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 void flush_cache_range(struct vm_area_struct *vma, unsigned long start, 29 unsigned long end) 30 { 31 if (vma->vm_flags & VM_EXEC) 32 __flush_icache_all(); 33 } 34 35 static void sync_icache_aliases(void *kaddr, unsigned long len) 36 { 37 unsigned long addr = (unsigned long)kaddr; 38 39 if (icache_is_aliasing()) { 40 __clean_dcache_area_pou(kaddr, len); 41 __flush_icache_all(); 42 } else { 43 flush_icache_range(addr, addr + len); 44 } 45 } 46 47 static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, 48 unsigned long uaddr, void *kaddr, 49 unsigned long len) 50 { 51 if (vma->vm_flags & VM_EXEC) 52 sync_icache_aliases(kaddr, len); 53 } 54 55 /* 56 * Copy user data from/to a page which is mapped into a different processes 57 * address space. Really, we want to allow our "user space" model to handle 58 * this. 59 */ 60 void copy_to_user_page(struct vm_area_struct *vma, struct page *page, 61 unsigned long uaddr, void *dst, const void *src, 62 unsigned long len) 63 { 64 memcpy(dst, src, len); 65 flush_ptrace_access(vma, page, uaddr, dst, len); 66 } 67 68 void __sync_icache_dcache(pte_t pte, unsigned long addr) 69 { 70 struct page *page = pte_page(pte); 71 72 if (!test_and_set_bit(PG_dcache_clean, &page->flags)) 73 sync_icache_aliases(page_address(page), 74 PAGE_SIZE << compound_order(page)); 75 else if (icache_is_aivivt()) 76 __flush_icache_all(); 77 } 78 79 /* 80 * This function is called when a page has been modified by the kernel. Mark 81 * it as dirty for later flushing when mapped in user space (if executable, 82 * see __sync_icache_dcache). 83 */ 84 void flush_dcache_page(struct page *page) 85 { 86 if (test_bit(PG_dcache_clean, &page->flags)) 87 clear_bit(PG_dcache_clean, &page->flags); 88 } 89 EXPORT_SYMBOL(flush_dcache_page); 90 91 /* 92 * Additional functions defined in assembly. 93 */ 94 EXPORT_SYMBOL(flush_icache_range); 95