Copyright (c) 2001 The NetBSD Foundation, Inc.
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This code is derived from software contributed to The NetBSD Foundation
by Gregory McGarry.
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.Dd November 10, 2001 .Dt I386_GET_MTRR 3 i386 .Os .Sh NAME .Nm i386_get_mtrr , .Nm i386_set_mtrr .Nd access MTRR registers .Sh LIBRARY .Lb libi386 .Sh SYNOPSIS .Fd #include <sys/types.h> .Fd #include <machine/sysarch.h> .Fd #include <machine/mtrr.h> .Ft int .Fn i386_get_mtrr "struct mtrr *mtrrp" "int *n" .Ft int .Fn i386_set_mtrr "struct mtrr *mtrrp" "int *n" .Sh DESCRIPTION These functions provide an interface to the MTRR registers found on 686-class processors.
p The argument .Fa mtrrp has the following structure: d -literal struct mtrr { uint64_t base; uint64_t len; uint8_t type; int flags; pid_t owner; }; .Ed
p The location of the mapping is described by its base address .Em base and length .Em len . Valid values for .Em type are:
p l -tag -offset indent -width MTRR_TYPE_UNDEF1 -compact t MTRR_TYPE_UC t MTRR_TYPE_WC t MTRR_TYPE_UNDEF1 t MTRR_TYPE_UNDEF2 t MTRR_TYPE_WT t MTRR_TYPE_WP t MTRR_TYPE_WB .El
p Valid values for .Em flags are:
p l -tag -offset indent -width MTRR_PRIVATE -compact t MTRR_PRIVATE own range, reset at exit t MTRR_FIXED use fixed range MTRR t MTRR_VALID entry is valid .El
p The .Em owner member the PID of the user process which claims the mapping. It is only valid if MTRR_PRIVATE is set in .Em flags . .Sh RETURN VALUES Upon successful completion zero is returned, otherwise -1 is returned on failure.
Indexes created Sat Oct 25 16:10:12 GMT 2025