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- #if defined __pentiumpro__ || defined __pentium4__ || defined __athlon__ || \
- defined __k8__
- # include "i686/pt-machine.h"
- #else
- #ifndef _PT_MACHINE_H
- #define _PT_MACHINE_H 1
- #ifndef __ASSEMBLER__
- #ifndef PT_EI
- # define PT_EI extern inline __attribute__ ((always_inline))
- #endif
- extern long int testandset (int *spinlock);
- extern int __compare_and_swap (long int *p, long int oldval, long int newval);
- #define CURRENT_STACK_FRAME __builtin_frame_address (0)
- PT_EI long int
- testandset (int *spinlock)
- {
- long int ret;
- __asm__ __volatile__(
- "xchgl %0, %1"
- : "=r"(ret), "=m"(*spinlock)
- : "0"(1), "m"(*spinlock)
- : "memory");
- return ret;
- }
- #define HAS_COMPARE_AND_SWAP
- #define TEST_FOR_COMPARE_AND_SWAP
- PT_EI int
- __compare_and_swap (long int *p, long int oldval, long int newval)
- {
- char ret;
- long int readval;
- __asm__ __volatile__ ("lock; cmpxchgl %3, %1; sete %0"
- : "=q" (ret), "=m" (*p), "=a" (readval)
- : "r" (newval), "m" (*p), "a" (oldval)
- : "memory");
- return ret;
- }
- PT_EI int get_eflags (void);
- PT_EI int
- get_eflags (void)
- {
- int res;
- __asm__ __volatile__ ("pushfl; popl %0" : "=r" (res) : );
- return res;
- }
- PT_EI void set_eflags (int newflags);
- PT_EI void
- set_eflags (int newflags)
- {
- __asm__ __volatile__ ("pushl %0; popfl" : : "r" (newflags) : "cc");
- }
- PT_EI int compare_and_swap_is_available (void);
- PT_EI int
- compare_and_swap_is_available (void)
- {
- int oldflags = get_eflags ();
- int changed;
-
- set_eflags (oldflags ^ 0x40000);
-
- changed = (get_eflags () ^ oldflags) & 0x40000;
-
- set_eflags (oldflags);
-
- return changed != 0;
- }
- #endif
- #endif
- #endif
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