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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* nommu.c: mmu-less memory info files
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/errno.h>
15#include <linux/time.h>
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/mman.h>
19#include <linux/proc_fs.h>
20#include <linux/mm.h>
21#include <linux/mmzone.h>
22#include <linux/pagemap.h>
23#include <linux/swap.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include <linux/smp.h>
25#include <linux/seq_file.h>
26#include <linux/hugetlb.h>
27#include <linux/vmalloc.h>
28#include <asm/uaccess.h>
29#include <asm/pgtable.h>
30#include <asm/tlb.h>
31#include <asm/div64.h>
32#include "internal.h"
33
34/*
David Howells8feae132009-01-08 12:04:47 +000035 * display a single region to a sequenced file
Linus Torvalds1da177e2005-04-16 15:20:36 -070036 */
David Howells8feae132009-01-08 12:04:47 +000037static int nommu_region_show(struct seq_file *m, struct vm_region *region)
Linus Torvalds1da177e2005-04-16 15:20:36 -070038{
Linus Torvalds1da177e2005-04-16 15:20:36 -070039 unsigned long ino = 0;
40 struct file *file;
41 dev_t dev = 0;
Tetsuo Handa652586d2013-11-14 14:31:57 -080042 int flags;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
David Howells8feae132009-01-08 12:04:47 +000044 flags = region->vm_flags;
45 file = region->vm_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47 if (file) {
Al Viro496ad9a2013-01-23 17:07:38 -050048 struct inode *inode = file_inode(region->vm_file);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049 dev = inode->i_sb->s_dev;
50 ino = inode->i_ino;
51 }
52
Tetsuo Handa652586d2013-11-14 14:31:57 -080053 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 seq_printf(m,
Tetsuo Handa652586d2013-11-14 14:31:57 -080055 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
David Howells8feae132009-01-08 12:04:47 +000056 region->vm_start,
57 region->vm_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 flags & VM_READ ? 'r' : '-',
59 flags & VM_WRITE ? 'w' : '-',
60 flags & VM_EXEC ? 'x' : '-',
61 flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
David Howells8feae132009-01-08 12:04:47 +000062 ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
Tetsuo Handa652586d2013-11-14 14:31:57 -080063 MAJOR(dev), MINOR(dev), ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65 if (file) {
Tetsuo Handa652586d2013-11-14 14:31:57 -080066 seq_pad(m, ' ');
Jan Blunckc32c2f62008-02-14 19:38:43 -080067 seq_path(m, &file->f_path, "");
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 }
69
70 seq_putc(m, '\n');
71 return 0;
72}
73
David Howellsdbf86852006-09-27 01:50:19 -070074/*
David Howells8feae132009-01-08 12:04:47 +000075 * display a list of all the REGIONs the kernel knows about
Uwe Kleine-Koenig973c32b2009-01-12 23:35:47 +010076 * - nommu kernels have a single flat list
David Howellsdbf86852006-09-27 01:50:19 -070077 */
David Howells8feae132009-01-08 12:04:47 +000078static int nommu_region_list_show(struct seq_file *m, void *_p)
David Howellsdbf86852006-09-27 01:50:19 -070079{
David Howells8feae132009-01-08 12:04:47 +000080 struct rb_node *p = _p;
David Howellsdbf86852006-09-27 01:50:19 -070081
David Howells8feae132009-01-08 12:04:47 +000082 return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
David Howellsdbf86852006-09-27 01:50:19 -070083}
84
David Howells8feae132009-01-08 12:04:47 +000085static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
David Howells8feae132009-01-08 12:04:47 +000087 struct rb_node *p;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 loff_t pos = *_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089
David Howells8feae132009-01-08 12:04:47 +000090 down_read(&nommu_region_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
David Howells8feae132009-01-08 12:04:47 +000092 for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
93 if (pos-- == 0)
94 return p;
95 return NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
David Howells8feae132009-01-08 12:04:47 +000098static void nommu_region_list_stop(struct seq_file *m, void *v)
Linus Torvalds1da177e2005-04-16 15:20:36 -070099{
David Howells8feae132009-01-08 12:04:47 +0000100 up_read(&nommu_region_sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
102
David Howells8feae132009-01-08 12:04:47 +0000103static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
105 (*pos)++;
106 return rb_next((struct rb_node *) v);
107}
108
James Morris88e9d342009-09-22 16:43:43 -0700109static const struct seq_operations proc_nommu_region_list_seqop = {
David Howells8feae132009-01-08 12:04:47 +0000110 .start = nommu_region_list_start,
111 .next = nommu_region_list_next,
112 .stop = nommu_region_list_stop,
113 .show = nommu_region_list_show
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114};
115
David Howells8feae132009-01-08 12:04:47 +0000116static int proc_nommu_region_list_open(struct inode *inode, struct file *file)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117{
David Howells8feae132009-01-08 12:04:47 +0000118 return seq_open(file, &proc_nommu_region_list_seqop);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
David Howells8feae132009-01-08 12:04:47 +0000121static const struct file_operations proc_nommu_region_list_operations = {
122 .open = proc_nommu_region_list_open,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 .read = seq_read,
124 .llseek = seq_lseek,
125 .release = seq_release,
126};
127
128static int __init proc_nommu_init(void)
129{
David Howells8feae132009-01-08 12:04:47 +0000130 proc_create("maps", S_IRUGO, NULL, &proc_nommu_region_list_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 return 0;
132}
133
134module_init(proc_nommu_init);