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