1 files changed, 180 insertions, 0 deletions

diff --git a/include/asm-x86/system_64.h b/include/asm-x86/system_64.h
new file mode 100644
index 000000000000..02175aa1d16a
--- /dev/null
+++ b/include/asm-x86/system_64.h
@@ -0,0 +1,180 @@
+#ifndef __ASM_SYSTEM_H
+#define __ASM_SYSTEM_H
+
+#include <linux/kernel.h>
+#include <asm/segment.h>
+#include <asm/cmpxchg.h>
+
+#ifdef __KERNEL__
+
+#define __STR(x) #x
+#define STR(x) __STR(x)
+
+#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.rsp)), \
+                       [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)
+    
+extern void load_gs_index(unsigned); 
+
+/*
+ * Load a segment. Fall back on loading the zero
+ * segment if something goes wrong..
+ */
+#define loadsegment(seg,value)  \
+        asm volatile("\n"                       \
+                "1:\t"                          \
+                "movl %k0,%%" #seg "\n"         \
+                "2:\n"                          \
+                ".section .fixup,\"ax\"\n"      \
+                "3:\t"                          \
+                "movl %1,%%" #seg "\n\t"        \
+                "jmp 2b\n"                      \
+                ".previous\n"                   \
+                ".section __ex_table,\"a\"\n\t" \
+                ".align 8\n\t"                  \
+                ".quad 1b,3b\n"                 \
+                ".previous"                     \
+                : :"r" (value), "r" (0))
+
+/*
+ * Clear and set 'TS' bit respectively
+ */
+#define clts() __asm__ __volatile__ ("clts")
+
+static inline unsigned long read_cr0(void)
+{ 
+        unsigned long cr0;
+        asm volatile("movq %%cr0,%0" : "=r" (cr0));
+        return cr0;
+}
+
+static inline void write_cr0(unsigned long val) 
+{ 
+        asm volatile("movq %0,%%cr0" :: "r" (val));
+}
+
+static inline unsigned long read_cr2(void)
+{
+        unsigned long cr2;
+        asm("movq %%cr2,%0" : "=r" (cr2));
+        return cr2;
+}
+
+static inline void write_cr2(unsigned long val)
+{
+        asm volatile("movq %0,%%cr2" :: "r" (val));
+}
+
+static inline unsigned long read_cr3(void)
+{ 
+        unsigned long cr3;
+        asm("movq %%cr3,%0" : "=r" (cr3));
+        return cr3;
+}
+
+static inline void write_cr3(unsigned long val)
+{
+        asm volatile("movq %0,%%cr3" :: "r" (val) : "memory");
+}
+
+static inline unsigned long read_cr4(void)
+{ 
+        unsigned long cr4;
+        asm("movq %%cr4,%0" : "=r" (cr4));
+        return cr4;
+}
+
+static inline void write_cr4(unsigned long val)
+{ 
+        asm volatile("movq %0,%%cr4" :: "r" (val) : "memory");
+}
+
+static inline unsigned long read_cr8(void)
+{
+        unsigned long cr8;
+        asm("movq %%cr8,%0" : "=r" (cr8));
+        return cr8;
+}
+
+static inline void write_cr8(unsigned long val)
+{
+        asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
+}
+
+#define stts() write_cr0(8 | read_cr0())
+
+#define wbinvd() \
+        __asm__ __volatile__ ("wbinvd": : :"memory")
+
+#endif  /* __KERNEL__ */
+
+#define nop() __asm__ __volatile__ ("nop")
+
+#ifdef CONFIG_SMP
+#define smp_mb()        mb()
+#define smp_rmb()       rmb()
+#define smp_wmb()       wmb()
+#define smp_read_barrier_depends()      do {} while(0)
+#else
+#define smp_mb()        barrier()
+#define smp_rmb()       barrier()
+#define smp_wmb()       barrier()
+#define smp_read_barrier_depends()      do {} while(0)
+#endif
+
+    
+/*
+ * Force strict CPU ordering.
+ * And yes, this is required on UP too when we're talking
+ * to devices.
+ */
+#define mb()    asm volatile("mfence":::"memory")
+#define rmb()   asm volatile("lfence":::"memory")
+
+#ifdef CONFIG_UNORDERED_IO
+#define wmb()   asm volatile("sfence" ::: "memory")
+#else
+#define wmb()   asm volatile("" ::: "memory")
+#endif
+#define read_barrier_depends()  do {} while(0)
+#define set_mb(var, value) do { (void) xchg(&var, value); } while (0)
+
+#define warn_if_not_ulong(x) do { unsigned long foo; (void) (&(x) == &foo); } while (0)
+
+#include <linux/irqflags.h>
+
+void cpu_idle_wait(void);
+
+extern unsigned long arch_align_stack(unsigned long sp);
+extern void free_init_pages(char *what, unsigned long begin, unsigned long end);
+
+#endif