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 #define PAGE_SHIFT (12) 16 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 17 #define PAGE_MASK (~(PAGE_SIZE - 1)) 18 19 #ifdef CONFIG_64BIT 20 #define HUGE_MAX_HSTATE 2 21 #else 22 #define HUGE_MAX_HSTATE 1 23 #endif 24 #define HPAGE_SHIFT PMD_SHIFT 25 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 26 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 27 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 28 29 /* 30 * PAGE_OFFSET -- the first address of the first page of memory. 31 * When not using MMU this corresponds to the first free page in 32 * physical memory (aligned on a page boundary). 33 */ 34 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL) 35 36 #define KERN_VIRT_SIZE (-PAGE_OFFSET) 37 38 #ifndef __ASSEMBLY__ 39 40 #define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 41 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 42 43 #define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 44 #define copy_user_page(vto, vfrom, vaddr, topg) \ 45 memcpy((vto), (vfrom), PAGE_SIZE) 46 47 /* 48 * Use struct definitions to apply C type checking 49 */ 50 51 /* Page Global Directory entry */ 52 typedef struct { 53 unsigned long pgd; 54 } pgd_t; 55 56 /* Page Table entry */ 57 typedef struct { 58 unsigned long pte; 59 } pte_t; 60 61 typedef struct { 62 unsigned long pgprot; 63 } pgprot_t; 64 65 typedef struct page *pgtable_t; 66 67 #define pte_val(x) ((x).pte) 68 #define pgd_val(x) ((x).pgd) 69 #define pgprot_val(x) ((x).pgprot) 70 71 #define __pte(x) ((pte_t) { (x) }) 72 #define __pgd(x) ((pgd_t) { (x) }) 73 #define __pgprot(x) ((pgprot_t) { (x) }) 74 75 #ifdef CONFIG_64BIT 76 #define PTE_FMT "%016lx" 77 #else 78 #define PTE_FMT "%08lx" 79 #endif 80 81 #ifdef CONFIG_MMU 82 extern unsigned long pfn_base; 83 #define ARCH_PFN_OFFSET (pfn_base) 84 #else 85 #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 86 #endif /* CONFIG_MMU */ 87 88 struct kernel_mapping { 89 unsigned long virt_addr; 90 uintptr_t phys_addr; 91 uintptr_t size; 92 /* Offset between linear mapping virtual address and kernel load address */ 93 unsigned long va_pa_offset; 94 #ifdef CONFIG_64BIT 95 /* Offset between kernel mapping virtual address and kernel load address */ 96 unsigned long va_kernel_pa_offset; 97 #endif 98 unsigned long va_kernel_xip_pa_offset; 99 #ifdef CONFIG_XIP_KERNEL 100 uintptr_t xiprom; 101 uintptr_t xiprom_sz; 102 #endif 103 }; 104 105 extern struct kernel_mapping kernel_map; 106 107 #ifdef CONFIG_64BIT 108 #define is_kernel_mapping(x) \ 109 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size)) 110 #define is_linear_mapping(x) \ 111 ((x) >= PAGE_OFFSET && (x) < kernel_map.virt_addr) 112 113 #define linear_mapping_pa_to_va(x) ((void *)((unsigned long)(x) + kernel_map.va_pa_offset)) 114 #define kernel_mapping_pa_to_va(y) ({ \ 115 unsigned long _y = y; \ 116 (_y >= CONFIG_PHYS_RAM_BASE) ? \ 117 (void *)((unsigned long)(_y) + kernel_map.va_kernel_pa_offset + XIP_OFFSET) : \ 118 (void *)((unsigned long)(_y) + kernel_map.va_kernel_xip_pa_offset); \ 119 }) 120 #define __pa_to_va_nodebug(x) linear_mapping_pa_to_va(x) 121 122 #define linear_mapping_va_to_pa(x) ((unsigned long)(x) - kernel_map.va_pa_offset) 123 #define kernel_mapping_va_to_pa(y) ({ \ 124 unsigned long _y = y; \ 125 (_y < kernel_map.virt_addr + XIP_OFFSET) ? \ 126 ((unsigned long)(_y) - kernel_map.va_kernel_xip_pa_offset) : \ 127 ((unsigned long)(_y) - kernel_map.va_kernel_pa_offset - XIP_OFFSET); \ 128 }) 129 130 #define __va_to_pa_nodebug(x) ({ \ 131 unsigned long _x = x; \ 132 is_linear_mapping(_x) ? \ 133 linear_mapping_va_to_pa(_x) : kernel_mapping_va_to_pa(_x); \ 134 }) 135 #else 136 #define is_kernel_mapping(x) \ 137 ((x) >= kernel_map.virt_addr && (x) < (kernel_map.virt_addr + kernel_map.size)) 138 #define is_linear_mapping(x) \ 139 ((x) >= PAGE_OFFSET) 140 141 #define __pa_to_va_nodebug(x) ((void *)((unsigned long) (x) + kernel_map.va_pa_offset)) 142 #define __va_to_pa_nodebug(x) ((unsigned long)(x) - kernel_map.va_pa_offset) 143 #endif /* CONFIG_64BIT */ 144 145 #ifdef CONFIG_DEBUG_VIRTUAL 146 extern phys_addr_t __virt_to_phys(unsigned long x); 147 extern phys_addr_t __phys_addr_symbol(unsigned long x); 148 #else 149 #define __virt_to_phys(x) __va_to_pa_nodebug(x) 150 #define __phys_addr_symbol(x) __va_to_pa_nodebug(x) 151 #endif /* CONFIG_DEBUG_VIRTUAL */ 152 153 #define __pa_symbol(x) __phys_addr_symbol(RELOC_HIDE((unsigned long)(x), 0)) 154 #define __pa(x) __virt_to_phys((unsigned long)(x)) 155 #define __va(x) ((void *)__pa_to_va_nodebug((phys_addr_t)(x))) 156 157 #define phys_to_pfn(phys) (PFN_DOWN(phys)) 158 #define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 159 160 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr))) 161 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn))) 162 163 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 164 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 165 166 #define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 167 #define page_to_bus(page) (page_to_phys(page)) 168 #define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 169 170 #ifdef CONFIG_FLATMEM 171 #define pfn_valid(pfn) \ 172 (((pfn) >= ARCH_PFN_OFFSET) && (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)) 173 #endif 174 175 #endif /* __ASSEMBLY__ */ 176 177 #define virt_addr_valid(vaddr) ({ \ 178 unsigned long _addr = (unsigned long)vaddr; \ 179 (unsigned long)(_addr) >= PAGE_OFFSET && pfn_valid(virt_to_pfn(_addr)); \ 180 }) 181 182 #define VM_DATA_DEFAULT_FLAGS VM_DATA_FLAGS_NON_EXEC 183 184 #include <asm-generic/memory_model.h> 185 #include <asm-generic/getorder.h> 186 187 #endif /* _ASM_RISCV_PAGE_H */ 188