1 files changed, 65 insertions, 0 deletions

diff --git a/arch/ppc64/kernel/vdso32/cacheflush.S b/arch/ppc64/kernel/vdso32/cacheflush.S
new file mode 100644
index 000000000000..c74fddb6afd4
--- /dev/null
+++ b/arch/ppc64/kernel/vdso32/cacheflush.S
@@ -0,0 +1,65 @@
+/*
+ * vDSO provided cache flush routines
+ *
+ * Copyright (C) 2004 Benjamin Herrenschmuidt (benh@kernel.crashing.org),
+ *                    IBM Corp.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#include <linux/config.h>
+#include <asm/processor.h>
+#include <asm/ppc_asm.h>
+#include <asm/vdso.h>
+#include <asm/offsets.h>
+
+        .text
+
+/*
+ * Default "generic" version of __kernel_sync_dicache.
+ *
+ * void __kernel_sync_dicache(unsigned long start, unsigned long end)
+ *
+ * Flushes the data cache & invalidate the instruction cache for the
+ * provided range [start, end[
+ *
+ * Note: all CPUs supported by this kernel have a 128 bytes cache
+ * line size so we don't have to peek that info from the datapage
+ */
+V_FUNCTION_BEGIN(__kernel_sync_dicache)
+  .cfi_startproc
+        li      r5,127
+        andc    r6,r3,r5                /* round low to line bdy */
+        subf    r8,r6,r4                /* compute length */
+        add     r8,r8,r5                /* ensure we get enough */
+        srwi.   r8,r8,7                 /* compute line count */
+        beqlr                           /* nothing to do? */
+        mtctr   r8
+        mr      r3,r6
+1:      dcbst   0,r3
+        addi    r3,r3,128
+        bdnz    1b
+        sync
+        mtctr   r8
+1:      icbi    0,r6
+        addi    r6,r6,128
+        bdnz    1b
+        isync
+        blr
+  .cfi_endproc
+V_FUNCTION_END(__kernel_sync_dicache)
+
+
+/*
+ * POWER5 version of __kernel_sync_dicache
+ */
+V_FUNCTION_BEGIN(__kernel_sync_dicache_p5)
+  .cfi_startproc
+        sync
+        isync
+        blr
+  .cfi_endproc
+V_FUNCTION_END(__kernel_sync_dicache_p5)
+