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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/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/*
35 * display a single region to a sequenced file
36 */
37static int nommu_region_show(struct seq_file *m, struct vm_region *region)
38{
39 unsigned long ino = 0;
40 struct file *file;
41 dev_t dev = 0;
42 int flags;
43
44 flags = region->vm_flags;
45 file = region->vm_file;
46
47 if (file) {
48 struct inode *inode = file_inode(region->vm_file);
49 dev = inode->i_sb->s_dev;
50 ino = inode->i_ino;
51 }
52
53 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
54 seq_printf(m,
55 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
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);
64
65 if (file) {
66 seq_pad(m, ' ');
67 seq_file_path(m, file, "");
68 }
69
70 seq_putc(m, '\n');
71 return 0;
72}
73
74/*
75 * display a list of all the REGIONs the kernel knows about
76 * - nommu kernels have a single flat list
77 */
78static int nommu_region_list_show(struct seq_file *m, void *_p)
79{
80 struct rb_node *p = _p;
81
82 return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
83}
84
85static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
86{
87 struct rb_node *p;
88 loff_t pos = *_pos;
89
90 down_read(&nommu_region_sem);
91
92 for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
93 if (pos-- == 0)
94 return p;
95 return NULL;
96}
97
98static void nommu_region_list_stop(struct seq_file *m, void *v)
99{
100 up_read(&nommu_region_sem);
101}
102
103static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
104{
105 (*pos)++;
106 return rb_next((struct rb_node *) v);
107}
108
109static const struct seq_operations proc_nommu_region_list_seqop = {
110 .start = nommu_region_list_start,
111 .next = nommu_region_list_next,
112 .stop = nommu_region_list_stop,
113 .show = nommu_region_list_show
114};
115
116static int proc_nommu_region_list_open(struct inode *inode, struct file *file)
117{
118 return seq_open(file, &proc_nommu_region_list_seqop);
119}
120
121static const struct file_operations proc_nommu_region_list_operations = {
122 .open = proc_nommu_region_list_open,
123 .read = seq_read,
124 .llseek = seq_lseek,
125 .release = seq_release,
126};
127
128static int __init proc_nommu_init(void)
129{
130 proc_create("maps", S_IRUGO, NULL, &proc_nommu_region_list_operations);
131 return 0;
132}
133
134fs_initcall(proc_nommu_init);
1// SPDX-License-Identifier: GPL-2.0-or-later
2/* nommu.c: mmu-less memory info files
3 *
4 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
5 * Written by David Howells (dhowells@redhat.com)
6 */
7
8#include <linux/init.h>
9#include <linux/module.h>
10#include <linux/errno.h>
11#include <linux/time.h>
12#include <linux/kernel.h>
13#include <linux/string.h>
14#include <linux/mman.h>
15#include <linux/proc_fs.h>
16#include <linux/mm.h>
17#include <linux/mmzone.h>
18#include <linux/pagemap.h>
19#include <linux/swap.h>
20#include <linux/smp.h>
21#include <linux/seq_file.h>
22#include <linux/hugetlb.h>
23#include <linux/vmalloc.h>
24#include <linux/uaccess.h>
25#include <asm/pgtable.h>
26#include <asm/tlb.h>
27#include <asm/div64.h>
28#include "internal.h"
29
30/*
31 * display a single region to a sequenced file
32 */
33static int nommu_region_show(struct seq_file *m, struct vm_region *region)
34{
35 unsigned long ino = 0;
36 struct file *file;
37 dev_t dev = 0;
38 int flags;
39
40 flags = region->vm_flags;
41 file = region->vm_file;
42
43 if (file) {
44 struct inode *inode = file_inode(region->vm_file);
45 dev = inode->i_sb->s_dev;
46 ino = inode->i_ino;
47 }
48
49 seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
50 seq_printf(m,
51 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
52 region->vm_start,
53 region->vm_end,
54 flags & VM_READ ? 'r' : '-',
55 flags & VM_WRITE ? 'w' : '-',
56 flags & VM_EXEC ? 'x' : '-',
57 flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
58 ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
59 MAJOR(dev), MINOR(dev), ino);
60
61 if (file) {
62 seq_pad(m, ' ');
63 seq_file_path(m, file, "");
64 }
65
66 seq_putc(m, '\n');
67 return 0;
68}
69
70/*
71 * display a list of all the REGIONs the kernel knows about
72 * - nommu kernels have a single flat list
73 */
74static int nommu_region_list_show(struct seq_file *m, void *_p)
75{
76 struct rb_node *p = _p;
77
78 return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
79}
80
81static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
82{
83 struct rb_node *p;
84 loff_t pos = *_pos;
85
86 down_read(&nommu_region_sem);
87
88 for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
89 if (pos-- == 0)
90 return p;
91 return NULL;
92}
93
94static void nommu_region_list_stop(struct seq_file *m, void *v)
95{
96 up_read(&nommu_region_sem);
97}
98
99static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
100{
101 (*pos)++;
102 return rb_next((struct rb_node *) v);
103}
104
105static const struct seq_operations proc_nommu_region_list_seqop = {
106 .start = nommu_region_list_start,
107 .next = nommu_region_list_next,
108 .stop = nommu_region_list_stop,
109 .show = nommu_region_list_show
110};
111
112static int __init proc_nommu_init(void)
113{
114 proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
115 return 0;
116}
117
118fs_initcall(proc_nommu_init);