ACPICA: Tables: Add acpi_install_table() API for early table installation.

This patch adds a new API - acpi_install_table(). OSPMs can use this API
to install tables during early boot stage.  Lv Zheng.

References: https://lkml.org/lkml/2014/2/28/372
Cc: Thomas Renninger <trenn@suse.de>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
[rjw: Subject]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

1 files changed, 11 insertions, 5 deletions

diff --git a/drivers/acpi/acpica/tbinstal.c b/drivers/acpi/acpica/tbinstal.c
index de10d3245d9c..9835213269e6 100644
--- a/drivers/acpi/acpica/tbinstal.c
+++ b/drivers/acpi/acpica/tbinstal.c
@@ -394,6 +394,7 @@ static void acpi_tb_release_temporal_table(struct acpi_table_desc *table_desc)
  *
  * PARAMETERS:  table_index             - Index into root table array
  *              new_table_desc          - New table descriptor to install
+ *              override                - Whether override should be performed
  *
  * RETURN:      None
  *
@@ -406,7 +407,8 @@ static void acpi_tb_release_temporal_table(struct acpi_table_desc *table_desc)
 
 void
 acpi_tb_install_and_override_table(u32 table_index,
-                                   struct acpi_table_desc *new_table_desc)
+                                   struct acpi_table_desc *new_table_desc,
+                                   u8 override)
 {
         if (table_index >= acpi_gbl_root_table_list.current_table_count) {
                 return;
@@ -419,7 +421,9 @@ acpi_tb_install_and_override_table(u32 table_index,
          * one if desired. Any table within the RSDT/XSDT can be replaced,
          * including the DSDT which is pointed to by the FADT.
          */
-        acpi_tb_override_table(new_table_desc);
+        if (override) {
+                acpi_tb_override_table(new_table_desc);
+        }
 
         acpi_tb_install_table(&acpi_gbl_root_table_list.tables[table_index],
                               new_table_desc->address, new_table_desc->flags,
@@ -484,7 +488,7 @@ acpi_tb_install_fixed_table(acpi_physical_address address,
                 goto release_and_exit;
         }
 
-        acpi_tb_install_and_override_table(table_index, &new_table_desc);
+        acpi_tb_install_and_override_table(table_index, &new_table_desc, TRUE);
 
 release_and_exit:
 
@@ -547,6 +551,7 @@ acpi_tb_is_equivalent_table(struct acpi_table_desc *table_desc, u32 table_index)
  *                                    address depending on the table_flags)
  *              flags               - Flags for the table
  *              reload              - Whether reload should be performed
+ *              override            - Whether override should be performed
  *              table_index         - Where the table index is returned
  *
  * RETURN:      Status
@@ -562,7 +567,8 @@ acpi_tb_is_equivalent_table(struct acpi_table_desc *table_desc, u32 table_index)
 
 acpi_status
 acpi_tb_install_non_fixed_table(acpi_physical_address address,
-                                u8 flags, u8 reload, u32 *table_index)
+                                u8 flags,
+                                u8 reload, u8 override, u32 *table_index)
 {
         u32 i;
         acpi_status status = AE_OK;
@@ -687,7 +693,7 @@ acpi_tb_install_non_fixed_table(acpi_physical_address address,
                 goto release_and_exit;
         }
         *table_index = i;
-        acpi_tb_install_and_override_table(i, &new_table_desc);
+        acpi_tb_install_and_override_table(i, &new_table_desc, override);
 
 release_and_exit: