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