[PATCH] x86-64: safe_apic_wait_icr_idle - x86_64

[linux-2.6-omap-h63xx.git] / arch / x86_64 / kernel / apic.c

diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index 3421f21b6c70c15c811508287a9565fb57c79a78..943ec4d1bd8eae4d06afbc7ca56b5bef50bf6c68 100644 (file)
--- 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;