From: Jiaxun Yang <jiaxun.yang@flygoat.com>
To: linux-mips@vger.kernel.org
Cc: "Jiaxun Yang" <jiaxun.yang@flygoat.com>,
"Thomas Bogendoerfer" <tsbogend@alpha.franken.de>,
"Paul Burton" <paulburton@kernel.org>,
"Huacai Chen" <chenhc@lemote.com>,
"Serge Semin" <Sergey.Semin@baikalelectronics.ru>,
"Zhou Yanjie" <zhouyanjie@zoho.com>,
"周琰杰 (Zhou Yanjie)" <zhouyanjie@wanyeetech.com>,
"Liangliang Huang" <huanglllzu@gmail.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH] MIPS: Provide Kconfig option for default IEEE754 conformance mode
Date: Fri, 31 Jul 2020 12:10:16 +0800 [thread overview]
Message-ID: <20200731041018.1381642-1-jiaxun.yang@flygoat.com> (raw)
Requested by downstream distros, a Kconfig option for default
IEEE754 conformance mode allows them to set their mode to
relaxed by default.
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
---
arch/mips/Kconfig | 21 +++++++++++++++++++++
arch/mips/kernel/cpu-probe.c | 12 +++++++++++-
2 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/arch/mips/Kconfig b/arch/mips/Kconfig
index f6bb446d30f0..ef5b2a177b1b 100644
--- a/arch/mips/Kconfig
+++ b/arch/mips/Kconfig
@@ -2877,6 +2877,27 @@ config MIPS_NR_CPU_NR_MAP
default 1024 if MIPS_NR_CPU_NR_MAP_1024
default NR_CPUS if !MIPS_NR_CPU_NR_MAP_1024
+choice
+ prompt "Default IEEE Std 754 conformance mode"
+ default IEEE754_DEFAULT_STRICT
+ help
+ Default IEEE Std 754 conformance mode, see ieee754= kernel parameter
+ for detail.
+
+ config IEEE754_DEFAULT_STRICT
+ bool "Strict"
+
+ config IEEE754_DEFAULT_LEGACY
+ bool "Legacy"
+
+ config IEEE754_DEFAULT_STD2008
+ bool "2008"
+
+ config IEEE754_DEFAULT_RELAXED
+ bool "Relaxed"
+
+endchoice
+
#
# Timer Interrupt Frequency Configuration
#
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index d9e8d39a7289..03adeed58efb 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -157,7 +157,17 @@ static void cpu_set_fpu_2008(struct cpuinfo_mips *c)
* IEEE 754 conformance mode to use. Affects the NaN encoding and the
* ABS.fmt/NEG.fmt execution mode.
*/
-static enum { STRICT, LEGACY, STD2008, RELAXED } ieee754 = STRICT;
+enum ieee754_mode { STRICT, LEGACY, STD2008, RELAXED };
+
+#if defined(CONFIG_IEEE754_DEFAULT_STRICT)
+static enum ieee754_mode ieee754 = STRICT;
+#elif defined(CONFIG_IEEE754_DEFAULT_LEGACY)
+static enum ieee754_mode ieee754 = LEGACY;
+#elif defined(CONFIG_IEEE754_DEFAULT_STD2008)
+static enum ieee754_mode ieee754 = STD2008;
+#elif defined(CONFIG_IEEE754_DEFAULT_RELAXED)
+static enum ieee754_mode ieee754 = RELAXED;
+#endif
/*
* Set the IEEE 754 NaN encodings and the ABS.fmt/NEG.fmt execution modes
--
2.28.0
next reply other threads:[~2020-07-31 4:11 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-31 4:10 Jiaxun Yang [this message]
2020-07-31 6:17 ` [PATCH] MIPS: Provide Kconfig option for default IEEE754 conformance mode Serge Semin
2020-07-31 6:54 ` Huacai Chen
2020-08-02 21:46 ` Maciej W. Rozycki
2020-08-03 9:01 ` Jiaxun Yang
2020-08-05 19:30 ` Maciej W. Rozycki
2020-08-05 20:49 ` Zhou Yanjie
2020-07-31 8:33 ` WANG Xuerui
2020-07-31 4:11 Jiaxun Yang
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