/* * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) * Copyright 2003 PathScale, Inc. * Derived from include/asm-i386/pgtable.h * Licensed under the GPL */ #ifndef __UM_PGTABLE_2LEVEL_H #define __UM_PGTABLE_2LEVEL_H #include <asm-generic/pgtable-nopmd.h> /* PGDIR_SHIFT determines what a third-level page table entry can map */ #define PGDIR_SHIFT 22 #define PGDIR_SIZE (1UL << PGDIR_SHIFT) #define PGDIR_MASK (~(PGDIR_SIZE-1)) /* * entries per page directory level: the i386 is two-level, so * we don't really have any PMD directory physically. */ #define PTRS_PER_PTE 1024 #define USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE) #define PTRS_PER_PGD 1024 #define FIRST_USER_ADDRESS 0 #define pte_ERROR(e) \ printk("%s:%d: bad pte %p(%08lx).\n", __FILE__, __LINE__, &(e), \ pte_val(e)) #define pgd_ERROR(e) \ printk("%s:%d: bad pgd %p(%08lx).\n", __FILE__, __LINE__, &(e), \ pgd_val(e)) static inline int pgd_newpage(pgd_t pgd) { return 0; } static inline void pgd_mkuptodate(pgd_t pgd) { } #define pte_present(x) (pte_val(x) & (_PAGE_PRESENT | _PAGE_PROTNONE)) static inline pte_t pte_mknewprot(pte_t pte) { pte_val(pte) |= _PAGE_NEWPROT; return(pte); } static inline pte_t pte_mknewpage(pte_t pte) { pte_val(pte) |= _PAGE_NEWPAGE; return(pte); } static inline void set_pte(pte_t *pteptr, pte_t pteval) { /* If it's a swap entry, it needs to be marked _PAGE_NEWPAGE so * fix_range knows to unmap it. _PAGE_NEWPROT is specific to * mapped pages. */ *pteptr = pte_mknewpage(pteval); if(pte_present(*pteptr)) *pteptr = pte_mknewprot(*pteptr); } #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) #define set_pmd(pmdptr, pmdval) (*(pmdptr) = (pmdval)) #define pte_page(x) pfn_to_page(pte_pfn(x)) #define pte_none(x) !(pte_val(x) & ~_PAGE_NEWPAGE) #define pte_pfn(x) phys_to_pfn(pte_val(x)) #define pfn_pte(pfn, prot) __pte(pfn_to_phys(pfn) | pgprot_val(prot)) #define pfn_pmd(pfn, prot) __pmd(pfn_to_phys(pfn) | pgprot_val(prot)) #define pmd_page_kernel(pmd) \ ((unsigned long) __va(pmd_val(pmd) & PAGE_MASK)) /* * Bits 0 through 3 are taken */ #define PTE_FILE_MAX_BITS 28 #define pte_to_pgoff(pte) (pte_val(pte) >> 4) #define pgoff_to_pte(off) ((pte_t) { ((off) << 4) + _PAGE_FILE }) #endif