ACPICA: Interpreter: Add warning if 64-bit constant appears in 32-bit table.

Some ASL compilers allow 64-bit constants within a 32-bit table
(DSDT version == 1). When encountered, emit a warning that the
constant will be truncated to 32 bits. This is potentially a
serious problem in the ACPI table(s).

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lv Zheng <lv.zheng@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

diff --git a/drivers/acpi/acpica/acinterp.h b/drivers/acpi/acpica/acinterp.h
index eb30863..16469b0 100644 (file)
--- a/drivers/acpi/acpica/acinterp.h
+++ b/drivers/acpi/acpica/acinterp.h
@@ -458,7 +458,7 @@ void acpi_ex_reacquire_interpreter(void);
 
 void acpi_ex_relinquish_interpreter(void);
 
-void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc);
+u8 acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc);
 
 void acpi_ex_acquire_global_lock(u32 rule);
 

diff --git a/drivers/acpi/acpica/dsobject.c b/drivers/acpi/acpica/dsobject.c
index 13844a1..82050bc 100644 (file)
--- a/drivers/acpi/acpica/dsobject.c
+++ b/drivers/acpi/acpica/dsobject.c
@@ -703,7 +703,7 @@ acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
                                /* Truncate value if we are executing from a 32-bit ACPI table */
 
 #ifndef ACPI_NO_METHOD_EXECUTION
-                               acpi_ex_truncate_for32bit_table(obj_desc);
+                               (void)acpi_ex_truncate_for32bit_table(obj_desc);
 #endif
                                break;
 
@@ -725,8 +725,18 @@ acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
                case AML_TYPE_LITERAL:
 
                        obj_desc->integer.value = op->common.value.integer;
+
 #ifndef ACPI_NO_METHOD_EXECUTION
-                       acpi_ex_truncate_for32bit_table(obj_desc);
+                       if (acpi_ex_truncate_for32bit_table(obj_desc)) {
+
+                               /* Warn if we found a 64-bit constant in a 32-bit table */
+
+                               ACPI_WARNING((AE_INFO,
+                                             "Truncated 64-bit constant found in 32-bit table: %8.8X%8.8X => %8.8X",
+                                             ACPI_FORMAT_UINT64(op->common.
+                                                                value.integer),
+                                             (u32)obj_desc->integer.value));
+                       }
 #endif
                        break;
 

diff --git a/drivers/acpi/acpica/dswexec.c b/drivers/acpi/acpica/dswexec.c
index 5859393..9e0d210 100644 (file)
--- a/drivers/acpi/acpica/dswexec.c
+++ b/drivers/acpi/acpica/dswexec.c
@@ -149,7 +149,7 @@ acpi_ds_get_predicate_value(struct acpi_walk_state *walk_state,
 
        /* Truncate the predicate to 32-bits if necessary */
 
-       acpi_ex_truncate_for32bit_table(local_obj_desc);
+       (void)acpi_ex_truncate_for32bit_table(local_obj_desc);
 
        /*
         * Save the result of the predicate evaluation on
@@ -706,7 +706,7 @@ acpi_status acpi_ds_exec_end_op(struct acpi_walk_state *walk_state)
         * ACPI 2.0 support for 64-bit integers: Truncate numeric
         * result value if we are executing from a 32-bit ACPI table
         */
-       acpi_ex_truncate_for32bit_table(walk_state->result_obj);
+       (void)acpi_ex_truncate_for32bit_table(walk_state->result_obj);
 
        /*
         * Check if we just completed the evaluation of a

diff --git a/drivers/acpi/acpica/exconvrt.c b/drivers/acpi/acpica/exconvrt.c
index 4492a4e..d6a7b6f 100644 (file)
--- a/drivers/acpi/acpica/exconvrt.c
+++ b/drivers/acpi/acpica/exconvrt.c
@@ -176,7 +176,7 @@ acpi_ex_convert_to_integer(union acpi_operand_object *obj_desc,
 
        /* Save the Result */
 
-       acpi_ex_truncate_for32bit_table(return_desc);
+       (void)acpi_ex_truncate_for32bit_table(return_desc);
        *result_desc = return_desc;
        return_ACPI_STATUS(AE_OK);
 }

diff --git a/drivers/acpi/acpica/exstoren.c b/drivers/acpi/acpica/exstoren.c
index 87153bb..85a74b7 100644 (file)
--- a/drivers/acpi/acpica/exstoren.c
+++ b/drivers/acpi/acpica/exstoren.c
@@ -253,7 +253,7 @@ acpi_ex_store_object_to_object(union acpi_operand_object *source_desc,
 
                /* Truncate value if we are executing from a 32-bit ACPI table */
 
-               acpi_ex_truncate_for32bit_table(dest_desc);
+               (void)acpi_ex_truncate_for32bit_table(dest_desc);
                break;
 
        case ACPI_TYPE_STRING:

diff --git a/drivers/acpi/acpica/exutils.c b/drivers/acpi/acpica/exutils.c
index 02ddc4c..e624958 100644 (file)
--- a/drivers/acpi/acpica/exutils.c
+++ b/drivers/acpi/acpica/exutils.c
@@ -202,35 +202,39 @@ void acpi_ex_relinquish_interpreter(void)
  *
  * PARAMETERS:  obj_desc        - Object to be truncated
  *
- * RETURN:      none
+ * RETURN:      TRUE if a truncation was performed, FALSE otherwise.
  *
  * DESCRIPTION: Truncate an ACPI Integer to 32 bits if the execution mode is
  *              32-bit, as determined by the revision of the DSDT.
  *
  ******************************************************************************/
 
-void acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc)
+u8 acpi_ex_truncate_for32bit_table(union acpi_operand_object *obj_desc)
 {
 
        ACPI_FUNCTION_ENTRY();
 
        /*
         * Object must be a valid number and we must be executing
-        * a control method. NS node could be there for AML_INT_NAMEPATH_OP.
+        * a control method. Object could be NS node for AML_INT_NAMEPATH_OP.
         */
        if ((!obj_desc) ||
            (ACPI_GET_DESCRIPTOR_TYPE(obj_desc) != ACPI_DESC_TYPE_OPERAND) ||
            (obj_desc->common.type != ACPI_TYPE_INTEGER)) {
-               return;
+               return (FALSE);
        }
 
-       if (acpi_gbl_integer_byte_width == 4) {
+       if ((acpi_gbl_integer_byte_width == 4) &&
+           (obj_desc->integer.value > (u64)ACPI_UINT32_MAX)) {
                /*
-                * We are running a method that exists in a 32-bit ACPI table.
+                * We are executing in a 32-bit ACPI table.
                 * Truncate the value to 32 bits by zeroing out the upper 32-bit field
                 */
-               obj_desc->integer.value &= (u64) ACPI_UINT32_MAX;
+               obj_desc->integer.value &= (u64)ACPI_UINT32_MAX;
+               return (TRUE);
        }
+
+       return (FALSE);
 }
 
 /*******************************************************************************