1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
4 */
5
6 #include <linux/fs.h>
7 #include <linux/mm.h>
8 #include <linux/hugetlb.h>
9 #include <linux/pagemap.h>
10 #include <linux/err.h>
11 #include <linux/sysctl.h>
12 #include <asm/mman.h>
13 #include <asm/tlb.h>
14 #include <asm/tlbflush.h>
15
16 pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
17 unsigned long addr, unsigned long sz)
18 {
19 pgd_t *pgd;
20 p4d_t *p4d;
21 pud_t *pud;
22 pte_t *pte = NULL;
23
24 pgd = pgd_offset(mm, addr);
25 p4d = p4d_alloc(mm, pgd, addr);
26 pud = pud_alloc(mm, p4d, addr);
27 if (pud)
28 pte = (pte_t *)pmd_alloc(mm, pud, addr);
29
30 return pte;
31 }
32
33 pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
34 unsigned long sz)
35 {
36 pgd_t *pgd;
37 p4d_t *p4d;
38 pud_t *pud;
39 pmd_t *pmd = NULL;
40
41 pgd = pgd_offset(mm, addr);
42 if (pgd_present(pgdp_get(pgd))) {
43 p4d = p4d_offset(pgd, addr);
44 if (p4d_present(p4dp_get(p4d))) {
45 pud = pud_offset(p4d, addr);
46 if (pud_present(pudp_get(pud)))
47 pmd = pmd_offset(pud, addr);
48 }
49 }
50 return (pte_t *) pmd;
51 }
52
53 uint64_t pmd_to_entrylo(unsigned long pmd_val)
54 {
55 uint64_t val;
56 /* PMD as PTE. Must be huge page */
57 if (!pmd_leaf(__pmd(pmd_val)))
58 panic("%s", __func__);
59
60 val = pmd_val ^ _PAGE_HUGE;
61 val |= ((val & _PAGE_HGLOBAL) >>
62 (_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
63
64 return val;
65 }
66
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