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 35extern void clear_page(void *page); 36extern 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 41extern unsigned long shm_align_mask; 42 43struct page; 44struct vm_area_struct; 45void 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 50typedef struct { unsigned long pte; } pte_t; 51#define pte_val(x) ((x).pte) 52#define __pte(x) ((pte_t) { (x) }) 53typedef struct page *pgtable_t; 54 55typedef 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 */ 62typedef 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 78struct page *dmw_virt_to_page(unsigned long kaddr); 79struct 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 113extern 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