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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2020-2022 Loongson Technology Corporation Limited
*/
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <linux/pagemap.h>
#include <linux/err.h>
#include <linux/sysctl.h>
#include <asm/mman.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
unsigned long addr, unsigned long sz)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pte_t *pte = NULL;
pgd = pgd_offset(mm, addr);
p4d = p4d_alloc(mm, pgd, addr);
pud = pud_alloc(mm, p4d, addr);
if (pud)
pte = (pte_t *)pmd_alloc(mm, pud, addr);
return pte;
}
pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr,
unsigned long sz)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd = NULL;
pgd = pgd_offset(mm, addr);
if (pgd_present(*pgd)) {
p4d = p4d_offset(pgd, addr);
if (p4d_present(*p4d)) {
pud = pud_offset(p4d, addr);
if (pud_present(*pud))
pmd = pmd_offset(pud, addr);
}
}
return (pte_t *) pmd;
}
int pmd_huge(pmd_t pmd)
{
return (pmd_val(pmd) & _PAGE_HUGE) != 0;
}
int pud_huge(pud_t pud)
{
return (pud_val(pud) & _PAGE_HUGE) != 0;
}
uint64_t pmd_to_entrylo(unsigned long pmd_val)
{
uint64_t val;
/* PMD as PTE. Must be huge page */
if (!pmd_huge(__pmd(pmd_val)))
panic("%s", __func__);
val = pmd_val ^ _PAGE_HUGE;
val |= ((val & _PAGE_HGLOBAL) >>
(_PAGE_HGLOBAL_SHIFT - _PAGE_GLOBAL_SHIFT));
return val;
}
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