vdso_datapage.h revision 8fd63a9ea7528463211a6c88d500c51851d960c8 
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 burried
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
119#ifdef __KERNEL__
120extern struct vdso_data *vdso_data;
121#endif
122
123#endif /* __ASSEMBLY__ */
124
125#endif /* __KERNEL__ */
126#endif /* _SYSTEMCFG_H */
127