From 76cb841cb886eef6b3bee341a2266c76578724ad Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Mon, 6 May 2024 03:02:30 +0200 Subject: Adding upstream version 4.19.249. Signed-off-by: Daniel Baumann --- arch/arm64/lib/clear_page.S | 39 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 arch/arm64/lib/clear_page.S (limited to 'arch/arm64/lib/clear_page.S') diff --git a/arch/arm64/lib/clear_page.S b/arch/arm64/lib/clear_page.S new file mode 100644 index 000000000..ef08e905e --- /dev/null +++ b/arch/arm64/lib/clear_page.S @@ -0,0 +1,39 @@ +/* + * Copyright (C) 2012 ARM Ltd. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include +#include +#include +#include + +/* + * Clear page @dest + * + * Parameters: + * x0 - dest + */ +ENTRY(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 +ENDPROC(clear_page) -- cgit v1.2.3