ACPICA: create acpica/ directory

also, delete sleep/ and delete ACPI_CFLAGS from Makefile

Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 961 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/exfldio.c b/drivers/acpi/acpica/exfldio.c
new file mode 100644
index 000000000000..33cd17a1064f
--- /dev/null
+++ b/drivers/acpi/acpica/exfldio.c
@@ -0,0 +1,961 @@
+/******************************************************************************
+ *
+ * Module Name: exfldio - Aml Field I/O
+ *
+ *****************************************************************************/
+
+/*
+ * 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/acevents.h>
+#include <acpi/acdispat.h>
+
+#define _COMPONENT          ACPI_EXECUTER
+ACPI_MODULE_NAME("exfldio")
+
+/* Local prototypes */
+static acpi_status
+acpi_ex_field_datum_io(union acpi_operand_object *obj_desc,
+                       u32 field_datum_byte_offset,
+                       acpi_integer * value, u32 read_write);
+
+static u8
+acpi_ex_register_overflow(union acpi_operand_object *obj_desc,
+                          acpi_integer value);
+
+static acpi_status
+acpi_ex_setup_region(union acpi_operand_object *obj_desc,
+                     u32 field_datum_byte_offset);
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_setup_region
+ *
+ * PARAMETERS:  obj_desc                - Field to be read or written
+ *              field_datum_byte_offset - Byte offset of this datum within the
+ *                                        parent field
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Common processing for acpi_ex_extract_from_field and
+ *              acpi_ex_insert_into_field. Initialize the Region if necessary and
+ *              validate the request.
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_setup_region(union acpi_operand_object *obj_desc,
+                     u32 field_datum_byte_offset)
+{
+        acpi_status status = AE_OK;
+        union acpi_operand_object *rgn_desc;
+
+        ACPI_FUNCTION_TRACE_U32(ex_setup_region, field_datum_byte_offset);
+
+        rgn_desc = obj_desc->common_field.region_obj;
+
+        /* We must have a valid region */
+
+        if (ACPI_GET_OBJECT_TYPE(rgn_desc) != ACPI_TYPE_REGION) {
+                ACPI_ERROR((AE_INFO, "Needed Region, found type %X (%s)",
+                            ACPI_GET_OBJECT_TYPE(rgn_desc),
+                            acpi_ut_get_object_type_name(rgn_desc)));
+
+                return_ACPI_STATUS(AE_AML_OPERAND_TYPE);
+        }
+
+        /*
+         * If the Region Address and Length have not been previously evaluated,
+         * evaluate them now and save the results.
+         */
+        if (!(rgn_desc->common.flags & AOPOBJ_DATA_VALID)) {
+                status = acpi_ds_get_region_arguments(rgn_desc);
+                if (ACPI_FAILURE(status)) {
+                        return_ACPI_STATUS(status);
+                }
+        }
+
+        /* Exit if Address/Length have been disallowed by the host OS */
+
+        if (rgn_desc->common.flags & AOPOBJ_INVALID) {
+                return_ACPI_STATUS(AE_AML_ILLEGAL_ADDRESS);
+        }
+
+        /*
+         * Exit now for SMBus address space, it has a non-linear address space
+         * and the request cannot be directly validated
+         */
+        if (rgn_desc->region.space_id == ACPI_ADR_SPACE_SMBUS) {
+
+                /* SMBus has a non-linear address space */
+
+                return_ACPI_STATUS(AE_OK);
+        }
+#ifdef ACPI_UNDER_DEVELOPMENT
+        /*
+         * If the Field access is any_acc, we can now compute the optimal
+         * access (because we know know the length of the parent region)
+         */
+        if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
+                if (ACPI_FAILURE(status)) {
+                        return_ACPI_STATUS(status);
+                }
+        }
+#endif
+
+        /*
+         * Validate the request.  The entire request from the byte offset for a
+         * length of one field datum (access width) must fit within the region.
+         * (Region length is specified in bytes)
+         */
+        if (rgn_desc->region.length <
+            (obj_desc->common_field.base_byte_offset +
+             field_datum_byte_offset +
+             obj_desc->common_field.access_byte_width)) {
+                if (acpi_gbl_enable_interpreter_slack) {
+                        /*
+                         * Slack mode only:  We will go ahead and allow access to this
+                         * field if it is within the region length rounded up to the next
+                         * access width boundary. acpi_size cast for 64-bit compile.
+                         */
+                        if (ACPI_ROUND_UP(rgn_desc->region.length,
+                                          obj_desc->common_field.
+                                          access_byte_width) >=
+                            ((acpi_size) obj_desc->common_field.
+                             base_byte_offset +
+                             obj_desc->common_field.access_byte_width +
+                             field_datum_byte_offset)) {
+                                return_ACPI_STATUS(AE_OK);
+                        }
+                }
+
+                if (rgn_desc->region.length <
+                    obj_desc->common_field.access_byte_width) {
+                        /*
+                         * This is the case where the access_type (acc_word, etc.) is wider
+                         * than the region itself.  For example, a region of length one
+                         * byte, and a field with Dword access specified.
+                         */
+                        ACPI_ERROR((AE_INFO,
+                                    "Field [%4.4s] access width (%d bytes) too large for region [%4.4s] (length %X)",
+                                    acpi_ut_get_node_name(obj_desc->
+                                                          common_field.node),
+                                    obj_desc->common_field.access_byte_width,
+                                    acpi_ut_get_node_name(rgn_desc->region.
+                                                          node),
+                                    rgn_desc->region.length));
+                }
+
+                /*
+                 * Offset rounded up to next multiple of field width
+                 * exceeds region length, indicate an error
+                 */
+                ACPI_ERROR((AE_INFO,
+                            "Field [%4.4s] Base+Offset+Width %X+%X+%X is beyond end of region [%4.4s] (length %X)",
+                            acpi_ut_get_node_name(obj_desc->common_field.node),
+                            obj_desc->common_field.base_byte_offset,
+                            field_datum_byte_offset,
+                            obj_desc->common_field.access_byte_width,
+                            acpi_ut_get_node_name(rgn_desc->region.node),
+                            rgn_desc->region.length));
+
+                return_ACPI_STATUS(AE_AML_REGION_LIMIT);
+        }
+
+        return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_access_region
+ *
+ * PARAMETERS:  obj_desc                - Field to be read
+ *              field_datum_byte_offset - Byte offset of this datum within the
+ *                                        parent field
+ *              Value                   - Where to store value (must at least
+ *                                        the size of acpi_integer)
+ *              Function                - Read or Write flag plus other region-
+ *                                        dependent flags
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Read or Write a single field datum to an Operation Region.
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_access_region(union acpi_operand_object *obj_desc,
+                      u32 field_datum_byte_offset,
+                      acpi_integer * value, u32 function)
+{
+        acpi_status status;
+        union acpi_operand_object *rgn_desc;
+        acpi_physical_address address;
+
+        ACPI_FUNCTION_TRACE(ex_access_region);
+
+        /*
+         * Ensure that the region operands are fully evaluated and verify
+         * the validity of the request
+         */
+        status = acpi_ex_setup_region(obj_desc, field_datum_byte_offset);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+
+        /*
+         * The physical address of this field datum is:
+         *
+         * 1) The base of the region, plus
+         * 2) The base offset of the field, plus
+         * 3) The current offset into the field
+         */
+        rgn_desc = obj_desc->common_field.region_obj;
+        address = rgn_desc->region.address +
+            obj_desc->common_field.base_byte_offset + field_datum_byte_offset;
+
+        if ((function & ACPI_IO_MASK) == ACPI_READ) {
+                ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[READ]"));
+        } else {
+                ACPI_DEBUG_PRINT((ACPI_DB_BFIELD, "[WRITE]"));
+        }
+
+        ACPI_DEBUG_PRINT_RAW((ACPI_DB_BFIELD,
+                              " Region [%s:%X], Width %X, ByteBase %X, Offset %X at %p\n",
+                              acpi_ut_get_region_name(rgn_desc->region.
+                                                      space_id),
+                              rgn_desc->region.space_id,
+                              obj_desc->common_field.access_byte_width,
+                              obj_desc->common_field.base_byte_offset,
+                              field_datum_byte_offset, ACPI_CAST_PTR(void,
+                                                                     address)));
+
+        /* Invoke the appropriate address_space/op_region handler */
+
+        status = acpi_ev_address_space_dispatch(rgn_desc, function,
+                                                address,
+                                                ACPI_MUL_8(obj_desc->
+                                                           common_field.
+                                                           access_byte_width),
+                                                value);
+
+        if (ACPI_FAILURE(status)) {
+                if (status == AE_NOT_IMPLEMENTED) {
+                        ACPI_ERROR((AE_INFO,
+                                    "Region %s(%X) not implemented",
+                                    acpi_ut_get_region_name(rgn_desc->region.
+                                                            space_id),
+                                    rgn_desc->region.space_id));
+                } else if (status == AE_NOT_EXIST) {
+                        ACPI_ERROR((AE_INFO,
+                                    "Region %s(%X) has no handler",
+                                    acpi_ut_get_region_name(rgn_desc->region.
+                                                            space_id),
+                                    rgn_desc->region.space_id));
+                }
+        }
+
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_register_overflow
+ *
+ * PARAMETERS:  obj_desc                - Register(Field) to be written
+ *              Value                   - Value to be stored
+ *
+ * RETURN:      TRUE if value overflows the field, FALSE otherwise
+ *
+ * DESCRIPTION: Check if a value is out of range of the field being written.
+ *              Used to check if the values written to Index and Bank registers
+ *              are out of range.  Normally, the value is simply truncated
+ *              to fit the field, but this case is most likely a serious
+ *              coding error in the ASL.
+ *
+ ******************************************************************************/
+
+static u8
+acpi_ex_register_overflow(union acpi_operand_object *obj_desc,
+                          acpi_integer value)
+{
+
+        if (obj_desc->common_field.bit_length >= ACPI_INTEGER_BIT_SIZE) {
+                /*
+                 * The field is large enough to hold the maximum integer, so we can
+                 * never overflow it.
+                 */
+                return (FALSE);
+        }
+
+        if (value >= ((acpi_integer) 1 << obj_desc->common_field.bit_length)) {
+                /*
+                 * The Value is larger than the maximum value that can fit into
+                 * the register.
+                 */
+                return (TRUE);
+        }
+
+        /* The Value will fit into the field with no truncation */
+
+        return (FALSE);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_field_datum_io
+ *
+ * PARAMETERS:  obj_desc                - Field to be read
+ *              field_datum_byte_offset - Byte offset of this datum within the
+ *                                        parent field
+ *              Value                   - Where to store value (must be 64 bits)
+ *              read_write              - Read or Write flag
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Read or Write a single datum of a field.  The field_type is
+ *              demultiplexed here to handle the different types of fields
+ *              (buffer_field, region_field, index_field, bank_field)
+ *
+ ******************************************************************************/
+
+static acpi_status
+acpi_ex_field_datum_io(union acpi_operand_object *obj_desc,
+                       u32 field_datum_byte_offset,
+                       acpi_integer * value, u32 read_write)
+{
+        acpi_status status;
+        acpi_integer local_value;
+
+        ACPI_FUNCTION_TRACE_U32(ex_field_datum_io, field_datum_byte_offset);
+
+        if (read_write == ACPI_READ) {
+                if (!value) {
+                        local_value = 0;
+
+                        /* To support reads without saving return value */
+                        value = &local_value;
+                }
+
+                /* Clear the entire return buffer first, [Very Important!] */
+
+                *value = 0;
+        }
+
+        /*
+         * The four types of fields are:
+         *
+         * buffer_field - Read/write from/to a Buffer
+         * region_field - Read/write from/to a Operation Region.
+         * bank_field  - Write to a Bank Register, then read/write from/to an
+         *               operation_region
+         * index_field - Write to an Index Register, then read/write from/to a
+         *               Data Register
+         */
+        switch (ACPI_GET_OBJECT_TYPE(obj_desc)) {
+        case ACPI_TYPE_BUFFER_FIELD:
+                /*
+                 * If the buffer_field arguments have not been previously evaluated,
+                 * evaluate them now and save the results.
+                 */
+                if (!(obj_desc->common.flags & AOPOBJ_DATA_VALID)) {
+                        status = acpi_ds_get_buffer_field_arguments(obj_desc);
+                        if (ACPI_FAILURE(status)) {
+                                return_ACPI_STATUS(status);
+                        }
+                }
+
+                if (read_write == ACPI_READ) {
+                        /*
+                         * Copy the data from the source buffer.
+                         * Length is the field width in bytes.
+                         */
+                        ACPI_MEMCPY(value,
+                                    (obj_desc->buffer_field.buffer_obj)->buffer.
+                                    pointer +
+                                    obj_desc->buffer_field.base_byte_offset +
+                                    field_datum_byte_offset,
+                                    obj_desc->common_field.access_byte_width);
+                } else {
+                        /*
+                         * Copy the data to the target buffer.
+                         * Length is the field width in bytes.
+                         */
+                        ACPI_MEMCPY((obj_desc->buffer_field.buffer_obj)->buffer.
+                                    pointer +
+                                    obj_desc->buffer_field.base_byte_offset +
+                                    field_datum_byte_offset, value,
+                                    obj_desc->common_field.access_byte_width);
+                }
+
+                status = AE_OK;
+                break;
+
+        case ACPI_TYPE_LOCAL_BANK_FIELD:
+
+                /*
+                 * Ensure that the bank_value is not beyond the capacity of
+                 * the register
+                 */
+                if (acpi_ex_register_overflow(obj_desc->bank_field.bank_obj,
+                                              (acpi_integer) obj_desc->
+                                              bank_field.value)) {
+                        return_ACPI_STATUS(AE_AML_REGISTER_LIMIT);
+                }
+
+                /*
+                 * For bank_fields, we must write the bank_value to the bank_register
+                 * (itself a region_field) before we can access the data.
+                 */
+                status =
+                    acpi_ex_insert_into_field(obj_desc->bank_field.bank_obj,
+                                              &obj_desc->bank_field.value,
+                                              sizeof(obj_desc->bank_field.
+                                                     value));
+                if (ACPI_FAILURE(status)) {
+                        return_ACPI_STATUS(status);
+                }
+
+                /*
+                 * Now that the Bank has been selected, fall through to the
+                 * region_field case and write the datum to the Operation Region
+                 */
+
+                /*lint -fallthrough */
+
+        case ACPI_TYPE_LOCAL_REGION_FIELD:
+                /*
+                 * For simple region_fields, we just directly access the owning
+                 * Operation Region.
+                 */
+                status =
+                    acpi_ex_access_region(obj_desc, field_datum_byte_offset,
+                                          value, read_write);
+                break;
+
+        case ACPI_TYPE_LOCAL_INDEX_FIELD:
+
+                /*
+                 * Ensure that the index_value is not beyond the capacity of
+                 * the register
+                 */
+                if (acpi_ex_register_overflow(obj_desc->index_field.index_obj,
+                                              (acpi_integer) obj_desc->
+                                              index_field.value)) {
+                        return_ACPI_STATUS(AE_AML_REGISTER_LIMIT);
+                }
+
+                /* Write the index value to the index_register (itself a region_field) */
+
+                field_datum_byte_offset += obj_desc->index_field.value;
+
+                ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
+                                  "Write to Index Register: Value %8.8X\n",
+                                  field_datum_byte_offset));
+
+                status =
+                    acpi_ex_insert_into_field(obj_desc->index_field.index_obj,
+                                              &field_datum_byte_offset,
+                                              sizeof(field_datum_byte_offset));
+                if (ACPI_FAILURE(status)) {
+                        return_ACPI_STATUS(status);
+                }
+
+                if (read_write == ACPI_READ) {
+
+                        /* Read the datum from the data_register */
+
+                        ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
+                                          "Read from Data Register\n"));
+
+                        status =
+                            acpi_ex_extract_from_field(obj_desc->index_field.
+                                                       data_obj, value,
+                                                       sizeof(acpi_integer));
+                } else {
+                        /* Write the datum to the data_register */
+
+                        ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
+                                          "Write to Data Register: Value %8.8X%8.8X\n",
+                                          ACPI_FORMAT_UINT64(*value)));
+
+                        status =
+                            acpi_ex_insert_into_field(obj_desc->index_field.
+                                                      data_obj, value,
+                                                      sizeof(acpi_integer));
+                }
+                break;
+
+        default:
+
+                ACPI_ERROR((AE_INFO, "Wrong object type in field I/O %X",
+                            ACPI_GET_OBJECT_TYPE(obj_desc)));
+                status = AE_AML_INTERNAL;
+                break;
+        }
+
+        if (ACPI_SUCCESS(status)) {
+                if (read_write == ACPI_READ) {
+                        ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
+                                          "Value Read %8.8X%8.8X, Width %d\n",
+                                          ACPI_FORMAT_UINT64(*value),
+                                          obj_desc->common_field.
+                                          access_byte_width));
+                } else {
+                        ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
+                                          "Value Written %8.8X%8.8X, Width %d\n",
+                                          ACPI_FORMAT_UINT64(*value),
+                                          obj_desc->common_field.
+                                          access_byte_width));
+                }
+        }
+
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_write_with_update_rule
+ *
+ * PARAMETERS:  obj_desc                - Field to be written
+ *              Mask                    - bitmask within field datum
+ *              field_value             - Value to write
+ *              field_datum_byte_offset - Offset of datum within field
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Apply the field update rule to a field write
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_write_with_update_rule(union acpi_operand_object *obj_desc,
+                               acpi_integer mask,
+                               acpi_integer field_value,
+                               u32 field_datum_byte_offset)
+{
+        acpi_status status = AE_OK;
+        acpi_integer merged_value;
+        acpi_integer current_value;
+
+        ACPI_FUNCTION_TRACE_U32(ex_write_with_update_rule, mask);
+
+        /* Start with the new bits  */
+
+        merged_value = field_value;
+
+        /* If the mask is all ones, we don't need to worry about the update rule */
+
+        if (mask != ACPI_INTEGER_MAX) {
+
+                /* Decode the update rule */
+
+                switch (obj_desc->common_field.
+                        field_flags & AML_FIELD_UPDATE_RULE_MASK) {
+                case AML_FIELD_UPDATE_PRESERVE:
+                        /*
+                         * Check if update rule needs to be applied (not if mask is all
+                         * ones)  The left shift drops the bits we want to ignore.
+                         */
+                        if ((~mask << (ACPI_MUL_8(sizeof(mask)) -
+                                       ACPI_MUL_8(obj_desc->common_field.
+                                                  access_byte_width))) != 0) {
+                                /*
+                                 * Read the current contents of the byte/word/dword containing
+                                 * the field, and merge with the new field value.
+                                 */
+                                status =
+                                    acpi_ex_field_datum_io(obj_desc,
+                                                           field_datum_byte_offset,
+                                                           &current_value,
+                                                           ACPI_READ);
+                                if (ACPI_FAILURE(status)) {
+                                        return_ACPI_STATUS(status);
+                                }
+
+                                merged_value |= (current_value & ~mask);
+                        }
+                        break;
+
+                case AML_FIELD_UPDATE_WRITE_AS_ONES:
+
+                        /* Set positions outside the field to all ones */
+
+                        merged_value |= ~mask;
+                        break;
+
+                case AML_FIELD_UPDATE_WRITE_AS_ZEROS:
+
+                        /* Set positions outside the field to all zeros */
+
+                        merged_value &= mask;
+                        break;
+
+                default:
+
+                        ACPI_ERROR((AE_INFO,
+                                    "Unknown UpdateRule value: %X",
+                                    (obj_desc->common_field.
+                                     field_flags &
+                                     AML_FIELD_UPDATE_RULE_MASK)));
+                        return_ACPI_STATUS(AE_AML_OPERAND_VALUE);
+                }
+        }
+
+        ACPI_DEBUG_PRINT((ACPI_DB_BFIELD,
+                          "Mask %8.8X%8.8X, DatumOffset %X, Width %X, Value %8.8X%8.8X, MergedValue %8.8X%8.8X\n",
+                          ACPI_FORMAT_UINT64(mask),
+                          field_datum_byte_offset,
+                          obj_desc->common_field.access_byte_width,
+                          ACPI_FORMAT_UINT64(field_value),
+                          ACPI_FORMAT_UINT64(merged_value)));
+
+        /* Write the merged value */
+
+        status = acpi_ex_field_datum_io(obj_desc, field_datum_byte_offset,
+                                        &merged_value, ACPI_WRITE);
+
+        return_ACPI_STATUS(status);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_extract_from_field
+ *
+ * PARAMETERS:  obj_desc            - Field to be read
+ *              Buffer              - Where to store the field data
+ *              buffer_length       - Length of Buffer
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Retrieve the current value of the given field
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_extract_from_field(union acpi_operand_object *obj_desc,
+                           void *buffer, u32 buffer_length)
+{
+        acpi_status status;
+        acpi_integer raw_datum;
+        acpi_integer merged_datum;
+        u32 field_offset = 0;
+        u32 buffer_offset = 0;
+        u32 buffer_tail_bits;
+        u32 datum_count;
+        u32 field_datum_count;
+        u32 i;
+
+        ACPI_FUNCTION_TRACE(ex_extract_from_field);
+
+        /* Validate target buffer and clear it */
+
+        if (buffer_length <
+            ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length)) {
+                ACPI_ERROR((AE_INFO,
+                            "Field size %X (bits) is too large for buffer (%X)",
+                            obj_desc->common_field.bit_length, buffer_length));
+
+                return_ACPI_STATUS(AE_BUFFER_OVERFLOW);
+        }
+        ACPI_MEMSET(buffer, 0, buffer_length);
+
+        /* Compute the number of datums (access width data items) */
+
+        datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
+                                       obj_desc->common_field.access_bit_width);
+        field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length +
+                                             obj_desc->common_field.
+                                             start_field_bit_offset,
+                                             obj_desc->common_field.
+                                             access_bit_width);
+
+        /* Priming read from the field */
+
+        status =
+            acpi_ex_field_datum_io(obj_desc, field_offset, &raw_datum,
+                                   ACPI_READ);
+        if (ACPI_FAILURE(status)) {
+                return_ACPI_STATUS(status);
+        }
+        merged_datum =
+            raw_datum >> obj_desc->common_field.start_field_bit_offset;
+
+        /* Read the rest of the field */
+
+        for (i = 1; i < field_datum_count; i++) {
+
+                /* Get next input datum from the field */
+
+                field_offset += obj_desc->common_field.access_byte_width;
+                status = acpi_ex_field_datum_io(obj_desc, field_offset,
+                                                &raw_datum, ACPI_READ);
+                if (ACPI_FAILURE(status)) {
+                        return_ACPI_STATUS(status);
+                }
+
+                /*
+                 * Merge with previous datum if necessary.
+                 *
+                 * Note: Before the shift, check if the shift value will be larger than
+                 * the integer size. If so, there is no need to perform the operation.
+                 * This avoids the differences in behavior between different compilers
+                 * concerning shift values larger than the target data width.
+                 */
+                if ((obj_desc->common_field.access_bit_width -
+                     obj_desc->common_field.start_field_bit_offset) <
+                    ACPI_INTEGER_BIT_SIZE) {
+                        merged_datum |=
+                            raw_datum << (obj_desc->common_field.
+                                          access_bit_width -
+                                          obj_desc->common_field.
+                                          start_field_bit_offset);
+                }
+
+                if (i == datum_count) {
+                        break;
+                }
+
+                /* Write merged datum to target buffer */
+
+                ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum,
+                            ACPI_MIN(obj_desc->common_field.access_byte_width,
+                                     buffer_length - buffer_offset));
+
+                buffer_offset += obj_desc->common_field.access_byte_width;
+                merged_datum =
+                    raw_datum >> obj_desc->common_field.start_field_bit_offset;
+        }
+
+        /* Mask off any extra bits in the last datum */
+
+        buffer_tail_bits = obj_desc->common_field.bit_length %
+            obj_desc->common_field.access_bit_width;
+        if (buffer_tail_bits) {
+                merged_datum &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits);
+        }
+
+        /* Write the last datum to the buffer */
+
+        ACPI_MEMCPY(((char *)buffer) + buffer_offset, &merged_datum,
+                    ACPI_MIN(obj_desc->common_field.access_byte_width,
+                             buffer_length - buffer_offset));
+
+        return_ACPI_STATUS(AE_OK);
+}
+
+/*******************************************************************************
+ *
+ * FUNCTION:    acpi_ex_insert_into_field
+ *
+ * PARAMETERS:  obj_desc            - Field to be written
+ *              Buffer              - Data to be written
+ *              buffer_length       - Length of Buffer
+ *
+ * RETURN:      Status
+ *
+ * DESCRIPTION: Store the Buffer contents into the given field
+ *
+ ******************************************************************************/
+
+acpi_status
+acpi_ex_insert_into_field(union acpi_operand_object *obj_desc,
+                          void *buffer, u32 buffer_length)
+{
+        acpi_status status;
+        acpi_integer mask;
+        acpi_integer width_mask;
+        acpi_integer merged_datum;
+        acpi_integer raw_datum = 0;
+        u32 field_offset = 0;
+        u32 buffer_offset = 0;
+        u32 buffer_tail_bits;
+        u32 datum_count;
+        u32 field_datum_count;
+        u32 i;
+        u32 required_length;
+        void *new_buffer;
+
+        ACPI_FUNCTION_TRACE(ex_insert_into_field);
+
+        /* Validate input buffer */
+
+        new_buffer = NULL;
+        required_length =
+            ACPI_ROUND_BITS_UP_TO_BYTES(obj_desc->common_field.bit_length);
+        /*
+         * We must have a buffer that is at least as long as the field
+         * we are writing to.  This is because individual fields are
+         * indivisible and partial writes are not supported -- as per
+         * the ACPI specification.
+         */
+        if (buffer_length < required_length) {
+
+                /* We need to create a new buffer */
+
+                new_buffer = ACPI_ALLOCATE_ZEROED(required_length);
+                if (!new_buffer) {
+                        return_ACPI_STATUS(AE_NO_MEMORY);
+                }
+
+                /*
+                 * Copy the original data to the new buffer, starting
+                 * at Byte zero.  All unused (upper) bytes of the
+                 * buffer will be 0.
+                 */
+                ACPI_MEMCPY((char *)new_buffer, (char *)buffer, buffer_length);
+                buffer = new_buffer;
+                buffer_length = required_length;
+        }
+
+        /*
+         * Create the bitmasks used for bit insertion.
+         * Note: This if/else is used to bypass compiler differences with the
+         * shift operator
+         */
+        if (obj_desc->common_field.access_bit_width == ACPI_INTEGER_BIT_SIZE) {
+                width_mask = ACPI_INTEGER_MAX;
+        } else {
+                width_mask =
+                    ACPI_MASK_BITS_ABOVE(obj_desc->common_field.
+                                         access_bit_width);
+        }
+
+        mask = width_mask &
+            ACPI_MASK_BITS_BELOW(obj_desc->common_field.start_field_bit_offset);
+
+        /* Compute the number of datums (access width data items) */
+
+        datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length,
+                                       obj_desc->common_field.access_bit_width);
+
+        field_datum_count = ACPI_ROUND_UP_TO(obj_desc->common_field.bit_length +
+                                             obj_desc->common_field.
+                                             start_field_bit_offset,
+                                             obj_desc->common_field.
+                                             access_bit_width);
+
+        /* Get initial Datum from the input buffer */
+
+        ACPI_MEMCPY(&raw_datum, buffer,
+                    ACPI_MIN(obj_desc->common_field.access_byte_width,
+                             buffer_length - buffer_offset));
+
+        merged_datum =
+            raw_datum << obj_desc->common_field.start_field_bit_offset;
+
+        /* Write the entire field */
+
+        for (i = 1; i < field_datum_count; i++) {
+
+                /* Write merged datum to the target field */
+
+                merged_datum &= mask;
+                status = acpi_ex_write_with_update_rule(obj_desc, mask,
+                                                        merged_datum,
+                                                        field_offset);
+                if (ACPI_FAILURE(status)) {
+                        goto exit;
+                }
+
+                field_offset += obj_desc->common_field.access_byte_width;
+
+                /*
+                 * Start new output datum by merging with previous input datum
+                 * if necessary.
+                 *
+                 * Note: Before the shift, check if the shift value will be larger than
+                 * the integer size. If so, there is no need to perform the operation.
+                 * This avoids the differences in behavior between different compilers
+                 * concerning shift values larger than the target data width.
+                 */
+                if ((obj_desc->common_field.access_bit_width -
+                     obj_desc->common_field.start_field_bit_offset) <
+                    ACPI_INTEGER_BIT_SIZE) {
+                        merged_datum =
+                            raw_datum >> (obj_desc->common_field.
+                                          access_bit_width -
+                                          obj_desc->common_field.
+                                          start_field_bit_offset);
+                } else {
+                        merged_datum = 0;
+                }
+
+                mask = width_mask;
+
+                if (i == datum_count) {
+                        break;
+                }
+
+                /* Get the next input datum from the buffer */
+
+                buffer_offset += obj_desc->common_field.access_byte_width;
+                ACPI_MEMCPY(&raw_datum, ((char *)buffer) + buffer_offset,
+                            ACPI_MIN(obj_desc->common_field.access_byte_width,
+                                     buffer_length - buffer_offset));
+                merged_datum |=
+                    raw_datum << obj_desc->common_field.start_field_bit_offset;
+        }
+
+        /* Mask off any extra bits in the last datum */
+
+        buffer_tail_bits = (obj_desc->common_field.bit_length +
+                            obj_desc->common_field.start_field_bit_offset) %
+            obj_desc->common_field.access_bit_width;
+        if (buffer_tail_bits) {
+                mask &= ACPI_MASK_BITS_ABOVE(buffer_tail_bits);
+        }
+
+        /* Write the last datum to the field */
+
+        merged_datum &= mask;
+        status = acpi_ex_write_with_update_rule(obj_desc,
+                                                mask, merged_datum,
+                                                field_offset);
+
+      exit:
+        /* Free temporary buffer if we used one */
+
+        if (new_buffer) {
+                ACPI_FREE(new_buffer);
+        }
+        return_ACPI_STATUS(status);
+}