PGMPhys.h revision 7526d3857510b172b515894357c9c6cb7e7d9704
/* $Id$ */
/** @file
* PGM - Page Manager and Monitor, Physical Memory Access Template.
*/
/*
* Copyright (C) 2006-2007 Sun Microsystems, Inc.
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 USA or visit http://www.sun.com if you need
* additional information or have any questions.
*/
/**
* Read physical memory. (one byte/word/dword)
*
* This API respects access handlers and MMIO. Use PGMPhysReadGCPhys() if you
* want to ignore those.
*
* @param pVM VM Handle.
* @param GCPhys Physical address start reading from.
*/
PGMDECL(PGMPHYS_DATATYPE) PGMPHYSFN_READNAME(PVM pVM, RTGCPHYS GCPhys)
{
uint32_t iCacheIndex;
Assert(VM_IS_EMT(pVM));
#ifdef PGM_PHYSMEMACCESS_CACHING
if (pVM->pgm.s.fPhysCacheFlushPending)
{
pVM->pgm.s.pgmphysreadcache.aEntries = 0; /* flush cache; physical or virtual handlers have changed */
pVM->pgm.s.pgmphyswritecache.aEntries = 0; /* flush cache; physical or virtual handlers have changed */
pVM->pgm.s.fPhysCacheFlushPending = false;
}
else
if ( ASMBitTest(&pVM->pgm.s.pgmphysreadcache.aEntries, (iCacheIndex = ((GCPhys >> PAGE_SHIFT) & PGM_MAX_PHYSCACHE_ENTRIES_MASK)))
&& pVM->pgm.s.pgmphysreadcache.Entry[iCacheIndex].GCPhys == PHYS_PAGE_ADDRESS(GCPhys)
#if PGMPHYS_DATASIZE != 1
&& PHYS_PAGE_ADDRESS(GCPhys) == PHYS_PAGE_ADDRESS(GCPhys + sizeof(PGMPHYS_DATATYPE) - 1) /** (GCPhys & PAGE_OFFSET_MASK) <= PAGE_SIZE - sizeof(PGMPHYS_DATATYPE) */
#endif
)
{
RTGCPHYS off = GCPhys - pVM->pgm.s.pgmphysreadcache.Entry[iCacheIndex].GCPhys;
return *(PGMPHYS_DATATYPE *)(pVM->pgm.s.pgmphysreadcache.Entry[iCacheIndex].pbHC + off);
}
#endif /* PGM_PHYSMEMACCESS_CACHING */
PGMPHYS_DATATYPE val;
PGMPhysRead(pVM, GCPhys, &val, sizeof(val));
return val;
}
/**
* Write to physical memory. (one byte/word/dword)
*
* This API respects access handlers and MMIO. Use PGMPhysReadGCPhys() if you
* want to ignore those.
*
* @param pVM VM Handle.
* @param GCPhys Physical address to write to.
* @param val What to write.
*/
PGMDECL(void) PGMPHYSFN_WRITENAME(PVM pVM, RTGCPHYS GCPhys, PGMPHYS_DATATYPE val)
{
uint32_t iCacheIndex;
Assert(VM_IS_EMT(pVM));
#ifdef PGM_PHYSMEMACCESS_CACHING
if (pVM->pgm.s.fPhysCacheFlushPending)
{
pVM->pgm.s.pgmphysreadcache.aEntries = 0; /* flush cache; physical or virtual handlers have changed */
pVM->pgm.s.pgmphyswritecache.aEntries = 0; /* flush cache; physical or virtual handlers have changed */
pVM->pgm.s.fPhysCacheFlushPending = false;
}
else
if ( ASMBitTest(&pVM->pgm.s.pgmphyswritecache.aEntries, (iCacheIndex = ((GCPhys >> PAGE_SHIFT) & PGM_MAX_PHYSCACHE_ENTRIES_MASK)))
&& pVM->pgm.s.pgmphyswritecache.Entry[iCacheIndex].GCPhys == PHYS_PAGE_ADDRESS(GCPhys)
#if PGMPHYS_DATASIZE != 1
&& PHYS_PAGE_ADDRESS(GCPhys) == PHYS_PAGE_ADDRESS(GCPhys + sizeof(val) - 1)
#endif
)
{
RTGCPHYS off = GCPhys - pVM->pgm.s.pgmphyswritecache.Entry[iCacheIndex].GCPhys;
*(PGMPHYS_DATATYPE *)(pVM->pgm.s.pgmphyswritecache.Entry[iCacheIndex].pbHC + off) = val;
return;
}
#endif /* PGM_PHYSMEMACCESS_CACHING */
return PGMPhysWrite(pVM, GCPhys, &val, sizeof(val));
}
#undef PGMPHYSFN_READNAME
#undef PGMPHYSFN_WRITENAME
#undef PGMPHYS_DATATYPE
#undef PGMPHYS_DATASIZE