in acpica/exoparg2.c [221:451]
acpi_status acpi_ex_opcode_2A_1T_1R(struct acpi_walk_state *walk_state)
{
union acpi_operand_object **operand = &walk_state->operands[0];
union acpi_operand_object *return_desc = NULL;
u64 index;
acpi_status status = AE_OK;
acpi_size length = 0;
ACPI_FUNCTION_TRACE_STR(ex_opcode_2A_1T_1R,
acpi_ps_get_opcode_name(walk_state->opcode));
/* Execute the opcode */
if (walk_state->op_info->flags & AML_MATH) {
/* All simple math opcodes (add, etc.) */
return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
return_desc->integer.value =
acpi_ex_do_math_op(walk_state->opcode,
operand[0]->integer.value,
operand[1]->integer.value);
goto store_result_to_target;
}
switch (walk_state->opcode) {
case AML_MOD_OP: /* Mod (Dividend, Divisor, remainder_result (ACPI 2.0) */
return_desc = acpi_ut_create_internal_object(ACPI_TYPE_INTEGER);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
/* return_desc will contain the remainder */
status = acpi_ut_divide(operand[0]->integer.value,
operand[1]->integer.value,
NULL, &return_desc->integer.value);
break;
case AML_CONCATENATE_OP: /* Concatenate (Data1, Data2, Result) */
status =
acpi_ex_do_concatenate(operand[0], operand[1], &return_desc,
walk_state);
break;
case AML_TO_STRING_OP: /* to_string (Buffer, Length, Result) (ACPI 2.0) */
/*
* Input object is guaranteed to be a buffer at this point (it may have
* been converted.) Copy the raw buffer data to a new object of
* type String.
*/
/*
* Get the length of the new string. It is the smallest of:
* 1) Length of the input buffer
* 2) Max length as specified in the to_string operator
* 3) Length of input buffer up to a zero byte (null terminator)
*
* NOTE: A length of zero is ok, and will create a zero-length, null
* terminated string.
*/
while ((length < operand[0]->buffer.length) && /* Length of input buffer */
(length < operand[1]->integer.value) && /* Length operand */
(operand[0]->buffer.pointer[length])) { /* Null terminator */
length++;
}
/* Allocate a new string object */
return_desc = acpi_ut_create_string_object(length);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
/*
* Copy the raw buffer data with no transform.
* (NULL terminated already)
*/
memcpy(return_desc->string.pointer,
operand[0]->buffer.pointer, length);
break;
case AML_CONCATENATE_TEMPLATE_OP:
/* concatenate_res_template (Buffer, Buffer, Result) (ACPI 2.0) */
status =
acpi_ex_concat_template(operand[0], operand[1],
&return_desc, walk_state);
break;
case AML_INDEX_OP: /* Index (Source Index Result) */
/* Create the internal return object */
return_desc =
acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
if (!return_desc) {
status = AE_NO_MEMORY;
goto cleanup;
}
/* Initialize the Index reference object */
index = operand[1]->integer.value;
return_desc->reference.value = (u32) index;
return_desc->reference.class = ACPI_REFCLASS_INDEX;
/*
* At this point, the Source operand is a String, Buffer, or Package.
* Verify that the index is within range.
*/
switch ((operand[0])->common.type) {
case ACPI_TYPE_STRING:
if (index >= operand[0]->string.length) {
length = operand[0]->string.length;
status = AE_AML_STRING_LIMIT;
}
return_desc->reference.target_type =
ACPI_TYPE_BUFFER_FIELD;
return_desc->reference.index_pointer =
&(operand[0]->buffer.pointer[index]);
break;
case ACPI_TYPE_BUFFER:
if (index >= operand[0]->buffer.length) {
length = operand[0]->buffer.length;
status = AE_AML_BUFFER_LIMIT;
}
return_desc->reference.target_type =
ACPI_TYPE_BUFFER_FIELD;
return_desc->reference.index_pointer =
&(operand[0]->buffer.pointer[index]);
break;
case ACPI_TYPE_PACKAGE:
if (index >= operand[0]->package.count) {
length = operand[0]->package.count;
status = AE_AML_PACKAGE_LIMIT;
}
return_desc->reference.target_type = ACPI_TYPE_PACKAGE;
return_desc->reference.where =
&operand[0]->package.elements[index];
break;
default:
ACPI_ERROR((AE_INFO,
"Invalid object type: %X",
(operand[0])->common.type));
status = AE_AML_INTERNAL;
goto cleanup;
}
/* Failure means that the Index was beyond the end of the object */
if (ACPI_FAILURE(status)) {
ACPI_BIOS_EXCEPTION((AE_INFO, status,
"Index (0x%X%8.8X) is beyond end of object (length 0x%X)",
ACPI_FORMAT_UINT64(index),
(u32)length));
goto cleanup;
}
/*
* Save the target object and add a reference to it for the life
* of the index
*/
return_desc->reference.object = operand[0];
acpi_ut_add_reference(operand[0]);
/* Store the reference to the Target */
status = acpi_ex_store(return_desc, operand[2], walk_state);
/* Return the reference */
walk_state->result_obj = return_desc;
goto cleanup;
default:
ACPI_ERROR((AE_INFO, "Unknown AML opcode 0x%X",
walk_state->opcode));
status = AE_AML_BAD_OPCODE;
break;
}
store_result_to_target:
if (ACPI_SUCCESS(status)) {
/*
* Store the result of the operation (which is now in return_desc) into
* the Target descriptor.
*/
status = acpi_ex_store(return_desc, operand[2], walk_state);
if (ACPI_FAILURE(status)) {
goto cleanup;
}
if (!walk_state->result_obj) {
walk_state->result_obj = return_desc;
}
}
cleanup:
/* Delete return object on error */
if (ACPI_FAILURE(status)) {
acpi_ut_remove_reference(return_desc);
walk_state->result_obj = NULL;
}
return_ACPI_STATUS(status);
}