Merge branches 'pm-core', 'pm-clk', 'pm-domains' and 'pm-pci'
[deliverable/linux.git] / arch / arm64 / mm / flush.c
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
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
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
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 {
53 if (vma->vm_flags & VM_EXEC)
54 sync_icache_aliases(kaddr, len);
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 void copy_to_user_page(struct vm_area_struct *vma, struct page *page,
63 unsigned long uaddr, void *dst, const void *src,
64 unsigned long len)
65 {
66 memcpy(dst, src, len);
67 flush_ptrace_access(vma, page, uaddr, dst, len);
68 }
69
70 void __sync_icache_dcache(pte_t pte, unsigned long addr)
71 {
72 struct page *page = pte_page(pte);
73
74 if (!test_and_set_bit(PG_dcache_clean, &page->flags))
75 sync_icache_aliases(page_address(page),
76 PAGE_SIZE << compound_order(page));
77 else if (icache_is_aivivt())
78 __flush_icache_all();
79 }
80
81 /*
82 * This function is called when a page has been modified by the kernel. Mark
83 * it as dirty for later flushing when mapped in user space (if executable,
84 * see __sync_icache_dcache).
85 */
86 void flush_dcache_page(struct page *page)
87 {
88 if (test_bit(PG_dcache_clean, &page->flags))
89 clear_bit(PG_dcache_clean, &page->flags);
90 }
91 EXPORT_SYMBOL(flush_dcache_page);
92
93 /*
94 * Additional functions defined in assembly.
95 */
96 EXPORT_SYMBOL(flush_icache_range);
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