1 #ifndef __ASM_SH_PGTABLE_2LEVEL_H
2 #define __ASM_SH_PGTABLE_2LEVEL_H
5 * traditional two-level paging structure:
9 #define PTRS_PER_PGD 1024
12 * this is two-level, so we don't really have any
13 * PMD directory physically.
16 #define PTRS_PER_PMD 1
18 #define PTRS_PER_PTE 1024
21 #define pte_ERROR(e) \
22 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
23 #define pmd_ERROR(e) \
24 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
25 #define pgd_ERROR(e) \
26 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
29 * The "pgd_xxx()" functions here are trivial for a folded two-level
30 * setup: the pgd is never bad, and a pmd always exists (as it's folded
33 static inline int pgd_none(pgd_t pgd) { return 0; }
34 static inline int pgd_bad(pgd_t pgd) { return 0; }
35 static inline int pgd_present(pgd_t pgd) { return 1; }
36 static inline void pgd_clear (pgd_t * pgdp) { }
39 * Certain architectures need to do special things when PTEs
40 * within a page table are directly modified. Thus, the following
41 * hook is made available.
43 #define set_pte(pteptr, pteval) (*(pteptr) = pteval)
44 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
47 * (pmds are folded into pgds so this doesn't get actually called,
48 * but the define is needed for a generic inline function.)
50 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
51 #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
53 #define pgd_page_vaddr(pgd) \
54 ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
56 #define pgd_page(pgd) \
57 (phys_to_page(pgd_val(pgd)))
59 static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
64 #define pte_pfn(x) ((unsigned long)(((x).pte >> PAGE_SHIFT)))
65 #define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
66 #define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
68 #endif /* !__ASSEMBLY__ */
70 #endif /* __ASM_SH_PGTABLE_2LEVEL_H */