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