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linux/arch/arm64/include/asm/neon.h

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arm64: add support for kernel mode NEON Add <asm/neon.h> containing kernel_neon_begin/kernel_neon_end function declarations and corresponding definitions in fpsimd.c These are needed to wrap uses of NEON in kernel mode. The names are identical to the ones used in arm/ so code using intrinsics or vectorized by GCC can be shared between arm and arm64. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-07-09 21:18:12 +08:00
/*
* linux/arch/arm64/include/asm/neon.h
*
* Copyright (C) 2013 Linaro Ltd <ard.biesheuvel@linaro.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
arm64: add support for kernel mode NEON in interrupt context This patch modifies kernel_neon_begin() and kernel_neon_end(), so they may be called from any context. To address the case where only a couple of registers are needed, kernel_neon_begin_partial(u32) is introduced which takes as a parameter the number of bottom 'n' NEON q-registers required. To mark the end of such a partial section, the regular kernel_neon_end() should be used. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-02-24 22:26:29 +08:00
#include <linux/types.h>
arm64: Support systems without FP/ASIMD The arm64 kernel assumes that FP/ASIMD units are always present and accesses the FP/ASIMD specific registers unconditionally. This could cause problems when they are absent. This patch adds the support for kernel handling systems without FP/ASIMD by skipping the register access within the kernel. For kvm, we trap the accesses to FP/ASIMD and inject an undefined instruction exception to the VM. The callers of the exported kernel_neon_begin_partial() should make sure that the FP/ASIMD is supported. Cc: Will Deacon <will.deacon@arm.com> Cc: Christoffer Dall <christoffer.dall@linaro.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> [catalin.marinas@arm.com: add comment on the ARM64_HAS_NO_FPSIMD conflict and the new location] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-11-08 21:56:21 +08:00
#include <asm/fpsimd.h>
arm64: add support for kernel mode NEON in interrupt context This patch modifies kernel_neon_begin() and kernel_neon_end(), so they may be called from any context. To address the case where only a couple of registers are needed, kernel_neon_begin_partial(u32) is introduced which takes as a parameter the number of bottom 'n' NEON q-registers required. To mark the end of such a partial section, the regular kernel_neon_end() should be used. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-02-24 22:26:29 +08:00
arm64: Support systems without FP/ASIMD The arm64 kernel assumes that FP/ASIMD units are always present and accesses the FP/ASIMD specific registers unconditionally. This could cause problems when they are absent. This patch adds the support for kernel handling systems without FP/ASIMD by skipping the register access within the kernel. For kvm, we trap the accesses to FP/ASIMD and inject an undefined instruction exception to the VM. The callers of the exported kernel_neon_begin_partial() should make sure that the FP/ASIMD is supported. Cc: Will Deacon <will.deacon@arm.com> Cc: Christoffer Dall <christoffer.dall@linaro.org> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> [catalin.marinas@arm.com: add comment on the ARM64_HAS_NO_FPSIMD conflict and the new location] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2016-11-08 21:56:21 +08:00
#define cpu_has_neon() system_supports_fpsimd()
arm64: add support for kernel mode NEON Add <asm/neon.h> containing kernel_neon_begin/kernel_neon_end function declarations and corresponding definitions in fpsimd.c These are needed to wrap uses of NEON in kernel mode. The names are identical to the ones used in arm/ so code using intrinsics or vectorized by GCC can be shared between arm and arm64. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-07-09 21:18:12 +08:00
arm64: add support for kernel mode NEON in interrupt context This patch modifies kernel_neon_begin() and kernel_neon_end(), so they may be called from any context. To address the case where only a couple of registers are needed, kernel_neon_begin_partial(u32) is introduced which takes as a parameter the number of bottom 'n' NEON q-registers required. To mark the end of such a partial section, the regular kernel_neon_end() should be used. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2014-02-24 22:26:29 +08:00
#define kernel_neon_begin() kernel_neon_begin_partial(32)
void kernel_neon_begin_partial(u32 num_regs);
arm64: add support for kernel mode NEON Add <asm/neon.h> containing kernel_neon_begin/kernel_neon_end function declarations and corresponding definitions in fpsimd.c These are needed to wrap uses of NEON in kernel mode. The names are identical to the ones used in arm/ so code using intrinsics or vectorized by GCC can be shared between arm and arm64. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2013-07-09 21:18:12 +08:00
void kernel_neon_end(void);