[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 000000000000..184911089e6c
--- /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,
+};