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/*
45 * (pmds are folded into pgds so this doesn't get actually called,
46 * but the define is needed for a generic inline function.)
47 */
48#define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
49#define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
50
51#define pgd_page(pgd) \
52((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
53
54static inline pmd_t * pmd_offset(pgd_t * dir, unsigned long address)
55{
56	return (pmd_t *) dir;
57}
58#endif /* !__ASSEMBLY__ */
59
60#endif /* __ASM_SH_PGTABLE_2LEVEL_H */
61