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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
4 */
5
6#include <linux/init.h>
7#include <linux/mm.h>
8#include <linux/proc_fs.h>
9#include <linux/kernel.h>
10#include <linux/of.h>
11
12#include <asm/machdep.h>
13#include <asm/vdso_datapage.h>
14#include <asm/rtas.h>
15#include <linux/uaccess.h>
16
17#ifdef CONFIG_PPC64
18
19static loff_t page_map_seek(struct file *file, loff_t off, int whence)
20{
21 return fixed_size_llseek(file, off, whence, PAGE_SIZE);
22}
23
24static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
25 loff_t *ppos)
26{
27 return simple_read_from_buffer(buf, nbytes, ppos,
28 pde_data(file_inode(file)), PAGE_SIZE);
29}
30
31static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
32{
33 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE)
34 return -EINVAL;
35
36 remap_pfn_range(vma, vma->vm_start,
37 __pa(pde_data(file_inode(file))) >> PAGE_SHIFT,
38 PAGE_SIZE, vma->vm_page_prot);
39 return 0;
40}
41
42static const struct proc_ops page_map_proc_ops = {
43 .proc_lseek = page_map_seek,
44 .proc_read = page_map_read,
45 .proc_mmap = page_map_mmap,
46};
47
48
49static int __init proc_ppc64_init(void)
50{
51 struct proc_dir_entry *pde;
52
53 pde = proc_create_data("powerpc/systemcfg", S_IFREG | 0444, NULL,
54 &page_map_proc_ops, vdso_data);
55 if (!pde)
56 return 1;
57 proc_set_size(pde, PAGE_SIZE);
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 */
69static 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}
93core_initcall(proc_ppc64_create);
1/*
2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
3 *
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.
8 *
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.
13 *
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/init.h>
20#include <linux/mm.h>
21#include <linux/proc_fs.h>
22#include <linux/kernel.h>
23
24#include <asm/machdep.h>
25#include <asm/vdso_datapage.h>
26#include <asm/rtas.h>
27#include <asm/uaccess.h>
28#include <asm/prom.h>
29
30#ifdef CONFIG_PPC64
31
32static loff_t page_map_seek( struct file *file, loff_t off, int whence)
33{
34 loff_t new;
35 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
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
55static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
56 loff_t *ppos)
57{
58 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
59 return simple_read_from_buffer(buf, nbytes, ppos, dp->data, dp->size);
60}
61
62static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
63{
64 struct proc_dir_entry *dp = PDE(file->f_path.dentry->d_inode);
65
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
74static 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
81static 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 */
101static 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}
125core_initcall(proc_ppc64_create);