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/config.h>
20 #include <linux/init.h>
22 #include <linux/proc_fs.h>
23 #include <linux/slab.h>
24 #include <linux/kernel.h>
26 #include <asm/machdep.h>
27 #include <asm/vdso_datapage.h>
29 #include <asm/uaccess.h>
32 static loff_t
page_map_seek( struct file
*file
, loff_t off
, int whence
);
33 static ssize_t
page_map_read( struct file
*file
, char __user
*buf
, size_t nbytes
,
35 static int page_map_mmap( struct file
*file
, struct vm_area_struct
*vma
);
37 static struct file_operations page_map_fops
= {
38 .llseek
= page_map_seek
,
39 .read
= page_map_read
,
44 * Create the ppc64 and ppc64/rtas directories early. This allows us to
45 * assume that they have been previously created in drivers.
47 static int __init
proc_ppc64_create(void)
49 struct proc_dir_entry
*root
;
51 root
= proc_mkdir("ppc64", NULL
);
55 if (!machine_is(pseries
) && !machine_is(cell
))
58 if (!proc_mkdir("rtas", root
))
61 if (!proc_symlink("rtas", NULL
, "ppc64/rtas"))
66 core_initcall(proc_ppc64_create
);
68 static int __init
proc_ppc64_init(void)
70 struct proc_dir_entry
*pde
;
72 pde
= create_proc_entry("ppc64/systemcfg", S_IFREG
|S_IRUGO
, NULL
);
76 pde
->data
= vdso_data
;
77 pde
->size
= PAGE_SIZE
;
78 pde
->proc_fops
= &page_map_fops
;
82 __initcall(proc_ppc64_init
);
84 static loff_t
page_map_seek( struct file
*file
, loff_t off
, int whence
)
87 struct proc_dir_entry
*dp
= PDE(file
->f_dentry
->d_inode
);
94 new = file
->f_pos
+ off
;
102 if ( new < 0 || new > dp
->size
)
104 return (file
->f_pos
= new);
107 static ssize_t
page_map_read( struct file
*file
, char __user
*buf
, size_t nbytes
,
110 struct proc_dir_entry
*dp
= PDE(file
->f_dentry
->d_inode
);
111 return simple_read_from_buffer(buf
, nbytes
, ppos
, dp
->data
, dp
->size
);
114 static int page_map_mmap( struct file
*file
, struct vm_area_struct
*vma
)
116 struct proc_dir_entry
*dp
= PDE(file
->f_dentry
->d_inode
);
118 vma
->vm_flags
|= VM_SHM
| VM_LOCKED
;
120 if ((vma
->vm_end
- vma
->vm_start
) > dp
->size
)
123 remap_pfn_range(vma
, vma
->vm_start
, __pa(dp
->data
) >> PAGE_SHIFT
,
124 dp
->size
, vma
->vm_page_prot
);