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 */
118