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Update Mass Storage bootloader for Linux compatibility, and to reduce the compiled bootloader size. Linux appears to replace files with a cluster offset on the disk rather than re-using the same disk clusters (unlike Windows) so the file offset needs to be tracked and compensated for.

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This commit is contained in:
Dean Camera 2013-03-29 10:23:09 +00:00
parent 148b434228
commit 83d5c4729e
3 changed files with 133 additions and 94 deletions
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13
Bootloaders/MassStorage/Lib/SCSI.c
View File

@ -255,10 +255,15 @@ static bool SCSI_Command_ReadWrite_10(USB_ClassInfo_MS_Device_t* const MSInterfa
}
/* Determine if the packet is a READ (10) or WRITE (10) command, call appropriate function */
if (IsDataRead == DATA_READ)
VirtualFAT_ReadBlocks(BlockAddress, TotalBlocks);
else
VirtualFAT_WriteBlocks(BlockAddress, TotalBlocks);
while (TotalBlocks--)
{
if (IsDataRead == DATA_READ)
VirtualFAT_ReadBlock(BlockAddress);
else
VirtualFAT_WriteBlock(BlockAddress);
BlockAddress++;
}
/* Update the bytes transferred counter and succeed the command */
MSInterfaceInfo->State.CommandBlock.DataTransferLength -= ((uint32_t)TotalBlocks * SECTOR_SIZE_BYTES);

185
Bootloaders/MassStorage/Lib/VirtualFAT.c
View File

@ -72,12 +72,13 @@ static const FATBootBlock_t BootBlock =
};
/** FAT 8.3 style directory entry, for the virtual FLASH contents file. */
static FATDirectoryEntry_t FirmwareFileEntries[] =
FATDirectoryEntry_t FirmwareFileEntries[] =
{
/* Root volume label entry; disk label is contained in the Filename and
* Extension fields (concatenated) with a special attribute flag - other
* fields are ignored. Should be the same as the label in the boot block.
*/
[DISK_FILE_ENTRY_VolumeID] =
{
.MSDOS_Directory =
{
@ -94,6 +95,7 @@ static FATDirectoryEntry_t FirmwareFileEntries[] =
/* VFAT Long File Name entry for the virtual firmware file; required to
* prevent corruption from systems that are unable to detect the device
* as being a legacy MSDOS style FAT12 volume. */
[DISK_FILE_ENTRY_FirmwareLFN] =
{
.VFAT_LongFileName =
{
@ -121,6 +123,7 @@ static FATDirectoryEntry_t FirmwareFileEntries[] =
},
/* MSDOS file entry for the virtual Firmware image. */
[DISK_FILE_ENTRY_FirmwareMSDOS] =
{
.MSDOS_File =
{
@ -136,6 +139,12 @@ static FATDirectoryEntry_t FirmwareFileEntries[] =
},
};
/** Starting block of the virtual firmware file image on disk. On Windows, files
* are (usually?) replaced using the original file's physical sectors. On Linux
* file replacements are performed with an offset.
*/
uint16_t FileStartBlock = DISK_BLOCK_DataStartBlock;
/** Updates a FAT12 cluster entry in the FAT file table with the specified next
* chain index. If the cluster is the last in the file chain, the magic value
@ -170,12 +179,72 @@ static void UpdateFAT12ClusterEntry(uint8_t* const FATTable,
}
}
/** Reads or writes a block of data from/to the physical device FLASH using a
* block buffer stored in RAM, if the requested block is within the virtual
* firmware file's sector ranges in the emulated FAT file system.
*
* \param[in] BlockNumber Physical disk block to read from
* \param[in,out] BlockBuffer Pointer to the start of the block buffer in RAM
* \param[in] Read If \c true, the requested block is read, if
* \c false, the requested block is written
*/
static void ReadWriteFirmwareFileBlock(const uint16_t BlockNumber,
uint8_t* BlockBuffer,
const bool Read)
{
/* Range check the write request - abort if requested block is not within the
* virtual firmware file sector range */
if (!((BlockNumber >= FileStartBlock) && (BlockNumber < (FileStartBlock + FILE_SECTORS(FIRMWARE_FILE_SIZE_BYTES)))))
return;
#if (FLASHEND > 0xFFFF)
uint32_t FlashAddress = (uint32_t)(BlockNumber - FileStartBlock) * SECTOR_SIZE_BYTES;
#else
uint16_t FlashAddress = (uint16_t)(BlockNumber - FileStartBlock) * SECTOR_SIZE_BYTES;
#endif
if (Read)
{
/* Read out the mapped block of data from the device's FLASH */
for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i++)
{
#if (FLASHEND > 0xFFFF)
BlockBuffer[i] = pgm_read_byte_far(FlashAddress++);
#else
BlockBuffer[i] = pgm_read_byte(FlashAddress++);
#endif
}
}
else
{
/* Write out the mapped block of data to the device's FLASH */
for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i += 2)
{
if ((FlashAddress % SPM_PAGESIZE) == 0)
{
/* Erase the given FLASH page, ready to be programmed */
BootloaderAPI_ErasePage(FlashAddress);
}
/* Write the next data word to the FLASH page */
BootloaderAPI_FillWord(FlashAddress, (BlockBuffer[i + 1] << 8) | BlockBuffer[i]);
FlashAddress += 2;
if ((FlashAddress % SPM_PAGESIZE) == 0)
{
/* Write the filled FLASH page to memory */
BootloaderAPI_WritePage(FlashAddress - SPM_PAGESIZE);
}
}
}
}
/** Writes a block of data to the virtual FAT filesystem, from the USB Mass
* Storage interface.
*
* \param[in] BlockNumber Index of the block to write.
*/
static void WriteVirtualBlock(const uint16_t BlockNumber)
void VirtualFAT_WriteBlock(const uint16_t BlockNumber)
{
uint8_t BlockBuffer[SECTOR_SIZE_BYTES];
@ -183,32 +252,19 @@ static void WriteVirtualBlock(const uint16_t BlockNumber)
Endpoint_Read_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
Endpoint_ClearOUT();
if ((BlockNumber >= 4) && (BlockNumber < (4 + FILE_SECTORS(FIRMWARE_FILE_SIZE_BYTES))))
if (BlockNumber == DISK_BLOCK_RootFilesBlock)
{
#if (FLASHEND > 0xFFFF)
uint32_t WriteFlashAddress = (uint32_t)(BlockNumber - 4) * SECTOR_SIZE_BYTES;
#else
uint16_t WriteFlashAddress = (uint16_t)(BlockNumber - 4) * SECTOR_SIZE_BYTES;
#endif
/* Copy over the updated directory entries */
memcpy(FirmwareFileEntries, BlockBuffer, sizeof(FirmwareFileEntries));
for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i += 2)
{
if ((WriteFlashAddress % SPM_PAGESIZE) == 0)
{
/* Erase the given FLASH page, ready to be programmed */
BootloaderAPI_ErasePage(WriteFlashAddress);
}
/* Write the next data word to the FLASH page */
BootloaderAPI_FillWord(WriteFlashAddress, (BlockBuffer[i + 1] << 8) | BlockBuffer[i]);
WriteFlashAddress += 2;
if ((WriteFlashAddress % SPM_PAGESIZE) == 0)
{
/* Write the filled FLASH page to memory */
BootloaderAPI_WritePage(WriteFlashAddress - SPM_PAGESIZE);
}
}
/* Save the new firmware file block offset so the written and read file
* contents can be correctly mapped to the device's FLASH pages */
FileStartBlock = DISK_BLOCK_DataStartBlock +
(FirmwareFileEntries[DISK_FILE_ENTRY_FirmwareMSDOS].MSDOS_File.StartingCluster - 2) * SECTOR_PER_CLUSTER;
}
else
{
ReadWriteFirmwareFileBlock(BlockNumber, BlockBuffer, false);
}
}
@ -217,23 +273,24 @@ static void WriteVirtualBlock(const uint16_t BlockNumber)
*
* \param[in] BlockNumber Index of the block to read.
*/
static void ReadVirtualBlock(const uint16_t BlockNumber)
void VirtualFAT_ReadBlock(const uint16_t BlockNumber)
{
uint8_t BlockBuffer[SECTOR_SIZE_BYTES];
memset(BlockBuffer, 0x00, sizeof(BlockBuffer));
switch (BlockNumber)
{
case 0: /* Block 0: Boot block sector */
case DISK_BLOCK_BootBlock:
memcpy(BlockBuffer, &BootBlock, sizeof(FATBootBlock_t));
/* Add the magic signature to the end of the block */
BlockBuffer[SECTOR_SIZE_BYTES - 2] = 0x55;
BlockBuffer[SECTOR_SIZE_BYTES - 1] = 0xAA;
break;
case 1: /* Block 1: First FAT12 cluster chain copy */
case 2: /* Block 2: Second FAT12 cluster chain copy */
case DISK_BLOCK_FATBlock1:
case DISK_BLOCK_FATBlock2:
/* Cluster 0: Media type/Reserved */
UpdateFAT12ClusterEntry(BlockBuffer, 0, 0xF00 | BootBlock.MediaDescriptor);
@ -241,32 +298,27 @@ static void ReadVirtualBlock(const uint16_t BlockNumber)
UpdateFAT12ClusterEntry(BlockBuffer, 1, 0xFFF);
/* Cluster 2 onwards: Cluster chain of FIRMWARE.BIN */
for (uint16_t i = 0; i < FILE_CLUSTERS(FIRMWARE_FILE_SIZE_BYTES); i++)
UpdateFAT12ClusterEntry(BlockBuffer, i+2, i+3);
for (uint16_t i = 0; i <= FILE_CLUSTERS(FIRMWARE_FILE_SIZE_BYTES); i++)
{
uint16_t CurrentCluster = FirmwareFileEntries[DISK_FILE_ENTRY_FirmwareMSDOS].MSDOS_File.StartingCluster + i;
uint16_t NextCluster = CurrentCluster + 1;
/* Mark last cluster as end of file */
if (i == FILE_CLUSTERS(FIRMWARE_FILE_SIZE_BYTES))
NextCluster = 0xFFF;
UpdateFAT12ClusterEntry(BlockBuffer, CurrentCluster, NextCluster);
}
/* Mark last cluster as end of file */
UpdateFAT12ClusterEntry(BlockBuffer, FILE_CLUSTERS(FIRMWARE_FILE_SIZE_BYTES) + 1, 0xFFF);
break;
case 3: /* Block 3: Root file entries */
case DISK_BLOCK_RootFilesBlock:
memcpy(BlockBuffer, FirmwareFileEntries, sizeof(FirmwareFileEntries));
break;
default: /* Blocks 4 onwards: Data allocation section */
if ((BlockNumber >= 4) && (BlockNumber < (4 + FILE_SECTORS(FIRMWARE_FILE_SIZE_BYTES))))
{
#if (FLASHEND > 0xFFFF)
uint32_t ReadFlashAddress = (uint32_t)(BlockNumber - 4) * SECTOR_SIZE_BYTES;
for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i++)
BlockBuffer[i] = pgm_read_byte_far(ReadFlashAddress++);
#else
uint16_t ReadFlashAddress = (uint16_t)(BlockNumber - 4) * SECTOR_SIZE_BYTES;
for (uint16_t i = 0; i < SECTOR_SIZE_BYTES; i++)
BlockBuffer[i] = pgm_read_byte(ReadFlashAddress++);
#endif
}
ReadWriteFirmwareFileBlock(BlockNumber, BlockBuffer, true);
break;
}
@ -275,38 +327,3 @@ static void ReadVirtualBlock(const uint16_t BlockNumber)
Endpoint_Write_Stream_LE(BlockBuffer, sizeof(BlockBuffer), NULL);
Endpoint_ClearIN();
}
/** Writes a number of blocks to the virtual FAT file system, from the host
* PC via the USB Mass Storage interface.
*
* \param[in] BlockAddress Data block starting address for the write sequence
* \param[in] TotalBlocks Number of blocks of data to write
*/
void VirtualFAT_WriteBlocks(const uint16_t BlockAddress,
uint16_t TotalBlocks)
{
uint16_t CurrentBlock = (uint16_t)BlockAddress;
/* Emulated FAT is performed per-block, pass each requested block index
* to the emulated FAT block write function */
while (TotalBlocks--)
WriteVirtualBlock(CurrentBlock++);
}
/** Reads a number of blocks from the virtual FAT file system, and sends them
* to the host PC via the USB Mass Storage interface.
*
* \param[in] BlockAddress Data block starting address for the read sequence
* \param[in] TotalBlocks Number of blocks of data to read
*/
void VirtualFAT_ReadBlocks(const uint16_t BlockAddress,
uint16_t TotalBlocks)
{
uint16_t CurrentBlock = (uint16_t)BlockAddress;
/* Emulated FAT is performed per-block, pass each requested block index
* to the emulated FAT block read function */
while (TotalBlocks--)
ReadVirtualBlock(CurrentBlock++);
}

29
Bootloaders/MassStorage/Lib/VirtualFAT.h
View File

@ -121,6 +121,23 @@
#define FAT_ORDINAL_LAST_ENTRY (1 << 6)
//@}
/* Enums: */
enum
{
DISK_FILE_ENTRY_VolumeID = 0,
DISK_FILE_ENTRY_FirmwareLFN = 1,
DISK_FILE_ENTRY_FirmwareMSDOS = 2,
};
enum
{
DISK_BLOCK_BootBlock = 0,
DISK_BLOCK_FATBlock1 = 1,
DISK_BLOCK_FATBlock2 = 2,
DISK_BLOCK_RootFilesBlock = 3,
DISK_BLOCK_DataStartBlock = 4,
};
/* Type Definitions: */
/** FAT boot block structure definition, used to identify the core
* parameters of a FAT filesystem stored on a disk.
@ -213,13 +230,13 @@
static void UpdateFAT12ClusterEntry(uint8_t* const FATTable,
const uint16_t Index,
const uint16_t ChainEntry) AUX_BOOT_SECTION;
static void WriteVirtualBlock(const uint16_t BlockNumber) AUX_BOOT_SECTION;
static void ReadVirtualBlock(const uint16_t BlockNumber) AUX_BOOT_SECTION;
static void ReadWriteFirmwareFileBlock(const uint16_t BlockNumber,
uint8_t* BlockBuffer,
const bool Read) AUX_BOOT_SECTION;
#endif
void VirtualFAT_WriteBlocks(const uint16_t BlockAddress,
uint16_t TotalBlocks) AUX_BOOT_SECTION;
void VirtualFAT_WriteBlock(const uint16_t BlockNumber) AUX_BOOT_SECTION;
void VirtualFAT_ReadBlock(const uint16_t BlockNumber) AUX_BOOT_SECTION;
void VirtualFAT_ReadBlocks(const uint16_t BlockAddress,
uint16_t TotalBlocks) AUX_BOOT_SECTION;
#endif