mac-rom/ProcessMgr/Zone24.h

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