void FAT_SectorCache::FlushAll()
{
for(int i = 0; i < SECTORCACHE_MAXSIZE; i++)
{
FlushSector( &m_cacheLines[i] );
}
}
FAT_SectorCache::FAT_CacheLine* FAT_SectorCache::GetUnusedCacheLine()
{
FAT_CacheLine* cacheLine;
FAT_CacheLine* topCandidate = NULL;
UINT32 counter;
UINT32 minLRUCounter = 0x7FFFFFFF;
for(int i = 0; i < SECTORCACHE_MAXSIZE; i++)
{
cacheLine = &m_cacheLines[i];
if(!cacheLine->m_buffer)
{
return cacheLine;
}
counter = cacheLine->GetLRUCounter();
if(counter < minLRUCounter)
{
minLRUCounter = counter;
topCandidate = cacheLine;
}
}
FlushSector( topCandidate );
return topCandidate;
}
/////////////////////////////////////////////////////////
// Description:
// flush content in IOBuffer to real hardware storage
//
// Input:
//
//
// output:
//
//
// Remarks:
//
// Returns:
void FAT_SectorCache::FlushSector( UINT32 sectorIndex )
{
FAT_CacheLine* cacheLine = GetCacheLine( sectorIndex );
if(cacheLine)
{
FlushSector( cacheLine );
}
}
void FAT_SectorCache::Uninitialize()
{
FAT_CacheLine* cacheLine;
for(int i = 0; i < SECTORCACHE_MAXSIZE; i++)
{
cacheLine = &m_cacheLines[i];
if(cacheLine->m_buffer)
{
FlushSector( cacheLine );
private_free( cacheLine->m_buffer );
cacheLine->m_buffer = NULL;
}
}
}
u8* Miss(u16 paddr)
{
u8 n = _head;
if (_flags[n])
{
u16 spm = sp >> (CACHEBITS-1);
u16 a = _addrs[n];
if (a >= spm) // Don't flush old stack junk
FlushSector(a);
}
u8* dst = PageData(n);
memcpy(dst,Seek(paddr),CACHELINE); // LOAD
_addrs[n] = paddr;
_flags[n] = 1;
return dst;
}
