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-rw-r--r--kernel/arch/arm64/lib/copy_page.S46
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
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+++ b/kernel/arch/arm64/lib/copy_page.S
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+/*
+ * 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)