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1#ifndef __ASM_SH_PGTABLE_2LEVEL_H
2#define __ASM_SH_PGTABLE_2LEVEL_H
3
4/*
5 * traditional two-level paging structure:
6 */
7
8#define PGDIR_SHIFT 22
9#define PTRS_PER_PGD 1024
10
11/*
12 * this is two-level, so we don't really have any
13 * PMD directory physically.
14 */
15#define PMD_SHIFT 22
16#define PTRS_PER_PMD 1
17
18#define PTRS_PER_PTE 1024
19
20#ifndef __ASSEMBLY__
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))
27
28/*
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
31 * into the pgd entry)
32 */
33static inline int pgd_none(pgd_t pgd) { return 0; }
34static inline int pgd_bad(pgd_t pgd) { return 0; }
35static inline int pgd_present(pgd_t pgd) { return 1; }
36static inline void pgd_clear (pgd_t * pgdp) { }
37
38/*
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.
42 */
43#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
44#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
45
46/*
47 * (pmds are folded into pgds so this doesn't get actually called,
48 * but the define is needed for a generic inline function.)
49 */
50#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
51#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
52
53#define pgd_page(pgd) \
54((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
55
56static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
57{
58 return (pmd_t *) dir;
59}
60
61#define pte_pfn(x) ((unsigned long)(((x).pte >> PAGE_SHIFT)))
62#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
63#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
64
65#endif /* !__ASSEMBLY__ */
66
67#endif /* __ASM_SH_PGTABLE_2LEVEL_H */