diff options
Diffstat (limited to 'kernel/arch/arm64/lib/copy_page.S')
| -rw-r--r-- | kernel/arch/arm64/lib/copy_page.S | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/kernel/arch/arm64/lib/copy_page.S b/kernel/arch/arm64/lib/copy_page.S new file mode 100644 index 000000000..512b9a7b9 --- /dev/null +++ b/kernel/arch/arm64/lib/copy_page.S @@ -0,0 +1,46 @@ +/* + * 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> + +/* + * Copy a page from src to dest (both are page aligned) + * + * Parameters: + * x0 - dest + * x1 - src + */ +ENTRY(copy_page) + /* Assume cache line size is 64 bytes. */ + prfm pldl1strm, [x1, #64] +1: ldp x2, x3, [x1] + ldp x4, x5, [x1, #16] + ldp x6, x7, [x1, #32] + ldp x8, x9, [x1, #48] + add x1, x1, #64 + prfm pldl1strm, [x1, #64] + stnp x2, x3, [x0] + stnp x4, x5, [x0, #16] + stnp x6, x7, [x0, #32] + stnp x8, x9, [x0, #48] + add x0, x0, #64 + tst x1, #(PAGE_SIZE - 1) + b.ne 1b + ret +ENDPROC(copy_page) |