[PATCH V2 1/2] uapi: Define GENMASK_U128

Anshuman Khandual
2024-07-25T05:48:20Z

This adds GENMASK_U128() and __GENMASK_U128() macros using __BITS_PER_U128
and __int128 data types. These macros will be used in providing support for
generating 128 bit masks.

Cc: Yury Norov <yury.norov@gmail.com>
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Arnd Bergmann <arnd@arndb.de>>
Cc: linux-kernel@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
include/linux/bits.h | 2 ++
include/uapi/asm-generic/bitsperlong.h | 2 ++
include/uapi/linux/bits.h | 3 +++
include/uapi/linux/const.h | 1 +
4 files changed, 8 insertions(+)

diff --git a/include/linux/bits.h b/include/linux/bits.h
index 0eb24d21aac2..0a174cce09d2 100644
--- a/include/linux/bits.h
+++ b/include/linux/bits.h
@@ -35,5 +35,7 @@
(GENMASK_INPUT_CHECK(h, l) + __GENMASK(h, l))
#define GENMASK_ULL(h, l) \
(GENMASK_INPUT_CHECK(h, l) + __GENMASK_ULL(h, l))
+#define GENMASK_U128(h, l) \
+ (GENMASK_INPUT_CHECK(h, l) + __GENMASK_U128(h, l))

#endif /* __LINUX_BITS_H */
diff --git a/include/uapi/asm-generic/bitsperlong.h b/include/uapi/asm-generic/bitsperlong.h
index fadb3f857f28..6275367b17bb 100644
--- a/include/uapi/asm-generic/bitsperlong.h
+++ b/include/uapi/asm-generic/bitsperlong.h
@@ -28,4 +28,6 @@
#define __BITS_PER_LONG_LONG 64
#endif

+#define __BITS_PER_U128 128
+
#endif /* _UAPI__ASM_GENERIC_BITS_PER_LONG */
diff --git a/include/uapi/linux/bits.h b/include/uapi/linux/bits.h
index 3c2a101986a3..4d4b7b08003c 100644
--- a/include/uapi/linux/bits.h
+++ b/include/uapi/linux/bits.h
@@ -12,4 +12,7 @@
(((~_ULL(0)) - (_ULL(1) << (l)) + 1) & \
(~_ULL(0) >> (__BITS_PER_LONG_LONG - 1 - (h))))

+#define __GENMASK_U128(h, l) \
+ ((_BIT128((h) + 1)) - (_BIT128(l)))
+
#endif /* _UAPI_LINUX_BITS_H */
diff --git a/include/uapi/linux/const.h b/include/uapi/linux/const.h
index a429381e7ca5..a0211136dfd8 100644
--- a/include/uapi/linux/const.h
+++ b/include/uapi/linux/const.h
@@ -27,6 +27,7 @@

#define _BITUL(x) (_UL(1) << (x))
#define _BITULL(x) (_ULL(1) << (x))
+#define _BIT128(x) ((unsigned __int128)(1) << (x))

#define __ALIGN_KERNEL(x, a) __ALIGN_KERNEL_MASK(x, (__typeof__(x))(a) - 1)
#define __ALIGN_KERNEL_MASK(x, mask) (((x) + (mask)) & ~(mask))
--
2.30.2