linux-kernel - [PATCH v6 1/3] RISC-V: expose Zbc as Kconfig option

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Message-Id: <20230709154243.1582671-2-heiko@sntech.de>
Date:   Sun,  9 Jul 2023 17:42:41 +0200
From:   Heiko Stuebner <heiko@...ech.de>
To:     palmer@...belt.com, paul.walmsley@...ive.com
Cc:     aou@...s.berkeley.edu, heiko@...ech.de,
        herbert@...dor.apana.org.au, davem@...emloft.net,
        conor.dooley@...rochip.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-crypto@...r.kernel.org,
        christoph.muellner@...ll.eu, ebiggers@...nel.org,
        Heiko Stuebner <heiko.stuebner@...ll.eu>
Subject: [PATCH v6 1/3] RISC-V: expose Zbc as Kconfig option

From: Heiko Stuebner <heiko.stuebner@...ll.eu>

Similar to Zbb add a Zbc option to allow making further functionality
depend on it.

Signed-off-by: Heiko Stuebner <heiko.stuebner@...ll.eu>
---
 arch/riscv/Kconfig | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index 4c07b9189c86..cb5bd47c50c9 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -531,6 +531,29 @@ config RISCV_ISA_ZBB
 
 	   If you don't know what to do here, say Y.
 
+config TOOLCHAIN_HAS_ZBC
+	bool
+	default y
+	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64ima_zbc)
+	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32ima_zbc)
+	depends on LLD_VERSION >= 150000 || LD_VERSION >= 23900
+	depends on AS_HAS_OPTION_ARCH
+
+config RISCV_ISA_ZBC
+	bool "Zbc extension support for bit manipulation instructions"
+	depends on TOOLCHAIN_HAS_ZBC
+	depends on MMU
+	depends on RISCV_ALTERNATIVE
+	default y
+	help
+	   Adds support to dynamically detect the presence of the ZBC
+	   extension (carry-less multiplication) and enable its usage.
+
+	   The Zbc extension provides instructions clmul, clmulh and clmulr
+	   to accelerate carry-less multiplications.
+
+	   If you don't know what to do here, say Y.
+
 config RISCV_ISA_ZICBOM
 	bool "Zicbom extension support for non-coherent DMA operation"
 	depends on MMU
-- 
2.39.2