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TOMOYO Linux Cross Reference
Linux/arch/unicore32/include/asm/cmpxchg.h

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  1 /*
  2  * Atomics xchg/cmpxchg for PKUnity SoC and UniCore ISA
  3  *
  4  * Copyright (C) 2001-2012 GUAN Xue-tao
  5  *
  6  * This program is free software; you can redistribute it and/or modify
  7  * it under the terms of the GNU General Public License version 2 as
  8  * published by the Free Software Foundation.
  9  */
 10 #ifndef __UNICORE_CMPXCHG_H__
 11 #define __UNICORE_CMPXCHG_H__
 12 
 13 /*
 14  * Generate a link failure on undefined symbol if the pointer points to a value
 15  * of unsupported size.
 16  */
 17 extern void __xchg_bad_pointer(void);
 18 
 19 static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
 20                 int size)
 21 {
 22         unsigned long ret;
 23 
 24         switch (size) {
 25         case 1:
 26                 asm volatile("swapb     %0, %1, [%2]"
 27                         : "=&r" (ret)
 28                         : "r" (x), "r" (ptr)
 29                         : "memory", "cc");
 30                 break;
 31         case 4:
 32                 asm volatile("swapw     %0, %1, [%2]"
 33                         : "=&r" (ret)
 34                         : "r" (x), "r" (ptr)
 35                         : "memory", "cc");
 36                 break;
 37         default:
 38                 __xchg_bad_pointer();
 39         }
 40 
 41         return ret;
 42 }
 43 
 44 #define xchg(ptr, x) \
 45         ((__typeof__(*(ptr)))__xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
 46 
 47 #include <asm-generic/cmpxchg-local.h>
 48 
 49 /*
 50  * cmpxchg_local and cmpxchg64_local are atomic wrt current CPU. Always make
 51  * them available.
 52  */
 53 #define cmpxchg_local(ptr, o, n)                                        \
 54                 ((__typeof__(*(ptr)))__cmpxchg_local_generic((ptr),     \
 55                 (unsigned long)(o), (unsigned long)(n), sizeof(*(ptr))))
 56 #define cmpxchg64_local(ptr, o, n)                                      \
 57                 __cmpxchg64_local_generic((ptr), (o), (n))
 58 
 59 #include <asm-generic/cmpxchg.h>
 60 
 61 #endif /* __UNICORE_CMPXCHG_H__ */
 62 

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