I386_GET_MTRR(2) | NetBSD System Calls Manual (i386) | I386_GET_MTRR(2) |
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.
November 10, 2001 | NetBSD 5.99 |