upgrade to linux 2.6.10-1.12_FC2

[linux-2.6.git] / drivers / acpi / tables / tbconvrt.c

diff --git a/drivers/acpi/tables/tbconvrt.c b/drivers/acpi/tables/tbconvrt.c
index c2156cf..65a90b3 100644 (file)
--- a/drivers/acpi/tables/tbconvrt.c
+++ b/drivers/acpi/tables/tbconvrt.c
@@ -41,6 +41,7 @@
  * POSSIBILITY OF SUCH DAMAGES.
  */
 
+#include <linux/module.h>
 
 #include <acpi/acpi.h>
 #include <acpi/actables.h>
@@ -50,6 +51,9 @@
         ACPI_MODULE_NAME    ("tbconvrt")
 
 
+u8 acpi_fadt_is_v1;
+EXPORT_SYMBOL(acpi_fadt_is_v1);
+
 /*******************************************************************************
  *
  * FUNCTION:    acpi_tb_get_table_count
@@ -212,6 +216,7 @@ acpi_tb_convert_fadt1 (
 
        /* ACPI 1.0 FACS */
        /* The BIOS stored FADT should agree with Revision 1.0 */
+       acpi_fadt_is_v1 = 1;
 
        /*
         * Copy the table header and the common part of the tables.
@@ -240,9 +245,12 @@ acpi_tb_convert_fadt1 (
        /*
         * Processor Performance State Control. This is the value OSPM writes to
         * the SMI_CMD register to assume processor performance state control
-        * responsibility. There isn't any equivalence in 1.0, leave it zeroed.
+        * responsibility. There isn't any equivalence in 1.0, but as many 1.x
+        * ACPI tables contain _PCT and _PSS we also keep this value, unless
+        * acpi_strict is set.
         */
-       local_fadt->pstate_cnt = 0;
+       if (acpi_strict)
+               local_fadt->pstate_cnt = 0;
 
        /*
         * Support for the _CST object and C States change notification.
@@ -251,20 +259,24 @@ acpi_tb_convert_fadt1 (
        local_fadt->cst_cnt = 0;
 
        /*
-        * Support for ACPI system reset mechanism was introduced between
-        * Spec revisions 1.0b and 2.0, for legacy free systems..
+        * FADT Rev 2 was an interim FADT released between ACPI 1.0 and ACPI 2.0.
+        * It primarily adds the FADT reset mechanism.
         */
-       if (original_fadt->revision == FADT2_INTERIM_REVISION_ID && original_fadt->length == FADT2_INTERIM_LENGTH) {
+       if ((original_fadt->revision == 2) &&
+               (original_fadt->length == sizeof (struct fadt_descriptor_rev2_minus))) {
                /*
-                * Copy the entire GAS, plus the 1-byte reset value that
-                * immediately follows.
+                * Grab the entire generic address struct, plus the 1-byte reset value
+                * that immediately follows.
                 */
-               ACPI_MEMCPY (&local_fadt->reset_register, &((FADT_DESCRIPTOR *)original_fadt)->reset_register, sizeof(struct acpi_generic_address) + 1);
-       } else {
+               ACPI_MEMCPY (&local_fadt->reset_register,
+                       &((struct fadt_descriptor_rev2_minus *) original_fadt)->reset_register,
+                       sizeof (struct acpi_generic_address) + 1);
+       }
+       else {
                /*
-                * Otherwise, there isn't any equivalence in 1.0 and it's
-                * highly likely that a 1.0 system has legacy support.
-                */
+                * Since there isn't any equivalence in 1.0 and since it is highly
+                * likely that a 1.0 system has legacy support.
+                */
                local_fadt->iapc_boot_arch = BAF_LEGACY_DEVICES;
        }
 
@@ -430,23 +442,21 @@ acpi_tb_convert_table_fadt (void)
 
 
        /*
-        * acpi_gbl_FADT is valid
-        * Allocate and zero the 2.0 FADT buffer
-        */
-       local_fadt = ACPI_MEM_CALLOCATE (sizeof (struct fadt_descriptor_rev2));
-       if (local_fadt == NULL) {
-               return_ACPI_STATUS (AE_NO_MEMORY);
-       }
-
-       /*
-        * FADT length and version validation.  The table must be at least as
-        * long as the version 1.0 FADT
+        * acpi_gbl_FADT is valid. Validate the FADT length. The table must be
+        * at least as long as the version 1.0 FADT
         */
        if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev1)) {
-               ACPI_REPORT_ERROR (("Invalid FADT table length: 0x%X\n", acpi_gbl_FADT->length));
+               ACPI_REPORT_ERROR (("FADT is invalid, too short: 0x%X\n", acpi_gbl_FADT->length));
                return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
        }
 
+       /* Allocate buffer for the ACPI 2.0(+) FADT */
+
+       local_fadt = ACPI_MEM_CALLOCATE (sizeof (struct fadt_descriptor_rev2));
+       if (!local_fadt) {
+               return_ACPI_STATUS (AE_NO_MEMORY);
+       }
+
        if (acpi_gbl_FADT->revision >= FADT2_REVISION_ID) {
                if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev2)) {
                        /* Length is too short to be a V2.0 table */