vendorcode: Add ChromeOS VPD parser.

Copied (and unmodified) the minimal bits from ChromeOS libVPD:
 https://chromium.googlesource.com/chromiumos/platform/vpd

Old-Change-Id: Id75d1bfd16263ac1b94c22979f9892cf7908d5e6
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/187411
Reviewed-by: Yung-chieh Lo <yjlou@chromium.org>
(cherry picked from commit a10ca23686299f3fd5b639631242cadaa2ca9e8a)

vendorcode: Update ChromeOS VPD Parser.

Merge recent changes in ChromeOS VPD that allows non-memory-mapped firmware
to load VPD easier and faster (ref:
 https://chromium-review.googlesource.com/188134 ).

Old-Change-Id: I3ee0b89c703f476f3d77cdde52cc7588724f7686
Reviewed-on: https://chromium-review.googlesource.com/188743
Tested-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-by: Yung-chieh Lo <yjlou@chromium.org>
Reviewed-by: David Hendricks <dhendrix@chromium.org>
Commit-Queue: Hung-Te Lin <hungte@chromium.org>
(cherry picked from commit 03f4d521a7fa711b963b0e1822e92eac16a691b1)

vendorcode: Access to ChromeOS VPD on default CBFS media.

The new function "cros_vpd_gets(key, buf, size)" provides an easy and quick way
to retrieve values in ChromeOS VPD section.

Old-Change-Id: I38e50615e515707ffaecdc4c4fae65043541b687
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/187430
Reviewed-by: Yung-chieh Lo <yjlou@chromium.org>
(cherry picked from commit bcd3832c06e8ed357c50f19396da21a218dc4b39)

Squashed 3 related commits for a ChromeOS VPD parser.

Change-Id: I4ba8fce16ea123c78d7b543c8353ab9bc1e2aa9f
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6959
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Tested-by: build bot (Jenkins)

1 files changed, 89 insertions, 0 deletions

diff --git a/src/vendorcode/google/chromeos/vpd_decode.c b/src/vendorcode/google/chromeos/vpd_decode.c
new file mode 100644
index 0000000000..545fd8106f
--- /dev/null
+++ b/src/vendorcode/google/chromeos/vpd_decode.c
@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2014 The Chromium OS Authors. All rights reserved.
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ *
+ */
+#include <assert.h>
+#include "lib_vpd.h"
+
+int decodeLen(
+    const int32_t max_len,
+    const uint8_t *in,
+    int32_t *length,
+    int32_t *decoded_len) {
+  uint8_t more;
+  int i = 0;
+
+  assert(length);
+  assert(decoded_len);
+
+  *length = 0;
+  do {
+    if (i >= max_len) return VPD_FAIL;
+    more = in[i] & 0x80;
+    *length <<= 7;
+    *length |= in[i] & 0x7f;
+    ++i;
+  } while (more);
+
+  *decoded_len = i;
+
+  return VPD_OK;
+}
+
+/* Sequentially decodes type, key, and value.
+ */
+int decodeVpdString(
+    const int32_t max_len,
+    const uint8_t *input_buf,
+    int32_t *consumed,
+    VpdDecodeCallback callback,
+    void *callback_arg) {
+  int type;
+  int32_t key_len, value_len;
+  int32_t decoded_len;
+  const uint8_t *key, *value;
+
+  /* type */
+  if (*consumed >= max_len)
+    return VPD_FAIL;
+
+  type = input_buf[*consumed];
+  switch (type) {
+    case VPD_TYPE_INFO:
+    case VPD_TYPE_STRING:
+      (*consumed)++;
+
+      /* key */
+      if (VPD_OK != decodeLen(max_len - *consumed, &input_buf[*consumed],
+                              &key_len, &decoded_len) ||
+          *consumed + decoded_len >= max_len) {
+        return VPD_FAIL;
+      }
+
+      *consumed += decoded_len;
+      key = &input_buf[*consumed];
+      *consumed += key_len;
+
+      /* value */
+      if (VPD_OK != decodeLen(max_len - *consumed, &input_buf[*consumed],
+                              &value_len, &decoded_len) ||
+          *consumed + decoded_len > max_len) {
+        return VPD_FAIL;
+      }
+      *consumed += decoded_len;
+      value = &input_buf[*consumed];
+      *consumed += value_len;
+
+      if (type == VPD_TYPE_STRING)
+        return callback(key, key_len, value, value_len, callback_arg);
+
+      return VPD_OK;
+
+    default:
+      return VPD_FAIL;
+      break;
+  }
+  return VPD_OK;
+}