msg: handle partition table read request
Map host's request to read the flash at offset less than the partition
table length as a request to read the pnor partition table.
Resolves openbmc/openbmc#1439.
Change-Id: I0f5b98f073d983b0d4749b0aba84b37d7f42f884
Signed-off-by: Deepak Kodihalli <dkodihal@in.ibm.com>
diff --git a/mboxd_flash_virtual.cpp b/mboxd_flash_virtual.cpp
new file mode 100644
index 0000000..9aed5fd
--- /dev/null
+++ b/mboxd_flash_virtual.cpp
@@ -0,0 +1,64 @@
+/*
+ * Mailbox Daemon Window Helpers
+ *
+ * Copyright 2017 IBM
+ *
+ * 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 <stdint.h>
+#include <stdlib.h>
+#include <syslog.h>
+
+extern "C" {
+#include "common.h"
+}
+
+#include "mboxd_flash.h"
+#include "mboxd_pnor_partition_table.h"
+
+/*
+ * copy_flash() - Copy data from the virtual pnor into a provided buffer
+ * @context: The mbox context pointer
+ * @offset: The pnor offset to copy from (bytes)
+ * @mem: The buffer to copy into (must be of atleast 'size' bytes)
+ * @size: The number of bytes to copy
+ *
+ * Return: 0 on success otherwise negative error code
+ */
+int copy_flash(struct mbox_context* context, uint32_t offset, void* mem,
+ uint32_t size)
+{
+ int rc = 0;
+
+ MSG_DBG("Copy virtual pnor to %p for size 0x%.8x from offset 0x%.8x\n",
+ mem, size, offset);
+
+ /* The virtual PNOR partition table starts at offset 0 in the virtual
+ * pnor image. Check if host asked for an offset that lies within the
+ * partition table.
+ */
+ size_t sz =
+ vpnor_get_partition_table_size(context) << context->block_size_shift;
+ if (offset < sz)
+ {
+ const struct pnor_partition_table* table =
+ vpnor_get_partition_table(context);
+ memcpy(mem,
+ ((uint8_t*)table) + offset,
+ min_u32(sz - offset, size));
+ }
+
+ return rc;
+}