Contents of /alx-src/tags/kernel26-2.6.12-alx-r9/include/asm-m32r/pgtable-2level.h
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
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Wed Mar 4 11:03:09 2009 UTC (15 years, 3 months ago) by niro
File MIME type: text/plain
File size: 2454 byte(s)
Tag kernel26-2.6.12-alx-r9
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 | */ |
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) |
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 | |
59 | static 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 */ |