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ARC: add macro to get CPU id

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ARCNUM [15:8] field in ARC_AUX_IDENTITY register allows us to
uniquely identify each core in a multi-core system.

I.e. with help of this macro each core may get its index in SMP system.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Alexey Brodkin <abrodkin@synopsys.com>
This commit is contained in:
Eugeniy Paltsev 2017-11-28 16:48:40 +03:00 committed by Alexey Brodkin
parent 4e782b5940
commit e59c379720
1 changed files with 3 additions and 0 deletions
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3
arch/arc/include/asm/arcregs.h
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@ -72,6 +72,9 @@
/* gcc builtin sr needs reg param to be long immediate */
#define write_aux_reg(reg_immed, val) \
__builtin_arc_sr((unsigned int)val, reg_immed)
/* ARCNUM [15:8] - field to identify each core in a multi-core system */
#define CPU_ID_GET() ((read_aux_reg(ARC_AUX_IDENTITY) & 0xFF00) >> 8)
#endif /* __ASSEMBLY__ */
#endif /* _ASM_ARC_ARCREGS_H */