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-rw-r--r--arch/i386/kernel/apic.c22
1 files changed, 22 insertions, 0 deletions
diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c
index 93aa911646a..aca054cc055 100644
--- a/arch/i386/kernel/apic.c
+++ b/arch/i386/kernel/apic.c
@@ -129,6 +129,28 @@ static int modern_apic(void)
return lapic_get_version() >= 0x14;
}
+void apic_wait_icr_idle(void)
+{
+ while (apic_read(APIC_ICR) & APIC_ICR_BUSY)
+ cpu_relax();
+}
+
+unsigned long safe_apic_wait_icr_idle(void)
+{
+ unsigned long 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;
+}
+
/**
* enable_NMI_through_LVT0 - enable NMI through local vector table 0
*/