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Current File : /proc/self/root/lib/modules/5.4.0-163-generic/build/arch/riscv/include/asm/pgalloc.h
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2009 Chen Liqin <liqin.chen@sunplusct.com>
 * Copyright (C) 2012 Regents of the University of California
 */

#ifndef _ASM_RISCV_PGALLOC_H
#define _ASM_RISCV_PGALLOC_H

#include <linux/mm.h>
#include <asm/tlb.h>

#include <asm-generic/pgalloc.h>	/* for pte_{alloc,free}_one */

static inline void pmd_populate_kernel(struct mm_struct *mm,
	pmd_t *pmd, pte_t *pte)
{
	unsigned long pfn = virt_to_pfn(pte);

	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}

static inline void pmd_populate(struct mm_struct *mm,
	pmd_t *pmd, pgtable_t pte)
{
	unsigned long pfn = virt_to_pfn(page_address(pte));

	set_pmd(pmd, __pmd((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}

#ifndef __PAGETABLE_PMD_FOLDED
static inline void pud_populate(struct mm_struct *mm, pud_t *pud, pmd_t *pmd)
{
	unsigned long pfn = virt_to_pfn(pmd);

	set_pud(pud, __pud((pfn << _PAGE_PFN_SHIFT) | _PAGE_TABLE));
}
#endif /* __PAGETABLE_PMD_FOLDED */

#define pmd_pgtable(pmd)	pmd_page(pmd)

static inline pgd_t *pgd_alloc(struct mm_struct *mm)
{
	pgd_t *pgd;

	pgd = (pgd_t *)__get_free_page(GFP_KERNEL);
	if (likely(pgd != NULL)) {
		memset(pgd, 0, USER_PTRS_PER_PGD * sizeof(pgd_t));
		/* Copy kernel mappings */
		memcpy(pgd + USER_PTRS_PER_PGD,
			init_mm.pgd + USER_PTRS_PER_PGD,
			(PTRS_PER_PGD - USER_PTRS_PER_PGD) * sizeof(pgd_t));
	}
	return pgd;
}

static inline void pgd_free(struct mm_struct *mm, pgd_t *pgd)
{
	free_page((unsigned long)pgd);
}

#ifndef __PAGETABLE_PMD_FOLDED

static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	return (pmd_t *)__get_free_page(
		GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_ZERO);
}

static inline void pmd_free(struct mm_struct *mm, pmd_t *pmd)
{
	free_page((unsigned long)pmd);
}

#define __pmd_free_tlb(tlb, pmd, addr)  pmd_free((tlb)->mm, pmd)

#endif /* __PAGETABLE_PMD_FOLDED */

#define __pte_free_tlb(tlb, pte, buf)   \
do {                                    \
	pgtable_pte_page_dtor(pte);     \
	tlb_remove_page((tlb), pte);    \
} while (0)

#endif /* _ASM_RISCV_PGALLOC_H */

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