1 /* 2 * Copyright 2012 Tilera Corporation. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or 5 * modify it under the terms of the GNU General Public License 6 * as published by the Free Software Foundation, version 2. 7 * 8 * This program is distributed in the hope that it will be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or 11 * NON INFRINGEMENT. See the GNU General Public License for 12 * more details. 13 */ 14 15 #ifndef __TILE_VDSO_H__ 16 #define __TILE_VDSO_H__ 17 18 #include <linux/seqlock.h> 19 #include <linux/types.h> 20 21 /* 22 * Note about the vdso_data structure: 23 * 24 * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the 25 * structure is supposed to be known only to the function in the vdso 26 * itself and may change without notice. 27 */ 28 29 struct vdso_data { 30 seqcount_t tz_seq; /* Timezone seqlock */ 31 seqcount_t tb_seq; /* Timebase seqlock */ 32 __u64 cycle_last; /* TOD clock for xtime */ 33 __u64 mask; /* Cycle mask */ 34 __u32 mult; /* Cycle to nanosecond multiplier */ 35 __u32 shift; /* Cycle to nanosecond divisor (power of two) */ 36 __u64 wall_time_sec; 37 __u64 wall_time_snsec; 38 __u64 monotonic_time_sec; 39 __u64 monotonic_time_snsec; 40 __u64 wall_time_coarse_sec; 41 __u64 wall_time_coarse_nsec; 42 __u64 monotonic_time_coarse_sec; 43 __u64 monotonic_time_coarse_nsec; 44 __u32 tz_minuteswest; /* Minutes west of Greenwich */ 45 __u32 tz_dsttime; /* Type of dst correction */ 46 }; 47 48 extern struct vdso_data *vdso_data; 49 50 /* __vdso_rt_sigreturn is defined with the addresses in the vdso page. */ 51 extern void __vdso_rt_sigreturn(void); 52 53 extern int setup_vdso_pages(void); 54 55 #endif /* __TILE_VDSO_H__ */ 56