diff options
| author | Baruch Siach <baruch@tkos.co.il> | 2018-11-11 12:31:00 +0200 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2018-11-20 13:08:15 +0100 |
| commit | b26c48639934453fa038b7cb2ddb55d502f4c1de (patch) | |
| tree | df3cfec32c20cd6b81c9545c6e4716dc7ad6b0bf /include/linux | |
| parent | d73d81fd85e4a030ade42c4b2d13466d45090aa3 (diff) | |
| download | u-boot-b26c48639934453fa038b7cb2ddb55d502f4c1de.tar.gz | |
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 <baruch@tkos.co.il>
Reviewed-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/const.h | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/include/linux/const.h b/include/linux/const.h new file mode 100644 index 00000000000..379c8892326 --- /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 */ |