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 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 * The maximum physical address that the linear direct mapping 112 * of system RAM can cover. (PAGE_OFFSET can be interpreted as 113 * a 2's complement signed quantity and negated to derive the 114 * maximum size of the linear mapping.) 115 */ 116 #define MAX_MEMBLOCK_ADDR ({ memstart_addr - PAGE_OFFSET - 1; }) 117 118 /* 119 * PFNs are used to describe any physical page; this means 120 * PFN 0 == physical address 0. 121 * 122 * This is the PFN of the first RAM page in the kernel 123 * direct-mapped view. We assume this is the first page 124 * of RAM in the mem_map as well. 125 */ 126 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 127 128 /* 129 * Note: Drivers should NOT use these. They are the wrong 130 * translation for translating DMA addresses. Use the driver 131 * DMA support - see dma-mapping.h. 132 */ 133 #define virt_to_phys virt_to_phys 134 static inline phys_addr_t virt_to_phys(const volatile void *x) 135 { 136 return __virt_to_phys((unsigned long)(x)); 137 } 138 139 #define phys_to_virt phys_to_virt 140 static inline void *phys_to_virt(phys_addr_t x) 141 { 142 return (void *)(__phys_to_virt(x)); 143 } 144 145 /* 146 * Drivers should NOT use these either. 147 */ 148 #define __pa(x) __virt_to_phys((unsigned long)(x)) 149 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 150 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 151 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x)) 152 153 /* 154 * virt_to_page(k) convert a _valid_ virtual address to struct page * 155 * virt_addr_valid(k) indicates whether a virtual address is valid 156 */ 157 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 158 159 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 160 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 161 162 #endif 163 164 #include <asm-generic/memory_model.h> 165 166 #endif 167