Date: Wed, 30 Jan 2008 04:48:36 GMT From: John Birrell <jb@FreeBSD.org> To: Perforce Change Reviews <perforce@freebsd.org> Subject: PERFORCE change 134436 for review Message-ID: <200801300448.m0U4maYA082608@repoman.freebsd.org>
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http://perforce.freebsd.org/chv.cgi?CH=134436 Change 134436 by jb@jb_freebsd1 on 2008/01/30 04:47:37 IFdtrace Affected files ... .. //depot/projects/dtrace7/src/sys/amd64/amd64/tsc.c#2 edit Differences ... ==== //depot/projects/dtrace7/src/sys/amd64/amd64/tsc.c#2 (text+ko) ==== @@ -28,6 +28,7 @@ __FBSDID("$FreeBSD: src/sys/amd64/amd64/tsc.c,v 1.208 2007/06/04 18:25:01 dwmalone Exp $"); #include "opt_clock.h" +#include "opt_kdtrace.h" #include <sys/param.h> #include <sys/bus.h> @@ -44,6 +45,10 @@ #include <machine/md_var.h> #include <machine/specialreg.h> +#ifdef KDTRACE_HOOKS +#include <sys/dtrace_bsd.h> +#endif + #include "cpufreq_if.h" uint64_t tsc_freq; @@ -220,3 +225,18 @@ { return (rdtsc()); } + +#ifdef KDTRACE_HOOKS +/* + * DTrace needs a high resolution time function which can + * be called from a probe context and guaranteed not to have + * instrumented with probes itself. + * + * Returns nanoseconds since boot. + */ +uint64_t +dtrace_gethrtime() +{ + return (rdtsc() * (uint64_t) 1000000000 / tsc_freq); +} +#endif
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