Merge branch 'for-linus' of git://oss.sgi.com:8090/xfs/xfs-pull
[linux-2.6] / arch / sh / mm / pg-sh7705.c
1 /*
2  * arch/sh/mm/pg-sh7705.c
3  *
4  * Copyright (C) 1999, 2000  Niibe Yutaka
5  * Copyright (C) 2004  Alex Song
6  *
7  * This file is subject to the terms and conditions of the GNU General Public
8  * License.  See the file "COPYING" in the main directory of this archive
9  * for more details.
10  *
11  */
12
13 #include <linux/init.h>
14 #include <linux/mman.h>
15 #include <linux/mm.h>
16 #include <linux/threads.h>
17 #include <linux/fs.h>
18 #include <asm/addrspace.h>
19 #include <asm/page.h>
20 #include <asm/pgtable.h>
21 #include <asm/processor.h>
22 #include <asm/cache.h>
23 #include <asm/io.h>
24 #include <asm/uaccess.h>
25 #include <asm/pgalloc.h>
26 #include <asm/mmu_context.h>
27 #include <asm/cacheflush.h>
28
29 static inline void __flush_purge_virtual_region(void *p1, void *virt, int size)
30 {
31         unsigned long v;
32         unsigned long begin, end;
33         unsigned long p1_begin;
34
35
36         begin = L1_CACHE_ALIGN((unsigned long)virt);
37         end = L1_CACHE_ALIGN((unsigned long)virt + size);
38
39         p1_begin = (unsigned long)p1 & ~(L1_CACHE_BYTES - 1);
40
41         /* do this the slow way as we may not have TLB entries
42          * for virt yet. */
43         for (v = begin; v < end; v += L1_CACHE_BYTES) {
44                 unsigned long p;
45                 unsigned long ways, addr;
46
47                 p = __pa(p1_begin);
48
49                 ways = current_cpu_data.dcache.ways;
50                 addr = CACHE_OC_ADDRESS_ARRAY;
51
52                 do {
53                         unsigned long data;
54
55                         addr |= (v & current_cpu_data.dcache.entry_mask);
56
57                         data = ctrl_inl(addr);
58                         if ((data & CACHE_PHYSADDR_MASK) ==
59                                (p & CACHE_PHYSADDR_MASK)) {
60                                 data &= ~(SH_CACHE_UPDATED|SH_CACHE_VALID);
61                                 ctrl_outl(data, addr);
62                         }
63
64                         addr += current_cpu_data.dcache.way_incr;
65                 } while (--ways);
66
67                 p1_begin += L1_CACHE_BYTES;
68         }
69 }
70
71 /*
72  * clear_user_page
73  * @to: P1 address
74  * @address: U0 address to be mapped
75  */
76 void clear_user_page(void *to, unsigned long address, struct page *pg)
77 {
78         struct page *page = virt_to_page(to);
79
80         __set_bit(PG_mapped, &page->flags);
81         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
82                 clear_page(to);
83                 __flush_wback_region(to, PAGE_SIZE);
84         } else {
85                 __flush_purge_virtual_region(to,
86                                              (void *)(address & 0xfffff000),
87                                              PAGE_SIZE);
88                 clear_page(to);
89                 __flush_wback_region(to, PAGE_SIZE);
90         }
91 }
92
93 /*
94  * copy_user_page
95  * @to: P1 address
96  * @from: P1 address
97  * @address: U0 address to be mapped
98  */
99 void copy_user_page(void *to, void *from, unsigned long address, struct page *pg)
100 {
101         struct page *page = virt_to_page(to);
102
103
104         __set_bit(PG_mapped, &page->flags);
105         if (((address ^ (unsigned long)to) & CACHE_ALIAS) == 0) {
106                 copy_page(to, from);
107                 __flush_wback_region(to, PAGE_SIZE);
108         } else {
109                 __flush_purge_virtual_region(to,
110                                              (void *)(address & 0xfffff000),
111                                              PAGE_SIZE);
112                 copy_page(to, from);
113                 __flush_wback_region(to, PAGE_SIZE);
114         }
115 }
116
117 /*
118  * For SH7705, we have our own implementation for ptep_get_and_clear
119  * Copied from pg-sh4.c
120  */
121 pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
122 {
123         pte_t pte = *ptep;
124
125         pte_clear(mm, addr, ptep);
126         if (!pte_not_present(pte)) {
127                 unsigned long pfn = pte_pfn(pte);
128                 if (pfn_valid(pfn)) {
129                         struct page *page = pfn_to_page(pfn);
130                         struct address_space *mapping = page_mapping(page);
131                         if (!mapping || !mapping_writably_mapped(mapping))
132                                 __clear_bit(PG_mapped, &page->flags);
133                 }
134         }
135
136         return pte;
137 }
138