Linux Kernel  3.7.1
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vdso_datapage.h
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1 #ifndef _VDSO_DATAPAGE_H
2 #define _VDSO_DATAPAGE_H
3 #ifdef __KERNEL__
4 
5 /*
6  * Copyright (C) 2002 Peter Bergner <[email protected]>, IBM
7  * Copyright (C) 2005 Benjamin Herrenschmidy <[email protected]>,
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 #include <linux/time.h>
43 
44 #define SYSCALL_MAP_SIZE ((__NR_syscalls + 31) / 32)
45 
46 /*
47  * So here is the ppc64 backward compatible version
48  */
49 
50 #ifdef CONFIG_PPC64
51 
52 struct vdso_data {
53  __u8 eye_catcher[16]; /* Eyecatcher: SYSTEMCFG:PPC64 0x00 */
54  struct { /* Systemcfg version numbers */
55  __u32 major; /* Major number 0x10 */
56  __u32 minor; /* Minor number 0x14 */
57  } version;
58 
59  /* Note about the platform flags: it now only contains the lpar
60  * bit. The actual platform number is dead and buried
61  */
62  __u32 platform; /* Platform flags 0x18 */
63  __u32 processor; /* Processor type 0x1C */
64  __u64 processorCount; /* # of physical processors 0x20 */
65  __u64 physicalMemorySize; /* Size of real memory(B) 0x28 */
66  __u64 tb_orig_stamp; /* Timebase at boot 0x30 */
67  __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
68  __u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */
69  __u64 stamp_xsec; /* 0x48 */
70  __u64 tb_update_count; /* Timebase atomicity ctr 0x50 */
71  __u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */
72  __u32 tz_dsttime; /* Type of dst correction 0x5C */
73  __u32 dcache_size; /* L1 d-cache size 0x60 */
74  __u32 dcache_line_size; /* L1 d-cache line size 0x64 */
75  __u32 icache_size; /* L1 i-cache size 0x68 */
76  __u32 icache_line_size; /* L1 i-cache line size 0x6C */
77 
78  /* those additional ones don't have to be located anywhere
79  * special as they were not part of the original systemcfg
80  */
81  __u32 dcache_block_size; /* L1 d-cache block size */
82  __u32 icache_block_size; /* L1 i-cache block size */
83  __u32 dcache_log_block_size; /* L1 d-cache log block size */
84  __u32 icache_log_block_size; /* L1 i-cache log block size */
85  __s32 wtom_clock_sec; /* Wall to monotonic clock */
87  struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */
88  __u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */
89  __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */
90  __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
91 };
92 
93 #else /* CONFIG_PPC64 */
94 
95 /*
96  * And here is the simpler 32 bits version
97  */
98 struct vdso_data {
99  __u64 tb_orig_stamp; /* Timebase at boot 0x30 */
100  __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
101  __u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */
102  __u64 stamp_xsec; /* 0x48 */
103  __u32 tb_update_count; /* Timebase atomicity ctr 0x50 */
104  __u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */
105  __u32 tz_dsttime; /* Type of dst correction 0x5C */
106  __s32 wtom_clock_sec; /* Wall to monotonic clock */
108  struct timespec stamp_xtime; /* xtime as at tb_orig_stamp */
109  __u32 stamp_sec_fraction; /* fractional seconds of stamp_xtime */
110  __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
111  __u32 dcache_block_size; /* L1 d-cache block size */
112  __u32 icache_block_size; /* L1 i-cache block size */
113  __u32 dcache_log_block_size; /* L1 d-cache log block size */
114  __u32 icache_log_block_size; /* L1 i-cache log block size */
115 };
116 
117 #endif /* CONFIG_PPC64 */
118 
119 extern struct vdso_data *vdso_data;
120 
121 #endif /* __ASSEMBLY__ */
122 
123 #endif /* __KERNEL__ */
124 #endif /* _SYSTEMCFG_H */