[RFC V1 1/7] x86: Probe assembler capabilities for VAES and VPLCMULQDQ support

[Megha Dey]

This is a preparatory patch to introduce the optimized crypto algorithms
using AVX512 instructions which would require VAES and VPLCMULQDQ support.

Check for VAES and VPCLMULQDQ assembler support using AVX512 registers.

Cc: x86@xxxxxxxxxx
Signed-off-by: Megha Dey <megha.dey@xxxxxxxxx>
---
 arch/x86/Kconfig.assembler | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/x86/Kconfig.assembler b/arch/x86/Kconfig.assembler
index 26b8c08..9ea0bc8 100644
--- a/arch/x86/Kconfig.assembler
+++ b/arch/x86/Kconfig.assembler
@@ -1,6 +1,16 @@
 # SPDX-License-Identifier: GPL-2.0
 # Copyright (C) 2020 Jason A. Donenfeld <Jason@xxxxxxxxx>. All Rights Reserved.
 
+config AS_VAES_AVX512
+	def_bool $(as-instr,vaesenc %zmm0$(comma)%zmm1$(comma)%zmm1) && 64BIT
+	help
+	  Supported by binutils >= 2.30 and LLVM integrated assembler
+
+config AS_VPCLMULQDQ
+	def_bool $(as-instr,vpclmulqdq \$0$(comma)%zmm2$(comma)%zmm6$(comma)%zmm4)
+	help
+	  Supported by binutils >= 2.30 and LLVM integrated assembler
+
 config AS_AVX512
 	def_bool $(as-instr,vpmovm2b %k1$(comma)%zmm5)
 	help
-- 
2.7.4