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MEMCONTROL(8)		  BSD System Manager's Manual		 MEMCONTROL(8)

     memcontrol	-- control system cache	behaviour with respect to memory

     memcontrol	list [-a]
     memcontrol	set -b base -l length -o owner attribute
     memcontrol	clear -o owner
     memcontrol	clear -b base -l length

     A number of supported system architectures	allow the behaviour of the CPU
     cache to be programmed to behave differently depending on the region be-
     ing written.

     The memcontrol utility provides an	interface to this facility, allowing
     CPU cache behavior	to be altered for ranges of system physical memory.

     These ranges are typically	power-of-2 aligned and sized, however the spe-
     cific rules governing their layout	vary between architectures.  The
     memcontrol	utility	does not attempt to enforce these rules, however the
     system will reject	any attempt to set an illegal combination.

     list   List range slots.

	    -a	    List all range slots, even those that are inactive.

     set    Set	memory range attributes.

	    -b base
		    Memory range base address.

	    -l length
		    Length of memory range in bytes, power of 2.

	    -o owner
		    Text identifier for	this setting (7	char max).

		    Attributes applied to this range; combinations of force,
		    uncacheable, write-combine,	write-through, write-back, and

     clear  Clear memory range attributes.  Ranges may be cleared by owner or
	    by base/length combination.

	    To clear based on ownership:

	    -o owner
		    All	ranges with this owner will be cleared.

	    To clear based on the base/length combination:

	    -b base
		    Memory range base address.

	    -l length
		    Length of memory range in bytes, power of 2.

	    Base and length must exactly match an existing range.


BSD			      September	15, 2002			   BSD


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