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spaces.h
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1 /*
2  * This file is subject to the terms and conditions of the GNU General Public
3  * License. See the file "COPYING" in the main directory of this archive
4  * for more details.
5  *
6  * Copyright (C) 1994 - 1999, 2000, 03, 04 Ralf Baechle
7  * Copyright (C) 2000, 2002 Maciej W. Rozycki
8  * Copyright (C) 1990, 1999, 2000 Silicon Graphics, Inc.
9  */
10 #ifndef _ASM_MACH_GENERIC_SPACES_H
11 #define _ASM_MACH_GENERIC_SPACES_H
12 
13 #include <linux/const.h>
14 
15 /*
16  * This gives the physical RAM offset.
17  */
18 #ifndef PHYS_OFFSET
19 #define PHYS_OFFSET _AC(0, UL)
20 #endif
21 
22 #ifdef CONFIG_32BIT
23 
24 #define CAC_BASE _AC(0x80000000, UL)
25 #define IO_BASE _AC(0xa0000000, UL)
26 #define UNCAC_BASE _AC(0xa0000000, UL)
27 
28 #ifndef MAP_BASE
29 #define MAP_BASE _AC(0xc0000000, UL)
30 #endif
31 
32 /*
33  * Memory above this physical address will be considered highmem.
34  */
35 #ifndef HIGHMEM_START
36 #define HIGHMEM_START _AC(0x20000000, UL)
37 #endif
38 
39 #endif /* CONFIG_32BIT */
40 
41 #ifdef CONFIG_64BIT
42 
43 #ifndef CAC_BASE
44 #ifdef CONFIG_DMA_NONCOHERENT
45 #define CAC_BASE _AC(0x9800000000000000, UL)
46 #else
47 #define CAC_BASE _AC(0xa800000000000000, UL)
48 #endif
49 #endif
50 
51 #ifndef IO_BASE
52 #define IO_BASE _AC(0x9000000000000000, UL)
53 #endif
54 
55 #ifndef UNCAC_BASE
56 #define UNCAC_BASE _AC(0x9000000000000000, UL)
57 #endif
58 
59 #ifndef MAP_BASE
60 #define MAP_BASE _AC(0xc000000000000000, UL)
61 #endif
62 
63 /*
64  * Memory above this physical address will be considered highmem.
65  * Fixme: 59 bits is a fictive number and makes assumptions about processors
66  * in the distant future. Nobody will care for a few years :-)
67  */
68 #ifndef HIGHMEM_START
69 #define HIGHMEM_START (_AC(1, UL) << _AC(59, UL))
70 #endif
71 
72 #define TO_PHYS(x) ( ((x) & TO_PHYS_MASK))
73 #define TO_CAC(x) (CAC_BASE | ((x) & TO_PHYS_MASK))
74 #define TO_UNCAC(x) (UNCAC_BASE | ((x) & TO_PHYS_MASK))
75 
76 #endif /* CONFIG_64BIT */
77 
78 /*
79  * This handles the memory map.
80  */
81 #ifndef PAGE_OFFSET
82 #define PAGE_OFFSET (CAC_BASE + PHYS_OFFSET)
83 #endif
84 
85 #ifndef FIXADDR_TOP
86 #define FIXADDR_TOP ((unsigned long)(long)(int)0xfffe0000)
87 #endif
88 
89 #endif /* __ASM_MACH_GENERIC_SPACES_H */