zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/arch/arm/mm/copypage-v3.c b/ap/os/linux/linux-3.4.x/arch/arm/mm/copypage-v3.c
new file mode 100644
index 0000000..3935bdd
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/arch/arm/mm/copypage-v3.c
@@ -0,0 +1,81 @@
+/*
+ * linux/arch/arm/mm/copypage-v3.c
+ *
+ * Copyright (C) 1995-1999 Russell King
+ *
+ * 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.
+ */
+#include <linux/init.h>
+#include <linux/highmem.h>
+
+/*
+ * ARMv3 optimised copy_user_highpage
+ *
+ * FIXME: do we need to handle cache stuff...
+ */
+static void __naked
+v3_copy_user_page(void *kto, const void *kfrom)
+{
+ asm("\n\
+ stmfd sp!, {r4, lr} @ 2\n\
+ mov r2, %2 @ 1\n\
+ ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\
+1: stmia %1!, {r3, r4, ip, lr} @ 4\n\
+ ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\
+ stmia %1!, {r3, r4, ip, lr} @ 4\n\
+ ldmia %0!, {r3, r4, ip, lr} @ 4+1\n\
+ stmia %1!, {r3, r4, ip, lr} @ 4\n\
+ ldmia %0!, {r3, r4, ip, lr} @ 4\n\
+ subs r2, r2, #1 @ 1\n\
+ stmia %1!, {r3, r4, ip, lr} @ 4\n\
+ ldmneia %0!, {r3, r4, ip, lr} @ 4\n\
+ bne 1b @ 1\n\
+ ldmfd sp!, {r4, pc} @ 3"
+ :
+ : "r" (kfrom), "r" (kto), "I" (PAGE_SIZE / 64));
+}
+
+void v3_copy_user_highpage(struct page *to, struct page *from,
+ unsigned long vaddr, struct vm_area_struct *vma)
+{
+ void *kto, *kfrom;
+
+ kto = kmap_atomic(to);
+ kfrom = kmap_atomic(from);
+ v3_copy_user_page(kto, kfrom);
+ kunmap_atomic(kfrom);
+ kunmap_atomic(kto);
+}
+
+/*
+ * ARMv3 optimised clear_user_page
+ *
+ * FIXME: do we need to handle cache stuff...
+ */
+void v3_clear_user_highpage(struct page *page, unsigned long vaddr)
+{
+ void *ptr, *kaddr = kmap_atomic(page);
+ asm volatile("\n\
+ mov r1, %2 @ 1\n\
+ mov r2, #0 @ 1\n\
+ mov r3, #0 @ 1\n\
+ mov ip, #0 @ 1\n\
+ mov lr, #0 @ 1\n\
+1: stmia %0!, {r2, r3, ip, lr} @ 4\n\
+ stmia %0!, {r2, r3, ip, lr} @ 4\n\
+ stmia %0!, {r2, r3, ip, lr} @ 4\n\
+ stmia %0!, {r2, r3, ip, lr} @ 4\n\
+ subs r1, r1, #1 @ 1\n\
+ bne 1b @ 1"
+ : "=r" (ptr)
+ : "0" (kaddr), "I" (PAGE_SIZE / 64)
+ : "r1", "r2", "r3", "ip", "lr");
+ kunmap_atomic(kaddr);
+}
+
+struct cpu_user_fns v3_user_fns __initdata = {
+ .cpu_clear_user_highpage = v3_clear_user_highpage,
+ .cpu_copy_user_highpage = v3_copy_user_highpage,
+};