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) - \ 52 (UL(1) << VA_BITS) + 1) 53 #define PAGE_OFFSET (UL(0xffffffffffffffff) - \ 54 (UL(1) << (VA_BITS - 1)) + 1) 55 #define KIMAGE_VADDR (MODULES_END) 56 #define MODULES_END (MODULES_VADDR + MODULES_VSIZE) 57 #define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE) 58 #define MODULES_VSIZE (SZ_128M) 59 #define PCI_IO_END (PAGE_OFFSET - SZ_2M) 60 #define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) 61 #define FIXADDR_TOP (PCI_IO_START - SZ_2M) 62 #define TASK_SIZE_64 (UL(1) << VA_BITS) 63 64 #ifdef CONFIG_COMPAT 65 #define TASK_SIZE_32 UL(0x100000000) 66 #define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ 67 TASK_SIZE_32 : TASK_SIZE_64) 68 #define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ 69 TASK_SIZE_32 : TASK_SIZE_64) 70 #else 71 #define TASK_SIZE TASK_SIZE_64 72 #endif /* CONFIG_COMPAT */ 73 74 #define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) 75 76 /* 77 * The size of the KASAN shadow region. This should be 1/8th of the 78 * size of the entire kernel virtual address space. 79 */ 80 #ifdef CONFIG_KASAN 81 #define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3)) 82 #else 83 #define KASAN_SHADOW_SIZE (0) 84 #endif 85 86 /* 87 * Physical vs virtual RAM address space conversion. These are 88 * private definitions which should NOT be used outside memory.h 89 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 90 */ 91 #define __virt_to_phys(x) ({ \ 92 phys_addr_t __x = (phys_addr_t)(x); \ 93 __x & BIT(VA_BITS - 1) ? (__x & ~PAGE_OFFSET) + PHYS_OFFSET : \ 94 (__x - kimage_voffset); }) 95 96 #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) 97 #define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) 98 99 /* 100 * Convert a page to/from a physical address 101 */ 102 #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 103 #define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 104 105 /* 106 * Memory types available. 107 */ 108 #define MT_DEVICE_nGnRnE 0 109 #define MT_DEVICE_nGnRE 1 110 #define MT_DEVICE_GRE 2 111 #define MT_NORMAL_NC 3 112 #define MT_NORMAL 4 113 #define MT_NORMAL_WT 5 114 115 /* 116 * Memory types for Stage-2 translation 117 */ 118 #define MT_S2_NORMAL 0xf 119 #define MT_S2_DEVICE_nGnRE 0x1 120 121 #ifdef CONFIG_ARM64_4K_PAGES 122 #define IOREMAP_MAX_ORDER (PUD_SHIFT) 123 #else 124 #define IOREMAP_MAX_ORDER (PMD_SHIFT) 125 #endif 126 127 #ifdef CONFIG_BLK_DEV_INITRD 128 #define __early_init_dt_declare_initrd(__start, __end) \ 129 do { \ 130 initrd_start = (__start); \ 131 initrd_end = (__end); \ 132 } while (0) 133 #endif 134 135 #ifndef __ASSEMBLY__ 136 137 #include <linux/bitops.h> 138 #include <linux/mmdebug.h> 139 140 extern s64 memstart_addr; 141 /* PHYS_OFFSET - the physical address of the start of memory. */ 142 #define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) 143 144 /* the virtual base of the kernel image (minus TEXT_OFFSET) */ 145 extern u64 kimage_vaddr; 146 147 /* the offset between the kernel virtual and physical mappings */ 148 extern u64 kimage_voffset; 149 kaslr_offset(void)150static inline unsigned long kaslr_offset(void) 151 { 152 return kimage_vaddr - KIMAGE_VADDR; 153 } 154 155 /* 156 * Allow all memory at the discovery stage. We will clip it later. 157 */ 158 #define MIN_MEMBLOCK_ADDR 0 159 #define MAX_MEMBLOCK_ADDR U64_MAX 160 161 /* 162 * PFNs are used to describe any physical page; this means 163 * PFN 0 == physical address 0. 164 * 165 * This is the PFN of the first RAM page in the kernel 166 * direct-mapped view. We assume this is the first page 167 * of RAM in the mem_map as well. 168 */ 169 #define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 170 171 /* 172 * Note: Drivers should NOT use these. They are the wrong 173 * translation for translating DMA addresses. Use the driver 174 * DMA support - see dma-mapping.h. 175 */ 176 #define virt_to_phys virt_to_phys virt_to_phys(const volatile void * x)177static inline phys_addr_t virt_to_phys(const volatile void *x) 178 { 179 return __virt_to_phys((unsigned long)(x)); 180 } 181 182 #define phys_to_virt phys_to_virt phys_to_virt(phys_addr_t x)183static inline void *phys_to_virt(phys_addr_t x) 184 { 185 return (void *)(__phys_to_virt(x)); 186 } 187 188 /* 189 * Drivers should NOT use these either. 190 */ 191 #define __pa(x) __virt_to_phys((unsigned long)(x)) 192 #define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 193 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 194 #define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys(x)) 195 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 196 197 /* 198 * virt_to_page(k) convert a _valid_ virtual address to struct page * 199 * virt_addr_valid(k) indicates whether a virtual address is valid 200 */ 201 #define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 202 203 #define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 204 #define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 205 206 #define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET) 207 #define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \ 208 _virt_addr_valid(kaddr)) 209 210 #endif 211 212 #include <asm-generic/memory_model.h> 213 214 #endif 215