blob: a025dd4514e78c3cec2ae8e19647a6006e3e14b5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* mem-layout.h: memory layout
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
12#ifndef _ASM_MEM_LAYOUT_H
13#define _ASM_MEM_LAYOUT_H
14
15#ifndef __ASSEMBLY__
16#define __UL(X) ((unsigned long) (X))
17#else
18#define __UL(X) (X)
19#endif
20
21/*
22 * PAGE_SHIFT determines the page size
23 */
24#define PAGE_SHIFT 14
25
26#ifndef __ASSEMBLY__
27#define PAGE_SIZE (1UL << PAGE_SHIFT)
28#else
29#define PAGE_SIZE (1 << PAGE_SHIFT)
30#endif
31
32#define PAGE_MASK (~(PAGE_SIZE-1))
33
34/*****************************************************************************/
35/*
36 * virtual memory layout from kernel's point of view
37 */
38#define PAGE_OFFSET ((unsigned long) &__page_offset)
39
40#ifdef CONFIG_MMU
41
42/* see Documentation/fujitsu/frv/mmu-layout.txt */
43#define KERNEL_LOWMEM_START __UL(0xc0000000)
44#define KERNEL_LOWMEM_END __UL(0xd0000000)
45#define VMALLOC_START __UL(0xd0000000)
46#define VMALLOC_END __UL(0xd8000000)
47#define PKMAP_BASE __UL(0xd8000000)
48#define PKMAP_END __UL(0xdc000000)
49#define KMAP_ATOMIC_SECONDARY_FRAME __UL(0xdc000000)
50#define KMAP_ATOMIC_PRIMARY_FRAME __UL(0xdd000000)
51
52#endif
53
54#define KERNEL_IO_START __UL(0xe0000000)
55
56
57/*****************************************************************************/
58/*
59 * memory layout from userspace's point of view
60 */
61#define BRK_BASE __UL(2 * 1024 * 1024 + PAGE_SIZE)
62#define STACK_TOP __UL(2 * 1024 * 1024)
63
64/* userspace process size */
65#ifdef CONFIG_MMU
66#define TASK_SIZE (PAGE_OFFSET)
67#else
68#define TASK_SIZE __UL(0xFFFFFFFFUL)
69#endif
70
71/* base of area at which unspecified mmaps will start */
72#ifdef CONFIG_BINFMT_ELF_FDPIC
73#define TASK_UNMAPPED_BASE __UL(16 * 1024 * 1024)
74#else
75#define TASK_UNMAPPED_BASE __UL(TASK_SIZE / 3)
76#endif
77
78#endif /* _ASM_MEM_LAYOUT_H */