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/bug.h> 28 #include <asm/sizes.h> 29 30 /* 31 * Allow for constants defined here to be used from assembly code 32 * by prepending the UL suffix only with actual C code compilation. 33 */ 34 #define UL(x) _AC(x, UL) 35 36 /* 37 * Size of the PCI I/O space. This must remain a power of two so that 38 * IO_SPACE_LIMIT acts as a mask for the low bits of I/O addresses. 39 */ 40 #define PCI_IO_SIZE SZ_16M 41 42 /* 43 * PAGE_OFFSET - the virtual address of the start of the kernel image (top 44 * (VA_BITS - 1)) 45 * VA_BITS - the maximum number of bits for virtual addresses. 46 * VA_START - the first kernel virtual address. 47 * TASK_SIZE - the maximum size of a user space task. 48 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. 49 */ 50 #define VA_BITS (CONFIG_ARM64_VA_BITS) 51 #define VA_START (UL(0xffffffffffffffff) << VA_BITS) 52 #define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1)) 53 #define KIMAGE_VADDR (MODULES_END) 54 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE) 55 #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE) 56 #define MODULES_VSIZE (SZ_128M) 57 #define PCI_IO_END (PAGE_OFFSET - SZ_2M) 58 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) 59 #define FIXADDR_TOP (PCI_IO_START - SZ_2M) 60 #define TASK_SIZE_64 (UL(1) << VA_BITS) 61 62 #ifdef CONFIG_COMPAT 63 #define TASK_SIZE_32 UL(0x100000000) 64 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ 65 TASK_SIZE_32 : TASK_SIZE_64) 66 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ 67 TASK_SIZE_32 : TASK_SIZE_64) 68 #else 69 #define TASK_SIZE TASK_SIZE_64 70 #endif /* CONFIG_COMPAT */ 71 72 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) 73 74 /* 75 * The size of the KASAN shadow region. This should be 1/8th of the 76 * size of the entire kernel virtual address space. 77 */ 78 #ifdef CONFIG_KASAN 79 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3)) 80 #else 81 #define KASAN_SHADOW_SIZE (0) 82 #endif 83 84 /* 85 * Physical vs virtual RAM address space conversion. These are 86 * private definitions which should NOT be used outside memory.h 87 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 88 */ 89 #define __virt_to_phys(x) ({ \ 90 phys_addr_t __x = (phys_addr_t)(x); \ 91 __x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET : \ 92 (__x - kimage_voffset); }) 93 94 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) 95 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) 96 97 /* 98 * Convert a page to/from a physical address 99 */ 100 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 101 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 102 103 /* 104 * Memory types available. 105 */ 106 #define MT_DEVICE_nGnRnE 0 107 #define MT_DEVICE_nGnRE 1 108 #define MT_DEVICE_GRE 2 109 #define MT_NORMAL_NC 3 110 #define MT_NORMAL 4 111 #define MT_NORMAL_WT 5 112 113 /* 114 * Memory types for Stage-2 translation 115 */ 116 #define MT_S2_NORMAL 0xf 117 #define MT_S2_DEVICE_nGnRE 0x1 118 119 #ifdef CONFIG_ARM64_4K_PAGES 120 #define IOREMAP_MAX_ORDER (PUD_SHIFT) 121 #else 122 #define IOREMAP_MAX_ORDER (PMD_SHIFT) 123 #endif 124 125 #ifdef CONFIG_BLK_DEV_INITRD 126 #define __early_init_dt_declare_initrd(__start, __end) \ 127 do { \ 128 initrd_start = (__start); \ 129 initrd_end = (__end); \ 130 } while (0) 131 #endif 132 133 #ifndef __ASSEMBLY__ 134 135 #include <linux/bitops.h> 136 #include <linux/mmdebug.h> 137 138 extern s64 memstart_addr; 139 /* PHYS_OFFSET - the physical address of the start of memory. */ 140 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) 141 142 /* the virtual base of the kernel image (minus TEXT_OFFSET) */ 143 extern u64 kimage_vaddr; 144 145 /* the offset between the kernel virtual and physical mappings */ 146 extern u64 kimage_voffset; 147 148 /* 149 * Allow all memory at the discovery stage. We will clip it later. 150 */ 151 #define MIN_MEMBLOCK_ADDR 0 152 #define MAX_MEMBLOCK_ADDR U64_MAX 153 154 /* 155 * PFNs are used to describe any physical page; this means 156 * PFN 0 == physical address 0. 157 * 158 * This is the PFN of the first RAM page in the kernel 159 * direct-mapped view. We assume this is the first page 160 * of RAM in the mem_map as well. 161 */ 162 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 163 164 /* 165 * Note: Drivers should NOT use these. They are the wrong 166 * translation for translating DMA addresses. Use the driver 167 * DMA support - see dma-mapping.h. 168 */ 169 #define virt_to_phys virt_to_phys 170 static inline phys_addr_t virt_to_phys(const volatile void *x) 171 { 172 return __virt_to_phys((unsigned long)(x)); 173 } 174 175 #define phys_to_virt phys_to_virt 176 static inline void *phys_to_virt(phys_addr_t x) 177 { 178 return (void *)(__phys_to_virt(x)); 179 } 180 181 /* 182 * Drivers should NOT use these either. 183 */ 184 #define __pa(x) __virt_to_phys((unsigned long)(x)) 185 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 186 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 187 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x)) 188 189 /* 190 * virt_to_page(k) convert a _valid_ virtual address to struct page * 191 * virt_addr_valid(k) indicates whether a virtual address is valid 192 */ 193 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 194 195 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 196 #define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 197 198 #endif 199 200 #include <asm-generic/memory_model.h> 201 202 #endif 203