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authorStephen Rothwell <sfr@canb.auug.org.au>2008-08-01 09:20:30 +0400
committerPaul Mackerras <paulus@samba.org>2008-08-04 06:02:00 +0400
commitb8b572e1015f81b4e748417be2629dfe51ab99f9 (patch)
tree7df58667d5ed71d6c8f8f4ce40ca16b6fb776d0b /arch/powerpc/include/asm/edac.h
parent2b12a4c524812fb3f6ee590a02e65b95c8c32229 (diff)
downloadlinux-b8b572e1015f81b4e748417be2629dfe51ab99f9.tar.xz
powerpc: Move include files to arch/powerpc/include/asm
from include/asm-powerpc. This is the result of a mkdir arch/powerpc/include/asm git mv include/asm-powerpc/* arch/powerpc/include/asm Followed by a few documentation/comment fixups and a couple of places where <asm-powepc/...> was being used explicitly. Of the latter only one was outside the arch code and it is a driver only built for powerpc. Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'arch/powerpc/include/asm/edac.h')
-rw-r--r--arch/powerpc/include/asm/edac.h40
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/edac.h b/arch/powerpc/include/asm/edac.h
new file mode 100644
index 000000000000..6ead88bbfbb8
--- /dev/null
+++ b/arch/powerpc/include/asm/edac.h
@@ -0,0 +1,40 @@
+/*
+ * PPC EDAC common defs
+ *
+ * Author: Dave Jiang <djiang@mvista.com>
+ *
+ * 2007 (c) MontaVista Software, Inc. This file is licensed under
+ * the terms of the GNU General Public License version 2. This program
+ * is licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ */
+#ifndef ASM_EDAC_H
+#define ASM_EDAC_H
+/*
+ * ECC atomic, DMA, SMP and interrupt safe scrub function.
+ * Implements the per arch atomic_scrub() that EDAC use for software
+ * ECC scrubbing. It reads memory and then writes back the original
+ * value, allowing the hardware to detect and correct memory errors.
+ */
+static __inline__ void atomic_scrub(void *va, u32 size)
+{
+ unsigned int *virt_addr = va;
+ unsigned int temp;
+ unsigned int i;
+
+ for (i = 0; i < size / sizeof(*virt_addr); i++, virt_addr++) {
+ /* Very carefully read and write to memory atomically
+ * so we are interrupt, DMA and SMP safe.
+ */
+ __asm__ __volatile__ ("\n\
+ 1: lwarx %0,0,%1\n\
+ stwcx. %0,0,%1\n\
+ bne- 1b\n\
+ isync"
+ : "=&r"(temp)
+ : "r"(virt_addr)
+ : "cr0", "memory");
+ }
+}
+
+#endif