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1// SPDX-License-Identifier: GPL-2.0-or-later2/* nommu.c: mmu-less memory info files3 *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 file30 */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 about70 * - nommu kernels have a single flat list71 */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_show108};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);117