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/cache.h>
26 #include <asm/tlbflush.h>
27
sync_icache_aliases(void * kaddr,unsigned long len)28 void sync_icache_aliases(void *kaddr, unsigned long len)
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
flush_ptrace_access(struct vm_area_struct * vma,struct page * page,unsigned long uaddr,void * kaddr,unsigned long len)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 {
44 if (vma->vm_flags & VM_EXEC)
45 sync_icache_aliases(kaddr, len);
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.
52 */
copy_to_user_page(struct vm_area_struct * vma,struct page * page,unsigned long uaddr,void * dst,const void * src,unsigned long len)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 {
57 memcpy(dst, src, len);
58 flush_ptrace_access(vma, page, uaddr, dst, len);
59 }
60
__sync_icache_dcache(pte_t pte)61 void __sync_icache_dcache(pte_t pte)
62 {
63 struct page *page = pte_page(pte);
64
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 }
69 EXPORT_SYMBOL_GPL(__sync_icache_dcache);
70
71 /*
72 * This function is called when a page has been modified by the kernel. Mark
73 * it as dirty for later flushing when mapped in user space (if executable,
74 * see __sync_icache_dcache).
75 */
flush_dcache_page(struct page * page)76 void flush_dcache_page(struct page *page)
77 {
78 if (test_bit(PG_dcache_clean, &page->flags))
79 clear_bit(PG_dcache_clean, &page->flags);
80 }
81 EXPORT_SYMBOL(flush_dcache_page);
82
83 /*
84 * Additional functions defined in assembly.
85 */
86 EXPORT_SYMBOL(__flush_icache_range);
87
88 #ifdef CONFIG_ARCH_HAS_PMEM_API
arch_wb_cache_pmem(void * addr,size_t size)89 void arch_wb_cache_pmem(void *addr, size_t size)
90 {
91 /* Ensure order against any prior non-cacheable writes */
92 dmb(osh);
93 __clean_dcache_area_pop(addr, size);
94 }
95 EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
96
arch_invalidate_pmem(void * addr,size_t size)97 void arch_invalidate_pmem(void *addr, size_t size)
98 {
99 __inval_dcache_area(addr, size);
100 }
101 EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
102 #endif
103
