xref: /openbmc/linux/arch/arm64/mm/copypage.c (revision b11e1930)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Based on arch/arm/mm/copypage.c
4  *
5  * Copyright (C) 2002 Deep Blue Solutions Ltd, All Rights Reserved.
6  * Copyright (C) 2012 ARM Ltd.
7  */
8 
9 #include <linux/bitops.h>
10 #include <linux/mm.h>
11 
12 #include <asm/page.h>
13 #include <asm/cacheflush.h>
14 #include <asm/cpufeature.h>
15 #include <asm/mte.h>
16 
17 void copy_highpage(struct page *to, struct page *from)
18 {
19 	void *kto = page_address(to);
20 	void *kfrom = page_address(from);
21 
22 	copy_page(kto, kfrom);
23 
24 	if (system_supports_mte() && page_mte_tagged(from)) {
25 		if (kasan_hw_tags_enabled())
26 			page_kasan_tag_reset(to);
27 		/* It's a new page, shouldn't have been tagged yet */
28 		WARN_ON_ONCE(!try_page_mte_tagging(to));
29 		mte_copy_page_tags(kto, kfrom);
30 		set_page_mte_tagged(to);
31 	}
32 }
33 EXPORT_SYMBOL(copy_highpage);
34 
35 void copy_user_highpage(struct page *to, struct page *from,
36 			unsigned long vaddr, struct vm_area_struct *vma)
37 {
38 	copy_highpage(to, from);
39 	flush_dcache_page(to);
40 }
41 EXPORT_SYMBOL_GPL(copy_user_highpage);
42