1 /* nommu.c: mmu-less memory info files
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
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.
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>
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>
32 #include <asm/div64.h>
36 * display a single region to a sequenced file
38 static int nommu_region_show(struct seq_file *m, struct vm_region *region)
40 unsigned long ino = 0;
45 flags = region->vm_flags;
46 file = region->vm_file;
49 struct inode *inode = region->vm_file->f_path.dentry->d_inode;
50 dev = inode->i_sb->s_dev;
55 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
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);
66 len = 25 + sizeof(void *) * 6 - len;
69 seq_printf(m, "%*c", len, ' ');
70 seq_path(m, &file->f_path, "");
78 * display a list of all the REGIONs the kernel knows about
79 * - nommu kernels have a single flat list
81 static int nommu_region_list_show(struct seq_file *m, void *_p)
83 struct rb_node *p = _p;
85 return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
88 static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
93 down_read(&nommu_region_sem);
95 for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
101 static void nommu_region_list_stop(struct seq_file *m, void *v)
103 up_read(&nommu_region_sem);
106 static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
109 return rb_next((struct rb_node *) v);
112 static 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
119 static int proc_nommu_region_list_open(struct inode *inode, struct file *file)
121 return seq_open(file, &proc_nommu_region_list_seqop);
124 static const struct file_operations proc_nommu_region_list_operations = {
125 .open = proc_nommu_region_list_open,
128 .release = seq_release,
131 static int __init proc_nommu_init(void)
133 proc_create("maps", S_IRUGO, NULL, &proc_nommu_region_list_operations);
137 module_init(proc_nommu_init);