1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited 4 */ 5 6 #ifndef __ASM_HUGETLB_H 7 #define __ASM_HUGETLB_H 8 9 #include <asm/page.h> 10 11 uint64_t pmd_to_entrylo(unsigned long pmd_val); 12 13 #define __HAVE_ARCH_PREPARE_HUGEPAGE_RANGE 14 static inline int prepare_hugepage_range(struct file *file, 15 unsigned long addr, 16 unsigned long len) 17 { 18 unsigned long task_size = STACK_TOP; 19 struct hstate *h = hstate_file(file); 20 21 if (len & ~huge_page_mask(h)) 22 return -EINVAL; 23 if (addr & ~huge_page_mask(h)) 24 return -EINVAL; 25 if (len > task_size) 26 return -ENOMEM; 27 if (task_size - len < addr) 28 return -EINVAL; 29 return 0; 30 } 31 32 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR 33 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 34 unsigned long addr, pte_t *ptep) 35 { 36 pte_t clear; 37 pte_t pte = *ptep; 38 39 pte_val(clear) = (unsigned long)invalid_pte_table; 40 set_pte_at(mm, addr, ptep, clear); 41 return pte; 42 } 43 44 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH 45 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, 46 unsigned long addr, pte_t *ptep) 47 { 48 pte_t pte; 49 50 pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); 51 flush_tlb_page(vma, addr); 52 return pte; 53 } 54 55 #define __HAVE_ARCH_HUGE_PTE_NONE 56 static inline int huge_pte_none(pte_t pte) 57 { 58 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL; 59 return !val || (val == (unsigned long)invalid_pte_table); 60 } 61 62 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS 63 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 64 unsigned long addr, 65 pte_t *ptep, pte_t pte, 66 int dirty) 67 { 68 int changed = !pte_same(*ptep, pte); 69 70 if (changed) { 71 set_pte_at(vma->vm_mm, addr, ptep, pte); 72 /* 73 * There could be some standard sized pages in there, 74 * get them all. 75 */ 76 flush_tlb_range(vma, addr, addr + HPAGE_SIZE); 77 } 78 return changed; 79 } 80 81 #include <asm-generic/hugetlb.h> 82 83 #endif /* __ASM_HUGETLB_H */ 84