1/* 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 * the slab must be aligned such that load- and store-double instructions don't
36 * fault if used
37 */
38#define	ARCH_DMA_MINALIGN		L1_CACHE_BYTES
39#define	ARCH_SLAB_MINALIGN		L1_CACHE_BYTES
40
41/*****************************************************************************/
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
49/* see Documentation/frv/mmu-layout.txt */
50#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)
70#define STACK_TOP_MAX			__UL(0xc0000000)
71
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 */