1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 #ifndef _ASM_PAGE_H 6 #define _ASM_PAGE_H 7 8 #include <linux/const.h> 9 #include <asm/addrspace.h> 10 11 /* 12 * PAGE_SHIFT determines the page size 13 */ 14 #define PAGE_SHIFT CONFIG_PAGE_SHIFT 15 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 16 #define PAGE_MASK (~(PAGE_SIZE - 1)) 17 18 #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) 19 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 20 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 21 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 22 23 #ifndef __ASSEMBLY__ 24 25 #include <linux/kernel.h> 26 #include <linux/pfn.h> 27 28 /* 29 * It's normally defined only for FLATMEM config but it's 30 * used in our early mem init code for all memory models. 31 * So always define it. 32 */ 33 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 34 35 extern void clear_page(void *page); 36 extern void copy_page(void *to, void *from); 37 38 #define clear_user_page(page, vaddr, pg) clear_page(page) 39 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 40 41 extern unsigned long shm_align_mask; 42 43 struct page; 44 struct vm_area_struct; 45 void copy_user_highpage(struct page *to, struct page *from, 46 unsigned long vaddr, struct vm_area_struct *vma); 47 48 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 49 50 typedef struct { unsigned long pte; } pte_t; 51 #define pte_val(x) ((x).pte) 52 #define __pte(x) ((pte_t) { (x) }) 53 typedef struct page *pgtable_t; 54 55 typedef struct { unsigned long pgd; } pgd_t; 56 #define pgd_val(x) ((x).pgd) 57 #define __pgd(x) ((pgd_t) { (x) }) 58 59 /* 60 * Manipulate page protection bits 61 */ 62 typedef struct { unsigned long pgprot; } pgprot_t; 63 #define pgprot_val(x) ((x).pgprot) 64 #define __pgprot(x) ((pgprot_t) { (x) }) 65 #define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK) 66 67 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 68 69 /* 70 * __pa()/__va() should be used only during mem init. 71 */ 72 #define __pa(x) PHYSADDR(x) 73 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 74 75 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 76 #define sym_to_pfn(x) __phys_to_pfn(__pa_symbol(x)) 77 78 struct page *dmw_virt_to_page(unsigned long kaddr); 79 struct page *tlb_virt_to_page(unsigned long kaddr); 80 81 #define pfn_to_phys(pfn) __pfn_to_phys(pfn) 82 #define phys_to_pfn(paddr) __phys_to_pfn(paddr) 83 84 #define page_to_phys(page) pfn_to_phys(page_to_pfn(page)) 85 #define phys_to_page(paddr) pfn_to_page(phys_to_pfn(paddr)) 86 87 #ifndef CONFIG_KFENCE 88 89 #define page_to_virt(page) __va(page_to_phys(page)) 90 #define virt_to_page(kaddr) phys_to_page(__pa(kaddr)) 91 92 #else 93 94 #define WANT_PAGE_VIRTUAL 95 96 #define page_to_virt(page) \ 97 ({ \ 98 extern char *__kfence_pool; \ 99 (__kfence_pool == NULL) ? __va(page_to_phys(page)) : page_address(page); \ 100 }) 101 102 #define virt_to_page(kaddr) \ 103 ({ \ 104 (likely((unsigned long)kaddr < vm_map_base)) ? \ 105 dmw_virt_to_page((unsigned long)kaddr) : tlb_virt_to_page((unsigned long)kaddr);\ 106 }) 107 108 #endif 109 110 #define pfn_to_virt(pfn) page_to_virt(pfn_to_page(pfn)) 111 #define virt_to_pfn(kaddr) page_to_pfn(virt_to_page(kaddr)) 112 113 extern int __virt_addr_valid(volatile void *kaddr); 114 #define virt_addr_valid(kaddr) __virt_addr_valid((volatile void *)(kaddr)) 115 116 #define VM_DATA_DEFAULT_FLAGS \ 117 (VM_READ | VM_WRITE | \ 118 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ 119 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 120 121 #include <asm-generic/memory_model.h> 122 #include <asm-generic/getorder.h> 123 124 #endif /* !__ASSEMBLY__ */ 125 126 #endif /* _ASM_PAGE_H */ 127