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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 */
/** */
/** Media */
/** */
/**************************************************************************/
/**************************************************************************/
#define FX_SOURCE_CODE
/* Include necessary system files. */
#include "fx_api.h"
#include "fx_media.h"
#include "fx_utility.h"
/* Define global variables necessary for formatting. */
/* Define OEM Name. This name must be 8 characters long and be blank padded.
The default may be changed by modifying this file or calling the
fx_media_format_oem_name_set utility prior to calling fx_media_format. */
UCHAR _fx_media_format_oem_name[8] = "EL FILEX";
/* Define the default media type. This default may be changed by modifying
this file or calling the fx_media_format_type_set utility prior to calling
fx_media_format. */
UCHAR _fx_media_format_media_type = 0xF8;
/* Define the default volume ID. This default may be changed by modifying
this file or calling the fx_media_format_volume_id_set utility prior to calling
fx_media_format. */
ULONG _fx_media_format_volume_id = 1;
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _fx_media_format PORTABLE C */
/* 6.1.8 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function creates a FAT12/16/32 format with raw calls to the */
/* I/O driver. It can and must be called before the fx_media_open */
/* and is designed to utilize the same underlying FileX driver. */
/* */
/* INPUT */
/* */
/* media_ptr Pointer to media control block*/
/* (does not need to be opened)*/
/* driver Pointer to FileX driver (must */
/* be able to field requests */
/* prior to opening) */
/* driver_info_ptr Optional information pointer */
/* memory_ptr Pointer to memory used by the */
/* FileX for this media. */
/* memory_size Size of media memory - must */
/* at least 512 bytes and */
/* one sector size. */
/* volume_name Name of the volume */
/* number_of_fats Number of FAT tables */
/* directory_entries Number of directory entries */
/* hidden_sectors Number of hidden sectors */
/* total_sectors Total number of sectors */
/* bytes_per_sector Number of bytes per sector */
/* sectors_per_cluster Number of sectors per cluster */
/* heads Number of heads */
/* sectors_per_track Number of sectors per track */
/* */
/* OUTPUT */
/* */
/* Completion Status */
/* */
/* CALLS */
/* */
/* Media driver */
/* _fx_utility_16_unsigned_write Write 16-bit unsigned */
/* _fx_utility_32_unsigned_write Write 32-bit unsigned */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 William E. Lamie Modified comment(s), and */
/* added conditional to */
/* disable force memset, */
/* resulting in version 6.1 */
/* 03-02-2021 William E. Lamie Modified comment(s), */
/* resulting in version 6.1.5 */
/* 08-02-2021 Bhupendra Naphade Modified comment(s), and */
/* updated boot write logic, */
/* resulting in version 6.1.8 */
/* */
/**************************************************************************/
UINT _fx_media_format(FX_MEDIA *media_ptr, VOID (*driver)(FX_MEDIA *media), VOID *driver_info_ptr, UCHAR *memory_ptr, UINT memory_size,
CHAR *volume_name, UINT number_of_fats, UINT directory_entries, UINT hidden_sectors,
ULONG total_sectors, UINT bytes_per_sector, UINT sectors_per_cluster,
UINT heads, UINT sectors_per_track)
{
UCHAR *byte_ptr;
UINT reserved_sectors, i, j, root_sectors, total_clusters, bytes_needed;
UINT sectors_per_fat, f, s;
/* Create & write bootrecord from drive geometry information. */
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_MEDIA_FORMAT, media_ptr, directory_entries, total_sectors, sectors_per_cluster, FX_TRACE_MEDIA_EVENTS, 0, 0)
/* Validate bytes per sector value: greater than zero and no more than 4096. */
if((bytes_per_sector == 0) || (bytes_per_sector > 4096))
return(FX_SECTOR_INVALID);
/* Validate sectors per cluster value: greater than zero and no more than 128. */
if((sectors_per_cluster == 0) || (sectors_per_cluster > 128))
return(FX_SECTOR_INVALID);
/* Setup driver pointer and memory information. */
media_ptr -> fx_media_driver_entry = driver;
media_ptr -> fx_media_memory_buffer = (UCHAR *)memory_ptr;
media_ptr -> fx_media_memory_size = memory_size;
/* Store geometry information in media record - driver needs this. */
media_ptr -> fx_media_bytes_per_sector = bytes_per_sector;
media_ptr -> fx_media_sectors_per_track = sectors_per_track;
media_ptr -> fx_media_heads = heads;
media_ptr -> fx_media_hidden_sectors = hidden_sectors;
/* Initialize the supplied media I/O driver. First, build the
initialize driver request. */
media_ptr -> fx_media_driver_request = FX_DRIVER_INIT;
media_ptr -> fx_media_driver_status = FX_IO_ERROR;
media_ptr -> fx_media_driver_info = driver_info_ptr;
media_ptr -> fx_media_driver_write_protect = FX_FALSE;
media_ptr -> fx_media_driver_free_sector_update = FX_FALSE;
media_ptr -> fx_media_driver_data_sector_read = FX_FALSE;
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_INIT, media_ptr, 0, 0, 0, FX_TRACE_INTERNAL_EVENTS, 0, 0)
/* Call the specified I/O driver with the initialize request. */
(media_ptr -> fx_media_driver_entry) (media_ptr);
/* Determine if the I/O driver initialized successfully. */
if (media_ptr -> fx_media_driver_status != FX_SUCCESS)
{
/* Return the driver error status. */
return(FX_IO_ERROR);
}
/* Setup driver buffer memory. */
media_ptr -> fx_media_driver_buffer = memory_ptr;
/* Move the buffer pointer into a local copy. */
byte_ptr = media_ptr -> fx_media_driver_buffer;
#ifndef FX_DISABLE_FORCE_MEMORY_OPERATION
/* Clear the buffer record out, assuming it is large enough for one sector. */
for (i = 0; i < bytes_per_sector; i++)
{
/* Clear each byte of the boot record. */
byte_ptr[i] = (UCHAR)0;
}
#else
_fx_utility_memory_set(byte_ptr, 0, bytes_per_sector);
#endif /* FX_DISABLE_FORCE_MEMORY_OPERATION */
/* Set jump instruction at the beginning of the sector. */
byte_ptr[0] = (UCHAR)0xEB;
byte_ptr[1] = (UCHAR)0x34;
byte_ptr[2] = (UCHAR)0x90;
/* Set the OEM name in the boot record. */
for (i = 0; i < 8; i++)
{
/* Copy a character from the OEM name. */
byte_ptr[i + 3] = _fx_media_format_oem_name[i];
}
/* Set the media type in the boot record. */
byte_ptr[FX_MEDIA_TYPE] = _fx_media_format_media_type;
/* Set the number of bytes per sector. */
_fx_utility_16_unsigned_write(&byte_ptr[FX_BYTES_SECTOR], bytes_per_sector);
/* Set the number of sectors per track. */
_fx_utility_16_unsigned_write(&byte_ptr[FX_SECTORS_PER_TRK], sectors_per_track);
/* Set the number of heads. */
_fx_utility_16_unsigned_write(&byte_ptr[FX_HEADS], heads);
#ifdef FX_FORCE_512_BYTE_BOOT_SECTOR
/* Calculate the number of reserved sectors. If sector size is smaller than 512 bytes, there will be
reserved sectors, otherwise assumed that only the sector containing bootrecord is reserved. */
if (bytes_per_sector < 512)
{
reserved_sectors = 512 / bytes_per_sector;
}
else
{
reserved_sectors = 1;
}
#else
/* The boot sector is the only reserved sector. */
reserved_sectors = 1;
#endif
/* Calculate the maximum clusters.... This is actually greater than the actual since the FAT
sectors have yet to be accounted for. */
total_clusters = (total_sectors - reserved_sectors - ((directory_entries * FX_DIR_ENTRY_SIZE) + (bytes_per_sector - 1)) / bytes_per_sector) / sectors_per_cluster;
/* Calculate the maximum number of FAT sectors necessary for FAT12. */
if (total_clusters % 2)
{
bytes_needed = (total_clusters + total_clusters / 2) + 1;
}
else
{
bytes_needed = (total_clusters + total_clusters / 2);
}
sectors_per_fat = bytes_needed / bytes_per_sector;
if (bytes_needed % bytes_per_sector)
{
sectors_per_fat++;
}
/* Now adjust the total clusters by the number of sectors per FAT. */
total_clusters = total_clusters - ((sectors_per_fat * number_of_fats) + (sectors_per_cluster - 1)) / sectors_per_cluster;
/* Is the total cluster count greater than the FAT12 maximum? */
if (total_clusters >= FX_12_BIT_FAT_SIZE)
{
/* Yes, too big for FAT12, we need to evaluate for FAT16. */
/* Reset the maximum clusters.... This is actually greater than the actual since the FAT
sectors have yet to be accounted for. */
total_clusters = (total_sectors - reserved_sectors - ((directory_entries * FX_DIR_ENTRY_SIZE) + (bytes_per_sector - 1)) / bytes_per_sector) / sectors_per_cluster;
/* Calculate 16-bit FAT is present. Each cluster requires a 2 byte entry in the FAT table. */
sectors_per_fat = (total_clusters * 2) / bytes_per_sector;
if ((total_clusters * 2) % bytes_per_sector)
{
sectors_per_fat++;
}
/* Now adjust the total clusters by the number of sectors per FAT. */
total_clusters = total_clusters - ((sectors_per_fat * number_of_fats) + (sectors_per_cluster - 1)) / sectors_per_cluster;
/* Is the total cluster count greater than the FAT16 maximum? */
if (total_clusters >= FX_16_BIT_FAT_SIZE)
{
/* Yes, FAT32 is present. */
/* Allocate room for the FAT32 additional information sector. This contains useful information
such as the number of available clusters between successive mounting of the media. */
if (bytes_per_sector == 512)
{
/* Write sector number 1 to the additional information sector. */
_fx_utility_16_unsigned_write(&byte_ptr[48], 1);
/* Increment the reserved sectors count, since this will count as a reserved sector. */
reserved_sectors++;
}
else
{
/* Write value to indicate there is no additional information sector. */
_fx_utility_16_unsigned_write(&byte_ptr[48], 0xFFFF);
}
/* Allocate the first cluster to the root directory. */
_fx_utility_32_unsigned_write(&byte_ptr[FX_ROOT_CLUSTER_32], FX_FAT_ENTRY_START);
/* Determine if the number of root directory entries should be modified. */
directory_entries = (sectors_per_cluster * bytes_per_sector) / FX_DIR_ENTRY_SIZE;
/* Reset the total_clusters for the FAT32 calculation. */
total_clusters = (total_sectors - reserved_sectors) / sectors_per_cluster;
/* 32-bit FAT is present. Each cluster requires a 4 byte entry in the FAT table. */
sectors_per_fat = (total_clusters * 4) / bytes_per_sector;
if ((total_clusters * 4) % bytes_per_sector)
{
sectors_per_fat++;
}
/* Now adjust the total clusters by the number of sectors per FAT. */
total_clusters = total_clusters - ((sectors_per_fat * number_of_fats) + (sectors_per_cluster - 1)) / sectors_per_cluster;
}
}
/* Set sectors per FAT type. */
if (total_clusters < FX_16_BIT_FAT_SIZE)
{
/* Set the number of sectors per FAT12/16. */
_fx_utility_16_unsigned_write(&byte_ptr[FX_SECTORS_PER_FAT], sectors_per_fat);
/* Set the signature. */
byte_ptr[FX_BOOT_SIG] = 0x29;
/* Setup the volume ID. */
_fx_utility_32_unsigned_write(&byte_ptr[FX_VOLUME_ID], _fx_media_format_volume_id);
}
else
{
/* Set the number of sectors per FAT32. */
_fx_utility_32_unsigned_write(&byte_ptr[FX_SECTORS_PER_FAT_32], sectors_per_fat);
/* Set the signature. */
byte_ptr[FX_BOOT_SIG_32] = 0x29;
/* Setup the volume ID. */
_fx_utility_32_unsigned_write(&byte_ptr[FX_VOLUME_ID_32], _fx_media_format_volume_id);
}
/* Set the total number of sectors. */
if (total_sectors < (ULONG)0xFFFF)
{
/* Write the 16-bit total sector field. */
_fx_utility_16_unsigned_write(&byte_ptr[FX_SECTORS], (UINT)(total_sectors));
/* Set the number of huge sectors. */
_fx_utility_32_unsigned_write(&byte_ptr[FX_HUGE_SECTORS], 0);
}
else
{
/* Write the 16-bit total sector field as 0. */
_fx_utility_16_unsigned_write(&byte_ptr[FX_SECTORS], (UINT)0);
/* Set the number of huge sectors. */
_fx_utility_32_unsigned_write(&byte_ptr[FX_HUGE_SECTORS], total_sectors);
}
/* Set the number of reserved sectors. */
_fx_utility_16_unsigned_write(&byte_ptr[FX_RESERVED_SECTORS], reserved_sectors);
/* Set the number of sectors per cluster */
byte_ptr[FX_SECTORS_CLUSTER] = (UCHAR)sectors_per_cluster;
/* Set the number of FATs. */
byte_ptr[FX_NUMBER_OF_FATS] = (UCHAR)number_of_fats;
/* Set the number of hidden sectors. */
_fx_utility_32_unsigned_write(&byte_ptr[FX_HIDDEN_SECTORS], hidden_sectors);
/* Determine if a FAT12 or FAT16 is present. If FAT32 is present, these fields are left alone! */
if (total_clusters < FX_16_BIT_FAT_SIZE)
{
/* Yes, set the number of root directory entries. */
_fx_utility_16_unsigned_write(&byte_ptr[FX_ROOT_DIR_ENTRIES], directory_entries);
}
/* Now setup the volume label. */
if (total_clusters < FX_16_BIT_FAT_SIZE)
{
/* FAT12/16 volume label offset. */
j = FX_VOLUME_LABEL;
}
else
{
/* FAT32 volume label offset. */
j = FX_VOLUME_LABEL_32;
}
i = 0;
while (i < 11)
{
/* Determine if it is NULL. */
if (volume_name[i] == 0)
{
/* Yes, the copying is finished. */
break;
}
/* Otherwise, copy byte of volume name into boot record. */
byte_ptr[j + i] = (UCHAR)volume_name[i];
/* Increment byte position. */
i++;
}
/* Now blank-pad the remainder of the volume name. */
#ifndef FX_DISABLE_FORCE_MEMORY_OPERATION
while (i < 11)
{
byte_ptr[j + i] = (UCHAR)' ';
i++;
}
#else
_fx_utility_memory_set(&byte_ptr[j + i], ' ', (11 - i));
#endif /* FX_DISABLE_FORCE_MEMORY_OPERATION */
#ifdef FX_FORCE_512_BYTE_BOOT_SECTOR
/* Set bootrecord signature. */
byte_ptr[510] = 0x55;
byte_ptr[511] = 0xAA;
#else
/* Set bootrecord signature. */
byte_ptr[bytes_per_sector - 2] = 0x55;
byte_ptr[bytes_per_sector - 1] = 0xAA;
#endif
/* Select the boot record write command. */
media_ptr -> fx_media_driver_request = FX_DRIVER_BOOT_WRITE;
media_ptr -> fx_media_driver_system_write = FX_TRUE;
media_ptr -> fx_media_driver_sectors = 1;
media_ptr -> fx_media_driver_sector_type = FX_BOOT_SECTOR;
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_BOOT_WRITE, media_ptr, memory_ptr, 0, 0, FX_TRACE_INTERNAL_EVENTS, 0, 0)
/* Write out the bootrecord */
(driver)(media_ptr);
/* Clear the write flag. */
media_ptr -> fx_media_driver_system_write = FX_FALSE;
/* Determine if it was successful. */
if (media_ptr -> fx_media_driver_status != FX_SUCCESS)
{
return(FX_IO_ERROR);
}
/* Calculate the number of root sectors. */
root_sectors = ((directory_entries * FX_DIR_ENTRY_SIZE) + bytes_per_sector - 1) / bytes_per_sector;
/* Determine if FAT32 is present AND if the bytes per sector is large enough to have
a FSINFO sector. */
if ((total_clusters >= FX_16_BIT_FAT_SIZE) && (bytes_per_sector == 512))
{
#ifndef FX_DISABLE_FORCE_MEMORY_OPERATION
/* Clear sector buffer. */
for (i = 0; i < bytes_per_sector; i++)
{
byte_ptr[i] = (CHAR)0;
}
#else
_fx_utility_memory_set(byte_ptr, 0, bytes_per_sector);
#endif /* FX_DISABLE_FORCE_MEMORY_OPERATION */
/* Build the FSINFO fields. */
/* Build first signature word, used to help verify this is a FSINFO sector. */
byte_ptr[0] = 0x52;
byte_ptr[1] = 0x52;
byte_ptr[2] = 0x61;
byte_ptr[3] = 0x41;
/* Build the next signature word, this too is used to help verify that this is a FSINFO sector. */
byte_ptr[484] = 0x72;
byte_ptr[485] = 0x72;
byte_ptr[486] = 0x41;
byte_ptr[487] = 0x61;
/* Build the final signature word, this too is used to help verify that this is a FSINFO sector. */
byte_ptr[508] = 0x55;
byte_ptr[509] = 0xAA;
/* Setup the total available clusters on the media. We need to subtract 1 for the FAT32 root directory. */
_fx_utility_32_unsigned_write(&byte_ptr[488], (total_clusters - 1));
/* Setup the starting free cluster to 3, since cluster 2 is reserved for the FAT32 root directory. */
_fx_utility_32_unsigned_write(&byte_ptr[492], 3);
/* Now write the FSINFO sector to the media. */
media_ptr -> fx_media_driver_logical_sector = 1;
media_ptr -> fx_media_driver_request = FX_DRIVER_WRITE;
media_ptr -> fx_media_driver_sectors = 1;
media_ptr -> fx_media_driver_system_write = FX_TRUE;
media_ptr -> fx_media_driver_sector_type = FX_BOOT_SECTOR;
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_WRITE, media_ptr, 1, 1, memory_ptr, FX_TRACE_INTERNAL_EVENTS, 0, 0)
/* Write out the sector. */
(driver)(media_ptr);
/* Clear the system write flag. */
media_ptr -> fx_media_driver_system_write = FX_FALSE;
/* Determine if it was successful. */
if (media_ptr -> fx_media_driver_status != FX_SUCCESS)
{
return(FX_IO_ERROR);
}
}
/* At this point we need set up first to FAT entries and clear the remaining FAT sectors area. */
/* Loop through number of FATs. The first is the only one used. */
for (f = 0; f < number_of_fats; f++)
{
/* Loop through all the sectors in this FAT. */
for (s = 0; s < sectors_per_fat; s++)
{
if (s == 0)
{
/* Reserve the first two FAT table entries. */
if (total_clusters < FX_12_BIT_FAT_SIZE)
{
/* Reserve the first two FAT-12 entries. */
byte_ptr[0] = (UCHAR)0x0F;
byte_ptr[1] = (UCHAR)0x0F;
byte_ptr[2] = (UCHAR)0xFF;
/* Start clearing at FAT entry 3. */
i = 3;
}
else if (total_clusters < FX_16_BIT_FAT_SIZE)
{
/* Reserve the first two FAT-16 entries. */
byte_ptr[0] = (UCHAR)0xF0;
byte_ptr[1] = (UCHAR)0x00;
byte_ptr[2] = (UCHAR)0xFF;
byte_ptr[3] = (UCHAR)0xFF;
/* Start clearing at FAT entry 3. */
i = 4;
}
else
{
/* Reserve the first two FAT-32 entries. */
byte_ptr[0] = (UCHAR)0xF0;
byte_ptr[1] = (UCHAR)0x00;
byte_ptr[2] = (UCHAR)0x00;
byte_ptr[3] = (UCHAR)0x00;
byte_ptr[4] = (UCHAR)0xFF;
byte_ptr[5] = (UCHAR)0xFF;
byte_ptr[6] = (UCHAR)0xFF;
byte_ptr[7] = (UCHAR)0xFF;
/* Preallocate the first cluster for the root directory. */
byte_ptr[8] = (UCHAR)0xFF;
byte_ptr[9] = (UCHAR)0xFF;
byte_ptr[10] = (UCHAR)0xFF;
byte_ptr[11] = (UCHAR)0x0F;
/* Start clearing at FAT entry 3. */
i = 12;
}
}
else
{
i = 0;
}
#ifndef FX_DISABLE_FORCE_MEMORY_OPERATION
/* Clear remainder of sector buffer. */
for (; i < bytes_per_sector; i++)
{
byte_ptr[i] = (CHAR)0;
}
#else
_fx_utility_memory_set(&byte_ptr[i], 0, (bytes_per_sector - i));
#endif /* FX_DISABLE_FORCE_MEMORY_OPERATION */
/* Build sector write command. */
media_ptr -> fx_media_driver_logical_sector = reserved_sectors + (f * sectors_per_fat) + s;
media_ptr -> fx_media_driver_request = FX_DRIVER_WRITE;
media_ptr -> fx_media_driver_sectors = 1;
media_ptr -> fx_media_driver_system_write = FX_TRUE;
media_ptr -> fx_media_driver_sector_type = FX_FAT_SECTOR;
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_WRITE, media_ptr, media_ptr -> fx_media_driver_logical_sector, 1, memory_ptr, FX_TRACE_INTERNAL_EVENTS, 0, 0)
/* Write out the sector. */
(driver)(media_ptr);
/* Clear the system write flag. */
media_ptr -> fx_media_driver_system_write = FX_FALSE;
/* Determine if it was successful. */
if (media_ptr -> fx_media_driver_status != FX_SUCCESS)
{
return(FX_IO_ERROR);
}
}
}
#ifndef FX_DISABLE_FORCE_MEMORY_OPERATION
/* Clear sector buffer. */
for (i = 0; i < bytes_per_sector; i++)
{
byte_ptr[i] = (CHAR)0;
}
#else
_fx_utility_memory_set(byte_ptr, 0, bytes_per_sector);
#endif /* FX_DISABLE_FORCE_MEMORY_OPERATION */
/* Now clear the root directory sectors. */
for (s = 0; s < root_sectors; s++)
{
/* Build sector write command. */
media_ptr -> fx_media_driver_logical_sector = reserved_sectors + (number_of_fats * sectors_per_fat) + s;
media_ptr -> fx_media_driver_request = FX_DRIVER_WRITE;
media_ptr -> fx_media_driver_sectors = 1;
media_ptr -> fx_media_driver_system_write = FX_TRUE;
media_ptr -> fx_media_driver_sector_type = FX_DIRECTORY_SECTOR;
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_WRITE, media_ptr, media_ptr -> fx_media_driver_logical_sector, 1, memory_ptr, FX_TRACE_INTERNAL_EVENTS, 0, 0)
/* Write out the sector. */
(driver)(media_ptr);
/* Clear the write flag. */
media_ptr -> fx_media_driver_system_write = FX_FALSE;
/* Determine if it was successful. */
if (media_ptr -> fx_media_driver_status != FX_SUCCESS)
{
return(FX_IO_ERROR);
}
}
/* Build the "uninitialize" I/O driver request. */
media_ptr -> fx_media_driver_request = FX_DRIVER_UNINIT;
media_ptr -> fx_media_driver_status = FX_IO_ERROR;
/* If trace is enabled, insert this event into the trace buffer. */
FX_TRACE_IN_LINE_INSERT(FX_TRACE_INTERNAL_IO_DRIVER_UNINIT, media_ptr, 0, 0, 0, FX_TRACE_INTERNAL_EVENTS, 0, 0)
/* Call the specified I/O driver with the uninitialize request. */
(media_ptr -> fx_media_driver_entry) (media_ptr);
/* Return success! */
return(media_ptr -> fx_media_driver_status);
}