1da177e4c3
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!
836 lines
26 KiB
C
836 lines
26 KiB
C
/******************************************************************************
|
|
*
|
|
* 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);
|
|
}
|
|
|
|
|