Cherry-pick vboot_reference files from TOT to support crossystem

firmware/lib/vboot_common.c

 /* Copyright (c) 2011 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.
  *
  * Common functions between firmware and kernel verified boot.
  * (Firmware portion)
  */
 
 
 #include "vboot_common.h"
@@ skipping 363 matching lines @@
     VBDEBUG(("Kernel body signature off end of preamble\n"));
     return VBOOT_PREAMBLE_INVALID;
   }
 
   /* Success */
   return VBOOT_SUCCESS;
 }
 
 
 int VbSharedDataInit(VbSharedDataHeader* header, uint64_t size) {
+
+  VBDEBUG(("VbSharedDataInit, %d bytes, header %d bytes\n", (int)size,
+           sizeof(VbSharedDataHeader)));
+
   if (size < sizeof(VbSharedDataHeader)) {
     VBDEBUG(("Not enough data for header.\n"));
     return VBOOT_SHARED_DATA_INVALID;
   }
   if (size < VB_SHARED_DATA_MIN_SIZE) {
     VBDEBUG(("Shared data buffer too small.\n"));
     return VBOOT_SHARED_DATA_INVALID;
   }
 
   if (!header)
     return VBOOT_SHARED_DATA_INVALID;
 
   /* Zero the header */
   Memset(header, 0, sizeof(VbSharedDataHeader));
 
   /* Initialize fields */
+  header->magic = VB_SHARED_DATA_MAGIC;
   header->struct_version = VB_SHARED_DATA_VERSION;
   header->struct_size = sizeof(VbSharedDataHeader);
   header->data_size = size;
   header->data_used = sizeof(VbSharedDataHeader);
+  header->firmware_index = 0xFF;
 
   /* Success */
   return VBOOT_SUCCESS;
 }
 
 
 uint64_t VbSharedDataReserve(VbSharedDataHeader* header, uint64_t size) {
   uint64_t offs = header->data_used;
 
+  VBDEBUG(("VbSharedDataReserve %d bytes at %d\n", (int)size, (int)offs));
+
   if (!header || size > header->data_size - header->data_used) {
     VBDEBUG(("VbSharedData buffer out of space.\n"));
     return 0;  /* Not initialized, or not enough space left. */
   }
   header->data_used += size;
   return offs;
 }
 
 
 int VbSharedDataSetKernelKey(VbSharedDataHeader* header,
@@ skipping 12 matching lines @@
       return VBOOT_SHARED_DATA_INVALID;
     header->kernel_subkey_data_size = src->key_size;
   }
 
   /* Copy the kernel sign key blob into the destination buffer */
   PublicKeyInit(kdest, (uint8_t*)header + header->kernel_subkey_data_offset,
                 header->kernel_subkey_data_size);
 
   return PublicKeyCopy(kdest, src);
 }