[ARM] copypage: convert assembly files to C

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

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 0000000..1849110
--- /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,
+};