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 #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, unsigned long value)
  25 {
  26 #ifdef LISP_FEATURE_SB_THREAD
  27     u32 eax=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" (eax)
  35              : "r" (value), "m" (*word)
  36              : "memory", "cc");
  37 #else
  38         asm ("xor %0,%0\n\
  39               lock cmpxchg %1,%2"
  40              : "=a" (eax)
  41              : "r" (value), "m" (*word)
  42              : "memory", "cc");
  43 #endif
  44
  45     } while(eax!=0);
  46 #else
  47     *word=value;
  48 #endif
  49 }
  50
  51 static inline void
  52 release_spinlock(volatile lispobj *word)
  53 {
  54     *word=0;
  55 }
  56
  57 #include <stdio.h>
  58
  59 static inline lispobj
  60 swap_lispobjs(volatile lispobj *dest, lispobj value)
  61 {
  62     lispobj old_value;
  63 #if defined(LISP_FEATURE_DARWIN)
  64     asm ("lock/xchg %0,(%1)"
  65          : "=r" (old_value)
  66          : "r" (dest), "0" (value)
  67          : "memory");
  68 #else
  69     asm ("lock xchg %0,(%1)"
  70          : "=r" (old_value)
  71          : "r" (dest), "0" (value)
  72          : "memory");
  73 #endif
  74     return old_value;
  75 }
  76
  77 extern void fast_bzero_detect(void *, size_t);
  78 extern void (*fast_bzero_pointer)(void *, size_t);
  79
  80 #endif /* _X86_ARCH_H */