1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3 * Copyright (C) 2012 ARM Ltd.
4 */
5
6 #include <linux/linkage.h>
7 #include <linux/const.h>
8 #include <asm/assembler.h>
9 #include <asm/page.h>
10
11 /*
12 * Clear page @dest
13 *
14 * Parameters:
15 * x0 - dest
16 */
17 SYM_FUNC_START(__pi_clear_page)
18 mrs x1, dczid_el0
19 tbnz x1, #4, 2f /* Branch if D
20 and w1, w1, #0xf
21 mov x2, #4
22 lsl x1, x2, x1
23
24 1: dc zva, x0
25 add x0, x0, x1
26 tst x0, #(PAGE_SIZE - 1)
27 b.ne 1b
28 ret
29
30 2: stnp xzr, xzr, [x0]
31 stnp xzr, xzr, [x0, #16]
32 stnp xzr, xzr, [x0, #32]
33 stnp xzr, xzr, [x0, #48]
34 add x0, x0, #64
35 tst x0, #(PAGE_SIZE - 1)
36 b.ne 2b
37 ret
38 SYM_FUNC_END(__pi_clear_page)
39 SYM_FUNC_ALIAS(clear_page, __pi_clear_page)
40 EXPORT_SYMBOL(clear_page)
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