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authorThomas Gleixner <tglx@linutronix.de>2007-10-11 11:16:51 +0200
committerThomas Gleixner <tglx@linutronix.de>2007-10-11 11:16:51 +0200
commit9702785a747aa27baf46ff504beab6528f21f2dd (patch)
treeab69d6f802f5b680c33999dc089e44982c74595d /arch/x86/xen/multicalls.h
parent334e621a01f86d5bc25e4f742e1eaae6e2d2a97a (diff)
i386: move xen
Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/xen/multicalls.h')
-rw-r--r--arch/x86/xen/multicalls.h45
1 files changed, 45 insertions, 0 deletions
diff --git a/arch/x86/xen/multicalls.h b/arch/x86/xen/multicalls.h
new file mode 100644
index 000000000000..e6f7530b156c
--- /dev/null
+++ b/arch/x86/xen/multicalls.h
@@ -0,0 +1,45 @@
+#ifndef _XEN_MULTICALLS_H
+#define _XEN_MULTICALLS_H
+
+#include "xen-ops.h"
+
+/* Multicalls */
+struct multicall_space
+{
+ struct multicall_entry *mc;
+ void *args;
+};
+
+/* Allocate room for a multicall and its args */
+struct multicall_space __xen_mc_entry(size_t args);
+
+DECLARE_PER_CPU(unsigned long, xen_mc_irq_flags);
+
+/* Call to start a batch of multiple __xen_mc_entry()s. Must be
+ paired with xen_mc_issue() */
+static inline void xen_mc_batch(void)
+{
+ /* need to disable interrupts until this entry is complete */
+ local_irq_save(__get_cpu_var(xen_mc_irq_flags));
+}
+
+static inline struct multicall_space xen_mc_entry(size_t args)
+{
+ xen_mc_batch();
+ return __xen_mc_entry(args);
+}
+
+/* Flush all pending multicalls */
+void xen_mc_flush(void);
+
+/* Issue a multicall if we're not in a lazy mode */
+static inline void xen_mc_issue(unsigned mode)
+{
+ if ((xen_get_lazy_mode() & mode) == 0)
+ xen_mc_flush();
+
+ /* restore flags saved in xen_mc_batch */
+ local_irq_restore(x86_read_percpu(xen_mc_irq_flags));
+}
+
+#endif /* _XEN_MULTICALLS_H */