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 /* 37 * Don't issue kick_all_cpus_sync() after I-cache invalidation 38 * for user mappings. 39 */ 40 __flush_icache_range(addr, addr + len); 41 } 42 } 43 44 static void flush_ptrace_access(struct vm_area_struct *vma, struct page *page, 45 unsigned long uaddr, void *kaddr, 46 unsigned long len) 47 { 48 if (vma->vm_flags & VM_EXEC) 49 sync_icache_aliases(kaddr, len); 50 } 51 52 /* 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 55 * this. 56 */ 57 void copy_to_user_page(struct vm_area_struct *vma, struct page *page, 58 unsigned long uaddr, void *dst, const void *src, 59 unsigned long len) 60 { 61 memcpy(dst, src, len); 62 flush_ptrace_access(vma, page, uaddr, dst, len); 63 } 64 65 void __sync_icache_dcache(pte_t pte) 66 { 67 struct page *page = pte_page(pte); 68 69 if (!test_and_set_bit(PG_dcache_clean, &page->flags)) 70 sync_icache_aliases(page_address(page), 71 PAGE_SIZE << compound_order(page)); 72 } 73 EXPORT_SYMBOL_GPL(__sync_icache_dcache); 74 75 /* 76 * This function is called when a page has been modified by the kernel. Mark 77 * it as dirty for later flushing when mapped in user space (if executable, 78 * see __sync_icache_dcache). 79 */ 80 void flush_dcache_page(struct page *page) 81 { 82 if (test_bit(PG_dcache_clean, &page->flags)) 83 clear_bit(PG_dcache_clean, &page->flags); 84 } 85 EXPORT_SYMBOL(flush_dcache_page); 86 87 /* 88 * Additional functions defined in assembly. 89 */ 90 EXPORT_SYMBOL(__flush_icache_range); 91 92 #ifdef CONFIG_ARCH_HAS_PMEM_API 93 void arch_wb_cache_pmem(void *addr, size_t size) 94 { 95 /* Ensure order against any prior non-cacheable writes */ 96 dmb(osh); 97 __clean_dcache_area_pop(addr, size); 98 } 99 EXPORT_SYMBOL_GPL(arch_wb_cache_pmem); 100 101 void arch_invalidate_pmem(void *addr, size_t size) 102 { 103 __inval_dcache_area(addr, size); 104 } 105 EXPORT_SYMBOL_GPL(arch_invalidate_pmem); 106 #endif 107