// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
/******************************************************************************
 *
 * Module Name: dsopcode - Dispatcher support for regions and fields
 *
 * Copyright (C) 2000 - 2025, Intel Corp.
 *
 *****************************************************************************/

#include <acpi/acpi.h>
#include "accommon.h"
#include "acparser.h"
#include "amlcode.h"
#include "acdispat.h"
#include "acinterp.h"
#include "acnamesp.h"
#include "acevents.h"
#include "actables.h"

#define _COMPONENT          ACPI_DISPATCHER
ACPI_MODULE_NAME("dsopcode")

/* Local prototypes */
static acpi_status
acpi_ds_init_buffer_field(u16 aml_opcode,
                          union acpi_operand_object *obj_desc,
                          union acpi_operand_object *buffer_desc,
                          union acpi_operand_object *offset_desc,
                          union acpi_operand_object *length_desc,
                          union acpi_operand_object *result_desc);

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_initialize_region
 *
 * PARAMETERS:  obj_handle      - Region namespace node
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Front end to ev_initialize_region
 *
 ******************************************************************************/

acpi_status acpi_ds_initialize_region(acpi_handle obj_handle)
{
        union acpi_operand_object *obj_desc;
        acpi_status status;

        obj_desc = acpi_ns_get_attached_object(obj_handle);

        /* Namespace is NOT locked */

        status = acpi_ev_initialize_region(obj_desc);
        return (status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_init_buffer_field
 *
 * PARAMETERS:  aml_opcode      - create_xxx_field
 *              obj_desc        - buffer_field object
 *              buffer_desc     - Host Buffer
 *              offset_desc     - Offset into buffer
 *              length_desc     - Length of field (CREATE_FIELD_OP only)
 *              result_desc     - Where to store the result
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Perform actual initialization of a buffer field
 *
 ******************************************************************************/

static acpi_status
acpi_ds_init_buffer_field(u16 aml_opcode,
                          union acpi_operand_object *obj_desc,
                          union acpi_operand_object *buffer_desc,
                          union acpi_operand_object *offset_desc,
                          union acpi_operand_object *length_desc,
                          union acpi_operand_object *result_desc)
{
        u32 offset;
        u32 bit_offset;
        u32 bit_count;
        u8 field_flags;
        acpi_status status;

        ACPI_FUNCTION_TRACE_PTR(ds_init_buffer_field, obj_desc);

        /* Host object must be a Buffer */

        if (buffer_desc->common.type != ACPI_TYPE_BUFFER) {
                ACPI_ERROR((AE_INFO,
                            "Target of Create Field is not a Buffer object - %s",
                            acpi_ut_get_object_type_name(buffer_desc)));

                status = AE_AML_OPERAND_TYPE;
                goto cleanup;
        }

        /*
         * The last parameter to all of these opcodes (result_desc) started
         * out as a name_string, and should therefore now be a NS node
         * after resolution in acpi_ex_resolve_operands().
         */
        if (ACPI_GET_DESCRIPTOR_TYPE(result_desc) != ACPI_DESC_TYPE_NAMED) {
                ACPI_ERROR((AE_INFO,
                            "(%s) destination not a NS Node [%s]",
                            acpi_ps_get_opcode_name(aml_opcode),
                            acpi_ut_get_descriptor_name(result_desc)));

                status = AE_AML_OPERAND_TYPE;
                goto cleanup;
        }

        offset = (u32) offset_desc->integer.value;

        /*
         * Setup the Bit offsets and counts, according to the opcode
         */
        switch (aml_opcode) {
        case AML_CREATE_FIELD_OP:

                /* Offset is in bits, count is in bits */

                field_flags = AML_FIELD_ACCESS_BYTE;
                bit_offset = offset;
                bit_count = (u32) length_desc->integer.value;

                /* Must have a valid (>0) bit count */

                if (bit_count == 0) {
                        ACPI_BIOS_ERROR((AE_INFO,
                                         "Attempt to CreateField of length zero"));
                        status = AE_AML_OPERAND_VALUE;
                        goto cleanup;
                }
                break;

        case AML_CREATE_BIT_FIELD_OP:

                /* Offset is in bits, Field is one bit */

                bit_offset = offset;
                bit_count = 1;
                field_flags = AML_FIELD_ACCESS_BYTE;
                break;

        case AML_CREATE_BYTE_FIELD_OP:

                /* Offset is in bytes, field is one byte */

                bit_offset = 8 * offset;
                bit_count = 8;
                field_flags = AML_FIELD_ACCESS_BYTE;
                break;

        case AML_CREATE_WORD_FIELD_OP:

                /* Offset is in bytes, field is one word */

                bit_offset = 8 * offset;
                bit_count = 16;
                field_flags = AML_FIELD_ACCESS_WORD;
                break;

        case AML_CREATE_DWORD_FIELD_OP:

                /* Offset is in bytes, field is one dword */

                bit_offset = 8 * offset;
                bit_count = 32;
                field_flags = AML_FIELD_ACCESS_DWORD;
                break;

        case AML_CREATE_QWORD_FIELD_OP:

                /* Offset is in bytes, field is one qword */

                bit_offset = 8 * offset;
                bit_count = 64;
                field_flags = AML_FIELD_ACCESS_QWORD;
                break;

        default:

                ACPI_ERROR((AE_INFO,
                            "Unknown field creation opcode 0x%02X",
                            aml_opcode));
                status = AE_AML_BAD_OPCODE;
                goto cleanup;
        }

        /* Entire field must fit within the current length of the buffer */

        if ((bit_offset + bit_count) > (8 * (u32)buffer_desc->buffer.length)) {
                status = AE_AML_BUFFER_LIMIT;
                ACPI_BIOS_EXCEPTION((AE_INFO, status,
                                     "Field [%4.4s] at bit offset/length %u/%u "
                                     "exceeds size of target Buffer (%u bits)",
                                     acpi_ut_get_node_name(result_desc),
                                     bit_offset, bit_count,
                                     8 * (u32)buffer_desc->buffer.length));
                goto cleanup;
        }

        /*
         * Initialize areas of the field object that are common to all fields
         * For field_flags, use LOCK_RULE = 0 (NO_LOCK),
         * UPDATE_RULE = 0 (UPDATE_PRESERVE)
         */
        status =
            acpi_ex_prep_common_field_object(obj_desc, field_flags, 0,
                                             bit_offset, bit_count);
        if (ACPI_FAILURE(status)) {
                goto cleanup;
        }

        obj_desc->buffer_field.buffer_obj = buffer_desc;
        obj_desc->buffer_field.is_create_field =
            aml_opcode == AML_CREATE_FIELD_OP;

        /* Reference count for buffer_desc inherits obj_desc count */

        buffer_desc->common.reference_count = (u16)
            (buffer_desc->common.reference_count +
             obj_desc->common.reference_count);

cleanup:

        /* Always delete the operands */

        acpi_ut_remove_reference(offset_desc);
        acpi_ut_remove_reference(buffer_desc);

        if (aml_opcode == AML_CREATE_FIELD_OP) {
                acpi_ut_remove_reference(length_desc);
        }

        /* On failure, delete the result descriptor */

        if (ACPI_FAILURE(status)) {
                acpi_ut_remove_reference(result_desc);  /* Result descriptor */
        } else {
                /* Now the address and length are valid for this buffer_field */

                obj_desc->buffer_field.flags |= AOPOBJ_DATA_VALID;
        }

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_buffer_field_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              op              - A valid buffer_field Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get buffer_field Buffer and Index
 *              Called from acpi_ds_exec_end_op during buffer_field parse tree walk
 *
 ******************************************************************************/

acpi_status
acpi_ds_eval_buffer_field_operands(struct acpi_walk_state *walk_state,
                                   union acpi_parse_object *op)
{
        acpi_status status;
        union acpi_operand_object *obj_desc;
        struct acpi_namespace_node *node;
        union acpi_parse_object *next_op;

        ACPI_FUNCTION_TRACE_PTR(ds_eval_buffer_field_operands, op);

        /*
         * This is where we evaluate the address and length fields of the
         * create_xxx_field declaration
         */
        node = op->common.node;

        /* next_op points to the op that holds the Buffer */

        next_op = op->common.value.arg;

        /* Evaluate/create the address and length operands */

        status = acpi_ds_create_operands(walk_state, next_op);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        obj_desc = acpi_ns_get_attached_object(node);
        if (!obj_desc) {
                return_ACPI_STATUS(AE_NOT_EXIST);
        }

        /* Resolve the operands */

        status =
            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
                                     walk_state);
        if (ACPI_FAILURE(status)) {
                ACPI_ERROR((AE_INFO, "(%s) bad operand(s), status 0x%X",
                            acpi_ps_get_opcode_name(op->common.aml_opcode),
                            status));

                return_ACPI_STATUS(status);
        }

        /* Initialize the Buffer Field */

        if (op->common.aml_opcode == AML_CREATE_FIELD_OP) {

                /* NOTE: Slightly different operands for this opcode */

                status =
                    acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
                                              walk_state->operands[0],
                                              walk_state->operands[1],
                                              walk_state->operands[2],
                                              walk_state->operands[3]);
        } else {
                /* All other, create_xxx_field opcodes */

                status =
                    acpi_ds_init_buffer_field(op->common.aml_opcode, obj_desc,
                                              walk_state->operands[0],
                                              walk_state->operands[1], NULL,
                                              walk_state->operands[2]);
        }

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_region_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              op              - A valid region Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get region address and length
 *              Called from acpi_ds_exec_end_op during op_region parse tree walk
 *
 ******************************************************************************/

acpi_status
acpi_ds_eval_region_operands(struct acpi_walk_state *walk_state,
                             union acpi_parse_object *op)
{
        acpi_status status;
        union acpi_operand_object *obj_desc;
        union acpi_operand_object *operand_desc;
        struct acpi_namespace_node *node;
        union acpi_parse_object *next_op;
        acpi_adr_space_type space_id;

        ACPI_FUNCTION_TRACE_PTR(ds_eval_region_operands, op);

        /*
         * This is where we evaluate the address and length fields of the
         * op_region declaration
         */
        node = op->common.node;

        /* next_op points to the op that holds the space_ID */

        next_op = op->common.value.arg;
        space_id = (acpi_adr_space_type)next_op->common.value.integer;

        /* next_op points to address op */

        next_op = next_op->common.next;

        /* Evaluate/create the address and length operands */

        status = acpi_ds_create_operands(walk_state, next_op);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /* Resolve the length and address operands to numbers */

        status =
            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
                                     walk_state);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        obj_desc = acpi_ns_get_attached_object(node);
        if (!obj_desc) {
                return_ACPI_STATUS(AE_NOT_EXIST);
        }

        /*
         * Get the length operand and save it
         * (at Top of stack)
         */
        operand_desc = walk_state->operands[walk_state->num_operands - 1];

        obj_desc->region.length = (u32) operand_desc->integer.value;
        acpi_ut_remove_reference(operand_desc);

        /* A zero-length operation region is unusable. Just warn */

        if (!obj_desc->region.length
            && (space_id < ACPI_NUM_PREDEFINED_REGIONS)) {
                ACPI_WARNING((AE_INFO,
                              "Operation Region [%4.4s] has zero length (SpaceId %X)",
                              node->name.ascii, space_id));
        }

        /*
         * Get the address and save it
         * (at top of stack - 1)
         */
        operand_desc = walk_state->operands[walk_state->num_operands - 2];

        obj_desc->region.address = (acpi_physical_address)
            operand_desc->integer.value;
        acpi_ut_remove_reference(operand_desc);

        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
                          obj_desc,
                          ACPI_FORMAT_UINT64(obj_desc->region.address),
                          obj_desc->region.length));

        status = acpi_ut_add_address_range(obj_desc->region.space_id,
                                           obj_desc->region.address,
                                           obj_desc->region.length, node);

        /* Now the address and length are valid for this opregion */

        obj_desc->region.flags |= AOPOBJ_DATA_VALID;
        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_table_region_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              op              - A valid region Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get region address and length.
 *              Called from acpi_ds_exec_end_op during data_table_region parse
 *              tree walk.
 *
 ******************************************************************************/

acpi_status
acpi_ds_eval_table_region_operands(struct acpi_walk_state *walk_state,
                                   union acpi_parse_object *op)
{
        acpi_status status;
        union acpi_operand_object *obj_desc;
        union acpi_operand_object **operand;
        struct acpi_namespace_node *node;
        union acpi_parse_object *next_op;
        struct acpi_table_header *table;
        u32 table_index;

        ACPI_FUNCTION_TRACE_PTR(ds_eval_table_region_operands, op);

        /*
         * This is where we evaluate the Signature string, oem_id string,
         * and oem_table_id string of the Data Table Region declaration
         */
        node = op->common.node;

        /* next_op points to Signature string op */

        next_op = op->common.value.arg;

        /*
         * Evaluate/create the Signature string, oem_id string,
         * and oem_table_id string operands
         */
        status = acpi_ds_create_operands(walk_state, next_op);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        operand = &walk_state->operands[0];

        /*
         * Resolve the Signature string, oem_id string,
         * and oem_table_id string operands
         */
        status =
            acpi_ex_resolve_operands(op->common.aml_opcode, ACPI_WALK_OPERANDS,
                                     walk_state);
        if (ACPI_FAILURE(status)) {
                goto cleanup;
        }

        /* Find the ACPI table */

        status = acpi_tb_find_table(operand[0]->string.pointer,
                                    operand[1]->string.pointer,
                                    operand[2]->string.pointer, &table_index);
        if (ACPI_FAILURE(status)) {
                if (status == AE_NOT_FOUND) {
                        ACPI_ERROR((AE_INFO,
                                    "ACPI Table [%4.4s] OEM:(%s, %s) not found in RSDT/XSDT",
                                    operand[0]->string.pointer,
                                    operand[1]->string.pointer,
                                    operand[2]->string.pointer));
                }
                goto cleanup;
        }

        status = acpi_get_table_by_index(table_index, &table);
        if (ACPI_FAILURE(status)) {
                goto cleanup;
        }

        obj_desc = acpi_ns_get_attached_object(node);
        if (!obj_desc) {
                status = AE_NOT_EXIST;
                goto cleanup;
        }

        obj_desc->region.address = ACPI_PTR_TO_PHYSADDR(table);
        obj_desc->region.length = table->length;
        obj_desc->region.pointer = table;

        ACPI_DEBUG_PRINT((ACPI_DB_EXEC, "RgnObj %p Addr %8.8X%8.8X Len %X\n",
                          obj_desc,
                          ACPI_FORMAT_UINT64(obj_desc->region.address),
                          obj_desc->region.length));

        /* Now the address and length are valid for this opregion */

        obj_desc->region.flags |= AOPOBJ_DATA_VALID;

cleanup:
        acpi_ut_remove_reference(operand[0]);
        acpi_ut_remove_reference(operand[1]);
        acpi_ut_remove_reference(operand[2]);

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_data_object_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              op              - A valid data_object Op object
 *              obj_desc        - data_object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get the operands and complete the following data object types:
 *              Buffer, Package.
 *
 ******************************************************************************/

acpi_status
acpi_ds_eval_data_object_operands(struct acpi_walk_state *walk_state,
                                  union acpi_parse_object *op,
                                  union acpi_operand_object *obj_desc)
{
        acpi_status status;
        union acpi_operand_object *arg_desc;
        u32 length;

        ACPI_FUNCTION_TRACE(ds_eval_data_object_operands);

        /* The first operand (for all of these data objects) is the length */

        /*
         * Set proper index into operand stack for acpi_ds_obj_stack_push
         * invoked inside acpi_ds_create_operand.
         */
        walk_state->operand_index = walk_state->num_operands;

        /* Ignore if child is not valid */

        if (!op->common.value.arg) {
                ACPI_ERROR((AE_INFO,
                            "Missing child while evaluating opcode %4.4X, Op %p",
                            op->common.aml_opcode, op));
                return_ACPI_STATUS(AE_OK);
        }

        status = acpi_ds_create_operand(walk_state, op->common.value.arg, 1);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        status = acpi_ex_resolve_operands(walk_state->opcode,
                                          &(walk_state->
                                            operands[walk_state->num_operands -
                                                     1]), walk_state);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        /* Extract length operand */

        arg_desc = walk_state->operands[walk_state->num_operands - 1];
        length = (u32) arg_desc->integer.value;

        /* Cleanup for length operand */

        status = acpi_ds_obj_stack_pop(1, walk_state);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        acpi_ut_remove_reference(arg_desc);

        /*
         * Create the actual data object
         */
        switch (op->common.aml_opcode) {
        case AML_BUFFER_OP:

                status =
                    acpi_ds_build_internal_buffer_obj(walk_state, op, length,
                                                      &obj_desc);
                break;

        case AML_PACKAGE_OP:
        case AML_VARIABLE_PACKAGE_OP:

                status =
                    acpi_ds_build_internal_package_obj(walk_state, op, length,
                                                       &obj_desc);
                break;

        default:

                return_ACPI_STATUS(AE_AML_BAD_OPCODE);
        }

        if (ACPI_SUCCESS(status)) {
                /*
                 * Return the object in the walk_state, unless the parent is a package -
                 * in this case, the return object will be stored in the parse tree
                 * for the package.
                 */
                if ((!op->common.parent) ||
                    ((op->common.parent->common.aml_opcode != AML_PACKAGE_OP) &&
                     (op->common.parent->common.aml_opcode !=
                      AML_VARIABLE_PACKAGE_OP)
                     && (op->common.parent->common.aml_opcode !=
                         AML_NAME_OP))) {
                        walk_state->result_obj = obj_desc;
                }
        }

        return_ACPI_STATUS(status);
}

/*******************************************************************************
 *
 * FUNCTION:    acpi_ds_eval_bank_field_operands
 *
 * PARAMETERS:  walk_state      - Current walk
 *              op              - A valid bank_field Op object
 *
 * RETURN:      Status
 *
 * DESCRIPTION: Get bank_field bank_value
 *              Called from acpi_ds_exec_end_op during bank_field parse tree walk
 *
 ******************************************************************************/

acpi_status
acpi_ds_eval_bank_field_operands(struct acpi_walk_state *walk_state,
                                 union acpi_parse_object *op)
{
        acpi_status status;
        union acpi_operand_object *obj_desc;
        union acpi_operand_object *operand_desc;
        struct acpi_namespace_node *node;
        union acpi_parse_object *next_op;
        union acpi_parse_object *arg;

        ACPI_FUNCTION_TRACE_PTR(ds_eval_bank_field_operands, op);

        /*
         * This is where we evaluate the bank_value field of the
         * bank_field declaration
         */

        /* next_op points to the op that holds the Region */

        next_op = op->common.value.arg;

        /* next_op points to the op that holds the Bank Register */

        next_op = next_op->common.next;

        /* next_op points to the op that holds the Bank Value */

        next_op = next_op->common.next;

        /*
         * Set proper index into operand stack for acpi_ds_obj_stack_push
         * invoked inside acpi_ds_create_operand.
         *
         * We use walk_state->Operands[0] to store the evaluated bank_value
         */
        walk_state->operand_index = 0;

        status = acpi_ds_create_operand(walk_state, next_op, 0);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        status = acpi_ex_resolve_to_value(&walk_state->operands[0], walk_state);
        if (ACPI_FAILURE(status)) {
                return_ACPI_STATUS(status);
        }

        ACPI_DUMP_OPERANDS(ACPI_WALK_OPERANDS,
                           acpi_ps_get_opcode_name(op->common.aml_opcode), 1);
        /*
         * Get the bank_value operand and save it
         * (at Top of stack)
         */
        operand_desc = walk_state->operands[0];

        /* Arg points to the start Bank Field */

        arg = acpi_ps_get_arg(op, 4);
        while (arg) {

                /* Ignore OFFSET and ACCESSAS terms here */

                if (arg->common.aml_opcode == AML_INT_NAMEDFIELD_OP) {
                        node = arg->common.node;

                        obj_desc = acpi_ns_get_attached_object(node);
                        if (!obj_desc) {
                                return_ACPI_STATUS(AE_NOT_EXIST);
                        }

                        obj_desc->bank_field.value =
                            (u32) operand_desc->integer.value;
                }

                /* Move to next field in the list */

                arg = arg->common.next;
        }

        acpi_ut_remove_reference(operand_desc);
        return_ACPI_STATUS(status);
}