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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 | ||
50 | struct 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 | */ | |
0c37ec2a | 76 | __s32 wtom_clock_sec; /* Wall to monotonic clock */ |
a7f290da BH |
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 | */ | |
87 | struct 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__ | |
103 | extern struct vdso_data *vdso_data; | |
104 | #endif | |
105 | ||
106 | #endif /* __ASSEMBLY__ */ | |
107 | ||
108 | #endif /* _SYSTEMCFG_H */ |