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s390: introduce register pair union 

Introduce a register pair union, which is supposed to be used for
inline assemblies where instructions require parameters in even/odd
numbered register pairs.

This is more or less the same register pair construct which was
available for 31 bit builds which was removed with commit 5a79859ae0
("s390: remove 31 bit support").

Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-06-09 22:59:13 +02:00 committed by Vasily Gorbik
parent 6b8ed17095
commit c4655a2098
1 changed files with 19 additions and 0 deletions
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19
arch/s390/include/asm/types.h Normal file
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/* SPDX-License-Identifier: GPL-2.0-or-later */
#ifndef _ASM_S390_TYPES_H
#define _ASM_S390_TYPES_H
#include <uapi/asm/types.h>
#ifndef __ASSEMBLY__
union register_pair {
unsigned __int128 pair;
struct {
unsigned long even;
unsigned long odd;
};
};
#endif /* __ASSEMBLY__ */
#endif /* _ASM_S390_TYPES_H */