ACPICA: New: I/O port protection

Protect certain I/O ports from reads/writes. Provides MS
compatibility. New module, hwvalid.c

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, 36 insertions, 19 deletions

diff --git a/drivers/acpi/acpica/uteval.c b/drivers/acpi/acpica/uteval.c
index 3b9152579d04..006b16c26017 100644
--- a/drivers/acpi/acpica/uteval.c
+++ b/drivers/acpi/acpica/uteval.c
@@ -59,26 +59,35 @@ acpi_ut_translate_one_cid(union acpi_operand_object *obj_desc,
 
 /*
  * Strings supported by the _OSI predefined (internal) method.
+ *
+ * March 2009: Removed "Linux" as this host no longer wants to respond true
+ * for this string. Basically, the only safe OS strings are windows-related
+ * and in many or most cases represent the only test path within the
+ * BIOS-provided ASL code.
+ *
+ * The second element of each entry is used to track the newest version of
+ * Windows that the BIOS has requested.
  */
-static char *acpi_interfaces_supported[] = {
+static struct acpi_interface_info acpi_interfaces_supported[] = {
         /* Operating System Vendor Strings */
 
-        "Windows 2000",         /* Windows 2000 */
-        "Windows 2001",         /* Windows XP */
-        "Windows 2001 SP1",     /* Windows XP SP1 */
-        "Windows 2001 SP2",     /* Windows XP SP2 */
-        "Windows 2001.1",       /* Windows Server 2003 */
-        "Windows 2001.1 SP1",   /* Windows Server 2003 SP1 - Added 03/2006 */
-        "Windows 2006",         /* Windows Vista - Added 03/2006 */
+        {"Windows 2000", ACPI_OSI_WIN_2000},    /* Windows 2000 */
+        {"Windows 2001", ACPI_OSI_WIN_XP},      /* Windows XP */
+        {"Windows 2001 SP1", ACPI_OSI_WIN_XP_SP1},      /* Windows XP SP1 */
+        {"Windows 2001.1", ACPI_OSI_WINSRV_2003},       /* Windows Server 2003 */
+        {"Windows 2001 SP2", ACPI_OSI_WIN_XP_SP2},      /* Windows XP SP2 */
+        {"Windows 2001.1 SP1", ACPI_OSI_WINSRV_2003_SP1},       /* Windows Server 2003 SP1 - Added 03/2006 */
+        {"Windows 2006", ACPI_OSI_WIN_VISTA},   /* Windows Vista - Added 03/2006 */
 
         /* Feature Group Strings */
 
-        "Extended Address Space Descriptor"
-            /*
-             * All "optional" feature group strings (features that are implemented
-             * by the host) should be implemented in the host version of
-             * acpi_os_validate_interface and should not be added here.
-             */
+        {"Extended Address Space Descriptor", 0}
+
+        /*
+         * All "optional" feature group strings (features that are implemented
+         * by the host) should be implemented in the host version of
+         * acpi_os_validate_interface and should not be added here.
+         */
 };
 
 /*******************************************************************************
@@ -125,9 +134,17 @@ acpi_status acpi_ut_osi_implementation(struct acpi_walk_state *walk_state)
 
         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
                 if (!ACPI_STRCMP(string_desc->string.pointer,
-                                 acpi_interfaces_supported[i])) {
-
-                        /* The interface is supported */
+                                 acpi_interfaces_supported[i].name)) {
+                        /*
+                         * The interface is supported.
+                         * Update the osi_data if necessary. We keep track of the latest
+                         * version of Windows that has been requested by the BIOS.
+                         */
+                        if (acpi_interfaces_supported[i].value >
+                            acpi_gbl_osi_data) {
+                                acpi_gbl_osi_data =
+                                    acpi_interfaces_supported[i].value;
+                        }
 
                         return_value = ACPI_UINT32_MAX;
                         goto exit;
@@ -176,8 +193,8 @@ acpi_status acpi_osi_invalidate(char *interface)
         int i;
 
         for (i = 0; i < ACPI_ARRAY_LENGTH(acpi_interfaces_supported); i++) {
-                if (!ACPI_STRCMP(interface, acpi_interfaces_supported[i])) {
-                        *acpi_interfaces_supported[i] = '\0';
+                if (!ACPI_STRCMP(interface, acpi_interfaces_supported[i].name)) {
+                        *acpi_interfaces_supported[i].name = '\0';
                         return AE_OK;
                 }
         }