| xj | b04a402 | 2021-11-25 15:01:52 +0800 | [diff] [blame] | 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 <linux/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 | */ |
| 37 | static 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 | */ |
| 78 | static 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 | |
| 85 | static 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 | |
| 98 | static void nommu_region_list_stop(struct seq_file *m, void *v) |
| 99 | { |
| 100 | up_read(&nommu_region_sem); |
| 101 | } |
| 102 | |
| 103 | static 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 | |
| 109 | static 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 | |
| 116 | static int __init proc_nommu_init(void) |
| 117 | { |
| 118 | proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop); |
| 119 | return 0; |
| 120 | } |
| 121 | |
| 122 | fs_initcall(proc_nommu_init); |