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f1a0c4aa CM |
1 | /* |
2 | * Based on arch/arm/mm/flush.c | |
3 | * | |
4 | * Copyright (C) 1995-2002 Russell King | |
5 | * Copyright (C) 2012 ARM Ltd. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
8 | * it under the terms of the GNU General Public License version 2 as | |
9 | * published by the Free Software Foundation. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
18 | */ | |
19 | ||
20 | #include <linux/export.h> | |
21 | #include <linux/mm.h> | |
22 | #include <linux/pagemap.h> | |
23 | ||
24 | #include <asm/cacheflush.h> | |
25 | #include <asm/cachetype.h> | |
26 | #include <asm/tlbflush.h> | |
27 | ||
28 | #include "mm.h" | |
29 | ||
f1a0c4aa CM |
30 | void flush_cache_range(struct vm_area_struct *vma, unsigned long start, |
31 | unsigned long end) | |
32 | { | |
33 | if (vma->vm_flags & VM_EXEC) | |
34 | __flush_icache_all(); | |
35 | } | |
36 | ||
0a28714c AK |
37 | static void sync_icache_aliases(void *kaddr, unsigned long len) |
38 | { | |
39 | unsigned long addr = (unsigned long)kaddr; | |
40 | ||
41 | if (icache_is_aliasing()) { | |
42 | __clean_dcache_area_pou(kaddr, len); | |
43 | __flush_icache_all(); | |
44 | } else { | |
45 | flush_icache_range(addr, addr + len); | |
46 | } | |
47 | } | |
48 | ||
f1a0c4aa CM |
49 | static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, |
50 | unsigned long uaddr, void *kaddr, | |
51 | unsigned long len) | |
52 | { | |
0a28714c AK |
53 | if (vma->vm_flags & VM_EXEC) |
54 | sync_icache_aliases(kaddr, len); | |
f1a0c4aa CM |
55 | } |
56 | ||
57 | /* | |
58 | * Copy user data from/to a page which is mapped into a different processes | |
59 | * address space. Really, we want to allow our "user space" model to handle | |
60 | * this. | |
61 | * | |
62 | * Note that this code needs to run on the current CPU. | |
63 | */ | |
64 | void copy_to_user_page(struct vm_area_struct *vma, struct page *page, | |
65 | unsigned long uaddr, void *dst, const void *src, | |
66 | unsigned long len) | |
67 | { | |
f1a0c4aa | 68 | preempt_disable(); |
f1a0c4aa CM |
69 | memcpy(dst, src, len); |
70 | flush_ptrace_access(vma, page, uaddr, dst, len); | |
f1a0c4aa | 71 | preempt_enable(); |
f1a0c4aa CM |
72 | } |
73 | ||
f1a0c4aa CM |
74 | void __sync_icache_dcache(pte_t pte, unsigned long addr) |
75 | { | |
7249b79f | 76 | struct page *page = pte_page(pte); |
f1a0c4aa | 77 | |
7249b79f CM |
78 | /* no flushing needed for anonymous pages */ |
79 | if (!page_mapping(page)) | |
f1a0c4aa CM |
80 | return; |
81 | ||
0a28714c AK |
82 | if (!test_and_set_bit(PG_dcache_clean, &page->flags)) |
83 | sync_icache_aliases(page_address(page), | |
84 | PAGE_SIZE << compound_order(page)); | |
85 | else if (icache_is_aivivt()) | |
f1a0c4aa | 86 | __flush_icache_all(); |
f1a0c4aa CM |
87 | } |
88 | ||
89 | /* | |
b5b6c9e9 CM |
90 | * This function is called when a page has been modified by the kernel. Mark |
91 | * it as dirty for later flushing when mapped in user space (if executable, | |
92 | * see __sync_icache_dcache). | |
f1a0c4aa CM |
93 | */ |
94 | void flush_dcache_page(struct page *page) | |
95 | { | |
b5b6c9e9 | 96 | if (test_bit(PG_dcache_clean, &page->flags)) |
f1a0c4aa | 97 | clear_bit(PG_dcache_clean, &page->flags); |
f1a0c4aa CM |
98 | } |
99 | EXPORT_SYMBOL(flush_dcache_page); | |
100 | ||
101 | /* | |
102 | * Additional functions defined in assembly. | |
103 | */ | |
f1a0c4aa | 104 | EXPORT_SYMBOL(flush_icache_range); |