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[PULL,03/39] include/qemu/osdep.h: Add macros for pointer alignment

Message ID 1463098420-29113-4-git-send-email-rth@twiddle.net (mailing list archive)
State New, archived
Headers show

Commit Message

Richard Henderson May 13, 2016, 12:13 a.m. UTC 
From: Sergey Fedorov <serge.fdrv@gmail.com>

These macros provide a convenient way to n-byte align pointers up and
down and check if a pointer is n-byte aligned.

Signed-off-by: Sergey Fedorov <serge.fdrv@gmail.com>
Signed-off-by: Sergey Fedorov <sergey.fedorov@linaro.org>
Message-Id: <1461341333-19646-3-git-send-email-sergey.fedorov@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
---
 include/qemu/osdep.h | 11 +++++++++++
 1 file changed, 11 insertions(+)
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Patch

diff --git a/include/qemu/osdep.h b/include/qemu/osdep.h
index e3bc50b..1e3221c 100644
--- a/include/qemu/osdep.h
+++ b/include/qemu/osdep.h
@@ -161,6 +161,17 @@  extern int daemon(int, int);
 /* Check if n is a multiple of m */
 #define QEMU_IS_ALIGNED(n, m) (((n) % (m)) == 0)
 
+/* n-byte align pointer down */
+#define QEMU_ALIGN_PTR_DOWN(p, n) \
+    ((typeof(p))QEMU_ALIGN_DOWN((uintptr_t)(p), (n)))
+
+/* n-byte align pointer up */
+#define QEMU_ALIGN_PTR_UP(p, n) \
+    ((typeof(p))QEMU_ALIGN_UP((uintptr_t)(p), (n)))
+
+/* Check if pointer p is n-bytes aligned */
+#define QEMU_PTR_IS_ALIGNED(p, n) QEMU_IS_ALIGNED((uintptr_t)(p), (n))
+
 #ifndef ROUND_UP
 #define ROUND_UP(n,d) (((n) + (d) - 1) & -(d))
 #endif