--- /dev/null
+/******************************************************************************
+ *
+ * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
+ *
+ *****************************************************************************/
+
+/*
+ * Copyright (C) 2000 - 2015, Intel Corp.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions, and the following disclaimer,
+ * without modification.
+ * 2. Redistributions in binary form must reproduce at minimum a disclaimer
+ * substantially similar to the "NO WARRANTY" disclaimer below
+ * ("Disclaimer") and any redistribution must be conditioned upon
+ * including a substantially similar Disclaimer requirement for further
+ * binary redistribution.
+ * 3. Neither the names of the above-listed copyright holders nor the names
+ * of any contributors may be used to endorse or promote products derived
+ * from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * NO WARRANTY
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
+ * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGES.
+ */
+
+#include <acpi/acpi.h>
+#include "accommon.h"
+#include "acinterp.h"
+#include "amlcode.h"
+#include "amlresrc.h"
+
+#define _COMPONENT ACPI_EXECUTER
+ACPI_MODULE_NAME("exmisc")
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_get_object_reference
+ *
+ * PARAMETERS: obj_desc - Create a reference to this object
+ * return_desc - Where to store the reference
+ * walk_state - Current state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Obtain and return a "reference" to the target object
+ * Common code for the ref_of_op and the cond_ref_of_op.
+ *
+ ******************************************************************************/
+acpi_status
+acpi_ex_get_object_reference(union acpi_operand_object *obj_desc,
+ union acpi_operand_object **return_desc,
+ struct acpi_walk_state *walk_state)
+{
+ union acpi_operand_object *reference_obj;
+ union acpi_operand_object *referenced_obj;
+
+ ACPI_FUNCTION_TRACE_PTR(ex_get_object_reference, obj_desc);
+
+ *return_desc = NULL;
+
+ switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) {
+ case ACPI_DESC_TYPE_OPERAND:
+
+ if (obj_desc->common.type != ACPI_TYPE_LOCAL_REFERENCE) {
+ return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+ }
+
+ /*
+ * Must be a reference to a Local or Arg
+ */
+ switch (obj_desc->reference.class) {
+ case ACPI_REFCLASS_LOCAL:
+ case ACPI_REFCLASS_ARG:
+ case ACPI_REFCLASS_DEBUG:
+
+ /* The referenced object is the pseudo-node for the local/arg */
+
+ referenced_obj = obj_desc->reference.object;
+ break;
+
+ default:
+
+ ACPI_ERROR((AE_INFO, "Unknown Reference Class 0x%2.2X",
+ obj_desc->reference.class));
+ return_ACPI_STATUS(AE_AML_INTERNAL);
+ }
+ break;
+
+ case ACPI_DESC_TYPE_NAMED:
+ /*
+ * A named reference that has already been resolved to a Node
+ */
+ referenced_obj = obj_desc;
+ break;
+
+ default:
+
+ ACPI_ERROR((AE_INFO, "Invalid descriptor type 0x%X",
+ ACPI_GET_DESCRIPTOR_TYPE(obj_desc)));
+ return_ACPI_STATUS(AE_TYPE);
+ }
+
+ /* Create a new reference object */
+
+ reference_obj =
+ acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE);
+ if (!reference_obj) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ reference_obj->reference.class = ACPI_REFCLASS_REFOF;
+ reference_obj->reference.object = referenced_obj;
+ *return_desc = reference_obj;
+
+ ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
+ "Object %p Type [%s], returning Reference %p\n",
+ obj_desc, acpi_ut_get_object_type_name(obj_desc),
+ *return_desc));
+
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_concat_template
+ *
+ * PARAMETERS: operand0 - First source object
+ * operand1 - Second source object
+ * actual_return_desc - Where to place the return object
+ * walk_state - Current walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Concatenate two resource templates
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_concat_template(union acpi_operand_object *operand0,
+ union acpi_operand_object *operand1,
+ union acpi_operand_object **actual_return_desc,
+ struct acpi_walk_state *walk_state)
+{
+ acpi_status status;
+ union acpi_operand_object *return_desc;
+ u8 *new_buf;
+ u8 *end_tag;
+ acpi_size length0;
+ acpi_size length1;
+ acpi_size new_length;
+
+ ACPI_FUNCTION_TRACE(ex_concat_template);
+
+ /*
+ * Find the end_tag descriptor in each resource template.
+ * Note1: returned pointers point TO the end_tag, not past it.
+ * Note2: zero-length buffers are allowed; treated like one end_tag
+ */
+
+ /* Get the length of the first resource template */
+
+ status = acpi_ut_get_resource_end_tag(operand0, &end_tag);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer);
+
+ /* Get the length of the second resource template */
+
+ status = acpi_ut_get_resource_end_tag(operand1, &end_tag);
+ if (ACPI_FAILURE(status)) {
+ return_ACPI_STATUS(status);
+ }
+
+ length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer);
+
+ /* Combine both lengths, minimum size will be 2 for end_tag */
+
+ new_length = length0 + length1 + sizeof(struct aml_resource_end_tag);
+
+ /* Create a new buffer object for the result (with one end_tag) */
+
+ return_desc = acpi_ut_create_buffer_object(new_length);
+ if (!return_desc) {
+ return_ACPI_STATUS(AE_NO_MEMORY);
+ }
+
+ /*
+ * Copy the templates to the new buffer, 0 first, then 1 follows. One
+ * end_tag descriptor is copied from Operand1.
+ */
+ new_buf = return_desc->buffer.pointer;
+ ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length0);
+ ACPI_MEMCPY(new_buf + length0, operand1->buffer.pointer, length1);
+
+ /* Insert end_tag and set the checksum to zero, means "ignore checksum" */
+
+ new_buf[new_length - 1] = 0;
+ new_buf[new_length - 2] = ACPI_RESOURCE_NAME_END_TAG | 1;
+
+ /* Return the completed resource template */
+
+ *actual_return_desc = return_desc;
+ return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_do_concatenate
+ *
+ * PARAMETERS: operand0 - First source object
+ * operand1 - Second source object
+ * actual_return_desc - Where to place the return object
+ * walk_state - Current walk state
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Concatenate two objects OF THE SAME TYPE.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_do_concatenate(union acpi_operand_object *operand0,
+ union acpi_operand_object *operand1,
+ union acpi_operand_object **actual_return_desc,
+ struct acpi_walk_state *walk_state)
+{
+ union acpi_operand_object *local_operand1 = operand1;
+ union acpi_operand_object *return_desc;
+ char *new_buf;
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE(ex_do_concatenate);
+
+ /*
+ * Convert the second operand if necessary. The first operand
+ * determines the type of the second operand, (See the Data Types
+ * section of the ACPI specification.) Both object types are
+ * guaranteed to be either Integer/String/Buffer by the operand
+ * resolution mechanism.
+ */
+ switch (operand0->common.type) {
+ case ACPI_TYPE_INTEGER:
+
+ status =
+ acpi_ex_convert_to_integer(operand1, &local_operand1, 16);
+ break;
+
+ case ACPI_TYPE_STRING:
+
+ status = acpi_ex_convert_to_string(operand1, &local_operand1,
+ ACPI_IMPLICIT_CONVERT_HEX);
+ break;
+
+ case ACPI_TYPE_BUFFER:
+
+ status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
+ break;
+
+ default:
+
+ ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X",
+ operand0->common.type));
+ status = AE_AML_INTERNAL;
+ }
+
+ if (ACPI_FAILURE(status)) {
+ goto cleanup;
+ }
+
+ /*
+ * Both operands are now known to be the same object type
+ * (Both are Integer, String, or Buffer), and we can now perform the
+ * concatenation.
+ */
+
+ /*
+ * There are three cases to handle:
+ *
+ * 1) Two Integers concatenated to produce a new Buffer
+ * 2) Two Strings concatenated to produce a new String
+ * 3) Two Buffers concatenated to produce a new Buffer
+ */
+ switch (operand0->common.type) {
+ case ACPI_TYPE_INTEGER:
+
+ /* Result of two Integers is a Buffer */
+ /* Need enough buffer space for two integers */
+
+ return_desc = acpi_ut_create_buffer_object((acpi_size)
+ ACPI_MUL_2
+ (acpi_gbl_integer_byte_width));
+ if (!return_desc) {
+ status = AE_NO_MEMORY;
+ goto cleanup;
+ }
+
+ new_buf = (char *)return_desc->buffer.pointer;
+
+ /* Copy the first integer, LSB first */
+
+ ACPI_MEMCPY(new_buf, &operand0->integer.value,
+ acpi_gbl_integer_byte_width);
+
+ /* Copy the second integer (LSB first) after the first */
+
+ ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width,
+ &local_operand1->integer.value,
+ acpi_gbl_integer_byte_width);
+ break;
+
+ case ACPI_TYPE_STRING:
+
+ /* Result of two Strings is a String */
+
+ return_desc = acpi_ut_create_string_object(((acpi_size)
+ operand0->string.
+ length +
+ local_operand1->
+ string.length));
+ if (!return_desc) {
+ status = AE_NO_MEMORY;
+ goto cleanup;
+ }
+
+ new_buf = return_desc->string.pointer;
+
+ /* Concatenate the strings */
+
+ ACPI_STRCPY(new_buf, operand0->string.pointer);
+ ACPI_STRCPY(new_buf + operand0->string.length,
+ local_operand1->string.pointer);
+ break;
+
+ case ACPI_TYPE_BUFFER:
+
+ /* Result of two Buffers is a Buffer */
+
+ return_desc = acpi_ut_create_buffer_object(((acpi_size)
+ operand0->buffer.
+ length +
+ local_operand1->
+ buffer.length));
+ if (!return_desc) {
+ status = AE_NO_MEMORY;
+ goto cleanup;
+ }
+
+ new_buf = (char *)return_desc->buffer.pointer;
+
+ /* Concatenate the buffers */
+
+ ACPI_MEMCPY(new_buf, operand0->buffer.pointer,
+ operand0->buffer.length);
+ ACPI_MEMCPY(new_buf + operand0->buffer.length,
+ local_operand1->buffer.pointer,
+ local_operand1->buffer.length);
+ break;
+
+ default:
+
+ /* Invalid object type, should not happen here */
+
+ ACPI_ERROR((AE_INFO, "Invalid object type: 0x%X",
+ operand0->common.type));
+ status = AE_AML_INTERNAL;
+ goto cleanup;
+ }
+
+ *actual_return_desc = return_desc;
+
+cleanup:
+ if (local_operand1 != operand1) {
+ acpi_ut_remove_reference(local_operand1);
+ }
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_do_math_op
+ *
+ * PARAMETERS: opcode - AML opcode
+ * integer0 - Integer operand #0
+ * integer1 - Integer operand #1
+ *
+ * RETURN: Integer result of the operation
+ *
+ * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the
+ * math functions here is to prevent a lot of pointer dereferencing
+ * to obtain the operands.
+ *
+ ******************************************************************************/
+
+u64 acpi_ex_do_math_op(u16 opcode, u64 integer0, u64 integer1)
+{
+
+ ACPI_FUNCTION_ENTRY();
+
+ switch (opcode) {
+ case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */
+
+ return (integer0 + integer1);
+
+ case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */
+
+ return (integer0 & integer1);
+
+ case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */
+
+ return (~(integer0 & integer1));
+
+ case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */
+
+ return (integer0 | integer1);
+
+ case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */
+
+ return (~(integer0 | integer1));
+
+ case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */
+
+ return (integer0 ^ integer1);
+
+ case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */
+
+ return (integer0 * integer1);
+
+ case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */
+
+ /*
+ * We need to check if the shiftcount is larger than the integer bit
+ * width since the behavior of this is not well-defined in the C language.
+ */
+ if (integer1 >= acpi_gbl_integer_bit_width) {
+ return (0);
+ }
+ return (integer0 << integer1);
+
+ case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */
+
+ /*
+ * We need to check if the shiftcount is larger than the integer bit
+ * width since the behavior of this is not well-defined in the C language.
+ */
+ if (integer1 >= acpi_gbl_integer_bit_width) {
+ return (0);
+ }
+ return (integer0 >> integer1);
+
+ case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */
+
+ return (integer0 - integer1);
+
+ default:
+
+ return (0);
+ }
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_do_logical_numeric_op
+ *
+ * PARAMETERS: opcode - AML opcode
+ * integer0 - Integer operand #0
+ * integer1 - Integer operand #1
+ * logical_result - TRUE/FALSE result of the operation
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric
+ * operators (LAnd and LOr), both operands must be integers.
+ *
+ * Note: cleanest machine code seems to be produced by the code
+ * below, rather than using statements of the form:
+ * Result = (Integer0 && Integer1);
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_do_logical_numeric_op(u16 opcode,
+ u64 integer0, u64 integer1, u8 *logical_result)
+{
+ acpi_status status = AE_OK;
+ u8 local_result = FALSE;
+
+ ACPI_FUNCTION_TRACE(ex_do_logical_numeric_op);
+
+ switch (opcode) {
+ case AML_LAND_OP: /* LAnd (Integer0, Integer1) */
+
+ if (integer0 && integer1) {
+ local_result = TRUE;
+ }
+ break;
+
+ case AML_LOR_OP: /* LOr (Integer0, Integer1) */
+
+ if (integer0 || integer1) {
+ local_result = TRUE;
+ }
+ break;
+
+ default:
+
+ status = AE_AML_INTERNAL;
+ break;
+ }
+
+ /* Return the logical result and status */
+
+ *logical_result = local_result;
+ return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION: acpi_ex_do_logical_op
+ *
+ * PARAMETERS: opcode - AML opcode
+ * operand0 - operand #0
+ * operand1 - operand #1
+ * logical_result - TRUE/FALSE result of the operation
+ *
+ * RETURN: Status
+ *
+ * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the
+ * functions here is to prevent a lot of pointer dereferencing
+ * to obtain the operands and to simplify the generation of the
+ * logical value. For the Numeric operators (LAnd and LOr), both
+ * operands must be integers. For the other logical operators,
+ * operands can be any combination of Integer/String/Buffer. The
+ * first operand determines the type to which the second operand
+ * will be converted.
+ *
+ * Note: cleanest machine code seems to be produced by the code
+ * below, rather than using statements of the form:
+ * Result = (Operand0 == Operand1);
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_do_logical_op(u16 opcode,
+ union acpi_operand_object *operand0,
+ union acpi_operand_object *operand1, u8 * logical_result)
+{
+ union acpi_operand_object *local_operand1 = operand1;
+ u64 integer0;
+ u64 integer1;
+ u32 length0;
+ u32 length1;
+ acpi_status status = AE_OK;
+ u8 local_result = FALSE;
+ int compare;
+
+ ACPI_FUNCTION_TRACE(ex_do_logical_op);
+
+ /*
+ * Convert the second operand if necessary. The first operand
+ * determines the type of the second operand, (See the Data Types
+ * section of the ACPI 3.0+ specification.) Both object types are
+ * guaranteed to be either Integer/String/Buffer by the operand
+ * resolution mechanism.
+ */
+ switch (operand0->common.type) {
+ case ACPI_TYPE_INTEGER:
+
+ status =
+ acpi_ex_convert_to_integer(operand1, &local_operand1, 16);
+ break;
+
+ case ACPI_TYPE_STRING:
+
+ status = acpi_ex_convert_to_string(operand1, &local_operand1,
+ ACPI_IMPLICIT_CONVERT_HEX);
+ break;
+
+ case ACPI_TYPE_BUFFER:
+
+ status = acpi_ex_convert_to_buffer(operand1, &local_operand1);
+ break;
+
+ default:
+
+ status = AE_AML_INTERNAL;
+ break;
+ }
+
+ if (ACPI_FAILURE(status)) {
+ goto cleanup;
+ }
+
+ /*
+ * Two cases: 1) Both Integers, 2) Both Strings or Buffers
+ */
+ if (operand0->common.type == ACPI_TYPE_INTEGER) {
+ /*
+ * 1) Both operands are of type integer
+ * Note: local_operand1 may have changed above
+ */
+ integer0 = operand0->integer.value;
+ integer1 = local_operand1->integer.value;
+
+ switch (opcode) {
+ case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
+
+ if (integer0 == integer1) {
+ local_result = TRUE;
+ }
+ break;
+
+ case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
+
+ if (integer0 > integer1) {
+ local_result = TRUE;
+ }
+ break;
+
+ case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
+
+ if (integer0 < integer1) {
+ local_result = TRUE;
+ }
+ break;
+
+ default:
+
+ status = AE_AML_INTERNAL;
+ break;
+ }
+ } else {
+ /*
+ * 2) Both operands are Strings or both are Buffers
+ * Note: Code below takes advantage of common Buffer/String
+ * object fields. local_operand1 may have changed above. Use
+ * memcmp to handle nulls in buffers.
+ */
+ length0 = operand0->buffer.length;
+ length1 = local_operand1->buffer.length;
+
+ /* Lexicographic compare: compare the data bytes */
+
+ compare = ACPI_MEMCMP(operand0->buffer.pointer,
+ local_operand1->buffer.pointer,
+ (length0 > length1) ? length1 : length0);
+
+ switch (opcode) {
+ case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */
+
+ /* Length and all bytes must be equal */
+
+ if ((length0 == length1) && (compare == 0)) {
+
+ /* Length and all bytes match ==> TRUE */
+
+ local_result = TRUE;
+ }
+ break;
+
+ case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */
+
+ if (compare > 0) {
+ local_result = TRUE;
+ goto cleanup; /* TRUE */
+ }
+ if (compare < 0) {
+ goto cleanup; /* FALSE */
+ }
+
+ /* Bytes match (to shortest length), compare lengths */
+
+ if (length0 > length1) {
+ local_result = TRUE;
+ }
+ break;
+
+ case AML_LLESS_OP: /* LLess (Operand0, Operand1) */
+
+ if (compare > 0) {
+ goto cleanup; /* FALSE */
+ }
+ if (compare < 0) {
+ local_result = TRUE;
+ goto cleanup; /* TRUE */
+ }
+
+ /* Bytes match (to shortest length), compare lengths */
+
+ if (length0 < length1) {
+ local_result = TRUE;
+ }
+ break;
+
+ default:
+
+ status = AE_AML_INTERNAL;
+ break;
+ }
+ }
+
+cleanup:
+
+ /* New object was created if implicit conversion performed - delete */
+
+ if (local_operand1 != operand1) {
+ acpi_ut_remove_reference(local_operand1);
+ }
+
+ /* Return the logical result and status */
+
+ *logical_result = local_result;
+ return_ACPI_STATUS(status);
+}
Code Review / kvmfornfv.git / blobdiff