Chameleon

Chameleon Commit Details

Date:2010-08-01 02:36:56 (9 years 2 months ago)
Author:Tamás Kosárszky
Commit:292
Parents: 291
Message:Added cache support for FAT filesystems. Now booting from an average speed flash drive formatted to FAT32 fs using 512 byte cluster size is about 50 times faster.
Changes:
M/trunk/i386/libsaio/cache.c
M/trunk/i386/libsaio/msdos.c

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trunk/i386/libsaio/cache.c
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#define kCacheSize (0x100000)
#define kCacheMinBlockSize (0x200)
#define kCacheMaxBlockSize (0x4000)
#define kCacheMaxBlockSize (0x8000)
#define kCacheMaxEntries (kCacheSize / kCacheMinBlockSize)
static CICell gCacheIH;
#endif
if ((blockSize < kCacheMinBlockSize) ||
(blockSize >= kCacheMaxBlockSize))
(blockSize > kCacheMaxBlockSize))
return;
gCacheBlockSize = blockSize;
trunk/i386/libsaio/msdos.c
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#define LABEL_LENGTH11
#define MAX_DOS_BLOCKSIZE2048
#define MAX_CACHE_BLOCKSIZE 32768
#defineCLUST_FIRST2/* reserved cluster range */
#defineCLUST_RSRVD320x0ffffff8/* reserved cluster range */
static CICell msdoscurrent = 0;
static int msdosrootcluster = 0;
static int msdosfatbits = 0;
static int msdosCacheBlockSize = 0;
#if UNUSED
/*
if (msdoscurrent == ih)
{
CacheInit(ih, msdosclustersize);
CacheInit(ih, msdosCacheBlockSize);
return 0;
}
}
msdosclustersize = msdosbps * spc;
msdoscurrent = ih;
CacheInit(ih, msdosclustersize);
msdosCacheBlockSize = (msdosclustersize > MAX_CACHE_BLOCKSIZE) ? msdosclustersize : MAX_CACHE_BLOCKSIZE;
CacheInit(ih, msdosCacheBlockSize);
free (buf);
return 0;
}
static int
readSectorAligned(CICell ih, off_t readOffset, char *buf, int size)
{
long long sectorOffset = (uint64_t)readOffset / msdosCacheBlockSize * msdosCacheBlockSize;
long relOffset = readOffset % msdosCacheBlockSize;
char *cacheBuffer;
cacheBuffer = malloc(msdosCacheBlockSize);
CacheRead(ih, cacheBuffer, sectorOffset, msdosCacheBlockSize, true);
bcopy(cacheBuffer + relOffset, buf, size);
free(cacheBuffer);
return 0;
}
static int
msdosreadcluster (CICell ih, uint8_t *buf, int size, off_t *cluster)
{
off_t readOffset;
/* Read in "cluster" */
if (buf)
{
Seek(ih, readOffset);
Read(ih, (long)buf, size);
readSectorAligned(ih, readOffset, (char *)buf, size);
}
/* Find first sector of FAT */
readOffset = msdosressector*msdosbps;
readOffset = msdosressector * msdosbps;
/* Find sector containing "cluster" entry in FAT */
readOffset += ((uint64_t)*cluster * (uint64_t)msdosfatbits)/8;
readOffset += ((uint64_t)*cluster * (uint64_t)msdosfatbits) / 8;
/* Read one sector of the FAT */
Seek(ih, readOffset);
Read(ih, (long)tmpbuf, 4);
readSectorAligned(ih, readOffset, tmpbuf, 4);
switch (msdosfatbits) {
case 32:

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Revision: 292