xref: /kvm-unit-tests/lib/linux/const.h (revision 0cc3a351b925928827baa4b69cf0e46ff5837083)
1f3bd1e05SAndrew Jones /* const.h: Macros for dealing with constants.  */
2f3bd1e05SAndrew Jones 
3f3bd1e05SAndrew Jones #ifndef _LINUX_CONST_H
4f3bd1e05SAndrew Jones #define _LINUX_CONST_H
5f3bd1e05SAndrew Jones 
6f3bd1e05SAndrew Jones /* Some constant macros are used in both assembler and
7f3bd1e05SAndrew Jones  * C code.  Therefore we cannot annotate them always with
8f3bd1e05SAndrew Jones  * 'UL' and other type specifiers unilaterally.  We
9f3bd1e05SAndrew Jones  * use the following macros to deal with this.
10f3bd1e05SAndrew Jones  *
11f3bd1e05SAndrew Jones  * Similarly, _AT() will cast an expression with a type in C, but
12f3bd1e05SAndrew Jones  * leave it unchanged in asm.
13f3bd1e05SAndrew Jones  */
14f3bd1e05SAndrew Jones 
15*0cc3a351SSean Christopherson #ifdef __ASSEMBLER__
16f3bd1e05SAndrew Jones #define _AC(X,Y)	X
17f3bd1e05SAndrew Jones #define _AT(T,X)	X
1822f287f4SAndrew Jones #define __ASM_STR(X)	X
19f3bd1e05SAndrew Jones #else
20f3bd1e05SAndrew Jones #define __AC(X,Y)	(X##Y)
21f3bd1e05SAndrew Jones #define _AC(X,Y)	__AC(X,Y)
22f3bd1e05SAndrew Jones #define _AT(T,X)	((T)(X))
2322f287f4SAndrew Jones #define __ASM_STR(X)	#X
24f3bd1e05SAndrew Jones #endif
25f3bd1e05SAndrew Jones 
26f3bd1e05SAndrew Jones #define _BITUL(x)	(_AC(1,UL) << (x))
27f3bd1e05SAndrew Jones #define _BITULL(x)	(_AC(1,ULL) << (x))
28f3bd1e05SAndrew Jones 
29f3bd1e05SAndrew Jones #endif /* !(_LINUX_CONST_H) */
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