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/sizes.h> 29 30 /* 31 * Allow for constants defined here to be used from assembly code 32 * by prepending the UL suffix only with actual C code compilation. 33 */ 34 #define UL(x) _AC(x, UL) 35 36 /* 37 * Size of the PCI I/O space. This must remain a power of two so that 38 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses. 39 */ 40 #define PCI_IO_SIZE SZ_16M 41 42 /* 43 * Log2 of the upper bound of the size of a struct page. Used for sizing 44 * the vmemmap region only, does not affect actual memory footprint. 45 * We don't use sizeof(struct page) directly since taking its size here 46 * requires its definition to be available at this point in the inclusion 47 * chain, and it may not be a power of 2 in the first place. 48 */ 49 #define STRUCT_PAGE_MAX_SHIFT 6 50 51 /* 52 * VMEMMAP_SIZE - allows the whole linear region to be covered by 53 * a struct page array 54 */ 55 #define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)) 56 57 /* 58 * PAGE_OFFSET - the virtual address of the start of the linear map (top 59 * (VA_BITS - 1)) 60 * KIMAGE_VADDR - the virtual address of the start of the kernel image 61 * VA_BITS - the maximum number of bits for virtual addresses. 62 * VA_START - the first kernel virtual address. 63 * TASK_SIZE - the maximum size of a user space task. 64 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. 65 */ 66 #define VA_BITS (CONFIG_ARM64_VA_BITS) 67 #define VA_START (UL(0xffffffffffffffff) - \ 68 (UL(1) << VA_BITS) + 1) 69 #define PAGE_OFFSET (UL(0xffffffffffffffff) - \ 70 (UL(1) << (VA_BITS - 1)) + 1) 71 #define KIMAGE_VADDR (MODULES_END) 72 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE) 73 #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE) 74 #define MODULES_VSIZE (SZ_128M) 75 #define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE) 76 #define PCI_IO_END (VMEMMAP_START - SZ_2M) 77 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) 78 #define FIXADDR_TOP (PCI_IO_START - SZ_2M) 79 #define TASK_SIZE_64 (UL(1) << VA_BITS) 80 81 #ifdef CONFIG_COMPAT 82 #define TASK_SIZE_32 UL(0x100000000) 83 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ 84 TASK_SIZE_32 : TASK_SIZE_64) 85 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ 86 TASK_SIZE_32 : TASK_SIZE_64) 87 #else 88 #define TASK_SIZE TASK_SIZE_64 89 #endif /* CONFIG_COMPAT */ 90 91 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) 92 93 #define KERNEL_START _text 94 #define KERNEL_END _end 95 96 /* 97 * The size of the KASAN shadow region. This should be 1/8th of the 98 * size of the entire kernel virtual address space. 99 */ 100 #ifdef CONFIG_KASAN 101 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3)) 102 #else 103 #define KASAN_SHADOW_SIZE (0) 104 #endif 105 106 /* 107 * Memory types available. 108 */ 109 #define MT_DEVICE_nGnRnE 0 110 #define MT_DEVICE_nGnRE 1 111 #define MT_DEVICE_GRE 2 112 #define MT_NORMAL_NC 3 113 #define MT_NORMAL 4 114 #define MT_NORMAL_WT 5 115 116 /* 117 * Memory types for Stage-2 translation 118 */ 119 #define MT_S2_NORMAL 0xf 120 #define MT_S2_DEVICE_nGnRE 0x1 121 122 #ifdef CONFIG_ARM64_4K_PAGES 123 #define IOREMAP_MAX_ORDER (PUD_SHIFT) 124 #else 125 #define IOREMAP_MAX_ORDER (PMD_SHIFT) 126 #endif 127 128 #ifdef CONFIG_BLK_DEV_INITRD 129 #define __early_init_dt_declare_initrd(__start, __end) \ 130 do { \ 131 initrd_start = (__start); \ 132 initrd_end = (__end); \ 133 } while (0) 134 #endif 135 136 #ifndef __ASSEMBLY__ 137 138 #include <linux/bitops.h> 139 #include <linux/mmdebug.h> 140 141 extern s64 memstart_addr; 142 /* PHYS_OFFSET - the physical address of the start of memory. */ 143 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) 144 145 /* the virtual base of the kernel image (minus TEXT_OFFSET) */ 146 extern u64 kimage_vaddr; 147 148 /* the offset between the kernel virtual and physical mappings */ 149 extern u64 kimage_voffset; 150 151 static inline unsigned long kaslr_offset(void) 152 { 153 return kimage_vaddr - KIMAGE_VADDR; 154 } 155 156 /* 157 * Allow all memory at the discovery stage. We will clip it later. 158 */ 159 #define MIN_MEMBLOCK_ADDR 0 160 #define MAX_MEMBLOCK_ADDR U64_MAX 161 162 /* 163 * PFNs are used to describe any physical page; this means 164 * PFN 0 == physical address 0. 165 * 166 * This is the PFN of the first RAM page in the kernel 167 * direct-mapped view. We assume this is the first page 168 * of RAM in the mem_map as well. 169 */ 170 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 171 172 /* 173 * Physical vs virtual RAM address space conversion. These are 174 * private definitions which should NOT be used outside memory.h 175 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 176 */ 177 178 179 /* 180 * The linear kernel range starts in the middle of the virtual adddress 181 * space. Testing the top bit for the start of the region is a 182 * sufficient check. 183 */ 184 #define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1))) 185 186 #define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET) 187 #define __kimg_to_phys(addr) ((addr) - kimage_voffset) 188 189 #define __virt_to_phys_nodebug(x) ({ \ 190 phys_addr_t __x = (phys_addr_t)(x); \ 191 __is_lm_address(__x) ? __lm_to_phys(__x) : \ 192 __kimg_to_phys(__x); \ 193 }) 194 195 #define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x)) 196 197 #ifdef CONFIG_DEBUG_VIRTUAL 198 extern phys_addr_t __virt_to_phys(unsigned long x); 199 extern phys_addr_t __phys_addr_symbol(unsigned long x); 200 #else 201 #define __virt_to_phys(x) __virt_to_phys_nodebug(x) 202 #define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 203 #endif 204 205 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) 206 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) 207 208 /* 209 * Convert a page to/from a physical address 210 */ 211 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 212 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 213 214 /* 215 * Note: Drivers should NOT use these. They are the wrong 216 * translation for translating DMA addresses. Use the driver 217 * DMA support - see dma-mapping.h. 218 */ 219 #define virt_to_phys virt_to_phys 220 static inline phys_addr_t virt_to_phys(const volatile void *x) 221 { 222 return __virt_to_phys((unsigned long)(x)); 223 } 224 225 #define phys_to_virt phys_to_virt 226 static inline void *phys_to_virt(phys_addr_t x) 227 { 228 return (void *)(__phys_to_virt(x)); 229 } 230 231 /* 232 * Drivers should NOT use these either. 233 */ 234 #define __pa(x) __virt_to_phys((unsigned long)(x)) 235 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 236 #define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x)) 237 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 238 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 239 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x))) 240 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 241 242 /* 243 * virt_to_page(k) convert a _valid_ virtual address to struct page * 244 * virt_addr_valid(k) indicates whether a virtual address is valid 245 */ 246 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 247 248 #ifndef CONFIG_SPARSEMEM_VMEMMAP 249 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 250 #define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 251 #else 252 #define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page)) 253 #define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page)) 254 255 #define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET)) 256 #define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START)) 257 258 #define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \ 259 + PHYS_OFFSET) >> PAGE_SHIFT) 260 #endif 261 #endif 262 263 #define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET) 264 #define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \ 265 _virt_addr_valid(kaddr)) 266 267 #include <asm-generic/memory_model.h> 268 269 #endif 270