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Diffstat (limited to 'drivers/acpi/parser/psscope.c')
| -rw-r--r-- | drivers/acpi/parser/psscope.c | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/drivers/acpi/parser/psscope.c b/drivers/acpi/parser/psscope.c new file mode 100644 index 00000000000..dcbed49608b --- /dev/null +++ b/drivers/acpi/parser/psscope.c @@ -0,0 +1,290 @@ +/****************************************************************************** + * + * Module Name: psscope - Parser scope stack management routines + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2005, 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/acparser.h> + +#define _COMPONENT ACPI_PARSER + ACPI_MODULE_NAME ("psscope") + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_get_parent_scope + * + * PARAMETERS: parser_state - Current parser state object + * + * RETURN: Pointer to an Op object + * + * DESCRIPTION: Get parent of current op being parsed + * + ******************************************************************************/ + +union acpi_parse_object * +acpi_ps_get_parent_scope ( + struct acpi_parse_state *parser_state) +{ + return (parser_state->scope->parse_scope.op); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_has_completed_scope + * + * PARAMETERS: parser_state - Current parser state object + * + * RETURN: Boolean, TRUE = scope completed. + * + * DESCRIPTION: Is parsing of current argument complete? Determined by + * 1) AML pointer is at or beyond the end of the scope + * 2) The scope argument count has reached zero. + * + ******************************************************************************/ + +u8 +acpi_ps_has_completed_scope ( + struct acpi_parse_state *parser_state) +{ + return ((u8) ((parser_state->aml >= parser_state->scope->parse_scope.arg_end || + !parser_state->scope->parse_scope.arg_count))); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_init_scope + * + * PARAMETERS: parser_state - Current parser state object + * Root - the Root Node of this new scope + * + * RETURN: Status + * + * DESCRIPTION: Allocate and init a new scope object + * + ******************************************************************************/ + +acpi_status +acpi_ps_init_scope ( + struct acpi_parse_state *parser_state, + union acpi_parse_object *root_op) +{ + union acpi_generic_state *scope; + + + ACPI_FUNCTION_TRACE_PTR ("ps_init_scope", root_op); + + + scope = acpi_ut_create_generic_state (); + if (!scope) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + scope->common.data_type = ACPI_DESC_TYPE_STATE_RPSCOPE; + scope->parse_scope.op = root_op; + scope->parse_scope.arg_count = ACPI_VAR_ARGS; + scope->parse_scope.arg_end = parser_state->aml_end; + scope->parse_scope.pkg_end = parser_state->aml_end; + + parser_state->scope = scope; + parser_state->start_op = root_op; + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_push_scope + * + * PARAMETERS: parser_state - Current parser state object + * Op - Current op to be pushed + * remaining_args - List of args remaining + * arg_count - Fixed or variable number of args + * + * RETURN: Status + * + * DESCRIPTION: Push current op to begin parsing its argument + * + ******************************************************************************/ + +acpi_status +acpi_ps_push_scope ( + struct acpi_parse_state *parser_state, + union acpi_parse_object *op, + u32 remaining_args, + u32 arg_count) +{ + union acpi_generic_state *scope; + + + ACPI_FUNCTION_TRACE_PTR ("ps_push_scope", op); + + + scope = acpi_ut_create_generic_state (); + if (!scope) { + return_ACPI_STATUS (AE_NO_MEMORY); + } + + scope->common.data_type = ACPI_DESC_TYPE_STATE_PSCOPE; + scope->parse_scope.op = op; + scope->parse_scope.arg_list = remaining_args; + scope->parse_scope.arg_count = arg_count; + scope->parse_scope.pkg_end = parser_state->pkg_end; + + /* Push onto scope stack */ + + acpi_ut_push_generic_state (&parser_state->scope, scope); + + if (arg_count == ACPI_VAR_ARGS) { + /* multiple arguments */ + + scope->parse_scope.arg_end = parser_state->pkg_end; + } + else { + /* single argument */ + + scope->parse_scope.arg_end = ACPI_TO_POINTER (ACPI_MAX_PTR); + } + + return_ACPI_STATUS (AE_OK); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_pop_scope + * + * PARAMETERS: parser_state - Current parser state object + * Op - Where the popped op is returned + * arg_list - Where the popped "next argument" is + * returned + * arg_count - Count of objects in arg_list + * + * RETURN: Status + * + * DESCRIPTION: Return to parsing a previous op + * + ******************************************************************************/ + +void +acpi_ps_pop_scope ( + struct acpi_parse_state *parser_state, + union acpi_parse_object **op, + u32 *arg_list, + u32 *arg_count) +{ + union acpi_generic_state *scope = parser_state->scope; + + + ACPI_FUNCTION_TRACE ("ps_pop_scope"); + + + /* + * Only pop the scope if there is in fact a next scope + */ + if (scope->common.next) { + scope = acpi_ut_pop_generic_state (&parser_state->scope); + + /* return to parsing previous op */ + + *op = scope->parse_scope.op; + *arg_list = scope->parse_scope.arg_list; + *arg_count = scope->parse_scope.arg_count; + parser_state->pkg_end = scope->parse_scope.pkg_end; + + /* All done with this scope state structure */ + + acpi_ut_delete_generic_state (scope); + } + else { + /* empty parse stack, prepare to fetch next opcode */ + + *op = NULL; + *arg_list = 0; + *arg_count = 0; + } + + ACPI_DEBUG_PRINT ((ACPI_DB_PARSE, "Popped Op %p Args %X\n", *op, *arg_count)); + return_VOID; +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_cleanup_scope + * + * PARAMETERS: parser_state - Current parser state object + * + * RETURN: Status + * + * DESCRIPTION: Destroy available list, remaining stack levels, and return + * root scope + * + ******************************************************************************/ + +void +acpi_ps_cleanup_scope ( + struct acpi_parse_state *parser_state) +{ + union acpi_generic_state *scope; + + + ACPI_FUNCTION_TRACE_PTR ("ps_cleanup_scope", parser_state); + + + if (!parser_state) { + return_VOID; + } + + /* Delete anything on the scope stack */ + + while (parser_state->scope) { + scope = acpi_ut_pop_generic_state (&parser_state->scope); + acpi_ut_delete_generic_state (scope); + } + + return_VOID; +} + |