include/asm-sh/atomic-llsc.h

   1 #ifndef __ASM_SH_ATOMIC_LLSC_H
   2 #define __ASM_SH_ATOMIC_LLSC_H
   3
   4 /*
   5  * To get proper branch prediction for the main line, we must branch
   6  * forward to code at the end of this object's .text section, then
   7  * branch back to restart the operation.
   8  */
   9 static inline void atomic_add(int i, atomic_t *v)
  10 {
  11         unsigned long tmp;
  12
  13         __asm__ __volatile__ (
  14 "1:     movli.l @%2, %0         ! atomic_add    \n"
  15 "       add     %1, %0                          \n"
  16 "       movco.l %0, @%2                         \n"
  17 "       bf      1b                              \n"
  18         : "=&z" (tmp)
  19         : "r" (i), "r" (&v->counter)
  20         : "t");
  21 }
  22
  23 static inline void atomic_sub(int i, atomic_t *v)
  24 {
  25         unsigned long tmp;
  26
  27         __asm__ __volatile__ (
  28 "1:     movli.l @%2, %0         ! atomic_sub    \n"
  29 "       sub     %1, %0                          \n"
  30 "       movco.l %0, @%2                         \n"
  31 "       bf      1b                              \n"
  32         : "=&z" (tmp)
  33         : "r" (i), "r" (&v->counter)
  34         : "t");
  35 }
  36
  37 /*
  38  * SH-4A note:
  39  *
  40  * We basically get atomic_xxx_return() for free compared with
  41  * atomic_xxx(). movli.l/movco.l require r0 due to the instruction
  42  * encoding, so the retval is automatically set without having to
  43  * do any special work.
  44  */
  45 static inline int atomic_add_return(int i, atomic_t *v)
  46 {
  47         unsigned long temp;
  48
  49         __asm__ __volatile__ (
  50 "1:     movli.l @%2, %0         ! atomic_add_return     \n"
  51 "       add     %1, %0                                  \n"
  52 "       movco.l %0, @%2                                 \n"
  53 "       bf      1b                                      \n"
  54 "       synco                                           \n"
  55         : "=&z" (temp)
  56         : "r" (i), "r" (&v->counter)
  57         : "t");
  58
  59         return temp;
  60 }
  61
  62 static inline int atomic_sub_return(int i, atomic_t *v)
  63 {
  64         unsigned long temp;
  65
  66         __asm__ __volatile__ (
  67 "1:     movli.l @%2, %0         ! atomic_sub_return     \n"
  68 "       sub     %1, %0                                  \n"
  69 "       movco.l %0, @%2                                 \n"
  70 "       bf      1b                                      \n"
  71 "       synco                                           \n"
  72         : "=&z" (temp)
  73         : "r" (i), "r" (&v->counter)
  74         : "t");
  75
  76         return temp;
  77 }
  78
  79 static inline void atomic_clear_mask(unsigned int mask, atomic_t *v)
  80 {
  81         unsigned long tmp;
  82
  83         __asm__ __volatile__ (
  84 "1:     movli.l @%2, %0         ! atomic_clear_mask     \n"
  85 "       and     %1, %0                                  \n"
  86 "       movco.l %0, @%2                                 \n"
  87 "       bf      1b                                      \n"
  88         : "=&z" (tmp)
  89         : "r" (~mask), "r" (&v->counter)
  90         : "t");
  91 }
  92
  93 static inline void atomic_set_mask(unsigned int mask, atomic_t *v)
  94 {
  95         unsigned long tmp;
  96
  97         __asm__ __volatile__ (
  98 "1:     movli.l @%2, %0         ! atomic_set_mask       \n"
  99 "       or      %1, %0                                  \n"
 100 "       movco.l %0, @%2                                 \n"
 101 "       bf      1b                                      \n"
 102         : "=&z" (tmp)
 103         : "r" (mask), "r" (&v->counter)
 104         : "t");
 105 }
 106
 107 #endif /* __ASM_SH_ATOMIC_LLSC_H */