From: Julien Grall <julien.grall@arm.com>
To: xen-devel@lists.xen.org
Cc: sstabellini@kernel.org, Keir Fraser <keir@xen.org>,
andre.przywara@arm.com, Ian Jackson <ian.jackson@eu.citrix.com>,
Tim Deegan <tim@xen.org>, Julien Grall <julien.grall@arm.com>,
Jan Beulich <jbeulich@suse.com>
Subject: [for-4.7 1/2] xen/bitops: Introduce macros to generate mask
Date: Wed, 13 Apr 2016 16:55:30 +0100 [thread overview]
Message-ID: <1460562931-19858-2-git-send-email-julien.grall@arm.com> (raw)
In-Reply-To: <1460562931-19858-1-git-send-email-julien.grall@arm.com>
The code has been imported from the header include/linux/bitops.h in
Linux v4.6-rc3.
Signed-off-by: Julien Grall <julien.grall@arm.com>
---
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Keir Fraser <keir@xen.org>
Cc: Tim Deegan <tim@xen.org>
---
xen/include/xen/bitops.h | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/xen/include/xen/bitops.h b/xen/include/xen/bitops.h
index cb56f24..e1a4d93 100644
--- a/xen/include/xen/bitops.h
+++ b/xen/include/xen/bitops.h
@@ -3,6 +3,17 @@
#include <asm/types.h>
/*
+ * Create a contiguous bitmask starting at bit position @l and ending at
+ * position @h. For example
+ * GENMASK_ULL(39, 21) gives us the 64bit vector 0x000000ffffe00000.
+ */
+#define GENMASK(h, l) \
+ (((~0UL) << (l)) & (~0UL >> (BITS_PER_LONG - 1 - (h))))
+
+#define GENMASK_ULL(h, l) \
+ (((~0ULL) << (l)) & (~0ULL >> (BITS_PER_LONG_LONG - 1 - (h))))
+
+/*
* ffs: find first bit set. This is defined the same way as
* the libc and compiler builtin ffs routines, therefore
* differs in spirit from the above ffz (man ffs).
--
1.9.1
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next prev parent reply other threads:[~2016-04-13 15:55 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-13 15:55 [for-4.7 0/2] xen/arm: traps: Correctly interpret the content of the register HPFAR_EL2 Julien Grall
2016-04-13 15:55 ` Julien Grall [this message]
2016-04-13 18:07 ` [for-4.7 1/2] xen/bitops: Introduce macros to generate mask Stefano Stabellini
2016-04-13 18:14 ` Andrew Cooper
2016-04-14 8:47 ` Julien Grall
2016-04-14 4:01 ` Jan Beulich
2016-04-14 8:55 ` Julien Grall
2016-04-14 14:56 ` Jan Beulich
2016-04-14 15:08 ` Julien Grall
2016-04-14 15:23 ` Jan Beulich
2016-04-20 12:35 ` Julien Grall
2016-04-20 16:43 ` Jan Beulich
2016-04-22 11:33 ` Julien Grall
2016-04-22 11:49 ` Stefano Stabellini
2016-04-22 15:33 ` Julien Grall
2016-04-22 15:42 ` Stefano Stabellini
2016-04-13 15:55 ` [for-4.7 2/2] xen/arm: traps: Correctly interpret the content of the register HPFAR_EL2 Julien Grall
2016-04-13 18:17 ` Stefano Stabellini
2016-04-13 19:11 ` Tamas K Lengyel
2016-04-13 20:33 ` André Przywara
2016-04-14 17:47 ` [for-4.7 0/2] " Wei Liu
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