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Linux/arch/arm64/mm/flush.c

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  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 
 87 #ifdef CONFIG_ARCH_HAS_PMEM_API
 88 void arch_wb_cache_pmem(void *addr, size_t size)
 89 {
 90         /* Ensure order against any prior non-cacheable writes */
 91         dmb(osh);
 92         __clean_dcache_area_pop(addr, size);
 93 }
 94 EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);
 95 
 96 void arch_invalidate_pmem(void *addr, size_t size)
 97 {
 98         __inval_dcache_area(addr, size);
 99 }
100 EXPORT_SYMBOL_GPL(arch_invalidate_pmem);
101 #endif
102 

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