LXR linux-bk/include/asm-s390/percpu.h

   1#ifndef __ARCH_S390_PERCPU__
   2#define __ARCH_S390_PERCPU__
   3
   4#include <linux/compiler.h>
   5#include <asm/lowcore.h>
   6
   7#define __GENERIC_PER_CPU
   8
   9/*
  10 * s390 uses its own implementation for per cpu data, the offset of
  11 * the cpu local data area is cached in the cpu's lowcore memory.
  12 * For 64 bit module code s390 forces the use of a GOT slot for the
  13 * address of the per cpu variable. This is needed because the module
  14 * may be more than 4G above the per cpu area.
  15 */
  16#if defined(__s390x__) && defined(MODULE)
  17
  18#define __reloc_hide(var,offset) \
  19  (*({ unsigned long *__ptr; \
  20       asm ( "larl %0,per_cpu__"#var"@GOTENT" \
  21             : "=a" (__ptr) : "X" (per_cpu__##var) ); \
  22       (typeof(&per_cpu__##var))((*__ptr) + (offset)); }))
  23
  24#else
  25
  26#define __reloc_hide(var, offset) \
  27  (*({ unsigned long __ptr; \
  28       asm ( "" : "=a" (__ptr) : "0" (&per_cpu__##var) ); \
  29       (typeof(&per_cpu__##var)) (__ptr + (offset)); }))
  30
  31#endif
  32
  33#ifdef CONFIG_SMP
  34
  35extern unsigned long __per_cpu_offset[NR_CPUS];
  36
  37/* Separate out the type, so (int[3], foo) works. */
  38#define DEFINE_PER_CPU(type, name) \
  39    __attribute__((__section__(".data.percpu"))) \
  40    __typeof__(type) per_cpu__##name
  41
  42#define __get_cpu_var(var) __reloc_hide(var,S390_lowcore.percpu_offset)
  43#define per_cpu(var,cpu) __reloc_hide(var,__per_cpu_offset[cpu])
  44
  45/* A macro to avoid #include hell... */
  46#define percpu_modcopy(pcpudst, src, size)                      \
  47do {                                                            \
  48        unsigned int __i;                                       \
  49        for (__i = 0; __i < NR_CPUS; __i++)                     \
  50                if (cpu_possible(__i))                          \
  51                        memcpy((pcpudst)+__per_cpu_offset[__i], \
  52                               (src), (size));                  \
  53} while (0)
  54
  55#else /* ! SMP */
  56
  57#define DEFINE_PER_CPU(type, name) \
  58    __typeof__(type) per_cpu__##name
  59
  60#define __get_cpu_var(var) __reloc_hide(var,0)
  61#define per_cpu(var,cpu) __reloc_hide(var,0)
  62
  63#endif /* SMP */
  64
  65#define DECLARE_PER_CPU(type, name) extern __typeof__(type) per_cpu__##name
  66
  67#define EXPORT_PER_CPU_SYMBOL(var) EXPORT_SYMBOL(per_cpu__##var)
  68#define EXPORT_PER_CPU_SYMBOL_GPL(var) EXPORT_SYMBOL_GPL(per_cpu__##var)
  69
  70#endif /* __ARCH_S390_PERCPU__ */
  71