[PATCH 1/8] arm64/hwcap: Generate the KERNEL_HWCAP_ definitions for the hwcaps

Mark Brown
2026-03-02T22:59:37Z

Currently for each hwcap we define both the HWCAPn_NAME definition which is
exposed to userspace and a kernel internal KERNEL_HWCAP_NAME definition
which we use internally. This is tedious and repetitive, instead use a
script to generate the KERNEL_HWCAP_ definitions from the UAPI definitions.

No functional changes intended.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
arch/arm64/include/asm/hwcap.h | 120 +---------------------------------
arch/arm64/tools/Makefile | 8 ++-
arch/arm64/tools/gen-kernel-hwcaps.sh | 23 +++++++
3 files changed, 32 insertions(+), 119 deletions(-)

diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h
index 72ea4bda79f3..abe8218b2325 100644
--- a/arch/arm64/include/asm/hwcap.h
+++ b/arch/arm64/include/asm/hwcap.h
@@ -60,126 +60,10 @@
* of KERNEL_HWCAP_{feature}.
*/
#define __khwcap_feature(x) const_ilog2(HWCAP_ ## x)
-#define KERNEL_HWCAP_FP __khwcap_feature(FP)
-#define KERNEL_HWCAP_ASIMD __khwcap_feature(ASIMD)
-#define KERNEL_HWCAP_EVTSTRM __khwcap_feature(EVTSTRM)
-#define KERNEL_HWCAP_AES __khwcap_feature(AES)
-#define KERNEL_HWCAP_PMULL __khwcap_feature(PMULL)
-#define KERNEL_HWCAP_SHA1 __khwcap_feature(SHA1)
-#define KERNEL_HWCAP_SHA2 __khwcap_feature(SHA2)
-#define KERNEL_HWCAP_CRC32 __khwcap_feature(CRC32)
-#define KERNEL_HWCAP_ATOMICS __khwcap_feature(ATOMICS)
-#define KERNEL_HWCAP_FPHP __khwcap_feature(FPHP)
-#define KERNEL_HWCAP_ASIMDHP __khwcap_feature(ASIMDHP)
-#define KERNEL_HWCAP_CPUID __khwcap_feature(CPUID)
-#define KERNEL_HWCAP_ASIMDRDM __khwcap_feature(ASIMDRDM)
-#define KERNEL_HWCAP_JSCVT __khwcap_feature(JSCVT)
-#define KERNEL_HWCAP_FCMA __khwcap_feature(FCMA)
-#define KERNEL_HWCAP_LRCPC __khwcap_feature(LRCPC)
-#define KERNEL_HWCAP_DCPOP __khwcap_feature(DCPOP)
-#define KERNEL_HWCAP_SHA3 __khwcap_feature(SHA3)
-#define KERNEL_HWCAP_SM3 __khwcap_feature(SM3)
-#define KERNEL_HWCAP_SM4 __khwcap_feature(SM4)
-#define KERNEL_HWCAP_ASIMDDP __khwcap_feature(ASIMDDP)
-#define KERNEL_HWCAP_SHA512 __khwcap_feature(SHA512)
-#define KERNEL_HWCAP_SVE __khwcap_feature(SVE)
-#define KERNEL_HWCAP_ASIMDFHM __khwcap_feature(ASIMDFHM)
-#define KERNEL_HWCAP_DIT __khwcap_feature(DIT)
-#define KERNEL_HWCAP_USCAT __khwcap_feature(USCAT)
-#define KERNEL_HWCAP_ILRCPC __khwcap_feature(ILRCPC)
-#define KERNEL_HWCAP_FLAGM __khwcap_feature(FLAGM)
-#define KERNEL_HWCAP_SSBS __khwcap_feature(SSBS)
-#define KERNEL_HWCAP_SB __khwcap_feature(SB)
-#define KERNEL_HWCAP_PACA __khwcap_feature(PACA)
-#define KERNEL_HWCAP_PACG __khwcap_feature(PACG)
-#define KERNEL_HWCAP_GCS __khwcap_feature(GCS)
-#define KERNEL_HWCAP_CMPBR __khwcap_feature(CMPBR)
-#define KERNEL_HWCAP_FPRCVT __khwcap_feature(FPRCVT)
-#define KERNEL_HWCAP_F8MM8 __khwcap_feature(F8MM8)
-#define KERNEL_HWCAP_F8MM4 __khwcap_feature(F8MM4)
-#define KERNEL_HWCAP_SVE_F16MM __khwcap_feature(SVE_F16MM)
-#define KERNEL_HWCAP_SVE_ELTPERM __khwcap_feature(SVE_ELTPERM)
-#define KERNEL_HWCAP_SVE_AES2 __khwcap_feature(SVE_AES2)
-#define KERNEL_HWCAP_SVE_BFSCALE __khwcap_feature(SVE_BFSCALE)
-#define KERNEL_HWCAP_SVE2P2 __khwcap_feature(SVE2P2)
-#define KERNEL_HWCAP_SME2P2 __khwcap_feature(SME2P2)
-#define KERNEL_HWCAP_SME_SBITPERM __khwcap_feature(SME_SBITPERM)
-#define KERNEL_HWCAP_SME_AES __khwcap_feature(SME_AES)
-#define KERNEL_HWCAP_SME_SFEXPA __khwcap_feature(SME_SFEXPA)
-#define KERNEL_HWCAP_SME_STMOP __khwcap_feature(SME_STMOP)
-#define KERNEL_HWCAP_SME_SMOP4 __khwcap_feature(SME_SMOP4)
-
#define __khwcap2_feature(x) (const_ilog2(HWCAP2_ ## x) + 64)
-#define KERNEL_HWCAP_DCPODP __khwcap2_feature(DCPODP)
-#define KERNEL_HWCAP_SVE2 __khwcap2_feature(SVE2)
-#define KERNEL_HWCAP_SVEAES __khwcap2_feature(SVEAES)
-#define KERNEL_HWCAP_SVEPMULL __khwcap2_feature(SVEPMULL)
-#define KERNEL_HWCAP_SVEBITPERM __khwcap2_feature(SVEBITPERM)
-#define KERNEL_HWCAP_SVESHA3 __khwcap2_feature(SVESHA3)
-#define KERNEL_HWCAP_SVESM4 __khwcap2_feature(SVESM4)
-#define KERNEL_HWCAP_FLAGM2 __khwcap2_feature(FLAGM2)
-#define KERNEL_HWCAP_FRINT __khwcap2_feature(FRINT)
-#define KERNEL_HWCAP_SVEI8MM __khwcap2_feature(SVEI8MM)
-#define KERNEL_HWCAP_SVEF32MM __khwcap2_feature(SVEF32MM)
-#define KERNEL_HWCAP_SVEF64MM __khwcap2_feature(SVEF64MM)
-#define KERNEL_HWCAP_SVEBF16 __khwcap2_feature(SVEBF16)
-#define KERNEL_HWCAP_I8MM __khwcap2_feature(I8MM)
-#define KERNEL_HWCAP_BF16 __khwcap2_feature(BF16)
-#define KERNEL_HWCAP_DGH __khwcap2_feature(DGH)
-#define KERNEL_HWCAP_RNG __khwcap2_feature(RNG)
-#define KERNEL_HWCAP_BTI __khwcap2_feature(BTI)
-#define KERNEL_HWCAP_MTE __khwcap2_feature(MTE)
-#define KERNEL_HWCAP_ECV __khwcap2_feature(ECV)
-#define KERNEL_HWCAP_AFP __khwcap2_feature(AFP)
-#define KERNEL_HWCAP_RPRES __khwcap2_feature(RPRES)
-#define KERNEL_HWCAP_MTE3 __khwcap2_feature(MTE3)
-#define KERNEL_HWCAP_SME __khwcap2_feature(SME)
-#define KERNEL_HWCAP_SME_I16I64 __khwcap2_feature(SME_I16I64)
-#define KERNEL_HWCAP_SME_F64F64 __khwcap2_feature(SME_F64F64)
-#define KERNEL_HWCAP_SME_I8I32 __khwcap2_feature(SME_I8I32)
-#define KERNEL_HWCAP_SME_F16F32 __khwcap2_feature(SME_F16F32)
-#define KERNEL_HWCAP_SME_B16F32 __khwcap2_feature(SME_B16F32)
-#define KERNEL_HWCAP_SME_F32F32 __khwcap2_feature(SME_F32F32)
-#define KERNEL_HWCAP_SME_FA64 __khwcap2_feature(SME_FA64)
-#define KERNEL_HWCAP_WFXT __khwcap2_feature(WFXT)
-#define KERNEL_HWCAP_EBF16 __khwcap2_feature(EBF16)
-#define KERNEL_HWCAP_SVE_EBF16 __khwcap2_feature(SVE_EBF16)
-#define KERNEL_HWCAP_CSSC __khwcap2_feature(CSSC)
-#define KERNEL_HWCAP_RPRFM __khwcap2_feature(RPRFM)
-#define KERNEL_HWCAP_SVE2P1 __khwcap2_feature(SVE2P1)
-#define KERNEL_HWCAP_SME2 __khwcap2_feature(SME2)
-#define KERNEL_HWCAP_SME2P1 __khwcap2_feature(SME2P1)
-#define KERNEL_HWCAP_SME_I16I32 __khwcap2_feature(SME_I16I32)
-#define KERNEL_HWCAP_SME_BI32I32 __khwcap2_feature(SME_BI32I32)
-#define KERNEL_HWCAP_SME_B16B16 __khwcap2_feature(SME_B16B16)
-#define KERNEL_HWCAP_SME_F16F16 __khwcap2_feature(SME_F16F16)
-#define KERNEL_HWCAP_MOPS __khwcap2_feature(MOPS)
-#define KERNEL_HWCAP_HBC __khwcap2_feature(HBC)
-#define KERNEL_HWCAP_SVE_B16B16 __khwcap2_feature(SVE_B16B16)
-#define KERNEL_HWCAP_LRCPC3 __khwcap2_feature(LRCPC3)
-#define KERNEL_HWCAP_LSE128 __khwcap2_feature(LSE128)
-#define KERNEL_HWCAP_FPMR __khwcap2_feature(FPMR)
-#define KERNEL_HWCAP_LUT __khwcap2_feature(LUT)
-#define KERNEL_HWCAP_FAMINMAX __khwcap2_feature(FAMINMAX)
-#define KERNEL_HWCAP_F8CVT __khwcap2_feature(F8CVT)
-#define KERNEL_HWCAP_F8FMA __khwcap2_feature(F8FMA)
-#define KERNEL_HWCAP_F8DP4 __khwcap2_feature(F8DP4)
-#define KERNEL_HWCAP_F8DP2 __khwcap2_feature(F8DP2)
-#define KERNEL_HWCAP_F8E4M3 __khwcap2_feature(F8E4M3)
-#define KERNEL_HWCAP_F8E5M2 __khwcap2_feature(F8E5M2)
-#define KERNEL_HWCAP_SME_LUTV2 __khwcap2_feature(SME_LUTV2)
-#define KERNEL_HWCAP_SME_F8F16 __khwcap2_feature(SME_F8F16)
-#define KERNEL_HWCAP_SME_F8F32 __khwcap2_feature(SME_F8F32)
-#define KERNEL_HWCAP_SME_SF8FMA __khwcap2_feature(SME_SF8FMA)
-#define KERNEL_HWCAP_SME_SF8DP4 __khwcap2_feature(SME_SF8DP4)
-#define KERNEL_HWCAP_SME_SF8DP2 __khwcap2_feature(SME_SF8DP2)
-#define KERNEL_HWCAP_POE __khwcap2_feature(POE)
-
#define __khwcap3_feature(x) (const_ilog2(HWCAP3_ ## x) + 128)
-#define KERNEL_HWCAP_MTE_FAR __khwcap3_feature(MTE_FAR)
-#define KERNEL_HWCAP_MTE_STORE_ONLY __khwcap3_feature(MTE_STORE_ONLY)
-#define KERNEL_HWCAP_LSFE __khwcap3_feature(LSFE)
-#define KERNEL_HWCAP_LS64 __khwcap3_feature(LS64)
+
+#include "asm/kernel-hwcap.h"

/*
* This yields a mask that user programs can use to figure out what
diff --git a/arch/arm64/tools/Makefile b/arch/arm64/tools/Makefile
index c2b34e761006..a94b3d9caad6 100644
--- a/arch/arm64/tools/Makefile
+++ b/arch/arm64/tools/Makefile
@@ -3,7 +3,7 @@
gen := arch/$(ARCH)/include/generated
kapi := $(gen)/asm

-kapisyshdr-y := cpucap-defs.h sysreg-defs.h
+kapisyshdr-y := cpucap-defs.h kernel-hwcap.h sysreg-defs.h

kapi-hdrs-y := $(addprefix $(kapi)/, $(kapisyshdr-y))

@@ -18,11 +18,17 @@ kapi: $(kapi-hdrs-y)
quiet_cmd_gen_cpucaps = GEN $@
cmd_gen_cpucaps = mkdir -p $(dir $@); $(AWK) -f $(real-prereqs) > $@

+quiet_cmd_gen_kernel_hwcap = GEN $@
+ cmd_gen_kernel_hwcap = mkdir -p $(dir $@); /bin/sh -e $(real-prereqs) > $@
+
quiet_cmd_gen_sysreg = GEN $@
cmd_gen_sysreg = mkdir -p $(dir $@); $(AWK) -f $(real-prereqs) > $@

$(kapi)/cpucap-defs.h: $(src)/gen-cpucaps.awk $(src)/cpucaps FORCE
$(call if_changed,gen_cpucaps)

+$(kapi)/kernel-hwcap.h: $(src)/gen-kernel-hwcaps.sh $(srctree)/arch/arm64/include/uapi/asm/hwcap.h FORCE
+ $(call if_changed,gen_kernel_hwcap)
+
$(kapi)/sysreg-defs.h: $(src)/gen-sysreg.awk $(src)/sysreg FORCE
$(call if_changed,gen_sysreg)
diff --git a/arch/arm64/tools/gen-kernel-hwcaps.sh b/arch/arm64/tools/gen-kernel-hwcaps.sh
new file mode 100644
index 000000000000..e7cdcf428d91
--- /dev/null
+++ b/arch/arm64/tools/gen-kernel-hwcaps.sh
@@ -0,0 +1,23 @@
+#!/bin/sh -e
+# SPDX-License-Identifier: GPL-2.0
+#
+# gen-kernel-hwcap.sh - Generate kernel internal hwcap.h definitions
+#
+# Copyright 2026 Arm, Ltd.
+
+if [ "$1" = "" ]; then
+ echo "$0: no filename specified"
+ exit 1
+fi
+
+echo "#ifndef __ASM_KERNEL_HWCAPS_H"
+echo "#define __ASM_KERNEL_HWCAPS_H"
+echo ""
+echo "/* Generated file - do not edit */"
+echo ""
+
+grep -E '^#define HWCAP[0-9]*_[A-Z0-9_]+' $1 | \
+ sed 's/.*HWCAP\([0-9]*\)_\([A-Z0-9_]\+\).*/#define KERNEL_HWCAP_\2\t__khwcap\1_feature(\2)/'
+
+echo ""
+echo "#endif /* __ASM_KERNEL_HWCAPS_H */"

--
2.47.3