Signed-off-by: Andrea Bastoni <[email protected]>
---
hypervisor/arch/arm-common/include/asm/bitops.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/hypervisor/arch/arm-common/include/asm/bitops.h
b/hypervisor/arch/arm-common/include/asm/bitops.h
index 808c9a0f..e099b560 100644
--- a/hypervisor/arch/arm-common/include/asm/bitops.h
+++ b/hypervisor/arch/arm-common/include/asm/bitops.h
@@ -31,6 +31,7 @@ static inline unsigned long clz(unsigned long word)
/* Returns the position of the least significant 1, MSB=31, LSB=0*/
static inline unsigned long ffsl(unsigned long word)
{
+ // FIXME: the ffsl on x86 isn't robust.
if (!word)
return 0;
asm volatile ("rbit %0, %0" : "+r" (word));
@@ -41,3 +42,12 @@ static inline unsigned long ffzl(unsigned long word)
{
return ffsl(~word);
}
+
+static inline unsigned long msbl(unsigned long word)
+{
+#if BITS_PER_LONG == 64
+ return 63 - clz(word);
+#else
+ return 31 - clz(word);
+#endif
+}
--
2.30.2
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