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,
66 memcpy(dst, src, len);
67 flush_ptrace_access(vma, page, uaddr, dst, len);
73 void __sync_icache_dcache(pte_t pte, unsigned long addr)
75 struct page *page = pte_page(pte);
77 /* no flushing needed for anonymous pages */
78 if (!page_mapping(page))
81 if (!test_and_set_bit(PG_dcache_clean, &page->flags)) {
82 __flush_dcache_area(page_address(page),
83 PAGE_SIZE << compound_order(page));
85 } else if (icache_is_aivivt()) {
91 * This function is called when a page has been modified by the kernel. Mark
92 * it as dirty for later flushing when mapped in user space (if executable,
93 * see __sync_icache_dcache).
95 void flush_dcache_page(struct page *page)
97 if (test_bit(PG_dcache_clean, &page->flags))
98 clear_bit(PG_dcache_clean, &page->flags);
100 EXPORT_SYMBOL(flush_dcache_page);
103 * Additional functions defined in assembly.
105 EXPORT_SYMBOL(flush_cache_all);
106 EXPORT_SYMBOL(flush_icache_range);
108 #ifdef CONFIG_TRANSPARENT_HUGEPAGE
109 #ifdef CONFIG_HAVE_RCU_TABLE_FREE
110 void pmdp_splitting_flush(struct vm_area_struct *vma, unsigned long address,
113 pmd_t pmd = pmd_mksplitting(*pmdp);
115 VM_BUG_ON(address & ~PMD_MASK);
116 set_pmd_at(vma->vm_mm, address, pmdp, pmd);
118 /* dummy IPI to serialise against fast_gup */
119 kick_all_cpus_sync();
121 #endif /* CONFIG_HAVE_RCU_TABLE_FREE */
122 #endif /* CONFIG_TRANSPARENT_HUGEPAGE */