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-.Dd September 21, 2006
-.Dt CACHE 3
-.Os Darwin
-.Sh NAME
-.Nm sys_cache_control ,
-.Nm sys_icache_invalidate ,
-.Nm sys_dcache_flush
-.Nd cache control
-.Sh LIBRARY
-.Lb libc
-.Sh SYNOPSIS
-.In libkern/OSCacheControl.h
-.Ft int
-.Fn sys_cache_control "int function" "void *start" "size_t len"
-.Ft void
-.Fn sys_icache_invalidate "void *start" "size_t len"
-.Ft void
-.Fn sys_dcache_flush "void *start" "size_t len"
-.Sh DESCRIPTION
-.Pp
-These functions operate on every cache line containing one of the 
-.Fa len
-bytes of memory pointed to by
-.Fa start .
-Normally the operations apply to every
-processor in the system, but the exact semantics of these
-operations is platform dependent.  They should be used with caution.
-.Pp
-.Fn sys_cache_control
-performs the operation specified by
-.Fa function .
-Refer to the header file for a list of currently supported functions.
-.Pp
-.Fn sys_icache_invalidate
-prepares memory for execution, typically by invalidating the instruction
-cache for the indicated range.  This should be called
-after writing machine instructions to memory, and before
-executing them.  On IA32 processors this function is a NOP, because
-their instruction caches are coherent.
-.Pp
-.Fn sys_dcache_flush
-writes modified data cache lines to main memory,
-and then invalidates all lines in the range being operated on.
-It can be useful when dealing with cache incoherent
-devices or DMA.
-.Sh RETURN VALUES
-.Fn sys_cache_control
-returns zero on success, ENOTSUP if
-.Fa function
-is not valid.
-.Sh SEE ALSO
-.Xr atomic 3 ,
-.Xr barrier 3
-.Sh HISTORY
-These functions first appeared in Mac OS 10.5 (Leopard).