1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Based on arch/arm/include/asm/memory.h 4 * 5 * Copyright (C) 2000-2002 Russell King 6 * Copyright (C) 2012 ARM Ltd. 7 * 8 * Note: this file should not be included by non-asm/.h files 9 */ 10 #ifndef __ASM_MEMORY_H 11 #define __ASM_MEMORY_H 12 13 #include <linux/compiler.h> 14 #include <linux/const.h> 15 #include <linux/sizes.h> 16 #include <linux/types.h> 17 #include <asm/bug.h> 18 #include <asm/page-def.h> 19 20 /* 21 * Size of the PCI I/O space. This must remain a power of two so that 22 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses. 23 */ 24 #define PCI_IO_SIZE SZ_16M 25 26 /* 27 * VMEMMAP_SIZE - allows the whole linear region to be covered by 28 * a struct page array 29 * 30 * If we are configured with a 52-bit kernel VA then our VMEMMAP_SIZE 31 * needs to cover the memory region from the beginning of the 52-bit 32 * PAGE_OFFSET all the way to PAGE_END for 48-bit. This allows us to 33 * keep a constant PAGE_OFFSET and "fallback" to using the higher end 34 * of the VMEMMAP where 52-bit support is not available in hardware. 35 */ 36 #define VMEMMAP_SIZE ((_PAGE_END(VA_BITS_MIN) - PAGE_OFFSET) \ 37 >> (PAGE_SHIFT - STRUCT_PAGE_MAX_SHIFT)) 38 39 /* 40 * PAGE_OFFSET - the virtual address of the start of the linear map, at the 41 * start of the TTBR1 address space. 42 * PAGE_END - the end of the linear map, where all other kernel mappings begin. 43 * KIMAGE_VADDR - the virtual address of the start of the kernel image. 44 * VA_BITS - the maximum number of bits for virtual addresses. 45 */ 46 #define VA_BITS (CONFIG_ARM64_VA_BITS) 47 #define _PAGE_OFFSET(va) (-(UL(1) << (va))) 48 #define PAGE_OFFSET (_PAGE_OFFSET(VA_BITS)) 49 #define KIMAGE_VADDR (MODULES_END) 50 #define BPF_JIT_REGION_START (KASAN_SHADOW_END) 51 #define BPF_JIT_REGION_SIZE (SZ_128M) 52 #define BPF_JIT_REGION_END (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE) 53 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE) 54 #define MODULES_VADDR (BPF_JIT_REGION_END) 55 #define MODULES_VSIZE (SZ_128M) 56 #define VMEMMAP_START (-VMEMMAP_SIZE - SZ_2M) 57 #define PCI_IO_END (VMEMMAP_START - SZ_2M) 58 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) 59 #define FIXADDR_TOP (PCI_IO_START - SZ_2M) 60 61 #if VA_BITS > 48 62 #define VA_BITS_MIN (48) 63 #else 64 #define VA_BITS_MIN (VA_BITS) 65 #endif 66 67 #define _PAGE_END(va) (-(UL(1) << ((va) - 1))) 68 69 #define KERNEL_START _text 70 #define KERNEL_END _end 71 72 #ifdef CONFIG_ARM64_VA_BITS_52 73 #define MAX_USER_VA_BITS 52 74 #else 75 #define MAX_USER_VA_BITS VA_BITS 76 #endif 77 78 /* 79 * Generic and tag-based KASAN require 1/8th and 1/16th of the kernel virtual 80 * address space for the shadow region respectively. They can bloat the stack 81 * significantly, so double the (minimum) stack size when they are in use. 82 */ 83 #ifdef CONFIG_KASAN 84 #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL) 85 #define KASAN_SHADOW_END ((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \ 86 + KASAN_SHADOW_OFFSET) 87 #define KASAN_THREAD_SHIFT 1 88 #else 89 #define KASAN_THREAD_SHIFT 0 90 #define KASAN_SHADOW_END (_PAGE_END(VA_BITS_MIN)) 91 #endif /* CONFIG_KASAN */ 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 extern u64 vabits_actual; 176 #define PAGE_END (_PAGE_END(vabits_actual)) 177 178 #include <linux/bitops.h> 179 #include <linux/mmdebug.h> 180 181 extern s64 physvirt_offset; 182 extern s64 memstart_addr; 183 /* PHYS_OFFSET - the physical address of the start of memory. */ 184 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) 185 186 /* the virtual base of the kernel image (minus TEXT_OFFSET) */ 187 extern u64 kimage_vaddr; 188 189 /* the offset between the kernel virtual and physical mappings */ 190 extern u64 kimage_voffset; 191 192 static inline unsigned long kaslr_offset(void) 193 { 194 return kimage_vaddr - KIMAGE_VADDR; 195 } 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 ((__force __typeof__(addr))sign_extend64((__force u64)(addr), 55)) 220 221 #define untagged_addr(addr) ({ \ 222 u64 __addr = (__force u64)addr; \ 223 __addr &= __untagged_addr(__addr); \ 224 (__force __typeof__(addr))__addr; \ 225 }) 226 227 #ifdef CONFIG_KASAN_SW_TAGS 228 #define __tag_shifted(tag) ((u64)(tag) << 56) 229 #define __tag_reset(addr) __untagged_addr(addr) 230 #define __tag_get(addr) (__u8)((u64)(addr) >> 56) 231 #else 232 #define __tag_shifted(tag) 0UL 233 #define __tag_reset(addr) (addr) 234 #define __tag_get(addr) 0 235 #endif /* CONFIG_KASAN_SW_TAGS */ 236 237 static inline const void *__tag_set(const void *addr, u8 tag) 238 { 239 u64 __addr = (u64)addr & ~__tag_shifted(0xff); 240 return (const void *)(__addr | __tag_shifted(tag)); 241 } 242 243 /* 244 * Physical vs virtual RAM address space conversion. These are 245 * private definitions which should NOT be used outside memory.h 246 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 247 */ 248 249 250 /* 251 * The linear kernel range starts at the bottom of the virtual address 252 * space. Testing the top bit for the start of the region is a 253 * sufficient check and avoids having to worry about the tag. 254 */ 255 #define __is_lm_address(addr) (!(((u64)addr) & BIT(vabits_actual - 1))) 256 257 #define __lm_to_phys(addr) (((addr) + physvirt_offset)) 258 #define __kimg_to_phys(addr) ((addr) - kimage_voffset) 259 260 #define __virt_to_phys_nodebug(x) ({ \ 261 phys_addr_t __x = (phys_addr_t)(__tag_reset(x)); \ 262 __is_lm_address(__x) ? __lm_to_phys(__x) : __kimg_to_phys(__x); \ 263 }) 264 265 #define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x)) 266 267 #ifdef CONFIG_DEBUG_VIRTUAL 268 extern phys_addr_t __virt_to_phys(unsigned long x); 269 extern phys_addr_t __phys_addr_symbol(unsigned long x); 270 #else 271 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 272 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 273 #endif /* CONFIG_DEBUG_VIRTUAL */ 274 275 #define __phys_to_virt(x) ((unsigned long)((x) - physvirt_offset)) 276 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) 277 278 /* 279 * Convert a page to/from a physical address 280 */ 281 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 282 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 283 284 /* 285 * Note: Drivers should NOT use these. They are the wrong 286 * translation for translating DMA addresses. Use the driver 287 * DMA support - see dma-mapping.h. 288 */ 289 #define virt_to_phys virt_to_phys 290 static inline phys_addr_t virt_to_phys(const volatile void *x) 291 { 292 return __virt_to_phys((unsigned long)(x)); 293 } 294 295 #define phys_to_virt phys_to_virt 296 static inline void *phys_to_virt(phys_addr_t x) 297 { 298 return (void *)(__phys_to_virt(x)); 299 } 300 301 /* 302 * Drivers should NOT use these either. 303 */ 304 #define __pa(x) __virt_to_phys((unsigned long)(x)) 305 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 306 #define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x)) 307 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 308 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 309 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x))) 310 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 311 312 /* 313 * virt_to_page(x) convert a _valid_ virtual address to struct page * 314 * virt_addr_valid(x) indicates whether a virtual address is valid 315 */ 316 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 317 318 #if !defined(CONFIG_SPARSEMEM_VMEMMAP) || defined(CONFIG_DEBUG_VIRTUAL) 319 #define virt_to_page(x) pfn_to_page(virt_to_pfn(x)) 320 #else 321 #define page_to_virt(x) ({ \ 322 __typeof__(x) __page = x; \ 323 u64 __idx = ((u64)__page - VMEMMAP_START) / sizeof(struct page);\ 324 u64 __addr = PAGE_OFFSET + (__idx * PAGE_SIZE); \ 325 (void *)__tag_set((const void *)__addr, page_kasan_tag(__page));\ 326 }) 327 328 #define virt_to_page(x) ({ \ 329 u64 __idx = (__tag_reset((u64)x) - PAGE_OFFSET) / PAGE_SIZE; \ 330 u64 __addr = VMEMMAP_START + (__idx * sizeof(struct page)); \ 331 (struct page *)__addr; \ 332 }) 333 #endif /* !CONFIG_SPARSEMEM_VMEMMAP || CONFIG_DEBUG_VIRTUAL */ 334 335 #define virt_addr_valid(addr) ({ \ 336 __typeof__(addr) __addr = addr; \ 337 __is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr)); \ 338 }) 339 340 #endif /* !ASSEMBLY */ 341 342 /* 343 * Given that the GIC architecture permits ITS implementations that can only be 344 * configured with a LPI table address once, GICv3 systems with many CPUs may 345 * end up reserving a lot of different regions after a kexec for their LPI 346 * tables (one per CPU), as we are forced to reuse the same memory after kexec 347 * (and thus reserve it persistently with EFI beforehand) 348 */ 349 #if defined(CONFIG_EFI) && defined(CONFIG_ARM_GIC_V3_ITS) 350 # define INIT_MEMBLOCK_RESERVED_REGIONS (INIT_MEMBLOCK_REGIONS + NR_CPUS + 1) 351 #endif 352 353 #include <asm-generic/memory_model.h> 354 355 #endif /* __ASM_MEMORY_H */ 356