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[Qemu-devel] [PATCH v7 01/12] bitops: Add MAKE_64BIT_MASK macro
From: |
Alistair Francis |
Subject: |
[Qemu-devel] [PATCH v7 01/12] bitops: Add MAKE_64BIT_MASK macro |
Date: |
Wed, 22 Jun 2016 13:23:47 -0700 |
Add a macro that creates a 64bit value which has length number of ones
shifted across by the value of shift.
Signed-off-by: Alistair Francis <address@hidden>
Reviewed-by: Alex Bennée <address@hidden>
---
V7:
- Fixup commit typo
- Use the method from deposit64()
V5:
- Re-write to a 64-bit mask instead of ONES()
- Re-order this patch in the series
include/qemu/bitops.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 15418a8..98fb005 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -24,6 +24,9 @@
#define BIT_WORD(nr) ((nr) / BITS_PER_LONG)
#define BITS_TO_LONGS(nr) DIV_ROUND_UP(nr, BITS_PER_BYTE * sizeof(long))
+#define MAKE_64BIT_MASK(shift, length) \
+ (((~0ULL) >> (64 - (length))) << (shift))
+
/**
* set_bit - Set a bit in memory
* @nr: the bit to set
--
2.7.4
[Qemu-devel] [PATCH v7 04/12] register: Define REG and FIELD macros, Alistair Francis, 2016/06/22