2 * Copyright (C) 2001 Mike Corrigan & Dave Engebretsen IBM Corporation
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.
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.
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
19 #include <linux/init.h>
21 #include <linux/proc_fs.h>
22 #include <linux/kernel.h>
24 #include <asm/machdep.h>
25 #include <asm/vdso_datapage.h>
27 #include <asm/uaccess.h>
32 static loff_t page_map_seek( struct file *file, loff_t off, int whence)
40 new = file->f_pos + off;
43 new = PAGE_SIZE + off;
48 if ( new < 0 || new > PAGE_SIZE )
50 return (file->f_pos = new);
53 static ssize_t page_map_read( struct file *file, char __user *buf, size_t nbytes,
56 return simple_read_from_buffer(buf, nbytes, ppos,
57 PDE_DATA(file_inode(file)), PAGE_SIZE);
60 static int page_map_mmap( struct file *file, struct vm_area_struct *vma )
62 if ((vma->vm_end - vma->vm_start) > PAGE_SIZE)
65 remap_pfn_range(vma, vma->vm_start,
66 __pa(PDE_DATA(file_inode(file))) >> PAGE_SHIFT,
67 PAGE_SIZE, vma->vm_page_prot);
71 static const struct file_operations page_map_fops = {
72 .llseek = page_map_seek,
73 .read = page_map_read,
78 static int __init proc_ppc64_init(void)
80 struct proc_dir_entry *pde;
82 pde = proc_create_data("powerpc/systemcfg", S_IFREG|S_IRUGO, NULL,
83 &page_map_fops, vdso_data);
86 proc_set_size(pde, PAGE_SIZE);
90 __initcall(proc_ppc64_init);
92 #endif /* CONFIG_PPC64 */
95 * Create the ppc64 and ppc64/rtas directories early. This allows us to
96 * assume that they have been previously created in drivers.
98 static int __init proc_ppc64_create(void)
100 struct proc_dir_entry *root;
102 root = proc_mkdir("powerpc", NULL);
107 if (!proc_symlink("ppc64", NULL, "powerpc"))
108 pr_err("Failed to create link /proc/ppc64 -> /proc/powerpc\n");
111 if (!of_find_node_by_path("/rtas"))
114 if (!proc_mkdir("rtas", root))
117 if (!proc_symlink("rtas", NULL, "powerpc/rtas"))
122 core_initcall(proc_ppc64_create);