[Xen-devel] [PATCH v4 5/9] arm/mem_access: Extend BIT-operations to unsigned long long

[Sergej Proskurin <proskurin@xxxxxxxxxxxxx>]

We extend the BIT macro to using values of unsigned long long as to
enable setting bits of 64-bit registers on AArch32.  In addition, this
commit adds a define holding the register width of 64 bit double-word
registers. This define simplifies using the associated constants in the
following commits.

Signed-off-by: Sergej Proskurin <proskurin@xxxxxxxxxxxxx>
---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
---
v4: We reused the previous commit with the msg "arm/mem_access: Add
    defines holding the width of 32/64bit regs" from v3, as we can reuse
    the already existing define BITS_PER_WORD.
---
 xen/include/asm-arm/bitops.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xen/include/asm-arm/bitops.h b/xen/include/asm-arm/bitops.h
index bda889841b..c3486d497c 100644
--- a/xen/include/asm-arm/bitops.h
+++ b/xen/include/asm-arm/bitops.h
@@ -21,7 +21,8 @@
 #define __clear_bit(n,p)          clear_bit(n,p)
 
 #define BITS_PER_WORD           32
-#define BIT(nr)                 (1UL << (nr))
+#define BITS_PER_DOUBLE_WORD    64
+#define BIT(nr)                 (1ULL << (nr))
 #define BIT_MASK(nr)            (1UL << ((nr) % BITS_PER_WORD))
 #define BIT_WORD(nr)            ((nr) / BITS_PER_WORD)
 #define BITS_PER_BYTE           8
-- 
2.12.2


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