iBoot源代码，来自Github

/* * Copyright (c) 2008-2009 Apple Inc. All rights reserved. * * This document is the property of Apple Inc. * It is considered confidential and proprietary. * * This document may not be reproduced or transmitted in any form, * in whole or in part, without the express written permission of * Apple Inc. */ #define TIME_TREE 0 #define AND_TRACE_LAYER FTL #include "yaFTL_whoami.h" #include "WMRConfig.h" #include "ANDTypes.h" #include "WMROAM.h" #include "WMRBuf.h" #include "VFLBuffer.h" #include "VFL.h" #include "yaFTLTypes.h" #include "FTL.h" #include "yaFTL_Defines.h" #include "yaFTL_gc.h" #include "yaFTL_BTOC.h" #include "L2V/L2V_Extern.h" #if TIME_TREE #include <kern/clock.h> #endif #include "WMRFeatures.h" #ifndef ENABLE_L2V_TREE #error ENABLE_L2V_TREE must be set to 0 or 1 in WMRFeatures.h #endif #define kYaftlMinorVersion (1) #if !NAND_RAW && !NAND_PPN #error PPN or raw? #endif #ifdef AND_COLLECT_STATISTICS FTLStatistics stFTLStatistics; #endif /* AND_COLLECT_STATISTICS */ #define CXT_VER "CX01" FTLWMRDeviceInfo yaFTL_FTLDeviceInfo; VFLFunctions yaFTL_VFLFunctions; yaFTL_t yaFTL; static BOOL32 yaftl_init_done = FALSE32; /* static functions declaration section */ static void YAFTL_FreeMemory(void); static Int32 YAFTL_Init(VFLFunctions *pVFLFunctions); static Int32 YAFTL_Open(UInt32 *pTotalScts, UInt32 * pdwSectorSize, BOOL32 nandFullRestore, BOOL32 justFormatted, UInt32 dwMinorVer, UInt32 dwOptions); static Int32 YAFTL_Read(UInt32 nLpn, UInt32 nNumOfScts, UInt8 *pBuf); static void YAFTL_Close(void); static BOOL32 YAFTL_GetStruct(UInt32 dwStructType, void * pvoidStructBuffer, UInt32 * pdwStructSize); Int32 _readPage(UInt32 vpn, UInt8 *pageData, PageMeta_t *pMeta, BOOL32 bInternalOp, BOOL32 boolCleanCheck, BOOL32 scrubOnUECC); BOOL32 _readMultiPages(UInt32 * padwVpn, UInt16 wNumPagesToRead, UInt8 * pbaData, UInt8 * pbaSpare, BOOL32 bInternalOp, BOOL32 scrubOnUECC); #if ENABLE_L2V_TREE static void PopulateFromIndexCache(UInt32 indexPageNo, UInt32 *indexPageData); #endif //ENABLE_L2V_TREE static void PopulateTreesOnBoot_Fast(void); #ifndef AND_READONLY static Int32 YAFTL_Write(UInt32 nLpn, UInt32 nNumOfScts, UInt8 *pBuf, BOOL32 isStatic); static Int32 YAFTL_Format(UInt32 dwOptions); static Int32 YAFTL_WearLevel(void); static BOOL32 YAFTL_GarbageCollect(void); static BOOL32 YAFTL_ShutdownNotify(BOOL32 boolMergeLogs); Int32 _writePage(UInt32 vpn, UInt8 *pageData, PageMeta_t *, BOOL32 bInternalOp); static ANDStatus writeIndexPage(UInt8 *pageBuffer, PageMeta_t *mdPtr, UInt8 flag); UInt32 _allocateBlock(UInt32 blockNo, UInt8 flag, UInt8 type); BOOL32 _writeMultiPages(UInt16 vbn, UInt16 pageOffset, UInt16 wNumPagesToWrite, UInt8 *pageData, PageMeta_t *mdPtr, BOOL32 bInternalOp); UInt32* IndexLoadDirty(UInt32 lba, UInt32 *indexOfs); UInt32* IndexLoadClean(UInt32 lba, UInt32 *indexOfs, UInt32 *d_tocEntry); void IndexMarkDirty(UInt32 tocEntry); ANDStatus invalidateCXT(void); BOOL32 isBlockInEraseNowList(UInt16 blockNo); BOOL32 removeBlockFromEraseNowList(UInt16 blockNo); BOOL32 addBlockToEraseNowList(UInt16 blockNo); #endif // ! AND_READONLY /* static variables/structures declaration section */ typedef struct blockList { WeaveSeq_t weaveSeq; UInt16 blockNo; struct blockList *next; struct blockList *prev; } BlockListType; typedef struct BlockRange { UInt32 start; UInt32 end; } BlockRangeType; #if NAND_PPN typedef struct YAFTLControlInfo { UInt32 versionNo; UInt32 indexSize; /* index size in blocks */ UInt32 logicalPartitionSize; /* partititon size in pages exposed to file system */ UInt32 wrState_data_block; /* current physical block being used for updates */ UInt32 wrState_data_weaveSeq_Lo; UInt32 wrState_data_weaveSeq_Hi; UInt32 wrState_index_block; /* current physical block being used for updates */ UInt32 wrState_index_weaveSeq_Lo; UInt32 wrState_index_weaveSeq_Hi; UInt32 seaState_data_freeBlocks; /* number of free ( erased ) blocks */ UInt32 seaState_index_freeBlocks; /* number of free ( erased ) blocks */ UInt32 seaState_data_allocdBlocks; UInt32 seaState_index_allocdBlocks; UInt32 indexCacheSize; UInt32 FTLRestoreCnt; UInt32 reserved32[10]; UInt16 TOCtableEntriesNo; /* number of entries in index TOC table */ UInt16 controlPageNo; UInt16 indexPageRatio; /* TOC of each block contains Lpa for each page written to block */ UInt16 freeCachePages; UInt16 nextFreeCachePage; UInt16 wrState_data_nextPage; /* offset in current block of next free page */ UInt16 wrState_index_nextPage; /* offset in current block of next free page */ UInt32 reserved16[10]; UInt8 exportedRatio; UInt8 cxtEraseCounter; UInt8 reserved8[10]; } YAFTLControlInfoType; #elif NAND_RAW typedef struct YAFTLControlInfo { UInt32 versionNo; UInt32 indexSize; /* index size in blocks */ UInt32 logicalPartitionSize; /* partititon size in pages exposed to file system */ UInt32 wrState_data_block; /* current physical block being used for updates */ UInt32 wrState_data_weaveSeq; UInt32 wrState_index_block; /* current physical block being used for updates */ UInt32 wrState_index_weaveSeq; UInt32 seaState_data_freeBlocks; /* number of free ( erased ) blocks */ UInt32 seaState_index_freeBlocks; /* number of free ( erased ) blocks */ UInt32 seaState_data_allocdBlocks; UInt32 seaState_index_allocdBlocks; UInt32 indexCacheSize; UInt32 FTLRestoreCnt; UInt32 reserved32[10]; UInt16 TOCtableEntriesNo; /* number of entries in index TOC table */ UInt16 controlPageNo; UInt16 indexPageRatio; /* TOC of each block contains Lpa for each page written to block */ UInt16 freeCachePages; UInt16 nextFreeCachePage; UInt16 wrState_data_nextPage; /* offset in current block of next free page */ UInt16 wrState_index_nextPage; /* offset in current block of next free page */ UInt32 reserved16[10]; UInt8 exportedRatio; UInt8 cxtEraseCounter; UInt8 reserved8[10]; } YAFTLControlInfoType; #else #error PPN or raw? #endif static BOOL32 _allocateRestoreIndexBuffers(BlockRangeType **blockRangeBuffer, UInt32 **indexTable, UInt32 *indexTableSize); #ifdef AND_COLLECT_STATISTICS #ifndef AND_READONLY static BOOL32 _FTLGetStatisticsToCxt(UInt8 * pabData); #endif //ifndef AND_READONLY static BOOL32 _FTLSetStatisticsFromCxt(UInt8 * pabData); #endif #ifndef AND_READONLY static BOOL32 YAFTL_WriteStats(void); #define CXT_ERASE_GAP 50 #define MOVE_CXT_TRESHOLD 1000 #define ERASE_CXT_UPDATE_THRESHOLD (FTL_AREA_SIZE>>4) #define WRITE_CXT_UPDATE_THRESHOLD (USER_PAGES_TOTAL>>4) #endif static UInt32 tempIndexBufferSize = 0; /*****************************************************************************/ /* Code Implementation */ /*****************************************************************************/ void freeBlockList(BlockListType * listHead) { BlockListType * tmpPtr = listHead; while(tmpPtr != NULL) { listHea