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 MODULES_END (MODULES_VADDR + MODULES_VSIZE) 57 #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE) 58 #define MODULES_VSIZE (SZ_128M) 59 #define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE) 60 #define PCI_IO_END (VMEMMAP_START - SZ_2M) 61 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) 62 #define FIXADDR_TOP (PCI_IO_START - SZ_2M) 63 64 #define KERNEL_START _text 65 #define KERNEL_END _end 66 67 #ifdef CONFIG_ARM64_USER_VA_BITS_52 68 #define MAX_USER_VA_BITS 52 69 #else 70 #define MAX_USER_VA_BITS VA_BITS 71 #endif 72 73 /* 74 * KASAN requires 1/8th of the kernel virtual address space for the shadow 75 * region. KASAN can bloat the stack significantly, so double the (minimum) 76 * stack size when KASAN is in use, and then double it again if KASAN_EXTRA is 77 * on. 78 */ 79 #ifdef CONFIG_KASAN 80 #define KASAN_SHADOW_SCALE_SHIFT 3 81 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT)) 82 #ifdef CONFIG_KASAN_EXTRA 83 #define KASAN_THREAD_SHIFT 2 84 #else 85 #define KASAN_THREAD_SHIFT 1 86 #endif /* CONFIG_KASAN_EXTRA */ 87 #else 88 #define KASAN_SHADOW_SIZE (0) 89 #define KASAN_THREAD_SHIFT 0 90 #endif 91 92 #define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT) 93 94 /* 95 * VMAP'd stacks are allocated at page granularity, so we must ensure that such 96 * stacks are a multiple of page size. 97 */ 98 #if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT) 99 #define THREAD_SHIFT PAGE_SHIFT 100 #else 101 #define THREAD_SHIFT MIN_THREAD_SHIFT 102 #endif 103 104 #if THREAD_SHIFT >= PAGE_SHIFT 105 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 106 #endif 107 108 #define THREAD_SIZE (UL(1) << THREAD_SHIFT) 109 110 /* 111 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by 112 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry 113 * assembly. 114 */ 115 #ifdef CONFIG_VMAP_STACK 116 #define THREAD_ALIGN (2 * THREAD_SIZE) 117 #else 118 #define THREAD_ALIGN THREAD_SIZE 119 #endif 120 121 #define IRQ_STACK_SIZE THREAD_SIZE 122 123 #define OVERFLOW_STACK_SIZE SZ_4K 124 125 /* 126 * Alignment of kernel segments (e.g. .text, .data). 127 */ 128 #if defined(CONFIG_DEBUG_ALIGN_RODATA) 129 /* 130 * 4 KB granule: 1 level 2 entry 131 * 16 KB granule: 128 level 3 entries, with contiguous bit 132 * 64 KB granule: 32 level 3 entries, with contiguous bit 133 */ 134 #define SEGMENT_ALIGN SZ_2M 135 #else 136 /* 137 * 4 KB granule: 16 level 3 entries, with contiguous bit 138 * 16 KB granule: 4 level 3 entries, without contiguous bit 139 * 64 KB granule: 1 level 3 entry 140 */ 141 #define SEGMENT_ALIGN SZ_64K 142 #endif 143 144 /* 145 * Memory types available. 146 */ 147 #define MT_DEVICE_nGnRnE 0 148 #define MT_DEVICE_nGnRE 1 149 #define MT_DEVICE_GRE 2 150 #define MT_NORMAL_NC 3 151 #define MT_NORMAL 4 152 #define MT_NORMAL_WT 5 153 154 /* 155 * Memory types for Stage-2 translation 156 */ 157 #define MT_S2_NORMAL 0xf 158 #define MT_S2_DEVICE_nGnRE 0x1 159 160 /* 161 * Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001 162 * Stage-2 enforces Normal-WB and Device-nGnRE 163 */ 164 #define MT_S2_FWB_NORMAL 6 165 #define MT_S2_FWB_DEVICE_nGnRE 1 166 167 #ifdef CONFIG_ARM64_4K_PAGES 168 #define IOREMAP_MAX_ORDER (PUD_SHIFT) 169 #else 170 #define IOREMAP_MAX_ORDER (PMD_SHIFT) 171 #endif 172 173 #ifdef CONFIG_BLK_DEV_INITRD 174 #define __early_init_dt_declare_initrd(__start, __end) \ 175 do { \ 176 initrd_start = (__start); \ 177 initrd_end = (__end); \ 178 } while (0) 179 #endif 180 181 #ifndef __ASSEMBLY__ 182 183 #include <linux/bitops.h> 184 #include <linux/mmdebug.h> 185 186 extern s64 memstart_addr; 187 /* PHYS_OFFSET - the physical address of the start of memory. */ 188 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) 189 190 /* the virtual base of the kernel image (minus TEXT_OFFSET) */ 191 extern u64 kimage_vaddr; 192 193 /* the offset between the kernel virtual and physical mappings */ 194 extern u64 kimage_voffset; 195 196 static inline unsigned long kaslr_offset(void) 197 { 198 return kimage_vaddr - KIMAGE_VADDR; 199 } 200 201 /* the actual size of a user virtual address */ 202 extern u64 vabits_user; 203 204 /* 205 * Allow all memory at the discovery stage. We will clip it later. 206 */ 207 #define MIN_MEMBLOCK_ADDR 0 208 #define MAX_MEMBLOCK_ADDR U64_MAX 209 210 /* 211 * PFNs are used to describe any physical page; this means 212 * PFN 0 == physical address 0. 213 * 214 * This is the PFN of the first RAM page in the kernel 215 * direct-mapped view. We assume this is the first page 216 * of RAM in the mem_map as well. 217 */ 218 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 219 220 /* 221 * Physical vs virtual RAM address space conversion. These are 222 * private definitions which should NOT be used outside memory.h 223 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 224 */ 225 226 227 /* 228 * The linear kernel range starts in the middle of the virtual adddress 229 * space. Testing the top bit for the start of the region is a 230 * sufficient check. 231 */ 232 #define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1))) 233 234 #define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET) 235 #define __kimg_to_phys(addr) ((addr) - kimage_voffset) 236 237 #define __virt_to_phys_nodebug(x) ({ \ 238 phys_addr_t __x = (phys_addr_t)(x); \ 239 __is_lm_address(__x) ? __lm_to_phys(__x) : \ 240 __kimg_to_phys(__x); \ 241 }) 242 243 #define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x)) 244 245 #ifdef CONFIG_DEBUG_VIRTUAL 246 extern phys_addr_t __virt_to_phys(unsigned long x); 247 extern phys_addr_t __phys_addr_symbol(unsigned long x); 248 #else 249 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 250 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 251 #endif 252 253 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) 254 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) 255 256 /* 257 * Convert a page to/from a physical address 258 */ 259 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 260 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 261 262 /* 263 * Note: Drivers should NOT use these. They are the wrong 264 * translation for translating DMA addresses. Use the driver 265 * DMA support - see dma-mapping.h. 266 */ 267 #define virt_to_phys virt_to_phys 268 static inline phys_addr_t virt_to_phys(const volatile void *x) 269 { 270 return __virt_to_phys((unsigned long)(x)); 271 } 272 273 #define phys_to_virt phys_to_virt 274 static inline void *phys_to_virt(phys_addr_t x) 275 { 276 return (void *)(__phys_to_virt(x)); 277 } 278 279 /* 280 * Drivers should NOT use these either. 281 */ 282 #define __pa(x) __virt_to_phys((unsigned long)(x)) 283 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 284 #define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x)) 285 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 286 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 287 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x))) 288 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 289 290 /* 291 * virt_to_page(k) convert a _valid_ virtual address to struct page * 292 * virt_addr_valid(k) indicates whether a virtual address is valid 293 */ 294 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 295 296 #ifndef CONFIG_SPARSEMEM_VMEMMAP 297 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 298 #define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 299 #else 300 #define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page)) 301 #define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page)) 302 303 #define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET)) 304 #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START)) 305 306 #define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \ 307 + PHYS_OFFSET) >> PAGE_SHIFT) 308 #endif 309 #endif 310 311 #define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET) 312 #define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \ 313 _virt_addr_valid(kaddr)) 314 315 #include <asm-generic/memory_model.h> 316 317 #endif 318