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_MMU 28 #ifdef CONFIG_64BIT 29 #define PAGE_OFFSET_L5 _AC(0xff60000000000000, UL) 30 #define PAGE_OFFSET_L4 _AC(0xffffaf8000000000, UL) 31 #define PAGE_OFFSET_L3 _AC(0xffffffd600000000, UL) 32 #ifdef CONFIG_XIP_KERNEL 33 #define PAGE_OFFSET PAGE_OFFSET_L3 34 #else 35 #define PAGE_OFFSET kernel_map.page_offset 36 #endif /* CONFIG_XIP_KERNEL */ 37 #else 38 #define PAGE_OFFSET _AC(0xc0000000, UL) 39 #endif /* CONFIG_64BIT */ 40 #else 41 #define PAGE_OFFSET ((unsigned long)phys_ram_base) 42 #endif /* CONFIG_MMU */ 43 44 #ifndef __ASSEMBLER__ 45 46 #ifdef CONFIG_RISCV_ISA_ZICBOZ 47 void clear_page(void *page); 48 #else 49 #define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 50 #endif 51 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 52 53 #define copy_user_page(vto, vfrom, vaddr, topg) copy_page(vto, vfrom) 54 55 /* 56 * Use struct definitions to apply C type checking 57 */ 58 59 /* Page Global Directory entry */ 60 typedef struct { 61 unsigned long pgd; 62 } pgd_t; 63 64 /* Page Table entry */ 65 typedef struct { 66 unsigned long pte; 67 } pte_t; 68 69 typedef struct { 70 unsigned long pgprot; 71 } pgprot_t; 72 73 typedef struct page *pgtable_t; 74 75 #define pte_val(x) ((x).pte) 76 #define pgd_val(x) ((x).pgd) 77 #define pgprot_val(x) ((x).pgprot) 78 79 #define __pte(x) ((pte_t) { (x) }) 80 #define __pgd(x) ((pgd_t) { (x) }) 81 #define __pgprot(x) ((pgprot_t) { (x) }) 82 83 #ifdef CONFIG_64BIT 84 #define PTE_FMT "%016lx" 85 #else 86 #define PTE_FMT "%08lx" 87 #endif 88 89 #if defined(CONFIG_64BIT) && defined(CONFIG_MMU) 90 /* 91 * We override this value as its generic definition uses __pa too early in 92 * the boot process (before kernel_map.va_pa_offset is set). 93 */ 94 #define MIN_MEMBLOCK_ADDR 0 95 #endif 96 97 #define ARCH_PFN_OFFSET (PFN_DOWN((unsigned long)phys_ram_base)) 98 99 struct kernel_mapping { 100 unsigned long virt_addr; 101 unsigned long virt_offset; 102 uintptr_t phys_addr; 103 uintptr_t size; 104 /* Offset between linear mapping virtual address and kernel load address */ 105 unsigned long va_pa_offset; 106 /* Offset between kernel mapping virtual address and kernel load address */ 107 #ifdef CONFIG_XIP_KERNEL 108 unsigned long va_kernel_xip_text_pa_offset; 109 unsigned long va_kernel_xip_data_pa_offset; 110 uintptr_t xiprom; 111 uintptr_t xiprom_sz; 112 #else 113 unsigned long page_offset; 114 unsigned long va_kernel_pa_offset; 115 #endif 116 }; 117 118 extern struct kernel_mapping kernel_map; 119 extern phys_addr_t phys_ram_base; 120 extern unsigned long vmemmap_start_pfn; 121 122 #define is_kernel_mapping(x) \ 123 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size)) 124 125 #define is_linear_mapping(x) \ 126 ((x) >= PAGE_OFFSET && (!IS_ENABLED(CONFIG_64BIT) || (x) < PAGE_OFFSET + KERN_VIRT_SIZE)) 127 128 #ifndef CONFIG_DEBUG_VIRTUAL 129 #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset)) 130 #else 131 void *linear_mapping_pa_to_va(unsigned long x); 132 #endif 133 134 #ifdef CONFIG_XIP_KERNEL 135 #define kernel_mapping_pa_to_va(y) ({ \ 136 unsigned long _y = (unsigned long)(y); \ 137 (_y < phys_ram_base) ? \ 138 (void *)(_y + kernel_map.va_kernel_xip_text_pa_offset) : \ 139 (void *)(_y + kernel_map.va_kernel_xip_data_pa_offset); \ 140 }) 141 #else 142 #define kernel_mapping_pa_to_va(y) ((void *)((unsigned long)(y) + kernel_map.va_kernel_pa_offset)) 143 #endif 144 145 #define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x) 146 147 #ifndef CONFIG_DEBUG_VIRTUAL 148 #define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset) 149 #else 150 phys_addr_t linear_mapping_va_to_pa(unsigned long x); 151 #endif 152 153 #ifdef CONFIG_XIP_KERNEL 154 #define kernel_mapping_va_to_pa(y) ({ \ 155 unsigned long _y = (unsigned long)(y); \ 156 (_y < kernel_map.virt_addr + kernel_map.xiprom_sz) ? \ 157 (_y - kernel_map.va_kernel_xip_text_pa_offset) : \ 158 (_y - kernel_map.va_kernel_xip_data_pa_offset); \ 159 }) 160 #else 161 #define kernel_mapping_va_to_pa(y) ((unsigned long)(y) - kernel_map.va_kernel_pa_offset) 162 #endif 163 164 #define __va_to_pa_nodebug(x) ({ \ 165 unsigned long _x = x; \ 166 is_linear_mapping(_x) ? \ 167 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \ 168 }) 169 170 #ifdef CONFIG_DEBUG_VIRTUAL 171 extern phys_addr_t __virt_to_phys(unsigned long x); 172 extern phys_addr_t __phys_addr_symbol(unsigned long x); 173 #else 174 #define __virt_to_phys(x) __va_to_pa_nodebug(x) 175 #define __phys_addr_symbol(x) __va_to_pa_nodebug(x) 176 #endif /* CONFIG_DEBUG_VIRTUAL */ 177 178 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 179 #define __pa(x) __virt_to_phys((unsigned long)(x)) 180 #define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x))) 181 182 #define phys_to_pfn(phys) (PFN_DOWN(phys)) 183 #define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 184 185 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr))) 186 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn))) 187 188 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 189 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 190 191 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 192 193 unsigned long kaslr_offset(void); 194 195 static __always_inline void *pfn_to_kaddr(unsigned long pfn) 196 { 197 return __va(pfn << PAGE_SHIFT); 198 } 199 200 #endif /* __ASSEMBLER__ */ 201 202 #define virt_addr_valid(vaddr) ({ \ 203 unsigned long _addr = (unsigned long)vaddr; \ 204 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \ 205 }) 206 207 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 208 209 #include <asm-generic/memory_model.h> 210 #include <asm-generic/getorder.h> 211 212 #endif /* _ASM_RISCV_PAGE_H */ 213