arm64: mm: restrict virt_to_page() to the linear mapping
[deliverable/linux.git] / arch / arm64 / include / asm / memory.h
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/bug.h>
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
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
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
57 /*
58 * PAGE_OFFSET - the virtual address of the start of the kernel image (top
59 * (VA_BITS - 1))
60 * VA_BITS - the maximum number of bits for virtual addresses.
61 * VA_START - the first kernel virtual address.
62 * TASK_SIZE - the maximum size of a user space task.
63 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
64 */
65 #define VA_BITS (CONFIG_ARM64_VA_BITS)
66 #define VA_START (UL(0xffffffffffffffff) << VA_BITS)
67 #define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1))
68 #define KIMAGE_VADDR (MODULES_END)
69 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
70 #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE)
71 #define MODULES_VSIZE (SZ_128M)
72 #define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE)
73 #define PCI_IO_END (VMEMMAP_START - SZ_2M)
74 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
75 #define FIXADDR_TOP (PCI_IO_START - SZ_2M)
76 #define TASK_SIZE_64 (UL(1) << VA_BITS)
77
78 #ifdef CONFIG_COMPAT
79 #define TASK_SIZE_32 UL(0x100000000)
80 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
81 TASK_SIZE_32 : TASK_SIZE_64)
82 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
83 TASK_SIZE_32 : TASK_SIZE_64)
84 #else
85 #define TASK_SIZE TASK_SIZE_64
86 #endif /* CONFIG_COMPAT */
87
88 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4))
89
90 /*
91 * The size of the KASAN shadow region. This should be 1/8th of the
92 * size of the entire kernel virtual address space.
93 */
94 #ifdef CONFIG_KASAN
95 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3))
96 #else
97 #define KASAN_SHADOW_SIZE (0)
98 #endif
99
100 /*
101 * Physical vs virtual RAM address space conversion. These are
102 * private definitions which should NOT be used outside memory.h
103 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
104 */
105 #define __virt_to_phys(x) ({ \
106 phys_addr_t __x = (phys_addr_t)(x); \
107 __x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET : \
108 (__x - kimage_voffset); })
109
110 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
111 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
112
113 /*
114 * Convert a page to/from a physical address
115 */
116 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
117 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
118
119 /*
120 * Memory types available.
121 */
122 #define MT_DEVICE_nGnRnE 0
123 #define MT_DEVICE_nGnRE 1
124 #define MT_DEVICE_GRE 2
125 #define MT_NORMAL_NC 3
126 #define MT_NORMAL 4
127 #define MT_NORMAL_WT 5
128
129 /*
130 * Memory types for Stage-2 translation
131 */
132 #define MT_S2_NORMAL 0xf
133 #define MT_S2_DEVICE_nGnRE 0x1
134
135 #ifdef CONFIG_ARM64_4K_PAGES
136 #define IOREMAP_MAX_ORDER (PUD_SHIFT)
137 #else
138 #define IOREMAP_MAX_ORDER (PMD_SHIFT)
139 #endif
140
141 #ifdef CONFIG_BLK_DEV_INITRD
142 #define __early_init_dt_declare_initrd(__start, __end) \
143 do { \
144 initrd_start = (__start); \
145 initrd_end = (__end); \
146 } while (0)
147 #endif
148
149 #ifndef __ASSEMBLY__
150
151 #include <linux/bitops.h>
152 #include <linux/mmdebug.h>
153
154 extern s64 memstart_addr;
155 /* PHYS_OFFSET - the physical address of the start of memory. */
156 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
157
158 /* the virtual base of the kernel image (minus TEXT_OFFSET) */
159 extern u64 kimage_vaddr;
160
161 /* the offset between the kernel virtual and physical mappings */
162 extern u64 kimage_voffset;
163
164 /*
165 * Allow all memory at the discovery stage. We will clip it later.
166 */
167 #define MIN_MEMBLOCK_ADDR 0
168 #define MAX_MEMBLOCK_ADDR U64_MAX
169
170 /*
171 * PFNs are used to describe any physical page; this means
172 * PFN 0 == physical address 0.
173 *
174 * This is the PFN of the first RAM page in the kernel
175 * direct-mapped view. We assume this is the first page
176 * of RAM in the mem_map as well.
177 */
178 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
179
180 /*
181 * Note: Drivers should NOT use these. They are the wrong
182 * translation for translating DMA addresses. Use the driver
183 * DMA support - see dma-mapping.h.
184 */
185 #define virt_to_phys virt_to_phys
186 static inline phys_addr_t virt_to_phys(const volatile void *x)
187 {
188 return __virt_to_phys((unsigned long)(x));
189 }
190
191 #define phys_to_virt phys_to_virt
192 static inline void *phys_to_virt(phys_addr_t x)
193 {
194 return (void *)(__phys_to_virt(x));
195 }
196
197 /*
198 * Drivers should NOT use these either.
199 */
200 #define __pa(x) __virt_to_phys((unsigned long)(x))
201 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
202 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
203 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x))
204
205 /*
206 * virt_to_page(k) convert a _valid_ virtual address to struct page *
207 * virt_addr_valid(k) indicates whether a virtual address is valid
208 */
209 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
210
211 #ifndef CONFIG_SPARSEMEM_VMEMMAP
212 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
213 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
214 #else
215 #define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
216 #define __page_to_voff(kaddr) (((u64)(page) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
217
218 #define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET))
219 #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))
220
221 #define virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
222 + PHYS_OFFSET) >> PAGE_SHIFT)
223 #endif
224 #endif
225
226 #include <asm-generic/memory_model.h>
227
228 #endif
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