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1da177e4 LT |
1 | /* |
2 | * arch/sh/mm/pg-sh4.c | |
3 | * | |
4 | * Copyright (C) 1999, 2000, 2002 Niibe Yutaka | |
8b395265 | 5 | * Copyright (C) 2002 - 2005 Paul Mundt |
1da177e4 LT |
6 | * |
7 | * Released under the terms of the GNU GPL v2.0. | |
8 | */ | |
1da177e4 LT |
9 | #include <linux/init.h> |
10 | #include <linux/mman.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/threads.h> | |
13 | #include <asm/addrspace.h> | |
14 | #include <asm/page.h> | |
15 | #include <asm/pgtable.h> | |
16 | #include <asm/processor.h> | |
17 | #include <asm/cache.h> | |
18 | #include <asm/io.h> | |
19 | #include <asm/uaccess.h> | |
20 | #include <asm/pgalloc.h> | |
21 | #include <asm/mmu_context.h> | |
22 | #include <asm/cacheflush.h> | |
23 | ||
24 | extern struct semaphore p3map_sem[]; | |
25 | ||
8b395265 PM |
26 | #define CACHE_ALIAS (cpu_data->dcache.alias_mask) |
27 | ||
1da177e4 LT |
28 | /* |
29 | * clear_user_page | |
30 | * @to: P1 address | |
31 | * @address: U0 address to be mapped | |
32 | * @page: page (virt_to_page(to)) | |
33 | */ | |
34 | void clear_user_page(void *to, unsigned long address, struct page *page) | |
35 | { | |
36 | __set_bit(PG_mapped, &page->flags); | |
37 | if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) | |
38 | clear_page(to); | |
39 | else { | |
1da177e4 LT |
40 | unsigned long phys_addr = PHYSADDR(to); |
41 | unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS); | |
8b395265 PM |
42 | pgd_t *pgd = pgd_offset_k(p3_addr); |
43 | pud_t *pud = pud_offset(pgd, p3_addr); | |
44 | pmd_t *pmd = pmd_offset(pud, p3_addr); | |
1da177e4 LT |
45 | pte_t *pte = pte_offset_kernel(pmd, p3_addr); |
46 | pte_t entry; | |
47 | unsigned long flags; | |
48 | ||
21440cf0 | 49 | entry = pfn_pte(phys_addr >> PAGE_SHIFT, PAGE_KERNEL); |
1da177e4 LT |
50 | down(&p3map_sem[(address & CACHE_ALIAS)>>12]); |
51 | set_pte(pte, entry); | |
52 | local_irq_save(flags); | |
53 | __flush_tlb_page(get_asid(), p3_addr); | |
54 | local_irq_restore(flags); | |
55 | update_mmu_cache(NULL, p3_addr, entry); | |
56 | __clear_user_page((void *)p3_addr, to); | |
57 | pte_clear(&init_mm, p3_addr, pte); | |
58 | up(&p3map_sem[(address & CACHE_ALIAS)>>12]); | |
59 | } | |
60 | } | |
61 | ||
62 | /* | |
63 | * copy_user_page | |
64 | * @to: P1 address | |
65 | * @from: P1 address | |
66 | * @address: U0 address to be mapped | |
67 | * @page: page (virt_to_page(to)) | |
68 | */ | |
8b395265 | 69 | void copy_user_page(void *to, void *from, unsigned long address, |
1da177e4 LT |
70 | struct page *page) |
71 | { | |
72 | __set_bit(PG_mapped, &page->flags); | |
73 | if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) | |
74 | copy_page(to, from); | |
75 | else { | |
1da177e4 LT |
76 | unsigned long phys_addr = PHYSADDR(to); |
77 | unsigned long p3_addr = P3SEG + (address & CACHE_ALIAS); | |
8b395265 PM |
78 | pgd_t *pgd = pgd_offset_k(p3_addr); |
79 | pud_t *pud = pud_offset(pgd, p3_addr); | |
80 | pmd_t *pmd = pmd_offset(pud, p3_addr); | |
1da177e4 LT |
81 | pte_t *pte = pte_offset_kernel(pmd, p3_addr); |
82 | pte_t entry; | |
83 | unsigned long flags; | |
84 | ||
21440cf0 | 85 | entry = pfn_pte(phys_addr >> PAGE_SHIFT, PAGE_KERNEL); |
1da177e4 LT |
86 | down(&p3map_sem[(address & CACHE_ALIAS)>>12]); |
87 | set_pte(pte, entry); | |
88 | local_irq_save(flags); | |
89 | __flush_tlb_page(get_asid(), p3_addr); | |
90 | local_irq_restore(flags); | |
91 | update_mmu_cache(NULL, p3_addr, entry); | |
92 | __copy_user_page((void *)p3_addr, from, to); | |
93 | pte_clear(&init_mm, p3_addr, pte); | |
94 | up(&p3map_sem[(address & CACHE_ALIAS)>>12]); | |
95 | } | |
96 | } | |
97 | ||
98 | /* | |
99 | * For SH-4, we have our own implementation for ptep_get_and_clear | |
100 | */ | |
101 | inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep) | |
102 | { | |
103 | pte_t pte = *ptep; | |
104 | ||
105 | pte_clear(mm, addr, ptep); | |
106 | if (!pte_not_present(pte)) { | |
107 | unsigned long pfn = pte_pfn(pte); | |
108 | if (pfn_valid(pfn)) { | |
109 | struct page *page = pfn_to_page(pfn); | |
110 | struct address_space *mapping = page_mapping(page); | |
111 | if (!mapping || !mapping_writably_mapped(mapping)) | |
112 | __clear_bit(PG_mapped, &page->flags); | |
113 | } | |
114 | } | |
115 | return pte; | |
116 | } | |
117 |