1/* 2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) 3 * Copyright 2003 PathScale, Inc. 4 * Derived from include/asm-i386/pgtable.h 5 * Licensed under the GPL 6 */ 7 8#ifndef __UM_PGTABLE_2LEVEL_H 9#define __UM_PGTABLE_2LEVEL_H 10 11#include <asm-generic/pgtable-nopmd.h> 12 13/* PGDIR_SHIFT determines what a third-level page table entry can map */ 14 15#define PGDIR_SHIFT 22 16#define PGDIR_SIZE (1UL << PGDIR_SHIFT) 17#define PGDIR_MASK (~(PGDIR_SIZE-1)) 18 19/* 20 * entries per page directory level: the i386 is two-level, so 21 * we don't really have any PMD directory physically. 22 */ 23#define PTRS_PER_PTE 1024 24#define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE) 25#define PTRS_PER_PGD 1024 26#define FIRST_USER_ADDRESS 0 27 28#define pte_ERROR(e) \ 29 printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \ 30 pte_val(e)) 31#define pgd_ERROR(e) \ 32 printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \ 33 pgd_val(e)) 34 35static inline int pgd_newpage(pgd_t pgd) { return 0; } 36static inline void pgd_mkuptodate(pgd_t pgd) { } 37 38#define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) 39 40#define pte_pfn(x) phys_to_pfn(pte_val(x)) 41#define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot)) 42#define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot)) 43 44#define pmd_page_vaddr(pmd) \ 45 ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) 46 47/* 48 * Bits 0 through 4 are taken 49 */ 50#define PTE_FILE_MAX_BITS 27 51 52#define pte_to_pgoff(pte) (pte_val(pte) >> 5) 53 54#define pgoff_to_pte(off) ((pte_t) { ((off) << 5) + _PAGE_FILE }) 55 56#endif 57