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-rw-r--r--sdk-modifications/include/fs_cache.h118
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diff --git a/sdk-modifications/include/fs_cache.h b/sdk-modifications/include/fs_cache.h
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-/*
- cache.h
- The cache is not visible to the user. It should be flushed
- when any file is closed or changes are made to the filesystem.
-
- This cache implements a least-used-page replacement policy. This will
- distribute sectors evenly over the pages, so if less than the maximum
- pages are used at once, they should all eventually remain in the cache.
- This also has the benefit of throwing out old sectors, so as not to keep
- too many stale pages around.
-
- Copyright (c) 2006 Michael "Chishm" Chisholm
-
- Redistribution and use in source and binary forms, with or without modification,
- are permitted provided that the following conditions are met:
-
- 1. Redistributions of source code must retain the above copyright notice,
- this list of conditions and the following disclaimer.
- 2. Redistributions in binary form must reproduce the above copyright notice,
- this list of conditions and the following disclaimer in the documentation and/or
- other materials provided with the distribution.
- 3. The name of the author may not be used to endorse or promote products derived
- from this software without specific prior written permission.
-
- THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
- WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
- AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
- LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
- LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
- EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
- 2006-07-11 - Chishm
- * Original release
-*/
-
-#ifndef _CACHE_H
-#define _CACHE_H
-
-#include "fs_common.h"
-#include "disc_io/disc_io.h"
-
-#define CACHE_PAGE_SIZE BYTES_PER_READ
-
-typedef struct {
- u32 sector;
- u32 count;
- bool dirty;
-} CACHE_ENTRY;
-
-typedef struct {
- const IO_INTERFACE* disc;
- u32 numberOfPages;
- CACHE_ENTRY* cacheEntries;
- u8* pages;
-} CACHE;
-
-
-/*
-Read data from a sector in the cache
-If the sector is not in the cache, it will be swapped in
-offset is the position to start reading from
-size is the amount of data to read
-Precondition: offset + size <= BYTES_PER_READ
-*/
-bool _FAT_cache_readPartialSector (CACHE* cache, void* buffer, u32 sector, u32 offset, u32 size);
-
-/*
-Write data to a sector in the cache
-If the sector is not in the cache, it will be swapped in.
-When the sector is swapped out, the data will be written to the disc
-offset is the position to start reading from
-size is the amount of data to read
-Precondition: offset + size <= BYTES_PER_READ
-*/
-bool _FAT_cache_writePartialSector (CACHE* cache, const void* buffer, u32 sector, u32 offset, u32 size);
-
-/*
-Write data to a sector in the cache, zeroing the sector first
-If the sector is not in the cache, it will be swapped in.
-When the sector is swapped out, the data will be written to the disc
-offset is the position to start reading from
-size is the amount of data to read
-Precondition: offset + size <= BYTES_PER_READ
-*/
-bool _FAT_cache_eraseWritePartialSector (CACHE* cache, const void* buffer, u32 sector, u32 offset, u32 size);
-
-/*
-Read a full sector from the cache
-*/
-static inline bool _FAT_cache_readSector (CACHE* cache, void* buffer, u32 sector) {
- return _FAT_cache_readPartialSector (cache, buffer, sector, 0, BYTES_PER_READ);
-}
-
-/*
-Write a full sector to the cache
-*/
-static inline bool _FAT_cache_writeSector (CACHE* cache, const void* buffer, u32 sector) {
- return _FAT_cache_writePartialSector (cache, buffer, sector, 0, BYTES_PER_READ);
-}
-
-/*
-Write any dirty sectors back to disc and clear out the contents of the cache
-*/
-bool _FAT_cache_flush (CACHE* cache);
-
-/*
-Clear out the contents of the cache without writing any dirty sectors first
-*/
-void _FAT_cache_invalidate (CACHE* cache);
-
-CACHE* _FAT_cache_constructor (u32 numberOfPages, const IO_INTERFACE* discInterface);
-
-void _FAT_cache_destructor (CACHE* cache);
-
-#endif // _CACHE_H