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_physical.c b/mboxd_flash_physical.c
new file mode 100644
index 0000000..92c70e7
--- /dev/null
+++ b/mboxd_flash_physical.c
@@ -0,0 +1,71 @@
+/*
+ * Mailbox Daemon Flash 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.
+ *
+ */
+
+#define _GNU_SOURCE
+#include <stdint.h>
+#include <stdlib.h>
+#include <syslog.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <errno.h>
+#include <mtd/mtd-abi.h>
+
+#include "mbox.h"
+#include "common.h"
+#include "mboxd_flash.h"
+
+#define CHUNKSIZE (64 * 1024)
+
+/*
+ * copy_flash() - Copy data from the flash device into a provided buffer
+ * @context: The mbox context pointer
+ * @offset: The flash 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)
+{
+ int32_t size_read;
+
+ MSG_DBG("Copy flash to %p for size 0x%.8x from offset 0x%.8x\n",
+ mem, size, offset);
+ if (lseek(context->fds[MTD_FD].fd, offset, SEEK_SET) != offset) {
+ MSG_ERR("Couldn't seek flash at pos: %u %s\n", offset,
+ strerror(errno));
+ return -MBOX_R_SYSTEM_ERROR;
+ }
+
+ do {
+ size_read = read(context->fds[MTD_FD].fd, mem,
+ min_u32(CHUNKSIZE, size));
+ if (size_read < 0) {
+ MSG_ERR("Couldn't copy mtd into ram: %s\n",
+ strerror(errno));
+ return -MBOX_R_SYSTEM_ERROR;
+ }
+
+ size -= size_read;
+ mem += size_read;
+ } while (size && size_read);
+
+ return size ? -MBOX_R_SYSTEM_ERROR : 0;
+}