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Diffstat (limited to 'drivers/acpi/parser/psutils.c')
| -rw-r--r-- | drivers/acpi/parser/psutils.c | 309 |
1 files changed, 309 insertions, 0 deletions
diff --git a/drivers/acpi/parser/psutils.c b/drivers/acpi/parser/psutils.c new file mode 100644 index 00000000000..b3597cb19f8 --- /dev/null +++ b/drivers/acpi/parser/psutils.c @@ -0,0 +1,309 @@ +/****************************************************************************** + * + * Module Name: psutils - Parser miscellaneous utilities (Parser only) + * + *****************************************************************************/ + +/* + * 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> +#include <acpi/amlcode.h> +#include <acpi/acnamesp.h> + +#define _COMPONENT ACPI_PARSER + ACPI_MODULE_NAME ("psutils") + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_create_scope_op + * + * PARAMETERS: None + * + * RETURN: scope_op + * + * DESCRIPTION: Create a Scope and associated namepath op with the root name + * + ******************************************************************************/ + +union acpi_parse_object * +acpi_ps_create_scope_op ( + void) +{ + union acpi_parse_object *scope_op; + + + scope_op = acpi_ps_alloc_op (AML_SCOPE_OP); + if (!scope_op) { + return (NULL); + } + + + scope_op->named.name = ACPI_ROOT_NAME; + return (scope_op); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_init_op + * + * PARAMETERS: Op - A newly allocated Op object + * Opcode - Opcode to store in the Op + * + * RETURN: Status + * + * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on + * opcode + * + ******************************************************************************/ + +void +acpi_ps_init_op ( + union acpi_parse_object *op, + u16 opcode) +{ + ACPI_FUNCTION_ENTRY (); + + + op->common.data_type = ACPI_DESC_TYPE_PARSER; + op->common.aml_opcode = opcode; + + ACPI_DISASM_ONLY_MEMBERS (ACPI_STRNCPY (op->common.aml_op_name, + (acpi_ps_get_opcode_info (opcode))->name, sizeof (op->common.aml_op_name))); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_alloc_op + * + * PARAMETERS: Opcode - Opcode that will be stored in the new Op + * + * RETURN: Pointer to the new Op. + * + * DESCRIPTION: Allocate an acpi_op, choose op type (and thus size) based on + * opcode. A cache of opcodes is available for the pure + * GENERIC_OP, since this is by far the most commonly used. + * + ******************************************************************************/ + +union acpi_parse_object* +acpi_ps_alloc_op ( + u16 opcode) +{ + union acpi_parse_object *op; + const struct acpi_opcode_info *op_info; + u8 flags = ACPI_PARSEOP_GENERIC; + + + ACPI_FUNCTION_ENTRY (); + + + op_info = acpi_ps_get_opcode_info (opcode); + + /* Determine type of parse_op required */ + + if (op_info->flags & AML_DEFER) { + flags = ACPI_PARSEOP_DEFERRED; + } + else if (op_info->flags & AML_NAMED) { + flags = ACPI_PARSEOP_NAMED; + } + else if (opcode == AML_INT_BYTELIST_OP) { + flags = ACPI_PARSEOP_BYTELIST; + } + + /* Allocate the minimum required size object */ + + if (flags == ACPI_PARSEOP_GENERIC) { + /* The generic op (default) is by far the most common (16 to 1) */ + + op = acpi_ut_acquire_from_cache (ACPI_MEM_LIST_PSNODE); + } + else { + /* Extended parseop */ + + op = acpi_ut_acquire_from_cache (ACPI_MEM_LIST_PSNODE_EXT); + } + + /* Initialize the Op */ + + if (op) { + acpi_ps_init_op (op, opcode); + op->common.flags = flags; + } + + return (op); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ps_free_op + * + * PARAMETERS: Op - Op to be freed + * + * RETURN: None. + * + * DESCRIPTION: Free an Op object. Either put it on the GENERIC_OP cache list + * or actually free it. + * + ******************************************************************************/ + +void +acpi_ps_free_op ( + union acpi_parse_object *op) +{ + ACPI_FUNCTION_NAME ("ps_free_op"); + + + if (op->common.aml_opcode == AML_INT_RETURN_VALUE_OP) { + ACPI_DEBUG_PRINT ((ACPI_DB_ALLOCATIONS, "Free retval op: %p\n", op)); + } + + if (op->common.flags & ACPI_PARSEOP_GENERIC) { + acpi_ut_release_to_cache (ACPI_MEM_LIST_PSNODE, op); + } + else { + acpi_ut_release_to_cache (ACPI_MEM_LIST_PSNODE_EXT, op); + } +} + + +#ifdef ACPI_ENABLE_OBJECT_CACHE +/******************************************************************************* + * + * FUNCTION: acpi_ps_delete_parse_cache + * + * PARAMETERS: None + * + * RETURN: None + * + * DESCRIPTION: Free all objects that are on the parse cache list. + * + ******************************************************************************/ + +void +acpi_ps_delete_parse_cache ( + void) +{ + ACPI_FUNCTION_TRACE ("ps_delete_parse_cache"); + + + acpi_ut_delete_generic_cache (ACPI_MEM_LIST_PSNODE); + acpi_ut_delete_generic_cache (ACPI_MEM_LIST_PSNODE_EXT); + return_VOID; +} +#endif + + +/******************************************************************************* + * + * FUNCTION: Utility functions + * + * DESCRIPTION: Low level character and object functions + * + ******************************************************************************/ + + +/* + * Is "c" a namestring lead character? + */ +u8 +acpi_ps_is_leading_char ( + u32 c) +{ + return ((u8) (c == '_' || (c >= 'A' && c <= 'Z'))); +} + + +/* + * Is "c" a namestring prefix character? + */ +u8 +acpi_ps_is_prefix_char ( + u32 c) +{ + return ((u8) (c == '\\' || c == '^')); +} + + +/* + * Get op's name (4-byte name segment) or 0 if unnamed + */ +#ifdef ACPI_FUTURE_USAGE +u32 +acpi_ps_get_name ( + union acpi_parse_object *op) +{ + + + /* The "generic" object has no name associated with it */ + + if (op->common.flags & ACPI_PARSEOP_GENERIC) { + return (0); + } + + /* Only the "Extended" parse objects have a name */ + + return (op->named.name); +} +#endif /* ACPI_FUTURE_USAGE */ + + +/* + * Set op's name + */ +void +acpi_ps_set_name ( + union acpi_parse_object *op, + u32 name) +{ + + /* The "generic" object has no name associated with it */ + + if (op->common.flags & ACPI_PARSEOP_GENERIC) { + return; + } + + op->named.name = name; +} + |