x86: move switch_to macro to system.h
[sfrench/cifs-2.6.git] / include / asm-x86 / system_64.h
index 9def35eb75e3f3446c3c7be59143733f36bce0d2..97fa251ccb2b088d055e0332fb97d50e5aeb480d 100644 (file)
@@ -4,49 +4,6 @@
 #include <asm/segment.h>
 #include <asm/cmpxchg.h>
 
-#ifdef __KERNEL__
-
-/* entries in ARCH_DLINFO: */
-#ifdef CONFIG_IA32_EMULATION
-# define AT_VECTOR_SIZE_ARCH 2
-#else
-# define AT_VECTOR_SIZE_ARCH 1
-#endif
-
-#define __SAVE(reg,offset) "movq %%" #reg ",(14-" #offset ")*8(%%rsp)\n\t"
-#define __RESTORE(reg,offset) "movq (14-" #offset ")*8(%%rsp),%%" #reg "\n\t"
-
-/* frame pointer must be last for get_wchan */
-#define SAVE_CONTEXT    "pushf ; pushq %%rbp ; movq %%rsi,%%rbp\n\t"
-#define RESTORE_CONTEXT "movq %%rbp,%%rsi ; popq %%rbp ; popf\t"
-
-#define __EXTRA_CLOBBER  \
-       ,"rcx","rbx","rdx","r8","r9","r10","r11","r12","r13","r14","r15"
-
-/* Save restore flags to clear handle leaking NT */
-#define switch_to(prev,next,last) \
-       asm volatile(SAVE_CONTEXT                                                   \
-                    "movq %%rsp,%P[threadrsp](%[prev])\n\t" /* save RSP */       \
-                    "movq %P[threadrsp](%[next]),%%rsp\n\t" /* restore RSP */    \
-                    "call __switch_to\n\t"                                       \
-                    ".globl thread_return\n"                                   \
-                    "thread_return:\n\t"                                           \
-                    "movq %%gs:%P[pda_pcurrent],%%rsi\n\t"                       \
-                    "movq %P[thread_info](%%rsi),%%r8\n\t"                       \
-                    LOCK_PREFIX "btr  %[tif_fork],%P[ti_flags](%%r8)\n\t"        \
-                    "movq %%rax,%%rdi\n\t"                                       \
-                    "jc   ret_from_fork\n\t"                                     \
-                    RESTORE_CONTEXT                                                \
-                    : "=a" (last)                                                \
-                    : [next] "S" (next), [prev] "D" (prev),                      \
-                      [threadrsp] "i" (offsetof(struct task_struct, thread.sp)), \
-                      [ti_flags] "i" (offsetof(struct thread_info, flags)),\
-                      [tif_fork] "i" (TIF_FORK),                         \
-                      [thread_info] "i" (offsetof(struct task_struct, stack)), \
-                      [pda_pcurrent] "i" (offsetof(struct x8664_pda, pcurrent))   \
-                    : "memory", "cc" __EXTRA_CLOBBER)
-    
-#endif /* __KERNEL__ */
 
 static inline unsigned long read_cr8(void)
 {