12-03-2006
It is ACPI multiprocessor PC with Intel Pentium D processor
will this help or do you need somemore details,
Thank you
Last edited by sbasetty; 12-03-2006 at 01:09 PM..
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LEARN ABOUT CENTOS
mtrr_add
MTRR_ADD(9) Hardware Interfaces MTRR_ADD(9)
NAME
mtrr_add - Add a memory type region
SYNOPSIS
int mtrr_add(unsigned long base, unsigned long size, unsigned int type, bool increment);
ARGUMENTS
base
Physical base address of region
size
Physical size of region
type
Type of MTRR desired
increment
If this is true do usage counting on the region
DESCRIPTION
Memory type region registers control the caching on newer Intel and non Intel processors. This function allows drivers to request an MTRR
is added. The details and hardware specifics of each processor's implementation are hidden from the caller, but nevertheless the caller
should expect to need to provide a power of two size on an equivalent power of two boundary.
If the region cannot be added either because all regions are in use or the CPU cannot support it a negative value is returned. On success
the register number for this entry is returned, but should be treated as a cookie only.
On a multiprocessor machine the changes are made to all processors. This is required on x86 by the Intel processors.
The available types are
MTRR_TYPE_UNCACHABLE - No caching
MTRR_TYPE_WRBACK - Write data back in bursts whenever
MTRR_TYPE_WRCOMB - Write data back soon but allow bursts
MTRR_TYPE_WRTHROUGH - Cache reads but not writes
BUGS
Needs a quiet flag for the cases where drivers do not mind failures and do not wish system log messages to be sent.
COPYRIGHT
Kernel Hackers Manual 3.10 June 2014 MTRR_ADD(9)