diff options
| author | Paolo Bonzini <pbonzini@redhat.com> | 2023-12-12 11:15:28 -0500 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2024-02-08 08:41:03 -0500 |
| commit | 3c7a8e190bc580813ddd9259f62971c8d2a6b5ad (patch) | |
| tree | 09e2ec9478f5d3fec2fb4af45c1df92f457a72d8 /include/uapi/linux/bits.h | |
| parent | 047371968ffc470769f541d6933e262dc7085456 (diff) | |
uapi: introduce uapi-friendly macros for GENMASK
Move __GENMASK and __GENMASK_ULL from include/ to include/uapi/ so that they can
be used to define masks in userspace API headers. Compared to what is already
in include/linux/bits.h, the definitions need to use the uglified versions of
UL(), ULL(), BITS_PER_LONG and BITS_PER_LONG_LONG (which did not even exist),
but otherwise expand to the same content.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include/uapi/linux/bits.h')
| -rw-r--r-- | include/uapi/linux/bits.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/uapi/linux/bits.h b/include/uapi/linux/bits.h new file mode 100644 index 000000000000..3c2a101986a3 --- /dev/null +++ b/include/uapi/linux/bits.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ +/* bits.h: Macros for dealing with bitmasks. */ + +#ifndef _UAPI_LINUX_BITS_H +#define _UAPI_LINUX_BITS_H + +#define __GENMASK(h, l) \ + (((~_UL(0)) - (_UL(1) << (l)) + 1) & \ + (~_UL(0) >> (__BITS_PER_LONG - 1 - (h)))) + +#define __GENMASK_ULL(h, l) \ + (((~_ULL(0)) - (_ULL(1) << (l)) + 1) & \ + (~_ULL(0) >> (__BITS_PER_LONG_LONG - 1 - (h)))) + +#endif /* _UAPI_LINUX_BITS_H */ |