1c5c0fdbeSDavid 'Digit' Turner /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ 2c5c0fdbeSDavid 'Digit' Turner /* const.h: Macros for dealing with constants. */ 3c5c0fdbeSDavid 'Digit' Turner 4c5c0fdbeSDavid 'Digit' Turner #ifndef _LINUX_CONST_H 5c5c0fdbeSDavid 'Digit' Turner #define _LINUX_CONST_H 6c5c0fdbeSDavid 'Digit' Turner 7c5c0fdbeSDavid 'Digit' Turner /* Some constant macros are used in both assembler and 8c5c0fdbeSDavid 'Digit' Turner * C code. Therefore we cannot annotate them always with 9c5c0fdbeSDavid 'Digit' Turner * 'UL' and other type specifiers unilaterally. We 10c5c0fdbeSDavid 'Digit' Turner * use the following macros to deal with this. 11c5c0fdbeSDavid 'Digit' Turner * 12c5c0fdbeSDavid 'Digit' Turner * Similarly, _AT() will cast an expression with a type in C, but 13c5c0fdbeSDavid 'Digit' Turner * leave it unchanged in asm. 14c5c0fdbeSDavid 'Digit' Turner */ 15c5c0fdbeSDavid 'Digit' Turner 16c5c0fdbeSDavid 'Digit' Turner #ifdef __ASSEMBLY__ 17c5c0fdbeSDavid 'Digit' Turner #define _AC(X,Y) X 18c5c0fdbeSDavid 'Digit' Turner #define _AT(T,X) X 19c5c0fdbeSDavid 'Digit' Turner #else 20c5c0fdbeSDavid 'Digit' Turner #define __AC(X,Y) (X##Y) 21c5c0fdbeSDavid 'Digit' Turner #define _AC(X,Y) __AC(X,Y) 22c5c0fdbeSDavid 'Digit' Turner #define _AT(T,X) ((T)(X)) 23c5c0fdbeSDavid 'Digit' Turner #endif 24c5c0fdbeSDavid 'Digit' Turner 25c5c0fdbeSDavid 'Digit' Turner #define _UL(x) (_AC(x, UL)) 26c5c0fdbeSDavid 'Digit' Turner #define _ULL(x) (_AC(x, ULL)) 27c5c0fdbeSDavid 'Digit' Turner 28c5c0fdbeSDavid 'Digit' Turner #define _BITUL(x) (_UL(1) << (x)) 29c5c0fdbeSDavid 'Digit' Turner #define _BITULL(x) (_ULL(1) << (x)) 30c5c0fdbeSDavid 'Digit' Turner 31*0d2eeef7SBibo Mao #if !defined(__ASSEMBLY__) 32*0d2eeef7SBibo Mao /* 33*0d2eeef7SBibo Mao * Missing __asm__ support 34*0d2eeef7SBibo Mao * 35*0d2eeef7SBibo Mao * __BIT128() would not work in the __asm__ code, as it shifts an 36*0d2eeef7SBibo Mao * 'unsigned __init128' data type as direct representation of 37*0d2eeef7SBibo Mao * 128 bit constants is not supported in the gcc compiler, as 38*0d2eeef7SBibo Mao * they get silently truncated. 39*0d2eeef7SBibo Mao * 40*0d2eeef7SBibo Mao * TODO: Please revisit this implementation when gcc compiler 41*0d2eeef7SBibo Mao * starts representing 128 bit constants directly like long 42*0d2eeef7SBibo Mao * and unsigned long etc. Subsequently drop the comment for 43*0d2eeef7SBibo Mao * GENMASK_U128() which would then start supporting __asm__ code. 44*0d2eeef7SBibo Mao */ 45*0d2eeef7SBibo Mao #define _BIT128(x) ((unsigned __int128)(1) << (x)) 46*0d2eeef7SBibo Mao #endif 47*0d2eeef7SBibo Mao 48d0bf492fSCédric Le Goater #define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1) 49c5c0fdbeSDavid 'Digit' Turner #define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask)) 50c5c0fdbeSDavid 'Digit' Turner 51c5c0fdbeSDavid 'Digit' Turner #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d)) 52c5c0fdbeSDavid 'Digit' Turner 53c5c0fdbeSDavid 'Digit' Turner #endif /* _LINUX_CONST_H */ 54