452 lines
12 KiB
C
452 lines
12 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
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*
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* Copyright (C) 2000 - 2022, Intel Corp.
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*
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*****************************************************************************/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "acinterp.h"
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#include "amlcode.h"
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#define _COMPONENT ACPI_EXECUTER
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ACPI_MODULE_NAME("exmisc")
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_get_object_reference
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*
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* PARAMETERS: obj_desc - Create a reference to this object
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* return_desc - Where to store the reference
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* walk_state - Current state
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*
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* RETURN: Status
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*
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* DESCRIPTION: Obtain and return a "reference" to the target object
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* Common code for the ref_of_op and the cond_ref_of_op.
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*
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******************************************************************************/
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acpi_status
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acpi_ex_get_object_reference(union acpi_operand_object *obj_desc,
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union acpi_operand_object **return_desc,
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struct acpi_walk_state *walk_state)
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{
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union acpi_operand_object *reference_obj;
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union acpi_operand_object *referenced_obj;
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ACPI_FUNCTION_TRACE_PTR(ex_get_object_reference, obj_desc);
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*return_desc = NULL;
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switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
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case ACPI_DESC_TYPE_OPERAND:
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if (obj_desc->common.type != ACPI_TYPE_LOCAL_REFERENCE) {
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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/*
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* Must be a reference to a Local or Arg
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*/
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switch (obj_desc->reference.class) {
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case ACPI_REFCLASS_LOCAL:
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case ACPI_REFCLASS_ARG:
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case ACPI_REFCLASS_DEBUG:
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/* The referenced object is the pseudo-node for the local/arg */
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referenced_obj = obj_desc->reference.object;
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break;
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default:
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ACPI_ERROR((AE_INFO, "Invalid Reference Class 0x%2.2X",
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obj_desc->reference.class));
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return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
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}
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break;
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case ACPI_DESC_TYPE_NAMED:
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/*
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* A named reference that has already been resolved to a Node
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*/
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referenced_obj = obj_desc;
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break;
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default:
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ACPI_ERROR((AE_INFO, "Invalid descriptor type 0x%X",
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ACPI_GET_DESCRIPTOR_TYPE(obj_desc)));
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return_ACPI_STATUS(AE_TYPE);
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}
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/* Create a new reference object */
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reference_obj =
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acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
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if (!reference_obj) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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reference_obj->reference.class = ACPI_REFCLASS_REFOF;
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reference_obj->reference.object = referenced_obj;
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*return_desc = reference_obj;
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ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
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"Object %p Type [%s], returning Reference %p\n",
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obj_desc, acpi_ut_get_object_type_name(obj_desc),
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*return_desc));
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return_ACPI_STATUS(AE_OK);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_do_math_op
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*
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* PARAMETERS: opcode - AML opcode
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* integer0 - Integer operand #0
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* integer1 - Integer operand #1
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*
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* RETURN: Integer result of the operation
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*
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* DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
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* math functions here is to prevent a lot of pointer dereferencing
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* to obtain the operands.
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*
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******************************************************************************/
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u64 acpi_ex_do_math_op(u16 opcode, u64 integer0, u64 integer1)
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{
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ACPI_FUNCTION_ENTRY();
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switch (opcode) {
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case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */
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return (integer0 + integer1);
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case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */
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return (integer0 & integer1);
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case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */
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return (~(integer0 & integer1));
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case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */
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return (integer0 | integer1);
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case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */
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return (~(integer0 | integer1));
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case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */
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return (integer0 ^ integer1);
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case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */
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return (integer0 * integer1);
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case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */
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/*
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* We need to check if the shiftcount is larger than the integer bit
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* width since the behavior of this is not well-defined in the C language.
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*/
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if (integer1 >= acpi_gbl_integer_bit_width) {
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return (0);
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}
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return (integer0 << integer1);
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case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */
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/*
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* We need to check if the shiftcount is larger than the integer bit
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* width since the behavior of this is not well-defined in the C language.
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*/
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if (integer1 >= acpi_gbl_integer_bit_width) {
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return (0);
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}
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return (integer0 >> integer1);
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case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */
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return (integer0 - integer1);
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default:
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return (0);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_do_logical_numeric_op
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*
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* PARAMETERS: opcode - AML opcode
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* integer0 - Integer operand #0
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* integer1 - Integer operand #1
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* logical_result - TRUE/FALSE result of the operation
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
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* operators (LAnd and LOr), both operands must be integers.
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*
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* Note: cleanest machine code seems to be produced by the code
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* below, rather than using statements of the form:
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* Result = (Integer0 && Integer1);
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*
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******************************************************************************/
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acpi_status
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acpi_ex_do_logical_numeric_op(u16 opcode,
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u64 integer0, u64 integer1, u8 *logical_result)
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{
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acpi_status status = AE_OK;
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u8 local_result = FALSE;
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ACPI_FUNCTION_TRACE(ex_do_logical_numeric_op);
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switch (opcode) {
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case AML_LOGICAL_AND_OP: /* LAnd (Integer0, Integer1) */
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if (integer0 && integer1) {
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local_result = TRUE;
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}
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break;
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case AML_LOGICAL_OR_OP: /* LOr (Integer0, Integer1) */
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if (integer0 || integer1) {
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local_result = TRUE;
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}
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break;
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default:
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ACPI_ERROR((AE_INFO,
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"Invalid numeric logical opcode: %X", opcode));
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status = AE_AML_INTERNAL;
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break;
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}
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/* Return the logical result and status */
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*logical_result = local_result;
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return_ACPI_STATUS(status);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ex_do_logical_op
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*
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* PARAMETERS: opcode - AML opcode
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* operand0 - operand #0
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* operand1 - operand #1
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* logical_result - TRUE/FALSE result of the operation
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*
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* RETURN: Status
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*
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* DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
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* functions here is to prevent a lot of pointer dereferencing
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* to obtain the operands and to simplify the generation of the
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* logical value. For the Numeric operators (LAnd and LOr), both
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* operands must be integers. For the other logical operators,
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* operands can be any combination of Integer/String/Buffer. The
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* first operand determines the type to which the second operand
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* will be converted.
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*
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* Note: cleanest machine code seems to be produced by the code
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* below, rather than using statements of the form:
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* Result = (Operand0 == Operand1);
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*
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******************************************************************************/
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acpi_status
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acpi_ex_do_logical_op(u16 opcode,
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union acpi_operand_object *operand0,
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union acpi_operand_object *operand1, u8 * logical_result)
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{
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union acpi_operand_object *local_operand1 = operand1;
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u64 integer0;
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u64 integer1;
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u32 length0;
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u32 length1;
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acpi_status status = AE_OK;
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u8 local_result = FALSE;
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int compare;
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ACPI_FUNCTION_TRACE(ex_do_logical_op);
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/*
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* Convert the second operand if necessary. The first operand
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* determines the type of the second operand, (See the Data Types
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* section of the ACPI 3.0+ specification.) Both object types are
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* guaranteed to be either Integer/String/Buffer by the operand
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* resolution mechanism.
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*/
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switch (operand0->common.type) {
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case ACPI_TYPE_INTEGER:
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status = acpi_ex_convert_to_integer(operand1, &local_operand1,
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ACPI_IMPLICIT_CONVERSION);
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break;
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case ACPI_TYPE_STRING:
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status =
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acpi_ex_convert_to_string(operand1, &local_operand1,
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ACPI_IMPLICIT_CONVERT_HEX);
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break;
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case ACPI_TYPE_BUFFER:
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status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
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break;
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default:
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ACPI_ERROR((AE_INFO,
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"Invalid object type for logical operator: %X",
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operand0->common.type));
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status = AE_AML_INTERNAL;
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break;
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}
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if (ACPI_FAILURE(status)) {
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goto cleanup;
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}
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/*
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* Two cases: 1) Both Integers, 2) Both Strings or Buffers
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*/
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if (operand0->common.type == ACPI_TYPE_INTEGER) {
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/*
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* 1) Both operands are of type integer
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* Note: local_operand1 may have changed above
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*/
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integer0 = operand0->integer.value;
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integer1 = local_operand1->integer.value;
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switch (opcode) {
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case AML_LOGICAL_EQUAL_OP: /* LEqual (Operand0, Operand1) */
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if (integer0 == integer1) {
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local_result = TRUE;
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}
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break;
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case AML_LOGICAL_GREATER_OP: /* LGreater (Operand0, Operand1) */
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if (integer0 > integer1) {
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local_result = TRUE;
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}
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break;
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case AML_LOGICAL_LESS_OP: /* LLess (Operand0, Operand1) */
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if (integer0 < integer1) {
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local_result = TRUE;
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}
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break;
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default:
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ACPI_ERROR((AE_INFO,
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"Invalid comparison opcode: %X", opcode));
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status = AE_AML_INTERNAL;
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break;
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}
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} else {
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/*
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* 2) Both operands are Strings or both are Buffers
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* Note: Code below takes advantage of common Buffer/String
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* object fields. local_operand1 may have changed above. Use
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* memcmp to handle nulls in buffers.
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*/
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length0 = operand0->buffer.length;
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length1 = local_operand1->buffer.length;
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/* Lexicographic compare: compare the data bytes */
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compare = memcmp(operand0->buffer.pointer,
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local_operand1->buffer.pointer,
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(length0 > length1) ? length1 : length0);
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switch (opcode) {
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case AML_LOGICAL_EQUAL_OP: /* LEqual (Operand0, Operand1) */
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/* Length and all bytes must be equal */
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if ((length0 == length1) && (compare == 0)) {
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/* Length and all bytes match ==> TRUE */
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local_result = TRUE;
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}
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break;
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case AML_LOGICAL_GREATER_OP: /* LGreater (Operand0, Operand1) */
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if (compare > 0) {
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local_result = TRUE;
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goto cleanup; /* TRUE */
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}
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if (compare < 0) {
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goto cleanup; /* FALSE */
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}
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/* Bytes match (to shortest length), compare lengths */
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if (length0 > length1) {
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local_result = TRUE;
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}
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break;
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case AML_LOGICAL_LESS_OP: /* LLess (Operand0, Operand1) */
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if (compare > 0) {
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goto cleanup; /* FALSE */
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}
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if (compare < 0) {
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local_result = TRUE;
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goto cleanup; /* TRUE */
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}
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/* Bytes match (to shortest length), compare lengths */
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if (length0 < length1) {
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local_result = TRUE;
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}
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break;
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default:
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ACPI_ERROR((AE_INFO,
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"Invalid comparison opcode: %X", opcode));
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status = AE_AML_INTERNAL;
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break;
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}
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}
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cleanup:
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/* New object was created if implicit conversion performed - delete */
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if (local_operand1 != operand1) {
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acpi_ut_remove_reference(local_operand1);
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}
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/* Return the logical result and status */
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*logical_result = local_result;
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return_ACPI_STATUS(status);
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}
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