1 /*
2  * arch/um/include/mem_user.h
3  *
4  * BRIEF MODULE DESCRIPTION
5  * user side memory interface for support IO memory inside user mode linux
6  *
7  * Copyright (C) 2001 RidgeRun, Inc.
8  * Author: RidgeRun, Inc.
9  *         Greg Lonnon glonnon@ridgerun.com or info@ridgerun.com
10  *
11  *  This program is free software; you can redistribute  it and/or modify it
12  *  under  the terms of  the GNU General  Public License as published by the
13  *  Free Software Foundation;  either version 2 of the  License, or (at your
14  *  option) any later version.
15  *
16  *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
17  *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
18  *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
19  *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
20  *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
21  *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
22  *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
23  *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
24  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
25  *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
26  *
27  *  You should have received a copy of the  GNU General Public License along
28  *  with this program; if not, write  to the Free Software Foundation, Inc.,
29  *  675 Mass Ave, Cambridge, MA 02139, USA.
30  */
31 
32 #ifndef _MEM_USER_H
33 #define _MEM_USER_H
34 
35 struct iomem_region {
36 	struct iomem_region *next;
37 	char *driver;
38 	int fd;
39 	int size;
40 	unsigned long phys;
41 	unsigned long virt;
42 };
43 
44 extern struct iomem_region *iomem_regions;
45 extern int iomem_size;
46 
47 #define ROUND_4M(n) ((((unsigned long) (n)) + (1 << 22)) & ~((1 << 22) - 1))
48 
49 extern unsigned long find_iomem(char *driver, unsigned long *len_out);
50 extern void mem_total_pages(unsigned long physmem, unsigned long iomem,
51 		     unsigned long highmem);
52 extern void setup_physmem(unsigned long start, unsigned long usable,
53 			  unsigned long len, unsigned long long highmem);
54 extern void map_memory(unsigned long virt, unsigned long phys,
55 		       unsigned long len, int r, int w, int x);
56 
57 #endif
58