1 #ifndef _VDSO_DATAPAGE_H
2 #define _VDSO_DATAPAGE_H
6 * Copyright (C) 2002 Peter Bergner <bergner@vnet.ibm.com>, IBM
7 * Copyright (C) 2005 Benjamin Herrenschmidy <benh@kernel.crashing.org>,
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.
18 * Note about this structure:
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.
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.
33 * If the major version changes we are incompatible.
34 * Minor version changes are a hint.
36 #define SYSTEMCFG_MAJOR 1
37 #define SYSTEMCFG_MINOR 1
41 #include <linux/unistd.h>
43 #define SYSCALL_MAP_SIZE ((__NR_syscalls + 31) / 32)
46 * So here is the ppc64 backward compatible version
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 */
58 /* Note about the platform flags: it now only contains the lpar
59 * bit. The actual platform number is dead and burried
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 */
77 /* those additional ones don't have to be located anywhere
78 * special as they were not part of the original systemcfg
80 __u32 dcache_block_size; /* L1 d-cache block size */
81 __u32 icache_block_size; /* L1 i-cache block size */
82 __u32 dcache_log_block_size; /* L1 d-cache log block size */
83 __u32 icache_log_block_size; /* L1 i-cache log block size */
84 __s32 wtom_clock_sec; /* Wall to monotonic clock */
85 __s32 wtom_clock_nsec;
86 __u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls */
87 __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
90 #else /* CONFIG_PPC64 */
93 * And here is the simpler 32 bits version
96 __u64 tb_orig_stamp; /* Timebase at boot 0x30 */
97 __u64 tb_ticks_per_sec; /* Timebase tics / sec 0x38 */
98 __u64 tb_to_xs; /* Inverse of TB to 2^20 0x40 */
99 __u64 stamp_xsec; /* 0x48 */
100 __u32 tb_update_count; /* Timebase atomicity ctr 0x50 */
101 __u32 tz_minuteswest; /* Minutes west of Greenwich 0x58 */
102 __u32 tz_dsttime; /* Type of dst correction 0x5C */
103 __s32 wtom_clock_sec; /* Wall to monotonic clock */
104 __s32 wtom_clock_nsec;
105 __u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
106 __u32 dcache_block_size; /* L1 d-cache block size */
107 __u32 icache_block_size; /* L1 i-cache block size */
108 __u32 dcache_log_block_size; /* L1 d-cache log block size */
109 __u32 icache_log_block_size; /* L1 i-cache log block size */
112 #endif /* CONFIG_PPC64 */
115 extern struct vdso_data *vdso_data;
118 #endif /* __ASSEMBLY__ */
120 #endif /* __KERNEL__ */
121 #endif /* _SYSTEMCFG_H */