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
49 struct 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 */
93 struct 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
102 extern struct vdso_arch_data *vdso_data;
103
104 #else /* __ASSEMBLY__ */
105
106 .macro get_datapage ptr
107 bcl 20, 31, .+4
108 999:
109 mflr \ptr
110 addis \ptr, \ptr, (_vdso_datapage - 999b)@ha
111 addi \ptr, \ptr, (_vdso_datapage - 999b)@l
112 .endm
113
114 #include <asm/asm-offsets.h>
115 #include <asm/page.h>
116
117 .macro get_realdatapage ptr scratch
118 get_datapage \ptr
119 #ifdef CONFIG_TIME_NS
120 lwz \scratch, VDSO_CLOCKMODE_OFFSET(\ptr)
121 xoris \scratch, \scratch, VDSO_CLOCKMODE_TIMENS@h
122 xori \scratch, \scratch, VDSO_CLOCKMODE_TIMENS@l
123 cntlzw \scratch, \scratch
124 rlwinm \scratch, \scratch, PAGE_SHIFT - 5, 1 << PAGE_SHIFT
125 add \ptr, \ptr, \scratch
126 #endif
127 .endm
128
129 #endif /* __ASSEMBLY__ */
130
131 #endif /* __KERNEL__ */
132 #endif /* _SYSTEMCFG_H */
133
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