retval EFI_DEVICE_ERROR The block device is not functioning correctly and
could not be written
@retval EFI_INVALID_PARAMETER NumBytes or Buffer are NULL
**/
EFI_STATUS
EFIAPI
FvbProtocolWrite (
IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,
IN EFI_LBA Lba,
IN UINTN Offset,
IN OUT UINTN *NumBytes,
IN UINT8 *Buffer
)
{
EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
EFI_STATUS Status;
FvbDevice = FVB_DEVICE_FROM_THIS (This);
Status = FvbWriteBlock (FvbDevice->Instance, Lba, Offset, NumBytes, Buffer);
DEBUG ((
DEBUG_VERBOSE,
"FvbWrite: Lba: 0x%lx Offset: 0x%x NumBytes: 0x%x, Buffer: 0x%x Status:%r\n",
Lba,
Offset,
*NumBytes,
Buffer,
Status
));
return Status;
}
/**
Reads data beginning at Lba:Offset from FV. The Read terminates either
when *NumBytes of data have been read, or when a block boundary is
reached. *NumBytes is updated to reflect the actual number of bytes
written. The write opertion does not include erase. This routine will
attempt to write only the specified bytes. If the writes do not stick,
it will return an error.
@param[in] This Calling context
@param[in] Lba Block in which to begin write
@param[in] Offset Offset in the block at which to begin write
@param[in,out] NumBytes On input, indicates the requested write size. On
output, indicates the actual number of bytes written
@param[out] Buffer Buffer containing source data for the write.
Returns:
@retval EFI_SUCCESS The firmware volume was read successfully and
contents are in Buffer
@retval EFI_BAD_BUFFER_SIZE Read attempted across a LBA boundary. On output,
NumBytes contains the total number of bytes returned
in Buffer
@retval EFI_ACCESS_DENIED The firmware volume is in the ReadDisabled state
@retval EFI_DEVICE_ERROR The block device is not functioning correctly and
could not be read
@retval EFI_INVALID_PARAMETER NumBytes or Buffer are NULL
**/
EFI_STATUS
EFIAPI
FvbProtocolRead (
IN CONST EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,
IN EFI_LBA Lba,
IN UINTN Offset,
IN OUT UINTN *NumBytes,
OUT UINT8 *Buffer
)
{
EFI_FW_VOL_BLOCK_DEVICE *FvbDevice;
EFI_STATUS Status;
FvbDevice = FVB_DEVICE_FROM_THIS (This);
Status = FvbReadBlock (FvbDevice->Instance, Lba, Offset, NumBytes, Buffer);
DEBUG ((
DEBUG_VERBOSE,
"FvbRead: Lba: 0x%lx Offset: 0x%x NumBytes: 0x%x, Buffer: 0x%x, Status:%r\n",
Lba,
Offset,
*NumBytes,
Buffer,
Status
));
return Status;
}
/**
Check the integrity of firmware volume header in FvBase
@param[in] FvBase A pointer to firmware volume base address.
@retval TRUE The firmware volume is consistent
@retval FALSE The firmware volume has corrupted.
**/
BOOLEAN
IsFvHeaderValid (
IN EFI_PHYSICAL_ADDRESS FvBase
)
{
UINT16 Sum;
EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)FvBase;
if (FvBase == PcdGet32 (PcdFlashNvStorageVariableBase)) {
if (CompareMem (&FwVolHeader->FileSystemGuid, &gEfiSystemNvDataFvGuid, sizeof (EFI_GUID)) != 0 ) {
DEBUG ((DEBUG_INFO, " --FileSystemGuid not match: %g\n", &FwVolHeader->FileSystemGuid));
return FALSE;
}
} else {
if (CompareMem (&FwVolHeader->FileSystemGuid, &gEfiFirmwareFileSystem2Guid, sizeof (EFI_GUID)) != 0 ) {
DEBUG ((DEBUG_INFO, " --not expected guid.\n"));
return FALSE;
}
}
if ((FwVolHeader->Revision != EFI_FVH_REVISION) ||
(FwVolHeader->Signature != EFI_FVH_SIGNATURE) ||
(FwVolHeader->FvLength == ((UINTN)-1)) ||
((FwVolHeader->HeaderLength & 0x01) != 0))
{
DEBUG ((DEBUG_INFO, " -- >Revision = 0x%x, Signature = 0x%x\n", FwVolHeader->Revision, FwVolHeader->Signature));
DEBUG ((DEBUG_INFO, " -- >FvLength = 0x%lx, HeaderLength = 0x%x\n", FwVolHeader->FvLength, FwVolHeader->HeaderLength));
return FALSE;
}
Sum = CalculateSum16 ((UINT16 *)FwVolHeader, FwVolHeader->HeaderLength);
if (Sum != 0) {
DEBUG ((DEBUG_INFO, "error: checksum: 0x%04X (expect 0x0)\n", Sum));
return FALSE;
}
return TRUE;
}
/**
Get intial variable data.
@param[out] VarData Valid variable data.
@param[out] VarSize Valid variable size.
@retval RETURN_SUCCESS Successfully found initial variable data.
@retval RETURN_NOT_FOUND Failed to find the variable data file from FV.
@retval EFI_INVALID_PARAMETER VarData or VarSize is null.
**/
EFI_STATUS
GetInitialVariableData (
OUT VOID **VarData,
OUT UINTN *VarSize
)
{
EFI_STATUS Status;
VOID *ImageData;
UINTN ImageSize;
EFI_FIRMWARE_VOLUME_HEADER *FvHeader;
VARIABLE_STORE_HEADER *VariableStore;
AUTHENTICATED_VARIABLE_HEADER *Variable;
UINTN VariableSize;
UINTN VarEndAddr;
if ((VarData == NULL) || (VarSize == NULL)) {
return EFI_INVALID_PARAMETER;
}
Status = GetSectionFromAnyFv (PcdGetPtr (PcdNvsDataFile), EFI_SECTION_RAW, 0, &ImageData, &ImageSize);
if (EFI_ERROR (Status)) {
return Status;
}
FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *)ImageData;
VariableStore = (VARIABLE_STORE_HEADER *)((UINT8 *)ImageData + FvHeader->HeaderLength);
VarEndAddr = (UINTN)VariableStore + VariableStore->Size;
Variable = (AUTHENTICATED_VARIABLE_HEADER *)HEADER_ALIGN (VariableStore + 1);
*VarData = (VOID *)Variable;
while (((UINTN)Variable < VarEndAddr)) {
if (Variable->StartId != VARIABLE_DATA) {
break;
}
VariableSize = sizeof (AUTHENTICATED_VARIABLE_HEADER) + Variable->DataSize + Variable->NameSize;
Variable = (AUTHENTICATED_VARIABLE_HEADER *)HEADER_ALIGN ((UINTN)Variable + VariableSize);
}
*VarSize = (UINTN)Variable - HEADER_ALIGN (VariableStore + 1);
return EFI_SUCCESS;
}
/**
The function does the necessary initialization work for
Firmware Volume Block Driver.
@retval EFI_SUCCESS This funtion always return EFI_SUCCESS.
It will ASSERT on errors.
**/
EFI_STATUS
FvbInitialize (
VOID
)
{
EFI_FW_VOL_INSTANCE *FwVolInstance;
EFI_FIRMWARE_VOLUME_HEADER *FvHeader;
EFI_FV_BLOCK_MAP_ENTRY *BlockMap;
EFI_PHYSICAL_ADDRESS BaseAddress;
UINTN WriteAddr;
EFI_STATUS Status;
UINTN BufferSize;
UINTN Length;
VARIABLE_STORE_HEADER VariableStore;
VOID *VarData;
InitVariableStore ();
BaseAddress = PcdGet32 (PcdFlashNvStorageVariableBase);
FvHeader = (EFI_FIRMWARE_VOLUME_HEADER *)(UINTN)BaseAddress;
//
// Check FV header and variable store header
//
if (!IsFvHeaderValid (BaseAddress)) {
//
// Write back a healthy FV header
//
DEBUG ((DEBUG_ERROR, "Fvb: Writing back a healthy FV header: 0x%lx\n", BaseAddress));
FvHeader = GetFvHeaderTemplate ();
LibFvbFlashDeviceBlockLock ((UINTN)BaseAddress, FvHeader->BlockMap->Length, FALSE);
Status = LibFvbFlashDeviceBlockErase ((UINTN)BaseAddress, FvHeader->BlockMap->Length);
ASSERT_EFI_ERROR (Status);
Length = FvHeader->HeaderLength;
WriteAddr = (UINTN)BaseAddress;
Status = LibFvbFlashDeviceWrite (WriteAddr, &Length, (UINT8 *)FvHeader);
WriteAddr += Length;
ASSERT_EFI_ERROR (Status);
//
// Write back variable store header
//
VariableStore.Size = PcdGet32 (PcdFlashNvStorageVariableSize) - FvHeader->HeaderLength;
VariableStore.Format = VARIABLE_STORE_FORMATTED;
VariableStore.State = VARIABLE_STORE_HEALTHY;
CopyGuid (&VariableStore.Signature, &gEfiAuthenticatedVariableGuid);
BufferSize = sizeof (VARIABLE_STORE_HEADER);
Status = LibFvbFlashDeviceWrite (WriteAddr, &BufferSize, (UINT8 *)&VariableStore);
WriteAddr += BufferSize;
ASSERT_EFI_ERROR (Status);
//
// Write initial variable data if found
//
Status = GetInitialVariableData (&VarData, &Length);
if (!EFI_ERROR (Status)) {
Status = LibFvbFlashDeviceWrite (WriteAddr, &Length, (UINT8 *)VarData);
ASSERT_EFI_ERROR (Status);
}
LibFvbFlashDeviceBlockLock ((UINTN)BaseAddress, FvHeader->BlockMap->Length, TRUE);
WriteBackInvalidateDataCacheRange ((VOID *)(UINTN)BaseAddress, FvHeader->BlockMap->Length);
}
//
// Create a new FW volume instance for NVS variable
//
BufferSize = FvHeader->HeaderLength + sizeof (EFI_FW_VOL_INSTANCE) - sizeof (EFI_FIRMWARE_VOLUME_HEADER);
FwVolInstance = (EFI_FW_VOL_INSTANCE *)AllocateRuntimeZeroPool (BufferSize);
if (FwVolInstance == NULL) {
return EFI_OUT_OF_RESOURCES;
}
FwVolInstance->FvBase = (UINTN)BaseAddress;
CopyMem (&FwVolInstance->VolumeHeader, FvHeader, FvHeader->HeaderLength);
//
// Process the block map for each FV. Assume it has same block size.
//
FwVolInstance->NumOfBlocks = 0;
FvHeader = &FwVolInstance->VolumeHeader;
for (BlockMap = FvHeader->BlockMap; BlockMap->NumBlocks != 0; BlockMap++) {
FwVolInstance->NumOfBlocks += BlockMap->NumBlocks;
}
//
// Add a FVB Protocol Instance
//
Status = InstallFvbProtocol (FwVolInstance, mFvbModuleGlobal.NumFv);
mFvbModuleGlobal.NumFv++;
mFvbModuleGlobal.FvInstance = FwVolInstance;
return Status;
}
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