powerpc: enable cpu clock for powerpc64

[fio.git] / arch / arch-ppc.h

diff --git a/arch/arch-ppc.h b/arch/arch-ppc.h
index aed41f9bad6d53d6ee06978f95e8e1d131ce4a8a..161c39c511937c9a0d4604a69fa3f63da1825f26 100644 (file)
--- a/arch/arch-ppc.h
+++ b/arch/arch-ppc.h
@@ -67,6 +67,21 @@ static inline unsigned int mfspr(unsigned int reg)
 #define SPRN_ATBL  0x20E /* Alternate Time Base Lower */
 #define SPRN_ATBU  0x20F /* Alternate Time Base Upper */
 
+#ifdef __powerpc64__
+static inline unsigned long long get_cpu_clock(void)
+{
+       unsigned long long rval;
+
+       asm volatile(
+               "90:    mfspr %0, %1;\n"
+               "       cmpwi %0,0;\n"
+               "       beq-  90b;\n"
+       : "=r" (rval)
+       : "i" (SPRN_TBRL));
+
+       return rval;
+}
+#else
 static inline unsigned long long get_cpu_clock(void)
 {
        unsigned int tbl, tbu0, tbu1;
@@ -87,6 +102,7 @@ static inline unsigned long long get_cpu_clock(void)
        ret = (((unsigned long long)tbu0) << 32) | tbl;
        return ret;
 }
+#endif
 
 #if 0
 static void atb_child(void)
@@ -136,4 +152,12 @@ static inline int arch_init(char *envp[])
  * #define ARCH_HAVE_CPU_CLOCK
  */
 
+/*
+ * Let's have it defined for ppc64
+ */
+
+#ifdef __powerpc64__
+#define ARCH_HAVE_CPU_CLOCK
+#endif
+
 #endif