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 FIXADDR_TOP (MODULES_VADDR - SZ_2M - PAGE_SIZE) 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 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ 60 TASK_SIZE_32 : TASK_SIZE_64) 61 #else 62 #define TASK_SIZE TASK_SIZE_64 63 #endif /* CONFIG_COMPAT */ 64 65 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) 66 67 #if TASK_SIZE_64 > MODULES_VADDR 68 #error Top of 64-bit user space clashes with start of module space 69 #endif 70 71 /* 72 * Physical vs virtual RAM address space conversion. These are 73 * private definitions which should NOT be used outside memory.h 74 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 75 */ 76 #define __virt_to_phys(x) (((phys_addr_t)(x) - PAGE_OFFSET + PHYS_OFFSET)) 77 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET)) 78 79 /* 80 * Convert a physical address to a Page Frame Number and back 81 */ 82 #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT)) 83 #define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT) 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 * PFNs are used to describe any physical page; this means 114 * PFN 0 == physical address 0. 115 * 116 * This is the PFN of the first RAM page in the kernel 117 * direct-mapped view. We assume this is the first page 118 * of RAM in the mem_map as well. 119 */ 120 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 121 122 /* 123 * Note: Drivers should NOT use these. They are the wrong 124 * translation for translating DMA addresses. Use the driver 125 * DMA support - see dma-mapping.h. 126 */ 127 static inline phys_addr_t virt_to_phys(const volatile void *x) 128 { 129 return __virt_to_phys((unsigned long)(x)); 130 } 131 132 static inline void *phys_to_virt(phys_addr_t x) 133 { 134 return (void *)(__phys_to_virt(x)); 135 } 136 137 /* 138 * Drivers should NOT use these either. 139 */ 140 #define __pa(x) __virt_to_phys((unsigned long)(x)) 141 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 142 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 143 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x)) 144 145 /* 146 * virt_to_page(k) convert a _valid_ virtual address to struct page * 147 * virt_addr_valid(k) indicates whether a virtual address is valid 148 */ 149 #define ARCH_PFN_OFFSET PHYS_PFN_OFFSET 150 151 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 152 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 153 154 #endif 155 156 #include <asm-generic/memory_model.h> 157 158 #endif 159