Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/acpi/executer/exfldio.c b/drivers/acpi/executer/exfldio.c
new file mode 100644
index 0000000..9d0f9d2
--- /dev/null
+++ b/drivers/acpi/executer/exfldio.c
@@ -0,0 +1,835 @@
+/******************************************************************************
+ *
+ * Module Name: exfldio - Aml Field I/O
+ *
+ *****************************************************************************/
+
+/*
+ * 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/acinterp.h>
+#include <acpi/amlcode.h>
+#include <acpi/acevents.h>
+#include <acpi/acdispat.h>
+
+
+#define _COMPONENT ACPI_EXECUTER
+ ACPI_MODULE_NAME ("exfldio")
+
+
+/*******************************************************************************
+ *
+ * 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.
+ *
+ ******************************************************************************/
+
+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_DEBUG_PRINT ((ACPI_DB_ERROR, "Needed Region, found type %X (%s)\n",
+ 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);
+ }
+ }
+
+ 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.
+ */
+ if (ACPI_ROUND_UP (rgn_desc->region.length,
+ obj_desc->common_field.access_byte_width) >=
+ (obj_desc->common_field.base_byte_offset +
+ (acpi_native_uint) 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_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Field [%4.4s] access width (%d bytes) too large for region [%4.4s] (length %X)\n",
+ 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_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Field [%4.4s] Base+Offset+Width %X+%X+%X is beyond end of region [%4.4s] (length %X)\n",
+ 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, byte_base %X, Offset %X at %8.8X%8.8X\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_FORMAT_UINT64 (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_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Region %s(%X) not implemented\n",
+ acpi_ut_get_region_name (rgn_desc->region.space_id),
+ rgn_desc->region.space_id));
+ }
+ else if (status == AE_NOT_EXIST) {
+ ACPI_REPORT_ERROR ((
+ "Region %s(%X) has no handler\n",
+ 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.
+ *
+ ******************************************************************************/
+
+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)
+ *
+ ******************************************************************************/
+
+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;
+ value = &local_value; /* To support reads without saving return 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 op_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);
+ }
+
+ ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
+ "I/O to Data Register: value_ptr %p\n",
+ value));
+
+ if (read_write == ACPI_READ) {
+ /* Read the datum from the data_register */
+
+ status = acpi_ex_extract_from_field (obj_desc->index_field.data_obj,
+ value, sizeof (acpi_integer));
+ }
+ else {
+ /* Write the datum to the data_register */
+
+ status = acpi_ex_insert_into_field (obj_desc->index_field.data_obj,
+ value, sizeof (acpi_integer));
+ }
+ break;
+
+
+ default:
+
+ ACPI_REPORT_ERROR (("Wrong object type in field I/O %X\n",
+ 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 set
+ * Value - Value to store
+ *
+ * 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,
+ ¤t_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_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "write_with_update_rule: Unknown update_rule setting: %X\n",
+ (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, datum_offset %X, Width %X, Value %8.8X%8.8X, merged_value %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_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Field size %X (bits) is too large for buffer (%X)\n",
+ 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 */
+
+ 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 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;
+
+
+ ACPI_FUNCTION_TRACE ("ex_insert_into_field");
+
+
+ /* Validate input buffer */
+
+ if (buffer_length < ACPI_ROUND_BITS_UP_TO_BYTES (
+ obj_desc->common_field.bit_length)) {
+ ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
+ "Field size %X (bits) is too large for buffer (%X)\n",
+ obj_desc->common_field.bit_length, buffer_length));
+
+ return_ACPI_STATUS (AE_BUFFER_OVERFLOW);
+ }
+
+ /* Compute the number of datums (access width data items) */
+
+ mask = ACPI_MASK_BITS_BELOW (obj_desc->common_field.start_field_bit_offset);
+ 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)) {
+ return_ACPI_STATUS (status);
+ }
+
+ /* Start new output datum by merging with previous input datum */
+
+ field_offset += obj_desc->common_field.access_byte_width;
+ merged_datum = raw_datum >>
+ (obj_desc->common_field.access_bit_width - obj_desc->common_field.start_field_bit_offset);
+ mask = ACPI_INTEGER_MAX;
+
+ 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);
+
+ return_ACPI_STATUS (status);
+}
+
+