[PATCH v2 01/10] import _AC and UL macros from linux kernel

[Antony Pavlov <antonynpavlov@gmail.com>]

This macros are used in exported from linux TI DaVinci code.
Also this macros are used in MIPS cache support code.

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
---
 arch/arm/include/asm/memory.h |  7 +++++++
 include/linux/const.h         | 27 +++++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index 28afaa3..52114d0 100644
--- a/arch/arm/include/asm/memory.h
+++ b/arch/arm/include/asm/memory.h
@@ -3,6 +3,13 @@
 
 #include <memory.h>
 
+#include <linux/const.h>
+/*
+ * Allow for constants defined here to be used from assembly code
+ * by prepending the UL suffix only with actual C code compilation.
+ */
+#define UL(x) _AC(x, UL)
+
 static inline void arm_add_mem_device(const char* name, resource_size_t start,
 				    resource_size_t size)
 {
diff --git a/include/linux/const.h b/include/linux/const.h
new file mode 100644
index 0000000..c872bfd
--- /dev/null
+++ b/include/linux/const.h
@@ -0,0 +1,27 @@
+/* const.h: Macros for dealing with constants.  */
+
+#ifndef _LINUX_CONST_H
+#define _LINUX_CONST_H
+
+/* Some constant macros are used in both assembler and
+ * C code.  Therefore we cannot annotate them always with
+ * 'UL' and other type specifiers unilaterally.  We
+ * use the following macros to deal with this.
+ *
+ * Similarly, _AT() will cast an expression with a type in C, but
+ * leave it unchanged in asm.
+ */
+
+#ifdef __ASSEMBLY__
+#define _AC(X,Y)	X
+#define _AT(T,X)	X
+#else
+#define __AC(X,Y)	(X##Y)
+#define _AC(X,Y)	__AC(X,Y)
+#define _AT(T,X)	((T)(X))
+#endif
+
+#define _BITUL(x)	(_AC(1,UL) << (x))
+#define _BITULL(x)	(_AC(1,ULL) << (x))
+
+#endif /* !(_LINUX_CONST_H) */
-- 
1.9.0


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