1 files changed, 1 insertions, 288 deletions

diff --git a/include/asm-i386/system.h b/include/asm-i386/system.h
index a4ed087ac0ae..94ed3686a5f3 100644
--- a/include/asm-i386/system.h
+++ b/include/asm-i386/system.h
@@ -4,7 +4,7 @@
 #include <linux/kernel.h>
 #include <asm/segment.h>
 #include <asm/cpufeature.h>
-#include <linux/bitops.h> /* for LOCK_PREFIX */
+#include <asm/cmpxchg.h>
 
 #ifdef __KERNEL__
 
@@ -195,293 +195,6 @@ static inline unsigned long get_limit(unsigned long segment)
 
 #define nop() __asm__ __volatile__ ("nop")
 
-#define xchg(ptr,v) ((__typeof__(*(ptr)))__xchg((unsigned long)(v),(ptr),sizeof(*(ptr))))
-
-struct __xchg_dummy { unsigned long a[100]; };
-#define __xg(x) ((struct __xchg_dummy *)(x))
-
-
-#ifdef CONFIG_X86_CMPXCHG64
-
-/*
- * The semantics of XCHGCMP8B are a bit strange, this is why
- * there is a loop and the loading of %%eax and %%edx has to
- * be inside. This inlines well in most cases, the cached
- * cost is around ~38 cycles. (in the future we might want
- * to do an SIMD/3DNOW!/MMX/FPU 64-bit store here, but that
- * might have an implicit FPU-save as a cost, so it's not
- * clear which path to go.)
- *
- * cmpxchg8b must be used with the lock prefix here to allow
- * the instruction to be executed atomically, see page 3-102
- * of the instruction set reference 24319102.pdf. We need
- * the reader side to see the coherent 64bit value.
- */
-static inline void __set_64bit (unsigned long long * ptr,
-                unsigned int low, unsigned int high)
-{
-        __asm__ __volatile__ (
-                "\n1:\t"
-                "movl (%0), %%eax\n\t"
-                "movl 4(%0), %%edx\n\t"
-                "lock cmpxchg8b (%0)\n\t"
-                "jnz 1b"
-                : /* no outputs */
-                :       "D"(ptr),
-                        "b"(low),
-                        "c"(high)
-                :       "ax","dx","memory");
-}
-
-static inline void __set_64bit_constant (unsigned long long *ptr,
-                                                 unsigned long long value)
-{
-        __set_64bit(ptr,(unsigned int)(value), (unsigned int)((value)>>32ULL));
-}
-#define ll_low(x)       *(((unsigned int*)&(x))+0)
-#define ll_high(x)      *(((unsigned int*)&(x))+1)
-
-static inline void __set_64bit_var (unsigned long long *ptr,
-                         unsigned long long value)
-{
-        __set_64bit(ptr,ll_low(value), ll_high(value));
-}
-
-#define set_64bit(ptr,value) \
-(__builtin_constant_p(value) ? \
- __set_64bit_constant(ptr, value) : \
- __set_64bit_var(ptr, value) )
-
-#define _set_64bit(ptr,value) \
-(__builtin_constant_p(value) ? \
- __set_64bit(ptr, (unsigned int)(value), (unsigned int)((value)>>32ULL) ) : \
- __set_64bit(ptr, ll_low(value), ll_high(value)) )
-
-#endif
-
-/*
- * Note: no "lock" prefix even on SMP: xchg always implies lock anyway
- * Note 2: xchg has side effect, so that attribute volatile is necessary,
- *        but generally the primitive is invalid, *ptr is output argument. --ANK
- */
-static inline unsigned long __xchg(unsigned long x, volatile void * ptr, int size)
-{
-        switch (size) {
-                case 1:
-                        __asm__ __volatile__("xchgb %b0,%1"
-                                :"=q" (x)
-                                :"m" (*__xg(ptr)), "0" (x)
-                                :"memory");
-                        break;
-                case 2:
-                        __asm__ __volatile__("xchgw %w0,%1"
-                                :"=r" (x)
-                                :"m" (*__xg(ptr)), "0" (x)
-                                :"memory");
-                        break;
-                case 4:
-                        __asm__ __volatile__("xchgl %0,%1"
-                                :"=r" (x)
-                                :"m" (*__xg(ptr)), "0" (x)
-                                :"memory");
-                        break;
-        }
-        return x;
-}
-
-/*
- * Atomic compare and exchange.  Compare OLD with MEM, if identical,
- * store NEW in MEM.  Return the initial value in MEM.  Success is
- * indicated by comparing RETURN with OLD.
- */
-
-#ifdef CONFIG_X86_CMPXCHG
-#define __HAVE_ARCH_CMPXCHG 1
-#define cmpxchg(ptr,o,n)\
-        ((__typeof__(*(ptr)))__cmpxchg((ptr),(unsigned long)(o),\
-                                        (unsigned long)(n),sizeof(*(ptr))))
-#define sync_cmpxchg(ptr,o,n)\
-        ((__typeof__(*(ptr)))__sync_cmpxchg((ptr),(unsigned long)(o),\
-                                        (unsigned long)(n),sizeof(*(ptr))))
-#define cmpxchg_local(ptr,o,n)\
-        ((__typeof__(*(ptr)))__cmpxchg_local((ptr),(unsigned long)(o),\
-                                        (unsigned long)(n),sizeof(*(ptr))))
-#endif
-
-static inline unsigned long __cmpxchg(volatile void *ptr, unsigned long old,
-                                      unsigned long new, int size)
-{
-        unsigned long prev;
-        switch (size) {
-        case 1:
-                __asm__ __volatile__(LOCK_PREFIX "cmpxchgb %b1,%2"
-                                     : "=a"(prev)
-                                     : "q"(new), "m"(*__xg(ptr)), "0"(old)
-                                     : "memory");
-                return prev;
-        case 2:
-                __asm__ __volatile__(LOCK_PREFIX "cmpxchgw %w1,%2"
-                                     : "=a"(prev)
-                                     : "r"(new), "m"(*__xg(ptr)), "0"(old)
-                                     : "memory");
-                return prev;
-        case 4:
-                __asm__ __volatile__(LOCK_PREFIX "cmpxchgl %1,%2"
-                                     : "=a"(prev)
-                                     : "r"(new), "m"(*__xg(ptr)), "0"(old)
-                                     : "memory");
-                return prev;
-        }
-        return old;
-}
-
-/*
- * Always use locked operations when touching memory shared with a
- * hypervisor, since the system may be SMP even if the guest kernel
- * isn't.
- */
-static inline unsigned long __sync_cmpxchg(volatile void *ptr,
-                                            unsigned long old,
-                                            unsigned long new, int size)
-{
-        unsigned long prev;
-        switch (size) {
-        case 1:
-                __asm__ __volatile__("lock; cmpxchgb %b1,%2"
-                                     : "=a"(prev)
-                                     : "q"(new), "m"(*__xg(ptr)), "0"(old)
-                                     : "memory");
-                return prev;
-        case 2:
-                __asm__ __volatile__("lock; cmpxchgw %w1,%2"
-                                     : "=a"(prev)
-                                     : "r"(new), "m"(*__xg(ptr)), "0"(old)
-                                     : "memory");
-                return prev;
-        case 4:
-                __asm__ __volatile__("lock; cmpxchgl %1,%2"
-                                     : "=a"(prev)
-                                     : "r"(new), "m"(*__xg(ptr)), "0"(old)
-                                     : "memory");
-                return prev;
-        }
-        return old;
-}
-
-static inline unsigned long __cmpxchg_local(volatile void *ptr,
-                        unsigned long old, unsigned long new, int size)
-{
-        unsigned long prev;
-        switch (size) {
-        case 1:
-                __asm__ __volatile__("cmpxchgb %b1,%2"
-                                     : "=a"(prev)
-                                     : "q"(new), "m"(*__xg(ptr)), "0"(old)
-                                     : "memory");
-                return prev;
-        case 2:
-                __asm__ __volatile__("cmpxchgw %w1,%2"
-                                     : "=a"(prev)
-                                     : "r"(new), "m"(*__xg(ptr)), "0"(old)
-                                     : "memory");
-                return prev;
-        case 4:
-                __asm__ __volatile__("cmpxchgl %1,%2"
-                                     : "=a"(prev)
-                                     : "r"(new), "m"(*__xg(ptr)), "0"(old)
-                                     : "memory");
-                return prev;
-        }
-        return old;
-}
-
-#ifndef CONFIG_X86_CMPXCHG
-/*
- * Building a kernel capable running on 80386. It may be necessary to
- * simulate the cmpxchg on the 80386 CPU. For that purpose we define
- * a function for each of the sizes we support.
- */
-
-extern unsigned long cmpxchg_386_u8(volatile void *, u8, u8);
-extern unsigned long cmpxchg_386_u16(volatile void *, u16, u16);
-extern unsigned long cmpxchg_386_u32(volatile void *, u32, u32);
-
-static inline unsigned long cmpxchg_386(volatile void *ptr, unsigned long old,
-                                      unsigned long new, int size)
-{
-        switch (size) {
-        case 1:
-                return cmpxchg_386_u8(ptr, old, new);
-        case 2:
-                return cmpxchg_386_u16(ptr, old, new);
-        case 4:
-                return cmpxchg_386_u32(ptr, old, new);
-        }
-        return old;
-}
-
-#define cmpxchg(ptr,o,n)                                                \
-({                                                                      \
-        __typeof__(*(ptr)) __ret;                                       \
-        if (likely(boot_cpu_data.x86 > 3))                              \
-                __ret = __cmpxchg((ptr), (unsigned long)(o),            \
-                                        (unsigned long)(n), sizeof(*(ptr))); \
-        else                                                            \
-                __ret = cmpxchg_386((ptr), (unsigned long)(o),          \
-                                        (unsigned long)(n), sizeof(*(ptr))); \
-        __ret;                                                          \
-})
-#define cmpxchg_local(ptr,o,n)                                          \
-({                                                                      \
-        __typeof__(*(ptr)) __ret;                                       \
-        if (likely(boot_cpu_data.x86 > 3))                              \
-                __ret = __cmpxchg_local((ptr), (unsigned long)(o),      \
-                                        (unsigned long)(n), sizeof(*(ptr))); \
-        else                                                            \
-                __ret = cmpxchg_386((ptr), (unsigned long)(o),          \
-                                        (unsigned long)(n), sizeof(*(ptr))); \
-        __ret;                                                          \
-})
-#endif
-
-#ifdef CONFIG_X86_CMPXCHG64
-
-static inline unsigned long long __cmpxchg64(volatile void *ptr, unsigned long long old,
-                                      unsigned long long new)
-{
-        unsigned long long prev;
-        __asm__ __volatile__(LOCK_PREFIX "cmpxchg8b %3"
-                             : "=A"(prev)
-                             : "b"((unsigned long)new),
-                               "c"((unsigned long)(new >> 32)),
-                               "m"(*__xg(ptr)),
-                               "0"(old)
-                             : "memory");
-        return prev;
-}
-
-static inline unsigned long long __cmpxchg64_local(volatile void *ptr,
-                        unsigned long long old, unsigned long long new)
-{
-        unsigned long long prev;
-        __asm__ __volatile__("cmpxchg8b %3"
-                             : "=A"(prev)
-                             : "b"((unsigned long)new),
-                               "c"((unsigned long)(new >> 32)),
-                               "m"(*__xg(ptr)),
-                               "0"(old)
-                             : "memory");
-        return prev;
-}
-
-#define cmpxchg64(ptr,o,n)\
-        ((__typeof__(*(ptr)))__cmpxchg64((ptr),(unsigned long long)(o),\
-                                        (unsigned long long)(n)))
-#define cmpxchg64_local(ptr,o,n)\
-        ((__typeof__(*(ptr)))__cmpxchg64_local((ptr),(unsigned long long)(o),\
-                                        (unsigned long long)(n)))
-#endif
-    
 /*
  * Force strict CPU ordering.
  * And yes, this is required on UP too when we're talking