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/const.h>
  14 #include <linux/sizes.h>
  15 #include <asm/page-def.h>
  16
  17 /*
  18  * Size of the PCI I/O space. This must remain a power of two so that
  19  * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
  20  */
  21 #define PCI_IO_SIZE             SZ_16M
  22
  23 /*
  24  * VMEMMAP_SIZE - allows the whole linear region to be covered by
  25  *                a struct page array
  26  *
  27  * If we are configured with a 52-bit kernel VA then our VMEMMAP_SIZE
  28  * needs to cover the memory region from the beginning of the 52-bit
  29  * PAGE_OFFSET all the way to PAGE_END for 48-bit. This allows us to
  30  * keep a constant PAGE_OFFSET and "fallback" to using the higher end
  31  * of the VMEMMAP where 52-bit support is not available in hardware.
  32  */
  33 #define VMEMMAP_SHIFT   (PAGE_SHIFT - STRUCT_PAGE_MAX_SHIFT)
  34 #define VMEMMAP_SIZE    ((_PAGE_END(VA_BITS_MIN) - PAGE_OFFSET) >> VMEMMAP_SHIFT)
  35
  36 /*
  37  * PAGE_OFFSET - the virtual address of the start of the linear map, at the
  38  *               start of the TTBR1 address space.
  39  * PAGE_END - the end of the linear map, where all other kernel mappings begin.
  40  * KIMAGE_VADDR - the virtual address of the start of the kernel image.
  41  * VA_BITS - the maximum number of bits for virtual addresses.
  42  */
  43 #define VA_BITS                 (CONFIG_ARM64_VA_BITS)
  44 #define _PAGE_OFFSET(va)        (-(UL(1) << (va)))
  45 #define PAGE_OFFSET             (_PAGE_OFFSET(VA_BITS))
  46 #define KIMAGE_VADDR            (MODULES_END)
  47 #define BPF_JIT_REGION_START    (_PAGE_END(VA_BITS_MIN))
  48 #define BPF_JIT_REGION_SIZE     (SZ_128M)
  49 #define BPF_JIT_REGION_END      (BPF_JIT_REGION_START + BPF_JIT_REGION_SIZE)
  50 #define MODULES_END             (MODULES_VADDR + MODULES_VSIZE)
  51 #define MODULES_VADDR           (BPF_JIT_REGION_END)
  52 #define MODULES_VSIZE           (SZ_128M)
  53 #define VMEMMAP_START           (-(UL(1) << (VA_BITS - VMEMMAP_SHIFT)))
  54 #define VMEMMAP_END             (VMEMMAP_START + VMEMMAP_SIZE)
  55 #define PCI_IO_END              (VMEMMAP_START - SZ_8M)
  56 #define PCI_IO_START            (PCI_IO_END - PCI_IO_SIZE)
  57 #define FIXADDR_TOP             (VMEMMAP_START - SZ_32M)
  58
  59 #if VA_BITS > 48
  60 #define VA_BITS_MIN             (48)
  61 #else
  62 #define VA_BITS_MIN             (VA_BITS)
  63 #endif
  64
  65 #define _PAGE_END(va)           (-(UL(1) << ((va) - 1)))
  66
  67 #define KERNEL_START            _text
  68 #define KERNEL_END              _end
  69
  70 /*
  71  * Generic and tag-based KASAN require 1/8th and 1/16th of the kernel virtual
  72  * address space for the shadow region respectively. They can bloat the stack
  73  * significantly, so double the (minimum) stack size when they are in use.
  74  */
  75 #if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
  76 #define KASAN_SHADOW_OFFSET     _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
  77 #define KASAN_SHADOW_END        ((UL(1) << (64 - KASAN_SHADOW_SCALE_SHIFT)) \
  78                                         + KASAN_SHADOW_OFFSET)
  79 #define PAGE_END                (KASAN_SHADOW_END - (1UL << (vabits_actual - KASAN_SHADOW_SCALE_SHIFT)))
  80 #define KASAN_THREAD_SHIFT      1
  81 #else
  82 #define KASAN_THREAD_SHIFT      0
  83 #define PAGE_END                (_PAGE_END(VA_BITS_MIN))
  84 #endif /* CONFIG_KASAN */
  85
  86 #define MIN_THREAD_SHIFT        (14 + KASAN_THREAD_SHIFT)
  87
  88 /*
  89  * VMAP'd stacks are allocated at page granularity, so we must ensure that such
  90  * stacks are a multiple of page size.
  91  */
  92 #if defined(CONFIG_VMAP_STACK) && (MIN_THREAD_SHIFT < PAGE_SHIFT)
  93 #define THREAD_SHIFT            PAGE_SHIFT
  94 #else
  95 #define THREAD_SHIFT            MIN_THREAD_SHIFT
  96 #endif
  97
  98 #if THREAD_SHIFT >= PAGE_SHIFT
  99 #define THREAD_SIZE_ORDER       (THREAD_SHIFT - PAGE_SHIFT)
 100 #endif
 101
 102 #define THREAD_SIZE             (UL(1) << THREAD_SHIFT)
 103
 104 /*
 105  * By aligning VMAP'd stacks to 2 * THREAD_SIZE, we can detect overflow by
 106  * checking sp & (1 << THREAD_SHIFT), which we can do cheaply in the entry
 107  * assembly.
 108  */
 109 #ifdef CONFIG_VMAP_STACK
 110 #define THREAD_ALIGN            (2 * THREAD_SIZE)
 111 #else
 112 #define THREAD_ALIGN            THREAD_SIZE
 113 #endif
 114
 115 #define IRQ_STACK_SIZE          THREAD_SIZE
 116
 117 #define OVERFLOW_STACK_SIZE     SZ_4K
 118
 119 /*
 120  * Alignment of kernel segments (e.g. .text, .data).
 121  *
 122  *  4 KB granule:  16 level 3 entries, with contiguous bit
 123  * 16 KB granule:   4 level 3 entries, without contiguous bit
 124  * 64 KB granule:   1 level 3 entry
 125  */
 126 #define SEGMENT_ALIGN           SZ_64K
 127
 128 /*
 129  * Memory types available.
 130  *
 131  * IMPORTANT: MT_NORMAL must be index 0 since vm_get_page_prot() may 'or' in
 132  *            the MT_NORMAL_TAGGED memory type for PROT_MTE mappings. Note
 133  *            that protection_map[] only contains MT_NORMAL attributes.
 134  */
 135 #define MT_NORMAL               0
 136 #define MT_NORMAL_TAGGED        1
 137 #define MT_NORMAL_NC            2
 138 #define MT_NORMAL_WT            3
 139 #define MT_DEVICE_nGnRnE        4
 140 #define MT_DEVICE_nGnRE         5
 141 #define MT_DEVICE_GRE           6
 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 #ifndef __ASSEMBLY__
 163
 164 #include <linux/bitops.h>
 165 #include <linux/compiler.h>
 166 #include <linux/mmdebug.h>
 167 #include <linux/types.h>
 168 #include <asm/bug.h>
 169
 170 extern u64                      vabits_actual;
 171
 172 extern s64                      memstart_addr;
 173 /* PHYS_OFFSET - the physical address of the start of memory. */
 174 #define PHYS_OFFSET             ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
 175
 176 /* the virtual base of the kernel image */
 177 extern u64                      kimage_vaddr;
 178
 179 /* the offset between the kernel virtual and physical mappings */
 180 extern u64                      kimage_voffset;
 181
 182 static inline unsigned long kaslr_offset(void)
 183 {
 184         return kimage_vaddr - KIMAGE_VADDR;
 185 }
 186
 187 /*
 188  * Allow all memory at the discovery stage. We will clip it later.
 189  */
 190 #define MIN_MEMBLOCK_ADDR       0
 191 #define MAX_MEMBLOCK_ADDR       U64_MAX
 192
 193 /*
 194  * PFNs are used to describe any physical page; this means
 195  * PFN 0 == physical address 0.
 196  *
 197  * This is the PFN of the first RAM page in the kernel
 198  * direct-mapped view.  We assume this is the first page
 199  * of RAM in the mem_map as well.
 200  */
 201 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
 202
 203 /*
 204  * When dealing with data aborts, watchpoints, or instruction traps we may end
 205  * up with a tagged userland pointer. Clear the tag to get a sane pointer to
 206  * pass on to access_ok(), for instance.
 207  */
 208 #define __untagged_addr(addr)   \
 209         ((__force __typeof__(addr))sign_extend64((__force u64)(addr), 55))
 210
 211 #define untagged_addr(addr)     ({                                      \
 212         u64 __addr = (__force u64)(addr);                                       \
 213         __addr &= __untagged_addr(__addr);                              \
 214         (__force __typeof__(addr))__addr;                               \
 215 })
 216
 217 #if defined(CONFIG_KASAN_SW_TAGS) || defined(CONFIG_KASAN_HW_TAGS)
 218 #define __tag_shifted(tag)      ((u64)(tag) << 56)
 219 #define __tag_reset(addr)       __untagged_addr(addr)
 220 #define __tag_get(addr)         (__u8)((u64)(addr) >> 56)
 221 #else
 222 #define __tag_shifted(tag)      0UL
 223 #define __tag_reset(addr)       (addr)
 224 #define __tag_get(addr)         0
 225 #endif /* CONFIG_KASAN_SW_TAGS || CONFIG_KASAN_HW_TAGS */
 226
 227 static inline const void *__tag_set(const void *addr, u8 tag)
 228 {
 229         u64 __addr = (u64)addr & ~__tag_shifted(0xff);
 230         return (const void *)(__addr | __tag_shifted(tag));
 231 }
 232
 233 #ifdef CONFIG_KASAN_HW_TAGS
 234 #define arch_enable_tagging()                   mte_enable_kernel()
 235 #define arch_init_tags(max_tag)                 mte_init_tags(max_tag)
 236 #define arch_get_random_tag()                   mte_get_random_tag()
 237 #define arch_get_mem_tag(addr)                  mte_get_mem_tag(addr)
 238 #define arch_set_mem_tag_range(addr, size, tag) \
 239                         mte_set_mem_tag_range((addr), (size), (tag))
 240 #endif /* CONFIG_KASAN_HW_TAGS */
 241
 242 /*
 243  * Physical vs virtual RAM address space conversion.  These are
 244  * private definitions which should NOT be used outside memory.h
 245  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 246  */
 247
 248
 249 /*
 250  * The linear kernel range starts at the bottom of the virtual address space.
 251  */
 252 #define __is_lm_address(addr)   (((u64)(addr) & ~PAGE_OFFSET) < (PAGE_END - PAGE_OFFSET))
 253
 254 #define __lm_to_phys(addr)      (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET)
 255 #define __kimg_to_phys(addr)    ((addr) - kimage_voffset)
 256
 257 #define __virt_to_phys_nodebug(x) ({                                    \
 258         phys_addr_t __x = (phys_addr_t)(__tag_reset(x));                \
 259         __is_lm_address(__x) ? __lm_to_phys(__x) : __kimg_to_phys(__x); \
 260 })
 261
 262 #define __pa_symbol_nodebug(x)  __kimg_to_phys((phys_addr_t)(x))
 263
 264 #ifdef CONFIG_DEBUG_VIRTUAL
 265 extern phys_addr_t __virt_to_phys(unsigned long x);
 266 extern phys_addr_t __phys_addr_symbol(unsigned long x);
 267 #else
 268 #define __virt_to_phys(x)       __virt_to_phys_nodebug(x)
 269 #define __phys_addr_symbol(x)   __pa_symbol_nodebug(x)
 270 #endif /* CONFIG_DEBUG_VIRTUAL */
 271
 272 #define __phys_to_virt(x)       ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
 273 #define __phys_to_kimg(x)       ((unsigned long)((x) + kimage_voffset))
 274
 275 /*
 276  * Convert a page to/from a physical address
 277  */
 278 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
 279 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
 280
 281 /*
 282  * Note: Drivers should NOT use these.  They are the wrong
 283  * translation for translating DMA addresses.  Use the driver
 284  * DMA support - see dma-mapping.h.
 285  */
 286 #define virt_to_phys virt_to_phys
 287 static inline phys_addr_t virt_to_phys(const volatile void *x)
 288 {
 289         return __virt_to_phys((unsigned long)(x));
 290 }
 291
 292 #define phys_to_virt phys_to_virt
 293 static inline void *phys_to_virt(phys_addr_t x)
 294 {
 295         return (void *)(__phys_to_virt(x));
 296 }
 297
 298 /*
 299  * Drivers should NOT use these either.
 300  */
 301 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 302 #define __pa_symbol(x)          __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0))
 303 #define __pa_nodebug(x)         __virt_to_phys_nodebug((unsigned long)(x))
 304 #define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
 305 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 306 #define virt_to_pfn(x)          __phys_to_pfn(__virt_to_phys((unsigned long)(x)))
 307 #define sym_to_pfn(x)           __phys_to_pfn(__pa_symbol(x))
 308
 309 /*
 310  *  virt_to_page(x)     convert a _valid_ virtual address to struct page *
 311  *  virt_addr_valid(x)  indicates whether a virtual address is valid
 312  */
 313 #define ARCH_PFN_OFFSET         ((unsigned long)PHYS_PFN_OFFSET)
 314
 315 #if !defined(CONFIG_SPARSEMEM_VMEMMAP) || defined(CONFIG_DEBUG_VIRTUAL)
 316 #define virt_to_page(x)         pfn_to_page(virt_to_pfn(x))
 317 #else
 318 #define page_to_virt(x) ({                                              \
 319         __typeof__(x) __page = x;                                       \
 320         u64 __idx = ((u64)__page - VMEMMAP_START) / sizeof(struct page);\
 321         u64 __addr = PAGE_OFFSET + (__idx * PAGE_SIZE);                 \
 322         (void *)__tag_set((const void *)__addr, page_kasan_tag(__page));\
 323 })
 324
 325 #define virt_to_page(x) ({                                              \
 326         u64 __idx = (__tag_reset((u64)x) - PAGE_OFFSET) / PAGE_SIZE;    \
 327         u64 __addr = VMEMMAP_START + (__idx * sizeof(struct page));     \
 328         (struct page *)__addr;                                          \
 329 })
 330 #endif /* !CONFIG_SPARSEMEM_VMEMMAP || CONFIG_DEBUG_VIRTUAL */
 331
 332 #define virt_addr_valid(addr)   ({                                      \
 333         __typeof__(addr) __addr = addr;                                 \
 334         __is_lm_address(__addr) && pfn_valid(virt_to_pfn(__addr));      \
 335 })
 336
 337 void dump_mem_limit(void);
 338 #endif /* !ASSEMBLY */
 339
 340 /*
 341  * Given that the GIC architecture permits ITS implementations that can only be
 342  * configured with a LPI table address once, GICv3 systems with many CPUs may
 343  * end up reserving a lot of different regions after a kexec for their LPI
 344  * tables (one per CPU), as we are forced to reuse the same memory after kexec
 345  * (and thus reserve it persistently with EFI beforehand)
 346  */
 347 #if defined(CONFIG_EFI) && defined(CONFIG_ARM_GIC_V3_ITS)
 348 # define INIT_MEMBLOCK_RESERVED_REGIONS (INIT_MEMBLOCK_REGIONS + NR_CPUS + 1)
 349 #endif
 350
 351 #include <asm-generic/memory_model.h>
 352
 353 #endif /* __ASM_MEMORY_H */