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 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 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 */ 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 61 void __sync_icache_dcache(pte_t pte, unsigned long addr) 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 70 /* 71 * This function is called when a page has been modified by the kernel. Mark 72 * it as dirty for later flushing when mapped in user space (if executable, 73 * see __sync_icache_dcache). 74 */ 75 void flush_dcache_page(struct page *page) 76 { 77 if (test_bit(PG_dcache_clean, &page->flags)) 78 clear_bit(PG_dcache_clean, &page->flags); 79 } 80 EXPORT_SYMBOL(flush_dcache_page); 81 82 /* 83 * Additional functions defined in assembly. 84 */ 85 EXPORT_SYMBOL(flush_icache_range); 86