1/* SPDX-License-Identifier: GPL-2.0-only */ 2/* 3 * Based on arch/arm/include/asm/memory.h 4 * 5 * Copyright (C) 2000-2002 Russell King 6 * Copyright (C) 2012 ARM Ltd. 7 * 8 * Note: this file should not be included by non-asm/.h files 9 */ 10#ifndef __ASM_MEMORY_H 11#define __ASM_MEMORY_H 12 13#include <linux/compiler.h> 14#include <linux/const.h> 15#include <linux/types.h> 16#include <asm/bug.h> 17#include <asm/page-def.h> 18#include <linux/sizes.h> 19 20/* 21 * Size of the PCI I/O space. This must remain a power of two so that 22 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses. 23 */ 24#define PCI_IO_SIZE SZ_16M 25 26/* 27 * VMEMMAP_SIZE - allows the whole linear region to be covered by 28 * a struct page array 29 */ 30#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)) 31 32/* 33 * PAGE_OFFSET - the virtual address of the start of the linear map (top 34 * (VA_BITS - 1)) 35 * KIMAGE_VADDR - the virtual address of the start of the kernel image 36 * VA_BITS - the maximum number of bits for virtual addresses. 37 * VA_START - the first kernel virtual address. 38 */ 39#define VA_BITS (CONFIG_ARM64_VA_BITS) 40#define VA_START (UL(0xffffffffffffffff) - \ 41 (UL(1) << VA_BITS) + 1) 42#define PAGE_OFFSET (UL(0xffffffffffffffff) - \ 43 (UL(1) << (VA_BITS - 1)) + 1) 44#define KIMAGE_VADDR (MODULES_END) 45#define BPF_JIT_REGION_START (VA_START + KASAN_SHADOW_SIZE) 46#define BPF_JIT_REGION_SIZE (SZ_128M) 47#define BPF_JIT_REGION_END (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE) 48#define MODULES_END (MODULES_VADDR + MODULES_VSIZE) 49#define MODULES_VADDR (BPF_JIT_REGION_END) 50#define MODULES_VSIZE (SZ_128M) 51#define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE) 52#define PCI_IO_END (VMEMMAP_START - SZ_2M) 53#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) 54#define FIXADDR_TOP (PCI_IO_START - SZ_2M) 55 56#define KERNEL_START _text 57#define KERNEL_END _end 58 59#ifdef CONFIG_ARM64_USER_VA_BITS_52 60#define MAX_USER_VA_BITS 52 61#else 62#define MAX_USER_VA_BITS VA_BITS 63#endif 64 65/* 66 * Generic and tag-based KASAN require 1/8th and 1/16th of the kernel virtual 67 * address space for the shadow region respectively. They can bloat the stack 68 * significantly, so double the (minimum) stack size when they are in use. 69 */ 70#ifdef CONFIG_KASAN 71#define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - KASAN_SHADOW_SCALE_SHIFT)) 72#define KASAN_THREAD_SHIFT 1 73#else 74#define KASAN_SHADOW_SIZE (0) 75#define KASAN_THREAD_SHIFT 0 76#endif 77 78#define MIN_THREAD_SHIFT (14 + KASAN_THREAD_SHIFT) 79 80/* 81 * VMAP'd stacks are allocated at page granularity, so we must ensure that such 82 * stacks are a multiple of page size. 83 */ 84#if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT) 85#define THREAD_SHIFT PAGE_SHIFT 86#else 87#define THREAD_SHIFT MIN_THREAD_SHIFT 88#endif 89 90#if THREAD_SHIFT >= PAGE_SHIFT 91#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT) 92#endif 93 94#define THREAD_SIZE (UL(1) << THREAD_SHIFT) 95 96/* 97 * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by 98 * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry 99 * assembly. 100 */ 101#ifdef CONFIG_VMAP_STACK 102#define THREAD_ALIGN (2 * THREAD_SIZE) 103#else 104#define THREAD_ALIGN THREAD_SIZE 105#endif 106 107#define IRQ_STACK_SIZE THREAD_SIZE 108 109#define OVERFLOW_STACK_SIZE SZ_4K 110 111/* 112 * Alignment of kernel segments (e.g. .text, .data). 113 */ 114#if defined(CONFIG_DEBUG_ALIGN_RODATA) 115/* 116 * 4 KB granule: 1 level 2 entry 117 * 16 KB granule: 128 level 3 entries, with contiguous bit 118 * 64 KB granule: 32 level 3 entries, with contiguous bit 119 */ 120#define SEGMENT_ALIGN SZ_2M 121#else 122/* 123 * 4 KB granule: 16 level 3 entries, with contiguous bit 124 * 16 KB granule: 4 level 3 entries, without contiguous bit 125 * 64 KB granule: 1 level 3 entry 126 */ 127#define SEGMENT_ALIGN SZ_64K 128#endif 129 130/* 131 * Memory types available. 132 */ 133#define MT_DEVICE_nGnRnE 0 134#define MT_DEVICE_nGnRE 1 135#define MT_DEVICE_GRE 2 136#define MT_NORMAL_NC 3 137#define MT_NORMAL 4 138#define MT_NORMAL_WT 5 139 140/* 141 * Memory types for Stage-2 translation 142 */ 143#define MT_S2_NORMAL 0xf 144#define MT_S2_DEVICE_nGnRE 0x1 145 146/* 147 * Memory types for Stage-2 translation when ID_AA64MMFR2_EL1.FWB is 0001 148 * Stage-2 enforces Normal-WB and Device-nGnRE 149 */ 150#define MT_S2_FWB_NORMAL 6 151#define MT_S2_FWB_DEVICE_nGnRE 1 152 153#ifdef CONFIG_ARM64_4K_PAGES 154#define IOREMAP_MAX_ORDER (PUD_SHIFT) 155#else 156#define IOREMAP_MAX_ORDER (PMD_SHIFT) 157#endif 158 159#ifndef __ASSEMBLY__ 160 161#include <linux/bitops.h> 162#include <linux/mmdebug.h> 163 164extern s64 memstart_addr; 165/* PHYS_OFFSET - the physical address of the start of memory. */ 166#define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) 167 168/* the virtual base of the kernel image (minus TEXT_OFFSET) */ 169extern u64 kimage_vaddr; 170 171/* the offset between the kernel virtual and physical mappings */ 172extern u64 kimage_voffset; 173 174static inline unsigned long kaslr_offset(void) 175{ 176 return kimage_vaddr - KIMAGE_VADDR; 177} 178 179/* the actual size of a user virtual address */ 180extern u64 vabits_user; 181 182/* 183 * Allow all memory at the discovery stage. We will clip it later. 184 */ 185#define MIN_MEMBLOCK_ADDR 0 186#define MAX_MEMBLOCK_ADDR U64_MAX 187 188/* 189 * PFNs are used to describe any physical page; this means 190 * PFN 0 == physical address 0. 191 * 192 * This is the PFN of the first RAM page in the kernel 193 * direct-mapped view. We assume this is the first page 194 * of RAM in the mem_map as well. 195 */ 196#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 197 198/* 199 * When dealing with data aborts, watchpoints, or instruction traps we may end 200 * up with a tagged userland pointer. Clear the tag to get a sane pointer to 201 * pass on to access_ok(), for instance. 202 */ 203#define untagged_addr(addr) \ 204 ((__typeof__(addr))sign_extend64((u64)(addr), 55)) 205 206#ifdef CONFIG_KASAN_SW_TAGS 207#define __tag_shifted(tag) ((u64)(tag) << 56) 208#define __tag_set(addr, tag) (__typeof__(addr))( \ 209 ((u64)(addr) & ~__tag_shifted(0xff)) | __tag_shifted(tag)) 210#define __tag_reset(addr) untagged_addr(addr) 211#define __tag_get(addr) (__u8)((u64)(addr) >> 56) 212#else 213static inline const void *__tag_set(const void *addr, u8 tag) 214{ 215 return addr; 216} 217 218#define __tag_reset(addr) (addr) 219#define __tag_get(addr) 0 220#endif 221 222/* 223 * Physical vs virtual RAM address space conversion. These are 224 * private definitions which should NOT be used outside memory.h 225 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 226 */ 227 228 229/* 230 * The linear kernel range starts in the middle of the virtual adddress 231 * space. Testing the top bit for the start of the region is a 232 * sufficient check. 233 */ 234#define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1))) 235 236#define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET) 237#define __kimg_to_phys(addr) ((addr) - kimage_voffset) 238 239#define __virt_to_phys_nodebug(x) ({ \ 240 phys_addr_t __x = (phys_addr_t)(x); \ 241 __is_lm_address(__x) ? __lm_to_phys(__x) : \ 242 __kimg_to_phys(__x); \ 243}) 244 245#define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x)) 246 247#ifdef CONFIG_DEBUG_VIRTUAL 248extern phys_addr_t __virt_to_phys(unsigned long x); 249extern phys_addr_t __phys_addr_symbol(unsigned long x); 250#else 251#define __virt_to_phys(x) __virt_to_phys_nodebug(x) 252#define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 253#endif 254 255#define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) 256#define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) 257 258/* 259 * Convert a page to/from a physical address 260 */ 261#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 262#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 263 264/* 265 * Note: Drivers should NOT use these. They are the wrong 266 * translation for translating DMA addresses. Use the driver 267 * DMA support - see dma-mapping.h. 268 */ 269#define virt_to_phys virt_to_phys 270static inline phys_addr_t virt_to_phys(const volatile void *x) 271{ 272 return __virt_to_phys((unsigned long)(x)); 273} 274 275#define phys_to_virt phys_to_virt 276static inline void *phys_to_virt(phys_addr_t x) 277{ 278 return (void *)(__phys_to_virt(x)); 279} 280 281/* 282 * Drivers should NOT use these either. 283 */ 284#define __pa(x) __virt_to_phys((unsigned long)(x)) 285#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 286#define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x)) 287#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 288#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 289#define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x))) 290#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 291 292/* 293 * virt_to_page(k) convert a _valid_ virtual address to struct page * 294 * virt_addr_valid(k) indicates whether a virtual address is valid 295 */ 296#define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 297 298#if !defined(CONFIG_SPARSEMEM_VMEMMAP) || defined(CONFIG_DEBUG_VIRTUAL) 299#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 300#define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 301#else 302#define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page)) 303#define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page)) 304 305#define page_to_virt(page) ({ \ 306 unsigned long __addr = \ 307 ((__page_to_voff(page)) | PAGE_OFFSET); \ 308 const void *__addr_tag = \ 309 __tag_set((void *)__addr, page_kasan_tag(page)); \ 310 ((void *)__addr_tag); \ 311}) 312 313#define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START)) 314 315#define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \ 316 + PHYS_OFFSET) >> PAGE_SHIFT) 317#endif 318#endif 319 320#define _virt_addr_is_linear(kaddr) \ 321 (__tag_reset((u64)(kaddr)) >= PAGE_OFFSET) 322#define virt_addr_valid(kaddr) \ 323 (_virt_addr_is_linear(kaddr) && _virt_addr_valid(kaddr)) 324 325/* 326 * Given that the GIC architecture permits ITS implementations that can only be 327 * configured with a LPI table address once, GICv3 systems with many CPUs may 328 * end up reserving a lot of different regions after a kexec for their LPI 329 * tables (one per CPU), as we are forced to reuse the same memory after kexec 330 * (and thus reserve it persistently with EFI beforehand) 331 */ 332#if defined(CONFIG_EFI) && defined(CONFIG_ARM_GIC_V3_ITS) 333# define INIT_MEMBLOCK_RESERVED_REGIONS (INIT_MEMBLOCK_REGIONS + NR_CPUS + 1) 334#endif 335 336#include <asm-generic/memory_model.h> 337 338#endif 339