[ARM] copypage: convert assembly files to C

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

1 files changed, 102 insertions, 0 deletions

diff --git a/arch/arm/mm/copypage-xsc3.c b/arch/arm/mm/copypage-xsc3.c
new file mode 100644
index 000000000000..51ed502e5777
--- /dev/null
+++ b/arch/arm/mm/copypage-xsc3.c
@@ -0,0 +1,102 @@
+/*
+ *  linux/arch/arm/mm/copypage-xsc3.S
+ *
+ *  Copyright (C) 2004 Intel Corp.
+ *
+ * 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.
+ *
+ * Adapted for 3rd gen XScale core, no more mini-dcache
+ * Author: Matt Gilbert (matthew.m.gilbert@intel.com)
+ */
+#include <linux/init.h>
+
+#include <asm/page.h>
+
+/*
+ * General note:
+ *  We don't really want write-allocate cache behaviour for these functions
+ *  since that will just eat through 8K of the cache.
+ */
+
+/*
+ * XSC3 optimised copy_user_page
+ *  r0 = destination
+ *  r1 = source
+ *  r2 = virtual user address of ultimate destination page
+ *
+ * The source page may have some clean entries in the cache already, but we
+ * can safely ignore them - break_cow() will flush them out of the cache
+ * if we eventually end up using our copied page.
+ *
+ */
+void __attribute__((naked))
+xsc3_mc_copy_user_page(void *kto, const void *kfrom, unsigned long vaddr)
+{
+        asm("\
+        stmfd   sp!, {r4, r5, lr}               \n\
+        mov     lr, %0                          \n\
+                                                \n\
+        pld     [r1, #0]                        \n\
+        pld     [r1, #32]                       \n\
+1:      pld     [r1, #64]                       \n\
+        pld     [r1, #96]                       \n\
+                                                \n\
+2:      ldrd    r2, [r1], #8                    \n\
+        mov     ip, r0                          \n\
+        ldrd    r4, [r1], #8                    \n\
+        mcr     p15, 0, ip, c7, c6, 1           @ invalidate\n\
+        strd    r2, [r0], #8                    \n\
+        ldrd    r2, [r1], #8                    \n\
+        strd    r4, [r0], #8                    \n\
+        ldrd    r4, [r1], #8                    \n\
+        strd    r2, [r0], #8                    \n\
+        strd    r4, [r0], #8                    \n\
+        ldrd    r2, [r1], #8                    \n\
+        mov     ip, r0                          \n\
+        ldrd    r4, [r1], #8                    \n\
+        mcr     p15, 0, ip, c7, c6, 1           @ invalidate\n\
+        strd    r2, [r0], #8                    \n\
+        ldrd    r2, [r1], #8                    \n\
+        subs    lr, lr, #1                      \n\
+        strd    r4, [r0], #8                    \n\
+        ldrd    r4, [r1], #8                    \n\
+        strd    r2, [r0], #8                    \n\
+        strd    r4, [r0], #8                    \n\
+        bgt     1b                              \n\
+        beq     2b                              \n\
+                                                \n\
+        ldmfd   sp!, {r4, r5, pc}"
+        :
+        : "I" (PAGE_SIZE / 64 - 1));
+}
+
+/*
+ * XScale optimised clear_user_page
+ *  r0 = destination
+ *  r1 = virtual user address of ultimate destination page
+ */
+void __attribute__((naked))
+xsc3_mc_clear_user_page(void *kaddr, unsigned long vaddr)
+{
+        asm("\
+        mov     r1, %0                          \n\
+        mov     r2, #0                          \n\
+        mov     r3, #0                          \n\
+1:      mcr     p15, 0, r0, c7, c6, 1           @ invalidate line\n\
+        strd    r2, [r0], #8                    \n\
+        strd    r2, [r0], #8                    \n\
+        strd    r2, [r0], #8                    \n\
+        strd    r2, [r0], #8                    \n\
+        subs    r1, r1, #1                      \n\
+        bne     1b                              \n\
+        mov     pc, lr"
+        :
+        : "I" (PAGE_SIZE / 32));
+}
+
+struct cpu_user_fns xsc3_mc_user_fns __initdata = {
+        .cpu_clear_user_page    = xsc3_mc_clear_user_page,
+        .cpu_copy_user_page     = xsc3_mc_copy_user_page,
+};