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