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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - arch/arm64/include/asm/memory.h
2 * Based on arch/arm/include/asm/memory.h
4 * Copyright (C) 2000-2002 Russell King
5 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
19 * Note: this file should not be included by non-asm/.h files
21 #ifndef __ASM_MEMORY_H
22 #define __ASM_MEMORY_H
24 #include <linux/compiler.h>
25 #include <linux/const.h>
26 #include <linux/types.h>
28 #include <asm/sizes.h>
31 * Allow for constants defined here to be used from assembly code
32 * by prepending the UL suffix only with actual C code compilation.
34 #define UL(x) _AC(x, UL)
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.
40 #define PCI_IO_SIZE SZ_16M
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.
49 #define STRUCT_PAGE_MAX_SHIFT 6
52 * VMEMMAP_SIZE - allows the whole linear region to be covered by
55 #define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))
58 * PAGE_OFFSET - the virtual address of the start of the linear map (top
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.
66 #define VA_BITS (CONFIG_ARM64_VA_BITS)
67 #define VA_START (UL(0xffffffffffffffff) - \
68 (UL(1) << VA_BITS) + 1)
69 #define PAGE_OFFSET (UL(0xffffffffffffffff) - \
70 (UL(1) << (VA_BITS - 1)) + 1)
71 #define KIMAGE_VADDR (MODULES_END)
72 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
73 #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE)
74 #define MODULES_VSIZE (SZ_128M)
75 #define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE)
76 #define PCI_IO_END (VMEMMAP_START - SZ_2M)
77 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
78 #define FIXADDR_TOP (PCI_IO_START - SZ_2M)
79 #define TASK_SIZE_64 (UL(1) << VA_BITS)
82 #define TASK_SIZE_32 UL(0x100000000)
83 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \
84 TASK_SIZE_32 : TASK_SIZE_64)
85 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
86 TASK_SIZE_32 : TASK_SIZE_64)
88 #define TASK_SIZE TASK_SIZE_64
89 #endif /* CONFIG_COMPAT */
91 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4))
93 #define KERNEL_START _text
94 #define KERNEL_END _end
97 * The size of the KASAN shadow region. This should be 1/8th of the
98 * size of the entire kernel virtual address space.
101 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3))
103 #define KASAN_SHADOW_SIZE (0)
107 * Memory types available.
109 #define MT_DEVICE_nGnRnE 0
110 #define MT_DEVICE_nGnRE 1
111 #define MT_DEVICE_GRE 2
112 #define MT_NORMAL_NC 3
114 #define MT_NORMAL_WT 5
117 * Memory types for Stage-2 translation
119 #define MT_S2_NORMAL 0xf
120 #define MT_S2_DEVICE_nGnRE 0x1
122 #ifdef CONFIG_ARM64_4K_PAGES
123 #define IOREMAP_MAX_ORDER (PUD_SHIFT)
125 #define IOREMAP_MAX_ORDER (PMD_SHIFT)
128 #ifdef CONFIG_BLK_DEV_INITRD
129 #define __early_init_dt_declare_initrd(__start, __end) \
131 initrd_start = (__start); \
132 initrd_end = (__end); \
138 #include <linux/bitops.h>
139 #include <linux/mmdebug.h>
141 extern s64 memstart_addr
;
142 /* PHYS_OFFSET - the physical address of the start of memory. */
143 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
145 /* the virtual base of the kernel image (minus TEXT_OFFSET) */
146 extern u64 kimage_vaddr
;
148 /* the offset between the kernel virtual and physical mappings */
149 extern u64 kimage_voffset
;
151 static inline unsigned long kaslr_offset(void)
153 return kimage_vaddr
- KIMAGE_VADDR
;
157 * Allow all memory at the discovery stage. We will clip it later.
159 #define MIN_MEMBLOCK_ADDR 0
160 #define MAX_MEMBLOCK_ADDR U64_MAX
163 * PFNs are used to describe any physical page; this means
164 * PFN 0 == physical address 0.
166 * This is the PFN of the first RAM page in the kernel
167 * direct-mapped view. We assume this is the first page
168 * of RAM in the mem_map as well.
170 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
173 * Physical vs virtual RAM address space conversion. These are
174 * private definitions which should NOT be used outside memory.h
175 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
180 * The linear kernel range starts in the middle of the virtual adddress
181 * space. Testing the top bit for the start of the region is a
184 #define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1)))
186 #define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
187 #define __kimg_to_phys(addr) ((addr) - kimage_voffset)
189 #define __virt_to_phys_nodebug(x) ({ \
190 phys_addr_t __x = (phys_addr_t)(x); \
191 __is_lm_address(__x) ? __lm_to_phys(__x) : \
192 __kimg_to_phys(__x); \
195 #define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x))
197 #ifdef CONFIG_DEBUG_VIRTUAL
198 extern phys_addr_t
__virt_to_phys(unsigned long x
);
199 extern phys_addr_t
__phys_addr_symbol(unsigned long x
);
201 #define __virt_to_phys(x) __virt_to_phys_nodebug(x)
202 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
205 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
206 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
209 * Convert a page to/from a physical address
211 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
212 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
215 * Note: Drivers should NOT use these. They are the wrong
216 * translation for translating DMA addresses. Use the driver
217 * DMA support - see dma-mapping.h.
219 #define virt_to_phys virt_to_phys
220 static inline phys_addr_t
virt_to_phys(const volatile void *x
)
222 return __virt_to_phys((unsigned long)(x
));
225 #define phys_to_virt phys_to_virt
226 static inline void *phys_to_virt(phys_addr_t x
)
228 return (void *)(__phys_to_virt(x
));
232 * Drivers should NOT use these either.
234 #define __pa(x) __virt_to_phys((unsigned long)(x))
235 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
236 #define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x))
237 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
238 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
239 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
240 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
243 * virt_to_page(k) convert a _valid_ virtual address to struct page *
244 * virt_addr_valid(k) indicates whether a virtual address is valid
246 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
248 #ifndef CONFIG_SPARSEMEM_VMEMMAP
249 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
250 #define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
252 #define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
253 #define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
255 #define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET))
256 #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))
258 #define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
259 + PHYS_OFFSET) >> PAGE_SHIFT)
263 #define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET)
264 #define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \
265 _virt_addr_valid(kaddr))
267 #include <asm-generic/memory_model.h>