Initial support for VSS format

- normal, auth and apple variations supported
- some UI additions and code cleanup TBD

common/nvram.h

@@ -31,7 +31,9 @@ const QByteArray NVRAM_NVAR_STORAGE_FILE_GUID
 const QByteArray NVRAM_NVAR_EXTERNAL_DEFAULTS_FILE_GUID
 ("\x5B\x31\x21\x92\xBB\x30\xB5\x46\x81\x3E\x1B\x1B\xF4\x71\x2B\xD3", 16);
 
-extern QString variableAttributesToQstring(UINT8 attributes);
+extern QString nvarAttributesToQString(const UINT8 attributes);
+
+extern QString efiTimeToQString(const EFI_TIME & time);
 
 // Make sure we use right packing rules
 #pragma pack(push,1)
@@ -62,6 +64,110 @@ typedef struct _NVAR_VARIABLE_HEADER {
 #define NVRAM_NVAR_VARIABLE_EXT_ATTRIB_AUTH_WRITE  0x10
 #define NVRAM_NVAR_VARIABLE_EXT_ATTRIB_TIME_BASED  0x20
 
+//
+// Next format is TianoCore VSS and it's variations
+//
+
+// FFF12B8D-7696-4C8B-A985-2747075B4F50
+const QByteArray NVRAM_VSS_STORAGE_VOLUME_GUID
+("\x8D\x2B\xF1\xFF\x96\x76\x8B\x4C\xA9\x85\x27\x47\x07\x5B\x4F\x50", 16);
+
+#define NVRAM_VSS_STORE_SIGNATURE            0x53535624 // $VSS
+#define NVRAM_APPLE_SVS_STORE_SIGNATURE      0x53565324 // $SVS
+#define NVRAM_APPLE_FSYS_STORE_SIGNATURE     0x73797346 // Fsys
+#define NVRAM_VSS_VARIABLE_START_ID          0x55AA
+
+// Variable store header flags
+#define NVRAM_VSS_VARIABLE_STORE_FORMATTED  0x5a
+#define NVRAM_VSS_VARIABLE_STORE_HEALTHY    0xfe
+
+// Variable store status
+#define NVRAM_VSS_VARIABLE_STORE_STATUS_RAW     0
+#define NVRAM_VSS_VARIABLE_STORE_STATUS_VALID   1
+#define NVRAM_VSS_VARIABLE_STORE_STATUS_INVALID 2
+#define NVRAM_VSS_VARIABLE_STORE_STATUS_UNKNOWN 3
+
+// Variable store header
+typedef struct _VSS_VARIABLE_STORE_HEADER {
+    UINT32  Signature; // $VSS signature
+    UINT32  Size;      // Size of variable storage, including storage header
+    UINT8   Format;    // Storage format state
+    UINT8   State;     // Storage health state 
+    UINT16  Unknown;   // Used in Apple $SVS varstores
+    UINT32  : 32;
+} VSS_VARIABLE_STORE_HEADER;
+
+// Apple Fsys store header
+typedef struct _APPLE_FSYS_STORE_HEADER {
+    UINT32  Signature; // Fsys signature
+    UINT8   Unknown;   // Still unknown
+    UINT32  Unknown2;  // Still unknown
+    UINT16  Size;      // Size of variable storage
+} APPLE_FSYS_STORE_HEADER;
+
+// Apple Fsys variable format
+// UINT8 NameLength;
+// CHAR8 Name[];
+// UINT16 DataLength;
+// UINT8 Data[]
+// End with a chunk named "EOF" without data
+// All free bytes are zeros
+// Has CRC32 of the whole store without checksum field at the end
+
+// Normal variable header
+typedef struct _VSS_VARIABLE_HEADER {
+    UINT16    StartId;    // Variable start marker AA55
+    UINT8     State;      // Variable state 
+    UINT8     : 8;
+    UINT32    Attributes; // Variable attributes
+    UINT32    NameSize;   // Size of variable name, null-terminated UCS2 string
+    UINT32    DataSize;   // Size of variable data without header and name
+    EFI_GUID  VendorGuid; // Variable vendor GUID
+} VSS_VARIABLE_HEADER;
+
+// Apple variation of normal variable header, with one new field
+typedef struct _VSS_APPLE_VARIABLE_HEADER {
+    UINT16    StartId;    // Variable start marker AA55
+    UINT8     State;      // Variable state 
+    UINT8     : 8;
+    UINT32    Attributes; // Variable attributes
+    UINT32    NameSize;   // Size of variable name, null-terminated UCS2 string
+    UINT32    DataSize;   // Size of variable data without header and name
+    EFI_GUID  VendorGuid; // Variable vendor GUID
+    UINT32    DataCrc32;  // CRC32 of the data
+} VSS_APPLE_VARIABLE_HEADER;
+
+// Authenticated variable header, used for SecureBoot vars
+typedef struct _VSS_AUTH_VARIABLE_HEADER {
+    UINT16    StartId;          // Variable start marker AA55
+    UINT8     State;            // Variable state 
+    UINT8     : 8;
+    UINT32    Attributes;       // Variable attributes
+    UINT64    MonotonicCounter; // Monotonic counter against replay attack
+    EFI_TIME  Timestamp;        // Time stamp against replay attack
+    UINT32    PubKeyIndex;      // Index in PubKey database
+    UINT32    NameSize;         // Size of variable name, null-terminated UCS2 string
+    UINT32    DataSize;         // Size of variable data without header and name
+    EFI_GUID  VendorGuid;       // Variable vendor GUID
+} VSS_AUTH_VARIABLE_HEADER;
+
+// VSS variable states
+#define NVRAM_VSS_VARIABLE_IN_DELETED_TRANSITION     0xfe  // Variable is in obsolete transistion
+#define NVRAM_VSS_VARIABLE_DELETED                   0xfd  // Variable is obsolete
+#define NVRAM_VSS_VARIABLE_HEADER_VALID              0x7f  // Variable has valid header
+#define NVRAM_VSS_VARIABLE_ADDED                     0x3f  // Variable has been completely added
+#define NVRAM_VSS_IS_VARIABLE_STATE(_c, _Mask)  (BOOLEAN) (((~_c) & (~_Mask)) != 0)
+
+// VSS variable attributes
+#define NVRAM_VSS_VARIABLE_NON_VOLATILE                          0x00000001
+#define NVRAM_VSS_VARIABLE_BOOTSERVICE_ACCESS                    0x00000002
+#define NVRAM_VSS_VARIABLE_RUNTIME_ACCESS                        0x00000004
+#define NVRAM_VSS_VARIABLE_HARDWARE_ERROR_RECORD                 0x00000008
+#define NVRAM_VSS_VARIABLE_AUTHENTICATED_WRITE_ACCESS            0x00000010
+#define NVRAM_VSS_VARIABLE_TIME_BASED_AUTHENTICATED_WRITE_ACCESS 0x00000020
+#define NVRAM_VSS_VARIABLE_APPEND_WRITE                          0x00000040
+#define NVRAM_VSS_VARIABLE_APPLE_DATA_CHECKSUM                   0x80000000
+
 // Restore previous packing rules
 #pragma pack(pop)