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Current File : //lib/modules/4.15.0-1044-aws/build/arch/unicore32/include/asm/pgalloc.h
/*
 * linux/arch/unicore32/include/asm/pgalloc.h
 *
 * Code specific to PKUnity SoC and UniCore ISA
 *
 * Copyright (C) 2001-2010 GUAN Xue-tao
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */
#ifndef __UNICORE_PGALLOC_H__
#define __UNICORE_PGALLOC_H__

#include <asm/pgtable-hwdef.h>
#include <asm/processor.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>

#define check_pgt_cache()		do { } while (0)

#define _PAGE_USER_TABLE	(PMD_TYPE_TABLE | PMD_PRESENT)
#define _PAGE_KERNEL_TABLE	(PMD_TYPE_TABLE | PMD_PRESENT)

extern pgd_t *get_pgd_slow(struct mm_struct *mm);
extern void free_pgd_slow(struct mm_struct *mm, pgd_t *pgd);

#define pgd_alloc(mm)			get_pgd_slow(mm)
#define pgd_free(mm, pgd)		free_pgd_slow(mm, pgd)

#define PGALLOC_GFP	(GFP_KERNEL | __GFP_ZERO)

/*
 * Allocate one PTE table.
 */
static inline pte_t *
pte_alloc_one_kernel(struct mm_struct *mm, unsigned long addr)
{
	pte_t *pte;

	pte = (pte_t *)__get_free_page(PGALLOC_GFP);
	if (pte)
		clean_dcache_area(pte, PTRS_PER_PTE * sizeof(pte_t));

	return pte;
}

static inline pgtable_t
pte_alloc_one(struct mm_struct *mm, unsigned long addr)
{
	struct page *pte;

	pte = alloc_pages(PGALLOC_GFP, 0);
	if (!pte)
		return NULL;
	if (!PageHighMem(pte)) {
		void *page = page_address(pte);
		clean_dcache_area(page, PTRS_PER_PTE * sizeof(pte_t));
	}
	if (!pgtable_page_ctor(pte)) {
		__free_page(pte);
	}

	return pte;
}

/*
 * Free one PTE table.
 */
static inline void pte_free_kernel(struct mm_struct *mm, pte_t *pte)
{
	if (pte)
		free_page((unsigned long)pte);
}

static inline void pte_free(struct mm_struct *mm, pgtable_t pte)
{
	pgtable_page_dtor(pte);
	__free_page(pte);
}

static inline void __pmd_populate(pmd_t *pmdp, unsigned long pmdval)
{
	set_pmd(pmdp, __pmd(pmdval));
	flush_pmd_entry(pmdp);
}

/*
 * Populate the pmdp entry with a pointer to the pte.  This pmd is part
 * of the mm address space.
 */
static inline void
pmd_populate_kernel(struct mm_struct *mm, pmd_t *pmdp, pte_t *ptep)
{
	unsigned long pte_ptr = (unsigned long)ptep;

	/*
	 * The pmd must be loaded with the physical
	 * address of the PTE table
	 */
	__pmd_populate(pmdp, __pa(pte_ptr) | _PAGE_KERNEL_TABLE);
}

static inline void
pmd_populate(struct mm_struct *mm, pmd_t *pmdp, pgtable_t ptep)
{
	__pmd_populate(pmdp,
			page_to_pfn(ptep) << PAGE_SHIFT | _PAGE_USER_TABLE);
}
#define pmd_pgtable(pmd) pmd_page(pmd)

#endif

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