diff options
Diffstat (limited to 'ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvb.c')
| -rw-r--r-- | ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvb.c | 697 |
1 files changed, 697 insertions, 0 deletions
diff --git a/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvb.c b/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvb.c new file mode 100644 index 0000000000..a332b5e98b --- /dev/null +++ b/ArmPlatformPkg/Drivers/NorFlashDxe/NorFlashFvb.c @@ -0,0 +1,697 @@ +/*++ @file NorFlashFvbDxe.c
+
+ Copyright (c) 2011 - 2020, ARM Ltd. All rights reserved.<BR>
+
+ SPDX-License-Identifier: BSD-2-Clause-Patent
+
+ --*/
+
+#include <PiDxe.h>
+
+#include <Library/PcdLib.h>
+#include <Library/BaseLib.h>
+#include <Library/UefiLib.h>
+#include <Library/BaseMemoryLib.h>
+#include <Library/MemoryAllocationLib.h>
+
+#include <Guid/VariableFormat.h>
+#include <Guid/SystemNvDataGuid.h>
+#include <Guid/NvVarStoreFormatted.h>
+
+#include "NorFlash.h"
+
+extern UINTN mFlashNvStorageVariableBase;
+///
+/// The Firmware Volume Block Protocol is the low-level interface
+/// to a firmware volume. File-level access to a firmware volume
+/// should not be done using the Firmware Volume Block Protocol.
+/// Normal access to a firmware volume must use the Firmware
+/// Volume Protocol. Typically, only the file system driver that
+/// produces the Firmware Volume Protocol will bind to the
+/// Firmware Volume Block Protocol.
+///
+
+/**
+ Initialises the FV Header and Variable Store Header
+ to support variable operations.
+
+ @param[in] Ptr - Location to initialise the headers
+
+**/
+EFI_STATUS
+InitializeFvAndVariableStoreHeaders (
+ IN NOR_FLASH_INSTANCE *Instance
+ )
+{
+ EFI_STATUS Status;
+ VOID* Headers;
+ UINTN HeadersLength;
+ EFI_FIRMWARE_VOLUME_HEADER *FirmwareVolumeHeader;
+ VARIABLE_STORE_HEADER *VariableStoreHeader;
+
+ HeadersLength = sizeof(EFI_FIRMWARE_VOLUME_HEADER) + sizeof(EFI_FV_BLOCK_MAP_ENTRY) + sizeof(VARIABLE_STORE_HEADER);
+ Headers = AllocateZeroPool(HeadersLength);
+
+ // FirmwareVolumeHeader->FvLength is declared to have the Variable area AND the FTW working area AND the FTW Spare contiguous.
+ ASSERT(PcdGet32(PcdFlashNvStorageVariableBase) + PcdGet32(PcdFlashNvStorageVariableSize) == PcdGet32(PcdFlashNvStorageFtwWorkingBase));
+ ASSERT(PcdGet32(PcdFlashNvStorageFtwWorkingBase) + PcdGet32(PcdFlashNvStorageFtwWorkingSize) == PcdGet32(PcdFlashNvStorageFtwSpareBase));
+
+ // Check if the size of the area is at least one block size
+ ASSERT((PcdGet32(PcdFlashNvStorageVariableSize) > 0) && (PcdGet32(PcdFlashNvStorageVariableSize) / Instance->Media.BlockSize > 0));
+ ASSERT((PcdGet32(PcdFlashNvStorageFtwWorkingSize) > 0) && (PcdGet32(PcdFlashNvStorageFtwWorkingSize) / Instance->Media.BlockSize > 0));
+ ASSERT((PcdGet32(PcdFlashNvStorageFtwSpareSize) > 0) && (PcdGet32(PcdFlashNvStorageFtwSpareSize) / Instance->Media.BlockSize > 0));
+
+ // Ensure the Variable area Base Addresses are aligned on a block size boundaries
+ ASSERT(PcdGet32(PcdFlashNvStorageVariableBase) % Instance->Media.BlockSize == 0);
+ ASSERT(PcdGet32(PcdFlashNvStorageFtwWorkingBase) % Instance->Media.BlockSize == 0);
+ ASSERT(PcdGet32(PcdFlashNvStorageFtwSpareBase) % Instance->Media.BlockSize == 0);
+
+ //
+ // EFI_FIRMWARE_VOLUME_HEADER
+ //
+ FirmwareVolumeHeader = (EFI_FIRMWARE_VOLUME_HEADER*)Headers;
+ CopyGuid (&FirmwareVolumeHeader->FileSystemGuid, &gEfiSystemNvDataFvGuid);
+ FirmwareVolumeHeader->FvLength =
+ PcdGet32(PcdFlashNvStorageVariableSize) +
+ PcdGet32(PcdFlashNvStorageFtwWorkingSize) +
+ PcdGet32(PcdFlashNvStorageFtwSpareSize);
+ FirmwareVolumeHeader->Signature = EFI_FVH_SIGNATURE;
+ FirmwareVolumeHeader->Attributes = (EFI_FVB_ATTRIBUTES_2) (
+ EFI_FVB2_READ_ENABLED_CAP | // Reads may be enabled
+ EFI_FVB2_READ_STATUS | // Reads are currently enabled
+ EFI_FVB2_STICKY_WRITE | // A block erase is required to flip bits into EFI_FVB2_ERASE_POLARITY
+ EFI_FVB2_MEMORY_MAPPED | // It is memory mapped
+ EFI_FVB2_ERASE_POLARITY | // After erasure all bits take this value (i.e. '1')
+ EFI_FVB2_WRITE_STATUS | // Writes are currently enabled
+ EFI_FVB2_WRITE_ENABLED_CAP // Writes may be enabled
+ );
+ FirmwareVolumeHeader->HeaderLength = sizeof(EFI_FIRMWARE_VOLUME_HEADER) + sizeof(EFI_FV_BLOCK_MAP_ENTRY);
+ FirmwareVolumeHeader->Revision = EFI_FVH_REVISION;
+ FirmwareVolumeHeader->BlockMap[0].NumBlocks = Instance->Media.LastBlock + 1;
+ FirmwareVolumeHeader->BlockMap[0].Length = Instance->Media.BlockSize;
+ FirmwareVolumeHeader->BlockMap[1].NumBlocks = 0;
+ FirmwareVolumeHeader->BlockMap[1].Length = 0;
+ FirmwareVolumeHeader->Checksum = CalculateCheckSum16 ((UINT16*)FirmwareVolumeHeader,FirmwareVolumeHeader->HeaderLength);
+
+ //
+ // VARIABLE_STORE_HEADER
+ //
+ VariableStoreHeader = (VARIABLE_STORE_HEADER*)((UINTN)Headers + FirmwareVolumeHeader->HeaderLength);
+ CopyGuid (&VariableStoreHeader->Signature, &gEfiAuthenticatedVariableGuid);
+ VariableStoreHeader->Size = PcdGet32(PcdFlashNvStorageVariableSize) - FirmwareVolumeHeader->HeaderLength;
+ VariableStoreHeader->Format = VARIABLE_STORE_FORMATTED;
+ VariableStoreHeader->State = VARIABLE_STORE_HEALTHY;
+
+ // Install the combined super-header in the NorFlash
+ Status = FvbWrite (&Instance->FvbProtocol, 0, 0, &HeadersLength, Headers);
+
+ FreePool (Headers);
+ return Status;
+}
+
+/**
+ Check the integrity of firmware volume header.
+
+ @param[in] FwVolHeader - A pointer to a firmware volume header
+
+ @retval EFI_SUCCESS - The firmware volume is consistent
+ @retval EFI_NOT_FOUND - The firmware volume has been corrupted.
+
+**/
+EFI_STATUS
+ValidateFvHeader (
+ IN NOR_FLASH_INSTANCE *Instance
+ )
+{
+ UINT16 Checksum;
+ EFI_FIRMWARE_VOLUME_HEADER *FwVolHeader;
+ VARIABLE_STORE_HEADER *VariableStoreHeader;
+ UINTN VariableStoreLength;
+ UINTN FvLength;
+
+ FwVolHeader = (EFI_FIRMWARE_VOLUME_HEADER*)Instance->RegionBaseAddress;
+
+ FvLength = PcdGet32(PcdFlashNvStorageVariableSize) + PcdGet32(PcdFlashNvStorageFtwWorkingSize) +
+ PcdGet32(PcdFlashNvStorageFtwSpareSize);
+
+ //
+ // Verify the header revision, header signature, length
+ // Length of FvBlock cannot be 2**64-1
+ // HeaderLength cannot be an odd number
+ //
+ if ( (FwVolHeader->Revision != EFI_FVH_REVISION)
+ || (FwVolHeader->Signature != EFI_FVH_SIGNATURE)
+ || (FwVolHeader->FvLength != FvLength)
+ )
+ {
+ DEBUG ((EFI_D_INFO, "%a: No Firmware Volume header present\n",
+ __FUNCTION__));
+ return EFI_NOT_FOUND;
+ }
+
+ // Check the Firmware Volume Guid
+ if( CompareGuid (&FwVolHeader->FileSystemGuid, &gEfiSystemNvDataFvGuid) == FALSE ) {
+ DEBUG ((EFI_D_INFO, "%a: Firmware Volume Guid non-compatible\n",
+ __FUNCTION__));
+ return EFI_NOT_FOUND;
+ }
+
+ // Verify the header checksum
+ Checksum = CalculateSum16((UINT16*)FwVolHeader, FwVolHeader->HeaderLength);
+ if (Checksum != 0) {
+ DEBUG ((EFI_D_INFO, "%a: FV checksum is invalid (Checksum:0x%X)\n",
+ __FUNCTION__, Checksum));
+ return EFI_NOT_FOUND;
+ }
+
+ VariableStoreHeader = (VARIABLE_STORE_HEADER*)((UINTN)FwVolHeader + FwVolHeader->HeaderLength);
+
+ // Check the Variable Store Guid
+ if (!CompareGuid (&VariableStoreHeader->Signature, &gEfiVariableGuid) &&
+ !CompareGuid (&VariableStoreHeader->Signature, &gEfiAuthenticatedVariableGuid)) {
+ DEBUG ((EFI_D_INFO, "%a: Variable Store Guid non-compatible\n",
+ __FUNCTION__));
+ return EFI_NOT_FOUND;
+ }
+
+ VariableStoreLength = PcdGet32 (PcdFlashNvStorageVariableSize) - FwVolHeader->HeaderLength;
+ if (VariableStoreHeader->Size != VariableStoreLength) {
+ DEBUG ((EFI_D_INFO, "%a: Variable Store Length does not match\n",
+ __FUNCTION__));
+ return EFI_NOT_FOUND;
+ }
+
+ return EFI_SUCCESS;
+}
+
+/**
+ The GetAttributes() function retrieves the attributes and
+ current settings of the block.
+
+ @param This Indicates the EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL instance.
+
+ @param Attributes Pointer to EFI_FVB_ATTRIBUTES_2 in which the attributes and
+ current settings are returned.
+ Type EFI_FVB_ATTRIBUTES_2 is defined in EFI_FIRMWARE_VOLUME_HEADER.
+
+ @retval EFI_SUCCESS The firmware volume attributes were returned.
+
+ **/
+EFI_STATUS
+EFIAPI
+FvbGetAttributes(
+ IN CONST EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL *This,
+ OUT EFI_FVB_ATTRIBUTES_2 *Attributes
+ )
+{
+ EFI_FVB_ATTRIBUTES_2 FlashFvbAttributes;
+ NOR_FLASH_INSTANCE *Instance;
+
+ Instance = INSTANCE_FROM_FVB_THIS(This);
+
+ FlashFvbAttributes = (EFI_FVB_ATTRIBUTES_2) (
+
+ EFI_FVB2_READ_ENABLED_CAP | // Reads may be enabled
+ EFI_FVB2_READ_STATUS | // Reads are currently enabled
+ EFI_FVB2_STICKY_WRITE | // A block erase is required to flip bits into EFI_FVB2_ERASE_POLARITY
+ EFI_FVB2_MEMORY_MAPPED | // It is memory mapped
+ EFI_FVB2_ERASE_POLARITY // After erasure all bits take this value (i.e. '1')
+
+ );
+
+ // Check if it is write protected
+ if (Instance->Media.ReadOnly != TRUE) {
+
+ FlashFvbAttributes = FlashFvbAttributes |
+ EFI_FVB2_WRITE_STATUS | // Writes are currently enabled
+ EFI_FVB2_WRITE_ENABLED_CAP; // Writes may be enabled
+ }
+
+ *Attributes = FlashFvbAttributes;
+
+ DEBUG ((DEBUG_BLKIO, "FvbGetAttributes(0x%X)\n", *Attributes));
+
+ return EFI_SUCCESS;
+}
+
+/**
+ The SetAttributes() function sets configurable firmware volume attributes
+ and returns the new settings of the firmware volume.
+
+
+ @param This Indicates the EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL instance.
+
+ @param Attributes On input, Attributes is a pointer to EFI_FVB_ATTRIBUTES_2
+ that contains the desired firmware volume settings.
+ On successful return, it contains the new settings of
+ the firmware volume.
+ Type EFI_FVB_ATTRIBUTES_2 is defined in EFI_FIRMWARE_VOLUME_HEADER.
+
+ @retval EFI_SUCCESS The firmware volume attributes were returned.
+
+ @retval EFI_INVALID_PARAMETER The attributes requested are in conflict with the capabilities
+ as declared in the firmware volume header.
+
+ **/
+EFI_STATUS
+EFIAPI
+FvbSetAttributes(
+ IN CONST EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL *This,
+ IN OUT EFI_FVB_ATTRIBUTES_2 *Attributes
+ )
+{
+ DEBUG ((DEBUG_BLKIO, "FvbSetAttributes(0x%X) is not supported\n",*Attributes));
+ return EFI_UNSUPPORTED;
+}
+
+/**
+ The GetPhysicalAddress() function retrieves the base address of
+ a memory-mapped firmware volume. This function should be called
+ only for memory-mapped firmware volumes.
+
+ @param This Indicates the EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL instance.
+
+ @param Address Pointer to a caller-allocated
+ EFI_PHYSICAL_ADDRESS that, on successful
+ return from GetPhysicalAddress(), contains the
+ base address of the firmware volume.
+
+ @retval EFI_SUCCESS The firmware volume base address was returned.
+
+ @retval EFI_NOT_SUPPORTED The firmware volume is not memory mapped.
+
+ **/
+EFI_STATUS
+EFIAPI
+FvbGetPhysicalAddress (
+ IN CONST EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL *This,
+ OUT EFI_PHYSICAL_ADDRESS *Address
+ )
+{
+ NOR_FLASH_INSTANCE *Instance;
+
+ Instance = INSTANCE_FROM_FVB_THIS(This);
+
+ DEBUG ((DEBUG_BLKIO, "FvbGetPhysicalAddress(BaseAddress=0x%08x)\n", Instance->RegionBaseAddress));
+
+ ASSERT(Address != NULL);
+
+ *Address = mFlashNvStorageVariableBase;
+ return EFI_SUCCESS;
+}
+
+/**
+ The GetBlockSize() function retrieves the size of the requested
+ block. It also returns the number of additional blocks with
+ the identical size. The GetBlockSize() function is used to
+ retrieve the block map (see EFI_FIRMWARE_VOLUME_HEADER).
+
+
+ @param This Indicates the EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL instance.
+
+ @param Lba Indicates the block for which to return the size.
+
+ @param BlockSize Pointer to a caller-allocated UINTN in which
+ the size of the block is returned.
+
+ @param NumberOfBlocks 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 firmware volume base address was returned.
+
+ @retval EFI_INVALID_PARAMETER The requested LBA is out of range.
+
+ **/
+EFI_STATUS
+EFIAPI
+FvbGetBlockSize (
+ IN CONST EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL *This,
+ IN EFI_LBA Lba,
+ OUT UINTN *BlockSize,
+ OUT UINTN *NumberOfBlocks
+ )
+{
+ EFI_STATUS Status;
+ NOR_FLASH_INSTANCE *Instance;
+
+ Instance = INSTANCE_FROM_FVB_THIS(This);
+
+ DEBUG ((DEBUG_BLKIO, "FvbGetBlockSize(Lba=%ld, BlockSize=0x%x, LastBlock=%ld)\n", Lba, Instance->Media.BlockSize, Instance->Media.LastBlock));
+
+ if (Lba > Instance->Media.LastBlock) {
+ DEBUG ((EFI_D_ERROR, "FvbGetBlockSize: ERROR - Parameter LBA %ld is beyond the last Lba (%ld).\n", Lba, Instance->Media.LastBlock));
+ Status = EFI_INVALID_PARAMETER;
+ } else {
+ // This is easy because in this platform each NorFlash device has equal sized blocks.
+ *BlockSize = (UINTN) Instance->Media.BlockSize;
+ *NumberOfBlocks = (UINTN) (Instance->Media.LastBlock - Lba + 1);
+
+ DEBUG ((DEBUG_BLKIO, "FvbGetBlockSize: *BlockSize=0x%x, *NumberOfBlocks=0x%x.\n", *BlockSize, *NumberOfBlocks));
+
+ Status = EFI_SUCCESS;
+ }
+
+ return Status;
+}
+
+/**
+ Reads the specified number of bytes into a buffer from the specified block.
+
+ The Read() function reads the requested number of bytes from the
+ requested block and stores them in the provided buffer.
+ Implementations should be mindful that the firmware volume
+ might be in the ReadDisabled state. If it is in this state,
+ the Read() function must return the status code
+ EFI_ACCESS_DENIED without modifying the contents of the
+ buffer. The Read() function must also prevent spanning block
+ boundaries. If a read is requested that would span a block
+ boundary, the read must read up to the boundary but not
+ beyond. The output parameter NumBytes must be set to correctly
+ indicate the number of bytes actually read. The caller must be
+ aware that a read may be partially completed.
+
+ @param This Indicates the EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL instance.
+
+ @param Lba The starting logical block index from which to read.
+
+ @param Offset Offset into the block at which to begin reading.
+
+ @param NumBytes Pointer to a UINTN.
+ At entry, *NumBytes contains the total size of the buffer.
+ At exit, *NumBytes contains the total number of bytes read.
+
+ @param Buffer Pointer to a caller-allocated buffer that will be used
+ to hold the data that is read.
+
+ @retval EFI_SUCCESS The firmware volume was read successfully, and contents are
+ in Buffer.
+
+ @retval EFI_BAD_BUFFER_SIZE Read attempted across an 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.
+
+ **/
+EFI_STATUS
+EFIAPI
+FvbRead (
+ IN CONST EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL *This,
+ IN EFI_LBA Lba,
+ IN UINTN Offset,
+ IN OUT UINTN *NumBytes,
+ IN OUT UINT8 *Buffer
+ )
+{
+ EFI_STATUS TempStatus;
+ UINTN BlockSize;
+ NOR_FLASH_INSTANCE *Instance;
+
+ Instance = INSTANCE_FROM_FVB_THIS(This);
+
+ DEBUG ((DEBUG_BLKIO, "FvbRead(Parameters: Lba=%ld, Offset=0x%x, *NumBytes=0x%x, Buffer @ 0x%08x)\n", Instance->StartLba + Lba, Offset, *NumBytes, Buffer));
+
+ TempStatus = EFI_SUCCESS;
+
+ // Cache the block size to avoid de-referencing pointers all the time
+ BlockSize = Instance->Media.BlockSize;
+
+ DEBUG ((DEBUG_BLKIO, "FvbRead: Check if (Offset=0x%x + NumBytes=0x%x) <= BlockSize=0x%x\n", Offset, *NumBytes, BlockSize ));
+
+ // The read must not span block boundaries.
+ // We need to check each variable individually because adding two large values together overflows.
+ if ((Offset >= BlockSize) ||
+ (*NumBytes > BlockSize) ||
+ ((Offset + *NumBytes) > BlockSize)) {
+ DEBUG ((EFI_D_ERROR, "FvbRead: ERROR - EFI_BAD_BUFFER_SIZE: (Offset=0x%x + NumBytes=0x%x) > BlockSize=0x%x\n", Offset, *NumBytes, BlockSize ));
+ return EFI_BAD_BUFFER_SIZE;
+ }
+
+ // We must have some bytes to read
+ if (*NumBytes == 0) {
+ return EFI_BAD_BUFFER_SIZE;
+ }
+
+ // Decide if we are doing full block reads or not.
+ if (*NumBytes % BlockSize != 0) {
+ TempStatus = NorFlashRead (Instance, Instance->StartLba + Lba, Offset, *NumBytes, Buffer);
+ if (EFI_ERROR (TempStatus)) {
+ return EFI_DEVICE_ERROR;
+ }
+ } else {
+ // Read NOR Flash data into shadow buffer
+ TempStatus = NorFlashReadBlocks (Instance, Instance->StartLba + Lba, BlockSize, Buffer);
+ if (EFI_ERROR (TempStatus)) {
+ // Return one of the pre-approved error statuses
+ return EFI_DEVICE_ERROR;
+ }
+ }
+ return EFI_SUCCESS;
+}
+
+/**
+ Writes the specified number of bytes from the input buffer to the block.
+
+ The Write() function writes the specified number of bytes from
+ the provided buffer to the specified block and offset. If the
+ firmware volume is sticky write, the caller must ensure that
+ all the bits of the specified range to write are in the
+ EFI_FVB_ERASE_POLARITY state before calling the Write()
+ function, or else the result will be unpredictable. This
+ unpredictability arises because, for a sticky-write firmware
+ volume, a write may negate a bit in the EFI_FVB_ERASE_POLARITY
+ state but cannot flip it back again. Before calling the
+ Write() function, it is recommended for the caller to first call
+ the EraseBlocks() function to erase the specified block to
+ write. A block erase cycle will transition bits from the
+ (NOT)EFI_FVB_ERASE_POLARITY state back to the
+ EFI_FVB_ERASE_POLARITY state. Implementations should be
+ mindful that the firmware volume might be in the WriteDisabled
+ state. If it is in this state, the Write() function must
+ return the status code EFI_ACCESS_DENIED without modifying the
+ contents of the firmware volume. The Write() function must
+ also prevent spanning block boundaries. If a write is
+ requested that spans a block boundary, the write must store up
+ to the boundary but not beyond. The output parameter NumBytes
+ must be set to correctly indicate the number of bytes actually
+ written. The caller must be aware that a write may be
+ partially completed. All writes, partial or otherwise, must be
+ fully flushed to the hardware before the Write() service
+ returns.
+
+ @param This Indicates the EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL instance.
+
+ @param Lba The starting logical block index to write to.
+
+ @param Offset Offset into the block at which to begin writing.
+
+ @param NumBytes The pointer to a UINTN.
+ At entry, *NumBytes contains the total size of the buffer.
+ At exit, *NumBytes contains the total number of bytes actually written.
+
+ @param Buffer The 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 The write was attempted across an 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 malfunctioning and could not be written.
+
+
+ **/
+EFI_STATUS
+EFIAPI
+FvbWrite (
+ IN CONST EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL *This,
+ IN EFI_LBA Lba,
+ IN UINTN Offset,
+ IN OUT UINTN *NumBytes,
+ IN UINT8 *Buffer
+ )
+{
+ NOR_FLASH_INSTANCE *Instance;
+
+ Instance = INSTANCE_FROM_FVB_THIS (This);
+
+ return NorFlashWriteSingleBlock (Instance, Instance->StartLba + Lba, Offset, NumBytes, Buffer);
+}
+
+/**
+ Erases and initialises a firmware volume block.
+
+ The EraseBlocks() function erases one or more blocks as denoted
+ by the variable argument list. The entire parameter list of
+ blocks must be verified before 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 EraseBlocks() function must return the
+ status code EFI_INVALID_PARAMETER without modifying the contents
+ of the firmware volume. Implementations should be mindful that
+ the firmware volume might be in the WriteDisabled state. If it
+ is in this state, the EraseBlocks() function must return the
+ status code EFI_ACCESS_DENIED without modifying the contents of
+ the firmware volume. All calls to EraseBlocks() must be fully
+ flushed to the hardware before the EraseBlocks() service
+ returns.
+
+ @param This Indicates the EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL
+ instance.
+
+ @param ... The variable argument list is a list of tuples.
+ Each tuple describes a range of LBAs to erase
+ and consists of the following:
+ - An EFI_LBA that indicates the starting LBA
+ - A UINTN that indicates the number of blocks to erase.
+
+ The list is terminated with an EFI_LBA_LIST_TERMINATOR.
+ For example, the following indicates that two ranges of blocks
+ (5-7 and 10-11) are to be erased:
+ EraseBlocks (This, 5, 3, 10, 2, EFI_LBA_LIST_TERMINATOR);
+
+ @retval EFI_SUCCESS The erase request 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.
+ The firmware device may have been partially erased.
+
+ @retval EFI_INVALID_PARAMETER One or more of the LBAs listed in the variable argument list do
+ not exist in the firmware volume.
+
+ **/
+EFI_STATUS
+EFIAPI
+FvbEraseBlocks (
+ IN CONST EFI_FIRMWARE_VOLUME_BLOCK2_PROTOCOL *This,
+ ...
+ )
+{
+ EFI_STATUS Status;
+ VA_LIST Args;
+ UINTN BlockAddress; // Physical address of Lba to erase
+ EFI_LBA StartingLba; // Lba from which we start erasing
+ UINTN NumOfLba; // Number of Lba blocks to erase
+ NOR_FLASH_INSTANCE *Instance;
+
+ Instance = INSTANCE_FROM_FVB_THIS(This);
+
+ DEBUG ((DEBUG_BLKIO, "FvbEraseBlocks()\n"));
+
+ Status = EFI_SUCCESS;
+
+ // Detect WriteDisabled state
+ if (Instance->Media.ReadOnly == TRUE) {
+ // Firmware volume is in WriteDisabled state
+ DEBUG ((EFI_D_ERROR, "FvbEraseBlocks: ERROR - Device is in WriteDisabled state.\n"));
+ return EFI_ACCESS_DENIED;
+ }
+
+ // Before erasing, check the entire list of parameters to ensure all specified blocks are valid
+
+ VA_START (Args, This);
+ do {
+ // Get the Lba from which we start erasing
+ StartingLba = VA_ARG (Args, EFI_LBA);
+
+ // Have we reached the end of the list?
+ if (StartingLba == EFI_LBA_LIST_TERMINATOR) {
+ //Exit the while loop
+ break;
+ }
+
+ // How many Lba blocks are we requested to erase?
+ NumOfLba = VA_ARG (Args, UINTN);
+
+ // All blocks must be within range
+ DEBUG ((
+ DEBUG_BLKIO,
+ "FvbEraseBlocks: Check if: ( StartingLba=%ld + NumOfLba=%Lu - 1 ) > LastBlock=%ld.\n",
+ Instance->StartLba + StartingLba,
+ (UINT64)NumOfLba,
+ Instance->Media.LastBlock
+ ));
+ if ((NumOfLba == 0) || ((Instance->StartLba + StartingLba + NumOfLba - 1) > Instance->Media.LastBlock)) {
+ VA_END (Args);
+ DEBUG ((EFI_D_ERROR, "FvbEraseBlocks: ERROR - Lba range goes past the last Lba.\n"));
+ Status = EFI_INVALID_PARAMETER;
+ goto EXIT;
+ }
+ } while (TRUE);
+ VA_END (Args);
+
+ //
+ // To get here, all must be ok, so start erasing
+ //
+ VA_START (Args, This);
+ do {
+ // Get the Lba from which we start erasing
+ StartingLba = VA_ARG (Args, EFI_LBA);
+
+ // Have we reached the end of the list?
+ if (StartingLba == EFI_LBA_LIST_TERMINATOR) {
+ // Exit the while loop
+ break;
+ }
+
+ // How many Lba blocks are we requested to erase?
+ NumOfLba = VA_ARG (Args, UINTN);
+
+ // Go through each one and erase it
+ while (NumOfLba > 0) {
+
+ // Get the physical address of Lba to erase
+ BlockAddress = GET_NOR_BLOCK_ADDRESS (
+ Instance->RegionBaseAddress,
+ Instance->StartLba + StartingLba,
+ Instance->Media.BlockSize
+ );
+
+ // Erase it
+ DEBUG ((DEBUG_BLKIO, "FvbEraseBlocks: Erasing Lba=%ld @ 0x%08x.\n", Instance->StartLba + StartingLba, BlockAddress));
+ Status = NorFlashUnlockAndEraseSingleBlock (Instance, BlockAddress);
+ if (EFI_ERROR(Status)) {
+ VA_END (Args);
+ Status = EFI_DEVICE_ERROR;
+ goto EXIT;
+ }
+
+ // Move to the next Lba
+ StartingLba++;
+ NumOfLba--;
+ }
+ } while (TRUE);
+ VA_END (Args);
+
+EXIT:
+ return Status;
+}
+
+/**
+ Fixup internal data so that EFI can be call in virtual mode.
+ Call the passed in Child Notify event and convert any pointers in
+ lib to virtual mode.
+
+ @param[in] Event The Event that is being processed
+ @param[in] Context Event Context
+**/
+VOID
+EFIAPI
+FvbVirtualNotifyEvent (
+ IN EFI_EVENT Event,
+ IN VOID *Context
+ )
+{
+ EfiConvertPointer (0x0, (VOID**)&mFlashNvStorageVariableBase);
+ return;
+}
+
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