1 /* SPDX-License-Identifier: GPL-2.0-or-later */
2 #ifndef _VDSO_DATAPAGE_H
3 #define _VDSO_DATAPAGE_H
4 #ifdef __KERNEL__
5
6 /*
7 * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
8 * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
9 * IBM Corp.
10 */
11
12
13 /*
14 * Note about this structure:
15 *
16 * This structure was historically called systemcfg and exposed to
17 * userland via /proc/ppc64/systemcfg. Unfortunately, this became an
18 * ABI issue as some proprietary software started relying on being able
19 * to mmap() it, thus we have to keep the base layout at least for a
20 * few kernel versions.
21 *
22 * However, since ppc32 doesn't suffer from this backward handicap,
23 * a simpler version of the data structure is used there with only the
24 * fields actually used by the vDSO.
25 *
26 */
27
28 /*
29 * If the major version changes we are incompatible.
30 * Minor version changes are a hint.
31 */
32 #define SYSTEMCFG_MAJOR 1
33 #define SYSTEMCFG_MINOR 1
34
35 #ifndef __ASSEMBLY__
36
37 #include <linux/unistd.h>
38 #include <linux/time.h>
39
40 #define SYSCALL_MAP_SIZE ((NR_syscalls + 31) / 32)
41
42 /*
43 * So here is the ppc64 backward compatible version
44 */
45
46 #ifdef CONFIG_PPC64
47
48 struct vdso_data {
49 __u8 eye_catcher[16]; /* Eyecatcher: SYSTEMCFG:PPC64 0x00 */
50 struct { /* Systemcfg version numbers */
51 __u32 major; /* Major number 0x10 */
52 __u32 minor; /* Minor number 0x14 */
53 } version;
54
55 /* Note about the platform flags: it now only contains the lpar
56 * bit. The actual platform number is dead and buried
57 */
58 __u32 platform; /* Platform flags 0x18 */
59 __u32 processor; /* Processor type 0x1C */
60 __u64 processorCount; /* # of physical processors 0x20 */
61 __u64 physicalMemorySize; /* Size of real memory(B) 0x28 */
62 __u64 tb_orig_stamp; /* Timebase at boot 0x30 */
63 __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
64 __u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */
65 __u64 stamp_xsec; /* 0x48 */
66 __u64 tb_update_count; /* Timebase atomicity ctr 0x50 */
67 __u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */
68 __u32 tz_dsttime; /* Type of dst correction 0x5C */
69 __u32 dcache_size; /* L1 d-cache size 0x60 */
70 __u32 dcache_line_size; /* L1 d-cache line size 0x64 */
71 __u32 icache_size; /* L1 i-cache size 0x68 */
72 __u32 icache_line_size; /* L1 i-cache line size 0x6C */
73
74 /* those additional ones don't have to be located anywhere
75 * special as they were not part of the original systemcfg
76 */
77 __u32 dcache_block_size; /* L1 d-cache block size */
78 __u32 icache_block_size; /* L1 i-cache block size */
79 __u32 dcache_log_block_size; /* L1 d-cache log block size */
80 __u32 icache_log_block_size; /* L1 i-cache log block size */
81 __u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */
82 __s32 wtom_clock_nsec; /* Wall to monotonic clock nsec */
83 __s64 wtom_clock_sec; /* Wall to monotonic clock sec */
84 struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */
85 __u32 hrtimer_res; /* hrtimer resolution */
86 __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */
87 __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
88 };
89
90 #else /* CONFIG_PPC64 */
91
92 /*
93 * And here is the simpler 32 bits version
94 */
95 struct vdso_data {
96 __u64 tb_orig_stamp; /* Timebase at boot 0x30 */
97 __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
98 __u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */
99 __u64 stamp_xsec; /* 0x48 */
100 __u32 tb_update_count; /* Timebase atomicity ctr 0x50 */
101 __u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */
102 __u32 tz_dsttime; /* Type of dst correction 0x5C */
103 __s32 wtom_clock_sec; /* Wall to monotonic clock */
104 __s32 wtom_clock_nsec;
105 struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */
106 __u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */
107 __u32 hrtimer_res; /* hrtimer resolution */
108 __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
109 __u32 dcache_block_size; /* L1 d-cache block size */
110 __u32 icache_block_size; /* L1 i-cache block size */
111 __u32 dcache_log_block_size; /* L1 d-cache log block size */
112 __u32 icache_log_block_size; /* L1 i-cache log block size */
113 };
114
115 #endif /* CONFIG_PPC64 */
116
117 extern struct vdso_data *vdso_data;
118
119 #endif /* __ASSEMBLY__ */
120
121 #endif /* __KERNEL__ */
122 #endif /* _SYSTEMCFG_H */