+ACPI_MODULE_NAME("tbxfroot")
+
+/* Local prototypes */
+static acpi_status
+acpi_tb_find_rsdp(struct acpi_table_desc *table_info, u32 flags);
+
+static u8 *acpi_tb_scan_memory_for_rsdp(u8 * start_address, u32 length);
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_tb_validate_rsdp
+ *
+ * PARAMETERS: Rsdp - Pointer to unvalidated RSDP
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Validate the RSDP (ptr)
+ *
+ ******************************************************************************/
+
+acpi_status acpi_tb_validate_rsdp(struct rsdp_descriptor *rsdp)
+{
+ ACPI_FUNCTION_ENTRY();
+
+ /*
+ * The signature and checksum must both be correct
+ */
+ if (ACPI_STRNCMP((char *)rsdp, RSDP_SIG, sizeof(RSDP_SIG) - 1) != 0) {
+ /* Nope, BAD Signature */
+
+ return (AE_BAD_SIGNATURE);
+ }
+
+ /* Check the standard checksum */
+
+ if (acpi_tb_generate_checksum(rsdp, ACPI_RSDP_CHECKSUM_LENGTH) != 0) {
+ return (AE_BAD_CHECKSUM);
+ }
+
+ /* Check extended checksum if table version >= 2 */
+
+ if ((rsdp->revision >= 2) &&
+ (acpi_tb_generate_checksum(rsdp, ACPI_RSDP_XCHECKSUM_LENGTH) !=
+ 0)) {
+ return (AE_BAD_CHECKSUM);
+ }