From: Mark Johnston <ma...@freebsd.org> Currently we use a single bit to indicate whether the virtual page is part of a superpage. To support a forthcoming implementation of non-transparent 1GB superpages, it is useful to provide more detailed information about large page sizes.
The change converts MINCORE_SUPER into a mask for MINCORE_PSIND(psind) values, indicating a mapping of size psind, where psind is an index into the pagesizes array returned by getpagesizes(3), which in turn comes from the hw.pagesizes sysctl. MINCORE_PSIND(1) is equal to the old value of MINCORE_SUPER. For now, two bits are used to record the page size, permitting values of MAXPAGESIZES up to 4. Reviewed by: alc, kib Sponsored by: Juniper Networks, Inc. Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D26238 --- newlib/libc/sys/rtems/include/sys/mman.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/newlib/libc/sys/rtems/include/sys/mman.h b/newlib/libc/sys/rtems/include/sys/mman.h index 99c1eb8b3..6d861422d 100644 --- a/newlib/libc/sys/rtems/include/sys/mman.h +++ b/newlib/libc/sys/rtems/include/sys/mman.h @@ -179,7 +179,8 @@ #define MINCORE_MODIFIED 0x4 /* Page has been modified by us */ #define MINCORE_REFERENCED_OTHER 0x8 /* Page has been referenced */ #define MINCORE_MODIFIED_OTHER 0x10 /* Page has been modified */ -#define MINCORE_SUPER 0x20 /* Page is a "super" page */ +#define MINCORE_SUPER 0x60 /* Page is a "super" page */ +#define MINCORE_PSIND(i) (((i) << 5) & MINCORE_SUPER) /* Page size */ /* * Anonymous object constant for shm_open(). -- 2.35.3 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
