1 #ifndef _ASM_M32R_PGTABLE_2LEVEL_H
2 #define _ASM_M32R_PGTABLE_2LEVEL_H
6 #include <linux/config.h>
9 * traditional M32R two-level paging structure:
12 #define PGDIR_SHIFT 22
13 #define PTRS_PER_PGD 1024
16 * the M32R is two-level, so we don't really have any
17 * PMD directory physically.
20 #define PTRS_PER_PMD 1
22 #define PTRS_PER_PTE 1024
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))
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
36 static inline int pgd_none(pgd_t pgd) { return 0; }
37 static inline int pgd_bad(pgd_t pgd) { return 0; }
38 static inline int pgd_present(pgd_t pgd) { return 1; }
39 #define pgd_clear(xp) do { } while (0)
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.
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)
50 * (pmds are folded into pgds so this doesnt get actually called,
51 * but the define is needed for a generic inline function.)
53 #define set_pmd(pmdptr, pmdval) (*(pmdptr) = pmdval)
54 #define set_pgd(pgdptr, pgdval) (*(pgdptr) = pgdval)
56 #define pgd_page(pgd) \
57 ((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
59 static inline pmd_t *pmd_offset(pgd_t * dir, unsigned long address)
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))
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 })
76 #endif /* __KERNEL__ */
78 #endif /* _ASM_M32R_PGTABLE_2LEVEL_H */