1*b3c818a4SEric Farman /* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
2*b3c818a4SEric Farman /* const.h: Macros for dealing with constants.  */
3*b3c818a4SEric Farman 
4*b3c818a4SEric Farman #ifndef _LINUX_CONST_H
5*b3c818a4SEric Farman #define _LINUX_CONST_H
6*b3c818a4SEric Farman 
7*b3c818a4SEric Farman /* Some constant macros are used in both assembler and
8*b3c818a4SEric Farman  * C code.  Therefore we cannot annotate them always with
9*b3c818a4SEric Farman  * 'UL' and other type specifiers unilaterally.  We
10*b3c818a4SEric Farman  * use the following macros to deal with this.
11*b3c818a4SEric Farman  *
12*b3c818a4SEric Farman  * Similarly, _AT() will cast an expression with a type in C, but
13*b3c818a4SEric Farman  * leave it unchanged in asm.
14*b3c818a4SEric Farman  */
15*b3c818a4SEric Farman 
16*b3c818a4SEric Farman #ifdef __ASSEMBLY__
17*b3c818a4SEric Farman #define _AC(X,Y)	X
18*b3c818a4SEric Farman #define _AT(T,X)	X
19*b3c818a4SEric Farman #else
20*b3c818a4SEric Farman #define __AC(X,Y)	(X##Y)
21*b3c818a4SEric Farman #define _AC(X,Y)	__AC(X,Y)
22*b3c818a4SEric Farman #define _AT(T,X)	((T)(X))
23*b3c818a4SEric Farman #endif
24*b3c818a4SEric Farman 
25*b3c818a4SEric Farman #define _UL(x)		(_AC(x, UL))
26*b3c818a4SEric Farman #define _ULL(x)		(_AC(x, ULL))
27*b3c818a4SEric Farman 
28*b3c818a4SEric Farman #define _BITUL(x)	(_UL(1) << (x))
29*b3c818a4SEric Farman #define _BITULL(x)	(_ULL(1) << (x))
30*b3c818a4SEric Farman 
31*b3c818a4SEric Farman #define __ALIGN_KERNEL(x, a)		__ALIGN_KERNEL_MASK(x, (typeof(x))(a) - 1)
32*b3c818a4SEric Farman #define __ALIGN_KERNEL_MASK(x, mask)	(((x) + (mask)) & ~(mask))
33*b3c818a4SEric Farman 
34*b3c818a4SEric Farman #define __KERNEL_DIV_ROUND_UP(n, d) (((n) + (d) - 1) / (d))
35*b3c818a4SEric Farman 
36*b3c818a4SEric Farman #endif /* _LINUX_CONST_H */
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