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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 */
/** */
/** Fault Tolerant */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
#include "fx_api.h"
#include "fx_utility.h"
#include "fx_fault_tolerant.h"
#ifdef FX_ENABLE_FAULT_TOLERANT
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_fault_tolerant_set_FAT_chain PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function sets data of FAT chain. */
/* */
/* INPUT */
/* */
/* media_ptr Media control block pointer */
/* use_bitmap Whether or not the orignal */
/* FAT chain uses bitmap */
/* insertion_front Previous cluster of head */
/* new_head_cluster Head cluster of new chain */
/* origianl_head_cluster Head cluster of the original */
/* chain */
/* insertion_back next cluster of chain tail */
/* */
/* OUTPUT */
/* */
/* return status */
/* */
/* CALLS */
/* */
/* _fx_utility_16_unsigned_write Write a USHORT from memory */
/* _fx_utility_32_unsigned_write Write a ULONG from memory */
/* _fx_fault_tolerant_calculate_checksum Compute Checksum of data */
/* _fx_fault_tolerant_write_log_file Write log file */
/* */
/* CALLED BY */
/* */
/* _fx_file_allocate */
/* _fx_file_best_effort_allocate */
/* _fx_file_delete */
/* _fx_file_truncate_release */
/* _fx_file_write */
/* */
/* 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 */
/* */
/**************************************************************************/
UINT _fx_fault_tolerant_set_FAT_chain(FX_MEDIA *media_ptr, UINT use_bitmap, ULONG insertion_front,
ULONG new_head_cluster, ULONG original_head_cluster,
ULONG insertion_back)
{
UINT status;
USHORT checksum;
UCHAR flag = FX_FAULT_TOLERANT_FLAG_FAT_CHAIN_VALID;
FX_FAULT_TOLERANT_FAT_CHAIN *FAT_chain;
/* Set FAT chain pointer. */
FAT_chain = (FX_FAULT_TOLERANT_FAT_CHAIN *)(media_ptr -> fx_media_fault_tolerant_memory_buffer + FX_FAULT_TOLERANT_FAT_CHAIN_OFFSET);
#ifdef FX_ENABLE_EXFAT
/* Check flag for bitmap. */
if (use_bitmap == FX_TRUE)
{
flag |= FX_FAULT_TOLERANT_FLAG_BITMAP_USED;
}
#else
/* Parameters not used. Avoid compiler warnings. */
FX_PARAMETER_NOT_USED(use_bitmap);
#endif /* FX_ENABLE_EXFAT */
/* Reset checksum first. */
_fx_utility_16_unsigned_write((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_checksumm, 0);
/* Set clusters. */
_fx_utility_32_unsigned_write((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_insertion_front, insertion_front);
_fx_utility_32_unsigned_write((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_head_new, new_head_cluster);
_fx_utility_32_unsigned_write((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_head_original, original_head_cluster);
_fx_utility_32_unsigned_write((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_insertion_back, insertion_back);
_fx_utility_32_unsigned_write((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_next_deletion, FX_FREE_CLUSTER);
/* Set flag and reserved. */
FAT_chain -> fx_fault_tolerant_FAT_chain_flag = flag;
FAT_chain -> fx_fault_tolerant_FAT_chain_reserved = (UCHAR)0;
/* Calculate checksum. */
checksum = _fx_fault_tolerant_calculate_checksum((UCHAR *)FAT_chain, FX_FAULT_TOLERANT_FAT_CHAIN_SIZE);
_fx_utility_16_unsigned_write((UCHAR *)&FAT_chain -> fx_fault_tolerant_FAT_chain_checksumm, checksum);
/* Write the log header and FAT chain. */
status = _fx_fault_tolerant_write_log_file(media_ptr, 0);
/* Return the status. */
return(status);
}
#endif /* FX_ENABLE_FAULT_TOLERANT */
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