| I386_GET_MTRR(2) | System Calls Manual (i386) | I386_GET_MTRR(2) | 
i386_get_mtrr, i386_set_mtrr
  —
#include <sys/types.h>
#include <machine/sysarch.h>
#include <machine/mtrr.h>
int
  
  i386_get_mtrr(struct
    mtrr *mtrrp, int
    *n);
int
  
  i386_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 i386_set_mtrr() the
    integer pointed to by n will be updated to reflect the
    actual number of MTRRs successfully set. For
    i386_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.
i386_get_mtrr() and
  i386_set_mtrr() functions appeared in
  NetBSD 1.6.
| November 10, 2001 | NetBSD 10.0 |