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Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/* 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>
24#include <linux/slab.h>
25#include <linux/smp.h>
26#include <linux/seq_file.h>
27#include <linux/hugetlb.h>
28#include <linux/vmalloc.h>
29#include <asm/uaccess.h>
30#include <asm/pgtable.h>
31#include <asm/tlb.h>
32#include <asm/div64.h>
33#include "internal.h"
34
35/*
36 * display a single region to a sequenced file
37 */
38static int nommu_region_show(struct seq_file *m, struct vm_region *region)
39{
40 unsigned long ino = 0;
41 struct file *file;
42 dev_t dev = 0;
43 int flags, len;
44
45 flags = region->vm_flags;
46 file = region->vm_file;
47
48 if (file) {
49 struct inode *inode = region->vm_file->f_path.dentry->d_inode;
50 dev = inode->i_sb->s_dev;
51 ino = inode->i_ino;
52 }
53
54 seq_printf(m,
55 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
56 region->vm_start,
57 region->vm_end,
58 flags & VM_READ ? 'r' : '-',
59 flags & VM_WRITE ? 'w' : '-',
60 flags & VM_EXEC ? 'x' : '-',
61 flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
62 ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
63 MAJOR(dev), MINOR(dev), ino, &len);
64
65 if (file) {
66 len = 25 + sizeof(void *) * 6 - len;
67 if (len < 1)
68 len = 1;
69 seq_printf(m, "%*c", len, ' ');
70 seq_path(m, &file->f_path, "");
71 }
72
73 seq_putc(m, '\n');
74 return 0;
75}
76
77/*
78 * display a list of all the REGIONs the kernel knows about
79 * - nommu kernals have a single flat list
80 */
81static int nommu_region_list_show(struct seq_file *m, void *_p)
82{
83 struct rb_node *p = _p;
84
85 return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
86}
87
88static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
89{
90 struct rb_node *p;
91 loff_t pos = *_pos;
92
93 down_read(&nommu_region_sem);
94
95 for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
96 if (pos-- == 0)
97 return p;
98 return NULL;
99}
100
101static void nommu_region_list_stop(struct seq_file *m, void *v)
102{
103 up_read(&nommu_region_sem);
104}
105
106static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
107{
108 (*pos)++;
109 return rb_next((struct rb_node *) v);
110}
111
112static struct seq_operations proc_nommu_region_list_seqop = {
113 .start = nommu_region_list_start,
114 .next = nommu_region_list_next,
115 .stop = nommu_region_list_stop,
116 .show = nommu_region_list_show
117};
118
119static int proc_nommu_region_list_open(struct inode *inode, struct file *file)
120{
121 return seq_open(file, &proc_nommu_region_list_seqop);
122}
123
124static const struct file_operations proc_nommu_region_list_operations = {
125 .open = proc_nommu_region_list_open,
126 .read = seq_read,
127 .llseek = seq_lseek,
128 .release = seq_release,
129};
130
131static int __init proc_nommu_init(void)
132{
133 proc_create("maps", S_IRUGO, NULL, &proc_nommu_region_list_operations);
134 return 0;
135}
136
137module_init(proc_nommu_init);