arch/score/include/asm/system.h

   1 #ifndef _ASM_SCORE_SYSTEM_H
   2 #define _ASM_SCORE_SYSTEM_H
   3
   4 #include <linux/types.h>
   5 #include <linux/irqflags.h>
   6
   7 struct pt_regs;
   8 struct task_struct;
   9
  10 extern void *resume(void *last, void *next, void *next_ti);
  11
  12 #define switch_to(prev, next, last)                             \
  13 do {                                                            \
  14         (last) = resume(prev, next, task_thread_info(next));    \
  15 } while (0)
  16
  17 #define finish_arch_switch(prev)        do {} while (0)
  18
  19 typedef void (*vi_handler_t)(void);
  20 extern unsigned long arch_align_stack(unsigned long sp);
  21
  22 #define mb()            barrier()
  23 #define rmb()           barrier()
  24 #define wmb()           barrier()
  25 #define smp_mb()        barrier()
  26 #define smp_rmb()       barrier()
  27 #define smp_wmb()       barrier()
  28
  29 #define read_barrier_depends()          do {} while (0)
  30 #define smp_read_barrier_depends()      do {} while (0)
  31
  32 #define set_mb(var, value)              do {var = value; wmb(); } while (0)
  33
  34 #define __HAVE_ARCH_CMPXCHG     1
  35
  36 #include <asm-generic/cmpxchg-local.h>
  37
  38 #ifndef __ASSEMBLY__
  39
  40 struct __xchg_dummy { unsigned long a[100]; };
  41 #define __xg(x) ((struct __xchg_dummy *)(x))
  42
  43 static inline
  44 unsigned long __xchg(volatile unsigned long *m, unsigned long val)
  45 {
  46         unsigned long retval;
  47         unsigned long flags;
  48
  49         local_irq_save(flags);
  50         retval = *m;
  51         *m = val;
  52         local_irq_restore(flags);
  53         return retval;
  54 }
  55
  56 #define xchg(ptr, v)                                            \
  57         ((__typeof__(*(ptr))) __xchg((unsigned long *)(ptr),    \
  58                                         (unsigned long)(v)))
  59
  60 static inline unsigned long __cmpxchg(volatile unsigned long *m,
  61                                 unsigned long old, unsigned long new)
  62 {
  63         unsigned long retval;
  64         unsigned long flags;
  65
  66         local_irq_save(flags);
  67         retval = *m;
  68         if (retval == old)
  69                 *m = new;
  70         local_irq_restore(flags);
  71         return retval;
  72 }
  73
  74 #define cmpxchg(ptr, o, n)                                      \
  75         ((__typeof__(*(ptr))) __cmpxchg((unsigned long *)(ptr), \
  76                                         (unsigned long)(o),     \
  77                                         (unsigned long)(n)))
  78
  79 extern void __die(const char *, struct pt_regs *, const char *,
  80         const char *, unsigned long) __attribute__((noreturn));
  81 extern void __die_if_kernel(const char *, struct pt_regs *, const char *,
  82         const char *, unsigned long);
  83
  84 #define die(msg, regs)                                                  \
  85         __die(msg, regs, __FILE__ ":", __func__, __LINE__)
  86 #define die_if_kernel(msg, regs)                                        \
  87         __die_if_kernel(msg, regs, __FILE__ ":", __func__, __LINE__)
  88
  89 #endif /* !__ASSEMBLY__ */
  90 #endif /* _ASM_SCORE_SYSTEM_H */