ceph/0002-Add-support-for-PPC-arch.patch

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2015-04-16 11:09:24 +00:00
From b2781fb5638afae7438b983a912ede126a8c5b85 Mon Sep 17 00:00:00 2001
From: James Page <james.page@ubuntu.com>
Date: Fri, 13 Mar 2015 19:46:04 +0000
Subject: [PATCH] Add support for PPC architecture, provide fallback
Add high precision cpu cycles support for powerpc and powerpc64.
Provide a fallback for other architectures and warn during
compilation.
Signed-off-by: James Page <james.page@ubuntu.com>
diff --git a/src/common/Cycles.h b/src/common/Cycles.h
index 6e47cde..bb47d5c 100644
--- a/src/common/Cycles.h
+++ b/src/common/Cycles.h
@@ -72,8 +72,15 @@ class Cycles {
uint64_t cntvct;
asm volatile ("isb; mrs %0, cntvct_el0; isb; " : "=r" (cntvct) :: "memory");
return cntvct;
+#elif defined(__powerpc__) || defined (__powerpc64__)
+ // Based on:
+ // https://github.com/randombit/botan/blob/net.randombit.botan/src/lib/entropy/hres_timer/hres_timer.cpp
+ uint32_t lo = 0, hi = 0;
+ asm volatile("mftbu %0; mftb %1" : "=r" (hi), "=r" (lo));
+ return (((uint64_t)hi << 32) | lo);
#else
-#error No high-precision counter available for your OS/arch
+#warning No high-precision counter available for your OS/arch
+ return 0;
#endif
}