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 /* 20 * PAGE_OFFSET -- the first address of the first page of memory. 21 * When not using MMU this corresponds to the first free page in 22 * physical memory (aligned on a page boundary). 23 */ 24 #define PAGE_OFFSET _AC(CONFIG_PAGE_OFFSET, UL) 25 26 #define KERN_VIRT_SIZE (-PAGE_OFFSET) 27 28 #ifndef __ASSEMBLY__ 29 30 #define PAGE_UP(addr) (((addr)+((PAGE_SIZE)-1))&(~((PAGE_SIZE)-1))) 31 #define PAGE_DOWN(addr) ((addr)&(~((PAGE_SIZE)-1))) 32 33 /* align addr on a size boundary - adjust address up/down if needed */ 34 #define _ALIGN_UP(addr, size) (((addr)+((size)-1))&(~((size)-1))) 35 #define _ALIGN_DOWN(addr, size) ((addr)&(~((size)-1))) 36 37 /* align addr on a size boundary - adjust address up if needed */ 38 #define _ALIGN(addr, size) _ALIGN_UP(addr, size) 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 extern unsigned long va_pa_offset; 82 extern unsigned long pfn_base; 83 84 extern unsigned long max_low_pfn; 85 extern unsigned long min_low_pfn; 86 87 #define __pa(x) ((unsigned long)(x) - va_pa_offset) 88 #define __va(x) ((void *)((unsigned long) (x) + va_pa_offset)) 89 90 #define phys_to_pfn(phys) (PFN_DOWN(phys)) 91 #define pfn_to_phys(pfn) (PFN_PHYS(pfn)) 92 93 #define virt_to_pfn(vaddr) (phys_to_pfn(__pa(vaddr))) 94 #define pfn_to_virt(pfn) (__va(pfn_to_phys(pfn))) 95 96 #define virt_to_page(vaddr) (pfn_to_page(virt_to_pfn(vaddr))) 97 #define page_to_virt(page) (pfn_to_virt(page_to_pfn(page))) 98 99 #define page_to_phys(page) (pfn_to_phys(page_to_pfn(page))) 100 #define page_to_bus(page) (page_to_phys(page)) 101 #define phys_to_page(paddr) (pfn_to_page(phys_to_pfn(paddr))) 102 103 #define pfn_valid(pfn) \ 104 (((pfn) >= pfn_base) && (((pfn)-pfn_base) < max_mapnr)) 105 106 #define ARCH_PFN_OFFSET (pfn_base) 107 108 #endif /* __ASSEMBLY__ */ 109 110 #define virt_addr_valid(vaddr) (pfn_valid(virt_to_pfn(vaddr))) 111 112 #define VM_DATA_DEFAULT_FLAGS (VM_READ | VM_WRITE | \ 113 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 114 115 #include <asm-generic/memory_model.h> 116 #include <asm-generic/getorder.h> 117 118 /* vDSO support */ 119 /* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */ 120 #define __HAVE_ARCH_GATE_AREA 121 122 #endif /* _ASM_RISCV_PAGE_H */ 123