kernel/arch/metag/include/asm/cmpxchg_lnkget.h

   1 #ifndef __ASM_METAG_CMPXCHG_LNKGET_H
   2 #define __ASM_METAG_CMPXCHG_LNKGET_H
   3
   4 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
   5 {
   6         int temp, old;
   7
   8         smp_mb();
   9
  10         asm volatile (
  11                       "1:       LNKGETD %1, [%2]\n"
  12                       " LNKSETD [%2], %3\n"
  13                       " DEFR    %0, TXSTAT\n"
  14                       " ANDT    %0, %0, #HI(0x3f000000)\n"
  15                       " CMPT    %0, #HI(0x02000000)\n"
  16                       " BNZ     1b\n"
  17 #ifdef CONFIG_METAG_LNKGET_AROUND_CACHE
  18                       " DCACHE  [%2], %0\n"
  19 #endif
  20                       : "=&d" (temp), "=&d" (old)
  21                       : "da" (m), "da" (val)
  22                       : "cc"
  23                       );
  24
  25         smp_mb();
  26
  27         return old;
  28 }
  29
  30 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
  31 {
  32         int temp, old;
  33
  34         smp_mb();
  35
  36         asm volatile (
  37                       "1:       LNKGETD %1, [%2]\n"
  38                       " LNKSETD [%2], %3\n"
  39                       " DEFR    %0, TXSTAT\n"
  40                       " ANDT    %0, %0, #HI(0x3f000000)\n"
  41                       " CMPT    %0, #HI(0x02000000)\n"
  42                       " BNZ     1b\n"
  43 #ifdef CONFIG_METAG_LNKGET_AROUND_CACHE
  44                       " DCACHE  [%2], %0\n"
  45 #endif
  46                       : "=&d" (temp), "=&d" (old)
  47                       : "da" (m), "da" (val & 0xff)
  48                       : "cc"
  49                       );
  50
  51         smp_mb();
  52
  53         return old;
  54 }
  55
  56 static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
  57                                           unsigned long new)
  58 {
  59         __u32 retval, temp;
  60
  61         smp_mb();
  62
  63         asm volatile (
  64                       "1:       LNKGETD %1, [%2]\n"
  65                       " CMP     %1, %3\n"
  66                       " LNKSETDEQ [%2], %4\n"
  67                       " BNE     2f\n"
  68                       " DEFR    %0, TXSTAT\n"
  69                       " ANDT    %0, %0, #HI(0x3f000000)\n"
  70                       " CMPT    %0, #HI(0x02000000)\n"
  71                       " BNZ     1b\n"
  72 #ifdef CONFIG_METAG_LNKGET_AROUND_CACHE
  73                       " DCACHE  [%2], %0\n"
  74 #endif
  75                       "2:\n"
  76                       : "=&d" (temp), "=&da" (retval)
  77                       : "da" (m), "bd" (old), "da" (new)
  78                       : "cc"
  79                       );
  80
  81         smp_mb();
  82
  83         return retval;
  84 }
  85
  86 #endif /* __ASM_METAG_CMPXCHG_LNKGET_H */