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MIPS: detect presence of the FRE & UFR bits

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Detect the presence of the Config5 FRE & UFE bits, as indicated by the
FREP bit in FPIR. Record this as a CPU option bit, and provide a
cpu_has_fre macro to ease checking of that option bit.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>
Cc: linux-mips@linux-mips.org
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: linux-fsdevel@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7678/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Paul Burton 2014-09-11 08:30:18 +01:00 committed by Ralf Baechle
parent 5ff04a8433
commit adac5d535d
3 changed files with 7 additions and 0 deletions
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4
arch/mips/include/asm/cpu-features.h
View File

@ -344,4 +344,8 @@
# define cpu_has_msa 0
#endif
#ifndef cpu_has_fre
# define cpu_has_fre (cpu_data[0].options & MIPS_CPU_FRE)
#endif
#endif /* __ASM_CPU_FEATURES_H */

1
arch/mips/include/asm/cpu.h
View File

@ -368,6 +368,7 @@ enum cpu_type_enum {
#define MIPS_CPU_HTW 0x100000000ull /* CPU support Hardware Page Table Walker */
#define MIPS_CPU_RIXIEX 0x200000000ull /* CPU has unique exception codes for {Read, Execute}-Inhibit exceptions */
#define MIPS_CPU_MAAR 0x400000000ull /* MAAR(I) registers are present */
#define MIPS_CPU_FRE 0x800000000ull /* FRE & UFE bits implemented */
/*
* CPU ASE encodings

2
arch/mips/kernel/cpu-probe.c
View File

@ -1317,6 +1317,8 @@ void cpu_probe(void)
MIPS_CPU_ISA_M64R1 | MIPS_CPU_ISA_M64R2)) {
if (c->fpu_id & MIPS_FPIR_3D)
c->ases |= MIPS_ASE_MIPS3D;
if (c->fpu_id & MIPS_FPIR_FREP)
c->options |= MIPS_CPU_FRE;
}
}