Commit be030a57 authored by Bob Moore's avatar Bob Moore Committed by Len Brown
Browse files

ACPICA: Add support for complex _PLD buffers. 



_PLD (Physical Location of Device) returns a bit-packed buffer that
is difficult to parse. This change adds a new interface,
AcpiDecodePldBuffer that parses the buffer into a more usable
local struct. Also adds macros to both get and set individual
fields within the packed _PLD buffer. Adds a new include file,
acbuffer.h - which will be expanded to add structs for other
ACPI names that return buffers. ACPICA BZ 954.

Emit (in comments) the decoded contents of a static _PLD buffer
in order to improve comprehension of this bit-packed buffer.

Add multi-endian support to the _PLD decode routine. Deploy the
multi-endian macros to extract data from the _PLD buffer.

Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarFeng Tang <feng.tang@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent 4e2f9c27

drivers/acpi/acpica/aclocal.h

+13 −9
Original line number Diff line number Diff line
@@ -707,15 +707,18 @@ union acpi_parse_value { 
	u8                              disasm_opcode;  /* Subtype used for disassembly */\

	char                            aml_op_name[16])	/* Op name (debug only) */



#define ACPI_DASM_BUFFER                0x00

#define ACPI_DASM_RESOURCE              0x01

#define ACPI_DASM_STRING                0x02

#define ACPI_DASM_UNICODE               0x03

#define ACPI_DASM_EISAID                0x04

#define ACPI_DASM_MATCHOP               0x05

#define ACPI_DASM_LNOT_PREFIX           0x06

#define ACPI_DASM_LNOT_SUFFIX           0x07

#define ACPI_DASM_IGNORE                0x08

/* Flags for disasm_flags field above */



#define ACPI_DASM_BUFFER                0x00	/* Buffer is a simple data buffer */

#define ACPI_DASM_RESOURCE              0x01	/* Buffer is a Resource Descriptor */

#define ACPI_DASM_STRING                0x02	/* Buffer is a ASCII string */

#define ACPI_DASM_UNICODE               0x03	/* Buffer is a Unicode string */

#define ACPI_DASM_PLD_METHOD            0x04	/* Buffer is a _PLD method bit-packed buffer */

#define ACPI_DASM_EISAID                0x05	/* Integer is an EISAID */

#define ACPI_DASM_MATCHOP               0x06	/* Parent opcode is a Match() operator */

#define ACPI_DASM_LNOT_PREFIX           0x07	/* Start of a Lnot_equal (etc.) pair of opcodes */

#define ACPI_DASM_LNOT_SUFFIX           0x08	/* End  of a Lnot_equal (etc.) pair of opcodes */

#define ACPI_DASM_IGNORE                0x09	/* Not used at this time */



/*

 * Generic operation (for example:  If, While, Store)
@@ -1025,6 +1028,7 @@ struct acpi_port_info { 
 ****************************************************************************/



struct acpi_db_method_info {

	acpi_handle method;

	acpi_handle main_thread_gate;

	acpi_handle thread_complete_gate;

	acpi_thread_id *threads;

drivers/acpi/acpica/acmacros.h

+26 −3
Original line number Diff line number Diff line
@@ -277,10 +277,33 @@ 


/* Bitfields within ACPI registers */



#define ACPI_REGISTER_PREPARE_BITS(val, pos, mask)      ((val << pos) & mask)

#define ACPI_REGISTER_INSERT_VALUE(reg, pos, mask, val)  reg = (reg & (~(mask))) | ACPI_REGISTER_PREPARE_BITS(val, pos, mask)

#define ACPI_REGISTER_PREPARE_BITS(val, pos, mask) \

	((val << pos) & mask)



#define ACPI_INSERT_BITS(target, mask, source)          target = ((target & (~(mask))) | (source & mask))

#define ACPI_REGISTER_INSERT_VALUE(reg, pos, mask, val) \

	reg = (reg & (~(mask))) | ACPI_REGISTER_PREPARE_BITS(val, pos, mask)



#define ACPI_INSERT_BITS(target, mask, source) \

	target = ((target & (~(mask))) | (source & mask))



/* Generic bitfield macros and masks */



#define ACPI_GET_BITS(source_ptr, position, mask) \

	((*source_ptr >> position) & mask)



#define ACPI_SET_BITS(target_ptr, position, mask, value) \

	(*target_ptr |= ((value & mask) << position))



#define ACPI_1BIT_MASK      0x00000001

#define ACPI_2BIT_MASK      0x00000003

#define ACPI_3BIT_MASK      0x00000007

#define ACPI_4BIT_MASK      0x0000000F

#define ACPI_5BIT_MASK      0x0000001F

#define ACPI_6BIT_MASK      0x0000003F

#define ACPI_7BIT_MASK      0x0000007F

#define ACPI_8BIT_MASK      0x000000FF

#define ACPI_16BIT_MASK     0x0000FFFF

#define ACPI_24BIT_MASK     0x00FFFFFF



/*

 * An object of type struct acpi_namespace_node can appear in some contexts

drivers/acpi/acpica/utxface.c

+87 −0
Original line number Diff line number Diff line
@@ -418,3 +418,90 @@ acpi_check_address_range(acpi_adr_space_type space_id, 


ACPI_EXPORT_SYMBOL(acpi_check_address_range)

#endif				/* !ACPI_ASL_COMPILER */

/*******************************************************************************

 *

 * FUNCTION:    acpi_decode_pld_buffer

 *

 * PARAMETERS:  in_buffer           - Buffer returned by _PLD method

 *              length              - Length of the in_buffer

 *              return_buffer       - Where the decode buffer is returned

 *

 * RETURN:      Status and the decoded _PLD buffer. User must deallocate

 *              the buffer via ACPI_FREE.

 *

 * DESCRIPTION: Decode the bit-packed buffer returned by the _PLD method into

 *              a local struct that is much more useful to an ACPI driver.

 *

 ******************************************************************************/

acpi_status

acpi_decode_pld_buffer(u8 *in_buffer,

		       acpi_size length, struct acpi_pld_info ** return_buffer)

{

	struct acpi_pld_info *pld_info;

	u32 *buffer = ACPI_CAST_PTR(u32, in_buffer);

	u32 dword;



	/* Parameter validation */



	if (!in_buffer || !return_buffer || (length < 16)) {

		return (AE_BAD_PARAMETER);

	}



	pld_info = ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_pld_info));

	if (!pld_info) {

		return (AE_NO_MEMORY);

	}



	/* First 32-bit DWord */



	ACPI_MOVE_32_TO_32(&dword, &buffer[0]);

	pld_info->revision = ACPI_PLD_GET_REVISION(&dword);

	pld_info->ignore_color = ACPI_PLD_GET_IGNORE_COLOR(&dword);

	pld_info->color = ACPI_PLD_GET_COLOR(&dword);



	/* Second 32-bit DWord */



	ACPI_MOVE_32_TO_32(&dword, &buffer[1]);

	pld_info->width = ACPI_PLD_GET_WIDTH(&dword);

	pld_info->height = ACPI_PLD_GET_HEIGHT(&dword);



	/* Third 32-bit DWord */



	ACPI_MOVE_32_TO_32(&dword, &buffer[2]);

	pld_info->user_visible = ACPI_PLD_GET_USER_VISIBLE(&dword);

	pld_info->dock = ACPI_PLD_GET_DOCK(&dword);

	pld_info->lid = ACPI_PLD_GET_LID(&dword);

	pld_info->panel = ACPI_PLD_GET_PANEL(&dword);

	pld_info->vertical_position = ACPI_PLD_GET_VERTICAL(&dword);

	pld_info->horizontal_position = ACPI_PLD_GET_HORIZONTAL(&dword);

	pld_info->shape = ACPI_PLD_GET_SHAPE(&dword);

	pld_info->group_orientation = ACPI_PLD_GET_ORIENTATION(&dword);

	pld_info->group_token = ACPI_PLD_GET_TOKEN(&dword);

	pld_info->group_position = ACPI_PLD_GET_POSITION(&dword);

	pld_info->bay = ACPI_PLD_GET_BAY(&dword);



	/* Fourth 32-bit DWord */



	ACPI_MOVE_32_TO_32(&dword, &buffer[3]);

	pld_info->ejectable = ACPI_PLD_GET_EJECTABLE(&dword);

	pld_info->ospm_eject_required = ACPI_PLD_GET_OSPM_EJECT(&dword);

	pld_info->cabinet_number = ACPI_PLD_GET_CABINET(&dword);

	pld_info->card_cage_number = ACPI_PLD_GET_CARD_CAGE(&dword);

	pld_info->reference = ACPI_PLD_GET_REFERENCE(&dword);

	pld_info->rotation = ACPI_PLD_GET_ROTATION(&dword);

	pld_info->order = ACPI_PLD_GET_ORDER(&dword);



	if (length >= ACPI_PLD_BUFFER_SIZE) {



		/* Fifth 32-bit DWord (Revision 2 of _PLD) */



		ACPI_MOVE_32_TO_32(&dword, &buffer[4]);

		pld_info->vertical_offset = ACPI_PLD_GET_VERT_OFFSET(&dword);

		pld_info->horizontal_offset = ACPI_PLD_GET_HORIZ_OFFSET(&dword);

	}



	*return_buffer = pld_info;

	return (AE_OK);

}



ACPI_EXPORT_SYMBOL(acpi_decode_pld_buffer)

include/acpi/acbuffer.h

0 → 100644
+192 −0
Original line number Diff line number Diff line 
/******************************************************************************

 *

 * Name: acbuffer.h - Support for buffers returned by ACPI predefined names

 *

 *****************************************************************************/



/*

 * Copyright (C) 2000 - 2012, 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.

 */



#ifndef __ACBUFFER_H__

#define __ACBUFFER_H__



/*

 * Note: C bitfields are not used for this reason:

 *

 * "Bitfields are great and easy to read, but unfortunately the C language

 * does not specify the layout of bitfields in memory, which means they are

 * essentially useless for dealing with packed data in on-disk formats or

 * binary wire protocols." (Or ACPI tables and buffers.) "If you ask me,

 * this decision was a design error in C. Ritchie could have picked an order

 * and stuck with it." Norman Ramsey.

 * See http://stackoverflow.com/a/1053662/41661

 */



/*

 * Formatted _PLD return value. The minimum size is a package containing

 * one buffer.

 * Revision 1: Buffer is 16 bytes (128 bits)

 * Revision 2: Buffer is 20 bytes (160 bits)

 *

 * Note: This structure is returned from the acpi_decode_pld_buffer

 * interface.

 */

struct acpi_pld_info {

	u8 revision;

	u8 ignore_color;

	u32 color;

	u16 width;

	u16 height;

	u8 user_visible;

	u8 dock;

	u8 lid;

	u8 panel;

	u8 vertical_position;

	u8 horizontal_position;

	u8 shape;

	u8 group_orientation;

	u8 group_token;

	u8 group_position;

	u8 bay;

	u8 ejectable;

	u8 ospm_eject_required;

	u8 cabinet_number;

	u8 card_cage_number;

	u8 reference;

	u8 rotation;

	u8 order;

	u8 reserved;

	u16 vertical_offset;

	u16 horizontal_offset;

};



/*

 * Macros to:

 *     1) Convert a _PLD buffer to internal struct acpi_pld_info format - ACPI_PLD_GET*

 *        (Used by acpi_decode_pld_buffer)

 *     2) Construct a _PLD buffer - ACPI_PLD_SET*

 *        (Intended for BIOS use only)

 */

#define ACPI_PLD_REV1_BUFFER_SIZE               16	/* For Revision 1 of the buffer (From ACPI spec) */

#define ACPI_PLD_BUFFER_SIZE                    20	/* For Revision 2 of the buffer (From ACPI spec) */



/* First 32-bit dword, bits 0:32 */



#define ACPI_PLD_GET_REVISION(dword)            ACPI_GET_BITS (dword, 0, ACPI_7BIT_MASK)

#define ACPI_PLD_SET_REVISION(dword,value)      ACPI_SET_BITS (dword, 0, ACPI_7BIT_MASK, value)	/* Offset 0, Len 7 */



#define ACPI_PLD_GET_IGNORE_COLOR(dword)        ACPI_GET_BITS (dword, 7, ACPI_1BIT_MASK)

#define ACPI_PLD_SET_IGNORE_COLOR(dword,value)  ACPI_SET_BITS (dword, 7, ACPI_1BIT_MASK, value)	/* Offset 7, Len 1 */



#define ACPI_PLD_GET_COLOR(dword)               ACPI_GET_BITS (dword, 8, ACPI_24BIT_MASK)

#define ACPI_PLD_SET_COLOR(dword,value)         ACPI_SET_BITS (dword, 8, ACPI_24BIT_MASK, value)	/* Offset 8, Len 24 */



/* Second 32-bit dword, bits 33:63 */



#define ACPI_PLD_GET_WIDTH(dword)               ACPI_GET_BITS (dword, 0, ACPI_16BIT_MASK)

#define ACPI_PLD_SET_WIDTH(dword,value)         ACPI_SET_BITS (dword, 0, ACPI_16BIT_MASK, value)	/* Offset 32+0=32, Len 16 */



#define ACPI_PLD_GET_HEIGHT(dword)              ACPI_GET_BITS (dword, 16, ACPI_16BIT_MASK)

#define ACPI_PLD_SET_HEIGHT(dword,value)        ACPI_SET_BITS (dword, 16, ACPI_16BIT_MASK, value)	/* Offset 32+16=48, Len 16 */



/* Third 32-bit dword, bits 64:95 */



#define ACPI_PLD_GET_USER_VISIBLE(dword)        ACPI_GET_BITS (dword, 0, ACPI_1BIT_MASK)

#define ACPI_PLD_SET_USER_VISIBLE(dword,value)  ACPI_SET_BITS (dword, 0, ACPI_1BIT_MASK, value)	/* Offset 64+0=64, Len 1 */



#define ACPI_PLD_GET_DOCK(dword)                ACPI_GET_BITS (dword, 1, ACPI_1BIT_MASK)

#define ACPI_PLD_SET_DOCK(dword,value)          ACPI_SET_BITS (dword, 1, ACPI_1BIT_MASK, value)	/* Offset 64+1=65, Len 1 */



#define ACPI_PLD_GET_LID(dword)                 ACPI_GET_BITS (dword, 2, ACPI_1BIT_MASK)

#define ACPI_PLD_SET_LID(dword,value)           ACPI_SET_BITS (dword, 2, ACPI_1BIT_MASK, value)	/* Offset 64+2=66, Len 1 */



#define ACPI_PLD_GET_PANEL(dword)               ACPI_GET_BITS (dword, 3, ACPI_3BIT_MASK)

#define ACPI_PLD_SET_PANEL(dword,value)         ACPI_SET_BITS (dword, 3, ACPI_3BIT_MASK, value)	/* Offset 64+3=67, Len 3 */



#define ACPI_PLD_GET_VERTICAL(dword)            ACPI_GET_BITS (dword, 6, ACPI_2BIT_MASK)

#define ACPI_PLD_SET_VERTICAL(dword,value)      ACPI_SET_BITS (dword, 6, ACPI_2BIT_MASK, value)	/* Offset 64+6=70, Len 2 */



#define ACPI_PLD_GET_HORIZONTAL(dword)          ACPI_GET_BITS (dword, 8, ACPI_2BIT_MASK)

#define ACPI_PLD_SET_HORIZONTAL(dword,value)    ACPI_SET_BITS (dword, 8, ACPI_2BIT_MASK, value)	/* Offset 64+8=72, Len 2 */



#define ACPI_PLD_GET_SHAPE(dword)               ACPI_GET_BITS (dword, 10, ACPI_4BIT_MASK)

#define ACPI_PLD_SET_SHAPE(dword,value)         ACPI_SET_BITS (dword, 10, ACPI_4BIT_MASK, value)	/* Offset 64+10=74, Len 4 */



#define ACPI_PLD_GET_ORIENTATION(dword)         ACPI_GET_BITS (dword, 14, ACPI_1BIT_MASK)

#define ACPI_PLD_SET_ORIENTATION(dword,value)   ACPI_SET_BITS (dword, 14, ACPI_1BIT_MASK, value)	/* Offset 64+14=78, Len 1 */



#define ACPI_PLD_GET_TOKEN(dword)               ACPI_GET_BITS (dword, 15, ACPI_8BIT_MASK)

#define ACPI_PLD_SET_TOKEN(dword,value)         ACPI_SET_BITS (dword, 15, ACPI_8BIT_MASK, value)	/* Offset 64+15=79, Len 8 */



#define ACPI_PLD_GET_POSITION(dword)            ACPI_GET_BITS (dword, 23, ACPI_8BIT_MASK)

#define ACPI_PLD_SET_POSITION(dword,value)      ACPI_SET_BITS (dword, 23, ACPI_8BIT_MASK, value)	/* Offset 64+23=87, Len 8 */



#define ACPI_PLD_GET_BAY(dword)                 ACPI_GET_BITS (dword, 31, ACPI_1BIT_MASK)

#define ACPI_PLD_SET_BAY(dword,value)           ACPI_SET_BITS (dword, 31, ACPI_1BIT_MASK, value)	/* Offset 64+31=95, Len 1 */



/* Fourth 32-bit dword, bits 96:127 */



#define ACPI_PLD_GET_EJECTABLE(dword)           ACPI_GET_BITS (dword, 0, ACPI_1BIT_MASK)

#define ACPI_PLD_SET_EJECTABLE(dword,value)     ACPI_SET_BITS (dword, 0, ACPI_1BIT_MASK, value)	/* Offset 96+0=96, Len 1 */



#define ACPI_PLD_GET_OSPM_EJECT(dword)          ACPI_GET_BITS (dword, 1, ACPI_1BIT_MASK)

#define ACPI_PLD_SET_OSPM_EJECT(dword,value)    ACPI_SET_BITS (dword, 1, ACPI_1BIT_MASK, value)	/* Offset 96+1=97, Len 1 */



#define ACPI_PLD_GET_CABINET(dword)             ACPI_GET_BITS (dword, 2, ACPI_8BIT_MASK)

#define ACPI_PLD_SET_CABINET(dword,value)       ACPI_SET_BITS (dword, 2, ACPI_8BIT_MASK, value)	/* Offset 96+2=98, Len 8 */



#define ACPI_PLD_GET_CARD_CAGE(dword)           ACPI_GET_BITS (dword, 10, ACPI_8BIT_MASK)

#define ACPI_PLD_SET_CARD_CAGE(dword,value)     ACPI_SET_BITS (dword, 10, ACPI_8BIT_MASK, value)	/* Offset 96+10=106, Len 8 */



#define ACPI_PLD_GET_REFERENCE(dword)           ACPI_GET_BITS (dword, 18, ACPI_1BIT_MASK)

#define ACPI_PLD_SET_REFERENCE(dword,value)     ACPI_SET_BITS (dword, 18, ACPI_1BIT_MASK, value)	/* Offset 96+18=114, Len 1 */



#define ACPI_PLD_GET_ROTATION(dword)            ACPI_GET_BITS (dword, 19, ACPI_4BIT_MASK)

#define ACPI_PLD_SET_ROTATION(dword,value)      ACPI_SET_BITS (dword, 19, ACPI_4BIT_MASK, value)	/* Offset 96+19=115, Len 4 */



#define ACPI_PLD_GET_ORDER(dword)               ACPI_GET_BITS (dword, 23, ACPI_5BIT_MASK)

#define ACPI_PLD_SET_ORDER(dword,value)         ACPI_SET_BITS (dword, 23, ACPI_5BIT_MASK, value)	/* Offset 96+23=119, Len 5 */



/* Fifth 32-bit dword, bits 128:159 (Revision 2 of _PLD only) */



#define ACPI_PLD_GET_VERT_OFFSET(dword)         ACPI_GET_BITS (dword, 0, ACPI_16BIT_MASK)

#define ACPI_PLD_SET_VERT_OFFSET(dword,value)   ACPI_SET_BITS (dword, 0, ACPI_16BIT_MASK, value)	/* Offset 128+0=128, Len 16 */



#define ACPI_PLD_GET_HORIZ_OFFSET(dword)        ACPI_GET_BITS (dword, 16, ACPI_16BIT_MASK)

#define ACPI_PLD_SET_HORIZ_OFFSET(dword,value)  ACPI_SET_BITS (dword, 16, ACPI_16BIT_MASK, value)	/* Offset 128+16=144, Len 16 */



#endif				/* ACBUFFER_H */

include/acpi/acnames.h

+1 −0
Original line number Diff line number Diff line
@@ -63,6 +63,7 @@ 
#define METHOD_NAME__PRW        "_PRW"

#define METHOD_NAME__SRS        "_SRS"

#define METHOD_NAME__CBA        "_CBA"

#define METHOD_NAME__PLD        "_PLD"



/* Method names - these methods must appear at the namespace root */

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