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