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https://github.com/wiidev/usbloadergx.git
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f6c9003574
*modified libcustomfat and ntfs fragment fetch function to support >512 bytes per sector *Added new ehcmodule (thanks rodries) *Added real support of using both ports simultaniously without shutting down the other (thanks rodries for the ehcmodule works on this). There is no longer the limitation that the settings have to be on SD card for this. (ONLY HERMES CIOS) *Moved a few settings to Feature Settings and added a new Hard Drive Settings *Changed Wiinnertag path to only point to the path and not to the file. You must correct the path manually in custom path settings or reset you configs for this change or Winnertag won't work!! *Removed a few compile warnings for devkitPPC R23
129 lines
4.8 KiB
C
129 lines
4.8 KiB
C
/*
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cache.h
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The cache is not visible to the user. It should be flushed
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when any file is closed or changes are made to the filesystem.
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This cache implements a least-used-page replacement policy. This will
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distribute sectors evenly over the pages, so if less than the maximum
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pages are used at once, they should all eventually remain in the cache.
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This also has the benefit of throwing out old sectors, so as not to keep
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too many stale pages around.
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Copyright (c) 2006 Michael "Chishm" Chisholm
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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1. Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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2. Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the documentation and/or
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other materials provided with the distribution.
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3. The name of the author may not be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
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WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _CACHE_H
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#define _CACHE_H
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#include "common.h"
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#include "disc.h"
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typedef struct {
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sec_t sector;
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unsigned int count;
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unsigned int last_access;
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bool dirty;
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uint8_t* cache;
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} CACHE_ENTRY;
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typedef struct {
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const DISC_INTERFACE* disc;
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sec_t endOfPartition;
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unsigned int numberOfPages;
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unsigned int sectorsPerPage;
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unsigned int bytesPerSector;
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CACHE_ENTRY* cacheEntries;
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} CACHE;
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/*
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Read data from a sector in the cache
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If the sector is not in the cache, it will be swapped in
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offset is the position to start reading from
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size is the amount of data to read
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Precondition: offset + size <= BYTES_PER_READ
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*/
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bool _FAT_cache_readPartialSector (CACHE* cache, void* buffer, sec_t sector, unsigned int offset, size_t size);
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bool _FAT_cache_readLittleEndianValue (CACHE* cache, uint32_t *value, sec_t sector, unsigned int offset, int num_bytes);
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/*
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Write data to a sector in the cache
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If the sector is not in the cache, it will be swapped in.
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When the sector is swapped out, the data will be written to the disc
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offset is the position to start writing to
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size is the amount of data to write
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Precondition: offset + size <= BYTES_PER_READ
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*/
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bool _FAT_cache_writePartialSector (CACHE* cache, const void* buffer, sec_t sector, unsigned int offset, size_t size);
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bool _FAT_cache_writeLittleEndianValue (CACHE* cache, const uint32_t value, sec_t sector, unsigned int offset, int num_bytes);
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/*
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Write data to a sector in the cache, zeroing the sector first
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If the sector is not in the cache, it will be swapped in.
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When the sector is swapped out, the data will be written to the disc
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offset is the position to start writing to
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size is the amount of data to write
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Precondition: offset + size <= BYTES_PER_READ
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*/
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bool _FAT_cache_eraseWritePartialSector (CACHE* cache, const void* buffer, sec_t sector, unsigned int offset, size_t size);
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/*
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Read several sectors from the cache
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*/
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bool _FAT_cache_readSectors (CACHE* cache, sec_t sector, sec_t numSectors, void* buffer);
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/*
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Read a full sector from the cache
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*/
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static inline bool _FAT_cache_readSector (CACHE* cache, void* buffer, sec_t sector) {
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return _FAT_cache_readPartialSector (cache, buffer, sector, 0, cache->bytesPerSector);
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}
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/*
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Write a full sector to the cache
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*/
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static inline bool _FAT_cache_writeSector (CACHE* cache, const void* buffer, sec_t sector) {
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return _FAT_cache_writePartialSector (cache, buffer, sector, 0, cache->bytesPerSector);
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}
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bool _FAT_cache_writeSectors (CACHE* cache, sec_t sector, sec_t numSectors, const void* buffer);
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/*
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Write any dirty sectors back to disc and clear out the contents of the cache
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*/
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bool _FAT_cache_flush (CACHE* cache);
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/*
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Clear out the contents of the cache without writing any dirty sectors first
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*/
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void _FAT_cache_invalidate (CACHE* cache);
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CACHE* _FAT_cache_constructor (unsigned int numberOfPages, unsigned int sectorsPerPage, const DISC_INTERFACE* discInterface, sec_t endOfPartition, unsigned int bytesPerSector);
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void _FAT_cache_destructor (CACHE* cache);
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#endif // _CACHE_H
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