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-rw-r--r--arch/ia64/kernel/head.S20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index d3a41d5f8d12..ddeab4e36fd5 100644
--- a/arch/ia64/kernel/head.S
+++ b/arch/ia64/kernel/head.S
@@ -1002,6 +1002,26 @@ GLOBAL_ENTRY(sched_clock)
br.ret.sptk.many rp
END(sched_clock)
+#ifdef CONFIG_VIRT_CPU_ACCOUNTING
+GLOBAL_ENTRY(cycle_to_cputime)
+ alloc r16=ar.pfs,1,0,0,0
+ addl r8=THIS_CPU(cpu_info) + IA64_CPUINFO_NSEC_PER_CYC_OFFSET,r0
+ ;;
+ ldf8 f8=[r8]
+ ;;
+ setf.sig f9=r32
+ ;;
+ xmpy.lu f10=f9,f8 // calculate low 64 bits of 128-bit product (4 cyc)
+ xmpy.hu f11=f9,f8 // calculate high 64 bits of 128-bit product
+ ;;
+ getf.sig r8=f10 // (5 cyc)
+ getf.sig r9=f11
+ ;;
+ shrp r8=r9,r8,IA64_NSEC_PER_CYC_SHIFT
+ br.ret.sptk.many rp
+END(cycle_to_cputime)
+#endif /* CONFIG_VIRT_CPU_ACCOUNTING */
+
GLOBAL_ENTRY(start_kernel_thread)
.prologue
.save rp, r0 // this is the end of the call-chain