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Linux/arch/ia64/include/asm/percpu.h

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

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