X86_64_GET_MTRR(2) | System Calls Manual (x86_64) | X86_64_GET_MTRR(2) |
x86_64_get_mtrr
, x86_64_set_mtrr
—
#include <sys/types.h>
#include <machine/sysarch.h>
#include <machine/mtrr.h>
int
x86_64_get_mtrr
(struct
mtrr *mtrrp, int
*n);
int
x86_64_set_mtrr
(struct
mtrr *mtrrp, int
*n);
mtrrp is a pointer to one or more mtrr
structures, as described below. The n argument is a
pointer to an integer containing the number of structures pointed to by
mtrrp. For x86_64_set_mtrr
()
the integer pointed to by n will be updated to reflect
the actual number of MTRRs successfully set. For
x86_64_get_mtrr
() no more than
n structures will be copied out, and the integer value
pointed to by n will be updated to reflect the actual
number of valid structures retrieved. A NULL
argument to mtrrp will result in just the number of
MTRRs available being returned in the integer pointed to by
n.
The argument mtrrp has the following structure:
struct mtrr { uint64_t base; uint64_t len; uint8_t type; int flags; pid_t owner; };
The location of the mapping is described by its physical base address base and length len. Valid values for type are:
Valid values for flags are:
The owner member is the PID of the user process which claims the mapping. It is only valid if MTRR_PRIVATE is set in flags. To clear/reset MTRRs, use a flags field without MTRR_VALID set.
x86_64_get_mtrr
() and
x86_64_set_mtrr
() were derived from their i386
counterparts, which appeared in NetBSD 1.6.
November 10, 2001 | NetBSD 9.2 |