kernel/eka/include/slab.h
author mikek
Fri, 02 Jul 2010 09:53:45 +0100
branchGCC_SURGE
changeset 190 0d42d469e749
parent 109 b3a1d9898418
permissions -rw-r--r--
1) Swapping to c++ instead of assembly implementations of several kernel APIs to avoid calling probably broken implementations of __EH_FRAME_?? macros 2) Commenting out otherwise unavoidable calls to __EH_FRAME_?? macros in uc_exe.cia. This is a temporary hack. Both changes to see if they get past an early kernel panic in the Syborg ROM from the current build: EH ERROR: no exception descriptor for address 0x801eb277 Thread efile.exe::Main Panic USER-EXEC 3
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// Copyright (c) 1994-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of the License "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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// kernel\eka\include\slab.h
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// 
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//
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#ifndef __KERNEL_MODE__
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class slab;
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class slabhdr;
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#define MAXSLABSIZE		56
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#define	PAGESHIFT		12
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#define PAGESIZE		(1<<PAGESHIFT)
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#define	SLABSHIFT		10
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#define	SLABSIZE		(1 << SLABSHIFT)
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#define CELLALIGN		8
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const unsigned slabfull  = 0;
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const TInt	slabsperpage = (int)(PAGESIZE/SLABSIZE);
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#define HIBIT(bits) (((unsigned)bits & 0xc) ? 2 + ((unsigned)bits>>3) : ((unsigned) bits>>1))
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#define LOWBIT(bits)	(((unsigned) bits&3) ? 1 - ((unsigned)bits&1) : 3 - (((unsigned)bits>>2)&1))
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#define ZEROBITS(header)	(((unsigned)header & 0x70000000) ? 0 : 1)
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class slabhdr
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{
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	public:
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		unsigned iHeader;
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		// made up of
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		// bits   |    31    | 30..28 | 27..18 | 17..12 |  11..8  |   7..0   |
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		//        +----------+--------+--------+--------+---------+----------+
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		// field  | floating |  zero  | used-4 |  size  | pagemap | free pos |
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		//
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		slab** iParent;		// reference to iParent's pointer to this slab in tree
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		slab* iChild1;		// 1st iChild in tree
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		slab* iChild2;		// 2nd iChild in tree
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};
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const TInt KMaxSlabPayload = SLABSIZE - sizeof(slabhdr);
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#define MAXUSEDM4BITS   0x0fc00000
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#define FLOATING_BIT    0x80000000
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inline unsigned HeaderFloating(unsigned h)
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{return (h&0x80000000);}
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const unsigned maxuse = (SLABSIZE - sizeof(slabhdr))>>2;
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const unsigned firstpos = sizeof(slabhdr)>>2;
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#ifdef _DEBUG
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#define CHECKTREE(x) DoCheckSlabTree(x,EFalse)
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#define CHECKSLAB(s,t,p) DoCheckSlab(s,t,p)
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#define CHECKSLABBFR(s,p) {TUint32 b[4]; BuildPartialSlabBitmap(b,s,p);}
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#else
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#define CHECKTREE(x) (void)0
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#define CHECKSLAB(s,t,p) (void)0
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#define CHECKSLABBFR(s,p) (void)0
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#endif
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class slabset
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{
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	public:
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		slab* iPartial;
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};
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class slab : public slabhdr
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{
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	public:
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		void Init(unsigned clz);
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		//static slab* SlabFor( void* p);
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		static slab* SlabFor(const void* p) ;
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		unsigned char iPayload[SLABSIZE-sizeof(slabhdr)];
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};
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class page
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{
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	public:
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		inline static page* PageFor(slab* s);
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		//slab iSlabs;
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		slab iSlabs[slabsperpage];
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};
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inline page* page::PageFor(slab* s)
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{
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	return reinterpret_cast<page*>((unsigned(s))&~(PAGESIZE-1));
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}
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#endif   // __KERNEL_MODE__