diff options
Diffstat (limited to 'drivers/acpi/acpica/exmisc.c')
| -rw-r--r-- | drivers/acpi/acpica/exmisc.c | 726 |
1 files changed, 726 insertions, 0 deletions
diff --git a/drivers/acpi/acpica/exmisc.c b/drivers/acpi/acpica/exmisc.c new file mode 100644 index 00000000000..e445463de8a --- /dev/null +++ b/drivers/acpi/acpica/exmisc.c @@ -0,0 +1,726 @@ + +/****************************************************************************** + * + * Module Name: exmisc - ACPI AML (p-code) execution - specific opcodes + * + *****************************************************************************/ + +/* + * 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/accommon.h> +#include <acpi/acinterp.h> +#include <acpi/amlcode.h> +#include <acpi/amlresrc.h> + +#define _COMPONENT ACPI_EXECUTER +ACPI_MODULE_NAME("exmisc") + +/******************************************************************************* + * + * FUNCTION: acpi_ex_get_object_reference + * + * PARAMETERS: obj_desc - Create a reference to this object + * return_desc - Where to store the reference + * walk_state - Current state + * + * RETURN: Status + * + * DESCRIPTION: Obtain and return a "reference" to the target object + * Common code for the ref_of_op and the cond_ref_of_op. + * + ******************************************************************************/ +acpi_status +acpi_ex_get_object_reference(union acpi_operand_object *obj_desc, + union acpi_operand_object **return_desc, + struct acpi_walk_state *walk_state) +{ + union acpi_operand_object *reference_obj; + union acpi_operand_object *referenced_obj; + + ACPI_FUNCTION_TRACE_PTR(ex_get_object_reference, obj_desc); + + *return_desc = NULL; + + switch (ACPI_GET_DESCRIPTOR_TYPE(obj_desc)) { + case ACPI_DESC_TYPE_OPERAND: + + if (ACPI_GET_OBJECT_TYPE(obj_desc) != ACPI_TYPE_LOCAL_REFERENCE) { + return_ACPI_STATUS(AE_AML_OPERAND_TYPE); + } + + /* + * Must be a reference to a Local or Arg + */ + switch (obj_desc->reference.class) { + case ACPI_REFCLASS_LOCAL: + case ACPI_REFCLASS_ARG: + case ACPI_REFCLASS_DEBUG: + + /* The referenced object is the pseudo-node for the local/arg */ + + referenced_obj = obj_desc->reference.object; + break; + + default: + + ACPI_ERROR((AE_INFO, "Unknown Reference Class %2.2X", + obj_desc->reference.class)); + return_ACPI_STATUS(AE_AML_INTERNAL); + } + break; + + case ACPI_DESC_TYPE_NAMED: + + /* + * A named reference that has already been resolved to a Node + */ + referenced_obj = obj_desc; + break; + + default: + + ACPI_ERROR((AE_INFO, "Invalid descriptor type %X", + ACPI_GET_DESCRIPTOR_TYPE(obj_desc))); + return_ACPI_STATUS(AE_TYPE); + } + + /* Create a new reference object */ + + reference_obj = + acpi_ut_create_internal_object(ACPI_TYPE_LOCAL_REFERENCE); + if (!reference_obj) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + reference_obj->reference.class = ACPI_REFCLASS_REFOF; + reference_obj->reference.object = referenced_obj; + *return_desc = reference_obj; + + ACPI_DEBUG_PRINT((ACPI_DB_EXEC, + "Object %p Type [%s], returning Reference %p\n", + obj_desc, acpi_ut_get_object_type_name(obj_desc), + *return_desc)); + + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_concat_template + * + * PARAMETERS: Operand0 - First source object + * Operand1 - Second source object + * actual_return_desc - Where to place the return object + * walk_state - Current walk state + * + * RETURN: Status + * + * DESCRIPTION: Concatenate two resource templates + * + ******************************************************************************/ + +acpi_status +acpi_ex_concat_template(union acpi_operand_object *operand0, + union acpi_operand_object *operand1, + union acpi_operand_object **actual_return_desc, + struct acpi_walk_state *walk_state) +{ + acpi_status status; + union acpi_operand_object *return_desc; + u8 *new_buf; + u8 *end_tag; + acpi_size length0; + acpi_size length1; + acpi_size new_length; + + ACPI_FUNCTION_TRACE(ex_concat_template); + + /* + * Find the end_tag descriptor in each resource template. + * Note1: returned pointers point TO the end_tag, not past it. + * Note2: zero-length buffers are allowed; treated like one end_tag + */ + + /* Get the length of the first resource template */ + + status = acpi_ut_get_resource_end_tag(operand0, &end_tag); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + length0 = ACPI_PTR_DIFF(end_tag, operand0->buffer.pointer); + + /* Get the length of the second resource template */ + + status = acpi_ut_get_resource_end_tag(operand1, &end_tag); + if (ACPI_FAILURE(status)) { + return_ACPI_STATUS(status); + } + + length1 = ACPI_PTR_DIFF(end_tag, operand1->buffer.pointer); + + /* Combine both lengths, minimum size will be 2 for end_tag */ + + new_length = length0 + length1 + sizeof(struct aml_resource_end_tag); + + /* Create a new buffer object for the result (with one end_tag) */ + + return_desc = acpi_ut_create_buffer_object(new_length); + if (!return_desc) { + return_ACPI_STATUS(AE_NO_MEMORY); + } + + /* + * Copy the templates to the new buffer, 0 first, then 1 follows. One + * end_tag descriptor is copied from Operand1. + */ + new_buf = return_desc->buffer.pointer; + ACPI_MEMCPY(new_buf, operand0->buffer.pointer, length0); + ACPI_MEMCPY(new_buf + length0, operand1->buffer.pointer, length1); + + /* Insert end_tag and set the checksum to zero, means "ignore checksum" */ + + new_buf[new_length - 1] = 0; + new_buf[new_length - 2] = ACPI_RESOURCE_NAME_END_TAG | 1; + + /* Return the completed resource template */ + + *actual_return_desc = return_desc; + return_ACPI_STATUS(AE_OK); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_do_concatenate + * + * PARAMETERS: Operand0 - First source object + * Operand1 - Second source object + * actual_return_desc - Where to place the return object + * walk_state - Current walk state + * + * RETURN: Status + * + * DESCRIPTION: Concatenate two objects OF THE SAME TYPE. + * + ******************************************************************************/ + +acpi_status +acpi_ex_do_concatenate(union acpi_operand_object *operand0, + union acpi_operand_object *operand1, + union acpi_operand_object **actual_return_desc, + struct acpi_walk_state *walk_state) +{ + union acpi_operand_object *local_operand1 = operand1; + union acpi_operand_object *return_desc; + char *new_buf; + acpi_status status; + + ACPI_FUNCTION_TRACE(ex_do_concatenate); + + /* + * Convert the second operand if necessary. The first operand + * determines the type of the second operand, (See the Data Types + * section of the ACPI specification.) Both object types are + * guaranteed to be either Integer/String/Buffer by the operand + * resolution mechanism. + */ + switch (ACPI_GET_OBJECT_TYPE(operand0)) { + case ACPI_TYPE_INTEGER: + status = + acpi_ex_convert_to_integer(operand1, &local_operand1, 16); + break; + + case ACPI_TYPE_STRING: + status = acpi_ex_convert_to_string(operand1, &local_operand1, + ACPI_IMPLICIT_CONVERT_HEX); + break; + + case ACPI_TYPE_BUFFER: + status = acpi_ex_convert_to_buffer(operand1, &local_operand1); + break; + + default: + ACPI_ERROR((AE_INFO, "Invalid object type: %X", + ACPI_GET_OBJECT_TYPE(operand0))); + status = AE_AML_INTERNAL; + } + + if (ACPI_FAILURE(status)) { + goto cleanup; + } + + /* + * Both operands are now known to be the same object type + * (Both are Integer, String, or Buffer), and we can now perform the + * concatenation. + */ + + /* + * There are three cases to handle: + * + * 1) Two Integers concatenated to produce a new Buffer + * 2) Two Strings concatenated to produce a new String + * 3) Two Buffers concatenated to produce a new Buffer + */ + switch (ACPI_GET_OBJECT_TYPE(operand0)) { + case ACPI_TYPE_INTEGER: + + /* Result of two Integers is a Buffer */ + /* Need enough buffer space for two integers */ + + return_desc = acpi_ut_create_buffer_object((acpi_size) + ACPI_MUL_2 + (acpi_gbl_integer_byte_width)); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + new_buf = (char *)return_desc->buffer.pointer; + + /* Copy the first integer, LSB first */ + + ACPI_MEMCPY(new_buf, &operand0->integer.value, + acpi_gbl_integer_byte_width); + + /* Copy the second integer (LSB first) after the first */ + + ACPI_MEMCPY(new_buf + acpi_gbl_integer_byte_width, + &local_operand1->integer.value, + acpi_gbl_integer_byte_width); + break; + + case ACPI_TYPE_STRING: + + /* Result of two Strings is a String */ + + return_desc = acpi_ut_create_string_object(((acpi_size) + operand0->string. + length + + local_operand1-> + string.length)); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + new_buf = return_desc->string.pointer; + + /* Concatenate the strings */ + + ACPI_STRCPY(new_buf, operand0->string.pointer); + ACPI_STRCPY(new_buf + operand0->string.length, + local_operand1->string.pointer); + break; + + case ACPI_TYPE_BUFFER: + + /* Result of two Buffers is a Buffer */ + + return_desc = acpi_ut_create_buffer_object(((acpi_size) + operand0->buffer. + length + + local_operand1-> + buffer.length)); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + new_buf = (char *)return_desc->buffer.pointer; + + /* Concatenate the buffers */ + + ACPI_MEMCPY(new_buf, operand0->buffer.pointer, + operand0->buffer.length); + ACPI_MEMCPY(new_buf + operand0->buffer.length, + local_operand1->buffer.pointer, + local_operand1->buffer.length); + break; + + default: + + /* Invalid object type, should not happen here */ + + ACPI_ERROR((AE_INFO, "Invalid object type: %X", + ACPI_GET_OBJECT_TYPE(operand0))); + status = AE_AML_INTERNAL; + goto cleanup; + } + + *actual_return_desc = return_desc; + + cleanup: + if (local_operand1 != operand1) { + acpi_ut_remove_reference(local_operand1); + } + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_do_math_op + * + * PARAMETERS: Opcode - AML opcode + * Integer0 - Integer operand #0 + * Integer1 - Integer operand #1 + * + * RETURN: Integer result of the operation + * + * DESCRIPTION: Execute a math AML opcode. The purpose of having all of the + * math functions here is to prevent a lot of pointer dereferencing + * to obtain the operands. + * + ******************************************************************************/ + +acpi_integer +acpi_ex_do_math_op(u16 opcode, acpi_integer integer0, acpi_integer integer1) +{ + + ACPI_FUNCTION_ENTRY(); + + switch (opcode) { + case AML_ADD_OP: /* Add (Integer0, Integer1, Result) */ + + return (integer0 + integer1); + + case AML_BIT_AND_OP: /* And (Integer0, Integer1, Result) */ + + return (integer0 & integer1); + + case AML_BIT_NAND_OP: /* NAnd (Integer0, Integer1, Result) */ + + return (~(integer0 & integer1)); + + case AML_BIT_OR_OP: /* Or (Integer0, Integer1, Result) */ + + return (integer0 | integer1); + + case AML_BIT_NOR_OP: /* NOr (Integer0, Integer1, Result) */ + + return (~(integer0 | integer1)); + + case AML_BIT_XOR_OP: /* XOr (Integer0, Integer1, Result) */ + + return (integer0 ^ integer1); + + case AML_MULTIPLY_OP: /* Multiply (Integer0, Integer1, Result) */ + + return (integer0 * integer1); + + case AML_SHIFT_LEFT_OP: /* shift_left (Operand, shift_count, Result) */ + + /* + * We need to check if the shiftcount is larger than the integer bit + * width since the behavior of this is not well-defined in the C language. + */ + if (integer1 >= acpi_gbl_integer_bit_width) { + return (0); + } + return (integer0 << integer1); + + case AML_SHIFT_RIGHT_OP: /* shift_right (Operand, shift_count, Result) */ + + /* + * We need to check if the shiftcount is larger than the integer bit + * width since the behavior of this is not well-defined in the C language. + */ + if (integer1 >= acpi_gbl_integer_bit_width) { + return (0); + } + return (integer0 >> integer1); + + case AML_SUBTRACT_OP: /* Subtract (Integer0, Integer1, Result) */ + + return (integer0 - integer1); + + default: + + return (0); + } +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_do_logical_numeric_op + * + * PARAMETERS: Opcode - AML opcode + * Integer0 - Integer operand #0 + * Integer1 - Integer operand #1 + * logical_result - TRUE/FALSE result of the operation + * + * RETURN: Status + * + * DESCRIPTION: Execute a logical "Numeric" AML opcode. For these Numeric + * operators (LAnd and LOr), both operands must be integers. + * + * Note: cleanest machine code seems to be produced by the code + * below, rather than using statements of the form: + * Result = (Integer0 && Integer1); + * + ******************************************************************************/ + +acpi_status +acpi_ex_do_logical_numeric_op(u16 opcode, + acpi_integer integer0, + acpi_integer integer1, u8 * logical_result) +{ + acpi_status status = AE_OK; + u8 local_result = FALSE; + + ACPI_FUNCTION_TRACE(ex_do_logical_numeric_op); + + switch (opcode) { + case AML_LAND_OP: /* LAnd (Integer0, Integer1) */ + + if (integer0 && integer1) { + local_result = TRUE; + } + break; + + case AML_LOR_OP: /* LOr (Integer0, Integer1) */ + + if (integer0 || integer1) { + local_result = TRUE; + } + break; + + default: + status = AE_AML_INTERNAL; + break; + } + + /* Return the logical result and status */ + + *logical_result = local_result; + return_ACPI_STATUS(status); +} + +/******************************************************************************* + * + * FUNCTION: acpi_ex_do_logical_op + * + * PARAMETERS: Opcode - AML opcode + * Operand0 - operand #0 + * Operand1 - operand #1 + * logical_result - TRUE/FALSE result of the operation + * + * RETURN: Status + * + * DESCRIPTION: Execute a logical AML opcode. The purpose of having all of the + * functions here is to prevent a lot of pointer dereferencing + * to obtain the operands and to simplify the generation of the + * logical value. For the Numeric operators (LAnd and LOr), both + * operands must be integers. For the other logical operators, + * operands can be any combination of Integer/String/Buffer. The + * first operand determines the type to which the second operand + * will be converted. + * + * Note: cleanest machine code seems to be produced by the code + * below, rather than using statements of the form: + * Result = (Operand0 == Operand1); + * + ******************************************************************************/ + +acpi_status +acpi_ex_do_logical_op(u16 opcode, + union acpi_operand_object *operand0, + union acpi_operand_object *operand1, u8 * logical_result) +{ + union acpi_operand_object *local_operand1 = operand1; + acpi_integer integer0; + acpi_integer integer1; + u32 length0; + u32 length1; + acpi_status status = AE_OK; + u8 local_result = FALSE; + int compare; + + ACPI_FUNCTION_TRACE(ex_do_logical_op); + + /* + * Convert the second operand if necessary. The first operand + * determines the type of the second operand, (See the Data Types + * section of the ACPI 3.0+ specification.) Both object types are + * guaranteed to be either Integer/String/Buffer by the operand + * resolution mechanism. + */ + switch (ACPI_GET_OBJECT_TYPE(operand0)) { + case ACPI_TYPE_INTEGER: + status = + acpi_ex_convert_to_integer(operand1, &local_operand1, 16); + break; + + case ACPI_TYPE_STRING: + status = acpi_ex_convert_to_string(operand1, &local_operand1, + ACPI_IMPLICIT_CONVERT_HEX); + break; + + case ACPI_TYPE_BUFFER: + status = acpi_ex_convert_to_buffer(operand1, &local_operand1); + break; + + default: + status = AE_AML_INTERNAL; + break; + } + + if (ACPI_FAILURE(status)) { + goto cleanup; + } + + /* + * Two cases: 1) Both Integers, 2) Both Strings or Buffers + */ + if (ACPI_GET_OBJECT_TYPE(operand0) == ACPI_TYPE_INTEGER) { + /* + * 1) Both operands are of type integer + * Note: local_operand1 may have changed above + */ + integer0 = operand0->integer.value; + integer1 = local_operand1->integer.value; + + switch (opcode) { + case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ + + if (integer0 == integer1) { + local_result = TRUE; + } + break; + + case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ + + if (integer0 > integer1) { + local_result = TRUE; + } + break; + + case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ + + if (integer0 < integer1) { + local_result = TRUE; + } + break; + + default: + status = AE_AML_INTERNAL; + break; + } + } else { + /* + * 2) Both operands are Strings or both are Buffers + * Note: Code below takes advantage of common Buffer/String + * object fields. local_operand1 may have changed above. Use + * memcmp to handle nulls in buffers. + */ + length0 = operand0->buffer.length; + length1 = local_operand1->buffer.length; + + /* Lexicographic compare: compare the data bytes */ + + compare = ACPI_MEMCMP(operand0->buffer.pointer, + local_operand1->buffer.pointer, + (length0 > length1) ? length1 : length0); + + switch (opcode) { + case AML_LEQUAL_OP: /* LEqual (Operand0, Operand1) */ + + /* Length and all bytes must be equal */ + + if ((length0 == length1) && (compare == 0)) { + + /* Length and all bytes match ==> TRUE */ + + local_result = TRUE; + } + break; + + case AML_LGREATER_OP: /* LGreater (Operand0, Operand1) */ + + if (compare > 0) { + local_result = TRUE; + goto cleanup; /* TRUE */ + } + if (compare < 0) { + goto cleanup; /* FALSE */ + } + + /* Bytes match (to shortest length), compare lengths */ + + if (length0 > length1) { + local_result = TRUE; + } + break; + + case AML_LLESS_OP: /* LLess (Operand0, Operand1) */ + + if (compare > 0) { + goto cleanup; /* FALSE */ + } + if (compare < 0) { + local_result = TRUE; + goto cleanup; /* TRUE */ + } + + /* Bytes match (to shortest length), compare lengths */ + + if (length0 < length1) { + local_result = TRUE; + } + break; + + default: + status = AE_AML_INTERNAL; + break; + } + } + + cleanup: + + /* New object was created if implicit conversion performed - delete */ + + if (local_operand1 != operand1) { + acpi_ut_remove_reference(local_operand1); + } + + /* Return the logical result and status */ + + *logical_result = local_result; + return_ACPI_STATUS(status); +} |