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 #ifndef SBCL_GENESIS_CONFIG
   8 #error genesis/config.h (or sbcl.h) must be included before this file
   9 #endif
  10
  11 #ifndef SBCL_GENESIS_CONFIG
  12 #error genesis/config.h (or sbcl.h) must be included before this file
  13 #endif
  14
  15 #define ARCH_HAS_STACK_POINTER
  16
  17 /* FIXME: Do we also want
  18  *   #define ARCH_HAS_FLOAT_REGISTERS
  19  * here? (The answer wasn't obvious to me when merging the
  20  * architecture-abstracting patches for CSR's SPARC port. -- WHN
  21  * 2002-02-15) */
  22
  23 #ifdef LISP_FEATURE_SB_THREAD
  24
  25 extern never_returns lose(char *fmt, ...);
  26
  27 static inline void
  28 get_spinlock(volatile lispobj *word,long value)
  29 {
  30     u32 eax=0;
  31     if(*word==value)
  32         lose("recursive get_spinlock: 0x%x,%d\n",word,value);
  33     do {
  34         asm ("xor %0,%0\n\
  35               lock cmpxchg %1,%2"
  36              : "=a" (eax)
  37              : "r" (value), "m" (*word)
  38              : "memory", "cc");
  39     } while(eax!=0);
  40 }
  41
  42 static inline void
  43 release_spinlock(volatile lispobj *word)
  44 {
  45     *word=0;
  46 }
  47
  48 #else
  49
  50 static inline void
  51 get_spinlock(lispobj *word, int value)
  52 {
  53     *word = value;
  54 }
  55
  56 static inline void
  57 release_spinlock(lispobj *word) {
  58     *word = 0;
  59 }
  60
  61 #endif /* LISP_FEATURE_SB_THREAD */
  62 #endif /* _X86_ARCH_H */