From b26c48639934453fa038b7cb2ddb55d502f4c1de Mon Sep 17 00:00:00 2001 From: Baruch Siach Date: Sun, 11 Nov 2018 12:31:00 +0200 Subject: [PATCH] linux/const.h: import from kernel Combine the uapi/linux/const.h header into the kernel linux/const.h. The next commit will use the _AC macro this header instead of the common.h definition. Based on Linux kernel version 4.19. Signed-off-by: Baruch Siach Reviewed-by: Tom Rini Signed-off-by: Stefan Roese --- include/linux/const.h | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 include/linux/const.h diff --git a/include/linux/const.h b/include/linux/const.h new file mode 100644 index 0000000000..379c889232 --- /dev/null +++ b/include/linux/const.h @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +#ifndef _LINUX_CONST_H +#define _LINUX_CONST_H + +/* const.h: Macros for dealing with constants. */ + +/* 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)) + +#define UL(x) (_UL(x)) +#define ULL(x) (_ULL(x)) + +#endif /* _LINUX_CONST_H */