diff options
Diffstat (limited to 'drivers/acpi/executer/exoparg1.c')
| -rw-r--r-- | drivers/acpi/executer/exoparg1.c | 1013 |
1 files changed, 1013 insertions, 0 deletions
diff --git a/drivers/acpi/executer/exoparg1.c b/drivers/acpi/executer/exoparg1.c new file mode 100644 index 000000000000..8482aefaf38b --- /dev/null +++ b/drivers/acpi/executer/exoparg1.c @@ -0,0 +1,1013 @@ + +/****************************************************************************** + * + * Module Name: exoparg1 - AML execution - opcodes with 1 argument + * + *****************************************************************************/ + +/* + * 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/acdispat.h> +#include <acpi/acinterp.h> +#include <acpi/amlcode.h> +#include <acpi/acnamesp.h> + + +#define _COMPONENT ACPI_EXECUTER + ACPI_MODULE_NAME ("exoparg1") + + +/*! + * Naming convention for AML interpreter execution routines. + * + * The routines that begin execution of AML opcodes are named with a common + * convention based upon the number of arguments, the number of target operands, + * and whether or not a value is returned: + * + * AcpiExOpcode_xA_yT_zR + * + * Where: + * + * xA - ARGUMENTS: The number of arguments (input operands) that are + * required for this opcode type (0 through 6 args). + * yT - TARGETS: The number of targets (output operands) that are required + * for this opcode type (0, 1, or 2 targets). + * zR - RETURN VALUE: Indicates whether this opcode type returns a value + * as the function return (0 or 1). + * + * The AcpiExOpcode* functions are called via the Dispatcher component with + * fully resolved operands. +!*/ + +/******************************************************************************* + * + * FUNCTION: acpi_ex_opcode_0A_0T_1R + * + * PARAMETERS: walk_state - Current state (contains AML opcode) + * + * RETURN: Status + * + * DESCRIPTION: Execute operator with no operands, one return value + * + ******************************************************************************/ + +acpi_status +acpi_ex_opcode_0A_0T_1R ( + struct acpi_walk_state *walk_state) +{ + acpi_status status = AE_OK; + union acpi_operand_object *return_desc = NULL; + + + ACPI_FUNCTION_TRACE_STR ("ex_opcode_0A_0T_1R", acpi_ps_get_opcode_name (walk_state->opcode)); + + + /* Examine the AML opcode */ + + switch (walk_state->opcode) { + case AML_TIMER_OP: /* Timer () */ + + /* Create a return object of type Integer */ + + return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + return_desc->integer.value = acpi_os_get_timer (); + break; + + default: /* Unknown opcode */ + + ACPI_REPORT_ERROR (("acpi_ex_opcode_0A_0T_1R: Unknown opcode %X\n", + walk_state->opcode)); + status = AE_AML_BAD_OPCODE; + break; + } + +cleanup: + + if (!walk_state->result_obj) { + walk_state->result_obj = return_desc; + } + + /* Delete return object on error */ + + if (ACPI_FAILURE (status)) { + acpi_ut_remove_reference (return_desc); + } + + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_opcode_1A_0T_0R + * + * PARAMETERS: walk_state - Current state (contains AML opcode) + * + * RETURN: Status + * + * DESCRIPTION: Execute Type 1 monadic operator with numeric operand on + * object stack + * + ******************************************************************************/ + +acpi_status +acpi_ex_opcode_1A_0T_0R ( + struct acpi_walk_state *walk_state) +{ + union acpi_operand_object **operand = &walk_state->operands[0]; + acpi_status status = AE_OK; + + + ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_0T_0R", acpi_ps_get_opcode_name (walk_state->opcode)); + + + /* Examine the AML opcode */ + + switch (walk_state->opcode) { + case AML_RELEASE_OP: /* Release (mutex_object) */ + + status = acpi_ex_release_mutex (operand[0], walk_state); + break; + + + case AML_RESET_OP: /* Reset (event_object) */ + + status = acpi_ex_system_reset_event (operand[0]); + break; + + + case AML_SIGNAL_OP: /* Signal (event_object) */ + + status = acpi_ex_system_signal_event (operand[0]); + break; + + + case AML_SLEEP_OP: /* Sleep (msec_time) */ + + status = acpi_ex_system_do_suspend (operand[0]->integer.value); + break; + + + case AML_STALL_OP: /* Stall (usec_time) */ + + status = acpi_ex_system_do_stall ((u32) operand[0]->integer.value); + break; + + + case AML_UNLOAD_OP: /* Unload (Handle) */ + + status = acpi_ex_unload_table (operand[0]); + break; + + + default: /* Unknown opcode */ + + ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_0T_0R: Unknown opcode %X\n", + walk_state->opcode)); + status = AE_AML_BAD_OPCODE; + break; + } + + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_opcode_1A_1T_0R + * + * PARAMETERS: walk_state - Current state (contains AML opcode) + * + * RETURN: Status + * + * DESCRIPTION: Execute opcode with one argument, one target, and no + * return value. + * + ******************************************************************************/ + +acpi_status +acpi_ex_opcode_1A_1T_0R ( + struct acpi_walk_state *walk_state) +{ + acpi_status status = AE_OK; + union acpi_operand_object **operand = &walk_state->operands[0]; + + + ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_1T_0R", acpi_ps_get_opcode_name (walk_state->opcode)); + + + /* Examine the AML opcode */ + + switch (walk_state->opcode) { + case AML_LOAD_OP: + + status = acpi_ex_load_op (operand[0], operand[1], walk_state); + break; + + default: /* Unknown opcode */ + + ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_1T_0R: Unknown opcode %X\n", + walk_state->opcode)); + status = AE_AML_BAD_OPCODE; + goto cleanup; + } + + +cleanup: + + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_opcode_1A_1T_1R + * + * PARAMETERS: walk_state - Current state (contains AML opcode) + * + * RETURN: Status + * + * DESCRIPTION: Execute opcode with one argument, one target, and a + * return value. + * + ******************************************************************************/ + +acpi_status +acpi_ex_opcode_1A_1T_1R ( + struct acpi_walk_state *walk_state) +{ + acpi_status status = AE_OK; + union acpi_operand_object **operand = &walk_state->operands[0]; + union acpi_operand_object *return_desc = NULL; + union acpi_operand_object *return_desc2 = NULL; + u32 temp32; + u32 i; + acpi_integer power_of_ten; + acpi_integer digit; + + + ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_1T_1R", acpi_ps_get_opcode_name (walk_state->opcode)); + + + /* Examine the AML opcode */ + + switch (walk_state->opcode) { + case AML_BIT_NOT_OP: + case AML_FIND_SET_LEFT_BIT_OP: + case AML_FIND_SET_RIGHT_BIT_OP: + case AML_FROM_BCD_OP: + case AML_TO_BCD_OP: + case AML_COND_REF_OF_OP: + + /* Create a return object of type Integer for these opcodes */ + + return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + switch (walk_state->opcode) { + case AML_BIT_NOT_OP: /* Not (Operand, Result) */ + + return_desc->integer.value = ~operand[0]->integer.value; + break; + + + case AML_FIND_SET_LEFT_BIT_OP: /* find_set_left_bit (Operand, Result) */ + + return_desc->integer.value = operand[0]->integer.value; + + /* + * Acpi specification describes Integer type as a little + * endian unsigned value, so this boundary condition is valid. + */ + for (temp32 = 0; return_desc->integer.value && + temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) { + return_desc->integer.value >>= 1; + } + + return_desc->integer.value = temp32; + break; + + + case AML_FIND_SET_RIGHT_BIT_OP: /* find_set_right_bit (Operand, Result) */ + + return_desc->integer.value = operand[0]->integer.value; + + /* + * The Acpi specification describes Integer type as a little + * endian unsigned value, so this boundary condition is valid. + */ + for (temp32 = 0; return_desc->integer.value && + temp32 < ACPI_INTEGER_BIT_SIZE; ++temp32) { + return_desc->integer.value <<= 1; + } + + /* Since the bit position is one-based, subtract from 33 (65) */ + + return_desc->integer.value = temp32 == 0 ? 0 : + (ACPI_INTEGER_BIT_SIZE + 1) - temp32; + break; + + + case AML_FROM_BCD_OP: /* from_bcd (BCDValue, Result) */ + + /* + * The 64-bit ACPI integer can hold 16 4-bit BCD characters + * (if table is 32-bit, integer can hold 8 BCD characters) + * Convert each 4-bit BCD value + */ + power_of_ten = 1; + return_desc->integer.value = 0; + digit = operand[0]->integer.value; + + /* Convert each BCD digit (each is one nybble wide) */ + + for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) { + /* Get the least significant 4-bit BCD digit */ + + temp32 = ((u32) digit) & 0xF; + + /* Check the range of the digit */ + + if (temp32 > 9) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "BCD digit too large (not decimal): 0x%X\n", + temp32)); + + status = AE_AML_NUMERIC_OVERFLOW; + goto cleanup; + } + + /* Sum the digit into the result with the current power of 10 */ + + return_desc->integer.value += (((acpi_integer) temp32) * + power_of_ten); + + /* Shift to next BCD digit */ + + digit >>= 4; + + /* Next power of 10 */ + + power_of_ten *= 10; + } + break; + + + case AML_TO_BCD_OP: /* to_bcd (Operand, Result) */ + + return_desc->integer.value = 0; + digit = operand[0]->integer.value; + + /* Each BCD digit is one nybble wide */ + + for (i = 0; (i < acpi_gbl_integer_nybble_width) && (digit > 0); i++) { + (void) acpi_ut_short_divide (digit, 10, &digit, &temp32); + + /* Insert the BCD digit that resides in the remainder from above */ + + return_desc->integer.value |= (((acpi_integer) temp32) << + ACPI_MUL_4 (i)); + } + + /* Overflow if there is any data left in Digit */ + + if (digit > 0) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Integer too large to convert to BCD: %8.8X%8.8X\n", + ACPI_FORMAT_UINT64 (operand[0]->integer.value))); + status = AE_AML_NUMERIC_OVERFLOW; + goto cleanup; + } + break; + + + case AML_COND_REF_OF_OP: /* cond_ref_of (source_object, Result) */ + + /* + * This op is a little strange because the internal return value is + * different than the return value stored in the result descriptor + * (There are really two return values) + */ + if ((struct acpi_namespace_node *) operand[0] == acpi_gbl_root_node) { + /* + * This means that the object does not exist in the namespace, + * return FALSE + */ + return_desc->integer.value = 0; + goto cleanup; + } + + /* Get the object reference, store it, and remove our reference */ + + status = acpi_ex_get_object_reference (operand[0], &return_desc2, walk_state); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + status = acpi_ex_store (return_desc2, operand[1], walk_state); + acpi_ut_remove_reference (return_desc2); + + /* The object exists in the namespace, return TRUE */ + + return_desc->integer.value = ACPI_INTEGER_MAX; + goto cleanup; + + + default: + /* No other opcodes get here */ + break; + } + break; + + + case AML_STORE_OP: /* Store (Source, Target) */ + + /* + * A store operand is typically a number, string, buffer or lvalue + * Be careful about deleting the source object, + * since the object itself may have been stored. + */ + status = acpi_ex_store (operand[0], operand[1], walk_state); + if (ACPI_FAILURE (status)) { + return_ACPI_STATUS (status); + } + + /* It is possible that the Store already produced a return object */ + + if (!walk_state->result_obj) { + /* + * Normally, we would remove a reference on the Operand[0] parameter; + * But since it is being used as the internal return object + * (meaning we would normally increment it), the two cancel out, + * and we simply don't do anything. + */ + walk_state->result_obj = operand[0]; + walk_state->operands[0] = NULL; /* Prevent deletion */ + } + return_ACPI_STATUS (status); + + + /* + * ACPI 2.0 Opcodes + */ + case AML_COPY_OP: /* Copy (Source, Target) */ + + status = acpi_ut_copy_iobject_to_iobject (operand[0], &return_desc, + walk_state); + break; + + + case AML_TO_DECSTRING_OP: /* to_decimal_string (Data, Result) */ + + status = acpi_ex_convert_to_string (operand[0], &return_desc, + ACPI_EXPLICIT_CONVERT_DECIMAL); + if (return_desc == operand[0]) { + /* No conversion performed, add ref to handle return value */ + acpi_ut_add_reference (return_desc); + } + break; + + + case AML_TO_HEXSTRING_OP: /* to_hex_string (Data, Result) */ + + status = acpi_ex_convert_to_string (operand[0], &return_desc, + ACPI_EXPLICIT_CONVERT_HEX); + if (return_desc == operand[0]) { + /* No conversion performed, add ref to handle return value */ + acpi_ut_add_reference (return_desc); + } + break; + + + case AML_TO_BUFFER_OP: /* to_buffer (Data, Result) */ + + status = acpi_ex_convert_to_buffer (operand[0], &return_desc); + if (return_desc == operand[0]) { + /* No conversion performed, add ref to handle return value */ + acpi_ut_add_reference (return_desc); + } + break; + + + case AML_TO_INTEGER_OP: /* to_integer (Data, Result) */ + + status = acpi_ex_convert_to_integer (operand[0], &return_desc, + ACPI_ANY_BASE); + if (return_desc == operand[0]) { + /* No conversion performed, add ref to handle return value */ + acpi_ut_add_reference (return_desc); + } + break; + + + case AML_SHIFT_LEFT_BIT_OP: /* shift_left_bit (Source, bit_num) */ + case AML_SHIFT_RIGHT_BIT_OP: /* shift_right_bit (Source, bit_num) */ + + /* + * These are two obsolete opcodes + */ + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "%s is obsolete and not implemented\n", + acpi_ps_get_opcode_name (walk_state->opcode))); + status = AE_SUPPORT; + goto cleanup; + + + default: /* Unknown opcode */ + + ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_1T_1R: Unknown opcode %X\n", + walk_state->opcode)); + status = AE_AML_BAD_OPCODE; + goto cleanup; + } + + if (ACPI_SUCCESS (status)) { + /* + * Store the return value computed above into the target object + */ + status = acpi_ex_store (return_desc, operand[1], walk_state); + } + + +cleanup: + + if (!walk_state->result_obj) { + walk_state->result_obj = return_desc; + } + + /* Delete return object on error */ + + if (ACPI_FAILURE (status)) { + acpi_ut_remove_reference (return_desc); + } + + return_ACPI_STATUS (status); +} + + +/******************************************************************************* + * + * FUNCTION: acpi_ex_opcode_1A_0T_1R + * + * PARAMETERS: walk_state - Current state (contains AML opcode) + * + * RETURN: Status + * + * DESCRIPTION: Execute opcode with one argument, no target, and a return value + * + ******************************************************************************/ + +acpi_status +acpi_ex_opcode_1A_0T_1R ( + struct acpi_walk_state *walk_state) +{ + union acpi_operand_object **operand = &walk_state->operands[0]; + union acpi_operand_object *temp_desc; + union acpi_operand_object *return_desc = NULL; + acpi_status status = AE_OK; + u32 type; + acpi_integer value; + + + ACPI_FUNCTION_TRACE_STR ("ex_opcode_1A_0T_1R", acpi_ps_get_opcode_name (walk_state->opcode)); + + + /* Examine the AML opcode */ + + switch (walk_state->opcode) { + case AML_LNOT_OP: /* LNot (Operand) */ + + return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + /* + * Set result to ONES (TRUE) if Value == 0. Note: + * return_desc->Integer.Value is initially == 0 (FALSE) from above. + */ + if (!operand[0]->integer.value) { + return_desc->integer.value = ACPI_INTEGER_MAX; + } + break; + + + case AML_DECREMENT_OP: /* Decrement (Operand) */ + case AML_INCREMENT_OP: /* Increment (Operand) */ + + /* + * Create a new integer. Can't just get the base integer and + * increment it because it may be an Arg or Field. + */ + return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + /* + * Since we are expecting a Reference operand, it can be either a + * NS Node or an internal object. + */ + temp_desc = operand[0]; + if (ACPI_GET_DESCRIPTOR_TYPE (temp_desc) == ACPI_DESC_TYPE_OPERAND) { + /* Internal reference object - prevent deletion */ + + acpi_ut_add_reference (temp_desc); + } + + /* + * Convert the Reference operand to an Integer (This removes a + * reference on the Operand[0] object) + * + * NOTE: We use LNOT_OP here in order to force resolution of the + * reference operand to an actual integer. + */ + status = acpi_ex_resolve_operands (AML_LNOT_OP, &temp_desc, walk_state); + if (ACPI_FAILURE (status)) { + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "%s: bad operand(s) %s\n", + acpi_ps_get_opcode_name (walk_state->opcode), + acpi_format_exception(status))); + + goto cleanup; + } + + /* + * temp_desc is now guaranteed to be an Integer object -- + * Perform the actual increment or decrement + */ + if (walk_state->opcode == AML_INCREMENT_OP) { + return_desc->integer.value = temp_desc->integer.value +1; + } + else { + return_desc->integer.value = temp_desc->integer.value -1; + } + + /* Finished with this Integer object */ + + acpi_ut_remove_reference (temp_desc); + + /* + * Store the result back (indirectly) through the original + * Reference object + */ + status = acpi_ex_store (return_desc, operand[0], walk_state); + break; + + + case AML_TYPE_OP: /* object_type (source_object) */ + + /* + * Note: The operand is not resolved at this point because we want to + * get the associated object, not its value. For example, we don't want + * to resolve a field_unit to its value, we want the actual field_unit + * object. + */ + + /* Get the type of the base object */ + + status = acpi_ex_resolve_multiple (walk_state, operand[0], &type, NULL); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + /* Allocate a descriptor to hold the type. */ + + return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + return_desc->integer.value = type; + break; + + + case AML_SIZE_OF_OP: /* size_of (source_object) */ + + /* + * Note: The operand is not resolved at this point because we want to + * get the associated object, not its value. + */ + + /* Get the base object */ + + status = acpi_ex_resolve_multiple (walk_state, operand[0], &type, &temp_desc); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + /* + * The type of the base object must be integer, buffer, string, or + * package. All others are not supported. + * + * NOTE: Integer is not specifically supported by the ACPI spec, + * but is supported implicitly via implicit operand conversion. + * rather than bother with conversion, we just use the byte width + * global (4 or 8 bytes). + */ + switch (type) { + case ACPI_TYPE_INTEGER: + value = acpi_gbl_integer_byte_width; + break; + + case ACPI_TYPE_BUFFER: + value = temp_desc->buffer.length; + break; + + case ACPI_TYPE_STRING: + value = temp_desc->string.length; + break; + + case ACPI_TYPE_PACKAGE: + value = temp_desc->package.count; + break; + + default: + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "size_of - Operand is not Buf/Int/Str/Pkg - found type %s\n", + acpi_ut_get_type_name (type))); + status = AE_AML_OPERAND_TYPE; + goto cleanup; + } + + /* + * Now that we have the size of the object, create a result + * object to hold the value + */ + return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + return_desc->integer.value = value; + break; + + + case AML_REF_OF_OP: /* ref_of (source_object) */ + + status = acpi_ex_get_object_reference (operand[0], &return_desc, walk_state); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + break; + + + case AML_DEREF_OF_OP: /* deref_of (obj_reference | String) */ + + /* Check for a method local or argument, or standalone String */ + + if (ACPI_GET_DESCRIPTOR_TYPE (operand[0]) != ACPI_DESC_TYPE_NAMED) { + switch (ACPI_GET_OBJECT_TYPE (operand[0])) { + case ACPI_TYPE_LOCAL_REFERENCE: + /* + * This is a deref_of (local_x | arg_x) + * + * Must resolve/dereference the local/arg reference first + */ + switch (operand[0]->reference.opcode) { + case AML_LOCAL_OP: + case AML_ARG_OP: + + /* Set Operand[0] to the value of the local/arg */ + + status = acpi_ds_method_data_get_value (operand[0]->reference.opcode, + operand[0]->reference.offset, walk_state, &temp_desc); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + /* + * Delete our reference to the input object and + * point to the object just retrieved + */ + acpi_ut_remove_reference (operand[0]); + operand[0] = temp_desc; + break; + + case AML_REF_OF_OP: + + /* Get the object to which the reference refers */ + + temp_desc = operand[0]->reference.object; + acpi_ut_remove_reference (operand[0]); + operand[0] = temp_desc; + break; + + default: + + /* Must be an Index op - handled below */ + break; + } + break; + + + case ACPI_TYPE_STRING: + + /* + * This is a deref_of (String). The string is a reference to a named ACPI object. + * + * 1) Find the owning Node + * 2) Dereference the node to an actual object. Could be a Field, so we nee + * to resolve the node to a value. + */ + status = acpi_ns_get_node_by_path (operand[0]->string.pointer, + walk_state->scope_info->scope.node, ACPI_NS_SEARCH_PARENT, + ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &return_desc)); + if (ACPI_FAILURE (status)) { + goto cleanup; + } + + status = acpi_ex_resolve_node_to_value ( + ACPI_CAST_INDIRECT_PTR (struct acpi_namespace_node, &return_desc), walk_state); + goto cleanup; + + + default: + + status = AE_AML_OPERAND_TYPE; + goto cleanup; + } + } + + /* Operand[0] may have changed from the code above */ + + if (ACPI_GET_DESCRIPTOR_TYPE (operand[0]) == ACPI_DESC_TYPE_NAMED) { + /* + * This is a deref_of (object_reference) + * Get the actual object from the Node (This is the dereference). + * -- This case may only happen when a local_x or arg_x is dereferenced above. + */ + return_desc = acpi_ns_get_attached_object ((struct acpi_namespace_node *) operand[0]); + } + else { + /* + * This must be a reference object produced by either the Index() or + * ref_of() operator + */ + switch (operand[0]->reference.opcode) { + case AML_INDEX_OP: + + /* + * The target type for the Index operator must be + * either a Buffer or a Package + */ + switch (operand[0]->reference.target_type) { + case ACPI_TYPE_BUFFER_FIELD: + + temp_desc = operand[0]->reference.object; + + /* + * Create a new object that contains one element of the + * buffer -- the element pointed to by the index. + * + * NOTE: index into a buffer is NOT a pointer to a + * sub-buffer of the main buffer, it is only a pointer to a + * single element (byte) of the buffer! + */ + return_desc = acpi_ut_create_internal_object (ACPI_TYPE_INTEGER); + if (!return_desc) { + status = AE_NO_MEMORY; + goto cleanup; + } + + /* + * Since we are returning the value of the buffer at the + * indexed location, we don't need to add an additional + * reference to the buffer itself. + */ + return_desc->integer.value = + temp_desc->buffer.pointer[operand[0]->reference.offset]; + break; + + + case ACPI_TYPE_PACKAGE: + + /* + * Return the referenced element of the package. We must add + * another reference to the referenced object, however. + */ + return_desc = *(operand[0]->reference.where); + if (!return_desc) { + /* + * We can't return a NULL dereferenced value. This is + * an uninitialized package element and is thus a + * severe error. + */ + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "NULL package element obj %p\n", + operand[0])); + status = AE_AML_UNINITIALIZED_ELEMENT; + goto cleanup; + } + + acpi_ut_add_reference (return_desc); + break; + + + default: + + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Unknown Index target_type %X in obj %p\n", + operand[0]->reference.target_type, operand[0])); + status = AE_AML_OPERAND_TYPE; + goto cleanup; + } + break; + + + case AML_REF_OF_OP: + + return_desc = operand[0]->reference.object; + + if (ACPI_GET_DESCRIPTOR_TYPE (return_desc) == ACPI_DESC_TYPE_NAMED) { + + return_desc = acpi_ns_get_attached_object ((struct acpi_namespace_node *) return_desc); + } + + /* Add another reference to the object! */ + + acpi_ut_add_reference (return_desc); + break; + + + default: + ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, + "Unknown opcode in ref(%p) - %X\n", + operand[0], operand[0]->reference.opcode)); + + status = AE_TYPE; + goto cleanup; + } + } + break; + + + default: + + ACPI_REPORT_ERROR (("acpi_ex_opcode_1A_0T_1R: Unknown opcode %X\n", + walk_state->opcode)); + status = AE_AML_BAD_OPCODE; + goto cleanup; + } + + +cleanup: + + /* Delete return object on error */ + + if (ACPI_FAILURE (status)) { + acpi_ut_remove_reference (return_desc); + } + + walk_state->result_obj = return_desc; + return_ACPI_STATUS (status); +} + |