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ARC: add macro to get CPU id

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>
Eugeniy Paltsev 6 years ago
parent
commit
e59c379720
1 changed files with 3 additions and 0 deletions
  1. 3 0
      arch/arc/include/asm/arcregs.h

+ 3 - 0
arch/arc/include/asm/arcregs.h

@@ -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 */