1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com> 4 * Copyright (C) 2012 Regents of the University of California 5 * Copyright (C) 2017 SiFive 6 * Copyright (C) 2017 XiaojingZhu <zhuxiaoj@ict.ac.cn> 7 */ 8 9 #ifndef _ASM_RISCV_PAGE_H 10 #define _ASM_RISCV_PAGE_H 11 12 #include <linux/pfn.h> 13 #include <linux/const.h> 14 15 #include <vdso/page.h> 16 17 #define HPAGE_SHIFT PMD_SHIFT 18 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 19 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 20 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 21 22 /* 23 * PAGE_OFFSET -- the first address of the first page of memory. 24 * When not using MMU this corresponds to the first free page in 25 * physical memory (aligned on a page boundary). 26 */ 27 #ifdef CONFIG_64BIT 28 #ifdef CONFIG_MMU 29 #define PAGE_OFFSET kernel_map.page_offset 30 #else 31 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL) 32 #endif 33 /* 34 * By default, CONFIG_PAGE_OFFSET value corresponds to SV57 address space so 35 * define the PAGE_OFFSET value for SV48 and SV39. 36 */ 37 #define PAGE_OFFSET_L4 _AC(0xffffaf8000000000, UL) 38 #define PAGE_OFFSET_L3 _AC(0xffffffd600000000, UL) 39 #else 40 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL) 41 #endif /* CONFIG_64BIT */ 42 43 #ifndef __ASSEMBLY__ 44 45 #ifdef CONFIG_RISCV_ISA_ZICBOZ 46 void clear_page(void *page); 47 #else 48 #define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 49 #endif 50 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 51 52 #define clear_user_page(pgaddr, vaddr, page) clear_page(pgaddr) 53 #define copy_user_page(vto, vfrom, vaddr, topg) \ 54 memcpy((vto), (vfrom), PAGE_SIZE) 55 56 /* 57 * Use struct definitions to apply C type checking 58 */ 59 60 /* Page Global Directory entry */ 61 typedef struct { 62 unsigned long pgd; 63 } pgd_t; 64 65 /* Page Table entry */ 66 typedef struct { 67 unsigned long pte; 68 } pte_t; 69 70 typedef struct { 71 unsigned long pgprot; 72 } pgprot_t; 73 74 typedef struct page *pgtable_t; 75 76 #define pte_val(x) ((x).pte) 77 #define pgd_val(x) ((x).pgd) 78 #define pgprot_val(x) ((x).pgprot) 79 80 #define __pte(x) ((pte_t) { (x) }) 81 #define __pgd(x) ((pgd_t) { (x) }) 82 #define __pgprot(x) ((pgprot_t) { (x) }) 83 84 #ifdef CONFIG_64BIT 85 #define PTE_FMT "%016lx" 86 #else 87 #define PTE_FMT "%08lx" 88 #endif 89 90 #if defined(CONFIG_64BIT) && defined(CONFIG_MMU) 91 /* 92 * We override this value as its generic definition uses __pa too early in 93 * the boot process (before kernel_map.va_pa_offset is set). 94 */ 95 #define MIN_MEMBLOCK_ADDR 0 96 #endif 97 98 #ifdef CONFIG_MMU 99 #define ARCH_PFN_OFFSET (PFN_DOWN((unsigned long)phys_ram_base)) 100 #else 101 #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 102 #endif /* CONFIG_MMU */ 103 104 struct kernel_mapping { 105 unsigned long page_offset; 106 unsigned long virt_addr; 107 unsigned long virt_offset; 108 uintptr_t phys_addr; 109 uintptr_t size; 110 /* Offset between linear mapping virtual address and kernel load address */ 111 unsigned long va_pa_offset; 112 /* Offset between kernel mapping virtual address and kernel load address */ 113 #ifdef CONFIG_XIP_KERNEL 114 unsigned long va_kernel_xip_text_pa_offset; 115 unsigned long va_kernel_xip_data_pa_offset; 116 uintptr_t xiprom; 117 uintptr_t xiprom_sz; 118 #else 119 unsigned long va_kernel_pa_offset; 120 #endif 121 }; 122 123 extern struct kernel_mapping kernel_map; 124 extern phys_addr_t phys_ram_base; 125 126 #define is_kernel_mapping(x) \ 127 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size)) 128 129 #define is_linear_mapping(x) \ 130 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE)) 131 132 #ifndef CONFIG_DEBUG_VIRTUAL 133 #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset)) 134 #else 135 void *linear_mapping_pa_to_va(unsigned long x); 136 #endif 137 138 #ifdef CONFIG_XIP_KERNEL 139 #define kernel_mapping_pa_to_va(y) ({ \ 140 unsigned long _y = (unsigned long)(y); \ 141 (_y < phys_ram_base) ? \ 142 (void *)(_y + kernel_map.va_kernel_xip_text_pa_offset) : \ 143 (void *)(_y + kernel_map.va_kernel_xip_data_pa_offset); \ 144 }) 145 #else 146 #define kernel_mapping_pa_to_va(y) ((void *)((unsigned long)(y) + kernel_map.va_kernel_pa_offset)) 147 #endif 148 149 #define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x) 150 151 #ifndef CONFIG_DEBUG_VIRTUAL 152 #define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset) 153 #else 154 phys_addr_t linear_mapping_va_to_pa(unsigned long x); 155 #endif 156 157 #ifdef CONFIG_XIP_KERNEL 158 #define kernel_mapping_va_to_pa(y) ({ \ 159 unsigned long _y = (unsigned long)(y); \ 160 (_y < kernel_map.virt_addr + kernel_map.xiprom_sz) ? \ 161 (_y - kernel_map.va_kernel_xip_text_pa_offset) : \ 162 (_y - kernel_map.va_kernel_xip_data_pa_offset); \ 163 }) 164 #else 165 #define kernel_mapping_va_to_pa(y) ((unsigned long)(y) - kernel_map.va_kernel_pa_offset) 166 #endif 167 168 #define __va_to_pa_nodebug(x) ({ \ 169 unsigned long _x = x; \ 170 is_linear_mapping(_x) ? \ 171 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \ 172 }) 173 174 #ifdef CONFIG_DEBUG_VIRTUAL 175 extern phys_addr_t __virt_to_phys(unsigned long x); 176 extern phys_addr_t __phys_addr_symbol(unsigned long x); 177 #else 178 #define __virt_to_phys(x) __va_to_pa_nodebug(x) 179 #define __phys_addr_symbol(x) __va_to_pa_nodebug(x) 180 #endif /* CONFIG_DEBUG_VIRTUAL */ 181 182 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 183 #define __pa(x) __virt_to_phys((unsigned long)(x)) 184 #define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x))) 185 186 #define phys_to_pfn(phys) (PFN_DOWN(phys)) 187 #define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 188 189 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr))) 190 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn))) 191 192 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 193 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 194 195 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 196 197 unsigned long kaslr_offset(void); 198 199 static __always_inline void *pfn_to_kaddr(unsigned long pfn) 200 { 201 return __va(pfn << PAGE_SHIFT); 202 } 203 204 #endif /* __ASSEMBLY__ */ 205 206 #define virt_addr_valid(vaddr) ({ \ 207 unsigned long _addr = (unsigned long)vaddr; \ 208 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \ 209 }) 210 211 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 212 213 #include <asm-generic/memory_model.h> 214 #include <asm-generic/getorder.h> 215 216 #endif /* _ASM_RISCV_PAGE_H */ 217