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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>
82 lines
2.5 KiB
C
82 lines
2.5 KiB
C
#ifndef _ASM_M32R_PGTABLE_2LEVEL_H
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#define _ASM_M32R_PGTABLE_2LEVEL_H
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#ifdef __KERNEL__
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/*
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* traditional M32R 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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* the M32R 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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#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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#define pgd_clear(xp) do { } while (0)
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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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#define set_pte_atomic(pteptr, pteval) set_pte(pteptr, pteval)
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/*
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* (pmds are folded into pgds so this doesnt 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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#ifndef CONFIG_DISCONTIGMEM
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#define pgd_page(pgd) (mem_map + ((pgd_val(pgd) >> PAGE_SHIFT) - PFN_BASE))
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#endif /* !CONFIG_DISCONTIGMEM */
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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 ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0))
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#define pte_same(a, b) (pte_val(a) == pte_val(b))
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#define pte_page(x) pfn_to_page(pte_pfn(x))
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#define pte_none(x) (!pte_val(x))
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#define pte_pfn(x) (pte_val(x) >> 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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#define PTE_FILE_MAX_BITS 29
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#define pte_to_pgoff(pte) (((pte_val(pte) >> 2) & 0xef) | (((pte_val(pte) >> 10)) << 7))
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#define pgoff_to_pte(off) ((pte_t) { (((off) & 0xef) << 2) | (((off) >> 7) << 10) | _PAGE_FILE })
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#endif /* __KERNEL__ */
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#endif /* _ASM_M32R_PGTABLE_2LEVEL_H */
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