1 files changed, 31 insertions, 0 deletions

diff --git a/tools/include/uapi/linux/const.h b/tools/include/uapi/linux/const.h
new file mode 100644
index 000000000000..5ed721ad5b19
--- /dev/null
+++ b/tools/include/uapi/linux/const.h
@@ -0,0 +1,31 @@
+/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
+/* const.h: Macros for dealing with constants.  */
+
+#ifndef _UAPI_LINUX_CONST_H
+#define _UAPI_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 _UL(x)          (_AC(x, UL))
+#define _ULL(x)         (_AC(x, ULL))
+
+#define _BITUL(x)       (_UL(1) << (x))
+#define _BITULL(x)      (_ULL(1) << (x))
+
+#endif /* _UAPI_LINUX_CONST_H */