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
40#define SYSCALL_MAP_SIZE      ((NR_syscalls + 31) / 32)
41
42/*
43 * So here is the ppc64 backward compatible version
44 */
45
46#ifdef CONFIG_PPC64
47
48struct vdso_data {
49	__u8  eye_catcher[16];		/* Eyecatcher: SYSTEMCFG:PPC64	0x00 */
50	struct {			/* Systemcfg version numbers	     */
51		__u32 major;		/* Major number			0x10 */
52		__u32 minor;		/* Minor number			0x14 */
53	} version;
54
55	/* Note about the platform flags: it now only contains the lpar
56	 * bit. The actual platform number is dead and buried
57	 */
58	__u32 platform;			/* Platform flags		0x18 */
59	__u32 processor;		/* Processor type		0x1C */
60	__u64 processorCount;		/* # of physical processors	0x20 */
61	__u64 physicalMemorySize;	/* Size of real memory(B)	0x28 */
62	__u64 tb_orig_stamp;		/* Timebase at boot		0x30 */
63	__u64 tb_ticks_per_sec;		/* Timebase tics / sec		0x38 */
64	__u64 tb_to_xs;			/* Inverse of TB to 2^20	0x40 */
65	__u64 stamp_xsec;		/*				0x48 */
66	__u64 tb_update_count;		/* Timebase atomicity ctr	0x50 */
67	__u32 tz_minuteswest;		/* Minutes west of Greenwich	0x58 */
68	__u32 tz_dsttime;		/* Type of dst correction	0x5C */
69	__u32 dcache_size;		/* L1 d-cache size		0x60 */
70	__u32 dcache_line_size;		/* L1 d-cache line size		0x64 */
71	__u32 icache_size;		/* L1 i-cache size		0x68 */
72	__u32 icache_line_size;		/* L1 i-cache line size		0x6C */
73
74	/* those additional ones don't have to be located anywhere
75	 * special as they were not part of the original systemcfg
76	 */
77	__u32 dcache_block_size;		/* L1 d-cache block size     */
78	__u32 icache_block_size;		/* L1 i-cache block size     */
79	__u32 dcache_log_block_size;		/* L1 d-cache log block size */
80	__u32 icache_log_block_size;		/* L1 i-cache log block size */
81	__u32 stamp_sec_fraction;		/* fractional seconds of stamp_xtime */
82	__s32 wtom_clock_nsec;			/* Wall to monotonic clock nsec */
83	__s64 wtom_clock_sec;			/* Wall to monotonic clock sec */
84	__s64 stamp_xtime_sec;			/* xtime secs as at tb_orig_stamp */
85	__s64 stamp_xtime_nsec;			/* xtime nsecs as at tb_orig_stamp */
86	__u32 hrtimer_res;			/* hrtimer resolution */
87   	__u32 syscall_map_64[SYSCALL_MAP_SIZE]; /* map of syscalls  */
88   	__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
89};
90
91#else /* CONFIG_PPC64 */
92
93/*
94 * And here is the simpler 32 bits version
95 */
96struct vdso_data {
97	__u64 tb_orig_stamp;		/* Timebase at boot		0x30 */
98	__u64 tb_ticks_per_sec;		/* Timebase tics / sec		0x38 */
99	__u64 tb_to_xs;			/* Inverse of TB to 2^20	0x40 */
100	__u64 stamp_xsec;		/*				0x48 */
101	__u32 tb_update_count;		/* Timebase atomicity ctr	0x50 */
102	__u32 tz_minuteswest;		/* Minutes west of Greenwich	0x58 */
103	__u32 tz_dsttime;		/* Type of dst correction	0x5C */
104	__s32 wtom_clock_sec;			/* Wall to monotonic clock */
105	__s32 wtom_clock_nsec;
106	__s32 stamp_xtime_sec;		/* xtime seconds as at tb_orig_stamp */
107	__s32 stamp_xtime_nsec;		/* xtime nsecs as at tb_orig_stamp */
108	__u32 stamp_sec_fraction;	/* fractional seconds of stamp_xtime */
109	__u32 hrtimer_res;		/* hrtimer resolution */
110   	__u32 syscall_map_32[SYSCALL_MAP_SIZE]; /* map of syscalls */
111};
112
113#endif /* CONFIG_PPC64 */
114
115extern struct vdso_data *vdso_data;
116
117#else /* __ASSEMBLY__ */
118
119.macro get_datapage ptr, tmp
120	bcl	20, 31, .+4
121	mflr	\ptr
122	addi	\ptr, \ptr, (__kernel_datapage_offset - (.-4))@l
123	lwz	\tmp, 0(\ptr)
124	add	\ptr, \tmp, \ptr
125.endm
126
127#endif /* __ASSEMBLY__ */
128
129#endif /* __KERNEL__ */
130#endif /* _SYSTEMCFG_H */
131