Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
1da177e4 | 2 | * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation |
d3d2176a | 3 | * |
1da177e4 LT |
4 | * This program is free software; you can redistribute it and/or modify |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
d3d2176a | 8 | * |
1da177e4 LT |
9 | * This program is distributed in the hope that it will be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
d3d2176a | 13 | * |
1da177e4 LT |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/init.h> |
20 | #include <linux/mm.h> | |
21 | #include <linux/proc_fs.h> | |
1da177e4 LT |
22 | #include <linux/kernel.h> |
23 | ||
e8222502 | 24 | #include <asm/machdep.h> |
a7f290da | 25 | #include <asm/vdso_datapage.h> |
1da177e4 LT |
26 | #include <asm/rtas.h> |
27 | #include <asm/uaccess.h> | |
28 | #include <asm/prom.h> | |
29 | ||
188917e1 | 30 | #ifdef CONFIG_PPC64 |
1da177e4 | 31 | |
b33159b7 | 32 | static loff_t page_map_seek(struct file *file, loff_t off, int whence) |
1da177e4 | 33 | { |
b33159b7 | 34 | return fixed_size_llseek(file, off, whence, PAGE_SIZE); |
1da177e4 LT |
35 | } |
36 | ||
37 | static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, | |
38 | loff_t *ppos) | |
39 | { | |
d9dda78b AV |
40 | return simple_read_from_buffer(buf, nbytes, ppos, |
41 | PDE_DATA(file_inode(file)), PAGE_SIZE); | |
1da177e4 LT |
42 | } |
43 | ||
44 | static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) | |
45 | { | |
d9dda78b | 46 | if ((vma->vm_end - vma->vm_start) > PAGE_SIZE) |
1da177e4 LT |
47 | return -EINVAL; |
48 | ||
d9dda78b AV |
49 | remap_pfn_range(vma, vma->vm_start, |
50 | __pa(PDE_DATA(file_inode(file))) >> PAGE_SHIFT, | |
51 | PAGE_SIZE, vma->vm_page_prot); | |
1da177e4 LT |
52 | return 0; |
53 | } | |
54 | ||
188917e1 BH |
55 | static const struct file_operations page_map_fops = { |
56 | .llseek = page_map_seek, | |
57 | .read = page_map_read, | |
58 | .mmap = page_map_mmap | |
59 | }; | |
60 | ||
61 | ||
62 | static int __init proc_ppc64_init(void) | |
63 | { | |
64 | struct proc_dir_entry *pde; | |
65 | ||
66 | pde = proc_create_data("powerpc/systemcfg", S_IFREG|S_IRUGO, NULL, | |
67 | &page_map_fops, vdso_data); | |
68 | if (!pde) | |
69 | return 1; | |
271a15ea | 70 | proc_set_size(pde, PAGE_SIZE); |
188917e1 BH |
71 | |
72 | return 0; | |
73 | } | |
74 | __initcall(proc_ppc64_init); | |
75 | ||
76 | #endif /* CONFIG_PPC64 */ | |
77 | ||
78 | /* | |
79 | * Create the ppc64 and ppc64/rtas directories early. This allows us to | |
80 | * assume that they have been previously created in drivers. | |
81 | */ | |
82 | static int __init proc_ppc64_create(void) | |
83 | { | |
84 | struct proc_dir_entry *root; | |
85 | ||
86 | root = proc_mkdir("powerpc", NULL); | |
87 | if (!root) | |
88 | return 1; | |
89 | ||
90 | #ifdef CONFIG_PPC64 | |
91 | if (!proc_symlink("ppc64", NULL, "powerpc")) | |
92 | pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n"); | |
93 | #endif | |
94 | ||
95 | if (!of_find_node_by_path("/rtas")) | |
96 | return 0; | |
97 | ||
98 | if (!proc_mkdir("rtas", root)) | |
99 | return 1; | |
100 | ||
101 | if (!proc_symlink("rtas", NULL, "powerpc/rtas")) | |
102 | return 1; | |
103 | ||
104 | return 0; | |
105 | } | |
106 | core_initcall(proc_ppc64_create); |