/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_PGTABLE_H
#define _LINUX_PGTABLE_H
#include <linux/pfn.h>
#include <asm/pgtable.h>
#define PMD_ORDER (PMD_SHIFT - PAGE_SHIFT)
#define PUD_ORDER (PUD_SHIFT - PAGE_SHIFT)
#ifndef __ASSEMBLY__
#ifdef CONFIG_MMU
#include <linux/mm_types.h>
#include <linux/bug.h>
#include <linux/errno.h>
#include <asm-generic/pgtable_uffd.h>
#include <linux/page_table_check.h>
#if 5 - defined(__PAGETABLE_P4D_FOLDED) - defined(__PAGETABLE_PUD_FOLDED) - \
defined(__PAGETABLE_PMD_FOLDED) != CONFIG_PGTABLE_LEVELS
#error CONFIG_PGTABLE_LEVELS is not consistent with __PAGETABLE_{P4D,PUD,PMD}_FOLDED
#endif
/*
* On almost all architectures and configurations, 0 can be used as the
* upper ceiling to free_pgtables(): on many architectures it has the same
* effect as using TASK_SIZE. However, there is one configuration which
* must impose a more careful limit, to avoid freeing kernel pgtables.
*/
#ifndef USER_PGTABLES_CEILING
#define USER_PGTABLES_CEILING 0UL
#endif
/*
* This defines the first usable user address. Platforms
* can override its value with custom FIRST_USER_ADDRESS
* defined in their respective <asm/pgtable.h>.
*/
#ifndef FIRST_USER_ADDRESS
#define FIRST_USER_ADDRESS 0UL
#endif
/*
* This defines the generic helper for accessing PMD page
* table page. Although platforms can still override this
* via their respective <asm/pgtable.h>.
*/
#ifndef pmd_pgtable
#define pmd_pgtable(pmd) pmd_pag
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