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authorErik Bosman <ebn310@few.vu.nl>2008-04-11 18:54:17 +0200
committerIngo Molnar <mingo@elte.hu>2008-04-19 19:19:55 +0200
commit8fb402bccf203ecca8f9e0202b8fd3c937dece6f (patch)
tree4f102f9cc81dedbf9271f728a4b1e6e731a6a174 /include/linux/prctl.h
parent5deb45e39b946901ae028ccd3a1d0b35fa387475 (diff)
downloadlwn-8fb402bccf203ecca8f9e0202b8fd3c937dece6f.tar.gz
lwn-8fb402bccf203ecca8f9e0202b8fd3c937dece6f.zip
generic, x86: add prctl commands PR_GET_TSC and PR_SET_TSC
This patch adds prctl commands that make it possible to deny the execution of timestamp counters in userspace. If this is not implemented on a specific architecture, prctl will return -EINVAL. ned-off-by: Erik Bosman <ejbosman@cs.vu.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include/linux/prctl.h')
-rw-r--r--include/linux/prctl.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/prctl.h b/include/linux/prctl.h
index 3800639775ae..5c80b1939636 100644
--- a/include/linux/prctl.h
+++ b/include/linux/prctl.h
@@ -67,4 +67,10 @@
#define PR_CAPBSET_READ 23
#define PR_CAPBSET_DROP 24
+/* Get/set the process' ability to use the timestamp counter instruction */
+#define PR_GET_TSC 25
+#define PR_SET_TSC 26
+# define PR_TSC_ENABLE 1 /* allow the use of the timestamp counter */
+# define PR_TSC_SIGSEGV 2 /* throw a SIGSEGV instead of reading the TSC */
+
#endif /* _LINUX_PRCTL_H */