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08964c565b
There is a lot of code which is duplicated between the 2 and 3 level implementation, with the only difference that the 3-level implementation is a bit more generalized (instead of accessing directly pte_t.pte, it uses the appropriate access macros). So this code is joined together. As obvious, a "core code nice cleanup" is not a "stability-friendly patch" so usual care applies. Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
138 lines
3.4 KiB
C
138 lines
3.4 KiB
C
/*
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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_3LEVEL_H
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#define __UM_PGTABLE_3LEVEL_H
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#include <asm-generic/pgtable-nopud.h>
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/* PGDIR_SHIFT determines what a third-level page table entry can map */
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#define PGDIR_SHIFT 30
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#define PGDIR_SIZE (1UL << PGDIR_SHIFT)
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#define PGDIR_MASK (~(PGDIR_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 USER_PTRS_PER_PGD ((TASK_SIZE + (PGDIR_SIZE - 1)) / PGDIR_SIZE)
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#define PTRS_PER_PGD 512
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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(%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 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_NEWPAGE))
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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) set_64bit((phys_t *) (pudptr), pud_val(pudval))
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static inline int pgd_newpage(pgd_t pgd)
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{
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return(pgd_val(pgd) & _PAGE_NEWPAGE);
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}
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static inline void pgd_mkuptodate(pgd_t pgd) { pgd_val(pgd) &= ~_PAGE_NEWPAGE; }
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#define set_pmd(pmdptr, pmdval) set_64bit((phys_t *) (pmdptr), pmd_val(pmdval))
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static inline pmd_t *pmd_alloc_one(struct mm_struct *mm, unsigned long address)
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{
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pmd_t *pmd = (pmd_t *) __get_free_page(GFP_KERNEL);
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if(pmd)
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memset(pmd, 0, PAGE_SIZE);
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return pmd;
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}
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static inline void pmd_free(pmd_t *pmd){
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free_page((unsigned long) pmd);
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}
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#define __pmd_free_tlb(tlb,x) do { } while (0)
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static inline void pud_clear (pud_t * pud) { }
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#define pud_page(pud) \
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((struct page *) __va(pud_val(pud) & PAGE_MASK))
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/* Find an entry in the second-level page table.. */
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#define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
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pmd_index(address))
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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 pte_t pfn_pte(pfn_t page_nr, pgprot_t pgprot)
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{
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pte_t pte;
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phys_t phys = pfn_to_phys(page_nr);
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pte_set_val(pte, phys, pgprot);
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return pte;
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}
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static inline pmd_t pfn_pmd(pfn_t 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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/*
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* Bits 0 through 3 are taken in the low part of the pte,
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* put the 32 bits of offset into the high part.
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*/
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#define PTE_FILE_MAX_BITS 32
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#ifdef CONFIG_64BIT
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#define pte_to_pgoff(p) ((p).pte >> 32)
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#define pgoff_to_pte(off) ((pte_t) { ((off) << 32) | _PAGE_FILE })
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#else
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#define pte_to_pgoff(pte) ((pte).pte_high)
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#define pgoff_to_pte(off) ((pte_t) { _PAGE_FILE, (off) })
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#endif
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#endif
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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