David Brazdil | 0f672f6 | 2019-12-10 10:32:29 +0000 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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) |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 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 <linux/uaccess.h> |
Andrew Scull | b4b6d4a | 2019-01-02 15:54:55 +0000 | [diff] [blame] | 25 | #include <asm/tlb.h> |
| 26 | #include <asm/div64.h> |
| 27 | #include "internal.h" |
| 28 | |
| 29 | /* |
| 30 | * display a single region to a sequenced file |
| 31 | */ |
| 32 | static int nommu_region_show(struct seq_file *m, struct vm_region *region) |
| 33 | { |
| 34 | unsigned long ino = 0; |
| 35 | struct file *file; |
| 36 | dev_t dev = 0; |
| 37 | int flags; |
| 38 | |
| 39 | flags = region->vm_flags; |
| 40 | file = region->vm_file; |
| 41 | |
| 42 | if (file) { |
| 43 | struct inode *inode = file_inode(region->vm_file); |
| 44 | dev = inode->i_sb->s_dev; |
| 45 | ino = inode->i_ino; |
| 46 | } |
| 47 | |
| 48 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); |
| 49 | seq_printf(m, |
| 50 | "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ", |
| 51 | region->vm_start, |
| 52 | region->vm_end, |
| 53 | flags & VM_READ ? 'r' : '-', |
| 54 | flags & VM_WRITE ? 'w' : '-', |
| 55 | flags & VM_EXEC ? 'x' : '-', |
| 56 | flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p', |
| 57 | ((loff_t)region->vm_pgoff) << PAGE_SHIFT, |
| 58 | MAJOR(dev), MINOR(dev), ino); |
| 59 | |
| 60 | if (file) { |
| 61 | seq_pad(m, ' '); |
| 62 | seq_file_path(m, file, ""); |
| 63 | } |
| 64 | |
| 65 | seq_putc(m, '\n'); |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * display a list of all the REGIONs the kernel knows about |
| 71 | * - nommu kernels have a single flat list |
| 72 | */ |
| 73 | static int nommu_region_list_show(struct seq_file *m, void *_p) |
| 74 | { |
| 75 | struct rb_node *p = _p; |
| 76 | |
| 77 | return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb)); |
| 78 | } |
| 79 | |
| 80 | static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos) |
| 81 | { |
| 82 | struct rb_node *p; |
| 83 | loff_t pos = *_pos; |
| 84 | |
| 85 | down_read(&nommu_region_sem); |
| 86 | |
| 87 | for (p = rb_first(&nommu_region_tree); p; p = rb_next(p)) |
| 88 | if (pos-- == 0) |
| 89 | return p; |
| 90 | return NULL; |
| 91 | } |
| 92 | |
| 93 | static void nommu_region_list_stop(struct seq_file *m, void *v) |
| 94 | { |
| 95 | up_read(&nommu_region_sem); |
| 96 | } |
| 97 | |
| 98 | static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos) |
| 99 | { |
| 100 | (*pos)++; |
| 101 | return rb_next((struct rb_node *) v); |
| 102 | } |
| 103 | |
| 104 | static const struct seq_operations proc_nommu_region_list_seqop = { |
| 105 | .start = nommu_region_list_start, |
| 106 | .next = nommu_region_list_next, |
| 107 | .stop = nommu_region_list_stop, |
| 108 | .show = nommu_region_list_show |
| 109 | }; |
| 110 | |
| 111 | static int __init proc_nommu_init(void) |
| 112 | { |
| 113 | proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop); |
| 114 | return 0; |
| 115 | } |
| 116 | |
| 117 | fs_initcall(proc_nommu_init); |