diff mbox series

[28/32] bitops: Support 32 and 64 bit mask macro

Message ID 20210419100156.53504-29-yang.zhong@intel.com (mailing list archive)
State New, archived
Headers show
Series Qemu SGX virtualization | expand

Commit Message

Yang Zhong April 19, 2021, 10:01 a.m. UTC
The Qemu should enable bit mask macro like Linux did in the
kernel, the GENMASK(h, l) and GENMASK_ULL(h, l) will set the
bit to 1 from l to h bit in the 32 bit or 64 bit long type.

Signed-off-by: Yang Zhong <yang.zhong@intel.com>
---
 include/qemu/bitops.h | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/include/qemu/bitops.h b/include/qemu/bitops.h
index 3acbf3384c..8678c8dcd5 100644
--- a/include/qemu/bitops.h
+++ b/include/qemu/bitops.h
@@ -18,6 +18,7 @@ 
 
 #define BITS_PER_BYTE           CHAR_BIT
 #define BITS_PER_LONG           (sizeof (unsigned long) * BITS_PER_BYTE)
+#define BITS_PER_LONG_LONG       64
 
 #define BIT(nr)                 (1UL << (nr))
 #define BIT_ULL(nr)             (1ULL << (nr))
@@ -28,6 +29,12 @@ 
 #define MAKE_64BIT_MASK(shift, length) \
     (((~0ULL) >> (64 - (length))) << (shift))
 
+#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))))
+
 /**
  * set_bit - Set a bit in memory
  * @nr: the bit to set