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