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 
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 */
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  */
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 */
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 extern struct vdso_data *vdso_data;
120 
121 #endif /* __ASSEMBLY__ */
122 
123 #endif /* __KERNEL__ */
124 #endif /* _SYSTEMCFG_H */
125