release/src-rt-6.x.4708/linux/linux-2.6.36/arch/ia64/include/asm/percpu.h

   1 #ifndef _ASM_IA64_PERCPU_H
   2 #define _ASM_IA64_PERCPU_H
   3
   4 /*
   5  * Copyright (C) 2002-2003 Hewlett-Packard Co
   6  *      David Mosberger-Tang <davidm@hpl.hp.com>
   7  */
   8
   9 #define PERCPU_ENOUGH_ROOM PERCPU_PAGE_SIZE
  10
  11 #ifdef __ASSEMBLY__
  12 # define THIS_CPU(var)  (var)  /* use this to mark accesses to per-CPU variables... */
  13 #else /* !__ASSEMBLY__ */
  14
  15
  16 #include <linux/threads.h>
  17
  18 #ifdef CONFIG_SMP
  19
  20 #ifdef HAVE_MODEL_SMALL_ATTRIBUTE
  21 # define PER_CPU_ATTRIBUTES     __attribute__((__model__ (__small__)))
  22 #endif
  23
  24 #define __my_cpu_offset __ia64_per_cpu_var(local_per_cpu_offset)
  25
  26 extern void *per_cpu_init(void);
  27
  28 #else /* ! SMP */
  29
  30 #define per_cpu_init()                          (__phys_per_cpu_start)
  31
  32 #endif  /* SMP */
  33
  34 #define PER_CPU_BASE_SECTION ".data..percpu"
  35
  36 /*
  37  * Be extremely careful when taking the address of this variable!  Due to virtual
  38  * remapping, it is different from the canonical address returned by __get_cpu_var(var)!
  39  * On the positive side, using __ia64_per_cpu_var() instead of __get_cpu_var() is slightly
  40  * more efficient.
  41  */
  42 #define __ia64_per_cpu_var(var) (*({                                    \
  43         __verify_pcpu_ptr(&(var));                                      \
  44         ((typeof(var) __kernel __force *)&(var));                       \
  45 }))
  46
  47 #include <asm-generic/percpu.h>
  48
  49 /* Equal to __per_cpu_offset[smp_processor_id()], but faster to access: */
  50 DECLARE_PER_CPU(unsigned long, local_per_cpu_offset);
  51
  52 #endif /* !__ASSEMBLY__ */
  53
  54 #endif /* _ASM_IA64_PERCPU_H */