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/sizes.h>
  28
  29 /*
  30  * Allow for constants defined here to be used from assembly code
  31  * by prepending the UL suffix only with actual C code compilation.
  32  */
  33 #define UL(x) _AC(x, UL)
  34
  35 /*
  36  * PAGE_OFFSET - the virtual address of the start of the kernel image (top
  37  *               (VA_BITS - 1))
  38  * VA_BITS - the maximum number of bits for virtual addresses.
  39  * TASK_SIZE - the maximum size of a user space task.
  40  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
  41  * The module space lives between the addresses given by TASK_SIZE
  42  * and PAGE_OFFSET - it must be within 128MB of the kernel text.
  43  */
  44 #ifdef CONFIG_ARM64_64K_PAGES
  45 #define VA_BITS                 (42)
  46 #else
  47 #define VA_BITS                 (39)
  48 #endif
  49 #define PAGE_OFFSET             (UL(0xffffffffffffffff) << (VA_BITS - 1))
  50 #define MODULES_END             (PAGE_OFFSET)
  51 #define MODULES_VADDR           (MODULES_END - SZ_64M)
  52 #define EARLYCON_IOBASE         (MODULES_VADDR - SZ_4M)
  53 #define TASK_SIZE_64            (UL(1) << VA_BITS)
  54
  55 #ifdef CONFIG_COMPAT
  56 #define TASK_SIZE_32            UL(0x100000000)
  57 #define TASK_SIZE               (test_thread_flag(TIF_32BIT) ? \
  58                                 TASK_SIZE_32 : TASK_SIZE_64)
  59 #else
  60 #define TASK_SIZE               TASK_SIZE_64
  61 #endif /* CONFIG_COMPAT */
  62
  63 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 4))
  64
  65 #if TASK_SIZE_64 > MODULES_VADDR
  66 #error Top of 64-bit user space clashes with start of module space
  67 #endif
  68
  69 /*
  70  * Physical vs virtual RAM address space conversion.  These are
  71  * private definitions which should NOT be used outside memory.h
  72  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
  73  */
  74 #define __virt_to_phys(x)       (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET))
  75 #define __phys_to_virt(x)       ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
  76
  77 /*
  78  * Convert a physical address to a Page Frame Number and back
  79  */
  80 #define __phys_to_pfn(paddr)    ((unsigned long)((paddr) >> PAGE_SHIFT))
  81 #define __pfn_to_phys(pfn)      ((phys_addr_t)(pfn) << PAGE_SHIFT)
  82
  83 /*
  84  * Convert a page to/from a physical address
  85  */
  86 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
  87 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
  88
  89 /*
  90  * Memory types available.
  91  */
  92 #define MT_DEVICE_nGnRnE        0
  93 #define MT_DEVICE_nGnRE         1
  94 #define MT_DEVICE_GRE           2
  95 #define MT_NORMAL_NC            3
  96 #define MT_NORMAL               4
  97
  98 /*
  99  * Memory types for Stage-2 translation
 100  */
 101 #define MT_S2_NORMAL            0xf
 102 #define MT_S2_DEVICE_nGnRE      0x1
 103
 104 #ifndef __ASSEMBLY__
 105
 106 extern phys_addr_t              memstart_addr;
 107 /* PHYS_OFFSET - the physical address of the start of memory. */
 108 #define PHYS_OFFSET             ({ memstart_addr; })
 109
 110 /*
 111  * PFNs are used to describe any physical page; this means
 112  * PFN 0 == physical address 0.
 113  *
 114  * This is the PFN of the first RAM page in the kernel
 115  * direct-mapped view.  We assume this is the first page
 116  * of RAM in the mem_map as well.
 117  */
 118 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
 119
 120 /*
 121  * Note: Drivers should NOT use these.  They are the wrong
 122  * translation for translating DMA addresses.  Use the driver
 123  * DMA support - see dma-mapping.h.
 124  */
 125 static inline phys_addr_t virt_to_phys(const volatile void *x)
 126 {
 127         return __virt_to_phys((unsigned long)(x));
 128 }
 129
 130 static inline void *phys_to_virt(phys_addr_t x)
 131 {
 132         return (void *)(__phys_to_virt(x));
 133 }
 134
 135 /*
 136  * Drivers should NOT use these either.
 137  */
 138 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 139 #define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
 140 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 141
 142 /*
 143  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 144  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 145  */
 146 #define ARCH_PFN_OFFSET         PHYS_PFN_OFFSET
 147
 148 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 149 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 150
 151 #endif
 152
 153 #include <asm-generic/memory_model.h>
 154
 155 #endif