src/runtime/x86-arch.h

   1 /* FIXME: Aren't preprocessor symbols with underscore prefixes
   2  * reserved for the system libraries? If so, it would be tidy to
   3  * rename flags like _X86_ARCH_H so their names are in a part of the
   4  * namespace that we control. */
   5 #ifndef _X86_ARCH_H
   6 #define _X86_ARCH_H
   7
   8 #define ARCH_HAS_STACK_POINTER
   9
  10 /* FIXME: Do we also want
  11  *   #define ARCH_HAS_FLOAT_REGISTERS
  12  * here? (The answer wasn't obvious to me when merging the
  13  * architecture-abstracting patches for CSR's SPARC port. -- WHN 2002-02-15) */
  14
  15 static inline void
  16 get_spinlock(lispobj *word,int value)
  17 {
  18     u32 eax=0;
  19     do {
  20         asm ("xor %0,%0\n\
  21               lock cmpxchg %1,%2"
  22              : "=a" (eax)
  23              : "r" (value), "m" (*word)
  24              : "memory", "cc");
  25     } while(eax!=0);
  26 }
  27
  28 static inline void
  29 release_spinlock(lispobj *word)
  30 {
  31     *word=0;
  32 }
  33
  34 #endif /* _X86_ARCH_H */