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 #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 #include "interr.h"
  20
  21 static inline void
  22 get_spinlock(volatile lispobj *word,long value)
  23 {
  24 #ifdef LISP_FEATURE_SB_THREAD
  25     u32 eax=0;
  26     if(*word==value)
  27         lose("recursive get_spinlock: 0x%x,%ld\n",word,value);
  28     do {
  29 #if defined(LISP_FEATURE_DARWIN)
  30         asm ("xor %0,%0;\n\
  31               lock/cmpxchg %1,%2"
  32              : "=a" (eax)
  33              : "r" (value), "m" (*word)
  34              : "memory", "cc");
  35 #else
  36         asm ("xor %0,%0\n\
  37               lock cmpxchg %1,%2"
  38              : "=a" (eax)
  39              : "r" (value), "m" (*word)
  40              : "memory", "cc");
  41 #endif
  42
  43     } while(eax!=0);
  44 #else
  45     *word=value;
  46 #endif
  47 }
  48
  49 static inline void
  50 release_spinlock(volatile lispobj *word)
  51 {
  52     *word=0;
  53 }
  54
  55 #include <stdio.h>
  56
  57 static inline lispobj
  58 swap_lispobjs(volatile lispobj *dest, lispobj value)
  59 {
  60     lispobj old_value;
  61 #if defined(LISP_FEATURE_DARWIN)
  62     asm ("lock/xchg %0,(%1)"
  63          : "=r" (old_value)
  64          : "r" (dest), "0" (value)
  65          : "memory");
  66 #else
  67     asm ("lock xchg %0,(%1)"
  68          : "=r" (old_value)
  69          : "r" (dest), "0" (value)
  70          : "memory");
  71 #endif
  72     return old_value;
  73 }
  74
  75 extern void fast_bzero_detect(void *, size_t);
  76 extern void (*fast_bzero_pointer)(void *, size_t);
  77
  78 #endif /* _X86_ARCH_H */