1 /* SPDX-License-Identifier: GPL-2.0 */ 2 #ifndef __S390_VDSO_H__ 3 #define __S390_VDSO_H__ 4 5 /* Default link addresses for the vDSOs */ 6 #define VDSO32_LBASE 0 7 #define VDSO64_LBASE 0 8 9 #define VDSO_VERSION_STRING LINUX_2.6.29 10 11 #ifndef __ASSEMBLY__ 12 13 /* 14 * Note about the vdso_data and vdso_per_cpu_data structures: 15 * 16 * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the 17 * structure is supposed to be known only to the function in the vdso 18 * itself and may change without notice. 19 */ 20 21 struct vdso_data { 22 __u64 tb_update_count; /* Timebase atomicity ctr 0x00 */ 23 __u64 xtime_tod_stamp; /* TOD clock for xtime 0x08 */ 24 __u64 xtime_clock_sec; /* Kernel time 0x10 */ 25 __u64 xtime_clock_nsec; /* 0x18 */ 26 __u64 xtime_coarse_sec; /* Coarse kernel time 0x20 */ 27 __u64 xtime_coarse_nsec; /* 0x28 */ 28 __u64 wtom_clock_sec; /* Wall to monotonic clock 0x30 */ 29 __u64 wtom_clock_nsec; /* 0x38 */ 30 __u64 wtom_coarse_sec; /* Coarse wall to monotonic 0x40 */ 31 __u64 wtom_coarse_nsec; /* 0x48 */ 32 __u32 tz_minuteswest; /* Minutes west of Greenwich 0x50 */ 33 __u32 tz_dsttime; /* Type of dst correction 0x54 */ 34 __u32 ectg_available; /* ECTG instruction present 0x58 */ 35 __u32 tk_mult; /* Mult. used for xtime_nsec 0x5c */ 36 __u32 tk_shift; /* Shift used for xtime_nsec 0x60 */ 37 __u32 ts_dir; /* TOD steering direction 0x64 */ 38 __u64 ts_end; /* TOD steering end 0x68 */ 39 __u32 hrtimer_res; /* hrtimer resolution 0x70 */ 40 }; 41 42 struct vdso_per_cpu_data { 43 __u64 ectg_timer_base; 44 __u64 ectg_user_time; 45 /* 46 * Note: node_id and cpu_nr must be at adjacent memory locations. 47 * VDSO userspace must read both values with a single instruction. 48 */ 49 union { 50 __u64 getcpu_val; 51 struct { 52 __u32 node_id; 53 __u32 cpu_nr; 54 }; 55 }; 56 }; 57 58 extern struct vdso_data *vdso_data; 59 extern struct vdso_data boot_vdso_data; 60 61 void vdso_alloc_boot_cpu(struct lowcore *lowcore); 62 int vdso_alloc_per_cpu(struct lowcore *lowcore); 63 void vdso_free_per_cpu(struct lowcore *lowcore); 64 65 #endif /* __ASSEMBLY__ */ 66 #endif /* __S390_VDSO_H__ */ 67