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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>
This commit is contained in:
Bob Moore 2012-12-31 00:07:18 +00:00 committed by Rafael J. Wysocki
parent 3e5621a750
commit ef42e53f27
6 changed files with 28 additions and 14 deletions
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2
drivers/acpi/acpica/acinterp.h
View File

@ -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);

14
drivers/acpi/acpica/dsobject.c
View File

@ -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;

4
drivers/acpi/acpica/dswexec.c
View File

@ -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

2
drivers/acpi/acpica/exconvrt.c
View File

@ -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);
}

2
drivers/acpi/acpica/exstoren.c
View File

@ -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:

18
drivers/acpi/acpica/exutils.c
View File

@ -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);
}
/*******************************************************************************