arch/arm64/include/asm/memory.h

   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