Import ACPICA 20100331.vendor/acpica/20100331

1 files changed, 82 insertions, 0 deletions

diff --git a/tables/tbutils.c b/tables/tbutils.c
index a496556f43e3..eb8bc43597d0 100644
--- a/tables/tbutils.c
+++ b/tables/tbutils.c
@@ -395,6 +395,88 @@ AcpiTbChecksum (
 
 /*******************************************************************************
  *
+ * FUNCTION:    AcpiTbCheckDsdtHeader
+ *
+ * PARAMETERS:  None
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Quick compare to check validity of the DSDT. This will detect
+ *              if the DSDT has been replaced from outside the OS and/or if
+ *              the DSDT header has been corrupted.
+ *
+ ******************************************************************************/
+
+void
+AcpiTbCheckDsdtHeader (
+    void)
+{
+
+    /* Compare original length and checksum to current values */
+
+    if (AcpiGbl_OriginalDsdtHeader.Length != AcpiGbl_DSDT->Length ||
+        AcpiGbl_OriginalDsdtHeader.Checksum != AcpiGbl_DSDT->Checksum)
+    {
+        ACPI_ERROR ((AE_INFO,
+            "The DSDT has been corrupted or replaced - old, new headers below"));
+        AcpiTbPrintTableHeader (0, &AcpiGbl_OriginalDsdtHeader);
+        AcpiTbPrintTableHeader (0, AcpiGbl_DSDT);
+
+        /* Disable further error messages */
+
+        AcpiGbl_OriginalDsdtHeader.Length = AcpiGbl_DSDT->Length;
+        AcpiGbl_OriginalDsdtHeader.Checksum = AcpiGbl_DSDT->Checksum;
+    }
+}
+
+
+/*******************************************************************************
+ *
+ * FUNCTION:    AcpiTbCopyDsdt
+ *
+ * PARAMETERS:  TableDesc           - Installed table to copy
+ *
+ * RETURN:      None
+ *
+ * DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory.
+ *              Some very bad BIOSs are known to either corrupt the DSDT or
+ *              install a new, bad DSDT. This copy works around the problem.
+ *
+ ******************************************************************************/
+
+ACPI_TABLE_HEADER *
+AcpiTbCopyDsdt (
+    UINT32                  TableIndex)
+{
+    ACPI_TABLE_HEADER       *NewTable;
+    ACPI_TABLE_DESC         *TableDesc;
+
+
+    TableDesc = &AcpiGbl_RootTableList.Tables[TableIndex];
+
+    NewTable = ACPI_ALLOCATE (TableDesc->Length);
+    if (!NewTable)
+    {
+        ACPI_ERROR ((AE_INFO, "Could not copy DSDT of length 0x%X",
+            TableDesc->Length));
+        return (NULL);
+    }
+
+    ACPI_MEMCPY (NewTable, TableDesc->Pointer, TableDesc->Length);
+    AcpiTbDeleteTable (TableDesc);
+    TableDesc->Pointer = NewTable;
+    TableDesc->Flags = ACPI_TABLE_ORIGIN_ALLOCATED;
+
+    ACPI_INFO ((AE_INFO,
+        "Forced DSDT copy: length 0x%05X copied locally, original unmapped",
+        NewTable->Length));
+
+    return (NewTable);
+}
+
+
+/*******************************************************************************
+ *
  * FUNCTION:    AcpiTbInstallTable
  *
  * PARAMETERS:  Address                 - Physical address of DSDT or FACS