2 * Based on arch/arm/mm/flush.c
4 * Copyright (C) 1995-2002 Russell King
5 * Copyright (C) 2012 ARM Ltd.
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.
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.
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/>.
20 #include <linux/export.h>
22 #include <linux/pagemap.h>
24 #include <asm/cacheflush.h>
25 #include <asm/cachetype.h>
26 #include <asm/tlbflush.h>
30 void flush_cache_range(struct vm_area_struct
*vma
, unsigned long start
,
33 if (vma
->vm_flags
& VM_EXEC
)
37 static void flush_ptrace_access(struct vm_area_struct
*vma
, struct page
*page
,
38 unsigned long uaddr
, void *kaddr
,
41 if (vma
->vm_flags
& VM_EXEC
) {
42 unsigned long addr
= (unsigned long)kaddr
;
43 if (icache_is_aliasing()) {
44 __flush_dcache_area(kaddr
, len
);
47 flush_icache_range(addr
, addr
+ len
);
53 * Copy user data from/to a page which is mapped into a different processes
54 * address space. Really, we want to allow our "user space" model to handle
57 * Note that this code needs to run on the current CPU.
59 void copy_to_user_page(struct vm_area_struct
*vma
, struct page
*page
,
60 unsigned long uaddr
, void *dst
, const void *src
,
64 memcpy(dst
, src
, len
);
65 flush_ptrace_access(vma
, page
, uaddr
, dst
, len
);
69 void __sync_icache_dcache(pte_t pte
, unsigned long addr
)
71 struct page
*page
= pte_page(pte
);
73 /* no flushing needed for anonymous pages */
74 if (!page_mapping(page
))
77 if (!test_and_set_bit(PG_dcache_clean
, &page
->flags
)) {
78 __flush_dcache_area(page_address(page
),
79 PAGE_SIZE
<< compound_order(page
));
81 } else if (icache_is_aivivt()) {
87 * This function is called when a page has been modified by the kernel. Mark
88 * it as dirty for later flushing when mapped in user space (if executable,
89 * see __sync_icache_dcache).
91 void flush_dcache_page(struct page
*page
)
93 if (test_bit(PG_dcache_clean
, &page
->flags
))
94 clear_bit(PG_dcache_clean
, &page
->flags
);
96 EXPORT_SYMBOL(flush_dcache_page
);
99 * Additional functions defined in assembly.
101 EXPORT_SYMBOL(flush_icache_range
);
103 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
104 #ifdef CONFIG_HAVE_RCU_TABLE_FREE
105 void pmdp_splitting_flush(struct vm_area_struct
*vma
, unsigned long address
,
108 pmd_t pmd
= pmd_mksplitting(*pmdp
);
110 VM_BUG_ON(address
& ~PMD_MASK
);
111 set_pmd_at(vma
->vm_mm
, address
, pmdp
, pmd
);
113 /* dummy IPI to serialise against fast_gup */
114 kick_all_cpus_sync();
116 #endif /* CONFIG_HAVE_RCU_TABLE_FREE */
117 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */