include/asm-powerpc/percpu.h

   1 #ifndef _ASM_POWERPC_PERCPU_H_
   2 #define _ASM_POWERPC_PERCPU_H_
   3 #ifdef __powerpc64__
   4 #include <linux/compiler.h>
   5
   6 /*
   7  * Same as asm-generic/percpu.h, except that we store the per cpu offset
   8  * in the paca. Based on the x86-64 implementation.
   9  */
  10
  11 #ifdef CONFIG_SMP
  12
  13 #include <asm/paca.h>
  14
  15 #define __per_cpu_offset(cpu) (paca[cpu].data_offset)
  16 #define __my_cpu_offset() get_paca()->data_offset
  17
  18 /* Separate out the type, so (int[3], foo) works. */
  19 #define DEFINE_PER_CPU(type, name) \
  20     __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
  21
  22 /* var is in discarded region: offset to particular copy we want */
  23 #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
  24 #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
  25
  26 /* A macro to avoid #include hell... */
  27 #define percpu_modcopy(pcpudst, src, size)                      \
  28 do {                                                            \
  29         unsigned int __i;                                       \
  30         for (__i = 0; __i < NR_CPUS; __i++)                     \
  31                 if (cpu_possible(__i))                          \
  32                         memcpy((pcpudst)+__per_cpu_offset(__i), \
  33                                (src), (size));                  \
  34 } while (0)
  35
  36 extern void setup_per_cpu_areas(void);
  37
  38 #else /* ! SMP */
  39
  40 #define DEFINE_PER_CPU(type, name) \
  41     __typeof__(type) per_cpu__##name
  42
  43 #define per_cpu(var, cpu)                       (*((void)(cpu), &per_cpu__##var))
  44 #define __get_cpu_var(var)                      per_cpu__##var
  45
  46 #endif  /* SMP */
  47
  48 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
  49
  50 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
  51 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
  52
  53 #else
  54 #include <asm-generic/percpu.h>
  55 #endif
  56
  57 #endif /* _ASM_POWERPC_PERCPU_H_ */