1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0-or-later
2*4882a593Smuzhiyun /* nommu.c: mmu-less memory info files
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
5*4882a593Smuzhiyun * Written by David Howells (dhowells@redhat.com)
6*4882a593Smuzhiyun */
7*4882a593Smuzhiyun
8*4882a593Smuzhiyun #include <linux/init.h>
9*4882a593Smuzhiyun #include <linux/module.h>
10*4882a593Smuzhiyun #include <linux/errno.h>
11*4882a593Smuzhiyun #include <linux/time.h>
12*4882a593Smuzhiyun #include <linux/kernel.h>
13*4882a593Smuzhiyun #include <linux/string.h>
14*4882a593Smuzhiyun #include <linux/mman.h>
15*4882a593Smuzhiyun #include <linux/proc_fs.h>
16*4882a593Smuzhiyun #include <linux/mm.h>
17*4882a593Smuzhiyun #include <linux/mmzone.h>
18*4882a593Smuzhiyun #include <linux/pagemap.h>
19*4882a593Smuzhiyun #include <linux/swap.h>
20*4882a593Smuzhiyun #include <linux/smp.h>
21*4882a593Smuzhiyun #include <linux/seq_file.h>
22*4882a593Smuzhiyun #include <linux/hugetlb.h>
23*4882a593Smuzhiyun #include <linux/vmalloc.h>
24*4882a593Smuzhiyun #include <linux/uaccess.h>
25*4882a593Smuzhiyun #include <asm/tlb.h>
26*4882a593Smuzhiyun #include <asm/div64.h>
27*4882a593Smuzhiyun #include "internal.h"
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun /*
30*4882a593Smuzhiyun * display a single region to a sequenced file
31*4882a593Smuzhiyun */
nommu_region_show(struct seq_file * m,struct vm_region * region)32*4882a593Smuzhiyun static int nommu_region_show(struct seq_file *m, struct vm_region *region)
33*4882a593Smuzhiyun {
34*4882a593Smuzhiyun unsigned long ino = 0;
35*4882a593Smuzhiyun struct file *file;
36*4882a593Smuzhiyun dev_t dev = 0;
37*4882a593Smuzhiyun int flags;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun flags = region->vm_flags;
40*4882a593Smuzhiyun file = region->vm_file;
41*4882a593Smuzhiyun
42*4882a593Smuzhiyun if (file) {
43*4882a593Smuzhiyun struct inode *inode = file_inode(region->vm_file);
44*4882a593Smuzhiyun dev = inode->i_sb->s_dev;
45*4882a593Smuzhiyun ino = inode->i_ino;
46*4882a593Smuzhiyun }
47*4882a593Smuzhiyun
48*4882a593Smuzhiyun seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
49*4882a593Smuzhiyun seq_printf(m,
50*4882a593Smuzhiyun "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
51*4882a593Smuzhiyun region->vm_start,
52*4882a593Smuzhiyun region->vm_end,
53*4882a593Smuzhiyun flags & VM_READ ? 'r' : '-',
54*4882a593Smuzhiyun flags & VM_WRITE ? 'w' : '-',
55*4882a593Smuzhiyun flags & VM_EXEC ? 'x' : '-',
56*4882a593Smuzhiyun flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
57*4882a593Smuzhiyun ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
58*4882a593Smuzhiyun MAJOR(dev), MINOR(dev), ino);
59*4882a593Smuzhiyun
60*4882a593Smuzhiyun if (file) {
61*4882a593Smuzhiyun seq_pad(m, ' ');
62*4882a593Smuzhiyun seq_file_path(m, file, "");
63*4882a593Smuzhiyun }
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun seq_putc(m, '\n');
66*4882a593Smuzhiyun return 0;
67*4882a593Smuzhiyun }
68*4882a593Smuzhiyun
69*4882a593Smuzhiyun /*
70*4882a593Smuzhiyun * display a list of all the REGIONs the kernel knows about
71*4882a593Smuzhiyun * - nommu kernels have a single flat list
72*4882a593Smuzhiyun */
nommu_region_list_show(struct seq_file * m,void * _p)73*4882a593Smuzhiyun static int nommu_region_list_show(struct seq_file *m, void *_p)
74*4882a593Smuzhiyun {
75*4882a593Smuzhiyun struct rb_node *p = _p;
76*4882a593Smuzhiyun
77*4882a593Smuzhiyun return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
78*4882a593Smuzhiyun }
79*4882a593Smuzhiyun
nommu_region_list_start(struct seq_file * m,loff_t * _pos)80*4882a593Smuzhiyun static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
81*4882a593Smuzhiyun {
82*4882a593Smuzhiyun struct rb_node *p;
83*4882a593Smuzhiyun loff_t pos = *_pos;
84*4882a593Smuzhiyun
85*4882a593Smuzhiyun down_read(&nommu_region_sem);
86*4882a593Smuzhiyun
87*4882a593Smuzhiyun for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
88*4882a593Smuzhiyun if (pos-- == 0)
89*4882a593Smuzhiyun return p;
90*4882a593Smuzhiyun return NULL;
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
nommu_region_list_stop(struct seq_file * m,void * v)93*4882a593Smuzhiyun static void nommu_region_list_stop(struct seq_file *m, void *v)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun up_read(&nommu_region_sem);
96*4882a593Smuzhiyun }
97*4882a593Smuzhiyun
nommu_region_list_next(struct seq_file * m,void * v,loff_t * pos)98*4882a593Smuzhiyun static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
99*4882a593Smuzhiyun {
100*4882a593Smuzhiyun (*pos)++;
101*4882a593Smuzhiyun return rb_next((struct rb_node *) v);
102*4882a593Smuzhiyun }
103*4882a593Smuzhiyun
104*4882a593Smuzhiyun static const struct seq_operations proc_nommu_region_list_seqop = {
105*4882a593Smuzhiyun .start = nommu_region_list_start,
106*4882a593Smuzhiyun .next = nommu_region_list_next,
107*4882a593Smuzhiyun .stop = nommu_region_list_stop,
108*4882a593Smuzhiyun .show = nommu_region_list_show
109*4882a593Smuzhiyun };
110*4882a593Smuzhiyun
proc_nommu_init(void)111*4882a593Smuzhiyun static int __init proc_nommu_init(void)
112*4882a593Smuzhiyun {
113*4882a593Smuzhiyun proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
114*4882a593Smuzhiyun return 0;
115*4882a593Smuzhiyun }
116*4882a593Smuzhiyun
117*4882a593Smuzhiyun fs_initcall(proc_nommu_init);
118