summaryrefslogtreecommitdiffstats
path: root/include/asm-x86/tsc.h (follow)
Commit message (Collapse)AuthorAgeFilesLines
* x86: vget_cycles() __always_inlineHugh Dickins2008-04-291-1/+1
| | | | | | | | | | | | | | Mark vget_cycles() as __always_inline, so gcc is never tempted to make the vsyscall vread_tsc() dive into kernel text, with resulting SIGSEGV. This was a self-inflicted wound: I've not seen that happen with unhacked sources; but for debug reasons I'd changed my x86/Makefile to compile no-unit-at-a-time, and that in conjunction with OPTIMIZE_INLINING=y ended up with vget_cycles() in kernel text. Perhaps it can happen in other ways: safer to use __always_inline. Signed-off-by: Hugh Dickins <hugh@veritas.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* "make namespacecheck" fixesIngo Molnar2008-04-241-1/+0
| | | | Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: implement prctl PR_GET_TSC and PR_SET_TSCErik Bosman2008-04-191-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | This patch implements the PR_GET_TSC and PR_SET_TSC prctl() commands on the x86 platform (both 32 and 64 bit.) These commands control the ability to read the timestamp counter from userspace (the RDTSC instruction.) While the RDTSC instuction is a useful profiling tool, it is also the source of some non-determinism in ring-3. For deterministic replay applications it is useful to be able to trap and emulate (and record the outcome of) this instruction. This patch uses code earlier used to disable the timestamp counter for the SECCOMP framework. A side-effect of this patch is that the SECCOMP environment will now also disable the timestamp counter on x86_64 due to the addition of the TIF_NOTSC define on this platform. The code which enables/disables the RDTSC instruction during context switches is in the __switch_to_xtra function, which already handles other unusual conditions, so normal performance should not have to suffer from this change. Signed-off-by: Erik Bosman <ejbosman@cs.vu.nl> Acked-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* include/asm-x86/tsc.h: checkpatch cleanups - formatting onlyJoe Perches2008-04-171-1/+1
| | | | | Signed-off-by: Joe Perches <joe@perches.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: get_cycles() fixIngo Molnar2008-01-301-3/+1
| | | | | Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: convert TSC disabling to generic cpuid disable bitmapAndi Kleen2008-01-301-2/+0
| | | | | | | | Fix from: Ian Campbell <ijc@hellion.org.uk> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: fix sched_clock()Ingo Molnar2008-01-301-1/+1
| | | | | | | [ andi@firstfloor.org: build fix ] Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: remove get_cycles_syncAndi Kleen2008-01-301-52/+8
| | | | | | | | | | | rdtsc is now speculation-safe, so no need for the sync variants of the APIs. [ mingo@elte.hu: removed the nsec_barrier() complication. ] Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: move tsc definitions to were they belongGlauber de Oliveira Costa2008-01-301-0/+4
| | | | | | | | | This patch wipes out the definitions of tsc_disable from processor_32.h and move it to tsc.h, were it belongs Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: split get_cycles_syncGlauber de Oliveira Costa2008-01-301-4/+33
| | | | | | | | | | | | | | This patch splits get_cycles_sync() into __get_cycles_sync(), and the rdtscll part. Paravirt guests cannot issue rdtscl directly, as it involves a function call in vdso area. So, using the __get_cycles_sync() base, we introduce vget_cycles_sync, which then calls the native version of rdtscll. Ideally, however, a guest should define its own clocksource, together with a vread function Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86: move tsc related declarationsThomas Gleixner2008-01-301-2/+1
| | | | | | | | tsc has also it's own header file. Nuke the stupid 64 bit ifdef while at it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
* x86: unify timex.h variantsThomas Gleixner2007-10-121-5/+6
| | | | | | | | | | Combine the timex.h variants and move the TSC related code into tsc.h. Move the set_cyc2ns_scale() call into the tsc calibraction code, where it belongs. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
* x86_64: Consolidate tsc calibrationThomas Gleixner2007-10-121-0/+4
| | | | | | | | | | | Move the TSC calibration code to tsc.c. Reimplement it so the pm timer can be used as a reference as well. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Chris Wright <chrisw@sous-sol.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
* i386/x86_64: move headers to include/asm-x86Thomas Gleixner2007-10-111-0/+75
Move the headers to include/asm-x86 and fixup the header install make rules Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-25 19:38:03 +0100