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include/qemu/osdep.h: Add macros for pointer alignment

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

Backports commit 6b587d3cda48e7ba26de8d30bf0d8a7063970715 from qemu
This commit is contained in:
Sergey Fedorov 2018-02-23 20:16:10 -05:00 committed by Lioncash
parent 47eac70cb9
commit 3456f0879e
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1 changed files with 11 additions and 0 deletions
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11
qemu/include/qemu/osdep.h
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@ -147,6 +147,17 @@
/* 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