Date: Sat, 18 Nov 2000 13:59:58 +0200 From: Mark Murray <mark@grondar.za> To: arch@freebsd.org Subject: "Monotonic" counter/register call - commit candidate. Message-ID: <200011181200.eAIC00J12131@gratis.grondar.za>
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Hi
Many thanks to those of you gave me all the constructive suggestions!
Here is the commit candidate, taking into account as many of the
reasonable ones as I could.
WARNING! This is untested on Alpha and IA64.
I considered renaming the function to marks(9), as I kinda liked
that name, but on reflection, it seems way too arrogant, so
Mike Smith's "get_jiffiecounter" won.
I'm keeping the function public, as others have expressed an
interest in using it.
If this is accepted, I'll write a man 9 page for it.
I have also included some fixes for ".byte xx,yy" code to use real
Pentium opcodes (now that GAS is updated (a while back)).
M
Index: alpha/include//cpufunc.h
===================================================================
RCS file: /home/ncvs/src/sys/alpha/include/cpufunc.h,v
retrieving revision 1.9
diff -u -d -r1.9 cpufunc.h
--- alpha/include//cpufunc.h 2000/09/07 01:32:40 1.9
+++ alpha/include//cpufunc.h 2000/11/18 11:43:00
@@ -72,6 +72,15 @@
alpha_pal_swpipl(ipl);
}
+/*
+ * Standardised jiffy counter interface
+ */
+static __inline u_int64_t
+get_jiffiecount(void)
+{
+ return alpha_rpcc();
+}
+
#endif /* _KERNEL */
#endif /* !_MACHINE_CPUFUNC_H_ */
Index: i386/include//cpufunc.h
===================================================================
RCS file: /home/ncvs/src/sys/i386/include/cpufunc.h,v
retrieving revision 1.99
diff -u -d -r1.99 cpufunc.h
--- i386/include//cpufunc.h 2000/10/12 17:05:33 1.99
+++ i386/include//cpufunc.h 2000/11/18 11:18:09
@@ -397,10 +397,24 @@
{
u_int64_t rv;
- __asm __volatile(".byte 0x0f, 0x31" : "=A" (rv));
+ __asm __volatile("rdtsc" : "=A" (rv));
return (rv);
}
+/*
+ * Standardised jiffy counter interface
+ */
+static __inline u_int64_t
+get_jiffiecount(void)
+{
+#if defined(I386_CPU) || defined(I486_CPU)
+ if (!tsc_present)
+ return nanotime();
+ else
+#endif
+ return rdtsc();
+}
+
static __inline void
wbinvd(void)
{
@@ -416,7 +430,7 @@
static __inline void
wrmsr(u_int msr, u_int64_t newval)
{
- __asm __volatile(".byte 0x0f, 0x30" : : "A" (newval), "c" (msr));
+ __asm __volatile("wrmsr" : : "A" (newval), "c" (msr));
}
static __inline u_int
Index: ia64/include//cpufunc.h
===================================================================
RCS file: /home/ncvs/src/sys/ia64/include/cpufunc.h,v
retrieving revision 1.1
diff -u -d -r1.1 cpufunc.h
--- ia64/include//cpufunc.h 2000/09/29 13:46:05 1.1
+++ ia64/include//cpufunc.h 2000/11/18 11:46:01
@@ -32,6 +32,7 @@
#ifdef _KERNEL
#include <sys/types.h>
+#include <machine/ia64_cpu.h>
#ifdef __GNUC__
@@ -190,6 +191,15 @@
restore_intr(u_int psr)
{
__asm __volatile ("mov psr.l=%0;; srlz.d" :: "r" (psr));
+}
+
+/*
+ * Standardised jiffy counter interface
+ */
+static __inline u_int64_t
+get_jiffiecount(void)
+{
+ return ia64_get_itc();
}
#endif /* _KERNEL */
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