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1da177e4 LT |
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/slab.h> | |
25 | #include <linux/smp.h> | |
26 | #include <linux/seq_file.h> | |
27 | #include <linux/hugetlb.h> | |
28 | #include <linux/vmalloc.h> | |
29 | #include <asm/uaccess.h> | |
30 | #include <asm/pgtable.h> | |
31 | #include <asm/tlb.h> | |
32 | #include <asm/div64.h> | |
33 | #include "internal.h" | |
34 | ||
35 | /* | |
8feae131 | 36 | * display a single region to a sequenced file |
1da177e4 | 37 | */ |
8feae131 | 38 | static int nommu_region_show(struct seq_file *m, struct vm_region *region) |
1da177e4 | 39 | { |
1da177e4 LT |
40 | unsigned long ino = 0; |
41 | struct file *file; | |
42 | dev_t dev = 0; | |
43 | int flags, len; | |
44 | ||
8feae131 DH |
45 | flags = region->vm_flags; |
46 | file = region->vm_file; | |
1da177e4 LT |
47 | |
48 | if (file) { | |
8feae131 | 49 | struct inode *inode = region->vm_file->f_path.dentry->d_inode; |
1da177e4 LT |
50 | dev = inode->i_sb->s_dev; |
51 | ino = inode->i_ino; | |
52 | } | |
53 | ||
54 | seq_printf(m, | |
1804dc6e | 55 | "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n", |
8feae131 DH |
56 | region->vm_start, |
57 | region->vm_end, | |
1da177e4 LT |
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', | |
8feae131 | 62 | ((loff_t)region->vm_pgoff) << PAGE_SHIFT, |
1da177e4 LT |
63 | MAJOR(dev), MINOR(dev), ino, &len); |
64 | ||
65 | if (file) { | |
66 | len = 25 + sizeof(void *) * 6 - len; | |
67 | if (len < 1) | |
68 | len = 1; | |
69 | seq_printf(m, "%*c", len, ' '); | |
c32c2f63 | 70 | seq_path(m, &file->f_path, ""); |
1da177e4 LT |
71 | } |
72 | ||
73 | seq_putc(m, '\n'); | |
74 | return 0; | |
75 | } | |
76 | ||
dbf8685c | 77 | /* |
8feae131 | 78 | * display a list of all the REGIONs the kernel knows about |
973c32be | 79 | * - nommu kernels have a single flat list |
dbf8685c | 80 | */ |
8feae131 | 81 | static int nommu_region_list_show(struct seq_file *m, void *_p) |
dbf8685c | 82 | { |
8feae131 | 83 | struct rb_node *p = _p; |
dbf8685c | 84 | |
8feae131 | 85 | return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb)); |
dbf8685c DH |
86 | } |
87 | ||
8feae131 | 88 | static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos) |
1da177e4 | 89 | { |
8feae131 | 90 | struct rb_node *p; |
1da177e4 | 91 | loff_t pos = *_pos; |
1da177e4 | 92 | |
8feae131 | 93 | down_read(&nommu_region_sem); |
1da177e4 | 94 | |
8feae131 DH |
95 | for (p = rb_first(&nommu_region_tree); p; p = rb_next(p)) |
96 | if (pos-- == 0) | |
97 | return p; | |
98 | return NULL; | |
1da177e4 LT |
99 | } |
100 | ||
8feae131 | 101 | static void nommu_region_list_stop(struct seq_file *m, void *v) |
1da177e4 | 102 | { |
8feae131 | 103 | up_read(&nommu_region_sem); |
1da177e4 LT |
104 | } |
105 | ||
8feae131 | 106 | static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos) |
1da177e4 LT |
107 | { |
108 | (*pos)++; | |
109 | return rb_next((struct rb_node *) v); | |
110 | } | |
111 | ||
88e9d34c | 112 | static const struct seq_operations proc_nommu_region_list_seqop = { |
8feae131 DH |
113 | .start = nommu_region_list_start, |
114 | .next = nommu_region_list_next, | |
115 | .stop = nommu_region_list_stop, | |
116 | .show = nommu_region_list_show | |
1da177e4 LT |
117 | }; |
118 | ||
8feae131 | 119 | static int proc_nommu_region_list_open(struct inode *inode, struct file *file) |
1da177e4 | 120 | { |
8feae131 | 121 | return seq_open(file, &proc_nommu_region_list_seqop); |
1da177e4 LT |
122 | } |
123 | ||
8feae131 DH |
124 | static const struct file_operations proc_nommu_region_list_operations = { |
125 | .open = proc_nommu_region_list_open, | |
1da177e4 LT |
126 | .read = seq_read, |
127 | .llseek = seq_lseek, | |
128 | .release = seq_release, | |
129 | }; | |
130 | ||
131 | static int __init proc_nommu_init(void) | |
132 | { | |
8feae131 | 133 | proc_create("maps", S_IRUGO, NULL, &proc_nommu_region_list_operations); |
1da177e4 LT |
134 | return 0; |
135 | } | |
136 | ||
137 | module_init(proc_nommu_init); |