arch/metag/include/asm/cmpxchg_lnkget.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 #ifndef __ASM_METAG_CMPXCHG_LNKGET_H
   3 #define __ASM_METAG_CMPXCHG_LNKGET_H
   4
   5 static inline unsigned long xchg_u32(volatile u32 *m, unsigned long val)
   6 {
   7         int temp, old;
   8
   9         smp_mb();
  10
  11         asm volatile (
  12                       "1:       LNKGETD %1, [%2]\n"
  13                       " LNKSETD [%2], %3\n"
  14                       " DEFR    %0, TXSTAT\n"
  15                       " ANDT    %0, %0, #HI(0x3f000000)\n"
  16                       " CMPT    %0, #HI(0x02000000)\n"
  17                       " BNZ     1b\n"
  18 #ifdef CONFIG_METAG_LNKGET_AROUND_CACHE
  19                       " DCACHE  [%2], %0\n"
  20 #endif
  21                       : "=&d" (temp), "=&d" (old)
  22                       : "da" (m), "da" (val)
  23                       : "cc"
  24                       );
  25
  26         smp_mb();
  27
  28         return old;
  29 }
  30
  31 static inline unsigned long xchg_u8(volatile u8 *m, unsigned long val)
  32 {
  33         int temp, old;
  34
  35         smp_mb();
  36
  37         asm volatile (
  38                       "1:       LNKGETD %1, [%2]\n"
  39                       " LNKSETD [%2], %3\n"
  40                       " DEFR    %0, TXSTAT\n"
  41                       " ANDT    %0, %0, #HI(0x3f000000)\n"
  42                       " CMPT    %0, #HI(0x02000000)\n"
  43                       " BNZ     1b\n"
  44 #ifdef CONFIG_METAG_LNKGET_AROUND_CACHE
  45                       " DCACHE  [%2], %0\n"
  46 #endif
  47                       : "=&d" (temp), "=&d" (old)
  48                       : "da" (m), "da" (val & 0xff)
  49                       : "cc"
  50                       );
  51
  52         smp_mb();
  53
  54         return old;
  55 }
  56
  57 static inline unsigned long __cmpxchg_u32(volatile int *m, unsigned long old,
  58                                           unsigned long new)
  59 {
  60         __u32 retval, temp;
  61
  62         smp_mb();
  63
  64         asm volatile (
  65                       "1:       LNKGETD %1, [%2]\n"
  66                       " CMP     %1, %3\n"
  67                       " LNKSETDEQ [%2], %4\n"
  68                       " BNE     2f\n"
  69                       " DEFR    %0, TXSTAT\n"
  70                       " ANDT    %0, %0, #HI(0x3f000000)\n"
  71                       " CMPT    %0, #HI(0x02000000)\n"
  72                       " BNZ     1b\n"
  73 #ifdef CONFIG_METAG_LNKGET_AROUND_CACHE
  74                       " DCACHE  [%2], %0\n"
  75 #endif
  76                       "2:\n"
  77                       : "=&d" (temp), "=&d" (retval)
  78                       : "da" (m), "bd" (old), "da" (new)
  79                       : "cc"
  80                       );
  81
  82         smp_mb();
  83
  84         return retval;
  85 }
  86
  87 #endif /* __ASM_METAG_CMPXCHG_LNKGET_H */