1 files changed, 135 insertions, 0 deletions

diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c
new file mode 100644
index 000000000000..f3bf016d5ee3
--- /dev/null
+++ b/fs/proc/nommu.c
@@ -0,0 +1,135 @@
+/* nommu.c: mmu-less memory info files
+ *
+ * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/errno.h>
+#include <linux/time.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/mman.h>
+#include <linux/proc_fs.h>
+#include <linux/mm.h>
+#include <linux/mmzone.h>
+#include <linux/pagemap.h>
+#include <linux/swap.h>
+#include <linux/slab.h>
+#include <linux/smp.h>
+#include <linux/seq_file.h>
+#include <linux/hugetlb.h>
+#include <linux/vmalloc.h>
+#include <asm/uaccess.h>
+#include <asm/pgtable.h>
+#include <asm/tlb.h>
+#include <asm/div64.h>
+#include "internal.h"
+
+/*
+ * display a list of all the VMAs the kernel knows about
+ * - nommu kernals have a single flat list
+ */
+static int nommu_vma_list_show(struct seq_file *m, void *v)
+{
+        struct vm_area_struct *vma;
+        unsigned long ino = 0;
+        struct file *file;
+        dev_t dev = 0;
+        int flags, len;
+
+        vma = rb_entry((struct rb_node *) v, struct vm_area_struct, vm_rb);
+
+        flags = vma->vm_flags;
+        file = vma->vm_file;
+
+        if (file) {
+                struct inode *inode = vma->vm_file->f_dentry->d_inode;
+                dev = inode->i_sb->s_dev;
+                ino = inode->i_ino;
+        }
+
+        seq_printf(m,
+                   "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
+                   vma->vm_start,
+                   vma->vm_end,
+                   flags & VM_READ ? 'r' : '-',
+                   flags & VM_WRITE ? 'w' : '-',
+                   flags & VM_EXEC ? 'x' : '-',
+                   flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
+                   vma->vm_pgoff << PAGE_SHIFT,
+                   MAJOR(dev), MINOR(dev), ino, &len);
+
+        if (file) {
+                len = 25 + sizeof(void *) * 6 - len;
+                if (len < 1)
+                        len = 1;
+                seq_printf(m, "%*c", len, ' ');
+                seq_path(m, file->f_vfsmnt, file->f_dentry, "");
+        }
+
+        seq_putc(m, '\n');
+        return 0;
+}
+
+static void *nommu_vma_list_start(struct seq_file *m, loff_t *_pos)
+{
+        struct rb_node *_rb;
+        loff_t pos = *_pos;
+        void *next = NULL;
+
+        down_read(&nommu_vma_sem);
+
+        for (_rb = rb_first(&nommu_vma_tree); _rb; _rb = rb_next(_rb)) {
+                if (pos == 0) {
+                        next = _rb;
+                        break;
+                }
+        }
+
+        return next;
+}
+
+static void nommu_vma_list_stop(struct seq_file *m, void *v)
+{
+        up_read(&nommu_vma_sem);
+}
+
+static void *nommu_vma_list_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        (*pos)++;
+        return rb_next((struct rb_node *) v);
+}
+
+static struct seq_operations proc_nommu_vma_list_seqop = {
+        .start  = nommu_vma_list_start,
+        .next   = nommu_vma_list_next,
+        .stop   = nommu_vma_list_stop,
+        .show   = nommu_vma_list_show
+};
+
+static int proc_nommu_vma_list_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &proc_nommu_vma_list_seqop);
+}
+
+static struct file_operations proc_nommu_vma_list_operations = {
+        .open    = proc_nommu_vma_list_open,
+        .read    = seq_read,
+        .llseek  = seq_lseek,
+        .release = seq_release,
+};
+
+static int __init proc_nommu_init(void)
+{
+        create_seq_entry("maps", S_IRUGO, &proc_nommu_vma_list_operations);
+        return 0;
+}
+
+module_init(proc_nommu_init);