[PATCHv4 3/8] asm-generic: introduce be48 unaligned accessors

[Keith Busch]

The NVMe protocol extended the data integrity fields with unaligned
48-bit reference tags. Provide some helper accessors in
preparation for these.

Reviewed-by: Christoph Hellwig <hch@xxxxxx>
Reviewed-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
Reviewed-by: Hannes Reinecke <hare@xxxxxxx>
Reviewed-by: Chaitanya Kulkarni <kch@xxxxxxxxxx>
Acked-by: Arnd Bergmann <arnd@xxxxxxxx>
Signed-off-by: Keith Busch <kbusch@xxxxxxxxxx>
---
 include/asm-generic/unaligned.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h
index 1c4242416c9f..8fc637379899 100644
--- a/include/asm-generic/unaligned.h
+++ b/include/asm-generic/unaligned.h
@@ -126,4 +126,30 @@ static inline void put_unaligned_le24(const u32 val, void *p)
 	__put_unaligned_le24(val, p);
 }
 
+static inline void __put_unaligned_be48(const u64 val, __u8 *p)
+{
+	*p++ = val >> 40;
+	*p++ = val >> 32;
+	*p++ = val >> 24;
+	*p++ = val >> 16;
+	*p++ = val >> 8;
+	*p++ = val;
+}
+
+static inline void put_unaligned_be48(const u64 val, void *p)
+{
+	__put_unaligned_be48(val, p);
+}
+
+static inline u64 __get_unaligned_be48(const u8 *p)
+{
+	return (u64)p[0] << 40 | (u64)p[1] << 32 | p[2] << 24 |
+		p[3] << 16 | p[4] << 8 | p[5];
+}
+
+static inline u64 get_unaligned_be48(const void *p)
+{
+	return __get_unaligned_be48(p);
+}
+
 #endif /* __ASM_GENERIC_UNALIGNED_H */
-- 
2.25.4