1 files changed, 93 insertions, 0 deletions
diff --git a/include/linux/immediate.h b/include/linux/immediate.h
new file mode 100644
index 00000000000..0d62cab5c2e
--- /dev/null
+++ b/include/linux/immediate.h
@@ -0,0 +1,93 @@
+#ifndef _LINUX_IMMEDIATE_H
+#define _LINUX_IMMEDIATE_H
+
+/*
+ * Immediate values, can be updated at runtime and save cache lines.
+ *
+ * (C) Copyright 2007 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * Dual BSD/GPL v2 license.
+ */
+
+#ifdef CONFIG_IMMEDIATE
+
+struct __imv {
+	unsigned long var;	/* Pointer to the identifier variable of the
+				 * immediate value
+				 */
+	unsigned long imv;	/*
+				 * Pointer to the memory location of the
+				 * immediate value within the instruction.
+				 */
+	unsigned char size;	/* Type size. */
+} __attribute__ ((packed));
+
+#include <asm/immediate.h>
+
+/**
+ * imv_set - set immediate variable (with locking)
+ * @name: immediate value name
+ * @i: required value
+ *
+ * Sets the value of @name, taking the module_mutex if required by
+ * the architecture.
+ */
+#define imv_set(name, i)						\
+	do {								\
+		name##__imv = (i);					\
+		core_imv_update();					\
+		module_imv_update();					\
+	} while (0)
+
+/*
+ * Internal update functions.
+ */
+extern void core_imv_update(void);
+extern void imv_update_range(const struct __imv *begin,
+	const struct __imv *end);
+
+#else
+
+/*
+ * Generic immediate values: a simple, standard, memory load.
+ */
+
+/**
+ * imv_read - read immediate variable
+ * @name: immediate value name
+ *
+ * Reads the value of @name.
+ */
+#define imv_read(name)			_imv_read(name)
+
+/**
+ * imv_set - set immediate variable (with locking)
+ * @name: immediate value name
+ * @i: required value
+ *
+ * Sets the value of @name, taking the module_mutex if required by
+ * the architecture.
+ */
+#define imv_set(name, i)		(name##__imv = (i))
+
+static inline void core_imv_update(void) { }
+static inline void module_imv_update(void) { }
+
+#endif
+
+#define DECLARE_IMV(type, name) extern __typeof__(type) name##__imv
+#define DEFINE_IMV(type, name)  __typeof__(type) name##__imv
+
+#define EXPORT_IMV_SYMBOL(name) EXPORT_SYMBOL(name##__imv)
+#define EXPORT_IMV_SYMBOL_GPL(name) EXPORT_SYMBOL_GPL(name##__imv)
+
+/**
+ * _imv_read - Read immediate value with standard memory load.
+ * @name: immediate value name
+ *
+ * Force a data read of the immediate value instead of the immediate value
+ * based mechanism. Useful for __init and __exit section data read.
+ */
+#define _imv_read(name)		(name##__imv)
+
+#endif