Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=723ec731de880a76a004a304b62bf8d0f96435d8
Commit:     723ec731de880a76a004a304b62bf8d0f96435d8
Parent:     27565903e94d548256bf5923653ab2a9668c9b9f
Author:     Dave Jiang <[EMAIL PROTECTED]>
AuthorDate: Fri Mar 2 13:36:21 2007 -0700
Committer:  Paul Mackerras <[EMAIL PROTECTED]>
CommitDate: Fri Mar 9 15:03:25 2007 +1100

    [POWERPC] EDAC ECC software scrubber
    
    Implements the per arch atomic_scrub() that EDAC uses for software
    ECC scrubbing.  It reads memory and then writes back the original
    value, allowing the hardware to detect and correct memory errors.
    
    Signed-off-by: Dave Jiang <[EMAIL PROTECTED]>
    Signed-off-by: Paul Mackerras <[EMAIL PROTECTED]>
---
 include/asm-powerpc/edac.h |   40 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 40 insertions(+), 0 deletions(-)

diff --git a/include/asm-powerpc/edac.h b/include/asm-powerpc/edac.h
new file mode 100644
index 0000000..6ead88b
--- /dev/null
+++ b/include/asm-powerpc/edac.h
@@ -0,0 +1,40 @@
+/*
+ * PPC EDAC common defs
+ *
+ * Author: Dave Jiang <[EMAIL PROTECTED]>
+ *
+ * 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
-
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