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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
| commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
| tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/arm64/lib/clear_page.S | |
| parent | Initial commit. (diff) | |
| download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip | |
Adding upstream version 6.1.76.upstream/6.1.76
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm64/lib/clear_page.S')
| -rw-r--r-- | arch/arm64/lib/clear_page.S | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/arm64/lib/clear_page.S b/arch/arm64/lib/clear_page.S new file mode 100644 index 000000000..ebde40e7f --- /dev/null +++ b/arch/arm64/lib/clear_page.S @@ -0,0 +1,40 @@ +/* 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 + tbnz x1, #4, 2f /* Branch if DC ZVA is prohibited */ + 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 + +2: stnp xzr, xzr, [x0] + stnp xzr, xzr, [x0, #16] + stnp xzr, xzr, [x0, #32] + stnp xzr, xzr, [x0, #48] + add x0, x0, #64 + tst x0, #(PAGE_SIZE - 1) + b.ne 2b + ret +SYM_FUNC_END(__pi_clear_page) +SYM_FUNC_ALIAS(clear_page, __pi_clear_page) +EXPORT_SYMBOL(clear_page) |