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69 lines
3.0 KiB
C
69 lines
3.0 KiB
C
/*
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File: Zone24.h
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Contains: Information needed by 24-bit heap management routines. Mode non-specific
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information is in Zone.h. 32-bit heap information is in Zone32.h.
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Written by: David Harrison
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Copyright: © 1989-1991 by Apple Computer, Inc., all rights reserved.
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Change History (most recent first):
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<0> x/xx/89 DFH New Today.
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*/
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/************************************************************************************
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* Structure definition for heap block header
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************************************************************************************/
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typedef struct HeapBlock
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{
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unsigned int tagBC24 : 4; /* tag field (reloc/nonreloc/free) */
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unsigned int SizeCor24 : 4; /* size correction */
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unsigned int blkSize24 : 24; /* physical block size */
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Handle handle24; /* handle24 depends on block type, as follows:
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* non-relocatable: address of zone
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* relocatable: offset from zone to master pointer
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* free: undefined
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*/
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long blkData24[0]; /* data starts here */
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} HeapBlock, *HeapBlockPtr;
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/************************************************************************************
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* Macros for basic block header field access.
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* NOTE: Header access could be made faster/small by special-casing combinations of the
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* fields in the first long word. I opted not to do this, though, so that the code in
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* MemoryMgr24Patches.c and MemoryMgr32Patches.c matched as closely as possible.
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************************************************************************************/
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/* Characteristics */
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#define SIZEOF_BLOCK_HEADER (8)
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#define MIN_PHYSICAL_SIZE (SIZEOF_BLOCK_HEADER + MIN_LOGICAL_SIZE)
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/* Field extraction and evaluation */
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#define TAGBYTE(heapBlockPtr) ((heapBlockPtr)->tagBC24)
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#define freeTagVal 0x0
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#define nRelTagVal 0x4
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#define relTagVal 0x8
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#define SIZE_CORR(heapBlockPtr) ((heapBlockPtr)->SizeCor24)
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#define BLOCK_SIZE(heapBlockPtr) ((heapBlockPtr)->blkSize24)
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#define BLOCK_HANDLE(heapBlockPtr) ((heapBlockPtr)->handle24)
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#define BLOCK_DATA(heapBlockPtr) ((heapBlockPtr)->blkData24)
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#define MP_TAGBYTE(heapBlockPtr,theZone) (*((Ptr)(BLOCK_HANDLE(heapBlockPtr))+(unsigned long)(theZone)))
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#define resourceMPTagFlag 0x20
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#define purgeableMPTagFlag 0x40
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#define lockedMPTagFlag 0x80
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/************************************************************************************
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* Compound macros for block header field access.
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************************************************************************************/
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#define CLEAR_BLOCK_ATTRS(heapBlockPtr) (*((char *) (heapBlockPtr)) = 0)
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#define IS_FREE_BLOCK(heapBlockPtr) (TAGBYTE(heapBlockPtr) == freeTagVal)
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#define IS_NOT_FREE_BLOCK(heapBlockPtr) (TAGBYTE(heapBlockPtr) != freeTagVal)
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#define IS_NRELOC_BLOCK(heapBlockPtr) (TAGBYTE(heapBlockPtr) == nRelTagVal)
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#define IS_RELOC_BLOCK(heapBlockPtr) (TAGBYTE(heapBlockPtr) == relTagVal)
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#define IS_LOCKED_RELOC_BLOCK(heapBlockPtr,zonePtr) ((MP_TAGBYTE(heapBlockPtr,zonePtr) & lockedMPTagFlag) != 0)
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