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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 | 2 | /* |
1da177e4 | 3 | * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation |
1da177e4 LT |
4 | */ |
5 | ||
1da177e4 LT |
6 | #include <linux/init.h> |
7 | #include <linux/mm.h> | |
8 | #include <linux/proc_fs.h> | |
1da177e4 LT |
9 | #include <linux/kernel.h> |
10 | ||
e8222502 | 11 | #include <asm/machdep.h> |
a7f290da | 12 | #include <asm/vdso_datapage.h> |
1da177e4 | 13 | #include <asm/rtas.h> |
7c0f6ba6 | 14 | #include <linux/uaccess.h> |
1da177e4 LT |
15 | #include <asm/prom.h> |
16 | ||
188917e1 | 17 | #ifdef CONFIG_PPC64 |
1da177e4 | 18 | |
b33159b7 | 19 | static loff_t page_map_seek(struct file *file, loff_t off, int whence) |
1da177e4 | 20 | { |
b33159b7 | 21 | return fixed_size_llseek(file, off, whence, PAGE_SIZE); |
1da177e4 LT |
22 | } |
23 | ||
24 | static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, | |
25 | loff_t *ppos) | |
26 | { | |
d9dda78b AV |
27 | return simple_read_from_buffer(buf, nbytes, ppos, |
28 | PDE_DATA(file_inode(file)), PAGE_SIZE); | |
1da177e4 LT |
29 | } |
30 | ||
31 | static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) | |
32 | { | |
d9dda78b | 33 | if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) |
1da177e4 LT |
34 | return -EINVAL; |
35 | ||
d9dda78b AV |
36 | remap_pfn_range(vma, vma->vm_start, |
37 | __pa(PDE_DATA(file_inode(file))) >> PAGE_SHIFT, | |
38 | PAGE_SIZE, vma->vm_page_prot); | |
1da177e4 LT |
39 | return 0; |
40 | } | |
41 | ||
188917e1 BH |
42 | static const struct file_operations page_map_fops = { |
43 | .llseek = page_map_seek, | |
44 | .read = page_map_read, | |
45 | .mmap = page_map_mmap | |
46 | }; | |
47 | ||
48 | ||
49 | static int __init proc_ppc64_init(void) | |
50 | { | |
51 | struct proc_dir_entry *pde; | |
52 | ||
57ad583f | 53 | pde = proc_create_data("powerpc/systemcfg", S_IFREG | 0444, NULL, |
188917e1 BH |
54 | &page_map_fops, vdso_data); |
55 | if (!pde) | |
56 | return 1; | |
271a15ea | 57 | proc_set_size(pde, PAGE_SIZE); |
188917e1 BH |
58 | |
59 | return 0; | |
60 | } | |
61 | __initcall(proc_ppc64_init); | |
62 | ||
63 | #endif /* CONFIG_PPC64 */ | |
64 | ||
65 | /* | |
66 | * Create the ppc64 and ppc64/rtas directories early. This allows us to | |
67 | * assume that they have been previously created in drivers. | |
68 | */ | |
69 | static int __init proc_ppc64_create(void) | |
70 | { | |
71 | struct proc_dir_entry *root; | |
72 | ||
73 | root = proc_mkdir("powerpc", NULL); | |
74 | if (!root) | |
75 | return 1; | |
76 | ||
77 | #ifdef CONFIG_PPC64 | |
78 | if (!proc_symlink("ppc64", NULL, "powerpc")) | |
79 | pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n"); | |
80 | #endif | |
81 | ||
82 | if (!of_find_node_by_path("/rtas")) | |
83 | return 0; | |
84 | ||
85 | if (!proc_mkdir("rtas", root)) | |
86 | return 1; | |
87 | ||
88 | if (!proc_symlink("rtas", NULL, "powerpc/rtas")) | |
89 | return 1; | |
90 | ||
91 | return 0; | |
92 | } | |
93 | core_initcall(proc_ppc64_create); |