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95 lines
4.7 KiB
C
95 lines
4.7 KiB
C
/*
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* FreeLoader
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* Copyright (C) 1998-2003 Brian Palmer <brianp@sginet.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#pragma once
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#define TAG_CACHE_DATA 'DcaC'
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#define TAG_CACHE_BLOCK 'BcaC'
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///////////////////////////////////////////////////////////////////////////////////////
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//
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// This structure describes a cached block element. The disk is divided up into
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// cache blocks. For disks which LBA is not supported each block is the size of
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// one track. This will force the cache manager to make track sized reads, and
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// therefore maximizes throughput. For disks which support LBA the block size
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// is 64k because they have no cylinder, head, or sector boundaries.
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//
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///////////////////////////////////////////////////////////////////////////////////////
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typedef struct
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{
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LIST_ENTRY ListEntry; // Doubly linked list synchronization member
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ULONG BlockNumber; // Track index for CHS, 64k block index for LBA
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BOOLEAN LockedInCache; // Indicates that this block is locked in cache memory
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ULONG AccessCount; // Access count for this block
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PVOID BlockData; // Pointer to block data
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} CACHE_BLOCK, *PCACHE_BLOCK;
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///////////////////////////////////////////////////////////////////////////////////////
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//
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// This structure describes a cached drive. It contains the BIOS drive number
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// and indicates whether or not LBA is supported. If LBA is not supported then
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// the drive's geometry is described here.
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//
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///////////////////////////////////////////////////////////////////////////////////////
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typedef struct
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{
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UCHAR DriveNumber;
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ULONG BytesPerSector;
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ULONG BlockSize; // Block size (in sectors)
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LIST_ENTRY CacheBlockHead; // Contains CACHE_BLOCK structures
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} CACHE_DRIVE, *PCACHE_DRIVE;
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///////////////////////////////////////////////////////////////////////////////////////
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//
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// Internal data
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//
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///////////////////////////////////////////////////////////////////////////////////////
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extern CACHE_DRIVE CacheManagerDrive;
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extern BOOLEAN CacheManagerInitialized;
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extern ULONG CacheBlockCount;
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extern SIZE_T CacheSizeLimit;
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extern SIZE_T CacheSizeCurrent;
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///////////////////////////////////////////////////////////////////////////////////////
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//
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// Internal functions
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//
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///////////////////////////////////////////////////////////////////////////////////////
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PCACHE_BLOCK CacheInternalGetBlockPointer(PCACHE_DRIVE CacheDrive, ULONG BlockNumber); // Returns a pointer to a CACHE_BLOCK structure given a block number
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PCACHE_BLOCK CacheInternalFindBlock(PCACHE_DRIVE CacheDrive, ULONG BlockNumber); // Searches the block list for a particular block
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PCACHE_BLOCK CacheInternalAddBlockToCache(PCACHE_DRIVE CacheDrive, ULONG BlockNumber); // Adds a block to the cache's block list
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BOOLEAN CacheInternalFreeBlock(PCACHE_DRIVE CacheDrive); // Removes a block from the cache's block list & frees the memory
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VOID CacheInternalCheckCacheSizeLimits(PCACHE_DRIVE CacheDrive); // Checks the cache size limits to see if we can add a new block, if not calls CacheInternalFreeBlock()
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VOID CacheInternalDumpBlockList(PCACHE_DRIVE CacheDrive); // Dumps the list of cached blocks to the debug output port
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VOID CacheInternalOptimizeBlockList(PCACHE_DRIVE CacheDrive, PCACHE_BLOCK CacheBlock); // Moves the specified block to the head of the list
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BOOLEAN CacheInitializeDrive(UCHAR DriveNumber);
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VOID CacheInvalidateCacheData(VOID);
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BOOLEAN CacheReadDiskSectors(UCHAR DiskNumber, ULONGLONG StartSector, ULONG SectorCount, PVOID Buffer);
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BOOLEAN CacheForceDiskSectorsIntoCache(UCHAR DiskNumber, ULONGLONG StartSector, ULONG SectorCount);
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BOOLEAN CacheReleaseMemory(ULONG MinimumAmountToRelease);
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