Legacy Document

Inside Macintosh: Memory /

Chapter 4 - Memory Management Utilities / Memory Management Utilities Reference

Routines / Manipulating the Processor Caches

FlushCodeCacheRange

You can use the FlushCodeCacheRange function to flush a portion of the instruction cache.

FUNCTION FlushCodeCacheRange (address: UNIV Ptr; count: LongInt): 
                              OSErr;

address

The starting address of the range to flush.

count

The size, in bytes, of the range to flush.

DESCRIPTION

The FlushCodeCacheRange function flushes the current contents of the instruction cache. FlushCodeCacheRange is an optimized version of FlushCodeCache and is intended for use on processors such as the MC68040 that support flushing only a portion of the instruction cache. On processors that do not have this capability, FlushCodeCacheRange simply flushes the entire instruction cache.

The FlushCodeCacheRange function might flush a larger portion of the instruction cache than requested if it would be inefficient to satisfy the request exactly.

ASSEMBLY-LANGUAGE INFORMATION

The trap macro and routine selector for FlushCodeCacheRange are

Trap macro	Selector
_HWPriv	$0009

The registers on entry and exit for FlushCodeCacheRange are

Registers on entry
A0	Starting address of the range to flush
A1	Number of bytes to flush
D0	Routine selector

Registers on exit
D0	Result code

RESULT CODES

noErr	0	No error
hwParamErr	-502	Processor does not support flushing a range