46a82b2d55
One of the changes necessary for shared page tables is to standardize the pxx_page macros. pte_page and pmd_page have always returned the struct page associated with their entry, while pte_page_kernel and pmd_page_kernel have returned the kernel virtual address. pud_page and pgd_page, on the other hand, return the kernel virtual address. Shared page tables needs pud_page and pgd_page to return the actual page structures. There are very few actual users of these functions, so it is simple to standardize their usage. Since this is basic cleanup, I am submitting these changes as a standalone patch. Per Hugh Dickins' comments about it, I am also changing the pxx_page_kernel macros to pxx_page_vaddr to clarify their meaning. Signed-off-by: Dave McCracken <dmccr@us.ibm.com> Cc: Hugh Dickins <hugh@veritas.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
70 lines
2 KiB
C
70 lines
2 KiB
C
#ifndef __ASM_SH_PGTABLE_2LEVEL_H
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#define __ASM_SH_PGTABLE_2LEVEL_H
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/*
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* traditional two-level paging structure:
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*/
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#define PGDIR_SHIFT 22
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#define PTRS_PER_PGD 1024
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/*
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* this is two-level, so we don't really have any
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* PMD directory physically.
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*/
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#define PMD_SHIFT 22
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#define PTRS_PER_PMD 1
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#define PTRS_PER_PTE 1024
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#ifndef __ASSEMBLY__
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#define pte_ERROR(e) \
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printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
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#define pmd_ERROR(e) \
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printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
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#define pgd_ERROR(e) \
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printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
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/*
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* The "pgd_xxx()" functions here are trivial for a folded two-level
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* setup: the pgd is never bad, and a pmd always exists (as it's folded
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* into the pgd entry)
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*/
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static inline int pgd_none(pgd_t pgd) { return 0; }
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static inline int pgd_bad(pgd_t pgd) { return 0; }
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static inline int pgd_present(pgd_t pgd) { return 1; }
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static inline void pgd_clear (pgd_t * pgdp) { }
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/*
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* Certain architectures need to do special things when PTEs
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* within a page table are directly modified. Thus, the following
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* hook is made available.
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*/
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#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
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#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
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/*
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* (pmds are folded into pgds so this doesn't get actually called,
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* but the define is needed for a generic inline function.)
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*/
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#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
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#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
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#define pgd_page_vaddr(pgd) \
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((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
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#define pgd_page(pgd) \
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(phys_to_page(pgd_val(pgd)))
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static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
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{
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return (pmd_t *) dir;
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}
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#define pte_pfn(x) ((unsigned long)(((x).pte >> PAGE_SHIFT)))
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#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
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#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
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#endif /* !__ASSEMBLY__ */
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#endif /* __ASM_SH_PGTABLE_2LEVEL_H */
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