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AJvYcCUZFPCxMLv5WH0PHd5RESFKu1SntjbBEAYCOsivlwlxSxQmZSc7xO32a9NW4BwYEzB1twj1b5Rx9XH6fSdfsltrjdn/p2WYWeOwmswnxp1swU5ASQM= X-Gm-Message-State: AOJu0Yw8sp9oBp9XghgDIvihWnvBWI6d8j5OX/xLikKWLvEpVQ7z4KWr JEtcFmNN/uRFbNR7G8NPs2WYN4V91lcM+dvI9Q1BncmbwObhieigIwEZSt7N1+A= X-Google-Smtp-Source: AGHT+IF+ykWlXq/2p9fLdxe5qiT+fQJVLXU8yD1cTqgZWIiJ9yzpflW/8jhLl1LVX7Yz7XdGYJsgng== X-Received: by 2002:a17:903:28e:b0:1e0:d6ce:7e16 with SMTP id j14-20020a170903028e00b001e0d6ce7e16mr805365plr.15.1711569721663; Wed, 27 Mar 2024 13:02:01 -0700 (PDT) Received: from sw06.internal.sifive.com ([4.53.31.132]) by smtp.gmail.com with ESMTPSA id u4-20020a170902e5c400b001dd0d0d26a4sm9446459plf.147.2024.03.27.13.02.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Mar 2024 13:02:01 -0700 (PDT) From: Samuel Holland To: Andrew Morton , linux-arm-kernel@lists.infradead.org, x86@kernel.org Cc: linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, Christoph Hellwig , loongarch@lists.linux.dev, amd-gfx@lists.freedesktop.org, Samuel Holland , Russell King Subject: [PATCH v3 02/14] ARM: Implement ARCH_HAS_KERNEL_FPU_SUPPORT Date: Wed, 27 Mar 2024 13:00:33 -0700 Message-ID: <20240327200157.1097089-3-samuel.holland@sifive.com> X-Mailer: git-send-email 2.43.1 In-Reply-To: <20240327200157.1097089-1-samuel.holland@sifive.com> References: <20240327200157.1097089-1-samuel.holland@sifive.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240327_130208_700573_1B74F9A5 X-CRM114-Status: GOOD ( 16.83 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org ARM provides an equivalent to the common kernel-mode FPU API, but in a different header and using different function names. Add a wrapper header, and export CFLAGS adjustments as found in lib/raid6/Makefile. Reviewed-by: Christoph Hellwig Signed-off-by: Samuel Holland --- (no changes since v2) Changes in v2: - Remove file name from header comment arch/arm/Kconfig | 1 + arch/arm/Makefile | 7 +++++++ arch/arm/include/asm/fpu.h | 15 +++++++++++++++ 3 files changed, 23 insertions(+) create mode 100644 arch/arm/include/asm/fpu.h diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index b14aed3a17ab..b1751c2cab87 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -15,6 +15,7 @@ config ARM select ARCH_HAS_FORTIFY_SOURCE select ARCH_HAS_KEEPINITRD select ARCH_HAS_KCOV + select ARCH_HAS_KERNEL_FPU_SUPPORT if KERNEL_MODE_NEON select ARCH_HAS_MEMBARRIER_SYNC_CORE select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE select ARCH_HAS_PTE_SPECIAL if ARM_LPAE diff --git a/arch/arm/Makefile b/arch/arm/Makefile index d82908b1b1bb..71afdd98ddf2 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -130,6 +130,13 @@ endif # Accept old syntax despite ".syntax unified" AFLAGS_NOWARN :=$(call as-option,-Wa$(comma)-mno-warn-deprecated,-Wa$(comma)-W) +# The GCC option -ffreestanding is required in order to compile code containing +# ARM/NEON intrinsics in a non C99-compliant environment (such as the kernel) +CC_FLAGS_FPU := -ffreestanding +# Enable +CC_FLAGS_FPU += -isystem $(shell $(CC) -print-file-name=include) +CC_FLAGS_FPU += -march=armv7-a -mfloat-abi=softfp -mfpu=neon + ifeq ($(CONFIG_THUMB2_KERNEL),y) CFLAGS_ISA :=-Wa,-mimplicit-it=always $(AFLAGS_NOWARN) AFLAGS_ISA :=$(CFLAGS_ISA) -Wa$(comma)-mthumb diff --git a/arch/arm/include/asm/fpu.h b/arch/arm/include/asm/fpu.h new file mode 100644 index 000000000000..2ae50bdce59b --- /dev/null +++ b/arch/arm/include/asm/fpu.h @@ -0,0 +1,15 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2023 SiFive + */ + +#ifndef __ASM_FPU_H +#define __ASM_FPU_H + +#include + +#define kernel_fpu_available() cpu_has_neon() +#define kernel_fpu_begin() kernel_neon_begin() +#define kernel_fpu_end() kernel_neon_end() + +#endif /* ! __ASM_FPU_H */