cgptlib stub for verified boot development.

src/platform/vboot_reference/cgptlib/cgpt.c

+/* Copyright (c) 2010 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 "cgpt.h"
+
+/* stub code */
+static int start[] = { 34, 10034 };
+
+int GPTInit(GPTData_t *gpt) {
+        gpt->current_kernel = 1;
+        return 0;
+}
+
+int GPTNextKernelEntry(GPTData_t *gpt, uint64_t *start_sector, uint64_t *size) {
+        gpt->current_kernel ^= 1;
+        if (start_sector) *start_sector = start[gpt->current_kernel];
+        if (size) *size = 10000;
+        return 0;
+}
+
+int GPTUpdateKernelEntry(GPTData_t *gpt, uint32_t update_type) {
+        gpt->modified |= (GPT_MODIFIED_HEADER1 | GPT_MODIFIED_ENTRIES1) <<
+                         gpt->current_kernel;
+        return 0;
+}