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

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _ASM_MICROBLAZE_CMPXCHG_H
  3 #define _ASM_MICROBLAZE_CMPXCHG_H
  4 
  5 #include <linux/irqflags.h>
  6 
  7 void __bad_xchg(volatile void *ptr, int size);
  8 
  9 static inline unsigned long __xchg(unsigned long x, volatile void *ptr,
 10                                                                 int size)
 11 {
 12         unsigned long ret;
 13         unsigned long flags;
 14 
 15         switch (size) {
 16         case 1:
 17                 local_irq_save(flags);
 18                 ret = *(volatile unsigned char *)ptr;
 19                 *(volatile unsigned char *)ptr = x;
 20                 local_irq_restore(flags);
 21                 break;
 22 
 23         case 4:
 24                 local_irq_save(flags);
 25                 ret = *(volatile unsigned long *)ptr;
 26                 *(volatile unsigned long *)ptr = x;
 27                 local_irq_restore(flags);
 28                 break;
 29         default:
 30                 __bad_xchg(ptr, size), ret = 0;
 31                 break;
 32         }
 33 
 34         return ret;
 35 }
 36 
 37 #define xchg(ptr, x) \
 38         ((__typeof__(*(ptr))) __xchg((unsigned long)(x), (ptr), sizeof(*(ptr))))
 39 
 40 #include <asm-generic/cmpxchg.h>
 41 #include <asm-generic/cmpxchg-local.h>
 42 
 43 #endif /* _ASM_MICROBLAZE_CMPXCHG_H */
 44 

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