arch/arm64/include/asm/memory.h

   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
 164 extern 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) */
 169 extern u64                      kimage_vaddr;
 170
 171 /* the offset between the kernel virtual and physical mappings */
 172 extern u64                      kimage_voffset;
 173
 174 static inline unsigned long kaslr_offset(void)
 175 {
 176         return kimage_vaddr - KIMAGE_VADDR;
 177 }
 178
 179 /* the actual size of a user virtual address */
 180 extern 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
 213 static 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
 248 extern phys_addr_t __virt_to_phys(unsigned long x);
 249 extern 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
 270 static 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
 276 static 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