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/**************************************************************************/ |
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/* */ |
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/* Copyright (c) Microsoft Corporation. All rights reserved. */ |
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/* */ |
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/* This software is licensed under the Microsoft Software License */ |
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */ |
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */ |
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/* and in the root directory of this software. */ |
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/* */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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/** */ |
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/** FileX Component */ |
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/** */ |
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/** Media */ |
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/** */ |
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/**************************************************************************/ |
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/**************************************************************************/ |
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#define FX_SOURCE_CODE |
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/* Include necessary system files. */ |
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#include "fx_api.h" |
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#include "fx_media.h" |
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#include "fx_system.h" |
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FX_CALLER_CHECKING_EXTERNS |
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/**************************************************************************/ |
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/* */ |
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/* FUNCTION RELEASE */ |
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/* */ |
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/* _fxe_media_open PORTABLE C */ |
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/* 6.1 */ |
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/* AUTHOR */ |
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/* */ |
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/* William E. Lamie, Microsoft Corporation */ |
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/* */ |
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/* DESCRIPTION */ |
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/* */ |
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/* This function checks for errors in the media open call. */ |
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/* */ |
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/* INPUT */ |
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/* */ |
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/* media_ptr Media control block pointer */ |
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/* media_name Pointer to media name string */ |
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/* media_driver Media driver entry function */ |
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/* driver_info_ptr Optional information pointer */ |
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/* supplied to media driver */ |
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/* memory_ptr Pointer to memory used by the */ |
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/* FileX for this media. */ |
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/* memory_size Size of media memory - must */ |
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/* at least 512 bytes and */ |
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/* one sector size. */ |
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/* media_control_block_size Size of FX_MEDIA structure */ |
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/* */ |
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/* OUTPUT */ |
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/* */ |
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/* FX_PTR_ERROR One or more input parameters */ |
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/* are NULL */ |
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/* status Actual completion status */ |
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/* */ |
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/* CALLS */ |
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/* */ |
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/* tx_thread_identify Get current thread */ |
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/* tx_thread_preemption_change Disable/restore preemption */ |
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/* _fx_media_open Actual media open service */ |
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/* */ |
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/* CALLED BY */ |
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/* */ |
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/* Application Code */ |
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/* */ |
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/* RELEASE HISTORY */ |
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/* */ |
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/* DATE NAME DESCRIPTION */ |
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/* */ |
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/* 05-19-2020 William E. Lamie Initial Version 6.0 */ |
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/* 09-30-2020 William E. Lamie Modified comment(s), */ |
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/* resulting in version 6.1 */ |
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/* */ |
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/**************************************************************************/ |
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UINT _fxe_media_open(FX_MEDIA *media_ptr, CHAR *media_name, |
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VOID (*media_driver)(FX_MEDIA *), VOID *driver_info_ptr, |
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VOID *memory_ptr, ULONG memory_size, UINT media_control_block_size) |
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{ |
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UINT status; |
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ULONG temp; |
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FX_MEDIA *current_media; |
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ULONG open_count; |
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#ifndef FX_SINGLE_THREAD |
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TX_THREAD *current_thread; |
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UINT old_threshold; |
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#endif |
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/* Check for invalid input pointers. */ |
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✓✓✓✓
✓✓✓✓
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if ((media_ptr == FX_NULL) || (media_driver == FX_NULL) || (memory_ptr == FX_NULL) || (media_control_block_size != sizeof(FX_MEDIA))) |
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{ |
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return(FX_PTR_ERROR); |
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} |
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/* Check for a valid caller. */ |
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✓✓✓✓
✓✓ |
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FX_CALLER_CHECKING_CODE |
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/* Check for proper size of the logical sector cache. */ |
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temp = _fx_system_media_max_sector_cache; |
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/* Isolate the lowest set bit. */ |
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temp = (temp & ((~temp) + ((ULONG) 1))); |
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/* If FX_MAX_SECTOR_CACHE is a power of 2, the value of temp should be unchanged. */ |
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✓✓✓✓
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if ((temp == 1) || (temp != _fx_system_media_max_sector_cache)) |
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{ |
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/* Not a power of 2, return an error. */ |
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return(FX_MEDIA_INVALID); |
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} |
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/* Check for proper size of the FAT cache. */ |
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temp = _fx_system_media_max_fat_cache; |
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/* Isolate the lowest set bit. */ |
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temp = (temp & ((~temp) + ((ULONG) 1))); |
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/* If FX_MAX_FAT_CACHE is a power of 2, the value of temp should be unchanged. */ |
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✓✓✓✓
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if ((temp == 1) || (temp != _fx_system_media_max_fat_cache)) |
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{ |
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/* Not a power of 2, return an error. */ |
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return(FX_MEDIA_INVALID); |
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} |
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#ifndef FX_SINGLE_THREAD |
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/* Pickup current thread pointer. At this point we know the current thread pointer is non-null since |
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it was checked by code in FX_CALLER_CHECKING_CODE macro. */ |
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current_thread = tx_thread_identify(); |
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/* Disable preemption temporarily. */ |
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tx_thread_preemption_change(current_thread, 0, &old_threshold); |
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#endif |
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/* Loop to check for the media already opened. */ |
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current_media = _fx_system_media_opened_ptr; |
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open_count = _fx_system_media_opened_count; |
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✓✓ |
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while (open_count--) |
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{ |
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/* Is the new media pointer already open? */ |
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✓✓ |
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if (media_ptr == current_media) |
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{ |
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#ifndef FX_SINGLE_THREAD |
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/* Restore preemption. */ |
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tx_thread_preemption_change(current_thread, old_threshold, &old_threshold); |
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#endif |
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/* Duplicate media open, return an error! */ |
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return(FX_PTR_ERROR); |
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} |
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/* Move to next entry. */ |
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current_media = current_media -> fx_media_opened_next; |
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} |
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#ifndef FX_SINGLE_THREAD |
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/* Restore preemption. */ |
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tx_thread_preemption_change(current_thread, old_threshold, &old_threshold); |
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#endif |
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/* Call actual media open service. */ |
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status = _fx_media_open(media_ptr, media_name, media_driver, driver_info_ptr, |
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memory_ptr, memory_size); |
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/* Return status. */ |
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return(status); |
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} |
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