ACPICA: Add override for dynamic tables

Add a call to acpi_os_table_override during the installation of a
dynamic table (loaded via the Load or LoadTable AML operators).

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>

1 files changed, 27 insertions, 1 deletions

diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c
index 37374b21969d..ef269a297b57 100644
--- a/drivers/acpi/acpica/tbinstal.c
+++ b/drivers/acpi/acpica/tbinstal.c
@@ -103,7 +103,9 @@ acpi_status acpi_tb_verify_table(struct acpi_table_desc *table_desc)
  *
  * RETURN:      Status
  *
- * DESCRIPTION: This function is called to add the ACPI table
+ * DESCRIPTION: This function is called to add an ACPI table. It is used to
+ *              dynamically load tables via the Load and load_table AML
+ *              operators.
  *
  ******************************************************************************/
 
@@ -112,6 +114,7 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
 {
         u32 i;
         acpi_status status = AE_OK;
+        struct acpi_table_header *override_table = NULL;
 
         ACPI_FUNCTION_TRACE(tb_add_table);
 
@@ -201,6 +204,29 @@ acpi_tb_add_table(struct acpi_table_desc *table_desc, u32 *table_index)
                 }
         }
 
+        /*
+         * ACPI Table Override:
+         * Allow the host to override dynamically loaded tables.
+         */
+        status = acpi_os_table_override(table_desc->pointer, &override_table);
+        if (ACPI_SUCCESS(status) && override_table) {
+                ACPI_INFO((AE_INFO,
+                           "%4.4s @ 0x%p Table override, replaced with:",
+                           table_desc->pointer->signature,
+                           ACPI_CAST_PTR(void, table_desc->address)));
+
+                /* We can delete the table that was passed as a parameter */
+
+                acpi_tb_delete_table(table_desc);
+
+                /* Setup descriptor for the new table */
+
+                table_desc->address = ACPI_PTR_TO_PHYSADDR(override_table);
+                table_desc->pointer = override_table;
+                table_desc->length = override_table->length;
+                table_desc->flags = ACPI_TABLE_ORIGIN_OVERRIDE;
+        }
+
         /* Add the table to the global root table list */
 
         status = acpi_tb_store_table(table_desc->address, table_desc->pointer,