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/page-def.h>
29 #include <asm/sizes.h>
32 * Size of the PCI I/O space. This must remain a power of two so that
33 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
35 #define PCI_IO_SIZE SZ_16M
38 * VMEMMAP_SIZE - allows the whole linear region to be covered by
41 #define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT))
44 * PAGE_OFFSET - the virtual address of the start of the linear map (top
46 * KIMAGE_VADDR - the virtual address of the start of the kernel image
47 * VA_BITS - the maximum number of bits for virtual addresses.
48 * VA_START - the first kernel virtual address.
50 #define VA_BITS (CONFIG_ARM64_VA_BITS)
51 #define VA_START (UL(0xffffffffffffffff) - \
52 (UL(1) << VA_BITS) + 1)
53 #define PAGE_OFFSET (UL(0xffffffffffffffff) - \
54 (UL(1) << (VA_BITS - 1)) + 1)
55 #define KIMAGE_VADDR (MODULES_END)
56 #define BPF_JIT_REGION_START (VA_START + KASAN_SHADOW_SIZE)
57 #define BPF_JIT_REGION_SIZE (SZ_128M)
58 #define BPF_JIT_REGION_END (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE)
59 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE)
60 #define MODULES_VADDR (BPF_JIT_REGION_END)
61 #define MODULES_VSIZE (SZ_128M)
62 #define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE)
63 #define PCI_IO_END (VMEMMAP_START - SZ_2M)
64 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE)
65 #define FIXADDR_TOP (PCI_IO_START - SZ_2M)
67 #define KERNEL_START _text
68 #define KERNEL_END _end
70 #ifdef CONFIG_ARM64_USER_VA_BITS_52
71 #define MAX_USER_VA_BITS 52
73 #define MAX_USER_VA_BITS VA_BITS
77 * Generic and tag-based KASAN require 1/8th and 1/16th of the kernel virtual
78 * address space for the shadow region respectively. They can bloat the stack
79 * significantly, so double the (minimum) stack size when they are in use.
82 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT))
83 #ifdef CONFIG_KASAN_EXTRA
84 #define KASAN_THREAD_SHIFT 2
86 #define KASAN_THREAD_SHIFT 1
87 #endif /* CONFIG_KASAN_EXTRA */
89 #define KASAN_SHADOW_SIZE (0)
90 #define KASAN_THREAD_SHIFT 0
93 #define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT)
96 * VMAP'd stacks are allocated at page granularity, so we must ensure that such
97 * stacks are a multiple of page size.
99 #if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT)
100 #define THREAD_SHIFT PAGE_SHIFT
102 #define THREAD_SHIFT MIN_THREAD_SHIFT
105 #if THREAD_SHIFT >= PAGE_SHIFT
106 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
109 #define THREAD_SIZE (UL(1) << THREAD_SHIFT)
112 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
113 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
116 #ifdef CONFIG_VMAP_STACK
117 #define THREAD_ALIGN (2 * THREAD_SIZE)
119 #define THREAD_ALIGN THREAD_SIZE
122 #define IRQ_STACK_SIZE THREAD_SIZE
124 #define OVERFLOW_STACK_SIZE SZ_4K
127 * Alignment of kernel segments (e.g. .text, .data).
129 #if defined(CONFIG_DEBUG_ALIGN_RODATA)
131 * 4 KB granule: 1 level 2 entry
132 * 16 KB granule: 128 level 3 entries, with contiguous bit
133 * 64 KB granule: 32 level 3 entries, with contiguous bit
135 #define SEGMENT_ALIGN SZ_2M
138 * 4 KB granule: 16 level 3 entries, with contiguous bit
139 * 16 KB granule: 4 level 3 entries, without contiguous bit
140 * 64 KB granule: 1 level 3 entry
142 #define SEGMENT_ALIGN SZ_64K
146 * Memory types available.
148 #define MT_DEVICE_nGnRnE 0
149 #define MT_DEVICE_nGnRE 1
150 #define MT_DEVICE_GRE 2
151 #define MT_NORMAL_NC 3
153 #define MT_NORMAL_WT 5
156 * Memory types for Stage-2 translation
158 #define MT_S2_NORMAL 0xf
159 #define MT_S2_DEVICE_nGnRE 0x1
162 * Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001
163 * Stage-2 enforces Normal-WB and Device-nGnRE
165 #define MT_S2_FWB_NORMAL 6
166 #define MT_S2_FWB_DEVICE_nGnRE 1
168 #ifdef CONFIG_ARM64_4K_PAGES
169 #define IOREMAP_MAX_ORDER (PUD_SHIFT)
171 #define IOREMAP_MAX_ORDER (PMD_SHIFT)
176 #include <linux/bitops.h>
177 #include <linux/mmdebug.h>
179 extern s64 memstart_addr;
180 /* PHYS_OFFSET - the physical address of the start of memory. */
181 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
183 /* the virtual base of the kernel image (minus TEXT_OFFSET) */
184 extern u64 kimage_vaddr;
186 /* the offset between the kernel virtual and physical mappings */
187 extern u64 kimage_voffset;
189 static inline unsigned long kaslr_offset(void)
191 return kimage_vaddr - KIMAGE_VADDR;
194 /* the actual size of a user virtual address */
195 extern u64 vabits_user;
198 * Allow all memory at the discovery stage. We will clip it later.
200 #define MIN_MEMBLOCK_ADDR 0
201 #define MAX_MEMBLOCK_ADDR U64_MAX
204 * PFNs are used to describe any physical page; this means
205 * PFN 0 == physical address 0.
207 * This is the PFN of the first RAM page in the kernel
208 * direct-mapped view. We assume this is the first page
209 * of RAM in the mem_map as well.
211 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
214 * When dealing with data aborts, watchpoints, or instruction traps we may end
215 * up with a tagged userland pointer. Clear the tag to get a sane pointer to
216 * pass on to access_ok(), for instance.
218 #define untagged_addr(addr) \
219 ((__typeof__(addr))sign_extend64((u64)(addr), 55))
221 #ifdef CONFIG_KASAN_SW_TAGS
222 #define __tag_shifted(tag) ((u64)(tag) << 56)
223 #define __tag_set(addr, tag) (__typeof__(addr))( \
224 ((u64)(addr) & ~__tag_shifted(0xff)) | __tag_shifted(tag))
225 #define __tag_reset(addr) untagged_addr(addr)
226 #define __tag_get(addr) (__u8)((u64)(addr) >> 56)
228 #define __tag_set(addr, tag) (addr)
229 #define __tag_reset(addr) (addr)
230 #define __tag_get(addr) 0
234 * Physical vs virtual RAM address space conversion. These are
235 * private definitions which should NOT be used outside memory.h
236 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead.
241 * The linear kernel range starts in the middle of the virtual adddress
242 * space. Testing the top bit for the start of the region is a
245 #define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1)))
247 #define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
248 #define __kimg_to_phys(addr) ((addr) - kimage_voffset)
250 #define __virt_to_phys_nodebug(x) ({ \
251 phys_addr_t __x = (phys_addr_t)(x); \
252 __is_lm_address(__x) ? __lm_to_phys(__x) : \
253 __kimg_to_phys(__x); \
256 #define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x))
258 #ifdef CONFIG_DEBUG_VIRTUAL
259 extern phys_addr_t __virt_to_phys(unsigned long x);
260 extern phys_addr_t __phys_addr_symbol(unsigned long x);
262 #define __virt_to_phys(x) __virt_to_phys_nodebug(x)
263 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x)
266 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
267 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset))
270 * Convert a page to/from a physical address
272 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
273 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys)))
276 * Note: Drivers should NOT use these. They are the wrong
277 * translation for translating DMA addresses. Use the driver
278 * DMA support - see dma-mapping.h.
280 #define virt_to_phys virt_to_phys
281 static inline phys_addr_t virt_to_phys(const volatile void *x)
283 return __virt_to_phys((unsigned long)(x));
286 #define phys_to_virt phys_to_virt
287 static inline void *phys_to_virt(phys_addr_t x)
289 return (void *)(__phys_to_virt(x));
293 * Drivers should NOT use these either.
295 #define __pa(x) __virt_to_phys((unsigned long)(x))
296 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
297 #define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x))
298 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x)))
299 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT)
300 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
301 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x))
304 * virt_to_page(k) convert a _valid_ virtual address to struct page *
305 * virt_addr_valid(k) indicates whether a virtual address is valid
307 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET)
309 #ifndef CONFIG_SPARSEMEM_VMEMMAP
310 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
311 #define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
313 #define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page))
314 #define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page))
316 #define page_to_virt(page) ({ \
317 unsigned long __addr = \
318 ((__page_to_voff(page)) | PAGE_OFFSET); \
319 __addr = __tag_set(__addr, page_kasan_tag(page)); \
323 #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START))
325 #define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \
326 + PHYS_OFFSET) >> PAGE_SHIFT)
330 #define _virt_addr_is_linear(kaddr) \
331 (__tag_reset((u64)(kaddr)) >= PAGE_OFFSET)
332 #define virt_addr_valid(kaddr) \
333 (_virt_addr_is_linear(kaddr) && _virt_addr_valid(kaddr))
335 #include <asm-generic/memory_model.h>