projects / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 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 ([email protected]) | |
| 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 | /* | |
| 36 | * display a list of all the VMAs the kernel knows about | |
| 37 | * - nommu kernals have a single flat list | |
| 38 | */ | |
| 39 | static int nommu_vma_list_show(struct seq_file *m, void *v) | |
| 40 | { | |
| 41 | struct vm_area_struct *vma; | |
| 42 | unsigned long ino = 0; | |
| 43 | struct file *file; | |
| 44 | dev_t dev = 0; | |
| 45 | int flags, len; | |
| 46 | ||
| 47 | vma = rb_entry((struct rb_node *) v, struct vm_area_struct, vm_rb); | |
| 48 | ||
| 49 | flags = vma->vm_flags; | |
| 50 | file = vma->vm_file; | |
| 51 | ||
| 52 | if (file) { | |
| 53 | struct inode *inode = vma->vm_file->f_dentry->d_inode; | |
| 54 | dev = inode->i_sb->s_dev; | |
| 55 | ino = inode->i_ino; | |
| 56 | } | |
| 57 | ||
| 58 | seq_printf(m, | |
| 59 | "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n", | |
| 60 | vma->vm_start, | |
| 61 | vma->vm_end, | |
| 62 | flags & VM_READ ? 'r' : '-', | |
| 63 | flags & VM_WRITE ? 'w' : '-', | |
| 64 | flags & VM_EXEC ? 'x' : '-', | |
| 65 | flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p', | |
| 66 | vma->vm_pgoff << PAGE_SHIFT, | |
| 67 | MAJOR(dev), MINOR(dev), ino, &len); | |
| 68 | ||
| 69 | if (file) { | |
| 70 | len = 25 + sizeof(void *) * 6 - len; | |
| 71 | if (len < 1) | |
| 72 | len = 1; | |
| 73 | seq_printf(m, "%*c", len, ' '); | |
| 74 | seq_path(m, file->f_vfsmnt, file->f_dentry, ""); | |
| 75 | } | |
| 76 | ||
| 77 | seq_putc(m, '\n'); | |
| 78 | return 0; | |
| 79 | } | |
| 80 | ||
| 81 | static void *nommu_vma_list_start(struct seq_file *m, loff_t *_pos) | |
| 82 | { | |
| 83 | struct rb_node *_rb; | |
| 84 | loff_t pos = *_pos; | |
| 85 | void *next = NULL; | |
| 86 | ||
| 87 | down_read(&nommu_vma_sem); | |
| 88 | ||
| 89 | for (_rb = rb_first(&nommu_vma_tree); _rb; _rb = rb_next(_rb)) { | |
| 90 | if (pos == 0) { | |
| 91 | next = _rb; | |
| 92 | break; | |
| 93 | } | |
| b65574fe | 94 | pos--; |
| 1da177e4 LT |
95 | } |
| 96 | ||
| 97 | return next; | |
| 98 | } | |
| 99 | ||
| 100 | static void nommu_vma_list_stop(struct seq_file *m, void *v) | |
| 101 | { | |
| 102 | up_read(&nommu_vma_sem); | |
| 103 | } | |
| 104 | ||
| 105 | static void *nommu_vma_list_next(struct seq_file *m, void *v, loff_t *pos) | |
| 106 | { | |
| 107 | (*pos)++; | |
| 108 | return rb_next((struct rb_node *) v); | |
| 109 | } | |
| 110 | ||
| 111 | static struct seq_operations proc_nommu_vma_list_seqop = { | |
| 112 | .start = nommu_vma_list_start, | |
| 113 | .next = nommu_vma_list_next, | |
| 114 | .stop = nommu_vma_list_stop, | |
| 115 | .show = nommu_vma_list_show | |
| 116 | }; | |
| 117 | ||
| 118 | static int proc_nommu_vma_list_open(struct inode *inode, struct file *file) | |
| 119 | { | |
| 120 | return seq_open(file, &proc_nommu_vma_list_seqop); | |
| 121 | } | |
| 122 | ||
| 123 | static struct file_operations proc_nommu_vma_list_operations = { | |
| 124 | .open = proc_nommu_vma_list_open, | |
| 125 | .read = seq_read, | |
| 126 | .llseek = seq_lseek, | |
| 127 | .release = seq_release, | |
| 128 | }; | |
| 129 | ||
| 130 | static int __init proc_nommu_init(void) | |
| 131 | { | |
| 132 | create_seq_entry("maps", S_IRUGO, &proc_nommu_vma_list_operations); | |
| 133 | return 0; | |
| 134 | } | |
| 135 | ||
| 136 | module_init(proc_nommu_init); |