ipmbbridge initial implementation
ipmbbridge gives the ability for openbmc to host ipmb transactions over
smbus
Change-Id: I3744dbef5a6db0b2ff4f2b691e68ca8dc3b1d24b
Signed-off-by: Dawid Frycki <dawid.frycki@intel.com>
Signed-off-by: Ed Tanous <ed.tanous@intel.com>
diff --git a/ipmbutils.cpp b/ipmbutils.cpp
new file mode 100644
index 0000000..d9a440e
--- /dev/null
+++ b/ipmbutils.cpp
@@ -0,0 +1,90 @@
+/* Copyright 2018 Intel
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "ipmbbridged.hpp"
+#include "ipmbdefines.hpp"
+
+#include <inttypes.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+/**
+ * @brief Ipmb utils for checksum
+ */
+bool ipmbChecksumValidate(uint8_t *data, uint8_t length)
+{
+ uint8_t checksum = 0;
+
+ // compute checksum.
+ for (uint8_t idx = 0; idx < length; idx++)
+ {
+ checksum += data[idx];
+ }
+
+ // check if checksum is valid.
+ if (0 == checksum)
+ {
+ // checksum valid.
+ return true;
+ }
+ else
+ {
+ // checksum invalid.
+ return false;
+ }
+}
+
+uint8_t ipmbChecksumCompute(uint8_t *data, uint8_t length)
+{
+ uint8_t checksum = 0;
+
+ // compute checksum.
+ for (uint8_t idx = 0; idx < length; idx++)
+ {
+ checksum += data[idx];
+ }
+
+ checksum = (~checksum) + 1;
+
+ // return computed checksum value.
+ return checksum;
+}
+
+inline bool ipmbConnectionHeaderChecksumValidate(IPMB_HEADER *ipmbHeader)
+{
+ return ipmbChecksumValidate(reinterpret_cast<uint8_t *>(ipmbHeader),
+ ipmbConnectionHeaderLength);
+}
+
+inline bool ipmbDataChecksumValidate(IPMB_HEADER *ipmbHeader, uint8_t length)
+{
+ return ipmbChecksumValidate(
+ (reinterpret_cast<uint8_t *>(ipmbHeader) + ipmbConnectionHeaderLength),
+ (length - ipmbConnectionHeaderLength));
+}
+
+bool isFrameValid(IPMB_HEADER *frame, uint8_t length)
+{
+ bool frameValid = ipmbConnectionHeaderChecksumValidate(frame);
+ if (false == frameValid)
+ {
+ // invalid connection header checksum.
+ return false;
+ }
+
+ // data checksum validation.
+ return ipmbDataChecksumValidate(frame, length);
+}