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 169