[IA64] VIRT_CPU_ACCOUNTING (accurate cpu time accounting)

[safe/jmp/linux-2.6] / arch / ia64 / kernel / head.S

diff --git a/arch/ia64/kernel/head.S b/arch/ia64/kernel/head.S
index d3a41d5..ddeab4e 100644 (file)
--- 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