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Diffstat (limited to 'arch/arm/mm/copypage-v3.c')
-rw-r--r--arch/arm/mm/copypage-v3.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/arch/arm/mm/copypage-v3.c b/arch/arm/mm/copypage-v3.c
new file mode 100644
index 00000000000..184911089e6
--- /dev/null
+++ b/arch/arm/mm/copypage-v3.c
@@ -0,0 +1,69 @@
+/*
+ * 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 <asm/page.h>
+
+/*
+ * ARMv3 optimised copy_user_page
+ *
+ * FIXME: do we need to handle cache stuff...
+ */
+void __attribute__((naked))
+v3_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
+{
+ 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));
+}
+
+/*
+ * ARMv3 optimised clear_user_page
+ *
+ * FIXME: do we need to handle cache stuff...
+ */
+void __attribute__((naked)) v3_clear_user_page(void *kaddr, unsigned long vaddr)
+{
+ asm("\n\
+ str lr, [sp, #-4]!\n\
+ mov r1, %1 @ 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\n\
+ ldr pc, [sp], #4"
+ :
+ : "r" (kaddr), "I" (PAGE_SIZE / 64));
+}
+
+struct cpu_user_fns v3_user_fns __initdata = {
+ .cpu_clear_user_page = v3_clear_user_page,
+ .cpu_copy_user_page = v3_copy_user_page,
+};