Merge tag 'byteswap-for-linus-20121219' of git://git.infradead.org/users/dwmw2/byteswap

[~andy/linux] / arch / x86 / include / asm / vsyscall.h

diff --git a/arch/x86/include/asm/vsyscall.h b/arch/x86/include/asm/vsyscall.h
index eaea1d31f753092cd19ff6cf126f6c7c0f7cedb7..2a46ca720afca5fd6f5e5010698e8eea56748837 100644 (file)
--- a/arch/x86/include/asm/vsyscall.h
+++ b/arch/x86/include/asm/vsyscall.h
@@ -1,20 +1,8 @@
 #ifndef _ASM_X86_VSYSCALL_H
 #define _ASM_X86_VSYSCALL_H
 
-enum vsyscall_num {
-       __NR_vgettimeofday,
-       __NR_vtime,
-       __NR_vgetcpu,
-};
-
-#define VSYSCALL_START (-10UL << 20)
-#define VSYSCALL_SIZE 1024
-#define VSYSCALL_END (-2UL << 20)
-#define VSYSCALL_MAPPED_PAGES 1
-#define VSYSCALL_ADDR(vsyscall_nr) (VSYSCALL_START+VSYSCALL_SIZE*(vsyscall_nr))
-
-#ifdef __KERNEL__
 #include <linux/seqlock.h>
+#include <uapi/asm/vsyscall.h>
 
 #define VGETCPU_RDTSCP 1
 #define VGETCPU_LSL    2
@@ -33,6 +21,24 @@ extern void map_vsyscall(void);
  */
 extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address);
 
-#endif /* __KERNEL__ */
+#ifdef CONFIG_X86_64
+
+#define VGETCPU_CPU_MASK 0xfff
+
+static inline unsigned int __getcpu(void)
+{
+       unsigned int p;
+
+       if (VVAR(vgetcpu_mode) == VGETCPU_RDTSCP) {
+               /* Load per CPU data from RDTSCP */
+               native_read_tscp(&p);
+       } else {
+               /* Load per CPU data from GDT */
+               asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
+       }
+
+       return p;
+}
+#endif /* CONFIG_X86_64 */
 
 #endif /* _ASM_X86_VSYSCALL_H */