1 files changed, 22 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 3421f21b6c70..943ec4d1bd8e 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -68,6 +68,28 @@ int using_apic_timer __read_mostly = 0;
 
 static void apic_pm_activate(void);
 
+void apic_wait_icr_idle(void)
+{
+        while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
+                cpu_relax();
+}
+
+unsigned int safe_apic_wait_icr_idle(void)
+{
+        unsigned int send_status;
+        int timeout;
+
+        timeout = 0;
+        do {
+                send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
+                if (!send_status)
+                        break;
+                udelay(100);
+        } while (timeout++ < 1000);
+
+        return send_status;
+}
+
 void enable_NMI_through_LVT0 (void * dummy)
 {
         unsigned int v;