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/page-def.h> 29 #include <asm/sizes.h> 30 31 /* 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. 34 */ 35 #define PCI_IO_SIZE SZ_16M 36 37 /* 38 * VMEMMAP_SIZE - allows the whole linear region to be covered by 39 * a struct page array 40 */ 41 #define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)) 42 43 /* 44 * PAGE_OFFSET - the virtual address of the start of the linear map (top 45 * (VA_BITS - 1)) 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. 49 */ 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) 66 67 #define KERNEL_START _text 68 #define KERNEL_END _end 69 70 #ifdef CONFIG_ARM64_USER_VA_BITS_52 71 #define MAX_USER_VA_BITS 52 72 #else 73 #define MAX_USER_VA_BITS VA_BITS 74 #endif 75 76 /* 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. 80 */ 81 #ifdef CONFIG_KASAN 82 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT)) 83 #ifdef CONFIG_KASAN_EXTRA 84 #define KASAN_THREAD_SHIFT 2 85 #else 86 #define KASAN_THREAD_SHIFT 1 87 #endif /* CONFIG_KASAN_EXTRA */ 88 #else 89 #define KASAN_SHADOW_SIZE (0) 90 #define KASAN_THREAD_SHIFT 0 91 #endif 92 93 #define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT) 94 95 /* 96 * VMAP'd stacks are allocated at page granularity, so we must ensure that such 97 * stacks are a multiple of page size. 98 */ 99 #if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT) 100 #define THREAD_SHIFT PAGE_SHIFT 101 #else 102 #define THREAD_SHIFT MIN_THREAD_SHIFT 103 #endif 104 105 #if THREAD_SHIFT >= PAGE_SHIFT 106 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 107 #endif 108 109 #define THREAD_SIZE (UL(1) << THREAD_SHIFT) 110 111 /* 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 114 * assembly. 115 */ 116 #ifdef CONFIG_VMAP_STACK 117 #define THREAD_ALIGN (2 * THREAD_SIZE) 118 #else 119 #define THREAD_ALIGN THREAD_SIZE 120 #endif 121 122 #define IRQ_STACK_SIZE THREAD_SIZE 123 124 #define OVERFLOW_STACK_SIZE SZ_4K 125 126 /* 127 * Alignment of kernel segments (e.g. .text, .data). 128 */ 129 #if defined(CONFIG_DEBUG_ALIGN_RODATA) 130 /* 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 134 */ 135 #define SEGMENT_ALIGN SZ_2M 136 #else 137 /* 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 141 */ 142 #define SEGMENT_ALIGN SZ_64K 143 #endif 144 145 /* 146 * Memory types available. 147 */ 148 #define MT_DEVICE_nGnRnE 0 149 #define MT_DEVICE_nGnRE 1 150 #define MT_DEVICE_GRE 2 151 #define MT_NORMAL_NC 3 152 #define MT_NORMAL 4 153 #define MT_NORMAL_WT 5 154 155 /* 156 * Memory types for Stage-2 translation 157 */ 158 #define MT_S2_NORMAL 0xf 159 #define MT_S2_DEVICE_nGnRE 0x1 160 161 /* 162 * Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001 163 * Stage-2 enforces Normal-WB and Device-nGnRE 164 */ 165 #define MT_S2_FWB_NORMAL 6 166 #define MT_S2_FWB_DEVICE_nGnRE 1 167 168 #ifdef CONFIG_ARM64_4K_PAGES 169 #define IOREMAP_MAX_ORDER (PUD_SHIFT) 170 #else 171 #define IOREMAP_MAX_ORDER (PMD_SHIFT) 172 #endif 173 174 #ifndef __ASSEMBLY__ 175 176 #include <linux/bitops.h> 177 #include <linux/mmdebug.h> 178 179 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; }) 182 183 /* the virtual base of the kernel image (minus TEXT_OFFSET) */ 184 extern u64 kimage_vaddr; 185 186 /* the offset between the kernel virtual and physical mappings */ 187 extern u64 kimage_voffset; 188 189 static inline unsigned long kaslr_offset(void) 190 { 191 return kimage_vaddr - KIMAGE_VADDR; 192 } 193 194 /* the actual size of a user virtual address */ 195 extern u64 vabits_user; 196 197 /* 198 * Allow all memory at the discovery stage. We will clip it later. 199 */ 200 #define MIN_MEMBLOCK_ADDR 0 201 #define MAX_MEMBLOCK_ADDR U64_MAX 202 203 /* 204 * PFNs are used to describe any physical page; this means 205 * PFN 0 == physical address 0. 206 * 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. 210 */ 211 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 212 213 /* 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. 217 */ 218 #define untagged_addr(addr) \ 219 ((__typeof__(addr))sign_extend64((u64)(addr), 55)) 220 221 #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) 227 #else 228 #define __tag_set(addr, tag) (addr) 229 #define __tag_reset(addr) (addr) 230 #define __tag_get(addr) 0 231 #endif 232 233 /* 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. 237 */ 238 239 240 /* 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 243 * sufficient check. 244 */ 245 #define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1))) 246 247 #define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET) 248 #define __kimg_to_phys(addr) ((addr) - kimage_voffset) 249 250 #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); \ 254 }) 255 256 #define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x)) 257 258 #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); 261 #else 262 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 263 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 264 #endif 265 266 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) 267 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) 268 269 /* 270 * Convert a page to/from a physical address 271 */ 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))) 274 275 /* 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. 279 */ 280 #define virt_to_phys virt_to_phys 281 static inline phys_addr_t virt_to_phys(const volatile void *x) 282 { 283 return __virt_to_phys((unsigned long)(x)); 284 } 285 286 #define phys_to_virt phys_to_virt 287 static inline void *phys_to_virt(phys_addr_t x) 288 { 289 return (void *)(__phys_to_virt(x)); 290 } 291 292 /* 293 * Drivers should NOT use these either. 294 */ 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)) 302 303 /* 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 306 */ 307 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 308 309 #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) 312 #else 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)) 315 316 #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)); \ 320 ((void *)__addr); \ 321 }) 322 323 #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START)) 324 325 #define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \ 326 + PHYS_OFFSET) >> PAGE_SHIFT) 327 #endif 328 #endif 329 330 #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)) 334 335 #include <asm-generic/memory_model.h> 336 337 #endif 338