ACPICA: Allow OS override of all ACPI tables
Previously, the table override mechanism was implemented for the
DSDT only. Now, any table in the RSDT/XSDT can be replaced by
the host OS. (including the DSDT).
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/acpica/tbutils.c b/drivers/acpi/acpica/tbutils.c
index 22ce4898..e285bed 100644
--- a/drivers/acpi/acpica/tbutils.c
+++ b/drivers/acpi/acpica/tbutils.c
@@ -287,7 +287,10 @@
*
* RETURN: None
*
- * DESCRIPTION: Install an ACPI table into the global data structure.
+ * DESCRIPTION: Install an ACPI table into the global data structure. The
+ * table override mechanism is implemented here to allow the host
+ * OS to replace any table before it is installed in the root
+ * table array.
*
******************************************************************************/
@@ -295,7 +298,10 @@
acpi_tb_install_table(acpi_physical_address address,
u8 flags, char *signature, u32 table_index)
{
- struct acpi_table_header *table;
+ acpi_status status;
+ struct acpi_table_header *table_to_install;
+ struct acpi_table_header *mapped_table;
+ struct acpi_table_header *override_table = NULL;
if (!address) {
ACPI_ERROR((AE_INFO,
@@ -306,41 +312,68 @@
/* Map just the table header */
- table = acpi_os_map_memory(address, sizeof(struct acpi_table_header));
- if (!table) {
+ mapped_table =
+ acpi_os_map_memory(address, sizeof(struct acpi_table_header));
+ if (!mapped_table) {
return;
}
- /* If a particular signature is expected, signature must match */
+ /* If a particular signature is expected (DSDT/FACS), it must match */
- if (signature && !ACPI_COMPARE_NAME(table->signature, signature)) {
+ if (signature && !ACPI_COMPARE_NAME(mapped_table->signature, signature)) {
ACPI_ERROR((AE_INFO,
- "Invalid signature 0x%X for ACPI table [%s]",
- *ACPI_CAST_PTR(u32, table->signature), signature));
+ "Invalid signature 0x%X for ACPI table, expected [%s]",
+ *ACPI_CAST_PTR(u32, mapped_table->signature),
+ signature));
goto unmap_and_exit;
}
+ /*
+ * ACPI Table Override:
+ *
+ * Before we install the table, let the host OS override it with a new
+ * one if desired. Any table within the RSDT/XSDT can be replaced,
+ * including the DSDT which is pointed to by the FADT.
+ */
+ status = acpi_os_table_override(mapped_table, &override_table);
+ if (ACPI_SUCCESS(status) && override_table) {
+ ACPI_INFO((AE_INFO,
+ "%4.4s @ 0x%p Table override, replaced with:",
+ mapped_table->signature, ACPI_CAST_PTR(void,
+ address)));
+
+ acpi_gbl_root_table_list.tables[table_index].pointer =
+ override_table;
+ flags = ACPI_TABLE_ORIGIN_OVERRIDE;
+ address = ACPI_PTR_TO_PHYSADDR(override_table);
+
+ table_to_install = override_table;
+ } else {
+ table_to_install = mapped_table;
+ }
+
/* Initialize the table entry */
acpi_gbl_root_table_list.tables[table_index].address = address;
- acpi_gbl_root_table_list.tables[table_index].length = table->length;
+ acpi_gbl_root_table_list.tables[table_index].length =
+ table_to_install->length;
acpi_gbl_root_table_list.tables[table_index].flags = flags;
ACPI_MOVE_32_TO_32(&
(acpi_gbl_root_table_list.tables[table_index].
- signature), table->signature);
+ signature), table_to_install->signature);
- acpi_tb_print_table_header(address, table);
+ acpi_tb_print_table_header(address, table_to_install);
if (table_index == ACPI_TABLE_INDEX_DSDT) {
/* Global integer width is based upon revision of the DSDT */
- acpi_ut_set_integer_width(table->revision);
+ acpi_ut_set_integer_width(table_to_install->revision);
}
unmap_and_exit:
- acpi_os_unmap_memory(table, sizeof(struct acpi_table_header));
+ acpi_os_unmap_memory(mapped_table, sizeof(struct acpi_table_header));
}
/*******************************************************************************