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  * PAGE_OFFSET - the virtual address of the start of the kernel image (top
  44  *               (VA_BITS - 1))
  45  * VA_BITS - the maximum number of bits for virtual addresses.
  46  * VA_START - the first kernel virtual address.
  47  * TASK_SIZE - the maximum size of a user space task.
  48  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
  49  */
  50 #define VA_BITS                 (CONFIG_ARM64_VA_BITS)
  51 #define VA_START                (UL(0xffffffffffffffff) << VA_BITS)
  52 #define PAGE_OFFSET             (UL(0xffffffffffffffff) << (VA_BITS - 1))
  53 #define KIMAGE_VADDR            (MODULES_END)
  54 #define MODULES_END             (MODULES_VADDR + MODULES_VSIZE)
  55 #define MODULES_VADDR           (VA_START + KASAN_SHADOW_SIZE)
  56 #define MODULES_VSIZE           (SZ_64M)
  57 #define PCI_IO_END              (PAGE_OFFSET - SZ_2M)
  58 #define PCI_IO_START            (PCI_IO_END - PCI_IO_SIZE)
  59 #define FIXADDR_TOP             (PCI_IO_START - SZ_2M)
  60 #define TASK_SIZE_64            (UL(1) << VA_BITS)
  61
  62 #ifdef CONFIG_COMPAT
  63 #define TASK_SIZE_32            UL(0x100000000)
  64 #define TASK_SIZE               (test_thread_flag(TIF_32BIT) ? \
  65                                 TASK_SIZE_32 : TASK_SIZE_64)
  66 #define TASK_SIZE_OF(tsk)       (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
  67                                 TASK_SIZE_32 : TASK_SIZE_64)
  68 #else
  69 #define TASK_SIZE               TASK_SIZE_64
  70 #endif /* CONFIG_COMPAT */
  71
  72 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 4))
  73
  74 /*
  75  * The size of the KASAN shadow region. This should be 1/8th of the
  76  * size of the entire kernel virtual address space.
  77  */
  78 #ifdef CONFIG_KASAN
  79 #define KASAN_SHADOW_SIZE       (UL(1) << (VA_BITS - 3))
  80 #else
  81 #define KASAN_SHADOW_SIZE       (0)
  82 #endif
  83
  84 /*
  85  * Physical vs virtual RAM address space conversion.  These are
  86  * private definitions which should NOT be used outside memory.h
  87  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
  88  */
  89 #define __virt_to_phys(x) ({                                            \
  90         phys_addr_t __x = (phys_addr_t)(x);                             \
  91         __x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET :   \
  92                                  (__x - kimage_voffset); })
  93
  94 #define __phys_to_virt(x)       ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET)
  95 #define __phys_to_kimg(x)       ((unsigned long)((x) + kimage_voffset))
  96
  97 /*
  98  * Convert a page to/from a physical address
  99  */
 100 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
 101 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
 102
 103 /*
 104  * Memory types available.
 105  */
 106 #define MT_DEVICE_nGnRnE        0
 107 #define MT_DEVICE_nGnRE         1
 108 #define MT_DEVICE_GRE           2
 109 #define MT_NORMAL_NC            3
 110 #define MT_NORMAL               4
 111 #define MT_NORMAL_WT            5
 112
 113 /*
 114  * Memory types for Stage-2 translation
 115  */
 116 #define MT_S2_NORMAL            0xf
 117 #define MT_S2_DEVICE_nGnRE      0x1
 118
 119 #ifdef CONFIG_ARM64_4K_PAGES
 120 #define IOREMAP_MAX_ORDER       (PUD_SHIFT)
 121 #else
 122 #define IOREMAP_MAX_ORDER       (PMD_SHIFT)
 123 #endif
 124
 125 #ifdef CONFIG_BLK_DEV_INITRD
 126 #define __early_init_dt_declare_initrd(__start, __end)                  \
 127         do {                                                            \
 128                 initrd_start = (__start);                               \
 129                 initrd_end = (__end);                                   \
 130         } while (0)
 131 #endif
 132
 133 #ifndef __ASSEMBLY__
 134
 135 #include <linux/bitops.h>
 136 #include <linux/mmdebug.h>
 137
 138 extern phys_addr_t              memstart_addr;
 139 /* PHYS_OFFSET - the physical address of the start of memory. */
 140 #define PHYS_OFFSET             ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
 141
 142 /* the offset between the kernel virtual and physical mappings */
 143 extern u64                      kimage_voffset;
 144
 145 /*
 146  * Allow all memory at the discovery stage. We will clip it later.
 147  */
 148 #define MIN_MEMBLOCK_ADDR       0
 149 #define MAX_MEMBLOCK_ADDR       U64_MAX
 150
 151 /*
 152  * PFNs are used to describe any physical page; this means
 153  * PFN 0 == physical address 0.
 154  *
 155  * This is the PFN of the first RAM page in the kernel
 156  * direct-mapped view.  We assume this is the first page
 157  * of RAM in the mem_map as well.
 158  */
 159 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
 160
 161 /*
 162  * Note: Drivers should NOT use these.  They are the wrong
 163  * translation for translating DMA addresses.  Use the driver
 164  * DMA support - see dma-mapping.h.
 165  */
 166 #define virt_to_phys virt_to_phys
 167 static inline phys_addr_t virt_to_phys(const volatile void *x)
 168 {
 169         return __virt_to_phys((unsigned long)(x));
 170 }
 171
 172 #define phys_to_virt phys_to_virt
 173 static inline void *phys_to_virt(phys_addr_t x)
 174 {
 175         return (void *)(__phys_to_virt(x));
 176 }
 177
 178 /*
 179  * Drivers should NOT use these either.
 180  */
 181 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 182 #define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
 183 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 184 #define virt_to_pfn(x)      __phys_to_pfn(__virt_to_phys(x))
 185
 186 /*
 187  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 188  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 189  */
 190 #define ARCH_PFN_OFFSET         ((unsigned long)PHYS_PFN_OFFSET)
 191
 192 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 193 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 194
 195 #endif
 196
 197 #include <asm-generic/memory_model.h>
 198
 199 #endif