| 1 | /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ |
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| 2 | /* const.h: Macros for dealing with constants. */ |
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| 3 | |
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| 4 | #ifndef _UAPI_LINUX_CONST_H |
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| 5 | #define _UAPI_LINUX_CONST_H |
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| 6 | |
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| 7 | /* Some constant macros are used in both assembler and |
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| 8 | * C code. Therefore we cannot annotate them always with |
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| 9 | * 'UL' and other type specifiers unilaterally. We |
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| 10 | * use the following macros to deal with this. |
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| 11 | * |
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| 12 | * Similarly, _AT() will cast an expression with a type in C, but |
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| 13 | * leave it unchanged in asm. |
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| 14 | */ |
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| 15 | |
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| 16 | #ifdef __ASSEMBLY__ |
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| 17 | #define _AC(X,Y) X |
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| 18 | #define _AT(T,X) X |
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| 19 | #else |
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| 20 | #define __AC(X,Y) (X##Y) |
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| 21 | #define _AC(X,Y) __AC(X,Y) |
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| 22 | #define _AT(T,X) ((T)(X)) |
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| 23 | #endif |
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| 24 | |
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| 25 | #define _UL(x) (_AC(x, UL)) |
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| 26 | #define _ULL(x) (_AC(x, ULL)) |
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| 27 | |
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| 28 | #define _BITUL(x) (_UL(1) << (x)) |
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| 29 | #define _BITULL(x) (_ULL(1) << (x)) |
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| 30 | |
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| 31 | #if !defined(__ASSEMBLY__) |
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| 32 | /* |
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| 33 | * Missing asm support |
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| 34 | * |
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| 35 | * __BIT128() would not work in the asm code, as it shifts an |
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| 36 | * 'unsigned __int128' data type as direct representation of |
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| 37 | * 128 bit constants is not supported in the gcc compiler, as |
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| 38 | * they get silently truncated. |
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| 39 | * |
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| 40 | * TODO: Please revisit this implementation when gcc compiler |
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| 41 | * starts representing 128 bit constants directly like long |
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| 42 | * and unsigned long etc. Subsequently drop the comment for |
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| 43 | * GENMASK_U128() which would then start supporting asm code. |
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| 44 | */ |
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| 45 | #define _BIT128(x) ((unsigned __int128)(1) << (x)) |
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| 46 | #endif |
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| 47 | |
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| 48 | #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1) |
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| 49 | #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) |
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| 50 | |
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| 51 | #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) |
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| 52 | |
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| 53 | #endif /* _UAPI_LINUX_CONST_H */ |
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| 54 | |
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