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 * Log2 of the upper bound of the size of a struct page. Used for sizing 44 * the vmemmap region only, does not affect actual memory footprint. 45 * We don't use sizeof(struct page) directly since taking its size here 46 * requires its definition to be available at this point in the inclusion 47 * chain, and it may not be a power of 2 in the first place. 48 */ 49#define STRUCT_PAGE_MAX_SHIFT 6 50 51/* 52 * VMEMMAP_SIZE - allows the whole linear region to be covered by 53 * a struct page array 54 */ 55#define VMEMMAP_SIZE (UL(1) << (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT)) 56 57/* 58 * PAGE_OFFSET - the virtual address of the start of the linear map (top 59 * (VA_BITS - 1)) 60 * KIMAGE_VADDR - the virtual address of the start of the kernel image 61 * VA_BITS - the maximum number of bits for virtual addresses. 62 * VA_START - the first kernel virtual address. 63 * TASK_SIZE - the maximum size of a user space task. 64 * TASK_UNMAPPED_BASE - the lower boundary of the mmap VM area. 65 */ 66#define VA_BITS (CONFIG_ARM64_VA_BITS) 67#define VA_START (UL(0xffffffffffffffff) << VA_BITS) 68#define PAGE_OFFSET (UL(0xffffffffffffffff) << (VA_BITS - 1)) 69#define KIMAGE_VADDR (MODULES_END) 70#define MODULES_END (MODULES_VADDR + MODULES_VSIZE) 71#define MODULES_VADDR (VA_START + KASAN_SHADOW_SIZE) 72#define MODULES_VSIZE (SZ_128M) 73#define VMEMMAP_START (PAGE_OFFSET - VMEMMAP_SIZE) 74#define PCI_IO_END (VMEMMAP_START - SZ_2M) 75#define PCI_IO_START (PCI_IO_END - PCI_IO_SIZE) 76#define FIXADDR_TOP (PCI_IO_START - SZ_2M) 77#define TASK_SIZE_64 (UL(1) << VA_BITS) 78 79#ifdef CONFIG_COMPAT 80#define TASK_SIZE_32 UL(0x100000000) 81#define TASK_SIZE (test_thread_flag(TIF_32BIT) ? \ 82 TASK_SIZE_32 : TASK_SIZE_64) 83#define TASK_SIZE_OF(tsk) (test_tsk_thread_flag(tsk, TIF_32BIT) ? \ 84 TASK_SIZE_32 : TASK_SIZE_64) 85#else 86#define TASK_SIZE TASK_SIZE_64 87#endif /* CONFIG_COMPAT */ 88 89#define TASK_UNMAPPED_BASE (PAGE_ALIGN(TASK_SIZE / 4)) 90 91#define KERNEL_START _text 92#define KERNEL_END _end 93 94/* 95 * The size of the KASAN shadow region. This should be 1/8th of the 96 * size of the entire kernel virtual address space. 97 */ 98#ifdef CONFIG_KASAN 99#define KASAN_SHADOW_SIZE (UL(1) << (VA_BITS - 3)) 100#else 101#define KASAN_SHADOW_SIZE (0) 102#endif 103 104/* 105 * Memory types available. 106 */ 107#define MT_DEVICE_nGnRnE 0 108#define MT_DEVICE_nGnRE 1 109#define MT_DEVICE_GRE 2 110#define MT_NORMAL_NC 3 111#define MT_NORMAL 4 112#define MT_NORMAL_WT 5 113 114/* 115 * Memory types for Stage-2 translation 116 */ 117#define MT_S2_NORMAL 0xf 118#define MT_S2_DEVICE_nGnRE 0x1 119 120#ifdef CONFIG_ARM64_4K_PAGES 121#define IOREMAP_MAX_ORDER (PUD_SHIFT) 122#else 123#define IOREMAP_MAX_ORDER (PMD_SHIFT) 124#endif 125 126#ifdef CONFIG_BLK_DEV_INITRD 127#define __early_init_dt_declare_initrd(__start, __end) \ 128 do { \ 129 initrd_start = (__start); \ 130 initrd_end = (__end); \ 131 } while (0) 132#endif 133 134#ifndef __ASSEMBLY__ 135 136#include <linux/bitops.h> 137#include <linux/mmdebug.h> 138 139extern s64 memstart_addr; 140/* PHYS_OFFSET - the physical address of the start of memory. */ 141#define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; }) 142 143/* the virtual base of the kernel image (minus TEXT_OFFSET) */ 144extern u64 kimage_vaddr; 145 146/* the offset between the kernel virtual and physical mappings */ 147extern u64 kimage_voffset; 148 149static inline unsigned long kaslr_offset(void) 150{ 151 return kimage_vaddr - KIMAGE_VADDR; 152} 153 154/* 155 * Allow all memory at the discovery stage. We will clip it later. 156 */ 157#define MIN_MEMBLOCK_ADDR 0 158#define MAX_MEMBLOCK_ADDR U64_MAX 159 160/* 161 * PFNs are used to describe any physical page; this means 162 * PFN 0 == physical address 0. 163 * 164 * This is the PFN of the first RAM page in the kernel 165 * direct-mapped view. We assume this is the first page 166 * of RAM in the mem_map as well. 167 */ 168#define PHYS_PFN_OFFSET (PHYS_OFFSET >> PAGE_SHIFT) 169 170/* 171 * Physical vs virtual RAM address space conversion. These are 172 * private definitions which should NOT be used outside memory.h 173 * files. Use virt_to_phys/phys_to_virt/__pa/__va instead. 174 */ 175 176 177/* 178 * The linear kernel range starts in the middle of the virtual adddress 179 * space. Testing the top bit for the start of the region is a 180 * sufficient check. 181 */ 182#define __is_lm_address(addr) (!!((addr) & BIT(VA_BITS - 1))) 183 184#define __lm_to_phys(addr) (((addr) & ~PAGE_OFFSET) + PHYS_OFFSET) 185#define __kimg_to_phys(addr) ((addr) - kimage_voffset) 186 187#define __virt_to_phys_nodebug(x) ({ \ 188 phys_addr_t __x = (phys_addr_t)(x); \ 189 __is_lm_address(__x) ? __lm_to_phys(__x) : \ 190 __kimg_to_phys(__x); \ 191}) 192 193#define __pa_symbol_nodebug(x) __kimg_to_phys((phys_addr_t)(x)) 194 195#ifdef CONFIG_DEBUG_VIRTUAL 196extern phys_addr_t __virt_to_phys(unsigned long x); 197extern phys_addr_t __phys_addr_symbol(unsigned long x); 198#else 199#define __virt_to_phys(x) __virt_to_phys_nodebug(x) 200#define __phys_addr_symbol(x) __pa_symbol_nodebug(x) 201#endif 202 203#define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET) | PAGE_OFFSET) 204#define __phys_to_kimg(x) ((unsigned long)((x) + kimage_voffset)) 205 206/* 207 * Convert a page to/from a physical address 208 */ 209#define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page))) 210#define phys_to_page(phys) (pfn_to_page(__phys_to_pfn(phys))) 211 212/* 213 * Note: Drivers should NOT use these. They are the wrong 214 * translation for translating DMA addresses. Use the driver 215 * DMA support - see dma-mapping.h. 216 */ 217#define virt_to_phys virt_to_phys 218static inline phys_addr_t virt_to_phys(const volatile void *x) 219{ 220 return __virt_to_phys((unsigned long)(x)); 221} 222 223#define phys_to_virt phys_to_virt 224static inline void *phys_to_virt(phys_addr_t x) 225{ 226 return (void *)(__phys_to_virt(x)); 227} 228 229/* 230 * Drivers should NOT use these either. 231 */ 232#define __pa(x) __virt_to_phys((unsigned long)(x)) 233#define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 234#define __pa_nodebug(x) __virt_to_phys_nodebug((unsigned long)(x)) 235#define __va(x) ((void *)__phys_to_virt((phys_addr_t)(x))) 236#define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 237#define virt_to_pfn(x) __phys_to_pfn(__virt_to_phys((unsigned long)(x))) 238#define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 239 240/* 241 * virt_to_page(k) convert a _valid_ virtual address to struct page * 242 * virt_addr_valid(k) indicates whether a virtual address is valid 243 */ 244#define ARCH_PFN_OFFSET ((unsigned long)PHYS_PFN_OFFSET) 245 246#ifndef CONFIG_SPARSEMEM_VMEMMAP 247#define virt_to_page(kaddr) pfn_to_page(__pa(kaddr) >> PAGE_SHIFT) 248#define _virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT) 249#else 250#define __virt_to_pgoff(kaddr) (((u64)(kaddr) & ~PAGE_OFFSET) / PAGE_SIZE * sizeof(struct page)) 251#define __page_to_voff(kaddr) (((u64)(kaddr) & ~VMEMMAP_START) * PAGE_SIZE / sizeof(struct page)) 252 253#define page_to_virt(page) ((void *)((__page_to_voff(page)) | PAGE_OFFSET)) 254#define virt_to_page(vaddr) ((struct page *)((__virt_to_pgoff(vaddr)) | VMEMMAP_START)) 255 256#define _virt_addr_valid(kaddr) pfn_valid((((u64)(kaddr) & ~PAGE_OFFSET) \ 257 + PHYS_OFFSET) >> PAGE_SHIFT) 258#endif 259#endif 260 261#define _virt_addr_is_linear(kaddr) (((u64)(kaddr)) >= PAGE_OFFSET) 262#define virt_addr_valid(kaddr) (_virt_addr_is_linear(kaddr) && \ 263 _virt_addr_valid(kaddr)) 264 265#include <asm-generic/memory_model.h> 266 267#endif 268