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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** FileX Component */
/** */
/** Utility */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#ifdef FX_ENABLE_EXFAT
#include "fx_utility.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_utility_exFAT_system_area_format PORTABLE C */
/* 6.1.10 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function formats system area for exFAT. */
/* */
/* INPUT */
/* */
/* media_ptr Pointer to media control block*/
/* boundary_unit Data area alignment in sectors*/
/* system_area_checksum_ptr Pointer system area checksum */
/* memory_ptr Pointer to work buffer */
/* memory_size Size of the work buffer */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* _fx_utility_memory_set Set memory */
/* _fx_utility_exFAT_system_sector_write Write exFAT format sector */
/* _fx_utility_32_unsigned_write Write 32-bit word */
/* _fx_utility_16_unsigned_write Write 16-bit word */
/* */
/* */
/* CALLED BY */
/* */
/* _fx_media_exFAT_format */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), */
/* resulting in version 6.1 */
/* 01-31-2022 Bhupendra Naphade Modified comment(s), replaced */
/* sector size constant, */
/* resulting in version 6.1.10 */
/* */
/**************************************************************************/
UINT _fx_utility_exFAT_system_area_format(FX_MEDIA *media_ptr, ULONG boundary_unit,
ULONG *system_area_checksum_ptr,
UCHAR *memory_ptr, UINT memory_size)
{
UINT counter;
UINT i;
UINT sector_offset = 0;
UINT status;
UCHAR *system_area_buffer = NULL;
/* Is the memory size large enough? */
if (memory_size < media_ptr -> fx_media_bytes_per_sector)
{
/* No, return an error. */
return(FX_PTR_ERROR);
}
/* Setup pointer to system area buffer. */
system_area_buffer = memory_ptr;
/* Align the boundary unit. */
boundary_unit = ALIGN_UP(boundary_unit, 128);
/* Clear work buffer. */
_fx_utility_memory_set(system_area_buffer, 0x00, media_ptr -> fx_media_bytes_per_sector);
/* Add signature to System area sectors without boot, OEM, reserved and checksum sector. */
system_area_buffer[media_ptr -> fx_media_bytes_per_sector - 2] = FX_SIG_BYTE_1;
system_area_buffer[media_ptr -> fx_media_bytes_per_sector - 1] = FX_SIG_BYTE_2;
/* Loop to write all the extended boot sectors. */
for (counter = 0; counter < (FX_EXFAT_FAT_OEM_PARAM_OFFSET - FX_EXFAT_FAT_EXT_BOOT_SECTOR_OFFSET); counter++)
{
/* Loop to calculate the checksum for System Area */
for (i = 0; i < media_ptr -> fx_media_bytes_per_sector; i++)
{
/* Calculate the checksum using the algorithm specified in the specification. */
/* Right rotate the checksum by one bit position and add the data. */
*system_area_checksum_ptr = ((*system_area_checksum_ptr >> 1) | (*system_area_checksum_ptr << 31)) +
(ULONG)system_area_buffer[i];
}
/* Write out the extended boot sector. */
status = _fx_utility_exFAT_system_sector_write(media_ptr, system_area_buffer,
(ULONG64) (FX_EXFAT_FAT_EXT_BOOT_SECTOR_OFFSET + counter),
((ULONG) 1), FX_BOOT_SECTOR);
/* Determine if the write was successful. */
if (status != FX_SUCCESS)
{
return(status);
}
/* Write out the extended boot sector in the backup region. */
status = _fx_utility_exFAT_system_sector_write(media_ptr, system_area_buffer,
(ULONG64) (FX_EXFAT_FAT_EXT_BOOT_SECTOR_OFFSET + counter + FX_EXFAT_FAT_MAIN_SYSTEM_AREA_SIZE),
((ULONG) 1), FX_BOOT_SECTOR);
/* Determine if the write was successful. */
if (status != FX_SUCCESS)
{
return(status);
}
}
/* Add OEM - Flash parameters. */
system_area_buffer[media_ptr -> fx_media_bytes_per_sector - 2] = 0;
system_area_buffer[media_ptr -> fx_media_bytes_per_sector - 1] = 0;
/* GUID 0A0C7E46-3399-4021-90C8-FA6D389C4BA2 */
_fx_utility_32_unsigned_write(&(system_area_buffer[sector_offset]), 0x0A0C7E46);
_fx_utility_16_unsigned_write(&(system_area_buffer[sector_offset + 4]), 0x3399);
_fx_utility_16_unsigned_write(&(system_area_buffer[sector_offset + 6]), 0x4021);
system_area_buffer[sector_offset + 8] = 0x90; system_area_buffer[sector_offset + 9] = 0xC8;
system_area_buffer[sector_offset + 10] = 0xFA; system_area_buffer[sector_offset + 11] = 0x6D;
system_area_buffer[sector_offset + 12] = 0x38; system_area_buffer[sector_offset + 13] = 0x9C;
system_area_buffer[sector_offset + 14] = 0x4B; system_area_buffer[sector_offset + 15] = 0xA2;
/* Add EraseBlockSize. */
_fx_utility_32_unsigned_write(&(system_area_buffer[sector_offset + 16]), boundary_unit / 2);
/* Write out the OEM parameters sector. */
status = _fx_utility_exFAT_system_sector_write(media_ptr, system_area_buffer,
FX_EXFAT_FAT_OEM_PARAM_OFFSET,
1, FX_BOOT_SECTOR);
/* Determine if the write was successful. */
if (status != FX_SUCCESS)
{
return(status);
}
/* Write out the OEM parameters sector in the backup region. */
status = _fx_utility_exFAT_system_sector_write(media_ptr, system_area_buffer,
FX_EXFAT_FAT_OEM_PARAM_OFFSET + FX_EXFAT_FAT_MAIN_SYSTEM_AREA_SIZE,
1, FX_BOOT_SECTOR);
/* Determine if the write was successful. */
if (status != FX_SUCCESS)
{
return(status);
}
/* Loop to calculate checksum for System Area. */
for (counter = 0; counter < media_ptr -> fx_media_bytes_per_sector; counter++)
{
/* Calculate the checksum using the algorithm specified in the specification. */
/* Right rotate the checksum by one bit position and add the data. */
*system_area_checksum_ptr = ((*system_area_checksum_ptr >> 1) | (*system_area_checksum_ptr << 31)) +
(ULONG)system_area_buffer[counter];
}
/* Clear work buffer. */
_fx_utility_memory_set(system_area_buffer, 0x00, media_ptr -> fx_media_bytes_per_sector);
/* Loop to calculate checksum for System Area. */
for (counter = 0; counter < media_ptr -> fx_media_bytes_per_sector; counter++)
{
/* Calculate the checksum using the algorithm specified in the specification. */
/* Right rotate the checksum by one bit position and add the data. */
*system_area_checksum_ptr = ((*system_area_checksum_ptr >> 1) | (*system_area_checksum_ptr << 31)) +
(ULONG)system_area_buffer[counter];
}
/* Write out the boot checksum sector. */
status = _fx_utility_exFAT_system_sector_write(media_ptr, system_area_buffer,
FX_EXFAT_FAT_OEM_PARAM_OFFSET + 1,
1, FX_BOOT_SECTOR);
/* Determine if the write was successful. */
if (status != FX_SUCCESS)
{
return(status);
}
/* Write out the boot checksum sector in the backup region. */
status = _fx_utility_exFAT_system_sector_write(media_ptr, system_area_buffer,
FX_EXFAT_FAT_OEM_PARAM_OFFSET + 1 + FX_EXFAT_FAT_MAIN_SYSTEM_AREA_SIZE,
1, FX_BOOT_SECTOR);
/* Return completion status. */
return(status);
}
#endif
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