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 20 if (len > task_size) 21 return -ENOMEM; 22 if (task_size - len < addr) 23 return -EINVAL; 24 return 0; 25 } 26 27 #define __HAVE_ARCH_HUGE_PTEP_GET_AND_CLEAR 28 static inline pte_t huge_ptep_get_and_clear(struct mm_struct *mm, 29 unsigned long addr, pte_t *ptep) 30 { 31 pte_t clear; 32 pte_t pte = ptep_get(ptep); 33 34 pte_val(clear) = (unsigned long)invalid_pte_table; 35 set_pte_at(mm, addr, ptep, clear); 36 return pte; 37 } 38 39 #define __HAVE_ARCH_HUGE_PTEP_CLEAR_FLUSH 40 static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, 41 unsigned long addr, pte_t *ptep) 42 { 43 pte_t pte; 44 45 pte = huge_ptep_get_and_clear(vma->vm_mm, addr, ptep); 46 flush_tlb_page(vma, addr); 47 return pte; 48 } 49 50 #define __HAVE_ARCH_HUGE_PTE_NONE 51 static inline int huge_pte_none(pte_t pte) 52 { 53 unsigned long val = pte_val(pte) & ~_PAGE_GLOBAL; 54 return !val || (val == (unsigned long)invalid_pte_table); 55 } 56 57 #define __HAVE_ARCH_HUGE_PTEP_SET_ACCESS_FLAGS 58 static inline int huge_ptep_set_access_flags(struct vm_area_struct *vma, 59 unsigned long addr, 60 pte_t *ptep, pte_t pte, 61 int dirty) 62 { 63 int changed = !pte_same(ptep_get(ptep), pte); 64 65 if (changed) { 66 set_pte_at(vma->vm_mm, addr, ptep, pte); 67 /* 68 * There could be some standard sized pages in there, 69 * get them all. 70 */ 71 flush_tlb_range(vma, addr, addr + HPAGE_SIZE); 72 } 73 return changed; 74 } 75 76 #include <asm-generic/hugetlb.h> 77 78 #endif /* __ASM_HUGETLB_H */ 79