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linux/drivers/acpi/executer/exprep.c
Robert Moore 44f6c01242 ACPICA 20050408 from Bob Moore 
Fixed three cases in the interpreter where an "index"
argument to an ASL function was still (internally) 32
bits instead of the required 64 bits.  This was the Index
argument to the Index, Mid, and Match operators.

The "strupr" function is now permanently local
(acpi_ut_strupr), since this is not a POSIX-defined
function and not present in most kernel-level C
libraries. References to the C library strupr function
have been removed from the headers.

Completed the deployment of static
functions/prototypes. All prototypes with the static
attribute have been moved from the headers to the owning
C file.

ACPICA 20050329 from Bob Moore

An error is now generated if an attempt is made to create
a Buffer Field of length zero (A CreateField with a length
operand of zero.)

The interpreter now issues a warning whenever executable
code at the module level is detected during ACPI table
load. This will give some idea of the prevalence of this
type of code.

Implemented support for references to named objects (other
than control methods) within package objects.

Enhanced package object output for the debug
object. Package objects are now completely dumped, showing
all elements.

Enhanced miscellaneous object output for the debug
object. Any object can now be written to the debug object
(for example, a device object can be written, and the type
of the object will be displayed.)

The "static" qualifier has been added to all local
functions across the core subsystem.

The number of "long" lines (> 80 chars) within the source
has been significantly reduced, by about 1/3.

Cleaned up all header files to ensure that all CA/iASL
functions are prototyped (even static functions) and the
formatting is consistent.

Two new header files have been added, acopcode.h and
acnames.h.

Removed several obsolete functions that were no longer
used.

Signed-off-by: Len Brown <len.brown@intel.com>
2005-07-12 00:08:52 -04:00

565 lines
18 KiB
C
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/******************************************************************************
*
* Module Name: exprep - ACPI AML (p-code) execution - field prep utilities
*
*****************************************************************************/
/*
* 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/acnamesp.h>
#define _COMPONENT ACPI_EXECUTER
ACPI_MODULE_NAME ("exprep")
/* Local prototypes */
static u32
acpi_ex_decode_field_access (
union acpi_operand_object *obj_desc,
u8 field_flags,
u32 *return_byte_alignment);
#ifdef ACPI_UNDER_DEVELOPMENT
static u32
acpi_ex_generate_access (
u32 field_bit_offset,
u32 field_bit_length,
u32 region_length);
/*******************************************************************************
*
* FUNCTION: acpi_ex_generate_access
*
* PARAMETERS: field_bit_offset - Start of field within parent region/buffer
* field_bit_length - Length of field in bits
* region_length - Length of parent in bytes
*
* RETURN: Field granularity (8, 16, 32 or 64) and
* byte_alignment (1, 2, 3, or 4)
*
* DESCRIPTION: Generate an optimal access width for fields defined with the
* any_acc keyword.
*
* NOTE: Need to have the region_length in order to check for boundary
* conditions (end-of-region). However, the region_length is a deferred
* operation. Therefore, to complete this implementation, the generation
* of this access width must be deferred until the region length has
* been evaluated.
*
******************************************************************************/
static u32
acpi_ex_generate_access (
u32 field_bit_offset,
u32 field_bit_length,
u32 region_length)
{
u32 field_byte_length;
u32 field_byte_offset;
u32 field_byte_end_offset;
u32 access_byte_width;
u32 field_start_offset;
u32 field_end_offset;
u32 minimum_access_width = 0xFFFFFFFF;
u32 minimum_accesses = 0xFFFFFFFF;
u32 accesses;
ACPI_FUNCTION_TRACE ("ex_generate_access");
/* Round Field start offset and length to "minimal" byte boundaries */
field_byte_offset = ACPI_DIV_8 (ACPI_ROUND_DOWN (field_bit_offset, 8));
field_byte_end_offset = ACPI_DIV_8 (ACPI_ROUND_UP (field_bit_length +
field_bit_offset, 8));
field_byte_length = field_byte_end_offset - field_byte_offset;
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Bit length %d, Bit offset %d\n",
field_bit_length, field_bit_offset));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Byte Length %d, Byte Offset %d, End Offset %d\n",
field_byte_length, field_byte_offset, field_byte_end_offset));
/*
* Iterative search for the maximum access width that is both aligned
* and does not go beyond the end of the region
*
* Start at byte_acc and work upwards to qword_acc max. (1,2,4,8 bytes)
*/
for (access_byte_width = 1; access_byte_width <= 8; access_byte_width <<= 1) {
/*
* 1) Round end offset up to next access boundary and make sure that
* this does not go beyond the end of the parent region.
* 2) When the Access width is greater than the field_byte_length, we
* are done. (This does not optimize for the perfectly aligned
* case yet).
*/
if (ACPI_ROUND_UP (field_byte_end_offset, access_byte_width) <= region_length) {
field_start_offset =
ACPI_ROUND_DOWN (field_byte_offset, access_byte_width) /
access_byte_width;
field_end_offset =
ACPI_ROUND_UP ((field_byte_length + field_byte_offset),
access_byte_width) / access_byte_width;
accesses = field_end_offset - field_start_offset;
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"access_width %d end is within region\n", access_byte_width));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Field Start %d, Field End %d -- requires %d accesses\n",
field_start_offset, field_end_offset, accesses));
/* Single access is optimal */
if (accesses <= 1) {
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Entire field can be accessed with one operation of size %d\n",
access_byte_width));
return_VALUE (access_byte_width);
}
/*
* Fits in the region, but requires more than one read/write.
* try the next wider access on next iteration
*/
if (accesses < minimum_accesses) {
minimum_accesses = accesses;
minimum_access_width = access_byte_width;
}
}
else {
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"access_width %d end is NOT within region\n", access_byte_width));
if (access_byte_width == 1) {
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Field goes beyond end-of-region!\n"));
/* Field does not fit in the region at all */
return_VALUE (0);
}
/*
* This width goes beyond the end-of-region, back off to
* previous access
*/
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Backing off to previous optimal access width of %d\n",
minimum_access_width));
return_VALUE (minimum_access_width);
}
}
/*
* Could not read/write field with one operation,
* just use max access width
*/
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Cannot access field in one operation, using width 8\n"));
return_VALUE (8);
}
#endif /* ACPI_UNDER_DEVELOPMENT */
/*******************************************************************************
*
* FUNCTION: acpi_ex_decode_field_access
*
* PARAMETERS: obj_desc - Field object
* field_flags - Encoded fieldflags (contains access bits)
* return_byte_alignment - Where the byte alignment is returned
*
* RETURN: Field granularity (8, 16, 32 or 64) and
* byte_alignment (1, 2, 3, or 4)
*
* DESCRIPTION: Decode the access_type bits of a field definition.
*
******************************************************************************/
static u32
acpi_ex_decode_field_access (
union acpi_operand_object *obj_desc,
u8 field_flags,
u32 *return_byte_alignment)
{
u32 access;
u32 byte_alignment;
u32 bit_length;
ACPI_FUNCTION_TRACE ("ex_decode_field_access");
access = (field_flags & AML_FIELD_ACCESS_TYPE_MASK);
switch (access) {
case AML_FIELD_ACCESS_ANY:
#ifdef ACPI_UNDER_DEVELOPMENT
byte_alignment =
acpi_ex_generate_access (obj_desc->common_field.start_field_bit_offset,
obj_desc->common_field.bit_length,
0xFFFFFFFF /* Temp until we pass region_length as parameter */);
bit_length = byte_alignment * 8;
#endif
byte_alignment = 1;
bit_length = 8;
break;
case AML_FIELD_ACCESS_BYTE:
case AML_FIELD_ACCESS_BUFFER: /* ACPI 2.0 (SMBus Buffer) */
byte_alignment = 1;
bit_length = 8;
break;
case AML_FIELD_ACCESS_WORD:
byte_alignment = 2;
bit_length = 16;
break;
case AML_FIELD_ACCESS_DWORD:
byte_alignment = 4;
bit_length = 32;
break;
case AML_FIELD_ACCESS_QWORD: /* ACPI 2.0 */
byte_alignment = 8;
bit_length = 64;
break;
default:
/* Invalid field access type */
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Unknown field access type %X\n",
access));
return_VALUE (0);
}
if (ACPI_GET_OBJECT_TYPE (obj_desc) == ACPI_TYPE_BUFFER_FIELD) {
/*
* buffer_field access can be on any byte boundary, so the
* byte_alignment is always 1 byte -- regardless of any byte_alignment
* implied by the field access type.
*/
byte_alignment = 1;
}
*return_byte_alignment = byte_alignment;
return_VALUE (bit_length);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_prep_common_field_object
*
* PARAMETERS: obj_desc - The field object
* field_flags - Access, lock_rule, and update_rule.
* The format of a field_flag is described
* in the ACPI specification
* field_attribute - Special attributes (not used)
* field_bit_position - Field start position
* field_bit_length - Field length in number of bits
*
* RETURN: Status
*
* DESCRIPTION: Initialize the areas of the field object that are common
* to the various types of fields. Note: This is very "sensitive"
* code because we are solving the general case for field
* alignment.
*
******************************************************************************/
acpi_status
acpi_ex_prep_common_field_object (
union acpi_operand_object *obj_desc,
u8 field_flags,
u8 field_attribute,
u32 field_bit_position,
u32 field_bit_length)
{
u32 access_bit_width;
u32 byte_alignment;
u32 nearest_byte_address;
ACPI_FUNCTION_TRACE ("ex_prep_common_field_object");
/*
* Note: the structure being initialized is the
* ACPI_COMMON_FIELD_INFO; No structure fields outside of the common
* area are initialized by this procedure.
*/
obj_desc->common_field.field_flags = field_flags;
obj_desc->common_field.attribute = field_attribute;
obj_desc->common_field.bit_length = field_bit_length;
/*
* Decode the access type so we can compute offsets. The access type gives
* two pieces of information - the width of each field access and the
* necessary byte_alignment (address granularity) of the access.
*
* For any_acc, the access_bit_width is the largest width that is both
* necessary and possible in an attempt to access the whole field in one
* I/O operation. However, for any_acc, the byte_alignment is always one
* byte.
*
* For all Buffer Fields, the byte_alignment is always one byte.
*
* For all other access types (Byte, Word, Dword, Qword), the Bitwidth is
* the same (equivalent) as the byte_alignment.
*/
access_bit_width = acpi_ex_decode_field_access (obj_desc, field_flags,
&byte_alignment);
if (!access_bit_width) {
return_ACPI_STATUS (AE_AML_OPERAND_VALUE);
}
/* Setup width (access granularity) fields */
obj_desc->common_field.access_byte_width = (u8)
ACPI_DIV_8 (access_bit_width); /* 1, 2, 4, 8 */
obj_desc->common_field.access_bit_width = (u8) access_bit_width;
/*
* base_byte_offset is the address of the start of the field within the
* region. It is the byte address of the first *datum* (field-width data
* unit) of the field. (i.e., the first datum that contains at least the
* first *bit* of the field.)
*
* Note: byte_alignment is always either equal to the access_bit_width or 8
* (Byte access), and it defines the addressing granularity of the parent
* region or buffer.
*/
nearest_byte_address =
ACPI_ROUND_BITS_DOWN_TO_BYTES (field_bit_position);
obj_desc->common_field.base_byte_offset = (u32)
ACPI_ROUND_DOWN (nearest_byte_address, byte_alignment);
/*
* start_field_bit_offset is the offset of the first bit of the field within
* a field datum.
*/
obj_desc->common_field.start_field_bit_offset = (u8)
(field_bit_position - ACPI_MUL_8 (obj_desc->common_field.base_byte_offset));
/*
* Does the entire field fit within a single field access element? (datum)
* (i.e., without crossing a datum boundary)
*/
if ((obj_desc->common_field.start_field_bit_offset + field_bit_length) <=
(u16) access_bit_width) {
obj_desc->common.flags |= AOPOBJ_SINGLE_DATUM;
}
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ex_prep_field_value
*
* PARAMETERS: Info - Contains all field creation info
*
* RETURN: Status
*
* DESCRIPTION: Construct an union acpi_operand_object of type def_field and
* connect it to the parent Node.
*
******************************************************************************/
acpi_status
acpi_ex_prep_field_value (
struct acpi_create_field_info *info)
{
union acpi_operand_object *obj_desc;
u32 type;
acpi_status status;
ACPI_FUNCTION_TRACE ("ex_prep_field_value");
/* Parameter validation */
if (info->field_type != ACPI_TYPE_LOCAL_INDEX_FIELD) {
if (!info->region_node) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "Null region_node\n"));
return_ACPI_STATUS (AE_AML_NO_OPERAND);
}
type = acpi_ns_get_type (info->region_node);
if (type != ACPI_TYPE_REGION) {
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR,
"Needed Region, found type %X (%s)\n",
type, acpi_ut_get_type_name (type)));
return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
}
}
/* Allocate a new field object */
obj_desc = acpi_ut_create_internal_object (info->field_type);
if (!obj_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Initialize areas of the object that are common to all fields */
obj_desc->common_field.node = info->field_node;
status = acpi_ex_prep_common_field_object (obj_desc, info->field_flags,
info->attribute, info->field_bit_position, info->field_bit_length);
if (ACPI_FAILURE (status)) {
acpi_ut_delete_object_desc (obj_desc);
return_ACPI_STATUS (status);
}
/* Initialize areas of the object that are specific to the field type */
switch (info->field_type) {
case ACPI_TYPE_LOCAL_REGION_FIELD:
obj_desc->field.region_obj = acpi_ns_get_attached_object (info->region_node);
/* An additional reference for the container */
acpi_ut_add_reference (obj_desc->field.region_obj);
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"region_field: bit_off %X, Off %X, Gran %X, Region %p\n",
obj_desc->field.start_field_bit_offset, obj_desc->field.base_byte_offset,
obj_desc->field.access_byte_width, obj_desc->field.region_obj));
break;
case ACPI_TYPE_LOCAL_BANK_FIELD:
obj_desc->bank_field.value = info->bank_value;
obj_desc->bank_field.region_obj = acpi_ns_get_attached_object (
info->region_node);
obj_desc->bank_field.bank_obj = acpi_ns_get_attached_object (
info->register_node);
/* An additional reference for the attached objects */
acpi_ut_add_reference (obj_desc->bank_field.region_obj);
acpi_ut_add_reference (obj_desc->bank_field.bank_obj);
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"Bank Field: bit_off %X, Off %X, Gran %X, Region %p, bank_reg %p\n",
obj_desc->bank_field.start_field_bit_offset,
obj_desc->bank_field.base_byte_offset,
obj_desc->field.access_byte_width,
obj_desc->bank_field.region_obj,
obj_desc->bank_field.bank_obj));
break;
case ACPI_TYPE_LOCAL_INDEX_FIELD:
obj_desc->index_field.index_obj = acpi_ns_get_attached_object (
info->register_node);
obj_desc->index_field.data_obj = acpi_ns_get_attached_object (
info->data_register_node);
obj_desc->index_field.value = (u32)
(info->field_bit_position / ACPI_MUL_8 (
obj_desc->field.access_byte_width));
if (!obj_desc->index_field.data_obj || !obj_desc->index_field.index_obj) {
ACPI_REPORT_ERROR (("Null Index Object during field prep\n"));
acpi_ut_delete_object_desc (obj_desc);
return_ACPI_STATUS (AE_AML_INTERNAL);
}
/* An additional reference for the attached objects */
acpi_ut_add_reference (obj_desc->index_field.data_obj);
acpi_ut_add_reference (obj_desc->index_field.index_obj);
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD,
"index_field: bit_off %X, Off %X, Value %X, Gran %X, Index %p, Data %p\n",
obj_desc->index_field.start_field_bit_offset,
obj_desc->index_field.base_byte_offset,
obj_desc->index_field.value,
obj_desc->field.access_byte_width,
obj_desc->index_field.index_obj,
obj_desc->index_field.data_obj));
break;
default:
/* No other types should get here */
break;
}
/*
* Store the constructed descriptor (obj_desc) into the parent Node,
* preserving the current type of that named_obj.
*/
status = acpi_ns_attach_object (info->field_node, obj_desc,
acpi_ns_get_type (info->field_node));
ACPI_DEBUG_PRINT ((ACPI_DB_BFIELD, "Set named_obj %p [%4.4s], obj_desc %p\n",
info->field_node, acpi_ut_get_node_name (info->field_node), obj_desc));
/* Remove local reference to the object */
acpi_ut_remove_reference (obj_desc);
return_ACPI_STATUS (status);
}
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