Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
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) | |
1da177e4 LT |
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> | |
1da177e4 LT |
20 | #include <linux/smp.h> |
21 | #include <linux/seq_file.h> | |
22 | #include <linux/hugetlb.h> | |
23 | #include <linux/vmalloc.h> | |
7c0f6ba6 | 24 | #include <linux/uaccess.h> |
1da177e4 LT |
25 | #include <asm/pgtable.h> |
26 | #include <asm/tlb.h> | |
27 | #include <asm/div64.h> | |
28 | #include "internal.h" | |
29 | ||
30 | /* | |
8feae131 | 31 | * display a single region to a sequenced file |
1da177e4 | 32 | */ |
8feae131 | 33 | static int nommu_region_show(struct seq_file *m, struct vm_region *region) |
1da177e4 | 34 | { |
1da177e4 LT |
35 | unsigned long ino = 0; |
36 | struct file *file; | |
37 | dev_t dev = 0; | |
652586df | 38 | int flags; |
1da177e4 | 39 | |
8feae131 DH |
40 | flags = region->vm_flags; |
41 | file = region->vm_file; | |
1da177e4 LT |
42 | |
43 | if (file) { | |
496ad9aa | 44 | struct inode *inode = file_inode(region->vm_file); |
1da177e4 LT |
45 | dev = inode->i_sb->s_dev; |
46 | ino = inode->i_ino; | |
47 | } | |
48 | ||
652586df | 49 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); |
1da177e4 | 50 | seq_printf(m, |
652586df | 51 | "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", |
8feae131 DH |
52 | region->vm_start, |
53 | region->vm_end, | |
1da177e4 LT |
54 | flags & VM_READ ? 'r' : '-', |
55 | flags & VM_WRITE ? 'w' : '-', | |
56 | flags & VM_EXEC ? 'x' : '-', | |
57 | flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p', | |
8feae131 | 58 | ((loff_t)region->vm_pgoff) << PAGE_SHIFT, |
652586df | 59 | MAJOR(dev), MINOR(dev), ino); |
1da177e4 LT |
60 | |
61 | if (file) { | |
652586df | 62 | seq_pad(m, ' '); |
2726d566 | 63 | seq_file_path(m, file, ""); |
1da177e4 LT |
64 | } |
65 | ||
66 | seq_putc(m, '\n'); | |
67 | return 0; | |
68 | } | |
69 | ||
dbf8685c | 70 | /* |
8feae131 | 71 | * display a list of all the REGIONs the kernel knows about |
973c32be | 72 | * - nommu kernels have a single flat list |
dbf8685c | 73 | */ |
8feae131 | 74 | static int nommu_region_list_show(struct seq_file *m, void *_p) |
dbf8685c | 75 | { |
8feae131 | 76 | struct rb_node *p = _p; |
dbf8685c | 77 | |
8feae131 | 78 | return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb)); |
dbf8685c DH |
79 | } |
80 | ||
8feae131 | 81 | static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos) |
1da177e4 | 82 | { |
8feae131 | 83 | struct rb_node *p; |
1da177e4 | 84 | loff_t pos = *_pos; |
1da177e4 | 85 | |
8feae131 | 86 | down_read(&nommu_region_sem); |
1da177e4 | 87 | |
8feae131 DH |
88 | for (p = rb_first(&nommu_region_tree); p; p = rb_next(p)) |
89 | if (pos-- == 0) | |
90 | return p; | |
91 | return NULL; | |
1da177e4 LT |
92 | } |
93 | ||
8feae131 | 94 | static void nommu_region_list_stop(struct seq_file *m, void *v) |
1da177e4 | 95 | { |
8feae131 | 96 | up_read(&nommu_region_sem); |
1da177e4 LT |
97 | } |
98 | ||
8feae131 | 99 | static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos) |
1da177e4 LT |
100 | { |
101 | (*pos)++; | |
102 | return rb_next((struct rb_node *) v); | |
103 | } | |
104 | ||
88e9d34c | 105 | static const struct seq_operations proc_nommu_region_list_seqop = { |
8feae131 DH |
106 | .start = nommu_region_list_start, |
107 | .next = nommu_region_list_next, | |
108 | .stop = nommu_region_list_stop, | |
109 | .show = nommu_region_list_show | |
1da177e4 LT |
110 | }; |
111 | ||
1da177e4 LT |
112 | static int __init proc_nommu_init(void) |
113 | { | |
fddda2b7 | 114 | proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop); |
1da177e4 LT |
115 | return 0; |
116 | } | |
117 | ||
abaf3787 | 118 | fs_initcall(proc_nommu_init); |