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 * Allow for constants defined here to be used from assembly code 33 * by prepending the UL suffix only with actual C code compilation. 34 */ 35 #define UL(x) _AC(x, UL) 36 37 /* 38 * Size of the PCI I/O space. This must remain a power of two so that 39 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses. 40 */ 41 #define PCI_IO_SIZE SZ_16M 42 43 /* 44 * Log2 of the upper bound of the size of a struct page. Used for sizing 45 * the vmemmap region only, does not affect actual memory footprint. 46 * We don't use sizeof(struct page) directly since taking its size here 47 * requires its definition to be available at this point in the inclusion 48 * chain, and it may not be a power of 2 in the first place. 49 */ 50 #define STRUCT_PAGE_MAX_SHIFT 6 51 52 /* 53 * VMEMMAP_SIZE - allows the whole linear region to be covered by 54 * a struct page array 55 */ 56 #define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)) 57 58 /* 59 * PAGE_OFFSET - the virtual address of the start of the linear map (top 60 * (VA_BITS - 1)) 61 * KIMAGE_VADDR - the virtual address of the start of the kernel image 62 * VA_BITS - the maximum number of bits for virtual addresses. 63 * VA_START - the first kernel virtual address. 64 */ 65 #define VA_BITS (CONFIG_ARM64_VA_BITS) 66 #define VA_START (UL(0xffffffffffffffff) - \ 67 (UL(1) << VA_BITS) + 1) 68 #define PAGE_OFFSET (UL(0xffffffffffffffff) - \ 69 (UL(1) << (VA_BITS - 1)) + 1) 70 #define KIMAGE_VADDR (MODULES_END) 71 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE) 72 #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE) 73 #define MODULES_VSIZE (SZ_128M) 74 #define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE) 75 #define PCI_IO_END (VMEMMAP_START - SZ_2M) 76 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) 77 #define FIXADDR_TOP (PCI_IO_START - SZ_2M) 78 79 #define KERNEL_START _text 80 #define KERNEL_END _end 81 82 /* 83 * KASAN requires 1/8th of the kernel virtual address space for the shadow 84 * region. KASAN can bloat the stack significantly, so double the (minimum) 85 * stack size when KASAN is in use. 86 */ 87 #ifdef CONFIG_KASAN 88 #define KASAN_SHADOW_SCALE_SHIFT 3 89 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT)) 90 #define KASAN_THREAD_SHIFT 1 91 #else 92 #define KASAN_SHADOW_SIZE (0) 93 #define KASAN_THREAD_SHIFT 0 94 #endif 95 96 #define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT) 97 98 /* 99 * VMAP'd stacks are allocated at page granularity, so we must ensure that such 100 * stacks are a multiple of page size. 101 */ 102 #if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT) 103 #define THREAD_SHIFT PAGE_SHIFT 104 #else 105 #define THREAD_SHIFT MIN_THREAD_SHIFT 106 #endif 107 108 #if THREAD_SHIFT >= PAGE_SHIFT 109 #define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 110 #endif 111 112 #define THREAD_SIZE (UL(1) << THREAD_SHIFT) 113 114 /* 115 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by 116 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry 117 * assembly. 118 */ 119 #ifdef CONFIG_VMAP_STACK 120 #define THREAD_ALIGN (2 * THREAD_SIZE) 121 #else 122 #define THREAD_ALIGN THREAD_SIZE 123 #endif 124 125 #define IRQ_STACK_SIZE THREAD_SIZE 126 127 #define OVERFLOW_STACK_SIZE SZ_4K 128 129 /* 130 * Alignment of kernel segments (e.g. .text, .data). 131 */ 132 #if defined(CONFIG_DEBUG_ALIGN_RODATA) 133 /* 134 * 4 KB granule: 1 level 2 entry 135 * 16 KB granule: 128 level 3 entries, with contiguous bit 136 * 64 KB granule: 32 level 3 entries, with contiguous bit 137 */ 138 #define SEGMENT_ALIGN SZ_2M 139 #else 140 /* 141 * 4 KB granule: 16 level 3 entries, with contiguous bit 142 * 16 KB granule: 4 level 3 entries, without contiguous bit 143 * 64 KB granule: 1 level 3 entry 144 */ 145 #define SEGMENT_ALIGN SZ_64K 146 #endif 147 148 /* 149 * Memory types available. 150 */ 151 #define MT_DEVICE_nGnRnE 0 152 #define MT_DEVICE_nGnRE 1 153 #define MT_DEVICE_GRE 2 154 #define MT_NORMAL_NC 3 155 #define MT_NORMAL 4 156 #define MT_NORMAL_WT 5 157 158 /* 159 * Memory types for Stage-2 translation 160 */ 161 #define MT_S2_NORMAL 0xf 162 #define MT_S2_DEVICE_nGnRE 0x1 163 164 #ifdef CONFIG_ARM64_4K_PAGES 165 #define IOREMAP_MAX_ORDER (PUD_SHIFT) 166 #else 167 #define IOREMAP_MAX_ORDER (PMD_SHIFT) 168 #endif 169 170 #ifdef CONFIG_BLK_DEV_INITRD 171 #define __early_init_dt_declare_initrd(__start, __end) \ 172 do { \ 173 initrd_start = (__start); \ 174 initrd_end = (__end); \ 175 } while (0) 176 #endif 177 178 #ifndef __ASSEMBLY__ 179 180 #include <linux/bitops.h> 181 #include <linux/mmdebug.h> 182 183 extern s64 memstart_addr; 184 /* PHYS_OFFSET - the physical address of the start of memory. */ 185 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) 186 187 /* the virtual base of the kernel image (minus TEXT_OFFSET) */ 188 extern u64 kimage_vaddr; 189 190 /* the offset between the kernel virtual and physical mappings */ 191 extern u64 kimage_voffset; 192 193 static inline unsigned long kaslr_offset(void) 194 { 195 return kimage_vaddr - KIMAGE_VADDR; 196 } 197 198 /* 199 * Allow all memory at the discovery stage. We will clip it later. 200 */ 201 #define MIN_MEMBLOCK_ADDR 0 202 #define MAX_MEMBLOCK_ADDR U64_MAX 203 204 /* 205 * PFNs are used to describe any physical page; this means 206 * PFN 0 == physical address 0. 207 * 208 * This is the PFN of the first RAM page in the kernel 209 * direct-mapped view. We assume this is the first page 210 * of RAM in the mem_map as well. 211 */ 212 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 213 214 /* 215 * Physical vs virtual RAM address space conversion. These are 216 * private definitions which should NOT be used outside memory.h 217 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 218 */ 219 220 221 /* 222 * The linear kernel range starts in the middle of the virtual adddress 223 * space. Testing the top bit for the start of the region is a 224 * sufficient check. 225 */ 226 #define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1))) 227 228 #define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET) 229 #define __kimg_to_phys(addr) ((addr) - kimage_voffset) 230 231 #define __virt_to_phys_nodebug(x) ({ \ 232 phys_addr_t __x = (phys_addr_t)(x); \ 233 __is_lm_address(__x) ? __lm_to_phys(__x) : \ 234 __kimg_to_phys(__x); \ 235 }) 236 237 #define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x)) 238 239 #ifdef CONFIG_DEBUG_VIRTUAL 240 extern phys_addr_t __virt_to_phys(unsigned long x); 241 extern phys_addr_t __phys_addr_symbol(unsigned long x); 242 #else 243 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 244 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 245 #endif 246 247 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) 248 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) 249 250 /* 251 * Convert a page to/from a physical address 252 */ 253 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 254 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 255 256 /* 257 * Note: Drivers should NOT use these. They are the wrong 258 * translation for translating DMA addresses. Use the driver 259 * DMA support - see dma-mapping.h. 260 */ 261 #define virt_to_phys virt_to_phys 262 static inline phys_addr_t virt_to_phys(const volatile void *x) 263 { 264 return __virt_to_phys((unsigned long)(x)); 265 } 266 267 #define phys_to_virt phys_to_virt 268 static inline void *phys_to_virt(phys_addr_t x) 269 { 270 return (void *)(__phys_to_virt(x)); 271 } 272 273 /* 274 * Drivers should NOT use these either. 275 */ 276 #define __pa(x) __virt_to_phys((unsigned long)(x)) 277 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 278 #define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x)) 279 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 280 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 281 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x))) 282 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 283 284 /* 285 * virt_to_page(k) convert a _valid_ virtual address to struct page * 286 * virt_addr_valid(k) indicates whether a virtual address is valid 287 */ 288 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 289 290 #ifndef CONFIG_SPARSEMEM_VMEMMAP 291 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 292 #define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 293 #else 294 #define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page)) 295 #define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page)) 296 297 #define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET)) 298 #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START)) 299 300 #define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \ 301 + PHYS_OFFSET) >> PAGE_SHIFT) 302 #endif 303 #endif 304 305 #define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET) 306 #define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \ 307 _virt_addr_valid(kaddr)) 308 309 #include <asm-generic/memory_model.h> 310 311 #endif 312