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 #define per_cpu_offset(x) (__per_cpu_offset(x))
  18
  19 /* Separate out the type, so (int[3], foo) works. */
  20 #define DEFINE_PER_CPU(type, name) \
  21     __attribute__((__section__(".data.percpu"))) __typeof__(type) per_cpu__##name
  22
  23 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)               \
  24     __attribute__((__section__(".data.percpu.shared_aligned"))) \
  25     __typeof__(type) per_cpu__##name                            \
  26     ____cacheline_aligned_in_smp
  27
  28 /* var is in discarded region: offset to particular copy we want */
  29 #define per_cpu(var, cpu) (*RELOC_HIDE(&per_cpu__##var, __per_cpu_offset(cpu)))
  30 #define __get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, __my_cpu_offset()))
  31 #define __raw_get_cpu_var(var) (*RELOC_HIDE(&per_cpu__##var, local_paca->data_offset))
  32
  33 /* A macro to avoid #include hell... */
  34 #define percpu_modcopy(pcpudst, src, size)                      \
  35 do {                                                            \
  36         unsigned int __i;                                       \
  37         for_each_possible_cpu(__i)                              \
  38                 memcpy((pcpudst)+__per_cpu_offset(__i),         \
  39                        (src), (size));                          \
  40 } while (0)
  41
  42 extern void setup_per_cpu_areas(void);
  43
  44 #else /* ! SMP */
  45
  46 #define DEFINE_PER_CPU(type, name) \
  47     __typeof__(type) per_cpu__##name
  48 #define DEFINE_PER_CPU_SHARED_ALIGNED(type, name)       \
  49     DEFINE_PER_CPU(type, name)
  50
  51 #define per_cpu(var, cpu)                       (*((void)(cpu), &per_cpu__##var))
  52 #define __get_cpu_var(var)                      per_cpu__##var
  53 #define __raw_get_cpu_var(var)                  per_cpu__##var
  54
  55 #endif  /* SMP */
  56
  57 #define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
  58
  59 #define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
  60 #define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
  61
  62 #else
  63 #include <asm-generic/percpu.h>
  64 #endif
  65
  66 #endif /* _ASM_POWERPC_PERCPU_H_ */