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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/arm64/include/uapi/asm/sve_context.h
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/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */

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/* Copyright (C) 2017-2018 ARM Limited */

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/*

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 * For use by other UAPI headers only.

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 * Do not make direct use of header or its definitions.

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 */

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#ifndef _UAPI__ASM_SVE_CONTEXT_H

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#define _UAPI__ASM_SVE_CONTEXT_H

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#include <linux/types.h>

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#define __SVE_VQ_BYTES		16	/* number of bytes per quadword */

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/*

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 * Yes, __SVE_VQ_MAX is 512 QUADWORDS.

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 *

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 * To help ensure forward portability, this is much larger than the

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 * current maximum value defined by the SVE architecture.  While arrays

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 * or static allocations can be sized based on this value, watch out!

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 * It will waste a surprisingly large amount of memory.

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 *

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 * Dynamic sizing based on the actual runtime vector length is likely to

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 * be preferable for most purposes.

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 */

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#define __SVE_VQ_MIN		1

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#define __SVE_VQ_MAX		512

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#define __SVE_VL_MIN		(__SVE_VQ_MIN * __SVE_VQ_BYTES)

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#define __SVE_VL_MAX		(__SVE_VQ_MAX * __SVE_VQ_BYTES)

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#define __SVE_NUM_ZREGS		32

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#define __SVE_NUM_PREGS		16

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#define __sve_vl_valid(vl)			\

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	((vl) % __SVE_VQ_BYTES == 0 &&		\

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	 (vl) >= __SVE_VL_MIN &&		\

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	 (vl) <= __SVE_VL_MAX)

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#define __sve_vq_from_vl(vl)	((vl) / __SVE_VQ_BYTES)

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#define __sve_vl_from_vq(vq)	((vq) * __SVE_VQ_BYTES)

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#define __SVE_ZREG_SIZE(vq)	((__u32)(vq) * __SVE_VQ_BYTES)

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#define __SVE_PREG_SIZE(vq)	((__u32)(vq) * (__SVE_VQ_BYTES / 8))

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#define __SVE_FFR_SIZE(vq)	__SVE_PREG_SIZE(vq)

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#define __SVE_ZREGS_OFFSET	0

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#define __SVE_ZREG_OFFSET(vq, n) \

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	(__SVE_ZREGS_OFFSET + __SVE_ZREG_SIZE(vq) * (n))

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#define __SVE_ZREGS_SIZE(vq) \

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	(__SVE_ZREG_OFFSET(vq, __SVE_NUM_ZREGS) - __SVE_ZREGS_OFFSET)

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#define __SVE_PREGS_OFFSET(vq) \

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	(__SVE_ZREGS_OFFSET + __SVE_ZREGS_SIZE(vq))

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#define __SVE_PREG_OFFSET(vq, n) \

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	(__SVE_PREGS_OFFSET(vq) + __SVE_PREG_SIZE(vq) * (n))

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#define __SVE_PREGS_SIZE(vq) \

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	(__SVE_PREG_OFFSET(vq, __SVE_NUM_PREGS) - __SVE_PREGS_OFFSET(vq))

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#define __SVE_FFR_OFFSET(vq) \

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	(__SVE_PREGS_OFFSET(vq) + __SVE_PREGS_SIZE(vq))

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#endif /* ! _UAPI__ASM_SVE_CONTEXT_H */

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