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Diffstat (limited to 'drivers/acpi/parser/psargs.c')
| -rw-r--r-- | drivers/acpi/parser/psargs.c | 751 |
1 files changed, 751 insertions, 0 deletions
diff --git a/drivers/acpi/parser/psargs.c b/drivers/acpi/parser/psargs.c new file mode 100644 index 0000000..d830b29 --- /dev/null +++ b/drivers/acpi/parser/psargs.c @@ -0,0 +1,751 @@ +/****************************************************************************** + * + * Module Name: psargs - Parse AML opcode arguments + * + *****************************************************************************/ + +/* + * Copyright (C) 2000 - 2008, Intel Corp. + * 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> +#include <acpi/acdispat.h> + +#define _COMPONENT ACPI_PARSER +ACPI_MODULE_NAME("psargs") + +/* Local prototypes */ +static u32 +acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state); + +static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state + *parser_state); + +/******************************************************************************* + * + * 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. + * Note: Largest package length is 28 bits, from ACPI specification + * + ******************************************************************************/ + +static u32 +acpi_ps_get_next_package_length(struct acpi_parse_state *parser_state) +{ + u8 *aml = parser_state->aml; + u32 package_length = 0; + u32 byte_count; + u8 byte_zero_mask = 0x3F; /* Default [0:5] */ + + ACPI_FUNCTION_TRACE(ps_get_next_package_length); + + /* + * Byte 0 bits [6:7] contain the number of additional bytes + * used to encode the package length, either 0,1,2, or 3 + */ + byte_count = (aml[0] >> 6); + parser_state->aml += ((acpi_size) byte_count + 1); + + /* Get bytes 3, 2, 1 as needed */ + + while (byte_count) { + /* + * Final bit positions for the package length bytes: + * Byte3->[20:27] + * Byte2->[12:19] + * Byte1->[04:11] + * Byte0->[00:03] + */ + package_length |= (aml[byte_count] << ((byte_count << 3) - 4)); + + byte_zero_mask = 0x0F; /* Use bits [0:3] of byte 0 */ + byte_count--; + } + + /* Byte 0 is a special case, either bits [0:3] or [0:5] are used */ + + package_length |= (aml[0] & byte_zero_mask); + return_UINT32(package_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(struct acpi_parse_state *parser_state) +{ + u8 *start = parser_state->aml; + u32 package_length; + + ACPI_FUNCTION_TRACE(ps_get_next_package_end); + + /* Function below updates parser_state->Aml */ + + package_length = acpi_ps_get_next_package_length(parser_state); + + return_PTR(start + package_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.) + * + ******************************************************************************/ + +char *acpi_ps_get_next_namestring(struct acpi_parse_state *parser_state) +{ + u8 *start = parser_state->aml; + u8 *end = parser_state->aml; + + ACPI_FUNCTION_TRACE(ps_get_next_namestring); + + /* Point past any namestring prefix characters (backslash or carat) */ + + while (acpi_ps_is_prefix_char(*end)) { + end++; + } + + /* Decode the path prefix character */ + + switch (*end) { + case 0: + + /* null_name */ + + if (end == start) { + start = NULL; + } + end++; + break; + + case AML_DUAL_NAME_PREFIX: + + /* Two name segments */ + + end += 1 + (2 * ACPI_NAME_SIZE); + break; + + case AML_MULTI_NAME_PREFIX_OP: + + /* Multiple name segments, 4 chars each, count in next byte */ + + end += 2 + (*(end + 1) * ACPI_NAME_SIZE); + break; + + default: + + /* Single name segment */ + + end += ACPI_NAME_SIZE; + break; + } + + parser_state->aml = end; + return_PTR((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. + * possible_method_call - Whether the namepath can possibly be the + * start of a method call + * + * RETURN: Status + * + * DESCRIPTION: Get next name (if method call, return # of required args). + * Names are looked up in the 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. + * + ******************************************************************************/ + +acpi_status +acpi_ps_get_next_namepath(struct acpi_walk_state *walk_state, + struct acpi_parse_state *parser_state, + union acpi_parse_object *arg, u8 possible_method_call) +{ + acpi_status status; + char *path; + union acpi_parse_object *name_op; + union acpi_operand_object *method_desc; + struct acpi_namespace_node *node; + u8 *start = parser_state->aml; + + ACPI_FUNCTION_TRACE(ps_get_next_namepath); + + path = acpi_ps_get_next_namestring(parser_state); + acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP); + + /* Null path case is allowed, just exit */ + + if (!path) { + arg->common.value.name = path; + return_ACPI_STATUS(AE_OK); + } + + /* + * Lookup the name in the internal namespace, starting with the current + * scope. 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 + * the upsearch) + */ + status = acpi_ns_lookup(walk_state->scope_info, path, + ACPI_TYPE_ANY, ACPI_IMODE_EXECUTE, + ACPI_NS_SEARCH_PARENT | ACPI_NS_DONT_OPEN_SCOPE, + NULL, &node); + + /* + * If this name is a control method invocation, we must + * setup the method call + */ + if (ACPI_SUCCESS(status) && + possible_method_call && (node->type == ACPI_TYPE_METHOD)) { + if (walk_state->opcode == AML_UNLOAD_OP) { + /* + * acpi_ps_get_next_namestring has increased the AML pointer, + * so we need to restore the saved AML pointer for method call. + */ + walk_state->parser_state.aml = start; + walk_state->arg_count = 1; + acpi_ps_init_op(arg, AML_INT_METHODCALL_OP); + return_ACPI_STATUS(AE_OK); + } + + /* This name is actually a control method invocation */ + + method_desc = acpi_ns_get_attached_object(node); + ACPI_DEBUG_PRINT((ACPI_DB_PARSE, + "Control Method - %p Desc %p Path=%p\n", node, + method_desc, path)); + + name_op = acpi_ps_alloc_op(AML_INT_NAMEPATH_OP); + if (!name_op) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* Change Arg into a METHOD CALL and attach name to it */ + + acpi_ps_init_op(arg, AML_INT_METHODCALL_OP); + name_op->common.value.name = path; + + /* Point METHODCALL/NAME to the METHOD Node */ + + name_op->common.node = node; + acpi_ps_append_arg(arg, name_op); + + if (!method_desc) { + ACPI_ERROR((AE_INFO, + "Control Method %p has no attached object", + node)); + return_ACPI_STATUS(AE_AML_INTERNAL); + } + + ACPI_DEBUG_PRINT((ACPI_DB_PARSE, + "Control Method - %p Args %X\n", + node, method_desc->method.param_count)); + + /* Get the number of arguments to expect */ + + walk_state->arg_count = method_desc->method.param_count; + return_ACPI_STATUS(AE_OK); + } + + /* + * Special handling if the name was not found during the lookup - + * some not_found cases are allowed + */ + if (status == AE_NOT_FOUND) { + + /* 1) not_found is ok during load pass 1/2 (allow forward references) */ + + if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) != + ACPI_PARSE_EXECUTE) { + status = AE_OK; + } + + /* 2) not_found during a cond_ref_of(x) is ok by definition */ + + else if (walk_state->op->common.aml_opcode == + AML_COND_REF_OF_OP) { + status = AE_OK; + } + + /* + * 3) not_found while building a Package is ok at this point, we + * may flag as an error later if slack mode is not enabled. + * (Some ASL code depends on allowing this behavior) + */ + else if ((arg->common.parent) && + ((arg->common.parent->common.aml_opcode == + AML_PACKAGE_OP) + || (arg->common.parent->common.aml_opcode == + AML_VAR_PACKAGE_OP))) { + status = AE_OK; + } + } + + /* Final exception check (may have been changed from code above) */ + + if (ACPI_FAILURE(status)) { + ACPI_ERROR_NAMESPACE(path, status); + + if ((walk_state->parse_flags & ACPI_PARSE_MODE_MASK) == + ACPI_PARSE_EXECUTE) { + + /* Report a control method execution error */ + + status = acpi_ds_method_error(status, walk_state); + } + } + + /* Save the namepath */ + + arg->common.value.name = path; + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * 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(struct acpi_parse_state *parser_state, + u32 arg_type, union acpi_parse_object *arg) +{ + u32 length; + u16 opcode; + u8 *aml = parser_state->aml; + + ACPI_FUNCTION_TRACE_U32(ps_get_next_simple_arg, arg_type); + + switch (arg_type) { + case ARGP_BYTEDATA: + + /* Get 1 byte from the AML stream */ + + opcode = AML_BYTE_OP; + arg->common.value.integer = (acpi_integer) * aml; + length = 1; + break; + + case ARGP_WORDDATA: + + /* Get 2 bytes from the AML stream */ + + opcode = AML_WORD_OP; + ACPI_MOVE_16_TO_64(&arg->common.value.integer, aml); + length = 2; + break; + + case ARGP_DWORDDATA: + + /* Get 4 bytes from the AML stream */ + + opcode = AML_DWORD_OP; + ACPI_MOVE_32_TO_64(&arg->common.value.integer, aml); + length = 4; + break; + + case ARGP_QWORDDATA: + + /* Get 8 bytes from the AML stream */ + + opcode = AML_QWORD_OP; + ACPI_MOVE_64_TO_64(&arg->common.value.integer, aml); + length = 8; + break; + + case ARGP_CHARLIST: + + /* Get a pointer to the string, point past the string */ + + opcode = AML_STRING_OP; + arg->common.value.string = ACPI_CAST_PTR(char, aml); + + /* Find the null terminator */ + + length = 0; + while (aml[length]) { + length++; + } + length++; + break; + + case ARGP_NAME: + case ARGP_NAMESTRING: + + acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP); + arg->common.value.name = + acpi_ps_get_next_namestring(parser_state); + return_VOID; + + default: + + ACPI_ERROR((AE_INFO, "Invalid ArgType %X", arg_type)); + return_VOID; + } + + acpi_ps_init_op(arg, opcode); + parser_state->aml += length; + 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) + * + ******************************************************************************/ + +static union acpi_parse_object *acpi_ps_get_next_field(struct acpi_parse_state + *parser_state) +{ + u32 aml_offset = (u32) + ACPI_PTR_DIFF(parser_state->aml, + parser_state->aml_start); + union acpi_parse_object *field; + u16 opcode; + u32 name; + + ACPI_FUNCTION_TRACE(ps_get_next_field); + + /* Determine field type */ + + switch (ACPI_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) { + return_PTR(NULL); + } + + field->common.aml_offset = aml_offset; + + /* Decode the field type */ + + switch (opcode) { + case AML_INT_NAMEDFIELD_OP: + + /* Get the 4-character name */ + + ACPI_MOVE_32_TO_32(&name, parser_state->aml); + acpi_ps_set_name(field, name); + parser_state->aml += ACPI_NAME_SIZE; + + /* Get the length which is encoded as a package length */ + + field->common.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->common.value.size = + acpi_ps_get_next_package_length(parser_state); + break; + + case AML_INT_ACCESSFIELD_OP: + + /* + * Get access_type and access_attrib and merge into the field Op + * access_type is first operand, access_attribute is second + */ + field->common.value.integer = + (((u32) ACPI_GET8(parser_state->aml) << 8)); + parser_state->aml++; + field->common.value.integer |= ACPI_GET8(parser_state->aml); + parser_state->aml++; + break; + + default: + + /* Opcode was set in previous switch */ + break; + } + + return_PTR(field); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ps_get_next_arg + * + * PARAMETERS: walk_state - Current state + * parser_state - Current parser state object + * arg_type - The argument type (AML_*_ARG) + * return_arg - Where the next arg is returned + * + * RETURN: Status, and an op object containing the next argument. + * + * DESCRIPTION: Get next argument (including complex list arguments that require + * pushing the parser stack) + * + ******************************************************************************/ + +acpi_status +acpi_ps_get_next_arg(struct acpi_walk_state *walk_state, + struct acpi_parse_state *parser_state, + u32 arg_type, union acpi_parse_object **return_arg) +{ + union acpi_parse_object *arg = NULL; + union acpi_parse_object *prev = NULL; + union acpi_parse_object *field; + u32 subop; + acpi_status status = AE_OK; + + ACPI_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) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + 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) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + if (prev) { + prev->common.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) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* Fill in bytelist data */ + + arg->common.value.size = (u32) + ACPI_PTR_DIFF(parser_state->pkg_end, + parser_state->aml); + arg->named.data = parser_state->aml; + + /* Skip to End of byte data */ + + parser_state->aml = parser_state->pkg_end; + } + break; + + case ARGP_TARGET: + case ARGP_SUPERNAME: + case ARGP_SIMPLENAME: + + 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) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* To support super_name arg of Unload */ + + if (walk_state->opcode == AML_UNLOAD_OP) { + status = + acpi_ps_get_next_namepath(walk_state, + parser_state, arg, + 1); + + /* + * If the super_name arg of Unload is a method call, + * we have restored the AML pointer, just free this Arg + */ + if (arg->common.aml_opcode == + AML_INT_METHODCALL_OP) { + acpi_ps_free_op(arg); + arg = NULL; + } + } else { + status = + acpi_ps_get_next_namepath(walk_state, + parser_state, arg, + 0); + } + } else { + /* Single complex argument, nothing returned */ + + walk_state->arg_count = 1; + } + break; + + case ARGP_DATAOBJ: + case ARGP_TERMARG: + + /* Single complex argument, nothing returned */ + + walk_state->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 */ + + walk_state->arg_count = ACPI_VAR_ARGS; + } + break; + + default: + + ACPI_ERROR((AE_INFO, "Invalid ArgType: %X", arg_type)); + status = AE_AML_OPERAND_TYPE; + break; + } + + *return_arg = arg; + return_ACPI_STATUS(status); +} |
