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From: Sebastian Huber <>
Subject: [newlib-cygwin] Include the psind in data returned by mincore(2).
Date: Mon, 11 Jul 2022 11:52:24 +0000 (GMT)	[thread overview]
Message-ID: <> (raw);h=1a5f14a0c547c6c7ecddaeb5171a80ed28ab3316

commit 1a5f14a0c547c6c7ecddaeb5171a80ed28ab3316
Author: Mark Johnston <>
Date:   Wed Sep 2 18:16:43 2020 +0000

    Include the psind in data returned by mincore(2).
    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:

 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().

                 reply	other threads:[~2022-07-11 11:52 UTC|newest]

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