x86: move switch_to macro to system.h

This patch moves the switch_to() macro to system.h

As those macros are fundamentally different between i386 and x86_64,
they are enclosed around an ifdef.

Signed-off-by: Glauber de Oliveira Costa <gcosta@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 0 insertions, 43 deletions

diff --git a/include/asm-x86/system_64.h b/include/asm-x86/system_64.h
index 9def35eb75e3..97fa251ccb2b 100644
--- a/include/asm-x86/system_64.h
+++ b/include/asm-x86/system_64.h
@@ -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)
 {