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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/ppc64/kernel/vdso64/cacheflush.S
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'arch/ppc64/kernel/vdso64/cacheflush.S')
-rw-r--r--arch/ppc64/kernel/vdso64/cacheflush.S64
1 files changed, 64 insertions, 0 deletions
diff --git a/arch/ppc64/kernel/vdso64/cacheflush.S b/arch/ppc64/kernel/vdso64/cacheflush.S
new file mode 100644
index 00000000000..d9696ffcf33
--- /dev/null
+++ b/arch/ppc64/kernel/vdso64/cacheflush.S
@@ -0,0 +1,64 @@
+/*
+ * 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)