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 10 /* 11 * PAGE_SHIFT determines the page size 12 */ 13 #ifdef CONFIG_PAGE_SIZE_4KB 14 #define PAGE_SHIFT 12 15 #endif 16 #ifdef CONFIG_PAGE_SIZE_16KB 17 #define PAGE_SHIFT 14 18 #endif 19 #ifdef CONFIG_PAGE_SIZE_64KB 20 #define PAGE_SHIFT 16 21 #endif 22 #define PAGE_SIZE (_AC(1, UL) << PAGE_SHIFT) 23 #define PAGE_MASK (~(PAGE_SIZE - 1)) 24 25 #define HPAGE_SHIFT (PAGE_SHIFT + PAGE_SHIFT - 3) 26 #define HPAGE_SIZE (_AC(1, UL) << HPAGE_SHIFT) 27 #define HPAGE_MASK (~(HPAGE_SIZE - 1)) 28 #define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT) 29 30 #ifndef __ASSEMBLY__ 31 32 #include <linux/kernel.h> 33 #include <linux/pfn.h> 34 35 #define MAX_DMA32_PFN (1UL << (32 - PAGE_SHIFT)) 36 37 /* 38 * It's normally defined only for FLATMEM config but it's 39 * used in our early mem init code for all memory models. 40 * So always define it. 41 */ 42 #define ARCH_PFN_OFFSET PFN_UP(PHYS_OFFSET) 43 44 extern void clear_page(void *page); 45 extern void copy_page(void *to, void *from); 46 47 #define clear_user_page(page, vaddr, pg) clear_page(page) 48 #define copy_user_page(to, from, vaddr, pg) copy_page(to, from) 49 50 extern unsigned long shm_align_mask; 51 52 struct page; 53 struct vm_area_struct; 54 void copy_user_highpage(struct page *to, struct page *from, 55 unsigned long vaddr, struct vm_area_struct *vma); 56 57 #define __HAVE_ARCH_COPY_USER_HIGHPAGE 58 59 typedef struct { unsigned long pte; } pte_t; 60 #define pte_val(x) ((x).pte) 61 #define __pte(x) ((pte_t) { (x) }) 62 typedef struct page *pgtable_t; 63 64 typedef struct { unsigned long pgd; } pgd_t; 65 #define pgd_val(x) ((x).pgd) 66 #define __pgd(x) ((pgd_t) { (x) }) 67 68 /* 69 * Manipulate page protection bits 70 */ 71 typedef struct { unsigned long pgprot; } pgprot_t; 72 #define pgprot_val(x) ((x).pgprot) 73 #define __pgprot(x) ((pgprot_t) { (x) }) 74 #define pte_pgprot(x) __pgprot(pte_val(x) & ~_PFN_MASK) 75 76 #define ptep_buddy(x) ((pte_t *)((unsigned long)(x) ^ sizeof(pte_t))) 77 78 /* 79 * __pa()/__va() should be used only during mem init. 80 */ 81 #define __pa(x) PHYSADDR(x) 82 #define __va(x) ((void *)((unsigned long)(x) + PAGE_OFFSET - PHYS_OFFSET)) 83 84 #define pfn_to_kaddr(pfn) __va((pfn) << PAGE_SHIFT) 85 86 #ifdef CONFIG_FLATMEM 87 88 static inline int pfn_valid(unsigned long pfn) 89 { 90 /* avoid <linux/mm.h> include hell */ 91 extern unsigned long max_mapnr; 92 unsigned long pfn_offset = ARCH_PFN_OFFSET; 93 94 return pfn >= pfn_offset && pfn < max_mapnr; 95 } 96 97 #endif 98 99 #define virt_to_pfn(kaddr) PFN_DOWN(virt_to_phys((void *)(kaddr))) 100 #define virt_to_page(kaddr) pfn_to_page(virt_to_pfn(kaddr)) 101 102 extern int __virt_addr_valid(volatile void *kaddr); 103 #define virt_addr_valid(kaddr) __virt_addr_valid((volatile void *)(kaddr)) 104 105 #define VM_DATA_DEFAULT_FLAGS \ 106 (VM_READ | VM_WRITE | \ 107 ((current->personality & READ_IMPLIES_EXEC) ? VM_EXEC : 0) | \ 108 VM_MAYREAD | VM_MAYWRITE | VM_MAYEXEC) 109 110 #include <asm-generic/memory_model.h> 111 #include <asm-generic/getorder.h> 112 113 #endif /* !__ASSEMBLY__ */ 114 115 #endif /* _ASM_PAGE_H */ 116