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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> | |
a7f8de16 | 27 | #include <asm/bug.h> |
4f04d8f0 CM |
28 | #include <asm/sizes.h> |
29 | ||
30 | /* | |
31 | * Allow for constants defined here to be used from assembly code | |
32 | * by prepending the UL suffix only with actual C code compilation. | |
33 | */ | |
34 | #define UL(x) _AC(x, UL) | |
35 | ||
aa03c428 MR |
36 | /* |
37 | * Size of the PCI I/O space. This must remain a power of two so that | |
38 | * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses. | |
39 | */ | |
40 | #define PCI_IO_SIZE SZ_16M | |
41 | ||
3e1907d5 AB |
42 | /* |
43 | * Log2 of the upper bound of the size of a struct page. Used for sizing | |
44 | * the vmemmap region only, does not affect actual memory footprint. | |
45 | * We don't use sizeof(struct page) directly since taking its size here | |
46 | * requires its definition to be available at this point in the inclusion | |
47 | * chain, and it may not be a power of 2 in the first place. | |
48 | */ | |
49 | #define STRUCT_PAGE_MAX_SHIFT 6 | |
50 | ||
51 | /* | |
52 | * VMEMMAP_SIZE - allows the whole linear region to be covered by | |
53 | * a struct page array | |
54 | */ | |
55 | #define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)) | |
56 | ||
4f04d8f0 | 57 | /* |
a13e3a5b | 58 | * PAGE_OFFSET - the virtual address of the start of the linear map (top |
847264fb | 59 | * (VA_BITS - 1)) |
a13e3a5b | 60 | * KIMAGE_VADDR - the virtual address of the start of the kernel image |
4f04d8f0 | 61 | * VA_BITS - the maximum number of bits for virtual addresses. |
127db024 | 62 | * VA_START - the first kernel virtual address. |
4f04d8f0 CM |
63 | * TASK_SIZE - the maximum size of a user space task. |
64 | * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. | |
4f04d8f0 | 65 | */ |
e41ceed0 | 66 | #define VA_BITS (CONFIG_ARM64_VA_BITS) |
127db024 | 67 | #define VA_START (UL(0xffffffffffffffff) << VA_BITS) |
847264fb | 68 | #define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1)) |
f9040773 AB |
69 | #define KIMAGE_VADDR (MODULES_END) |
70 | #define MODULES_END (MODULES_VADDR + MODULES_VSIZE) | |
71 | #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE) | |
f80fb3a3 | 72 | #define MODULES_VSIZE (SZ_128M) |
3e1907d5 AB |
73 | #define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE) |
74 | #define PCI_IO_END (VMEMMAP_START - SZ_2M) | |
aa03c428 MR |
75 | #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) |
76 | #define FIXADDR_TOP (PCI_IO_START - SZ_2M) | |
4f04d8f0 CM |
77 | #define TASK_SIZE_64 (UL(1) << VA_BITS) |
78 | ||
79 | #ifdef CONFIG_COMPAT | |
80 | #define TASK_SIZE_32 UL(0x100000000) | |
81 | #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ | |
82 | TASK_SIZE_32 : TASK_SIZE_64) | |
fa2ec3ea CC |
83 | #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ |
84 | TASK_SIZE_32 : TASK_SIZE_64) | |
4f04d8f0 CM |
85 | #else |
86 | #define TASK_SIZE TASK_SIZE_64 | |
87 | #endif /* CONFIG_COMPAT */ | |
88 | ||
89 | #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) | |
90 | ||
28c72583 JM |
91 | #define KERNEL_START _text |
92 | #define KERNEL_END _end | |
93 | ||
f9040773 AB |
94 | /* |
95 | * The size of the KASAN shadow region. This should be 1/8th of the | |
96 | * size of the entire kernel virtual address space. | |
97 | */ | |
98 | #ifdef CONFIG_KASAN | |
99 | #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3)) | |
100 | #else | |
101 | #define KASAN_SHADOW_SIZE (0) | |
102 | #endif | |
103 | ||
4f04d8f0 CM |
104 | /* |
105 | * Physical vs virtual RAM address space conversion. These are | |
106 | * private definitions which should NOT be used outside memory.h | |
107 | * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. | |
108 | */ | |
ab893fb9 AB |
109 | #define __virt_to_phys(x) ({ \ |
110 | phys_addr_t __x = (phys_addr_t)(x); \ | |
8439e62a AB |
111 | __x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET : \ |
112 | (__x - kimage_voffset); }) | |
ab893fb9 | 113 | |
8439e62a | 114 | #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) |
a7f8de16 | 115 | #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) |
4f04d8f0 | 116 | |
4f04d8f0 CM |
117 | /* |
118 | * Convert a page to/from a physical address | |
119 | */ | |
120 | #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) | |
121 | #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) | |
122 | ||
123 | /* | |
124 | * Memory types available. | |
125 | */ | |
126 | #define MT_DEVICE_nGnRnE 0 | |
127 | #define MT_DEVICE_nGnRE 1 | |
128 | #define MT_DEVICE_GRE 2 | |
129 | #define MT_NORMAL_NC 3 | |
130 | #define MT_NORMAL 4 | |
8d446c86 | 131 | #define MT_NORMAL_WT 5 |
4f04d8f0 | 132 | |
36311607 MZ |
133 | /* |
134 | * Memory types for Stage-2 translation | |
135 | */ | |
136 | #define MT_S2_NORMAL 0xf | |
137 | #define MT_S2_DEVICE_nGnRE 0x1 | |
138 | ||
324420bf AB |
139 | #ifdef CONFIG_ARM64_4K_PAGES |
140 | #define IOREMAP_MAX_ORDER (PUD_SHIFT) | |
141 | #else | |
142 | #define IOREMAP_MAX_ORDER (PMD_SHIFT) | |
143 | #endif | |
144 | ||
a89dea58 AB |
145 | #ifdef CONFIG_BLK_DEV_INITRD |
146 | #define __early_init_dt_declare_initrd(__start, __end) \ | |
147 | do { \ | |
148 | initrd_start = (__start); \ | |
149 | initrd_end = (__end); \ | |
150 | } while (0) | |
151 | #endif | |
152 | ||
4f04d8f0 CM |
153 | #ifndef __ASSEMBLY__ |
154 | ||
8439e62a | 155 | #include <linux/bitops.h> |
a92405f0 AB |
156 | #include <linux/mmdebug.h> |
157 | ||
020d044f | 158 | extern s64 memstart_addr; |
4f04d8f0 | 159 | /* PHYS_OFFSET - the physical address of the start of memory. */ |
a92405f0 | 160 | #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) |
a7f8de16 | 161 | |
f80fb3a3 AB |
162 | /* the virtual base of the kernel image (minus TEXT_OFFSET) */ |
163 | extern u64 kimage_vaddr; | |
164 | ||
a7f8de16 AB |
165 | /* the offset between the kernel virtual and physical mappings */ |
166 | extern u64 kimage_voffset; | |
4f04d8f0 | 167 | |
7ede8665 AP |
168 | static inline unsigned long kaslr_offset(void) |
169 | { | |
170 | return kimage_vaddr - KIMAGE_VADDR; | |
171 | } | |
172 | ||
34ba2c42 | 173 | /* |
a7f8de16 | 174 | * Allow all memory at the discovery stage. We will clip it later. |
34ba2c42 | 175 | */ |
a7f8de16 AB |
176 | #define MIN_MEMBLOCK_ADDR 0 |
177 | #define MAX_MEMBLOCK_ADDR U64_MAX | |
34ba2c42 | 178 | |
4f04d8f0 CM |
179 | /* |
180 | * PFNs are used to describe any physical page; this means | |
181 | * PFN 0 == physical address 0. | |
182 | * | |
183 | * This is the PFN of the first RAM page in the kernel | |
184 | * direct-mapped view. We assume this is the first page | |
185 | * of RAM in the mem_map as well. | |
186 | */ | |
187 | #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) | |
188 | ||
189 | /* | |
190 | * Note: Drivers should NOT use these. They are the wrong | |
191 | * translation for translating DMA addresses. Use the driver | |
192 | * DMA support - see dma-mapping.h. | |
193 | */ | |
09a57239 | 194 | #define virt_to_phys virt_to_phys |
4f04d8f0 CM |
195 | static inline phys_addr_t virt_to_phys(const volatile void *x) |
196 | { | |
197 | return __virt_to_phys((unsigned long)(x)); | |
198 | } | |
199 | ||
09a57239 | 200 | #define phys_to_virt phys_to_virt |
4f04d8f0 CM |
201 | static inline void *phys_to_virt(phys_addr_t x) |
202 | { | |
203 | return (void *)(__phys_to_virt(x)); | |
204 | } | |
205 | ||
206 | /* | |
207 | * Drivers should NOT use these either. | |
208 | */ | |
209 | #define __pa(x) __virt_to_phys((unsigned long)(x)) | |
210 | #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) | |
211 | #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) | |
1f53ba6e | 212 | #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x)) |
4f04d8f0 CM |
213 | |
214 | /* | |
215 | * virt_to_page(k) convert a _valid_ virtual address to struct page * | |
216 | * virt_addr_valid(k) indicates whether a virtual address is valid | |
217 | */ | |
5fd6690c | 218 | #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) |
4f04d8f0 | 219 | |
9f287591 | 220 | #ifndef CONFIG_SPARSEMEM_VMEMMAP |
4f04d8f0 | 221 | #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) |
ca219452 | 222 | #define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) |
9f287591 AB |
223 | #else |
224 | #define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page)) | |
1c8a946b | 225 | #define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page)) |
9f287591 AB |
226 | |
227 | #define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET)) | |
228 | #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START)) | |
4f04d8f0 | 229 | |
ca219452 | 230 | #define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \ |
9f287591 AB |
231 | + PHYS_OFFSET) >> PAGE_SHIFT) |
232 | #endif | |
4f04d8f0 CM |
233 | #endif |
234 | ||
ca219452 LA |
235 | #define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET) |
236 | #define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \ | |
237 | _virt_addr_valid(kaddr)) | |
238 | ||
4f04d8f0 CM |
239 | #include <asm-generic/memory_model.h> |
240 | ||
241 | #endif |