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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _ASM_M32R_PGTABLE_2LEVEL_H
2#define _ASM_M32R_PGTABLE_2LEVEL_H
3
4#ifdef __KERNEL__
5
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
7/*
8 * traditional M32R two-level paging structure:
9 */
10
11#define PGDIR_SHIFT 22
12#define PTRS_PER_PGD 1024
13
14/*
15 * the M32R is two-level, so we don't really have any
16 * PMD directory physically.
17 */
18#define PMD_SHIFT 22
19#define PTRS_PER_PMD 1
20
21#define PTRS_PER_PTE 1024
22
23#define pte_ERROR(e) \
24 printk("%s:%d: bad pte %08lx.\n", __FILE__, __LINE__, pte_val(e))
25#define pmd_ERROR(e) \
26 printk("%s:%d: bad pmd %08lx.\n", __FILE__, __LINE__, pmd_val(e))
27#define pgd_ERROR(e) \
28 printk("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e))
29
30/*
31 * The "pgd_xxx()" functions here are trivial for a folded two-level
32 * setup: the pgd is never bad, and a pmd always exists (as it's folded
33 * into the pgd entry)
34 */
35static inline int pgd_none(pgd_t pgd) { return 0; }
36static inline int pgd_bad(pgd_t pgd) { return 0; }
37static inline int pgd_present(pgd_t pgd) { return 1; }
38#define pgd_clear(xp) do { } while (0)
39
40/*
41 * Certain architectures need to do special things when PTEs
42 * within a page table are directly modified. Thus, the following
43 * hook is made available.
44 */
45#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
46#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
47#define set_pte_atomic(pteptr, pteval) set_pte(pteptr, pteval)
48/*
49 * (pmds are folded into pgds so this doesnt get actually called,
50 * but the define is needed for a generic inline function.)
51 */
52#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
53#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
54
55#define pgd_page(pgd) \
56((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
57
58static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address)
59{
60 return (pmd_t *) dir;
61}
62
63#define ptep_get_and_clear(mm,addr,xp) __pte(xchg(&(xp)->pte, 0))
64#define pte_same(a, b) (pte_val(a) == pte_val(b))
65#define pte_page(x) pfn_to_page(pte_pfn(x))
66#define pte_none(x) (!pte_val(x))
67#define pte_pfn(x) (pte_val(x) >> PAGE_SHIFT)
68#define pfn_pte(pfn, prot) __pte(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
69#define pfn_pmd(pfn, prot) __pmd(((pfn) << PAGE_SHIFT) | pgprot_val(prot))
70
71#define PTE_FILE_MAX_BITS 29
72#define pte_to_pgoff(pte) (((pte_val(pte) >> 2) & 0xef) | (((pte_val(pte) >> 10)) << 7))
73#define pgoff_to_pte(off) ((pte_t) { (((off) & 0xef) << 2) | (((off) >> 7) << 10) | _PAGE_FILE })
74
75#endif /* __KERNEL__ */
76
77#endif /* _ASM_M32R_PGTABLE_2LEVEL_H */