1/* mmu.c: mmu 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#include <linux/spinlock.h>
12#include <linux/vmalloc.h>
13#include <linux/highmem.h>
14#include <asm/pgtable.h>
15#include "internal.h"
16
17void get_vmalloc_info(struct vmalloc_info *vmi)
18{
19	struct vm_struct *vma;
20	unsigned long free_area_size;
21	unsigned long prev_end;
22
23	vmi->used = 0;
24
25	if (!vmlist) {
26		vmi->largest_chunk = VMALLOC_TOTAL;
27	}
28	else {
29		vmi->largest_chunk = 0;
30
31		prev_end = VMALLOC_START;
32
33		read_lock(&vmlist_lock);
34
35		for (vma = vmlist; vma; vma = vma->next) {
36			unsigned long addr = (unsigned long) vma->addr;
37
38			/*
39			 * Some archs keep another range for modules in vmlist
40			 */
41			if (addr < VMALLOC_START)
42				continue;
43			if (addr >= VMALLOC_END)
44				break;
45
46			vmi->used += vma->size;
47
48			free_area_size = addr - prev_end;
49			if (vmi->largest_chunk < free_area_size)
50				vmi->largest_chunk = free_area_size;
51
52			prev_end = vma->size + addr;
53		}
54
55		if (VMALLOC_END - prev_end > vmi->largest_chunk)
56			vmi->largest_chunk = VMALLOC_END - prev_end;
57
58		read_unlock(&vmlist_lock);
59	}
60}
61