--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/kernel/eka/memmodel/epoc/flexible/mmu/mpdalloc.cpp Mon Oct 19 15:55:17 2009 +0100
@@ -0,0 +1,211 @@
+// Copyright (c) 2007-2009 Nokia Corporation and/or its subsidiary(-ies).
+// All rights reserved.
+// This component and the accompanying materials are made available
+// under the terms of the License "Eclipse Public License v1.0"
+// which accompanies this distribution, and is available
+// at the URL "http://www.eclipse.org/legal/epl-v10.html".
+//
+// Initial Contributors:
+// Nokia Corporation - initial contribution.
+//
+// Contributors:
+//
+// Description:
+//
+
+#include "memmodel.h"
+#include "mm.h"
+#include "mmu.h"
+
+#include "mpdalloc.h"
+#include "mobject.h"
+#include "cache_maintenance.inl"
+
+
+// check enough space for page directories...
+__ASSERT_COMPILE(KNumOsAsids <= (KPageDirectoryEnd-KPageDirectoryBase)/KPageDirectorySize);
+
+
+PageDirectoryAllocator PageDirectories;
+
+
+const TUint KLocalPdShift = KPageDirectoryShift > KPageShift ? KPageDirectoryShift-1 : KPageShift;
+const TUint KLocalPdSize = 1<<KLocalPdShift;
+const TUint KLocalPdPages = 1<<(KLocalPdShift-KPageShift);
+
+
+__ASSERT_COMPILE((KPageDirectoryBase&(31*KPageDirectorySize))==0); // following code assumes this alignment
+
+void PageDirectoryAllocator::GlobalPdeChanged(TPde* aPde)
+ {
+ __NK_ASSERT_DEBUG(MmuLock::IsHeld());
+ __NK_ASSERT_DEBUG(TLinAddr(aPde)>=KPageDirectoryBase);
+ __NK_ASSERT_DEBUG(TLinAddr(aPde)<KPageDirectoryEnd);
+ __NK_ASSERT_DEBUG(KLocalPdSize==(TUint)KPageDirectorySize); // shouldn't be called if we have separate global PDs
+
+ TLinAddr addr = (TLinAddr(aPde)&KPageDirectoryMask)*(KChunkSize/sizeof(TPde));
+ if(addr<KGlobalMemoryBase)
+ return; // change was in local part of PD, so nothing to do
+ if(addr-KIPCAlias<KIPCAliasAreaSize)
+ return; // change was in IPC alias area, so nothing to do
+ if(!iAllocator)
+ return; // not yet initialised
+
+ TRACE2(("PageDirectoryAllocator::GlobalPdeChanged(0x%08x)",aPde));
+ TPde pde = *aPde;
+ TLinAddr pPde = KPageDirectoryBase+(TLinAddr(aPde)&KPageDirectoryMask); // first page directory
+
+ // copy PDE to all allocated page directories
+ pPde -= KPageDirectorySize; // start off at PD minus one
+ TLinAddr lastPd = KPageDirectoryBase+(KNumOsAsids-1)*KPageDirectorySize;
+ TUint32* ptr = iAllocator->iMap;
+ do
+ {
+ TUint32 bits = ~*ptr++;
+ do
+ {
+ pPde += KPageDirectorySize; // step to next page directory
+ if(bits&0x80000000u)
+ {
+ TRACE2(("!PDE %x=%x",pPde,pde));
+ *(TPde*)pPde = pde;
+ CacheMaintenance::SinglePdeUpdated(pPde);
+ }
+ }
+ while(bits<<=1);
+ pPde |= 31*KPageDirectorySize; // step to next group of 32 PDs
+ }
+ while(pPde<lastPd);
+ }
+
+
+void PageDirectoryAllocator::Init2()
+ {
+ TRACEB(("PageDirectoryAllocator::Init2()"));
+
+ // construct memory object for page directories...
+#if defined(__CPU_PAGE_TABLES_FULLY_CACHED)
+ TMemoryAttributes memAttr = EMemoryAttributeStandard;
+#else
+ TMemoryAttributes memAttr = (TMemoryAttributes)(EMemoryAttributeNormalUncached|EMemoryAttributeDefaultShareable);
+#endif
+ TInt r = MM::InitFixedKernelMemory(iPageDirectoryMemory, KPageDirectoryBase, KPageDirectoryEnd, KPageDirectorySize, EMemoryObjectHardware, EMemoryCreateNoWipe, memAttr, EMappingCreateFixedVirtual);
+ __NK_ASSERT_ALWAYS(r==KErrNone);
+
+ // initialise kernel page directory...
+ TPhysAddr kernelPd = Mmu::LinearToPhysical((TLinAddr)Mmu::PageDirectory(KKernelOsAsid));
+ iKernelPageDirectory = kernelPd;
+ ((DMemModelProcess*)K::TheKernelProcess)->iPageDir = kernelPd;
+ AssignPages(KKernelOsAsid*(KPageDirectorySize>>KPageShift),KPageDirectorySize>>KPageShift,kernelPd);
+
+ // construct allocator...
+ iAllocator = TBitMapAllocator::New(KNumOsAsids,ETrue);
+ __NK_ASSERT_ALWAYS(iAllocator);
+ iAllocator->Alloc(KKernelOsAsid,1); // kernel page directory already allocated
+
+ TRACEB(("PageDirectoryAllocator::Init2 done"));
+ }
+
+
+void PageDirectoryAllocator::AssignPages(TUint aIndex, TUint aCount, TPhysAddr aPhysAddr)
+ {
+ __NK_ASSERT_DEBUG(aCount<=KMaxPageInfoUpdatesInOneGo);
+ MmuLock::Lock();
+ SPageInfo* pi = SPageInfo::FromPhysAddr(aPhysAddr);
+ SPageInfo* piEnd = pi+aCount;
+ while(pi<piEnd)
+ {
+ pi->SetPhysAlloc(iPageDirectoryMemory,aIndex);
+ ++pi;
+ ++aIndex;
+ }
+ MmuLock::Unlock();
+ }
+
+
+TInt PageDirectoryAllocator::Alloc(TUint aOsAsid, TPhysAddr& aPageDirectory)
+ {
+ TRACE(("PageDirectoryAllocator::Alloc(%d)",aOsAsid));
+
+ // get memory for local page directory...
+ Mmu& m = TheMmu;
+ TUint offset = aOsAsid*KPageDirectorySize;
+ TPhysAddr pdPhys;
+ RamAllocLock::Lock();
+ TInt r = m.AllocContiguousRam(pdPhys, KLocalPdPages, KLocalPdShift-KPageShift, iPageDirectoryMemory->RamAllocFlags());
+ if(r==KErrNone)
+ AssignPages(offset>>KPageShift,KLocalPdPages,pdPhys);
+ RamAllocLock::Unlock();
+
+ if(r==KErrNone)
+ {
+ TRACE(("PageDirectoryAllocator::Alloc pdPhys = 0x%08x",pdPhys));
+
+ // map local page directory...
+ r = MM::MemoryAddContiguous(iPageDirectoryMemory,MM::BytesToPages(offset),KLocalPdPages,pdPhys);
+ if(r!=KErrNone)
+ {
+ RamAllocLock::Lock();
+ m.FreeContiguousRam(pdPhys,KLocalPdPages);
+ RamAllocLock::Unlock();
+ }
+ else
+ {
+ aPageDirectory = pdPhys;
+
+ TPde* pd = Mmu::PageDirectory(aOsAsid);
+ const TUint globalOffset = (KGlobalMemoryBase>>KChunkShift)*sizeof(TPde); // start of global part
+
+ // clear local entries in page directory...
+ memclr(pd,globalOffset);
+ CacheMaintenance::PdesInitialised((TLinAddr)pd,globalOffset);
+
+ if(KLocalPdSize<(TUint)KPageDirectorySize)
+ {
+ // map global page directory after local part...
+ __NK_ASSERT_DEBUG(KLocalPdSize==globalOffset);
+ r = MM::MemoryAddContiguous(iPageDirectoryMemory, MM::BytesToPages(offset+KLocalPdSize),
+ (KPageDirectorySize-KLocalPdSize)/KPageSize, iKernelPageDirectory+KLocalPdSize);
+ __NK_ASSERT_DEBUG(r==KErrNone); // can't fail
+ MmuLock::Lock(); // need lock because allocator not otherwise atomic
+ iAllocator->Alloc(aOsAsid,1);
+ MmuLock::Unlock();
+ }
+ else
+ {
+ // copy global entries to local page directory...
+ TPde* globalPd = Mmu::PageDirectory(KKernelOsAsid);
+ MmuLock::Lock(); // need lock because allocator not otherwise atomic, also to make sure GlobalPdeChanged() only accesses extant PDs
+ memcpy((TUint8*)pd+globalOffset,(TUint8*)globalPd+globalOffset,KPageDirectorySize-globalOffset);
+ iAllocator->Alloc(aOsAsid,1);
+ MmuLock::Unlock();
+ CacheMaintenance::PdesInitialised((TLinAddr)((TUint8*)pd+globalOffset),KPageDirectorySize-globalOffset);
+ }
+ }
+ }
+ TRACE(("PageDirectoryAllocator::Alloc returns %d",r));
+ return r;
+ }
+
+
+void PageDirectoryAllocator::Free(TUint aOsAsid)
+ {
+ TRACE(("PageDirectoryAllocator::Free(%d)",aOsAsid));
+
+ MmuLock::Lock(); // need lock because allocator not otherwise atomic, also to make sure GlobalPdeChanged() only accesses extant PDs
+ iAllocator->Free(aOsAsid, 1);
+ MmuLock::Unlock();
+
+ const TUint KPageDirectoryPageCount = KPageDirectorySize>>KPageShift;
+ TPhysAddr pages[KPageDirectoryPageCount];
+ TUint n = MM::MemoryRemovePages(iPageDirectoryMemory,aOsAsid*KPageDirectoryPageCount,KPageDirectoryPageCount,pages);
+ (void)n;
+ __NK_ASSERT_DEBUG(n==KPageDirectoryPageCount);
+
+ RamAllocLock::Lock();
+ Mmu& m = TheMmu;
+ // Page directories are fixed.
+ m.FreeRam(pages, KLocalPdPages, EPageFixed);
+ RamAllocLock::Unlock();
+ }
+