projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1965aae3 PA |
1 | #ifndef _ASM_X86_VSYSCALL_H |
| 2 | #define _ASM_X86_VSYSCALL_H | |
| 1da177e4 | 3 | |
| 75da736f | 4 | #include <linux/seqlock.h> |
| af170c50 | 5 | #include <uapi/asm/vsyscall.h> |
| 1da177e4 | 6 | |
| c08c8205 VP |
7 | #define VGETCPU_RDTSCP 1 |
| 8 | #define VGETCPU_LSL 2 | |
| 9 | ||
| 1da177e4 | 10 | /* kernel space (writeable) */ |
| c08c8205 | 11 | extern int vgetcpu_mode; |
| 1da177e4 | 12 | extern struct timezone sys_tz; |
| 1da177e4 | 13 | |
| 8c49d9a7 AL |
14 | #include <asm/vvar.h> |
| 15 | ||
| e4026440 IM |
16 | extern void map_vsyscall(void); |
| 17 | ||
| 3ae36655 AL |
18 | /* |
| 19 | * Called on instruction fetch fault in vsyscall page. | |
| 20 | * Returns true if handled. | |
| 21 | */ | |
| 22 | extern bool emulate_vsyscall(struct pt_regs *regs, unsigned long address); | |
| 23 | ||
| 51c19b4f MT |
24 | #ifdef CONFIG_X86_64 |
| 25 | ||
| 26 | #define VGETCPU_CPU_MASK 0xfff | |
| 27 | ||
| 28 | static inline unsigned int __getcpu(void) | |
| 29 | { | |
| 30 | unsigned int p; | |
| 31 | ||
| 32 | if (VVAR(vgetcpu_mode) == VGETCPU_RDTSCP) { | |
| 33 | /* Load per CPU data from RDTSCP */ | |
| 34 | native_read_tscp(&p); | |
| 35 | } else { | |
| 36 | /* Load per CPU data from GDT */ | |
| 37 | asm("lsl %1,%0" : "=r" (p) : "r" (__PER_CPU_SEG)); | |
| 38 | } | |
| 39 | ||
| 40 | return p; | |
| 41 | } | |
| 42 | #endif /* CONFIG_X86_64 */ | |
| 43 | ||
| 1965aae3 | 44 | #endif /* _ASM_X86_VSYSCALL_H */ |