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_path(m, &file->f_path, "");
 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 <asm/tlb.h>
 25#include <asm/div64.h>
 26#include "internal.h"
 27
 28/*
 29 * display a single region to a sequenced file
 30 */
 31static int nommu_region_show(struct seq_file *m, struct vm_region *region)
 32{
 33	unsigned long ino = 0;
 34	struct file *file;
 35	dev_t dev = 0;
 36	int flags;
 37
 38	flags = region->vm_flags;
 39	file = region->vm_file;
 40
 41	if (file) {
 42		struct inode *inode = file_inode(region->vm_file);
 43		dev = inode->i_sb->s_dev;
 44		ino = inode->i_ino;
 45	}
 46
 47	seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
 48	seq_printf(m,
 49		   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
 50		   region->vm_start,
 51		   region->vm_end,
 52		   flags & VM_READ ? 'r' : '-',
 53		   flags & VM_WRITE ? 'w' : '-',
 54		   flags & VM_EXEC ? 'x' : '-',
 55		   flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
 56		   ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
 57		   MAJOR(dev), MINOR(dev), ino);
 58
 59	if (file) {
 60		seq_pad(m, ' ');
 61		seq_path(m, file_user_path(file), "");
 62	}
 63
 64	seq_putc(m, '\n');
 65	return 0;
 66}
 67
 68/*
 69 * display a list of all the REGIONs the kernel knows about
 70 * - nommu kernels have a single flat list
 71 */
 72static int nommu_region_list_show(struct seq_file *m, void *_p)
 73{
 74	struct rb_node *p = _p;
 75
 76	return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
 77}
 78
 79static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
 80{
 81	struct rb_node *p;
 82	loff_t pos = *_pos;
 83
 84	down_read(&nommu_region_sem);
 85
 86	for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
 87		if (pos-- == 0)
 88			return p;
 89	return NULL;
 90}
 91
 92static void nommu_region_list_stop(struct seq_file *m, void *v)
 93{
 94	up_read(&nommu_region_sem);
 95}
 96
 97static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
 98{
 99	(*pos)++;
100	return rb_next((struct rb_node *) v);
101}
102
103static const struct seq_operations proc_nommu_region_list_seqop = {
104	.start	= nommu_region_list_start,
105	.next	= nommu_region_list_next,
106	.stop	= nommu_region_list_stop,
107	.show	= nommu_region_list_show
108};
109
 
 
 
 
 
 
 
 
 
 
 
 
110static int __init proc_nommu_init(void)
111{
112	proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
113	return 0;
114}
115
116fs_initcall(proc_nommu_init);