714 строки
18 KiB
C
714 строки
18 KiB
C
/******************************************************************************
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*
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* Module Name: psargs - Parse AML opcode arguments
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2005, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include <acpi/acparser.h>
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#include <acpi/amlcode.h>
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#include <acpi/acnamesp.h>
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#define _COMPONENT ACPI_PARSER
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ACPI_MODULE_NAME("psargs")
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/* Local prototypes */
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static u32
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acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state);
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static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
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*parser_state);
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_next_package_length
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: Decoded package length. On completion, the AML pointer points
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* past the length byte or bytes.
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*
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* DESCRIPTION: Decode and return a package length field
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*
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******************************************************************************/
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static u32
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acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state)
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{
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u32 encoded_length;
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u32 length = 0;
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ACPI_FUNCTION_TRACE("ps_get_next_package_length");
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encoded_length = (u32) ACPI_GET8(parser_state->aml);
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parser_state->aml++;
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switch (encoded_length >> 6) { /* bits 6-7 contain encoding scheme */
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case 0: /* 1-byte encoding (bits 0-5) */
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length = (encoded_length & 0x3F);
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break;
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case 1: /* 2-byte encoding (next byte + bits 0-3) */
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length = ((ACPI_GET8(parser_state->aml) << 04) |
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(encoded_length & 0x0F));
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parser_state->aml++;
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break;
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case 2: /* 3-byte encoding (next 2 bytes + bits 0-3) */
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length = ((ACPI_GET8(parser_state->aml + 1) << 12) |
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(ACPI_GET8(parser_state->aml) << 04) |
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(encoded_length & 0x0F));
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parser_state->aml += 2;
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break;
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case 3: /* 4-byte encoding (next 3 bytes + bits 0-3) */
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length = ((ACPI_GET8(parser_state->aml + 2) << 20) |
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(ACPI_GET8(parser_state->aml + 1) << 12) |
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(ACPI_GET8(parser_state->aml) << 04) |
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(encoded_length & 0x0F));
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parser_state->aml += 3;
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break;
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default:
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/* Can't get here, only 2 bits / 4 cases */
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break;
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}
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return_VALUE(length);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_next_package_end
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: Pointer to end-of-package +1
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*
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* DESCRIPTION: Get next package length and return a pointer past the end of
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* the package. Consumes the package length field
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*
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******************************************************************************/
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u8 *acpi_ps_get_next_package_end(struct acpi_parse_state *parser_state)
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{
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u8 *start = parser_state->aml;
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acpi_native_uint length;
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ACPI_FUNCTION_TRACE("ps_get_next_package_end");
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/* Function below changes parser_state->Aml */
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length =
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(acpi_native_uint) acpi_ps_get_next_package_length(parser_state);
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return_PTR(start + length); /* end of package */
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_next_namestring
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: Pointer to the start of the name string (pointer points into
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* the AML.
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*
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* DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
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* prefix characters. Set parser state to point past the string.
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* (Name is consumed from the AML.)
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*
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******************************************************************************/
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char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state)
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{
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u8 *start = parser_state->aml;
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u8 *end = parser_state->aml;
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ACPI_FUNCTION_TRACE("ps_get_next_namestring");
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/* Handle multiple prefix characters */
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while (acpi_ps_is_prefix_char(ACPI_GET8(end))) {
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/* Include prefix '\\' or '^' */
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end++;
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}
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/* Decode the path */
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switch (ACPI_GET8(end)) {
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case 0:
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/* null_name */
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if (end == start) {
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start = NULL;
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}
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end++;
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break;
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case AML_DUAL_NAME_PREFIX:
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/* Two name segments */
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end += 1 + (2 * ACPI_NAME_SIZE);
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break;
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case AML_MULTI_NAME_PREFIX_OP:
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/* Multiple name segments, 4 chars each */
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end += 2 + ((acpi_size) ACPI_GET8(end + 1) * ACPI_NAME_SIZE);
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break;
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default:
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/* Single name segment */
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end += ACPI_NAME_SIZE;
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break;
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}
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parser_state->aml = (u8 *) end;
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return_PTR((char *)start);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_next_namepath
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*
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* PARAMETERS: parser_state - Current parser state object
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* Arg - Where the namepath will be stored
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* arg_count - If the namepath points to a control method
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* the method's argument is returned here.
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* method_call - Whether the namepath can possibly be the
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* start of a method call
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*
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* RETURN: Status
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*
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* DESCRIPTION: Get next name (if method call, return # of required args).
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* Names are looked up in the internal namespace to determine
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* if the name represents a control method. If a method
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* is found, the number of arguments to the method is returned.
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* This information is critical for parsing to continue correctly.
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*
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******************************************************************************/
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acpi_status
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acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state,
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struct acpi_parse_state *parser_state,
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union acpi_parse_object *arg, u8 method_call)
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{
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char *path;
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union acpi_parse_object *name_op;
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acpi_status status = AE_OK;
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union acpi_operand_object *method_desc;
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struct acpi_namespace_node *node;
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union acpi_generic_state scope_info;
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ACPI_FUNCTION_TRACE("ps_get_next_namepath");
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path = acpi_ps_get_next_namestring(parser_state);
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/* Null path case is allowed */
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if (path) {
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/*
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* Lookup the name in the internal namespace
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*/
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scope_info.scope.node = NULL;
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node = parser_state->start_node;
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if (node) {
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scope_info.scope.node = node;
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}
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/*
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* Lookup object. We don't want to add anything new to the namespace
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* here, however. So we use MODE_EXECUTE. Allow searching of the
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* parent tree, but don't open a new scope -- we just want to lookup the
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* object (MUST BE mode EXECUTE to perform upsearch)
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*/
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status = acpi_ns_lookup(&scope_info, path, ACPI_TYPE_ANY,
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ACPI_IMODE_EXECUTE,
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ACPI_NS_SEARCH_PARENT |
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ACPI_NS_DONT_OPEN_SCOPE, NULL, &node);
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if (ACPI_SUCCESS(status) && method_call) {
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if (node->type == ACPI_TYPE_METHOD) {
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/* This name is actually a control method invocation */
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method_desc = acpi_ns_get_attached_object(node);
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
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"Control Method - %p Desc %p Path=%p\n",
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node, method_desc, path));
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name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
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if (!name_op) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Change arg into a METHOD CALL and attach name to it */
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acpi_ps_init_op(arg, AML_INT_METHODCALL_OP);
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name_op->common.value.name = path;
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/* Point METHODCALL/NAME to the METHOD Node */
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name_op->common.node = node;
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acpi_ps_append_arg(arg, name_op);
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if (!method_desc) {
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ACPI_REPORT_ERROR(("ps_get_next_namepath: Control Method %p has no attached object\n", node));
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return_ACPI_STATUS(AE_AML_INTERNAL);
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}
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ACPI_DEBUG_PRINT((ACPI_DB_PARSE,
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"Control Method - %p Args %X\n",
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node,
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method_desc->method.
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param_count));
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/* Get the number of arguments to expect */
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walk_state->arg_count =
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method_desc->method.param_count;
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return_ACPI_STATUS(AE_OK);
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}
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/*
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* Else this is normal named object reference.
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* Just init the NAMEPATH object with the pathname.
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* (See code below)
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*/
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}
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if (ACPI_FAILURE(status)) {
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/*
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* 1) Any error other than NOT_FOUND is always severe
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* 2) NOT_FOUND is only important if we are executing a method.
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* 3) If executing a cond_ref_of opcode, NOT_FOUND is ok.
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*/
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if ((((walk_state->
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parse_flags & ACPI_PARSE_MODE_MASK) ==
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ACPI_PARSE_EXECUTE) && (status == AE_NOT_FOUND)
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&& (walk_state->op->common.aml_opcode !=
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AML_COND_REF_OF_OP))
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|| (status != AE_NOT_FOUND)) {
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ACPI_REPORT_NSERROR(path, status);
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acpi_os_printf
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("search_node %p start_node %p return_node %p\n",
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scope_info.scope.node,
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parser_state->start_node, node);
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} else {
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/*
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* We got a NOT_FOUND during table load or we encountered
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* a cond_ref_of(x) where the target does not exist.
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* Either case is ok
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*/
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status = AE_OK;
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}
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}
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}
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/*
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* Regardless of success/failure above,
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* Just initialize the Op with the pathname.
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*/
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acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
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arg->common.value.name = path;
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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_ps_get_next_simple_arg
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*
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* PARAMETERS: parser_state - Current parser state object
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* arg_type - The argument type (AML_*_ARG)
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* Arg - Where the argument is returned
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*
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* RETURN: None
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*
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* DESCRIPTION: Get the next simple argument (constant, string, or namestring)
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*
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******************************************************************************/
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void
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acpi_ps_get_next_simple_arg(struct acpi_parse_state *parser_state,
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u32 arg_type, union acpi_parse_object *arg)
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{
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ACPI_FUNCTION_TRACE_U32("ps_get_next_simple_arg", arg_type);
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switch (arg_type) {
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case ARGP_BYTEDATA:
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acpi_ps_init_op(arg, AML_BYTE_OP);
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arg->common.value.integer = (u32) ACPI_GET8(parser_state->aml);
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parser_state->aml++;
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break;
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case ARGP_WORDDATA:
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acpi_ps_init_op(arg, AML_WORD_OP);
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/* Get 2 bytes from the AML stream */
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ACPI_MOVE_16_TO_32(&arg->common.value.integer,
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parser_state->aml);
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parser_state->aml += 2;
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break;
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case ARGP_DWORDDATA:
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acpi_ps_init_op(arg, AML_DWORD_OP);
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/* Get 4 bytes from the AML stream */
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ACPI_MOVE_32_TO_32(&arg->common.value.integer,
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parser_state->aml);
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parser_state->aml += 4;
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break;
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case ARGP_QWORDDATA:
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acpi_ps_init_op(arg, AML_QWORD_OP);
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/* Get 8 bytes from the AML stream */
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ACPI_MOVE_64_TO_64(&arg->common.value.integer,
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parser_state->aml);
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parser_state->aml += 8;
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break;
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case ARGP_CHARLIST:
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acpi_ps_init_op(arg, AML_STRING_OP);
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arg->common.value.string = (char *)parser_state->aml;
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while (ACPI_GET8(parser_state->aml) != '\0') {
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parser_state->aml++;
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}
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parser_state->aml++;
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break;
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case ARGP_NAME:
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case ARGP_NAMESTRING:
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acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
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arg->common.value.name =
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acpi_ps_get_next_namestring(parser_state);
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break;
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default:
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ACPI_REPORT_ERROR(("Invalid arg_type %X\n", arg_type));
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break;
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}
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return_VOID;
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_next_field
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*
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* PARAMETERS: parser_state - Current parser state object
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*
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* RETURN: A newly allocated FIELD op
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*
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* DESCRIPTION: Get next field (named_field, reserved_field, or access_field)
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*
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******************************************************************************/
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static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state
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*parser_state)
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{
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u32 aml_offset = (u32)
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ACPI_PTR_DIFF(parser_state->aml,
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parser_state->aml_start);
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union acpi_parse_object *field;
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u16 opcode;
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u32 name;
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ACPI_FUNCTION_TRACE("ps_get_next_field");
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/* Determine field type */
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switch (ACPI_GET8(parser_state->aml)) {
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default:
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opcode = AML_INT_NAMEDFIELD_OP;
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break;
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case 0x00:
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opcode = AML_INT_RESERVEDFIELD_OP;
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parser_state->aml++;
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break;
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case 0x01:
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opcode = AML_INT_ACCESSFIELD_OP;
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parser_state->aml++;
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break;
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}
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/* Allocate a new field op */
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field = acpi_ps_alloc_op(opcode);
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if (!field) {
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return_PTR(NULL);
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}
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field->common.aml_offset = aml_offset;
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/* Decode the field type */
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switch (opcode) {
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case AML_INT_NAMEDFIELD_OP:
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/* Get the 4-character name */
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ACPI_MOVE_32_TO_32(&name, parser_state->aml);
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acpi_ps_set_name(field, name);
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parser_state->aml += ACPI_NAME_SIZE;
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/* Get the length which is encoded as a package length */
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field->common.value.size =
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acpi_ps_get_next_package_length(parser_state);
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break;
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case AML_INT_RESERVEDFIELD_OP:
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/* Get the length which is encoded as a package length */
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field->common.value.size =
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acpi_ps_get_next_package_length(parser_state);
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break;
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case AML_INT_ACCESSFIELD_OP:
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/*
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* Get access_type and access_attrib and merge into the field Op
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* access_type is first operand, access_attribute is second
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*/
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field->common.value.integer =
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(ACPI_GET8(parser_state->aml) << 8);
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parser_state->aml++;
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field->common.value.integer |= ACPI_GET8(parser_state->aml);
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parser_state->aml++;
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break;
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default:
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/* Opcode was set in previous switch */
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break;
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}
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return_PTR(field);
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_ps_get_next_arg
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*
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* PARAMETERS: walk_state - Current state
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* parser_state - Current parser state object
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* arg_type - The argument type (AML_*_ARG)
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* return_arg - Where the next arg is returned
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*
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* RETURN: Status, and an op object containing the next argument.
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*
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* DESCRIPTION: Get next argument (including complex list arguments that require
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* pushing the parser stack)
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*
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******************************************************************************/
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acpi_status
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acpi_ps_get_next_arg(struct acpi_walk_state *walk_state,
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struct acpi_parse_state *parser_state,
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u32 arg_type, union acpi_parse_object **return_arg)
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{
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union acpi_parse_object *arg = NULL;
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union acpi_parse_object *prev = NULL;
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union acpi_parse_object *field;
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u32 subop;
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acpi_status status = AE_OK;
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ACPI_FUNCTION_TRACE_PTR("ps_get_next_arg", parser_state);
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switch (arg_type) {
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case ARGP_BYTEDATA:
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case ARGP_WORDDATA:
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case ARGP_DWORDDATA:
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case ARGP_CHARLIST:
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case ARGP_NAME:
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case ARGP_NAMESTRING:
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/* Constants, strings, and namestrings are all the same size */
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arg = acpi_ps_alloc_op(AML_BYTE_OP);
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if (!arg) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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acpi_ps_get_next_simple_arg(parser_state, arg_type, arg);
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break;
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case ARGP_PKGLENGTH:
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/* Package length, nothing returned */
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parser_state->pkg_end =
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acpi_ps_get_next_package_end(parser_state);
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break;
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case ARGP_FIELDLIST:
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if (parser_state->aml < parser_state->pkg_end) {
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/* Non-empty list */
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while (parser_state->aml < parser_state->pkg_end) {
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field = acpi_ps_get_next_field(parser_state);
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if (!field) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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if (prev) {
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prev->common.next = field;
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} else {
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arg = field;
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}
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prev = field;
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}
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/* Skip to End of byte data */
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parser_state->aml = parser_state->pkg_end;
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}
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break;
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case ARGP_BYTELIST:
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if (parser_state->aml < parser_state->pkg_end) {
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/* Non-empty list */
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arg = acpi_ps_alloc_op(AML_INT_BYTELIST_OP);
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if (!arg) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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/* Fill in bytelist data */
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arg->common.value.size = (u32)
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ACPI_PTR_DIFF(parser_state->pkg_end,
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parser_state->aml);
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arg->named.data = parser_state->aml;
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/* Skip to End of byte data */
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parser_state->aml = parser_state->pkg_end;
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}
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break;
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case ARGP_TARGET:
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case ARGP_SUPERNAME:
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case ARGP_SIMPLENAME:
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subop = acpi_ps_peek_opcode(parser_state);
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if (subop == 0 ||
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acpi_ps_is_leading_char(subop) ||
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acpi_ps_is_prefix_char(subop)) {
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/* null_name or name_string */
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arg = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP);
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if (!arg) {
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return_ACPI_STATUS(AE_NO_MEMORY);
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}
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status =
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acpi_ps_get_next_namepath(walk_state, parser_state,
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arg, 0);
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} else {
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/* Single complex argument, nothing returned */
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walk_state->arg_count = 1;
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}
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break;
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case ARGP_DATAOBJ:
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case ARGP_TERMARG:
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/* Single complex argument, nothing returned */
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walk_state->arg_count = 1;
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break;
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case ARGP_DATAOBJLIST:
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case ARGP_TERMLIST:
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case ARGP_OBJLIST:
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if (parser_state->aml < parser_state->pkg_end) {
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/* Non-empty list of variable arguments, nothing returned */
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walk_state->arg_count = ACPI_VAR_ARGS;
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}
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break;
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default:
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ACPI_REPORT_ERROR(("Invalid arg_type: %X\n", arg_type));
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status = AE_AML_OPERAND_TYPE;
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break;
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}
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*return_arg = arg;
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return_ACPI_STATUS(status);
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}
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