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ARM: Add a neon-intrinsics.h header like on arm64

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Add a header asm/neon-intrinsics.h similar to the one that arm64 has.
This makes it possible for NEON intrinsics code to be shared seamlessly
between ARM and arm64.

Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://patch.msgid.link/20260422171655.3437334-11-ardb+git@google.com
Signed-off-by: Eric Biggers <ebiggers@kernel.org>
This commit is contained in:
Ard Biesheuvel 2026-04-22 19:16:57 +02:00 committed by Eric Biggers
parent e7ae89a0c9
commit 4156e65624
2 changed files with 63 additions and 1 deletions
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4
Documentation/arch/arm/kernel_mode_neon.rst
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@ -121,4 +121,6 @@ observe the following in addition to the rules above:
* Compile the unit containing the NEON intrinsics with '-ffreestanding' so GCC
uses its builtin version of <stdint.h> (this is a C99 header which the kernel
does not supply);
* Include <arm_neon.h> last, or at least after <linux/types.h>
* Do not include <arm_neon.h> directly: instead, include <asm/neon-intrinsics.h>,
which tweaks some macro definitions so that system headers can be included
safely.

60
arch/arm/include/asm/neon-intrinsics.h Normal file
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@ -0,0 +1,60 @@
/* SPDX-License-Identifier: GPL-2.0-only */
#ifndef __ASM_NEON_INTRINSICS_H
#define __ASM_NEON_INTRINSICS_H
#ifndef __ARM_NEON__
#error You should compile this file with '-march=armv7-a -mfloat-abi=softfp -mfpu=neon'
#endif
#include <asm-generic/int-ll64.h>
/*
* The C99 types uintXX_t that are usually defined in 'stdint.h' are not as
* unambiguous on ARM as you would expect. For the types below, there is a
* difference on ARM between GCC built for bare metal ARM, GCC built for glibc
* and the kernel itself, which results in build errors if you try to build
* with -ffreestanding and include 'stdint.h' (such as when you include
* 'arm_neon.h' in order to use NEON intrinsics)
*
* As the typedefs for these types in 'stdint.h' are based on builtin defines
* supplied by GCC, we can tweak these to align with the kernel's idea of those
* types, so 'linux/types.h' and 'stdint.h' can be safely included from the
* same source file (provided that -ffreestanding is used).
*
* int32_t uint32_t intptr_t uintptr_t
* bare metal GCC long unsigned long int unsigned int
* glibc GCC int unsigned int int unsigned int
* kernel int unsigned int long unsigned long
*/
#ifdef __INT32_TYPE__
#undef __INT32_TYPE__
#define __INT32_TYPE__ int
#endif
#ifdef __UINT32_TYPE__
#undef __UINT32_TYPE__
#define __UINT32_TYPE__ unsigned int
#endif
#ifdef __INTPTR_TYPE__
#undef __INTPTR_TYPE__
#define __INTPTR_TYPE__ long
#endif
#ifdef __UINTPTR_TYPE__
#undef __UINTPTR_TYPE__
#define __UINTPTR_TYPE__ unsigned long
#endif
/*
* genksyms chokes on the ARM NEON instrinsics system header, but we
* don't export anything it defines anyway, so just disregard when
* genksyms execute.
*/
#ifndef __GENKSYMS__
#include <arm_neon.h>
#endif
#endif /* __ASM_NEON_INTRINSICS_H */