ACPI_MODULE_NAME("tbutils")
/* Local prototypes */
-static acpi_status acpi_tb_validate_xsdt(acpi_physical_address address);
-
static acpi_physical_address
acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size);
}
}
-/*******************************************************************************
- *
- * FUNCTION: acpi_tb_validate_xsdt
- *
- * PARAMETERS: address - Physical address of the XSDT (from RSDP)
- *
- * RETURN: Status. AE_OK if the table appears to be valid.
- *
- * DESCRIPTION: Validate an XSDT to ensure that it is of minimum size and does
- * not contain any NULL entries. A problem that is seen in the
- * field is that the XSDT exists, but is actually useless because
- * of one or more (or all) NULL entries.
- *
- ******************************************************************************/
-
-static acpi_status acpi_tb_validate_xsdt(acpi_physical_address xsdt_address)
-{
- struct acpi_table_header *table;
- u8 *next_entry;
- acpi_physical_address address;
- u32 length;
- u32 entry_count;
- acpi_status status;
- u32 i;
-
- /* Get the XSDT length */
-
- table =
- acpi_os_map_memory(xsdt_address, sizeof(struct acpi_table_header));
- if (!table) {
- return (AE_NO_MEMORY);
- }
-
- length = table->length;
- acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
-
- /*
- * Minimum XSDT length is the size of the standard ACPI header
- * plus one physical address entry
- */
- if (length < (sizeof(struct acpi_table_header) + ACPI_XSDT_ENTRY_SIZE)) {
- return (AE_INVALID_TABLE_LENGTH);
- }
-
- /* Map the entire XSDT */
-
- table = acpi_os_map_memory(xsdt_address, length);
- if (!table) {
- return (AE_NO_MEMORY);
- }
-
- /* Get the number of entries and pointer to first entry */
-
- status = AE_OK;
- next_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header));
- entry_count = (u32)((table->length - sizeof(struct acpi_table_header)) /
- ACPI_XSDT_ENTRY_SIZE);
-
- /* Validate each entry (physical address) within the XSDT */
-
- for (i = 0; i < entry_count; i++) {
- address =
- acpi_tb_get_root_table_entry(next_entry,
- ACPI_XSDT_ENTRY_SIZE);
- if (!address) {
-
- /* Detected a NULL entry, XSDT is invalid */
-
- status = AE_NULL_ENTRY;
- break;
- }
-
- next_entry += ACPI_XSDT_ENTRY_SIZE;
- }
-
- /* Unmap table */
-
- acpi_os_unmap_memory(table, length);
- return (status);
-}
-
/*******************************************************************************
*
* FUNCTION: acpi_tb_parse_root_table
u32 table_count;
struct acpi_table_header *table;
acpi_physical_address address;
- acpi_physical_address rsdt_address;
u32 length;
u8 *table_entry;
acpi_status status;
* as per the ACPI specification.
*/
address = (acpi_physical_address) rsdp->xsdt_physical_address;
- rsdt_address =
- (acpi_physical_address) rsdp->rsdt_physical_address;
table_entry_size = ACPI_XSDT_ENTRY_SIZE;
} else {
/* Root table is an RSDT (32-bit physical addresses) */
address = (acpi_physical_address) rsdp->rsdt_physical_address;
- rsdt_address = address;
table_entry_size = ACPI_RSDT_ENTRY_SIZE;
}
*/
acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp));
- /*
- * If it is present and used, validate the XSDT for access/size
- * and ensure that all table entries are at least non-NULL
- */
- if (table_entry_size == ACPI_XSDT_ENTRY_SIZE) {
- status = acpi_tb_validate_xsdt(address);
- if (ACPI_FAILURE(status)) {
- ACPI_BIOS_WARNING((AE_INFO,
- "XSDT is invalid (%s), using RSDT",
- acpi_format_exception(status)));
-
- /* Fall back to the RSDT */
-
- address = rsdt_address;
- table_entry_size = ACPI_RSDT_ENTRY_SIZE;
- }
- }
-
/* Map the RSDT/XSDT table header to get the full table length */
table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));