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 PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1))) 41 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1))) 42 43 /* align addr on a size boundary - adjust address up/down if needed */ 44 #define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1))) 45 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1))) 46 47 /* align addr on a size boundary - adjust address up if needed */ 48 #define _ALIGN(addr, size) _ALIGN_UP(addr, size) 49 50 #define clear_page(pgaddr) memset((pgaddr), 0, PAGE_SIZE) 51 #define copy_page(to, from) memcpy((to), (from), PAGE_SIZE) 52 53 #define clear_user_page(pgaddr, vaddr, page) memset((pgaddr), 0, PAGE_SIZE) 54 #define copy_user_page(vto, vfrom, vaddr, topg) \ 55 memcpy((vto), (vfrom), PAGE_SIZE) 56 57 /* 58 * Use struct definitions to apply C type checking 59 */ 60 61 /* Page Global Directory entry */ 62 typedef struct { 63 unsigned long pgd; 64 } pgd_t; 65 66 /* Page Table entry */ 67 typedef struct { 68 unsigned long pte; 69 } pte_t; 70 71 typedef struct { 72 unsigned long pgprot; 73 } pgprot_t; 74 75 typedef struct page *pgtable_t; 76 77 #define pte_val(x) ((x).pte) 78 #define pgd_val(x) ((x).pgd) 79 #define pgprot_val(x) ((x).pgprot) 80 81 #define __pte(x) ((pte_t) { (x) }) 82 #define __pgd(x) ((pgd_t) { (x) }) 83 #define __pgprot(x) ((pgprot_t) { (x) }) 84 85 #ifdef CONFIG_64BIT 86 #define PTE_FMT "%016lx" 87 #else 88 #define PTE_FMT "%08lx" 89 #endif 90 91 #ifdef CONFIG_MMU 92 extern unsigned long va_pa_offset; 93 extern unsigned long pfn_base; 94 #define ARCH_PFN_OFFSET (pfn_base) 95 #else 96 #define va_pa_offset 0 97 #define ARCH_PFN_OFFSET (PAGE_OFFSET >> PAGE_SHIFT) 98 #endif /* CONFIG_MMU */ 99 100 extern unsigned long max_low_pfn; 101 extern unsigned long min_low_pfn; 102 103 #define __pa(x) ((unsigned long)(x) - va_pa_offset) 104 #define __va(x) ((void *)((unsigned long) (x) + va_pa_offset)) 105 106 #define phys_to_pfn(phys) (PFN_DOWN(phys)) 107 #define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 108 109 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr))) 110 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn))) 111 112 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 113 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 114 115 #define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 116 #define page_to_bus(page) (page_to_phys(page)) 117 #define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 118 119 #ifdef CONFIG_FLATMEM 120 #define pfn_valid(pfn) \ 121 (((pfn) >= ARCH_PFN_OFFSET) && (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)) 122 #endif 123 124 #endif /* __ASSEMBLY__ */ 125 126 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 127 128 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 129 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 130 131 #include <asm-generic/memory_model.h> 132 #include <asm-generic/getorder.h> 133 134 #endif /* _ASM_RISCV_PAGE_H */ 135