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Linux/arch/arm64/include/asm/memory.h

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  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  * TASK_SIZE - the maximum size of a user space task.
 46  * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area.
 47  * The module space lives between the addresses given by TASK_SIZE
 48  * and PAGE_OFFSET - it must be within 128MB of the kernel text.
 49  */
 50 #define VA_BITS                 (CONFIG_ARM64_VA_BITS)
 51 #define PAGE_OFFSET             (UL(0xffffffffffffffff) << (VA_BITS - 1))
 52 #define MODULES_END             (PAGE_OFFSET)
 53 #define MODULES_VADDR           (MODULES_END - SZ_64M)
 54 #define PCI_IO_END              (MODULES_VADDR - SZ_2M)
 55 #define PCI_IO_START            (PCI_IO_END - PCI_IO_SIZE)
 56 #define FIXADDR_TOP             (PCI_IO_START - SZ_2M)
 57 #define TASK_SIZE_64            (UL(1) << VA_BITS)
 58 
 59 #ifdef CONFIG_COMPAT
 60 #define TASK_SIZE_32            UL(0x100000000)
 61 #define TASK_SIZE               (test_thread_flag(TIF_32BIT) ? \
 62                                 TASK_SIZE_32 : TASK_SIZE_64)
 63 #define TASK_SIZE_OF(tsk)       (test_tsk_thread_flag(tsk, TIF_32BIT) ? \
 64                                 TASK_SIZE_32 : TASK_SIZE_64)
 65 #else
 66 #define TASK_SIZE               TASK_SIZE_64
 67 #endif /* CONFIG_COMPAT */
 68 
 69 #define TASK_UNMAPPED_BASE      (PAGE_ALIGN(TASK_SIZE / 4))
 70 
 71 #if TASK_SIZE_64 > MODULES_VADDR
 72 #error Top of 64-bit user space clashes with start of module space
 73 #endif
 74 
 75 /*
 76  * Physical vs virtual RAM address space conversion.  These are
 77  * private definitions which should NOT be used outside memory.h
 78  * files.  Use virt_to_phys/phys_to_virt/__pa/__va instead.
 79  */
 80 #define __virt_to_phys(x)       (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET))
 81 #define __phys_to_virt(x)       ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
 82 
 83 /*
 84  * Convert a physical address to a Page Frame Number and back
 85  */
 86 #define __phys_to_pfn(paddr)    ((unsigned long)((paddr) >> PAGE_SHIFT))
 87 #define __pfn_to_phys(pfn)      ((phys_addr_t)(pfn) << PAGE_SHIFT)
 88 
 89 /*
 90  * Convert a page to/from a physical address
 91  */
 92 #define page_to_phys(page)      (__pfn_to_phys(page_to_pfn(page)))
 93 #define phys_to_page(phys)      (pfn_to_page(__phys_to_pfn(phys)))
 94 
 95 /*
 96  * Memory types available.
 97  */
 98 #define MT_DEVICE_nGnRnE        0
 99 #define MT_DEVICE_nGnRE         1
100 #define MT_DEVICE_GRE           2
101 #define MT_NORMAL_NC            3
102 #define MT_NORMAL               4
103 
104 /*
105  * Memory types for Stage-2 translation
106  */
107 #define MT_S2_NORMAL            0xf
108 #define MT_S2_DEVICE_nGnRE      0x1
109 
110 #ifndef __ASSEMBLY__
111 
112 extern phys_addr_t              memstart_addr;
113 /* PHYS_OFFSET - the physical address of the start of memory. */
114 #define PHYS_OFFSET             ({ memstart_addr; })
115 
116 /*
117  * The maximum physical address that the linear direct mapping
118  * of system RAM can cover. (PAGE_OFFSET can be interpreted as
119  * a 2's complement signed quantity and negated to derive the
120  * maximum size of the linear mapping.)
121  */
122 #define MAX_MEMBLOCK_ADDR       ({ memstart_addr - PAGE_OFFSET - 1; })
123 
124 /*
125  * PFNs are used to describe any physical page; this means
126  * PFN 0 == physical address 0.
127  *
128  * This is the PFN of the first RAM page in the kernel
129  * direct-mapped view.  We assume this is the first page
130  * of RAM in the mem_map as well.
131  */
132 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT)
133 
134 /*
135  * Note: Drivers should NOT use these.  They are the wrong
136  * translation for translating DMA addresses.  Use the driver
137  * DMA support - see dma-mapping.h.
138  */
139 #define virt_to_phys virt_to_phys
140 static inline phys_addr_t virt_to_phys(const volatile void *x)
141 {
142         return __virt_to_phys((unsigned long)(x));
143 }
144 
145 #define phys_to_virt phys_to_virt
146 static inline void *phys_to_virt(phys_addr_t x)
147 {
148         return (void *)(__phys_to_virt(x));
149 }
150 
151 /*
152  * Drivers should NOT use these either.
153  */
154 #define __pa(x)                 __virt_to_phys((unsigned long)(x))
155 #define __va(x)                 ((void *)__phys_to_virt((phys_addr_t)(x)))
156 #define pfn_to_kaddr(pfn)       __va((pfn) << PAGE_SHIFT)
157 #define virt_to_pfn(x)      __phys_to_pfn(__virt_to_phys(x))
158 
159 /*
160  *  virt_to_page(k)     convert a _valid_ virtual address to struct page *
161  *  virt_addr_valid(k)  indicates whether a virtual address is valid
162  */
163 #define ARCH_PFN_OFFSET         ((unsigned long)PHYS_PFN_OFFSET)
164 
165 #define virt_to_page(kaddr)     pfn_to_page(__pa(kaddr) >> PAGE_SHIFT)
166 #define virt_addr_valid(kaddr)  pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
167 
168 #endif
169 
170 #include <asm-generic/memory_model.h>
171 
172 #endif
173 

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