From: Tim Deegan <tim@xen.org>
Date: Tue, 13 Mar 2012 15:11:00 +0000 (+0000)
Subject: arm: Put the CPU into a sleep state in the idle loop
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=d6df6607425f170ac601ba3559ea253fed4f0511;p=xen.git

arm: Put the CPU into a sleep state in the idle loop

The ARM doesn't actually say that the WFI instruction will return
immediately if CPSR.I is clear and an instruction is pending, but
this seems to match up with how linux uses it.

Signed-off-by: Tim Deegan <tim@xen.org>
Committed-by: Ian Campbell <ian.campbell@citrix.com>
---

diff --git a/xen/arch/arm/domain.c b/xen/arch/arm/domain.c
index e1d500df5c..edaff2252a 100644
--- a/xen/arch/arm/domain.c
+++ b/xen/arch/arm/domain.c
@@ -34,7 +34,11 @@ void idle_loop(void)
         if ( cpu_is_offline(smp_processor_id()) )
             stop_cpu();
 
-        /* TODO: (*pm_idle)(); */
+        local_irq_disable();
+        if ( cpu_is_haltable(smp_processor_id()) )
+            asm volatile ("dsb; wfi");
+        local_irq_enable();
+
         do_tasklet();
         do_softirq();
     }