Add VbSharedData field parsing

firmware/include/vboot_struct.h

 /* 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.
  *
  * Data structure definitions for verified boot, for on-disk / in-eeprom
  * data.
  */
 
 #ifndef VBOOT_REFERENCE_VBOOT_STRUCT_H_
 #define VBOOT_REFERENCE_VBOOT_STRUCT_H_
@@ skipping 113 matching lines @@
   VbSignature body_signature;        /* Signature for the kernel body */
 } __attribute__((packed)) VbKernelPreambleHeader;
 /* This should be followed by:
  *   2) The signature data for the kernel body, pointed to by
  *      body_signature.sig_offset.
  *   3) The signature data for (VBFirmwarePreambleHeader + body signature
  *      data), pointed to by preamble_signature.sig_offset. */
 
 #define EXPECTED_VBKERNELPREAMBLEHEADER_SIZE 96
 
+/* Magic number for recognizing VbSharedDataHeader ("VbSD") */
+#define VB_SHARED_DATA_MAGIC 0x44536256
+
 /* Minimum and recommended size of shared_data_blob in bytes. */
 #define VB_SHARED_DATA_MIN_SIZE 3072
 #define VB_SHARED_DATA_REC_SIZE 16384
 
+/* Flags for VbSharedDataHeader */
+/* LoadFirmware() tried firmware B because of VbNvStorage firmware B tries */
+#define VBSD_FWB_TRIED                  0x00000001
+/* LoadKernel() verified the kernel keyblock using the kernel subkey from
+ * the firmware.  If this flag is not present, it just used the hash of the
+ * kernel keyblock. */
+#define VBSD_KERNEL_KEY_VERIFIED        0x00000002
+/* LoadFirmware() was told the developer switch was on */
+#define VBSD_LF_DEV_SWITCH_ON           0x00000004
+
+/* Result codes for checking firmware A and B */
+#define VBSD_LF_CHECK_NOT_DONE          0
+#define VBSD_LF_CHECK_DEV_MISMATCH      1
+#define VBSD_LF_CHECK_REC_MISMATCH      2
+#define VBSD_LF_CHECK_VERIFY_KEYBLOCK   3
+#define VBSD_LF_CHECK_KEY_ROLLBACK      4
+#define VBSD_LF_CHECK_DATA_KEY_PARSE    5
+#define VBSD_LF_CHECK_VERIFY_PREAMBLE   6
+#define VBSD_LF_CHECK_FW_ROLLBACK       7
+#define VBSD_LF_CHECK_HEADER_VALID      8
+#define VBSD_LF_CHECK_GET_FW_BODY       9
+#define VBSD_LF_CHECK_HASH_WRONG_SIZE   10
+#define VBSD_LF_CHECK_VERIFY_BODY       11
+#define VBSD_LF_CHECK_VALID             12
+
 /* Data shared between LoadFirmware(), LoadKernel(), and OS.
  *
  * The boot process is:
  *   1) Caller allocates buffer, at least VB_SHARED_DATA_MIN bytes, ideally
  *      VB_SHARED_DATA_REC_SIZE bytes.
  *   2) If non-recovery boot, this is passed to LoadFirmware(), which
  *      initializes the buffer, adding this header and some data.
  *   3) Buffer is passed to LoadKernel().  If this is a recovery boot,
  *      LoadKernel() initializes the buffer, adding this header.  Regardless
  *      of boot type, LoadKernel() adds some data to the buffer.
  *   4) Caller makes data available to the OS in a platform-dependent manner.
  *      For example, via ACPI or ATAGs. */
 typedef struct VbSharedDataHeader {
   /* Fields present in version 1 */
+  uint32_t magic;                     /* Magic number for struct
+                                       * (VB_SHARED_DATA_MAGIC) */
   uint32_t struct_version;            /* Version of this structure */
   uint64_t struct_size;               /* Size of this structure in bytes */
   uint64_t data_size;                 /* Size of shared data buffer in bytes */
   uint64_t data_used;                 /* Amount of shared data used so far */
+  uint32_t flags;                     /* Flags */
 
   VbPublicKey kernel_subkey;          /* Kernel subkey, from firmware */
   uint64_t kernel_subkey_data_offset; /* Offset of kernel subkey data from
                                        * start of this struct */
   uint64_t kernel_subkey_data_size;   /* Size of kernel subkey data */
 
-  uint64_t flags;                     /* Flags */
-
   /* Timer values from VbGetTimer().  Unused values are set to 0.  If a
    * function is called mutiple times, these are the times from the
    * most recent call. */
   uint64_t timer_load_firmware_start_enter;  /* LoadFirmwareStart() - enter */
   uint64_t timer_load_firmware_start_exit;   /* LoadFirmwareStart() - exit */
   uint64_t timer_load_firmware_enter;        /* LoadFirmware() - enter */
   uint64_t timer_load_firmware_exit;         /* LoadFirmware() - exit */
   uint64_t timer_load_kernel_enter;          /* LoadKernel() - enter */
   uint64_t timer_load_kernel_exit;           /* LoadKernel() - exit */
 
+  uint8_t check_fw_a_result;          /* Result of checking RW firmware A */
+  uint8_t check_fw_b_result;          /* Result of checking RW firmware B */
+  uint8_t firmware_index;             /* Firmware index returned by
+                                       * LoadFirmware() or 0xFF if failure */
+  uint32_t fw_version_tpm_start;      /* Firmware TPM version at start */
+  uint32_t fw_version_lowest;         /* Firmware lowest version found */
+
   /* After read-only firmware which uses version 1 is released, any additional
    * fields must be added below, and the struct version must be increased.
    * Before reading/writing those fields, make sure that the struct being
    * accessed is at least version 2.
    *
    * It's always ok for an older firmware to access a newer struct, since all
    * the fields it knows about are present.  Newer firmware needs to use
    * reasonable defaults when accessing older structs. */
 
 } __attribute__((packed)) VbSharedDataHeader;
 
 #define VB_SHARED_DATA_VERSION 1      /* Version for struct_version */
 
 __pragma(pack(pop)) /* Support packing for MSVC. */
 
 #endif  /* VBOOT_REFERENCE_VBOOT_STRUCT_H_ */