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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 | ||
9842ceae | 28 | void sync_icache_aliases(void *kaddr, unsigned long len) |
0a28714c AK |
29 | { |
30 | unsigned long addr = (unsigned long)kaddr; | |
31 | ||
32 | if (icache_is_aliasing()) { | |
33 | __clean_dcache_area_pou(kaddr, len); | |
34 | __flush_icache_all(); | |
35 | } else { | |
36 | flush_icache_range(addr, addr + len); | |
37 | } | |
38 | } | |
39 | ||
f1a0c4aa CM |
40 | static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, |
41 | unsigned long uaddr, void *kaddr, | |
42 | unsigned long len) | |
43 | { | |
0a28714c AK |
44 | if (vma->vm_flags & VM_EXEC) |
45 | sync_icache_aliases(kaddr, len); | |
f1a0c4aa CM |
46 | } |
47 | ||
48 | /* | |
49 | * Copy user data from/to a page which is mapped into a different processes | |
50 | * address space. Really, we want to allow our "user space" model to handle | |
51 | * this. | |
f1a0c4aa CM |
52 | */ |
53 | void copy_to_user_page(struct vm_area_struct *vma, struct page *page, | |
54 | unsigned long uaddr, void *dst, const void *src, | |
55 | unsigned long len) | |
56 | { | |
f1a0c4aa CM |
57 | memcpy(dst, src, len); |
58 | flush_ptrace_access(vma, page, uaddr, dst, len); | |
f1a0c4aa CM |
59 | } |
60 | ||
f1a0c4aa CM |
61 | void __sync_icache_dcache(pte_t pte, unsigned long addr) |
62 | { | |
7249b79f | 63 | struct page *page = pte_page(pte); |
f1a0c4aa | 64 | |
0a28714c AK |
65 | if (!test_and_set_bit(PG_dcache_clean, &page->flags)) |
66 | sync_icache_aliases(page_address(page), | |
67 | PAGE_SIZE << compound_order(page)); | |
68 | else if (icache_is_aivivt()) | |
f1a0c4aa | 69 | __flush_icache_all(); |
f1a0c4aa CM |
70 | } |
71 | ||
72 | /* | |
b5b6c9e9 CM |
73 | * This function is called when a page has been modified by the kernel. Mark |
74 | * it as dirty for later flushing when mapped in user space (if executable, | |
75 | * see __sync_icache_dcache). | |
f1a0c4aa CM |
76 | */ |
77 | void flush_dcache_page(struct page *page) | |
78 | { | |
b5b6c9e9 | 79 | if (test_bit(PG_dcache_clean, &page->flags)) |
f1a0c4aa | 80 | clear_bit(PG_dcache_clean, &page->flags); |
f1a0c4aa CM |
81 | } |
82 | EXPORT_SYMBOL(flush_dcache_page); | |
83 | ||
84 | /* | |
85 | * Additional functions defined in assembly. | |
86 | */ | |
f1a0c4aa | 87 | EXPORT_SYMBOL(flush_icache_range); |