summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/sh/bits/shm.h
diff options
context:
space:
mode:
authorPaul Mundt <lethal@linux-sh.org>2006-08-25 04:54:39 +0000
committerPaul Mundt <lethal@linux-sh.org>2006-08-25 04:54:39 +0000
commit22e48d07b568b367f2293bc305924863743de736 (patch)
tree78aa4b36505abc0983a8dcb64f4251dab1ae785c /libc/sysdeps/linux/sh/bits/shm.h
parentc595d54c6b7aec888ba7847b7caa18c8e968fb3d (diff)
Bump SHMLBA up to a sensible size for dcache alias avoidance to coincide with
the kernel's get_unmapped_area() behaviour. Ideally this should be more tightly packed based off of the L1 dcache shape, once we're able to handle it through the auxiliary vector.
Diffstat (limited to 'libc/sysdeps/linux/sh/bits/shm.h')
-rw-r--r--libc/sysdeps/linux/sh/bits/shm.h109
1 files changed, 109 insertions, 0 deletions
diff --git a/libc/sysdeps/linux/sh/bits/shm.h b/libc/sysdeps/linux/sh/bits/shm.h
new file mode 100644
index 000000000..ccf4b8943
--- /dev/null
+++ b/libc/sysdeps/linux/sh/bits/shm.h
@@ -0,0 +1,109 @@
+/* Copyright (C) 1995,1996,1997,2000,2002,2004 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, write to the Free
+ Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+ 02111-1307 USA. */
+
+#ifndef _SYS_SHM_H
+# error "Never include <bits/shm.h> directly; use <sys/shm.h> instead."
+#endif
+
+#include <bits/types.h>
+
+/* Permission flag for shmget. */
+#define SHM_R 0400 /* or S_IRUGO from <linux/stat.h> */
+#define SHM_W 0200 /* or S_IWUGO from <linux/stat.h> */
+
+/* Flags for `shmat'. */
+#define SHM_RDONLY 010000 /* attach read-only else read-write */
+#define SHM_RND 020000 /* round attach address to SHMLBA */
+#define SHM_REMAP 040000 /* take-over region on attach */
+
+/* Commands for `shmctl'. */
+#define SHM_LOCK 11 /* lock segment (root only) */
+#define SHM_UNLOCK 12 /* unlock segment (root only) */
+
+__BEGIN_DECLS
+
+/* Segment low boundary address multiple. */
+/*
+ * XXX: This is misleading, SH-4 and SH-3 7705 in 32kb mode have dcache
+ * aliases to contend with in the 4k page case. This is not an issue for
+ * the other parts. Leave this bumped up for sanity until this can be
+ * accurately defined by the L1D shape through the auxiliary vector.
+ */
+#define SHMLBA (__getpagesize() << 2)
+extern int __getpagesize (void) __THROW __attribute__ ((__const__));
+
+
+/* Type to count number of attaches. */
+typedef unsigned long int shmatt_t;
+
+/* Data structure describing a set of semaphores. */
+struct shmid_ds
+ {
+ struct ipc_perm shm_perm; /* operation permission struct */
+ size_t shm_segsz; /* size of segment in bytes */
+ __time_t shm_atime; /* time of last shmat() */
+ unsigned long int __unused1;
+ __time_t shm_dtime; /* time of last shmdt() */
+ unsigned long int __unused2;
+ __time_t shm_ctime; /* time of last change by shmctl() */
+ unsigned long int __unused3;
+ __pid_t shm_cpid; /* pid of creator */
+ __pid_t shm_lpid; /* pid of last shmop */
+ shmatt_t shm_nattch; /* number of current attaches */
+ unsigned long int __unused4;
+ unsigned long int __unused5;
+ };
+
+#ifdef __USE_MISC
+
+/* ipcs ctl commands */
+# define SHM_STAT 13
+# define SHM_INFO 14
+
+/* shm_mode upper byte flags */
+# define SHM_DEST 01000 /* segment will be destroyed on last detach */
+# define SHM_LOCKED 02000 /* segment will not be swapped */
+# define SHM_HUGETLB 04000 /* segment is mapped via hugetlb */
+# define SHM_NORESERVE 010000 /* don't check for reservations */
+
+struct shminfo
+ {
+ unsigned long int shmmax;
+ unsigned long int shmmin;
+ unsigned long int shmmni;
+ unsigned long int shmseg;
+ unsigned long int shmall;
+ unsigned long int __unused1;
+ unsigned long int __unused2;
+ unsigned long int __unused3;
+ unsigned long int __unused4;
+ };
+
+struct shm_info
+ {
+ int used_ids;
+ unsigned long int shm_tot; /* total allocated shm */
+ unsigned long int shm_rss; /* total resident shm */
+ unsigned long int shm_swp; /* total swapped shm */
+ unsigned long int swap_attempts;
+ unsigned long int swap_successes;
+ };
+
+#endif /* __USE_MISC */
+
+__END_DECLS