ACPICA: Add global pointer for FACS table to simplify FACS access

Use a global pointer instead of using AcpiGetTableByIndex for
each FACS access. This simplifies the code for the Global Lock
and the Firmware Waking Vector(s).

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>

2 files changed, 12 insertions, 0 deletions

diff --git a/drivers/acpi/utilities/utglobal.c b/drivers/acpi/utilities/utglobal.c
index 3dc53114395b..211d621f42a9 100644
--- a/drivers/acpi/utilities/utglobal.c
+++ b/drivers/acpi/utilities/utglobal.c
@@ -771,6 +771,7 @@ acpi_status acpi_ut_init_globals(void)
         acpi_gbl_global_lock_mutex = NULL;
         acpi_gbl_global_lock_acquired = FALSE;
         acpi_gbl_global_lock_handle = 0;
+        acpi_gbl_global_lock_present = FALSE;
 
         /* Miscellaneous variables */
 
diff --git a/drivers/acpi/utilities/utxface.c b/drivers/acpi/utilities/utxface.c
index c198a4d40583..7ca8952eb1b8 100644
--- a/drivers/acpi/utilities/utxface.c
+++ b/drivers/acpi/utilities/utxface.c
@@ -45,6 +45,7 @@
 #include <acpi/acevents.h>
 #include <acpi/acnamesp.h>
 #include <acpi/acdebug.h>
+#include <acpi/actables.h>
 
 #define _COMPONENT          ACPI_UTILITIES
 ACPI_MODULE_NAME("utxface")
@@ -148,6 +149,16 @@ acpi_status acpi_enable_subsystem(u32 flags)
         }
 
         /*
+         * Obtain a permanent mapping for the FACS. This is required for the
+         * Global Lock and the Firmware Waking Vector
+         */
+        status = acpi_tb_initialize_facs();
+        if (ACPI_FAILURE(status)) {
+                ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
+                return_ACPI_STATUS(status);
+        }
+
+        /*
          * Install the default op_region handlers. These are installed unless
          * other handlers have already been installed via the
          * install_address_space_handler interface.