1/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
 2/* Copyright (C) 2017-2018 ARM Limited */
 3
 4/*
 5 * For use by other UAPI headers only.
 6 * Do not make direct use of header or its definitions.
 7 */
 8
 9#ifndef __ASM_SVE_CONTEXT_H
10#define __ASM_SVE_CONTEXT_H
11
12#include <linux/types.h>
13
14#define __SVE_VQ_BYTES		16	/* number of bytes per quadword */
15
16/*
17 * Yes, __SVE_VQ_MAX is 512 QUADWORDS.
18 *
19 * To help ensure forward portability, this is much larger than the
20 * current maximum value defined by the SVE architecture.  While arrays
21 * or static allocations can be sized based on this value, watch out!
22 * It will waste a surprisingly large amount of memory.
23 *
24 * Dynamic sizing based on the actual runtime vector length is likely to
25 * be preferable for most purposes.
26 */
27#define __SVE_VQ_MIN		1
28#define __SVE_VQ_MAX		512
29
30#define __SVE_VL_MIN		(__SVE_VQ_MIN * __SVE_VQ_BYTES)
31#define __SVE_VL_MAX		(__SVE_VQ_MAX * __SVE_VQ_BYTES)
32
33#define __SVE_NUM_ZREGS		32
34#define __SVE_NUM_PREGS		16
35
36#define __sve_vl_valid(vl)			\
37	((vl) % __SVE_VQ_BYTES == 0 &&		\
38	 (vl) >= __SVE_VL_MIN &&		\
39	 (vl) <= __SVE_VL_MAX)
40
41#define __sve_vq_from_vl(vl)	((vl) / __SVE_VQ_BYTES)
42#define __sve_vl_from_vq(vq)	((vq) * __SVE_VQ_BYTES)
43
44#define __SVE_ZREG_SIZE(vq)	((__u32)(vq) * __SVE_VQ_BYTES)
45#define __SVE_PREG_SIZE(vq)	((__u32)(vq) * (__SVE_VQ_BYTES / 8))
46#define __SVE_FFR_SIZE(vq)	__SVE_PREG_SIZE(vq)
47
48#define __SVE_ZREGS_OFFSET	0
49#define __SVE_ZREG_OFFSET(vq, n) \
50	(__SVE_ZREGS_OFFSET + __SVE_ZREG_SIZE(vq) * (n))
51#define __SVE_ZREGS_SIZE(vq) \
52	(__SVE_ZREG_OFFSET(vq, __SVE_NUM_ZREGS) - __SVE_ZREGS_OFFSET)
53
54#define __SVE_PREGS_OFFSET(vq) \
55	(__SVE_ZREGS_OFFSET + __SVE_ZREGS_SIZE(vq))
56#define __SVE_PREG_OFFSET(vq, n) \
57	(__SVE_PREGS_OFFSET(vq) + __SVE_PREG_SIZE(vq) * (n))
58#define __SVE_PREGS_SIZE(vq) \
59	(__SVE_PREG_OFFSET(vq, __SVE_NUM_PREGS) - __SVE_PREGS_OFFSET(vq))
60
61#define __SVE_FFR_OFFSET(vq) \
62	(__SVE_PREGS_OFFSET(vq) + __SVE_PREGS_SIZE(vq))
63
64#endif /* ! _UAPI__ASM_SVE_CONTEXT_H */