Commit 9519ef37 authored by Maciej W. Rozycki's avatar Maciej W. Rozycki Committed by Ralf Baechle
Browse files

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: default avatarMaciej W. Rozycki <macro@imgtec.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Fortune <Matthew.Fortune@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/11475/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 2ed02dd4

arch/mips/include/asm/cpu-features.h

+7 −0
Original line number Diff line number Diff line
@@ -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 */

arch/mips/include/asm/cpu.h

+2 −0
Original line number Diff line number Diff line
@@ -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

arch/mips/kernel/cpu-probe.c

+2 −0
Original line number Diff line number Diff line
@@ -137,6 +137,7 @@ static void cpu_set_fpu_opts(struct cpuinfo_mips *c) 
	}



	cpu_set_fpu_fcsr_mask(c);

	c->options |= MIPS_CPU_NAN_LEGACY;

}



/*
@@ -147,6 +148,7 @@ static void cpu_set_nofpu_opts(struct cpuinfo_mips *c) 
	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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