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 | ||
19 | #include <linux/config.h> | |
20 | #include <linux/init.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/proc_fs.h> | |
23 | #include <linux/slab.h> | |
24 | #include <linux/kernel.h> | |
25 | ||
a7f290da | 26 | #include <asm/vdso_datapage.h> |
1da177e4 LT |
27 | #include <asm/rtas.h> |
28 | #include <asm/uaccess.h> | |
29 | #include <asm/prom.h> | |
30 | ||
31 | static loff_t page_map_seek( struct file *file, loff_t off, int whence); | |
32 | static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, | |
33 | loff_t *ppos); | |
34 | static int page_map_mmap( struct file *file, struct vm_area_struct *vma ); | |
35 | ||
36 | static struct file_operations page_map_fops = { | |
37 | .llseek = page_map_seek, | |
38 | .read = page_map_read, | |
39 | .mmap = page_map_mmap | |
40 | }; | |
41 | ||
42 | /* | |
43 | * Create the ppc64 and ppc64/rtas directories early. This allows us to | |
44 | * assume that they have been previously created in drivers. | |
45 | */ | |
46 | static int __init proc_ppc64_create(void) | |
47 | { | |
48 | struct proc_dir_entry *root; | |
49 | ||
50 | root = proc_mkdir("ppc64", NULL); | |
51 | if (!root) | |
52 | return 1; | |
53 | ||
799d6046 | 54 | if (!(platform_is_pseries() || _machine == PLATFORM_CELL)) |
1da177e4 LT |
55 | return 0; |
56 | ||
57 | if (!proc_mkdir("rtas", root)) | |
58 | return 1; | |
59 | ||
60 | if (!proc_symlink("rtas", NULL, "ppc64/rtas")) | |
61 | return 1; | |
62 | ||
63 | return 0; | |
64 | } | |
65 | core_initcall(proc_ppc64_create); | |
66 | ||
67 | static int __init proc_ppc64_init(void) | |
68 | { | |
69 | struct proc_dir_entry *pde; | |
70 | ||
71 | pde = create_proc_entry("ppc64/systemcfg", S_IFREG|S_IRUGO, NULL); | |
72 | if (!pde) | |
73 | return 1; | |
74 | pde->nlink = 1; | |
a7f290da | 75 | pde->data = vdso_data; |
1da177e4 LT |
76 | pde->size = PAGE_SIZE; |
77 | pde->proc_fops = &page_map_fops; | |
78 | ||
79 | return 0; | |
80 | } | |
81 | __initcall(proc_ppc64_init); | |
82 | ||
83 | static loff_t page_map_seek( struct file *file, loff_t off, int whence) | |
84 | { | |
85 | loff_t new; | |
86 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
87 | ||
88 | switch(whence) { | |
89 | case 0: | |
90 | new = off; | |
91 | break; | |
92 | case 1: | |
93 | new = file->f_pos + off; | |
94 | break; | |
95 | case 2: | |
96 | new = dp->size + off; | |
97 | break; | |
98 | default: | |
99 | return -EINVAL; | |
100 | } | |
101 | if ( new < 0 || new > dp->size ) | |
102 | return -EINVAL; | |
103 | return (file->f_pos = new); | |
104 | } | |
105 | ||
106 | static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes, | |
107 | loff_t *ppos) | |
108 | { | |
109 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
110 | return simple_read_from_buffer(buf, nbytes, ppos, dp->data, dp->size); | |
111 | } | |
112 | ||
113 | static int page_map_mmap( struct file *file, struct vm_area_struct *vma ) | |
114 | { | |
115 | struct proc_dir_entry *dp = PDE(file->f_dentry->d_inode); | |
116 | ||
117 | vma->vm_flags |= VM_SHM | VM_LOCKED; | |
118 | ||
119 | if ((vma->vm_end - vma->vm_start) > dp->size) | |
120 | return -EINVAL; | |
121 | ||
122 | remap_pfn_range(vma, vma->vm_start, __pa(dp->data) >> PAGE_SHIFT, | |
123 | dp->size, vma->vm_page_prot); | |
124 | return 0; | |
125 | } | |
126 |