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125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
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/*
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File: VMCalls.h
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Contains: external calls for VM (called via MemoryDispatch)
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Written by: Phil Goldman, Rick Daley, Darin Adler, Joe Buczek
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Copyright: © 1989 by Apple Computer, Inc., all rights reserved.
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Change History:
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<SM1> 5/2/92 kc Roll in Horror. Comments follow:
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7/28/89 jb add DebugUtil trap
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7/24/89 jb add debugger support functions
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5/3/89 dba get rid of SystemMemoryInfo
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4/7/89 dba change name of registerA0 parameter
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4/4/89 jb add deferred user functions
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3/30/89 dba add error codes
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3/24/89 dba get rid of bits field
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3/24/89 dba new today
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To Do:
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*/
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#include <Types.h>
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typedef short PageState;
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typedef short StatusRegisterContents;
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/* values for PageState */
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#define kPageInMemory 0
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#define kPageOnDisk 1
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#define kNotPaged 2
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/* trap number of MemoryDispatch */
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#define _MemoryDispatch 0xA05C
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/* trap number of DeferUserFn */
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#define _DeferUserFn 0xA08F
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/* trap number of DebugUtil */
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#define _DebugUtil 0xA08D
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/* error codes */
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#define notEnoughMemoryErr (-620) /* insufficient physical memory */
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#define notHeldErr (-621) /* specified range of memory is not held */
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#define cannotMakeContiguousErr (-622) /* cannot make specified range contiguous */
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#define notLockedErr (-623) /* specified range of memory is not locked */
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#define interruptsMaskedErr (-624) /* don’t call with interrupts masked */
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#define cannotDeferErr (-625) /* unable to defer additional user functions */
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/* data structures for VM calls */
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struct MemoryBlock
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{
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void* address; /* start of block */
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unsigned long count; /* size of block */
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};
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#ifndef __cplusplus
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typedef struct MemoryBlock MemoryBlock;
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#endif
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#define defaultPhysicalEntryCount 8 /* default number of physical blocks in table */
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struct LogicalToPhysicalTable
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{
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MemoryBlock logical; /* logical block */
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MemoryBlock physical[defaultPhysicalEntryCount]; /* equivalent physical blocks */
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};
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#ifndef __cplusplus
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typedef struct LogicalToPhysicalTable LogicalToPhysicalTable;
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#endif
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/* VM calls */
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pascal OSErr HoldMemory(void* address, unsigned long count);
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/* keep pages in memory */
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pascal OSErr UnholdMemory(void* address, unsigned long count);
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/* allow pages to swap to backing store */
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pascal OSErr LockMemory(void* address, unsigned long count);
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/* lock pages to physical memory */
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pascal OSErr LockMemoryContiguous(void* address, unsigned long count);
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/* lock pages to contiguous physical memory */
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pascal OSErr UnlockMemory(void* address, unsigned long count);
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/* allow pages to re-map to physical memory */
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pascal OSErr GetPhysical(LogicalToPhysicalTable* addresses, unsigned long* physicalEntryCount);
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/* map a logical block to physical blocks */
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pascal OSErr DeferUserFn(ProcPtr, void* argument);
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/* delay execution of a procedure until page faulting is safe */
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/* debugger support functions */
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pascal long DebuggerGetMax(void);
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/* return the highest function number supported */
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pascal void DebuggerEnter(void);
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/* enter the debugging state */
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pascal void DebuggerExit(void);
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/* exit the debugging state */
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pascal long DebuggerPoll(void);
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/* keyboard polling without interrupts */
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pascal PageState GetPageState(void* address);
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/* return the state of the page containing the address */
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pascal Boolean PageFaultFatal(void);
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/* determine if a page fault would currently be fatal */
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pascal OSErr DebuggerLockMemory(void* address, unsigned long count);
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/* lock memory but do not disable cacheing of data */
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pascal OSErr DebuggerUnlockMemory(void* address, unsigned long count);
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/* undo the effects of DebuggerLockMemory */
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pascal StatusRegisterContents EnterSupervisorMode(void);
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/* explicitly enter supervisor mode */
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