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 /*
   8  * s390 uses its own implementation for per cpu data, the offset of
   9  * the cpu local data area is cached in the cpu's lowcore memory.
  10  * For 64 bit module code s390 forces the use of a GOT slot for the
  11  * address of the per cpu variable. This is needed because the module
  12  * may be more than 4G above the per cpu area.
  13  */
  14 #if defined(__s390x__) && defined(MODULE)
  15
  16 #define SHIFT_PERCPU_PTR(ptr,offset) (({                        \
  17         extern int simple_identifier_##var(void);       \
  18         unsigned long *__ptr;                           \
  19         asm ( "larl %0, %1@GOTENT"              \
  20             : "=a" (__ptr) : "X" (ptr) );               \
  21         (typeof(ptr))((*__ptr) + (offset));     }))
  22
  23 #else
  24
  25 #define SHIFT_PERCPU_PTR(ptr, offset) (({                               \
  26         extern int simple_identifier_##var(void);               \
  27         unsigned long __ptr;                                    \
  28         asm ( "" : "=a" (__ptr) : "0" (ptr) );                  \
  29         (typeof(ptr)) (__ptr + (offset)); }))
  30
  31 #endif
  32
  33 #define __my_cpu_offset S390_lowcore.percpu_offset
  34
  35 #include <asm-generic/percpu.h>
  36
  37 #endif /* __ARCH_S390_PERCPU__ */