src/runtime/x86-64-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_64_ARCH_H
   6 #define _X86_64_ARCH_H
   7
   8 #ifndef SBCL_GENESIS_CONFIG
   9 #error genesis/config.h (or sbcl.h) must be included before this file
  10 #endif
  11
  12 #define ARCH_HAS_STACK_POINTER
  13
  14 /* FIXME: Do we also want
  15  *   #define ARCH_HAS_FLOAT_REGISTERS
  16  * here? (The answer wasn't obvious to me when merging the
  17  * architecture-abstracting patches for CSR's SPARC port. -- WHN 2002-02-15) */
  18
  19 extern never_returns lose(char *fmt, ...);
  20
  21 static inline void
  22 get_spinlock(volatile lispobj *word,long value)
  23 {
  24 #ifdef LISP_FEATURE_SB_THREAD
  25     u64 rax=0;
  26     if(*word==value)
  27         lose("recursive get_spinlock: 0x%x,%ld\n",word,value);
  28     do {
  29         asm ("xor %0,%0\n\
  30               lock cmpxchg %1,%2"
  31              : "=a" (rax)
  32              : "r" (value), "m" (*word)
  33              : "memory", "cc");
  34     } while(rax!=0);
  35 #else
  36     *word=value;
  37 #endif
  38 }
  39
  40 static inline void
  41 release_spinlock(volatile lispobj *word)
  42 {
  43     *word=0;
  44 }
  45
  46 #endif /* _X86_64_ARCH_H */