linux-kernel - [RFC PATCH v5 04/13] riscv: Extending cpufeature.c to detect V-extension

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <4b2a5ec77dd0eee02818abb036518930fed8b105.1590646208.git.greentime.hu@sifive.com>
Date:   Thu, 28 May 2020 14:40:52 +0800
From:   Greentime Hu <greentime.hu@...ive.com>
To:     greentime.hu@...ive.com, guoren@...ux.alibaba.com,
        vincent.chen@...ive.com, paul.walmsley@...ive.com,
        palmerdabbelt@...gle.com, linux-riscv@...ts.infradead.org,
        linux-kernel@...r.kernel.org, oleg@...hat.com
Cc:     Anup Patel <anup@...infault.org>
Subject: [RFC PATCH v5 04/13] riscv: Extending cpufeature.c to detect V-extension

From: Guo Ren <guoren@...ux.alibaba.com>

From: Guo Ren <ren_guo@...ky.com>

Current cpufeature.c doesn't support detecting V-extension, because
"rv64" also contain a 'v' letter and we need to skip it.

Signed-off-by: Guo Ren <guoren@...ux.alibaba.com>
Reviewed-by: Anup Patel <anup@...infault.org>
---
 arch/riscv/include/uapi/asm/hwcap.h | 1 +
 arch/riscv/kernel/cpufeature.c      | 4 +++-
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/include/uapi/asm/hwcap.h b/arch/riscv/include/uapi/asm/hwcap.h
index dee98ee28318..a913e9a38819 100644
--- a/arch/riscv/include/uapi/asm/hwcap.h
+++ b/arch/riscv/include/uapi/asm/hwcap.h
@@ -21,5 +21,6 @@
 #define COMPAT_HWCAP_ISA_F	(1 << ('F' - 'A'))
 #define COMPAT_HWCAP_ISA_D	(1 << ('D' - 'A'))
 #define COMPAT_HWCAP_ISA_C	(1 << ('C' - 'A'))
+#define COMPAT_HWCAP_ISA_V	(1 << ('V' - 'A'))
 
 #endif /* _UAPI_ASM_RISCV_HWCAP_H */
diff --git a/arch/riscv/kernel/cpufeature.c b/arch/riscv/kernel/cpufeature.c
index a5ad00043104..c8527d770c98 100644
--- a/arch/riscv/kernel/cpufeature.c
+++ b/arch/riscv/kernel/cpufeature.c
@@ -30,6 +30,7 @@ void riscv_fill_hwcap(void)
 	isa2hwcap['f'] = isa2hwcap['F'] = COMPAT_HWCAP_ISA_F;
 	isa2hwcap['d'] = isa2hwcap['D'] = COMPAT_HWCAP_ISA_D;
 	isa2hwcap['c'] = isa2hwcap['C'] = COMPAT_HWCAP_ISA_C;
+	isa2hwcap['v'] = isa2hwcap['V'] = COMPAT_HWCAP_ISA_V;
 
 	elf_hwcap = 0;
 
@@ -44,7 +45,8 @@ void riscv_fill_hwcap(void)
 			continue;
 		}
 
-		for (i = 0; i < strlen(isa); ++i)
+		/* Skip rv64/rv32 to support v/V:vector */
+		for (i = 4; i < strlen(isa); ++i)
 			this_hwcap |= isa2hwcap[(unsigned char)(isa[i])];
 
 		/*
-- 
2.26.2