summaryrefslogtreecommitdiff
path: root/arch/arm64/lib/clear_page.S
blob: b84b179edba3a62c8b513ed133157fd1e669cfaf (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) 2012 ARM Ltd.
 */

#include <linux/linkage.h>
#include <linux/const.h>
#include <asm/assembler.h>
#include <asm/page.h>

/*
 * Clear page @dest
 *
 * Parameters:
 *	x0 - dest
 */
SYM_FUNC_START_PI(clear_page)
	mrs	x1, dczid_el0
	and	w1, w1, #0xf
	mov	x2, #4
	lsl	x1, x2, x1

1:	dc	zva, x0
	add	x0, x0, x1
	tst	x0, #(PAGE_SIZE - 1)
	b.ne	1b
	ret
SYM_FUNC_END_PI(clear_page)
EXPORT_SYMBOL(clear_page)