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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 | /* | |
847264fb CM |
36 | * PAGE_OFFSET - the virtual address of the start of the kernel image (top |
37 | * (VA_BITS - 1)) | |
4f04d8f0 CM |
38 | * VA_BITS - the maximum number of bits for virtual addresses. |
39 | * TASK_SIZE - the maximum size of a user space task. | |
40 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. | |
41 | * The module space lives between the addresses given by TASK_SIZE | |
42 | * and PAGE_OFFSET - it must be within 128MB of the kernel text. | |
43 | */ | |
847264fb CM |
44 | #ifdef CONFIG_ARM64_64K_PAGES |
45 | #define VA_BITS (42) | |
46 | #else | |
47 | #define VA_BITS (39) | |
48 | #endif | |
49 | #define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1)) | |
4f04d8f0 CM |
50 | #define MODULES_END (PAGE_OFFSET) |
51 | #define MODULES_VADDR (MODULES_END - SZ_64M) | |
2475ff9d | 52 | #define EARLYCON_IOBASE (MODULES_VADDR - SZ_4M) |
4f04d8f0 CM |
53 | #define TASK_SIZE_64 (UL(1) << VA_BITS) |
54 | ||
55 | #ifdef CONFIG_COMPAT | |
56 | #define TASK_SIZE_32 UL(0x100000000) | |
57 | #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ | |
58 | TASK_SIZE_32 : TASK_SIZE_64) | |
59 | #else | |
60 | #define TASK_SIZE TASK_SIZE_64 | |
61 | #endif /* CONFIG_COMPAT */ | |
62 | ||
63 | #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) | |
64 | ||
65 | #if TASK_SIZE_64 > MODULES_VADDR | |
66 | #error Top of 64-bit user space clashes with start of module space | |
67 | #endif | |
68 | ||
69 | /* | |
70 | * Physical vs virtual RAM address space conversion. These are | |
71 | * private definitions which should NOT be used outside memory.h | |
72 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
73 | */ | |
74 | #define __virt_to_phys(x) (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET)) | |
75 | #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET)) | |
76 | ||
77 | /* | |
78 | * Convert a physical address to a Page Frame Number and back | |
79 | */ | |
80 | #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) | |
81 | #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) | |
82 | ||
83 | /* | |
84 | * Convert a page to/from a physical address | |
85 | */ | |
86 | #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) | |
87 | #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) | |
88 | ||
89 | /* | |
90 | * Memory types available. | |
91 | */ | |
92 | #define MT_DEVICE_nGnRnE 0 | |
93 | #define MT_DEVICE_nGnRE 1 | |
94 | #define MT_DEVICE_GRE 2 | |
95 | #define MT_NORMAL_NC 3 | |
96 | #define MT_NORMAL 4 | |
97 | ||
36311607 MZ |
98 | /* |
99 | * Memory types for Stage-2 translation | |
100 | */ | |
101 | #define MT_S2_NORMAL 0xf | |
102 | #define MT_S2_DEVICE_nGnRE 0x1 | |
103 | ||
4f04d8f0 CM |
104 | #ifndef __ASSEMBLY__ |
105 | ||
106 | extern phys_addr_t memstart_addr; | |
107 | /* PHYS_OFFSET - the physical address of the start of memory. */ | |
108 | #define PHYS_OFFSET ({ memstart_addr; }) | |
109 | ||
110 | /* | |
111 | * PFNs are used to describe any physical page; this means | |
112 | * PFN 0 == physical address 0. | |
113 | * | |
114 | * This is the PFN of the first RAM page in the kernel | |
115 | * direct-mapped view. We assume this is the first page | |
116 | * of RAM in the mem_map as well. | |
117 | */ | |
118 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
119 | ||
120 | /* | |
121 | * Note: Drivers should NOT use these. They are the wrong | |
122 | * translation for translating DMA addresses. Use the driver | |
123 | * DMA support - see dma-mapping.h. | |
124 | */ | |
125 | static inline phys_addr_t virt_to_phys(const volatile void *x) | |
126 | { | |
127 | return __virt_to_phys((unsigned long)(x)); | |
128 | } | |
129 | ||
130 | static inline void *phys_to_virt(phys_addr_t x) | |
131 | { | |
132 | return (void *)(__phys_to_virt(x)); | |
133 | } | |
134 | ||
135 | /* | |
136 | * Drivers should NOT use these either. | |
137 | */ | |
138 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
139 | #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) | |
140 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
141 | ||
142 | /* | |
143 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
144 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
145 | */ | |
146 | #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET | |
147 | ||
148 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) | |
149 | #define virt_addr_valid(kaddr) (((void *)(kaddr) >= (void *)PAGE_OFFSET) && \ | |
150 | ((void *)(kaddr) < (void *)high_memory)) | |
151 | ||
152 | #endif | |
153 | ||
154 | #include <asm-generic/memory_model.h> | |
155 | ||
156 | #endif |