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ACPICA: Handle case NumElements > Package length 

Additional update for NumElements fix. Must handle
case where NumElements > Package list length, pad package
with null elements.

Signed-off-by: Alexey Starikovskiy <alexey.y.starikovskiy@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Bob Moore 2007-02-02 19:48:18 +03:00 committed by Len Brown
parent 24058054d7
commit 8f9337c883
1 changed files with 41 additions and 46 deletions
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87
drivers/acpi/dispatcher/dsobject.c
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@ -260,7 +260,7 @@ acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
}
obj_desc->buffer.flags |= AOPOBJ_DATA_VALID;
op->common.node = (struct acpi_namespace_node *)obj_desc;
op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
return_ACPI_STATUS(AE_OK);
}
@ -270,7 +270,8 @@ acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
*
* PARAMETERS: walk_state - Current walk state
* Op - Parser object to be translated
* package_length - Number of elements in the package
* element_count - Number of elements in the package - this is
* the num_elements argument to Package()
* obj_desc_ptr - Where the ACPI internal object is returned
*
* RETURN: Status
@ -278,18 +279,29 @@ acpi_ds_build_internal_buffer_obj(struct acpi_walk_state *walk_state,
* DESCRIPTION: Translate a parser Op package object to the equivalent
* namespace object
*
* NOTE: The number of elements in the package will be always be the num_elements
* count, regardless of the number of elements in the package list. If
* num_elements is smaller, only that many package list elements are used.
* if num_elements is larger, the Package object is padded out with
* objects of type Uninitialized (as per ACPI spec.)
*
* Even though the ASL compilers do not allow num_elements to be smaller
* than the Package list length (for the fixed length package opcode), some
* BIOS code modifies the AML on the fly to adjust the num_elements, and
* this code compensates for that. This also provides compatibility with
* other AML interpreters.
*
******************************************************************************/
acpi_status
acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
union acpi_parse_object *op,
u32 package_length,
u32 element_count,
union acpi_operand_object **obj_desc_ptr)
{
union acpi_parse_object *arg;
union acpi_parse_object *parent;
union acpi_operand_object *obj_desc = NULL;
u32 package_list_length;
acpi_status status = AE_OK;
acpi_native_uint i;
@ -318,43 +330,13 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
obj_desc->package.node = parent->common.node;
}
/* Count the *actual* number of items in the package list */
arg = op->common.value.arg;
arg = arg->common.next;
for (package_list_length = 0; arg; package_list_length++) {
arg = arg->common.next;
}
/*
* The number of elements in the package will be the lesser of the
* specified element count and the length of the initializer list.
*
* Even though the ASL compilers do not allow this to happen (for the
* fixed length package opcode), some BIOS code modifies the AML on the
* fly to adjust the package length, and this code compensates for that.
* This also provides compatibility with other AML interpreters.
*/
obj_desc->package.count = package_length;
if (package_list_length != package_length) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Package length mismatch, using lesser of %X(Length Arg) and %X(AML Length)\n",
package_length, package_list_length));
if (package_list_length < package_length) {
obj_desc->package.count = package_list_length;
}
}
/*
* Allocate the pointer array (array of pointers to the
* individual objects). Add an extra pointer slot so
* that the list is always null terminated.
* Allocate the element array (array of pointers to the individual
* objects) based on the num_elements parameter. Add an extra pointer slot
* so that the list is always null terminated.
*/
obj_desc->package.elements = ACPI_ALLOCATE_ZEROED(((acpi_size)
obj_desc->package.
count +
element_count +
1) * sizeof(void *));
if (!obj_desc->package.elements) {
@ -362,15 +344,20 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
return_ACPI_STATUS(AE_NO_MEMORY);
}
obj_desc->package.count = element_count;
/*
* Initialize all elements of the package
* Initialize the elements of the package, up to the num_elements count.
* Package is automatically padded with uninitialized (NULL) elements
* if num_elements is greater than the package list length. Likewise,
* Package is truncated if num_elements is less than the list length.
*/
arg = op->common.value.arg;
arg = arg->common.next;
for (i = 0; i < obj_desc->package.count; i++) {
for (i = 0; arg && (i < element_count); i++) {
if (arg->common.aml_opcode == AML_INT_RETURN_VALUE_OP) {
/* Object (package or buffer) is already built */
/* This package element is already built, just get it */
obj_desc->package.elements[i] =
ACPI_CAST_PTR(union acpi_operand_object,
@ -384,8 +371,14 @@ acpi_ds_build_internal_package_obj(struct acpi_walk_state *walk_state,
arg = arg->common.next;
}
if (!arg) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Package List length larger than NumElements count (%X), truncated\n",
element_count));
}
obj_desc->package.flags |= AOPOBJ_DATA_VALID;
op->common.node = (struct acpi_namespace_node *)obj_desc;
op->common.node = ACPI_CAST_PTR(struct acpi_namespace_node, obj_desc);
return_ACPI_STATUS(status);
}
@ -499,8 +492,9 @@ acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
/*
* Defer evaluation of Buffer term_arg operand
*/
obj_desc->buffer.node = (struct acpi_namespace_node *)
walk_state->operands[0];
obj_desc->buffer.node =
ACPI_CAST_PTR(struct acpi_namespace_node,
walk_state->operands[0]);
obj_desc->buffer.aml_start = op->named.data;
obj_desc->buffer.aml_length = op->named.length;
break;
@ -510,8 +504,9 @@ acpi_ds_init_object_from_op(struct acpi_walk_state *walk_state,
/*
* Defer evaluation of Package term_arg operand
*/
obj_desc->package.node = (struct acpi_namespace_node *)
walk_state->operands[0];
obj_desc->package.node =
ACPI_CAST_PTR(struct acpi_namespace_node,
walk_state->operands[0]);
obj_desc->package.aml_start = op->named.data;
obj_desc->package.aml_length = op->named.length;
break;