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4f04d8f0 CM |
1 | /* |
2 | * Based on arch/arm/include/asm/memory.h | |
3 | * | |
4 | * Copyright (C) 2000-2002 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | * Note: this file should not be included by non-asm/.h files | |
20 | */ | |
21 | #ifndef __ASM_MEMORY_H | |
22 | #define __ASM_MEMORY_H | |
23 | ||
24 | #include <linux/compiler.h> | |
25 | #include <linux/const.h> | |
26 | #include <linux/types.h> | |
27 | #include <asm/sizes.h> | |
28 | ||
29 | /* | |
30 | * Allow for constants defined here to be used from assembly code | |
31 | * by prepending the UL suffix only with actual C code compilation. | |
32 | */ | |
33 | #define UL(x) _AC(x, UL) | |
34 | ||
35 | /* | |
36 | * PAGE_OFFSET - the virtual address of the start of the kernel image. | |
37 | * VA_BITS - the maximum number of bits for virtual addresses. | |
38 | * TASK_SIZE - the maximum size of a user space task. | |
39 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. | |
40 | * The module space lives between the addresses given by TASK_SIZE | |
41 | * and PAGE_OFFSET - it must be within 128MB of the kernel text. | |
42 | */ | |
43 | #define PAGE_OFFSET UL(0xffffffc000000000) | |
44 | #define MODULES_END (PAGE_OFFSET) | |
45 | #define MODULES_VADDR (MODULES_END - SZ_64M) | |
2475ff9d | 46 | #define EARLYCON_IOBASE (MODULES_VADDR - SZ_4M) |
4f04d8f0 CM |
47 | #define VA_BITS (39) |
48 | #define TASK_SIZE_64 (UL(1) << VA_BITS) | |
49 | ||
50 | #ifdef CONFIG_COMPAT | |
51 | #define TASK_SIZE_32 UL(0x100000000) | |
52 | #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ | |
53 | TASK_SIZE_32 : TASK_SIZE_64) | |
54 | #else | |
55 | #define TASK_SIZE TASK_SIZE_64 | |
56 | #endif /* CONFIG_COMPAT */ | |
57 | ||
58 | #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) | |
59 | ||
60 | #if TASK_SIZE_64 > MODULES_VADDR | |
61 | #error Top of 64-bit user space clashes with start of module space | |
62 | #endif | |
63 | ||
64 | /* | |
65 | * Physical vs virtual RAM address space conversion. These are | |
66 | * private definitions which should NOT be used outside memory.h | |
67 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
68 | */ | |
69 | #define __virt_to_phys(x) (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET)) | |
70 | #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET)) | |
71 | ||
72 | /* | |
73 | * Convert a physical address to a Page Frame Number and back | |
74 | */ | |
75 | #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) | |
76 | #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) | |
77 | ||
78 | /* | |
79 | * Convert a page to/from a physical address | |
80 | */ | |
81 | #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) | |
82 | #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) | |
83 | ||
84 | /* | |
85 | * Memory types available. | |
86 | */ | |
87 | #define MT_DEVICE_nGnRnE 0 | |
88 | #define MT_DEVICE_nGnRE 1 | |
89 | #define MT_DEVICE_GRE 2 | |
90 | #define MT_NORMAL_NC 3 | |
91 | #define MT_NORMAL 4 | |
92 | ||
93 | #ifndef __ASSEMBLY__ | |
94 | ||
95 | extern phys_addr_t memstart_addr; | |
96 | /* PHYS_OFFSET - the physical address of the start of memory. */ | |
97 | #define PHYS_OFFSET ({ memstart_addr; }) | |
98 | ||
99 | /* | |
100 | * PFNs are used to describe any physical page; this means | |
101 | * PFN 0 == physical address 0. | |
102 | * | |
103 | * This is the PFN of the first RAM page in the kernel | |
104 | * direct-mapped view. We assume this is the first page | |
105 | * of RAM in the mem_map as well. | |
106 | */ | |
107 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
108 | ||
109 | /* | |
110 | * Note: Drivers should NOT use these. They are the wrong | |
111 | * translation for translating DMA addresses. Use the driver | |
112 | * DMA support - see dma-mapping.h. | |
113 | */ | |
114 | static inline phys_addr_t virt_to_phys(const volatile void *x) | |
115 | { | |
116 | return __virt_to_phys((unsigned long)(x)); | |
117 | } | |
118 | ||
119 | static inline void *phys_to_virt(phys_addr_t x) | |
120 | { | |
121 | return (void *)(__phys_to_virt(x)); | |
122 | } | |
123 | ||
124 | /* | |
125 | * Drivers should NOT use these either. | |
126 | */ | |
127 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
128 | #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) | |
129 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
130 | ||
131 | /* | |
132 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
133 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
134 | */ | |
135 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET | |
136 | ||
137 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
138 | #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ | |
139 | ((void *)(kaddr) < (void *)high_memory)) | |
140 | ||
141 | #endif | |
142 | ||
143 | #include <asm-generic/memory_model.h> | |
144 | ||
145 | #endif |