GccInline.c

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UINT32
EFIAPI
InternalSyncIncrement (
  IN      volatile UINT32  *Value
  )
{
  UINT32  Result;
 
  __asm__ __volatile__ (
    "movl    $1, %%eax  \n\t"
    "lock               \n\t"
    "xadd    %%eax, %1  \n\t"
    "inc     %%eax      \n\t"
    : "=&a" (Result),         // %0
      "+m" (*Value)           // %1
    :                         // no inputs that aren't also outputs
    : "memory",
      "cc"
  );
 
  return Result;
}
 
UINT32
EFIAPI
InternalSyncDecrement (
  IN      volatile UINT32  *Value
  )
{
  UINT32  Result;
 
  __asm__ __volatile__ (
    "movl    $-1, %%eax  \n\t"
    "lock                \n\t"
    "xadd    %%eax, %1   \n\t"
    "dec     %%eax       \n\t"
    : "=&a" (Result),          // %0
      "+m" (*Value)            // %1
    :                          // no inputs that aren't also outputs
    : "memory",
      "cc"
  );
 
  return Result;
}
 
UINT16
EFIAPI
InternalSyncCompareExchange16 (
  IN OUT volatile  UINT16  *Value,
  IN      UINT16           CompareValue,
  IN      UINT16           ExchangeValue
  )
{
  __asm__ __volatile__ (
    "lock                 \n\t"
    "cmpxchgw    %2, %1   \n\t"
    : "+a" (CompareValue),      // %0
      "+m" (*Value)             // %1
    : "r"  (ExchangeValue)      // %2
    : "memory",
      "cc"
  );
 
  return CompareValue;
}
 
UINT32
EFIAPI
InternalSyncCompareExchange32 (
  IN OUT volatile  UINT32  *Value,
  IN      UINT32           CompareValue,
  IN      UINT32           ExchangeValue
  )
{
  __asm__ __volatile__ (
    "lock                 \n\t"
    "cmpxchgl    %2, %1   \n\t"
    : "+a" (CompareValue),      // %0
      "+m" (*Value)             // %1
    : "r"  (ExchangeValue)      // %2
    : "memory",
      "cc"
  );
 
  return CompareValue;
}
 
UINT64
EFIAPI
InternalSyncCompareExchange64 (
  IN OUT  volatile UINT64  *Value,
  IN      UINT64           CompareValue,
  IN      UINT64           ExchangeValue
  )
{
  __asm__ __volatile__ (
    "lock                 \n\t"
    "cmpxchgq    %2, %1   \n\t"
    : "+a" (CompareValue),      // %0
      "+m" (*Value)             // %1
    : "r"  (ExchangeValue)      // %2
    : "memory",
      "cc"
  );
 
  return CompareValue;
}