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author | Marc Zyngier <marc.zyngier@arm.com> | 2012-03-05 11:49:33 (GMT) |
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committer | Catalin Marinas <catalin.marinas@arm.com> | 2012-09-17 12:42:18 (GMT) |
commit | f27bb139c3876806a2c82e979d2dbbece44c66df (patch) | |
tree | b89925966ca77224f0605dc85521a2e55ab89c70 /arch/arm64/lib/clear_page.S | |
parent | 030896885ade0a17c8638e1ede8d3ca7099f0302 (diff) | |
download | linux-f27bb139c3876806a2c82e979d2dbbece44c66df.tar.xz |
arm64: Miscellaneous library functions
This patch adds udelay, memory and bit operations together with the
ksyms exports.
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Olof Johansson <olof@lixom.net>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Diffstat (limited to 'arch/arm64/lib/clear_page.S')
-rw-r--r-- | arch/arm64/lib/clear_page.S | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/arch/arm64/lib/clear_page.S b/arch/arm64/lib/clear_page.S new file mode 100644 index 0000000..ef08e90 --- /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 <http://www.gnu.org/licenses/>. + */ + +#include <linux/linkage.h> +#include <linux/const.h> +#include <asm/assembler.h> +#include <asm/page.h> + +/* + * 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) |