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71 lines
3.0 KiB
C
71 lines
3.0 KiB
C
/*
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File: Zone32.h
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Contains: Information needed by 32-bit heap management routines. Mode non-specific
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information is in Zone.h. 24-bit heap information is in Zone24.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 char tagBC32; /* tag field (reloc/nonreloc/free) */
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unsigned char MPtag32; /* master pointer tags (lock/purge/resource) */
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unsigned char unused32; /* unused */
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char SizeCor32; /* size correction */
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unsigned long blkSize32; /* physical block size */
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Handle handle32; /* handle32 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: reserved, always 0
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*/
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long blkData32[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 (12)
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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)->tagBC32)
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#define freeTagVal 0x00
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#define nRelTagVal 0x40
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#define relTagVal 0x80
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#define SIZE_CORR(heapBlockPtr) ((heapBlockPtr)->SizeCor32)
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#define BLOCK_SIZE(heapBlockPtr) ((heapBlockPtr)->blkSize32)
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#define BLOCK_HANDLE(heapBlockPtr) ((heapBlockPtr)->handle32)
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#define BLOCK_DATA(heapBlockPtr) ((heapBlockPtr)->blkData32)
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#define MP_TAGBYTE(heapBlockPtr) ((heapBlockPtr)->MPtag32)
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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) (*((long *) (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) & lockedMPTagFlag) != 0)
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