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1da177e4 LT |
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 | ||
dc1d60a0 DH |
34 | /* |
35 | * the slab must be aligned such that load- and store-double instructions don't | |
36 | * fault if used | |
37 | */ | |
0a2ce2ff DH |
38 | #define ARCH_KMALLOC_MINALIGN 8 |
39 | #define ARCH_SLAB_MINALIGN 8 | |
dc1d60a0 | 40 | |
1da177e4 LT |
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 | ||
0868ff7a | 49 | /* see Documentation/frv/mmu-layout.txt */ |
1da177e4 LT |
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) | |
0c93d8e4 | 70 | #define STACK_TOP_MAX __UL(0xc0000000) |
1da177e4 LT |
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 */ |