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exmisc.c

/******************************************************************************
 *
 * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes
 *
 *****************************************************************************/

/*
 * Copyright (C) 2000 - 2007, R. Byron Moore
 * 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 <acpi/acinterp.h>
#include <acpi/amlcode.h>
#include <acpi/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 (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) {
                  return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
            }

            /*
             * Must be a reference to a Local or Arg
             */
            switch (obj_desc->reference.opcode) {
            case AML_LOCAL_OP:
            case AML_ARG_OP:
            case AML_DEBUG_OP:

                  /* 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 opcode %X",
                            obj_desc->reference.opcode));
                  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 %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.opcode = AML_REF_OF_OP;
      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 (ACPI_GET_OBJECT_TYPE(operand0)) {
      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: %X",
                      ACPI_GET_OBJECT_TYPE(operand0)));
            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 (ACPI_GET_OBJECT_TYPE(operand0)) {
      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: %X",
                      ACPI_GET_OBJECT_TYPE(operand0)));
            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.
 *
 ******************************************************************************/

acpi_integer
acpi_ex_do_math_op(u16 opcode, acpi_integer integer0, acpi_integer 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,
                        acpi_integer integer0,
                        acpi_integer 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;
      acpi_integer integer0;
      acpi_integer 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 (ACPI_GET_OBJECT_TYPE(operand0)) {
      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 (ACPI_GET_OBJECT_TYPE(operand0) == 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);
}

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