| Greg Kroah-Hartman | 6f52b16 | 2017-11-01 15:08:43 +0100 | [diff] [blame] | 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
| Vivek Goyal | 9d291e7 | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 2 | /* const.h: Macros for dealing with constants. */ |
| 3 | |
| Masahiro Yamada | 2a6cc8a | 2018-04-10 16:36:15 -0700 | [diff] [blame] | 4 | #ifndef _UAPI_LINUX_CONST_H |
| 5 | #define _UAPI_LINUX_CONST_H |
| Vivek Goyal | 9d291e7 | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 6 | |
| 7 | /* Some constant macros are used in both assembler and |
| 8 | * C code. Therefore we cannot annotate them always with |
| Randy Dunlap | 6df95fd | 2007-05-08 00:31:11 -0700 | [diff] [blame] | 9 | * 'UL' and other type specifiers unilaterally. We |
| Vivek Goyal | 9d291e7 | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 10 | * use the following macros to deal with this. |
| Jeremy Fitzhardinge | 74ef649 | 2008-01-30 13:32:42 +0100 | [diff] [blame] | 11 | * |
| 12 | * Similarly, _AT() will cast an expression with a type in C, but |
| 13 | * leave it unchanged in asm. |
| Vivek Goyal | 9d291e7 | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 14 | */ |
| 15 | |
| 16 | #ifdef __ASSEMBLY__ |
| 17 | #define _AC(X,Y) X |
| Jeremy Fitzhardinge | 74ef649 | 2008-01-30 13:32:42 +0100 | [diff] [blame] | 18 | #define _AT(T,X) X |
| Vivek Goyal | 9d291e7 | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 19 | #else |
| 20 | #define __AC(X,Y) (X##Y) |
| 21 | #define _AC(X,Y) __AC(X,Y) |
| Jeremy Fitzhardinge | 74ef649 | 2008-01-30 13:32:42 +0100 | [diff] [blame] | 22 | #define _AT(T,X) ((T)(X)) |
| Vivek Goyal | 9d291e7 | 2007-05-02 19:27:06 +0200 | [diff] [blame] | 23 | #endif |
| 24 | |
| Masahiro Yamada | 2dd8a62 | 2018-04-10 16:36:19 -0700 | [diff] [blame] | 25 | #define _UL(x) (_AC(x, UL)) |
| 26 | #define _ULL(x) (_AC(x, ULL)) |
| 27 | |
| Masahiro Yamada | 21e7bc6 | 2018-04-10 16:36:24 -0700 | [diff] [blame] | 28 | #define _BITUL(x) (_UL(1) << (x)) |
| 29 | #define _BITULL(x) (_ULL(1) << (x)) |
| H. Peter Anvin | 2fc016c | 2013-04-27 16:07:49 -0700 | [diff] [blame] | 30 | |
| Masahiro Yamada | 2a6cc8a | 2018-04-10 16:36:15 -0700 | [diff] [blame] | 31 | #endif /* _UAPI_LINUX_CONST_H */ |