linux-kernel - [PATCH 2/8] MIPS: Define the legacy-NaN and 2008-NaN features

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Date:	Fri, 13 Nov 2015 00:46:55 +0000
From:	"Maciej W. Rozycki" <macro@...tec.com>
To:	Ralf Baechle <ralf@...ux-mips.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Fortune <Matthew.Fortune@...tec.com>,
	<linux-mips@...ux-mips.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH 2/8] MIPS: Define the legacy-NaN and 2008-NaN features

Allocate CPU option bits and define macros for the legacy-NaN and 
2008-NaN IEEE Std 754 MIPS architecture features.  Unconditionally mark 
the legacy-NaN feature as present across hardware and emulated 
floating-point configurations.

Signed-off-by: Maciej W. Rozycki <macro@...tec.com>
---
linux-mips-nan-legacy.diff
Index: linux-sfr-test/arch/mips/include/asm/cpu-features.h
===================================================================
--- linux-sfr-test.orig/arch/mips/include/asm/cpu-features.h	2015-10-07 19:33:20.000000000 +0100
+++ linux-sfr-test/arch/mips/include/asm/cpu-features.h	2015-10-07 20:48:14.828556000 +0100
@@ -414,4 +414,11 @@
 # define cpu_has_small_pages	(cpu_data[0].options & MIPS_CPU_SP)
 #endif
 
+#ifndef cpu_has_nan_legacy
+#define cpu_has_nan_legacy	(cpu_data[0].options & MIPS_CPU_NAN_LEGACY)
+#endif
+#ifndef cpu_has_nan_2008
+#define cpu_has_nan_2008	(cpu_data[0].options & MIPS_CPU_NAN_2008)
+#endif
+
 #endif /* __ASM_CPU_FEATURES_H */
Index: linux-sfr-test/arch/mips/include/asm/cpu.h
===================================================================
--- linux-sfr-test.orig/arch/mips/include/asm/cpu.h	2015-10-07 19:33:20.000000000 +0100
+++ linux-sfr-test/arch/mips/include/asm/cpu.h	2015-10-07 20:48:14.831542000 +0100
@@ -386,6 +386,8 @@ enum cpu_type_enum {
 #define MIPS_CPU_BP_GHIST	0x8000000000ull /* R12K+ Branch Prediction Global History */
 #define MIPS_CPU_SP		0x10000000000ull /* Small (1KB) page support */
 #define MIPS_CPU_FTLB		0x20000000000ull /* CPU has Fixed-page-size TLB */
+#define MIPS_CPU_NAN_LEGACY	0x40000000000ull /* Legacy NaN implemented */
+#define MIPS_CPU_NAN_2008	0x80000000000ull /* 2008 NaN implemented */
 
 /*
  * CPU ASE encodings
Index: linux-sfr-test/arch/mips/kernel/cpu-probe.c
===================================================================
--- linux-sfr-test.orig/arch/mips/kernel/cpu-probe.c	2015-10-07 19:33:20.000000000 +0100
+++ linux-sfr-test/arch/mips/kernel/cpu-probe.c	2015-10-07 20:48:14.836528000 +0100
@@ -137,6 +137,7 @@ static void cpu_set_fpu_opts(struct cpui
 	}
 
 	cpu_set_fpu_fcsr_mask(c);
+	c->options |= MIPS_CPU_NAN_LEGACY;
 }
 
 /*
@@ -147,6 +148,7 @@ static void cpu_set_nofpu_opts(struct cp
 	c->options &= ~MIPS_CPU_FPU;
 	c->fpu_msk31 = mips_nofpu_msk31;
 
+	c->options |= MIPS_CPU_NAN_LEGACY;
 	cpu_set_nofpu_id(c);
 }
 
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