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