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 #ifdef CONFIG_PAGE_SIZE_4KB 15 #define PAGE_SHIFT 12 16 #endif 17 #ifdef CONFIG_PAGE_SIZE_16KB 18 #define PAGE_SHIFT 14 19 #endif 20 #ifdef CONFIG_PAGE_SIZE_64KB 21 #define PAGE_SHIFT 16 22 #endif 23 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 24 #define PAGE_MASK (~(PAGE_SIZE - 1)) 25 26 #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) 27 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 28 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 29 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 30 31 #ifndef __ASSEMBLY__ 32 33 #include <linux/kernel.h> 34 #include <linux/pfn.h> 35 36 #define MAX_DMA32_PFN (1UL << (32 - PAGE_SHIFT)) 37 38 /* 39 * It's normally defined only for FLATMEM config but it's 40 * used in our early mem init code for all memory models. 41 * So always define it. 42 */ 43 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 44 45 extern void clear_page(void *page); 46 extern void copy_page(void *to, void *from); 47 48 #define clear_user_page(page, vaddr, pg) clear_page(page) 49 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 50 51 extern unsigned long shm_align_mask; 52 53 struct page; 54 struct vm_area_struct; 55 void copy_user_highpage(struct page *to, struct page *from, 56 unsigned long vaddr, struct vm_area_struct *vma); 57 58 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 59 60 typedef struct { unsigned long pte; } pte_t; 61 #define pte_val(x) ((x).pte) 62 #define __pte(x) ((pte_t) { (x) }) 63 typedef struct page *pgtable_t; 64 65 typedef struct { unsigned long pgd; } pgd_t; 66 #define pgd_val(x) ((x).pgd) 67 #define __pgd(x) ((pgd_t) { (x) }) 68 69 /* 70 * Manipulate page protection bits 71 */ 72 typedef struct { unsigned long pgprot; } pgprot_t; 73 #define pgprot_val(x) ((x).pgprot) 74 #define __pgprot(x) ((pgprot_t) { (x) }) 75 #define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK) 76 77 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 78 79 /* 80 * __pa()/__va() should be used only during mem init. 81 */ 82 #define __pa(x) PHYSADDR(x) 83 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 84 85 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 86 87 #ifdef CONFIG_FLATMEM 88 89 static inline int pfn_valid(unsigned long pfn) 90 { 91 /* avoid <linux/mm.h> include hell */ 92 extern unsigned long max_mapnr; 93 unsigned long pfn_offset = ARCH_PFN_OFFSET; 94 95 return pfn >= pfn_offset && pfn < max_mapnr; 96 } 97 98 #endif 99 100 #define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr))) 101 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 102 103 extern int __virt_addr_valid(volatile void *kaddr); 104 #define virt_addr_valid(kaddr) __virt_addr_valid((volatile void *)(kaddr)) 105 106 #define VM_DATA_DEFAULT_FLAGS \ 107 (VM_READ | VM_WRITE | \ 108 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ 109 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 110 111 #include <asm-generic/memory_model.h> 112 #include <asm-generic/getorder.h> 113 114 #endif /* !__ASSEMBLY__ */ 115 116 #endif /* _ASM_PAGE_H */ 117