#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("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG)); } return p; } #endif /* CONFIG_X86_64 */ #endif /* _ASM_X86_VSYSCALL_H */