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