1 files changed, 94 insertions, 0 deletions

diff --git a/arch/arm/mm/copypage-v4wb.c b/arch/arm/mm/copypage-v4wb.c
new file mode 100644
index 000000000000..3ec93dab7656
--- /dev/null
+++ b/arch/arm/mm/copypage-v4wb.c
@@ -0,0 +1,94 @@
+/*
+ *  linux/arch/arm/mm/copypage-v4wb.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>
+
+/*
+ * ARMv4 optimised copy_user_highpage
+ *
+ * We flush the destination cache lines just before we write the data into the
+ * corresponding address.  Since the Dcache is read-allocate, this removes the
+ * Dcache aliasing issue.  The writes will be forwarded to the write buffer,
+ * and merged as appropriate.
+ *
+ * Note: We rely on all ARMv4 processors implementing the "invalidate D line"
+ * instruction.  If your processor does not supply this, you have to write your
+ * own copy_user_highpage that does the right thing.
+ */
+static void __attribute__((naked))
+v4wb_copy_user_page(void *kto, const void *kfrom)
+{
+        asm("\
+        stmfd   sp!, {r4, lr}                   @ 2\n\
+        mov     r2, %0                          @ 1\n\
+        ldmia   r1!, {r3, r4, ip, lr}           @ 4\n\
+1:      mcr     p15, 0, r0, c7, c6, 1           @ 1   invalidate D line\n\
+        stmia   r0!, {r3, r4, ip, lr}           @ 4\n\
+        ldmia   r1!, {r3, r4, ip, lr}           @ 4+1\n\
+        stmia   r0!, {r3, r4, ip, lr}           @ 4\n\
+        ldmia   r1!, {r3, r4, ip, lr}           @ 4\n\
+        mcr     p15, 0, r0, c7, c6, 1           @ 1   invalidate D line\n\
+        stmia   r0!, {r3, r4, ip, lr}           @ 4\n\
+        ldmia   r1!, {r3, r4, ip, lr}           @ 4\n\
+        subs    r2, r2, #1                      @ 1\n\
+        stmia   r0!, {r3, r4, ip, lr}           @ 4\n\
+        ldmneia r1!, {r3, r4, ip, lr}           @ 4\n\
+        bne     1b                              @ 1\n\
+        mcr     p15, 0, r1, c7, c10, 4          @ 1   drain WB\n\
+        ldmfd    sp!, {r4, pc}                  @ 3"
+        :
+        : "I" (PAGE_SIZE / 64));
+}
+
+void v4wb_copy_user_highpage(struct page *to, struct page *from,
+        unsigned long vaddr)
+{
+        void *kto, *kfrom;
+
+        kto = kmap_atomic(to, KM_USER0);
+        kfrom = kmap_atomic(from, KM_USER1);
+        v4wb_copy_user_page(kto, kfrom);
+        kunmap_atomic(kfrom, KM_USER1);
+        kunmap_atomic(kto, KM_USER0);
+}
+
+/*
+ * ARMv4 optimised clear_user_page
+ *
+ * Same story as above.
+ */
+void v4wb_clear_user_highpage(struct page *page, unsigned long vaddr)
+{
+        void *ptr, *kaddr = kmap_atomic(page, KM_USER0);
+        asm volatile("\
+        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:      mcr     p15, 0, %0, c7, c6, 1           @ 1   invalidate D line\n\
+        stmia   %0!, {r2, r3, ip, lr}           @ 4\n\
+        stmia   %0!, {r2, r3, ip, lr}           @ 4\n\
+        mcr     p15, 0, %0, c7, c6, 1           @ 1   invalidate D line\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\
+        mcr     p15, 0, r1, c7, c10, 4          @ 1   drain WB"
+        : "=r" (ptr)
+        : "0" (kaddr), "I" (PAGE_SIZE / 64)
+        : "r1", "r2", "r3", "ip", "lr");
+        kunmap_atomic(kaddr, KM_USER0);
+}
+
+struct cpu_user_fns v4wb_user_fns __initdata = {
+        .cpu_clear_user_highpage = v4wb_clear_user_highpage,
+        .cpu_copy_user_highpage = v4wb_copy_user_highpage,
+};