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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#include <vdso/datapage.h>
40
41#define SYSCALL_MAP_SIZE ((NR_syscalls + 31) / 32)
42
43/*
44 * So here is the ppc64 backward compatible version
45 */
46
47#ifdef CONFIG_PPC64
48
49struct vdso_arch_data {
50 __u8 eye_catcher[16]; /* Eyecatcher: SYSTEMCFG:PPC64 0x00 */
51 struct { /* Systemcfg version numbers */
52 __u32 major; /* Major number 0x10 */
53 __u32 minor; /* Minor number 0x14 */
54 } version;
55
56 /* Note about the platform flags: it now only contains the lpar
57 * bit. The actual platform number is dead and buried
58 */
59 __u32 platform; /* Platform flags 0x18 */
60 __u32 processor; /* Processor type 0x1C */
61 __u64 processorCount; /* # of physical processors 0x20 */
62 __u64 physicalMemorySize; /* Size of real memory(B) 0x28 */
63 __u64 tb_orig_stamp; /* (NU) Timebase at boot 0x30 */
64 __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
65 __u64 tb_to_xs; /* (NU) Inverse of TB to 2^20 0x40 */
66 __u64 stamp_xsec; /* (NU) 0x48 */
67 __u64 tb_update_count; /* (NU) Timebase atomicity ctr 0x50 */
68 __u32 tz_minuteswest; /* (NU) Min. west of Greenwich 0x58 */
69 __u32 tz_dsttime; /* (NU) Type of dst correction 0x5C */
70 __u32 dcache_size; /* L1 d-cache size 0x60 */
71 __u32 dcache_line_size; /* L1 d-cache line size 0x64 */
72 __u32 icache_size; /* L1 i-cache size 0x68 */
73 __u32 icache_line_size; /* L1 i-cache line size 0x6C */
74
75 /* those additional ones don't have to be located anywhere
76 * special as they were not part of the original systemcfg
77 */
78 __u32 dcache_block_size; /* L1 d-cache block size */
79 __u32 icache_block_size; /* L1 i-cache block size */
80 __u32 dcache_log_block_size; /* L1 d-cache log block size */
81 __u32 icache_log_block_size; /* L1 i-cache log block size */
82 __u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */
83 __u32 compat_syscall_map[SYSCALL_MAP_SIZE]; /* Map of compat syscalls */
84
85 struct vdso_data data[CS_BASES];
86};
87
88#else /* CONFIG_PPC64 */
89
90/*
91 * And here is the simpler 32 bits version
92 */
93struct vdso_arch_data {
94 __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
95 __u32 syscall_map[SYSCALL_MAP_SIZE]; /* Map of syscalls */
96 __u32 compat_syscall_map[0]; /* No compat syscalls on PPC32 */
97 struct vdso_data data[CS_BASES];
98};
99
100#endif /* CONFIG_PPC64 */
101
102extern struct vdso_arch_data *vdso_data;
103
104#else /* __ASSEMBLY__ */
105
106.macro get_datapage ptr
107 bcl 20, 31, .+4
108999:
109 mflr \ptr
110 addis \ptr, \ptr, (_vdso_datapage - 999b)@ha
111 addi \ptr, \ptr, (_vdso_datapage - 999b)@l
112.endm
113
114#endif /* __ASSEMBLY__ */
115
116#endif /* __KERNEL__ */
117#endif /* _SYSTEMCFG_H */
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#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
52struct 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 */
86 __s32 wtom_clock_nsec;
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 */
98struct 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 */
107 __s32 wtom_clock_nsec;
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
119extern struct vdso_data *vdso_data;
120
121#endif /* __ASSEMBLY__ */
122
123#endif /* __KERNEL__ */
124#endif /* _SYSTEMCFG_H */