root/arch/x86/include/asm/vsyscall.h

INCLUDED FROM

DEFINITIONS

1. __getcpu

#ifndef _ASM_X86_VSYSCALL_H
#define _ASM_X86_VSYSCALL_H

#include <linux/seqlock.h>
#include <uapi/asm/vsyscall.h>

#define VGETCPU_RDTSCP  1
#define VGETCPU_LSL     2

/* kernel space (writeable) */
extern int vgetcpu_mode;
extern struct timezone sys_tz;

#include <asm/vvar.h>

extern void map_vsyscall(void);

/*
 * Called on instruction fetch fault in vsyscall page.
 * Returns true if handled.
 */
extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address);

#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 volatile ("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG));
        }

        return p;
}
#endif /* CONFIG_X86_64 */

#endif /* _ASM_X86_VSYSCALL_H */