blob: 2947764fc0e042b997b71078246701c19cef5e46 [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
David Howellsdc1d60a2008-05-28 15:36:34 +010034/*
35 * the slab must be aligned such that load- and store-double instructions don't
36 * fault if used
37 */
David Howells0a2ce2f2008-05-28 16:49:01 +010038#define ARCH_KMALLOC_MINALIGN 8
39#define ARCH_SLAB_MINALIGN 8
David Howellsdc1d60a2008-05-28 15:36:34 +010040
Linus Torvalds1da177e2005-04-16 15:20:36 -070041/*****************************************************************************/
42/*
43 * virtual memory layout from kernel's point of view
44 */
45#define PAGE_OFFSET ((unsigned long) &__page_offset)
46
47#ifdef CONFIG_MMU
48
Adrian Bunk0868ff72008-02-03 15:54:28 +020049/* see Documentation/frv/mmu-layout.txt */
Linus Torvalds1da177e2005-04-16 15:20:36 -070050#define KERNEL_LOWMEM_START __UL(0xc0000000)
51#define KERNEL_LOWMEM_END __UL(0xd0000000)
52#define VMALLOC_START __UL(0xd0000000)
53#define VMALLOC_END __UL(0xd8000000)
54#define PKMAP_BASE __UL(0xd8000000)
55#define PKMAP_END __UL(0xdc000000)
56#define KMAP_ATOMIC_SECONDARY_FRAME __UL(0xdc000000)
57#define KMAP_ATOMIC_PRIMARY_FRAME __UL(0xdd000000)
58
59#endif
60
61#define KERNEL_IO_START __UL(0xe0000000)
62
63
64/*****************************************************************************/
65/*
66 * memory layout from userspace's point of view
67 */
68#define BRK_BASE __UL(2 * 1024 * 1024 + PAGE_SIZE)
69#define STACK_TOP __UL(2 * 1024 * 1024)
David Howells0c93d8e2008-04-10 16:10:50 +010070#define STACK_TOP_MAX __UL(0xc0000000)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071
72/* userspace process size */
73#ifdef CONFIG_MMU
74#define TASK_SIZE (PAGE_OFFSET)
75#else
76#define TASK_SIZE __UL(0xFFFFFFFFUL)
77#endif
78
79/* base of area at which unspecified mmaps will start */
80#ifdef CONFIG_BINFMT_ELF_FDPIC
81#define TASK_UNMAPPED_BASE __UL(16 * 1024 * 1024)
82#else
83#define TASK_UNMAPPED_BASE __UL(TASK_SIZE / 3)
84#endif
85
86#endif /* _ASM_MEM_LAYOUT_H */