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 #include "interr.h"                     /* for declaration of lose() */
  13
  14 #define ARCH_HAS_STACK_POINTER
  15
  16 /* FIXME: Do we also want
  17  *   #define ARCH_HAS_FLOAT_REGISTERS
  18  * here? (The answer wasn't obvious to me when merging the
  19  * architecture-abstracting patches for CSR's SPARC port. -- WHN 2002-02-15) */
  20
  21 #include "interr.h"
  22
  23 static inline void
  24 get_spinlock(volatile lispobj *word,long value)
  25 {
  26 #ifdef LISP_FEATURE_SB_THREAD
  27     u64 rax=0;
  28     if(*word==value)
  29         lose("recursive get_spinlock: 0x%x,%ld\n",word,value);
  30     do {
  31 #if defined(LISP_FEATURE_DARWIN)
  32         asm ("xor %0,%0\n\
  33               lock/cmpxchg %1,%2"
  34              : "=a" (rax)
  35              : "r" (value), "m" (*word)
  36              : "memory", "cc");
  37 #else
  38         asm ("xor %0,%0\n\
  39               lock cmpxchg %1,%2"
  40              : "=a" (rax)
  41              : "r" (value), "m" (*word)
  42              : "memory", "cc");
  43 #endif
  44     } while(rax!=0);
  45 #else
  46     *word=value;
  47 #endif
  48 }
  49
  50 static inline void
  51 release_spinlock(volatile lispobj *word)
  52 {
  53     *word=0;
  54 }
  55
  56 static inline lispobj
  57 swap_lispobjs(volatile lispobj *dest, lispobj value)
  58 {
  59     lispobj old_value;
  60     asm ("lock xchg %0,(%1)"
  61          : "=r" (old_value)
  62          : "r" (dest), "0" (value)
  63          : "memory");
  64     return old_value;
  65 }
  66
  67 #endif /* _X86_64_ARCH_H */