| #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 */ |
