psargs.c
上传用户:lgb322
上传日期:2013-02-24
资源大小:30529k
文件大小:17k
- /******************************************************************************
- *
- * Module Name: psargs - Parse AML opcode arguments
- * $Revision: 52 $
- *
- *****************************************************************************/
- /*
- * Copyright (C) 2000, 2001 R. Byron Moore
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
- #include "acpi.h"
- #include "acparser.h"
- #include "amlcode.h"
- #include "acnamesp.h"
- #define _COMPONENT ACPI_PARSER
- MODULE_NAME ("psargs")
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ps_get_next_package_length
- *
- * PARAMETERS: Parser_state - Current parser state object
- *
- * RETURN: Decoded package length. On completion, the AML pointer points
- * past the length byte or bytes.
- *
- * DESCRIPTION: Decode and return a package length field
- *
- ******************************************************************************/
- u32
- acpi_ps_get_next_package_length (
- acpi_parse_state *parser_state)
- {
- u32 encoded_length;
- u32 length = 0;
- FUNCTION_TRACE ("Ps_get_next_package_length");
- encoded_length = (u32) GET8 (parser_state->aml);
- parser_state->aml++;
- switch (encoded_length >> 6) /* bits 6-7 contain encoding scheme */ {
- case 0: /* 1-byte encoding (bits 0-5) */
- length = (encoded_length & 0x3F);
- break;
- case 1: /* 2-byte encoding (next byte + bits 0-3) */
- length = ((GET8 (parser_state->aml) << 04) |
- (encoded_length & 0x0F));
- parser_state->aml++;
- break;
- case 2: /* 3-byte encoding (next 2 bytes + bits 0-3) */
- length = ((GET8 (parser_state->aml + 1) << 12) |
- (GET8 (parser_state->aml) << 04) |
- (encoded_length & 0x0F));
- parser_state->aml += 2;
- break;
- case 3: /* 4-byte encoding (next 3 bytes + bits 0-3) */
- length = ((GET8 (parser_state->aml + 2) << 20) |
- (GET8 (parser_state->aml + 1) << 12) |
- (GET8 (parser_state->aml) << 04) |
- (encoded_length & 0x0F));
- parser_state->aml += 3;
- break;
- }
- return_VALUE (length);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ps_get_next_package_end
- *
- * PARAMETERS: Parser_state - Current parser state object
- *
- * RETURN: Pointer to end-of-package +1
- *
- * DESCRIPTION: Get next package length and return a pointer past the end of
- * the package. Consumes the package length field
- *
- ******************************************************************************/
- u8 *
- acpi_ps_get_next_package_end (
- acpi_parse_state *parser_state)
- {
- u8 *start = parser_state->aml;
- NATIVE_UINT length;
- FUNCTION_TRACE ("Ps_get_next_package_end");
- length = (NATIVE_UINT) acpi_ps_get_next_package_length (parser_state);
- return_PTR (start + length); /* end of package */
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ps_get_next_namestring
- *
- * PARAMETERS: Parser_state - Current parser state object
- *
- * RETURN: Pointer to the start of the name string (pointer points into
- * the AML.
- *
- * DESCRIPTION: Get next raw namestring within the AML stream. Handles all name
- * prefix characters. Set parser state to point past the string.
- * (Name is consumed from the AML.)
- *
- ******************************************************************************/
- NATIVE_CHAR *
- acpi_ps_get_next_namestring (
- acpi_parse_state *parser_state)
- {
- u8 *start = parser_state->aml;
- u8 *end = parser_state->aml;
- u32 length;
- FUNCTION_TRACE ("Ps_get_next_namestring");
- /* Handle multiple prefix characters */
- while (acpi_ps_is_prefix_char (GET8 (end))) {
- /* include prefix '\' or '^' */
- end++;
- }
- /* Decode the path */
- switch (GET8 (end)) {
- case 0:
- /* Null_name */
- if (end == start) {
- start = NULL;
- }
- end++;
- break;
- case AML_DUAL_NAME_PREFIX:
- /* two name segments */
- end += 9;
- break;
- case AML_MULTI_NAME_PREFIX_OP:
- /* multiple name segments */
- length = (u32) GET8 (end + 1) * 4;
- end += 2 + length;
- break;
- default:
- /* single name segment */
- /* assert (Acpi_ps_is_lead (GET8 (End))); */
- end += 4;
- break;
- }
- parser_state->aml = (u8*) end;
- return_PTR ((NATIVE_CHAR *) start);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ps_get_next_namepath
- *
- * PARAMETERS: Parser_state - Current parser state object
- * Arg - Where the namepath will be stored
- * Arg_count - If the namepath points to a control method
- * the method's argument is returned here.
- * Method_call - Whether the namepath can be the start
- * of a method call
- *
- * RETURN: None
- *
- * DESCRIPTION: Get next name (if method call, push appropriate # args). Names
- * are looked up in either the parsed or internal namespace to
- * determine if the name represents a control method. If a method
- * is found, the number of arguments to the method is returned.
- * This information is critical for parsing to continue correctly.
- *
- ******************************************************************************/
- #ifdef PARSER_ONLY
- void
- acpi_ps_get_next_namepath (
- acpi_parse_state *parser_state,
- acpi_parse_object *arg,
- u32 *arg_count,
- u8 method_call)
- {
- NATIVE_CHAR *path;
- acpi_parse_object *name_op;
- acpi_parse_object *op;
- acpi_parse_object *count;
- FUNCTION_TRACE ("Ps_get_next_namepath");
- path = acpi_ps_get_next_namestring (parser_state);
- if (!path || !method_call) {
- /* Null name case, create a null namepath object */
- acpi_ps_init_op (arg, AML_INT_NAMEPATH_OP);
- arg->value.name = path;
- return_VOID;
- }
- if (acpi_gbl_parsed_namespace_root) {
- /*
- * Lookup the name in the parsed namespace
- */
- op = NULL;
- if (method_call) {
- op = acpi_ps_find (acpi_ps_get_parent_scope (parser_state),
- path, AML_METHOD_OP, 0);
- }
- if (op) {
- if (op->opcode == AML_METHOD_OP) {
- /*
- * The name refers to a control method, so this namepath is a
- * method invocation. We need to 1) Get the number of arguments
- * associated with this method, and 2) Change the NAMEPATH
- * object into a METHODCALL object.
- */
- count = acpi_ps_get_arg (op, 0);
- if (count && count->opcode == AML_BYTE_OP) {
- name_op = acpi_ps_alloc_op (AML_INT_NAMEPATH_OP);
- if (name_op) {
- /* Change arg into a METHOD CALL and attach the name */
- acpi_ps_init_op (arg, AML_INT_METHODCALL_OP);
- name_op->value.name = path;
- /* Point METHODCALL/NAME to the METHOD Node */
- name_op->node = (acpi_namespace_node *) op;
- acpi_ps_append_arg (arg, name_op);
- *arg_count = (u32) count->value.integer &
- METHOD_FLAGS_ARG_COUNT;
- }
- }
- return_VOID;
- }
- /*
- * Else this is normal named object reference.
- * Just init the NAMEPATH object with the pathname.
- * (See code below)
- */
- }
- }
- /*
- * Either we didn't find the object in the namespace, or the object is
- * something other than a control method. Just initialize the Op with the
- * pathname
- */
- acpi_ps_init_op (arg, AML_INT_NAMEPATH_OP);
- arg->value.name = path;
- return_VOID;
- }
- #else
- void
- acpi_ps_get_next_namepath (
- acpi_parse_state *parser_state,
- acpi_parse_object *arg,
- u32 *arg_count,
- u8 method_call)
- {
- NATIVE_CHAR *path;
- acpi_parse_object *name_op;
- acpi_status status;
- acpi_namespace_node *method_node = NULL;
- acpi_namespace_node *node;
- acpi_generic_state scope_info;
- FUNCTION_TRACE ("Ps_get_next_namepath");
- path = acpi_ps_get_next_namestring (parser_state);
- if (!path || !method_call) {
- /* Null name case, create a null namepath object */
- acpi_ps_init_op (arg, AML_INT_NAMEPATH_OP);
- arg->value.name = path;
- return_VOID;
- }
- if (method_call) {
- /*
- * Lookup the name in the internal namespace
- */
- scope_info.scope.node = NULL;
- node = parser_state->start_node;
- if (node) {
- scope_info.scope.node = node;
- }
- /*
- * Lookup object. We don't want to add anything new to the namespace
- * here, however. So we use MODE_EXECUTE. Allow searching of the
- * parent tree, but don't open a new scope -- we just want to lookup the
- * object (MUST BE mode EXECUTE to perform upsearch)
- */
- status = acpi_ns_lookup (&scope_info, path, ACPI_TYPE_ANY, IMODE_EXECUTE,
- NS_SEARCH_PARENT | NS_DONT_OPEN_SCOPE, NULL,
- &node);
- if (ACPI_SUCCESS (status)) {
- if (node->type == ACPI_TYPE_METHOD) {
- method_node = node;
- ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "method - %p Path=%pn",
- method_node, path));
- name_op = acpi_ps_alloc_op (AML_INT_NAMEPATH_OP);
- if (name_op) {
- /* Change arg into a METHOD CALL and attach name to it */
- acpi_ps_init_op (arg, AML_INT_METHODCALL_OP);
- name_op->value.name = path;
- /* Point METHODCALL/NAME to the METHOD Node */
- name_op->node = method_node;
- acpi_ps_append_arg (arg, name_op);
- if (!method_node->object) {
- return_VOID;
- }
- *arg_count = (method_node->object)->method.param_count;
- }
- return_VOID;
- }
- /*
- * Else this is normal named object reference.
- * Just init the NAMEPATH object with the pathname.
- * (See code below)
- */
- }
- }
- /*
- * Either we didn't find the object in the namespace, or the object is
- * something other than a control method. Just initialize the Op with the
- * pathname.
- */
- acpi_ps_init_op (arg, AML_INT_NAMEPATH_OP);
- arg->value.name = path;
- return_VOID;
- }
- #endif
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ps_get_next_simple_arg
- *
- * PARAMETERS: Parser_state - Current parser state object
- * Arg_type - The argument type (AML_*_ARG)
- * Arg - Where the argument is returned
- *
- * RETURN: None
- *
- * DESCRIPTION: Get the next simple argument (constant, string, or namestring)
- *
- ******************************************************************************/
- void
- acpi_ps_get_next_simple_arg (
- acpi_parse_state *parser_state,
- u32 arg_type,
- acpi_parse_object *arg)
- {
- FUNCTION_TRACE_U32 ("Ps_get_next_simple_arg", arg_type);
- switch (arg_type) {
- case ARGP_BYTEDATA:
- acpi_ps_init_op (arg, AML_BYTE_OP);
- arg->value.integer = (u32) GET8 (parser_state->aml);
- parser_state->aml++;
- break;
- case ARGP_WORDDATA:
- acpi_ps_init_op (arg, AML_WORD_OP);
- /* Get 2 bytes from the AML stream */
- MOVE_UNALIGNED16_TO_32 (&arg->value.integer, parser_state->aml);
- parser_state->aml += 2;
- break;
- case ARGP_DWORDDATA:
- acpi_ps_init_op (arg, AML_DWORD_OP);
- /* Get 4 bytes from the AML stream */
- MOVE_UNALIGNED32_TO_32 (&arg->value.integer, parser_state->aml);
- parser_state->aml += 4;
- break;
- case ARGP_QWORDDATA:
- acpi_ps_init_op (arg, AML_QWORD_OP);
- /* Get 8 bytes from the AML stream */
- MOVE_UNALIGNED64_TO_64 (&arg->value.integer, parser_state->aml);
- parser_state->aml += 8;
- break;
- case ARGP_CHARLIST:
- acpi_ps_init_op (arg, AML_STRING_OP);
- arg->value.string = (char*) parser_state->aml;
- while (GET8 (parser_state->aml) != ' ') {
- parser_state->aml++;
- }
- parser_state->aml++;
- break;
- case ARGP_NAME:
- case ARGP_NAMESTRING:
- acpi_ps_init_op (arg, AML_INT_NAMEPATH_OP);
- arg->value.name = acpi_ps_get_next_namestring (parser_state);
- break;
- }
- return_VOID;
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ps_get_next_field
- *
- * PARAMETERS: Parser_state - Current parser state object
- *
- * RETURN: A newly allocated FIELD op
- *
- * DESCRIPTION: Get next field (Named_field, Reserved_field, or Access_field)
- *
- ******************************************************************************/
- acpi_parse_object *
- acpi_ps_get_next_field (
- acpi_parse_state *parser_state)
- {
- u32 aml_offset = parser_state->aml -
- parser_state->aml_start;
- acpi_parse_object *field;
- u16 opcode;
- u32 name;
- FUNCTION_TRACE ("Ps_get_next_field");
- /* determine field type */
- switch (GET8 (parser_state->aml)) {
- default:
- opcode = AML_INT_NAMEDFIELD_OP;
- break;
- case 0x00:
- opcode = AML_INT_RESERVEDFIELD_OP;
- parser_state->aml++;
- break;
- case 0x01:
- opcode = AML_INT_ACCESSFIELD_OP;
- parser_state->aml++;
- break;
- }
- /* Allocate a new field op */
- field = acpi_ps_alloc_op (opcode);
- if (field) {
- field->aml_offset = aml_offset;
- /* Decode the field type */
- switch (opcode) {
- case AML_INT_NAMEDFIELD_OP:
- /* Get the 4-character name */
- MOVE_UNALIGNED32_TO_32 (&name, parser_state->aml);
- acpi_ps_set_name (field, name);
- parser_state->aml += 4;
- /* Get the length which is encoded as a package length */
- field->value.size = acpi_ps_get_next_package_length (parser_state);
- break;
- case AML_INT_RESERVEDFIELD_OP:
- /* Get the length which is encoded as a package length */
- field->value.size = acpi_ps_get_next_package_length (parser_state);
- break;
- case AML_INT_ACCESSFIELD_OP:
- /* Get Access_type and Access_atrib and merge into the field Op */
- field->value.integer = ((GET8 (parser_state->aml) << 8) |
- GET8 (parser_state->aml));
- parser_state->aml += 2;
- break;
- }
- }
- return_PTR (field);
- }
- /*******************************************************************************
- *
- * FUNCTION: Acpi_ps_get_next_arg
- *
- * PARAMETERS: Parser_state - Current parser state object
- * Arg_type - The argument type (AML_*_ARG)
- * Arg_count - If the argument points to a control method
- * the method's argument is returned here.
- *
- * RETURN: An op object containing the next argument.
- *
- * DESCRIPTION: Get next argument (including complex list arguments that require
- * pushing the parser stack)
- *
- ******************************************************************************/
- acpi_parse_object *
- acpi_ps_get_next_arg (
- acpi_parse_state *parser_state,
- u32 arg_type,
- u32 *arg_count)
- {
- acpi_parse_object *arg = NULL;
- acpi_parse_object *prev = NULL;
- acpi_parse_object *field;
- u32 subop;
- FUNCTION_TRACE_PTR ("Ps_get_next_arg", parser_state);
- switch (arg_type) {
- case ARGP_BYTEDATA:
- case ARGP_WORDDATA:
- case ARGP_DWORDDATA:
- case ARGP_CHARLIST:
- case ARGP_NAME:
- case ARGP_NAMESTRING:
- /* constants, strings, and namestrings are all the same size */
- arg = acpi_ps_alloc_op (AML_BYTE_OP);
- if (arg) {
- acpi_ps_get_next_simple_arg (parser_state, arg_type, arg);
- }
- break;
- case ARGP_PKGLENGTH:
- /* package length, nothing returned */
- parser_state->pkg_end = acpi_ps_get_next_package_end (parser_state);
- break;
- case ARGP_FIELDLIST:
- if (parser_state->aml < parser_state->pkg_end) {
- /* non-empty list */
- while (parser_state->aml < parser_state->pkg_end) {
- field = acpi_ps_get_next_field (parser_state);
- if (!field) {
- break;
- }
- if (prev) {
- prev->next = field;
- }
- else {
- arg = field;
- }
- prev = field;
- }
- /* skip to End of byte data */
- parser_state->aml = parser_state->pkg_end;
- }
- break;
- case ARGP_BYTELIST:
- if (parser_state->aml < parser_state->pkg_end) {
- /* non-empty list */
- arg = acpi_ps_alloc_op (AML_INT_BYTELIST_OP);
- if (arg) {
- /* fill in bytelist data */
- arg->value.size = (parser_state->pkg_end - parser_state->aml);
- ((acpi_parse2_object *) arg)->data = parser_state->aml;
- }
- /* skip to End of byte data */
- parser_state->aml = parser_state->pkg_end;
- }
- break;
- case ARGP_TARGET:
- case ARGP_SUPERNAME: {
- subop = acpi_ps_peek_opcode (parser_state);
- if (subop == 0 ||
- acpi_ps_is_leading_char (subop) ||
- acpi_ps_is_prefix_char (subop)) {
- /* Null_name or Name_string */
- arg = acpi_ps_alloc_op (AML_INT_NAMEPATH_OP);
- if (arg) {
- acpi_ps_get_next_namepath (parser_state, arg, arg_count, 0);
- }
- }
- else {
- /* single complex argument, nothing returned */
- *arg_count = 1;
- }
- }
- break;
- case ARGP_DATAOBJ:
- case ARGP_TERMARG:
- /* single complex argument, nothing returned */
- *arg_count = 1;
- break;
- case ARGP_DATAOBJLIST:
- case ARGP_TERMLIST:
- case ARGP_OBJLIST:
- if (parser_state->aml < parser_state->pkg_end) {
- /* non-empty list of variable arguments, nothing returned */
- *arg_count = ACPI_VAR_ARGS;
- }
- break;
- }
- return_PTR (arg);
- }