xref: /linux/arch/arm64/include/asm/memory.h (revision db6d8d5fdf9537641c76ba7f32e02b4bcc600972)
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 linear map (top
59  *		 (VA_BITS - 1))
60  * KIMAGE_VADDR - the virtual address of the start of the kernel image
61  * VA_BITS - the maximum number of bits for virtual addresses.
62  * VA_START - the first kernel virtual address.
63  * TASK_SIZE - the maximum size of a user space task.
64  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
65  */
66 #define VA_BITS			(CONFIG_ARM64_VA_BITS)
67 #define VA_START		(UL(0xffffffffffffffff) << VA_BITS)
68 #define PAGE_OFFSET		(UL(0xffffffffffffffff) << (VA_BITS - 1))
69 #define KIMAGE_VADDR		(MODULES_END)
70 #define MODULES_END		(MODULES_VADDR + MODULES_VSIZE)
71 #define MODULES_VADDR		(VA_START + KASAN_SHADOW_SIZE)
72 #define MODULES_VSIZE		(SZ_128M)
73 #define VMEMMAP_START		(PAGE_OFFSET - VMEMMAP_SIZE)
74 #define PCI_IO_END		(VMEMMAP_START - SZ_2M)
75 #define PCI_IO_START		(PCI_IO_END - PCI_IO_SIZE)
76 #define FIXADDR_TOP		(PCI_IO_START - SZ_2M)
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)
83 #define TASK_SIZE_OF(tsk)	(test_tsk_thread_flag(tsk, TIF_32BIT) ? \
84 				TASK_SIZE_32 : TASK_SIZE_64)
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 
91 #define KERNEL_START      _text
92 #define KERNEL_END        _end
93 
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 
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  */
109 #define __virt_to_phys(x) ({						\
110 	phys_addr_t __x = (phys_addr_t)(x);				\
111 	__x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET :	\
112 				 (__x - kimage_voffset); })
113 
114 #define __phys_to_virt(x)	((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
115 #define __phys_to_kimg(x)	((unsigned long)((x) + kimage_voffset))
116 
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
131 #define MT_NORMAL_WT		5
132 
133 /*
134  * Memory types for Stage-2 translation
135  */
136 #define MT_S2_NORMAL		0xf
137 #define MT_S2_DEVICE_nGnRE	0x1
138 
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 
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 
153 #ifndef __ASSEMBLY__
154 
155 #include <linux/bitops.h>
156 #include <linux/mmdebug.h>
157 
158 extern s64			memstart_addr;
159 /* PHYS_OFFSET - the physical address of the start of memory. */
160 #define PHYS_OFFSET		({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
161 
162 /* the virtual base of the kernel image (minus TEXT_OFFSET) */
163 extern u64			kimage_vaddr;
164 
165 /* the offset between the kernel virtual and physical mappings */
166 extern u64			kimage_voffset;
167 
168 /*
169  * Allow all memory at the discovery stage. We will clip it later.
170  */
171 #define MIN_MEMBLOCK_ADDR	0
172 #define MAX_MEMBLOCK_ADDR	U64_MAX
173 
174 /*
175  * PFNs are used to describe any physical page; this means
176  * PFN 0 == physical address 0.
177  *
178  * This is the PFN of the first RAM page in the kernel
179  * direct-mapped view.  We assume this is the first page
180  * of RAM in the mem_map as well.
181  */
182 #define PHYS_PFN_OFFSET	(PHYS_OFFSET >> PAGE_SHIFT)
183 
184 /*
185  * Note: Drivers should NOT use these.  They are the wrong
186  * translation for translating DMA addresses.  Use the driver
187  * DMA support - see dma-mapping.h.
188  */
189 #define virt_to_phys virt_to_phys
190 static inline phys_addr_t virt_to_phys(const volatile void *x)
191 {
192 	return __virt_to_phys((unsigned long)(x));
193 }
194 
195 #define phys_to_virt phys_to_virt
196 static inline void *phys_to_virt(phys_addr_t x)
197 {
198 	return (void *)(__phys_to_virt(x));
199 }
200 
201 /*
202  * Drivers should NOT use these either.
203  */
204 #define __pa(x)			__virt_to_phys((unsigned long)(x))
205 #define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))
206 #define pfn_to_kaddr(pfn)	__va((pfn) << PAGE_SHIFT)
207 #define virt_to_pfn(x)      __phys_to_pfn(__virt_to_phys(x))
208 
209 /*
210  *  virt_to_page(k)	convert a _valid_ virtual address to struct page *
211  *  virt_addr_valid(k)	indicates whether a virtual address is valid
212  */
213 #define ARCH_PFN_OFFSET		((unsigned long)PHYS_PFN_OFFSET)
214 
215 #ifndef CONFIG_SPARSEMEM_VMEMMAP
216 #define virt_to_page(kaddr)	pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
217 #define _virt_addr_valid(kaddr)	pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
218 #else
219 #define __virt_to_pgoff(kaddr)	(((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
220 #define __page_to_voff(kaddr)	(((u64)(page) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
221 
222 #define page_to_virt(page)	((void *)((__page_to_voff(page)) | PAGE_OFFSET))
223 #define virt_to_page(vaddr)	((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))
224 
225 #define _virt_addr_valid(kaddr)	pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
226 					   + PHYS_OFFSET) >> PAGE_SHIFT)
227 #endif
228 #endif
229 
230 #define _virt_addr_is_linear(kaddr)	(((u64)(kaddr)) >= PAGE_OFFSET)
231 #define virt_addr_valid(kaddr)		(_virt_addr_is_linear(kaddr) && \
232 					 _virt_addr_valid(kaddr))
233 
234 #include <asm-generic/memory_model.h>
235 
236 #endif
237