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torvalds
GitHub Repository: torvalds/linux
 Path: blob/master/arch/um/include/asm/pgtable-4level.h
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/* SPDX-License-Identifier: GPL-2.0 */

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/*

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 * Copyright 2003 PathScale Inc

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 * Derived from include/asm-i386/pgtable.h

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 */

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#ifndef __UM_PGTABLE_4LEVEL_H

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#define __UM_PGTABLE_4LEVEL_H

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#include <asm-generic/pgtable-nop4d.h>

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/* PGDIR_SHIFT determines what a fourth-level page table entry can map */

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#define PGDIR_SHIFT	39

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#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)

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#define PGDIR_MASK	(~(PGDIR_SIZE-1))

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/* PUD_SHIFT determines the size of the area a third-level page table can

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 * map

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 */

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#define PUD_SHIFT	30

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#define PUD_SIZE	(1UL << PUD_SHIFT)

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#define PUD_MASK	(~(PUD_SIZE-1))

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/* PMD_SHIFT determines the size of the area a second-level page table can

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 * map

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 */

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#define PMD_SHIFT	21

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#define PMD_SIZE	(1UL << PMD_SHIFT)

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#define PMD_MASK	(~(PMD_SIZE-1))

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/*

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 * entries per page directory level

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 */

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#define PTRS_PER_PTE 512

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#define PTRS_PER_PMD 512

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#define PTRS_PER_PUD 512

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#define PTRS_PER_PGD 512

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#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)

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#define pte_ERROR(e) \

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        printk("%s:%d: bad pte %p(%016lx).\n", __FILE__, __LINE__, &(e), \

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	       pte_val(e))

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#define pmd_ERROR(e) \

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        printk("%s:%d: bad pmd %p(%016lx).\n", __FILE__, __LINE__, &(e), \

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	       pmd_val(e))

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#define pud_ERROR(e) \

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        printk("%s:%d: bad pud %p(%016lx).\n", __FILE__, __LINE__, &(e), \

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	       pud_val(e))

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#define pgd_ERROR(e) \

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        printk("%s:%d: bad pgd %p(%016lx).\n", __FILE__, __LINE__, &(e), \

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	       pgd_val(e))

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#define pud_none(x)	(!(pud_val(x) & ~_PAGE_NEEDSYNC))

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#define	pud_bad(x)	((pud_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)

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#define pud_present(x)	(pud_val(x) & _PAGE_PRESENT)

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#define pud_populate(mm, pud, pmd) \

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	set_pud(pud, __pud(_PAGE_TABLE + __pa(pmd)))

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#define set_pud(pudptr, pudval) (*(pudptr) = (pudval))

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#define p4d_none(x)	(!(p4d_val(x) & ~_PAGE_NEEDSYNC))

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#define	p4d_bad(x)	((p4d_val(x) & (~PAGE_MASK & ~_PAGE_USER)) != _KERNPG_TABLE)

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#define p4d_present(x)	(p4d_val(x) & _PAGE_PRESENT)

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#define p4d_populate(mm, p4d, pud) \

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	set_p4d(p4d, __p4d(_PAGE_TABLE + __pa(pud)))

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#define set_p4d(p4dptr, p4dval) (*(p4dptr) = (p4dval))

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static inline int pgd_needsync(pgd_t pgd)

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{

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	return pgd_val(pgd) & _PAGE_NEEDSYNC;

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}

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static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEEDSYNC; }

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#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval))

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static inline void pud_clear (pud_t *pud)

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{

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	set_pud(pud, __pud(_PAGE_NEEDSYNC));

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}

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static inline void p4d_clear (p4d_t *p4d)

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{

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	set_p4d(p4d, __p4d(_PAGE_NEEDSYNC));

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}

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#define pud_page(pud) phys_to_page(pud_val(pud) & PAGE_MASK)

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#define pud_pgtable(pud) ((pmd_t *) __va(pud_val(pud) & PAGE_MASK))

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#define p4d_page(p4d) phys_to_page(p4d_val(p4d) & PAGE_MASK)

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#define p4d_pgtable(p4d) ((pud_t *) __va(p4d_val(p4d) & PAGE_MASK))

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static inline unsigned long pte_pfn(pte_t pte)

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{

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	return phys_to_pfn(pte_val(pte));

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}

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static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)

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{

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	return __pmd((page_nr << PAGE_SHIFT) | pgprot_val(pgprot));

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}

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#endif

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