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awilliam
GitHub Repository: awilliam/linux-vfio
 Path: blob/master/arch/um/include/asm/pgtable-2level.h
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/*

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 * Copyright (C) 2000, 2001, 2002 Jeff Dike ([email protected])

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 * Copyright 2003 PathScale, Inc.

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

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 * Licensed under the GPL

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 */

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#ifndef __UM_PGTABLE_2LEVEL_H

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#define __UM_PGTABLE_2LEVEL_H

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

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

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#define PGDIR_SHIFT	22

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#define PGDIR_SIZE	(1UL << PGDIR_SHIFT)

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#define PGDIR_MASK	(~(PGDIR_SIZE-1))

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/*

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 * entries per page directory level: the i386 is two-level, so

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 * we don't really have any PMD directory physically.

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 */

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#define PTRS_PER_PTE	1024

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

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#define PTRS_PER_PGD	1024

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#define FIRST_USER_ADDRESS	0

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#define pte_ERROR(e) \

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        printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \

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	       pte_val(e))

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#define pgd_ERROR(e) \

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        printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \

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	       pgd_val(e))

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static inline int pgd_newpage(pgd_t pgd)	{ return 0; }

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static inline void pgd_mkuptodate(pgd_t pgd)	{ }

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

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#define pte_pfn(x) phys_to_pfn(pte_val(x))

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#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot))

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#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot))

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/*

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 * Bits 0 through 4 are taken

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 */

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#define PTE_FILE_MAX_BITS	27

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#define pte_to_pgoff(pte) (pte_val(pte) >> 5)

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#define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE })

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#endif

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