Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / arch / arm / mm / copypage-fa.c

diff --git a/kernel/arch/arm/mm/copypage-fa.c b/kernel/arch/arm/mm/copypage-fa.c
new file mode 100644 (file)
index 0000000..d130a5e
--- /dev/null
+++ b/kernel/arch/arm/mm/copypage-fa.c
@@ -0,0 +1,86 @@
+/*
+ *  linux/arch/arm/lib/copypage-fa.S
+ *
+ *  Copyright (C) 2005 Faraday Corp.
+ *  Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
+ *
+ * Based on copypage-v4wb.S:
+ *  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>
+
+/*
+ * Faraday optimised copy_user_page
+ */
+static void __naked
+fa_copy_user_page(void *kto, const void *kfrom)
+{
+       asm("\
+       stmfd   sp!, {r4, lr}                   @ 2\n\
+       mov     r2, %0                          @ 1\n\
+1:     ldmia   r1!, {r3, r4, ip, lr}           @ 4\n\
+       stmia   r0, {r3, r4, ip, lr}            @ 4\n\
+       mcr     p15, 0, r0, c7, c14, 1          @ 1   clean and invalidate D line\n\
+       add     r0, r0, #16                     @ 1\n\
+       ldmia   r1!, {r3, r4, ip, lr}           @ 4\n\
+       stmia   r0, {r3, r4, ip, lr}            @ 4\n\
+       mcr     p15, 0, r0, c7, c14, 1          @ 1   clean and invalidate D line\n\
+       add     r0, r0, #16                     @ 1\n\
+       subs    r2, r2, #1                      @ 1\n\
+       bne     1b                              @ 1\n\
+       mcr     p15, 0, r2, c7, c10, 4          @ 1   drain WB\n\
+       ldmfd   sp!, {r4, pc}                   @ 3"
+       :
+       : "I" (PAGE_SIZE / 32));
+}
+
+void fa_copy_user_highpage(struct page *to, struct page *from,
+       unsigned long vaddr, struct vm_area_struct *vma)
+{
+       void *kto, *kfrom;
+
+       kto = kmap_atomic(to);
+       kfrom = kmap_atomic(from);
+       fa_copy_user_page(kto, kfrom);
+       kunmap_atomic(kfrom);
+       kunmap_atomic(kto);
+}
+
+/*
+ * Faraday optimised clear_user_page
+ *
+ * Same story as above.
+ */
+void fa_clear_user_highpage(struct page *page, unsigned long vaddr)
+{
+       void *ptr, *kaddr = kmap_atomic(page);
+       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:     stmia   %0, {r2, r3, ip, lr}            @ 4\n\
+       mcr     p15, 0, %0, c7, c14, 1          @ 1   clean and invalidate D line\n\
+       add     %0, %0, #16                     @ 1\n\
+       stmia   %0, {r2, r3, ip, lr}            @ 4\n\
+       mcr     p15, 0, %0, c7, c14, 1          @ 1   clean and invalidate D line\n\
+       add     %0, %0, #16                     @ 1\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 / 32)
+       : "r1", "r2", "r3", "ip", "lr");
+       kunmap_atomic(kaddr);
+}
+
+struct cpu_user_fns fa_user_fns __initdata = {
+       .cpu_clear_user_highpage = fa_clear_user_highpage,
+       .cpu_copy_user_highpage = fa_copy_user_highpage,
+};