-#define ACPI_UNKNOWN_NAME (u32) 0x3F3F3F3F /* Unknown name is "????" */
-#define ACPI_ROOT_NAME (u32) 0x5F5F5F5C /* Root name is "\___" */
-#define ACPI_SYS_BUS_NAME (u32) 0x5F53425F /* Sys bus name is "_SB_" */
+#define ACPI_UNKNOWN_NAME (u32) 0x3F3F3F3F /* Unknown name is "????" */
+#define ACPI_ROOT_NAME (u32) 0x5F5F5F5C /* Root name is "\___" */
+
+#define ACPI_PREFIX_MIXED (u32) 0x69706341 /* "Acpi" */
+#define ACPI_PREFIX_LOWER (u32) 0x69706361 /* "acpi" */