EFI: Add table OSL supports for acpiexec

This patch implements table OSLs for acpiexec in EFI environment:
1. Adds AcpiOsTableOverride() to use acpiexec loaded xSDT tables.
2. Adds a stub AcpiOsPhysicalTableOverride().
Note that currently we only support emulator mode acpiexec in EFI
environment, thus all table overrides, RSDP location are implemented in the
same way as its windows/unix versions. Lv Zheng.

Signed-off-by: Lv Zheng <lv.zheng@intel.com>

source/os_specific/service_layers/osefixf.c

@@ -121,8 +121,17 @@
         ACPI_MODULE_NAME    ("osefixf")
 
 
+/* Upcalls to AcpiExec */
+
+void
+AeTableOverride (
+    ACPI_TABLE_HEADER       *ExistingTable,
+    ACPI_TABLE_HEADER       **NewTable);
+
 /* Local prototypes */
 
+#ifndef ACPI_USE_NATIVE_RSDP_POINTER
+
 static BOOLEAN
 AcpiEfiCompareGuid (
     EFI_GUID                *Guid1,
@@ -232,6 +241,74 @@ AcpiOsGetRootPointer (
     return (Address);
 }
 
+#endif
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    AcpiOsTableOverride
+ *
+ * PARAMETERS:  ExistingTable       - Header of current table (probably
+ *                                    firmware)
+ *              NewTable            - Where an entire new table is returned.
+ *
+ * RETURN:      Status, pointer to new table. Null pointer returned if no
+ *              table is available to override
+ *
+ * DESCRIPTION: Return a different version of a table if one is available
+ *
+ *****************************************************************************/
+
+ACPI_STATUS
+AcpiOsTableOverride (
+    ACPI_TABLE_HEADER       *ExistingTable,
+    ACPI_TABLE_HEADER       **NewTable)
+{
+
+    if (!ExistingTable || !NewTable)
+    {
+        return (AE_BAD_PARAMETER);
+    }
+
+    *NewTable = NULL;
+
+#ifdef ACPI_EXEC_APP
+
+    AeTableOverride (ExistingTable, NewTable);
+    return (AE_OK);
+#else
+
+    return (AE_NO_ACPI_TABLES);
+#endif
+}
+
+
+/******************************************************************************
+ *
+ * FUNCTION:    AcpiOsPhysicalTableOverride
+ *
+ * PARAMETERS:  ExistingTable       - Header of current table (probably firmware)
+ *              NewAddress          - Where new table address is returned
+ *                                    (Physical address)
+ *              NewTableLength      - Where new table length is returned
+ *
+ * RETURN:      Status, address/length of new table. Null pointer returned
+ *              if no table is available to override.
+ *
+ * DESCRIPTION: Returns AE_SUPPORT, function not used in user space.
+ *
+ *****************************************************************************/
+
+ACPI_STATUS
+AcpiOsPhysicalTableOverride (
+    ACPI_TABLE_HEADER       *ExistingTable,
+    ACPI_PHYSICAL_ADDRESS   *NewAddress,
+    UINT32                  *NewTableLength)
+{
+
+    return (AE_SUPPORT);
+}
+
 
 /******************************************************************************
  *