--- /dev/null
+#include <linux/module.h>
+#include <linux/smp.h>
+#include <asm/irqflags.h>
+#include <asm/hypervisor.h>
+
+/* interrupt control.. */
+
+/*
+ * The use of 'barrier' in the following reflects their use as local-lock
+ * operations. Reentrancy must be prevented (e.g., __cli()) /before/ following
+ * critical operations are executed. All critical operations must complete
+ * /before/ reentrancy is permitted (e.g., __sti()). Alpha architecture also
+ * includes these barriers, for example.
+ */
+
+unsigned long __raw_local_save_flags(void)
+{
+ struct vcpu_info *_vcpu;
+ unsigned long flags;
+
+ preempt_disable();
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ flags = _vcpu->evtchn_upcall_mask;
+ preempt_enable();
+
+ return flags;
+}
+EXPORT_SYMBOL(__raw_local_save_flags);
+
+void raw_local_irq_restore(unsigned long flags)
+{
+ struct vcpu_info *_vcpu;
+
+ preempt_disable();
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ if ((_vcpu->evtchn_upcall_mask = flags) == 0) {
+ barrier(); /* unmask then check (avoid races) */
+ if (unlikely(_vcpu->evtchn_upcall_pending))
+ force_evtchn_callback();
+ preempt_enable();
+ } else
+ preempt_enable_no_resched();
+
+}
+EXPORT_SYMBOL(raw_local_irq_restore);
+
+void raw_local_irq_disable(void)
+{
+ struct vcpu_info *_vcpu;
+
+ preempt_disable();
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ _vcpu->evtchn_upcall_mask = 1;
+ preempt_enable_no_resched();
+}
+EXPORT_SYMBOL(raw_local_irq_disable);
+
+void raw_local_irq_enable(void)
+{
+ struct vcpu_info *_vcpu;
+
+ preempt_disable();
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ _vcpu->evtchn_upcall_mask = 0;
+ barrier(); /* unmask then check (avoid races) */
+ if (unlikely(_vcpu->evtchn_upcall_pending))
+ force_evtchn_callback();
+ preempt_enable();
+}
+EXPORT_SYMBOL(raw_local_irq_enable);
+
+/* Cannot use preempt_enable() here as we would recurse in preempt_sched(). */
+int raw_irqs_disabled(void)
+{
+ struct vcpu_info *_vcpu;
+ int disabled;
+
+ preempt_disable();
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ disabled = (_vcpu->evtchn_upcall_mask != 0);
+ preempt_enable_no_resched();
+ return disabled;
+}
+EXPORT_SYMBOL(raw_irqs_disabled);
+
+unsigned long __raw_local_irq_save(void)
+{
+ struct vcpu_info *_vcpu;
+ unsigned long flags;
+
+ preempt_disable();
+ _vcpu = &HYPERVISOR_shared_info->vcpu_info[__vcpu_id];
+ flags = _vcpu->evtchn_upcall_mask;
+ _vcpu->evtchn_upcall_mask = 1;
+ preempt_enable_no_resched();
+
+ return flags;
+}
+EXPORT_SYMBOL(__raw_local_irq_save);