]>
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 LT |
31 | |
32 | static loff_t page_map_seek( struct file *file, loff_t off, int whence) | |
33 | { | |
34 | loff_t new; | |
496ad9aa | 35 | struct proc_dir_entry *dp = PDE(file_inode(file)); |
1da177e4 LT |
36 | |
37 | switch(whence) { | |
38 | case 0: | |
39 | new = off; | |
40 | break; | |
41 | case 1: | |
42 | new = file->f_pos + off; | |
43 | break; | |
44 | case 2: | |
45 | new = dp->size + off; | |
46 | break; | |
47 | default: | |
48 | return -EINVAL; | |
49 | } | |
50 | if ( new < 0 || new > dp->size ) | |
51 | return -EINVAL; | |
52 | return (file->f_pos = new); | |
53 | } | |
54 | ||
55 | static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, | |
56 | loff_t *ppos) | |
57 | { | |
496ad9aa | 58 | struct proc_dir_entry *dp = PDE(file_inode(file)); |
1da177e4 LT |
59 | return simple_read_from_buffer(buf, nbytes, ppos, dp->data, dp->size); |
60 | } | |
61 | ||
62 | static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) | |
63 | { | |
496ad9aa | 64 | struct proc_dir_entry *dp = PDE(file_inode(file)); |
1da177e4 | 65 | |
1da177e4 LT |
66 | if ((vma->vm_end - vma->vm_start) > dp->size) |
67 | return -EINVAL; | |
68 | ||
69 | remap_pfn_range(vma, vma->vm_start, __pa(dp->data) >> PAGE_SHIFT, | |
70 | dp->size, vma->vm_page_prot); | |
71 | return 0; | |
72 | } | |
73 | ||
188917e1 BH |
74 | static const struct file_operations page_map_fops = { |
75 | .llseek = page_map_seek, | |
76 | .read = page_map_read, | |
77 | .mmap = page_map_mmap | |
78 | }; | |
79 | ||
80 | ||
81 | static int __init proc_ppc64_init(void) | |
82 | { | |
83 | struct proc_dir_entry *pde; | |
84 | ||
85 | pde = proc_create_data("powerpc/systemcfg", S_IFREG|S_IRUGO, NULL, | |
86 | &page_map_fops, vdso_data); | |
87 | if (!pde) | |
88 | return 1; | |
89 | pde->size = PAGE_SIZE; | |
90 | ||
91 | return 0; | |
92 | } | |
93 | __initcall(proc_ppc64_init); | |
94 | ||
95 | #endif /* CONFIG_PPC64 */ | |
96 | ||
97 | /* | |
98 | * Create the ppc64 and ppc64/rtas directories early. This allows us to | |
99 | * assume that they have been previously created in drivers. | |
100 | */ | |
101 | static int __init proc_ppc64_create(void) | |
102 | { | |
103 | struct proc_dir_entry *root; | |
104 | ||
105 | root = proc_mkdir("powerpc", NULL); | |
106 | if (!root) | |
107 | return 1; | |
108 | ||
109 | #ifdef CONFIG_PPC64 | |
110 | if (!proc_symlink("ppc64", NULL, "powerpc")) | |
111 | pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n"); | |
112 | #endif | |
113 | ||
114 | if (!of_find_node_by_path("/rtas")) | |
115 | return 0; | |
116 | ||
117 | if (!proc_mkdir("rtas", root)) | |
118 | return 1; | |
119 | ||
120 | if (!proc_symlink("rtas", NULL, "powerpc/rtas")) | |
121 | return 1; | |
122 | ||
123 | return 0; | |
124 | } | |
125 | core_initcall(proc_ppc64_create); |