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  * Size of the PCI I/O space. This must remain a power of two so that
  37  * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses.
  38  */
  39 #define PCI_IO_SIZE             SZ_16M
  40
  41 /*
  42  * PAGE_OFFSET - the virtual address of the start of the kernel image (top
  43  *               (VA_BITS - 1))
  44  * VA_BITS - the maximum number of bits for virtual addresses.
  45  * VA_START - the first kernel virtual address.
  46  * TASK_SIZE - the maximum size of a user space task.
  47  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
  48  * The module space lives between the addresses given by TASK_SIZE
  49  * and PAGE_OFFSET - it must be within 128MB of the kernel text.
  50  */
  51 #define VA_BITS                 (CONFIG_ARM64_VA_BITS)
  52 #define VA_START                (UL(0xffffffffffffffff) << VA_BITS)
  53 #define PAGE_OFFSET             (UL(0xffffffffffffffff) << (VA_BITS - 1))
  54 #define MODULES_END             (PAGE_OFFSET)
  55 #define MODULES_VADDR           (MODULES_END - SZ_64M)
  56 #define PCI_IO_END              (MODULES_VADDR - SZ_2M)
  57 #define PCI_IO_START            (PCI_IO_END - PCI_IO_SIZE)
  58 #define FIXADDR_TOP             (PCI_IO_START - SZ_2M)
  59 #define TASK_SIZE_64            (UL(1) << VA_BITS)
  60
  61 #ifdef CONFIG_COMPAT
  62 #define TASK_SIZE_32            UL(0x100000000)
  63 #define TASK_SIZE               (test_thread_flag(TIF_32BIT) ? \
  64                                 TASK_SIZE_32 : TASK_SIZE_64)
  65 #define TASK_SIZE_OF(tsk)       (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
  66                                 TASK_SIZE_32 : TASK_SIZE_64)
  67 #else
  68 #define TASK_SIZE               TASK_SIZE_64
  69 #endif /* CONFIG_COMPAT */
  70
  71 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 4))
  72
  73 #if TASK_SIZE_64 > MODULES_VADDR
  74 #error Top of 64-bit user space clashes with start of module space
  75 #endif
  76
  77 /*
  78  * Physical vs virtual RAM address space conversion.  These are
  79  * private definitions which should NOT be used outside memory.h
  80  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
  81  */
  82 #define __virt_to_phys(x)       (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET))
  83 #define __phys_to_virt(x)       ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
  84
  85 /*
  86  * Convert a page to/from a physical address
  87  */
  88 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
  89 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
  90
  91 /*
  92  * Memory types available.
  93  */
  94 #define MT_DEVICE_nGnRnE        0
  95 #define MT_DEVICE_nGnRE         1
  96 #define MT_DEVICE_GRE           2
  97 #define MT_NORMAL_NC            3
  98 #define MT_NORMAL               4
  99
 100 /*
 101  * Memory types for Stage-2 translation
 102  */
 103 #define MT_S2_NORMAL            0xf
 104 #define MT_S2_DEVICE_nGnRE      0x1
 105
 106 #ifndef __ASSEMBLY__
 107
 108 extern phys_addr_t              memstart_addr;
 109 /* PHYS_OFFSET - the physical address of the start of memory. */
 110 #define PHYS_OFFSET             ({ memstart_addr; })
 111
 112 /*
 113  * The maximum physical address that the linear direct mapping
 114  * of system RAM can cover. (PAGE_OFFSET can be interpreted as
 115  * a 2's complement signed quantity and negated to derive the
 116  * maximum size of the linear mapping.)
 117  */
 118 #define MAX_MEMBLOCK_ADDR       ({ memstart_addr - PAGE_OFFSET - 1; })
 119
 120 /*
 121  * PFNs are used to describe any physical page; this means
 122  * PFN 0 == physical address 0.
 123  *
 124  * This is the PFN of the first RAM page in the kernel
 125  * direct-mapped view.  We assume this is the first page
 126  * of RAM in the mem_map as well.
 127  */
 128 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
 129
 130 /*
 131  * Note: Drivers should NOT use these.  They are the wrong
 132  * translation for translating DMA addresses.  Use the driver
 133  * DMA support - see dma-mapping.h.
 134  */
 135 #define virt_to_phys virt_to_phys
 136 static inline phys_addr_t virt_to_phys(const volatile void *x)
 137 {
 138         return __virt_to_phys((unsigned long)(x));
 139 }
 140
 141 #define phys_to_virt phys_to_virt
 142 static inline void *phys_to_virt(phys_addr_t x)
 143 {
 144         return (void *)(__phys_to_virt(x));
 145 }
 146
 147 /*
 148  * Drivers should NOT use these either.
 149  */
 150 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
 151 #define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
 152 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
 153 #define virt_to_pfn(x)      __phys_to_pfn(__virt_to_phys(x))
 154
 155 /*
 156  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
 157  *  virt_addr_valid(k)  indicates whether a virtual address is valid
 158  */
 159 #define ARCH_PFN_OFFSET         ((unsigned long)PHYS_PFN_OFFSET)
 160
 161 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
 162 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
 163
 164 #endif
 165
 166 #include <asm-generic/memory_model.h>
 167
 168 #endif