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c51a4de85d
android_kernel_xiaomi_sm8350/drivers/acpi/parser/psargs.c
Bob Moore c51a4de85d [ACPI] ACPICA 20051117 
Fixed a problem in the AML parser where the method thread
count could be decremented below zero if any errors
occurred during the method parse phase. This should
eliminate AE_AML_METHOD_LIMIT exceptions seen on some
machines. This also fixed a related regression with the
mechanism that detects and corrects methods that cannot
properly handle reentrancy (related to the deployment of
the new OwnerId mechanism.)

Eliminated the pre-parsing of control methods (to detect
errors) during table load. Related to the problem above,
this was causing unwind issues if any errors occurred
during the parse, and it seemed to be overkill. A table
load should not be aborted if there are problems with
any single control method, thus rendering this feature
rather pointless.

Fixed a problem with the new table-driven resource manager
where an internal buffer overflow could occur for small
resource templates.

Implemented a new external interface, acpi_get_vendor_resource()
This interface will find and return a vendor-defined
resource descriptor within a _CRS or _PRS
method via an ACPI 3.0 UUID match. (from Bjorn Helgaas)

Removed the length limit (200) on string objects as
per the upcoming ACPI 3.0A specification. This affects
the following areas of the interpreter: 1) any implicit
conversion of a Buffer to a String, 2) a String object
result of the ASL Concatentate operator, 3) the String
object result of the ASL ToString operator.

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
2005-12-10 00:27:56 -05:00

706 lines
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/******************************************************************************
*
* Module Name: psargs - Parse AML opcode arguments
*
*****************************************************************************/
/*
* 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("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;
acpi_native_uint 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 += (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.
* 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 method_call)
{
char *path;
union acpi_parse_object *name_op;
acpi_status status = AE_OK;
union acpi_operand_object *method_desc;
struct acpi_namespace_node *node;
union acpi_generic_state scope_info;
ACPI_FUNCTION_TRACE("ps_get_next_namepath");
path = acpi_ps_get_next_namestring(parser_state);
/* Null path case is allowed */
if (path) {
/*
* 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,
ACPI_IMODE_EXECUTE,
ACPI_NS_SEARCH_PARENT |
ACPI_NS_DONT_OPEN_SCOPE, NULL, &node);
if (ACPI_SUCCESS(status) && method_call) {
if (node->type == ACPI_TYPE_METHOD) {
/* 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_REPORT_ERROR(("ps_get_next_namepath: Control Method %p has no attached object\n", 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);
}
/*
* Else this is normal named object reference.
* Just init the NAMEPATH object with the pathname.
* (See code below)
*/
}
if (ACPI_FAILURE(status)) {
/*
* 1) Any error other than NOT_FOUND is always severe
* 2) NOT_FOUND is only important if we are executing a method.
* 3) If executing a cond_ref_of opcode, NOT_FOUND is ok.
*/
if ((((walk_state->
parse_flags & ACPI_PARSE_MODE_MASK) ==
ACPI_PARSE_EXECUTE) && (status == AE_NOT_FOUND)
&& (walk_state->op->common.aml_opcode !=
AML_COND_REF_OF_OP))
|| (status != AE_NOT_FOUND)) {
ACPI_REPORT_NSERROR(path, status);
acpi_os_printf
("search_node %p start_node %p return_node %p\n",
scope_info.scope.node,
parser_state->start_node, node);
} else {
/*
* We got a NOT_FOUND during table load or we encountered
* a cond_ref_of(x) where the target does not exist.
* Either case is ok
*/
status = AE_OK;
}
}
}
/*
* Regardless of success/failure above,
* Just initialize the Op with the pathname.
*/
acpi_ps_init_op(arg, AML_INT_NAMEPATH_OP);
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_REPORT_ERROR(("Invalid arg_type %X\n", 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);
}
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_REPORT_ERROR(("Invalid arg_type: %X\n", arg_type));
status = AE_AML_OPERAND_TYPE;
break;
}
*return_arg = arg;
return_ACPI_STATUS(status);
}
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