702 lines
22 KiB
C
702 lines
22 KiB
C
/******************************************************************************
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*
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* Module Name: tbfadt - FADT table utilities
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2013, Intel Corp.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#include "accommon.h"
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#include "actables.h"
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#define _COMPONENT ACPI_TABLES
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ACPI_MODULE_NAME("tbfadt")
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/* Local prototypes */
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static void
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acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
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u8 space_id,
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u8 byte_width, u64 address, char *register_name);
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static void acpi_tb_convert_fadt(void);
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static void acpi_tb_validate_fadt(void);
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static void acpi_tb_setup_fadt_registers(void);
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/* Table for conversion of FADT to common internal format and FADT validation */
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typedef struct acpi_fadt_info {
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char *name;
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u16 address64;
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u16 address32;
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u16 length;
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u8 default_length;
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u8 type;
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} acpi_fadt_info;
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#define ACPI_FADT_OPTIONAL 0
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#define ACPI_FADT_REQUIRED 1
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#define ACPI_FADT_SEPARATE_LENGTH 2
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static struct acpi_fadt_info fadt_info_table[] = {
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{"Pm1aEventBlock",
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ACPI_FADT_OFFSET(xpm1a_event_block),
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ACPI_FADT_OFFSET(pm1a_event_block),
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ACPI_FADT_OFFSET(pm1_event_length),
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ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
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ACPI_FADT_REQUIRED},
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{"Pm1bEventBlock",
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ACPI_FADT_OFFSET(xpm1b_event_block),
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ACPI_FADT_OFFSET(pm1b_event_block),
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ACPI_FADT_OFFSET(pm1_event_length),
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ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */
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ACPI_FADT_OPTIONAL},
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{"Pm1aControlBlock",
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ACPI_FADT_OFFSET(xpm1a_control_block),
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ACPI_FADT_OFFSET(pm1a_control_block),
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ACPI_FADT_OFFSET(pm1_control_length),
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ACPI_PM1_REGISTER_WIDTH,
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ACPI_FADT_REQUIRED},
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{"Pm1bControlBlock",
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ACPI_FADT_OFFSET(xpm1b_control_block),
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ACPI_FADT_OFFSET(pm1b_control_block),
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ACPI_FADT_OFFSET(pm1_control_length),
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ACPI_PM1_REGISTER_WIDTH,
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ACPI_FADT_OPTIONAL},
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{"Pm2ControlBlock",
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ACPI_FADT_OFFSET(xpm2_control_block),
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ACPI_FADT_OFFSET(pm2_control_block),
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ACPI_FADT_OFFSET(pm2_control_length),
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ACPI_PM2_REGISTER_WIDTH,
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ACPI_FADT_SEPARATE_LENGTH},
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{"PmTimerBlock",
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ACPI_FADT_OFFSET(xpm_timer_block),
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ACPI_FADT_OFFSET(pm_timer_block),
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ACPI_FADT_OFFSET(pm_timer_length),
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ACPI_PM_TIMER_WIDTH,
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ACPI_FADT_REQUIRED},
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{"Gpe0Block",
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ACPI_FADT_OFFSET(xgpe0_block),
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ACPI_FADT_OFFSET(gpe0_block),
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ACPI_FADT_OFFSET(gpe0_block_length),
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0,
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ACPI_FADT_SEPARATE_LENGTH},
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{"Gpe1Block",
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ACPI_FADT_OFFSET(xgpe1_block),
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ACPI_FADT_OFFSET(gpe1_block),
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ACPI_FADT_OFFSET(gpe1_block_length),
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0,
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ACPI_FADT_SEPARATE_LENGTH}
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};
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#define ACPI_FADT_INFO_ENTRIES \
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(sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info))
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/* Table used to split Event Blocks into separate status/enable registers */
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typedef struct acpi_fadt_pm_info {
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struct acpi_generic_address *target;
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u16 source;
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u8 register_num;
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} acpi_fadt_pm_info;
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static struct acpi_fadt_pm_info fadt_pm_info_table[] = {
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{&acpi_gbl_xpm1a_status,
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ACPI_FADT_OFFSET(xpm1a_event_block),
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0},
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{&acpi_gbl_xpm1a_enable,
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ACPI_FADT_OFFSET(xpm1a_event_block),
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1},
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{&acpi_gbl_xpm1b_status,
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ACPI_FADT_OFFSET(xpm1b_event_block),
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0},
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{&acpi_gbl_xpm1b_enable,
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ACPI_FADT_OFFSET(xpm1b_event_block),
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1}
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};
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#define ACPI_FADT_PM_INFO_ENTRIES \
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(sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info))
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_init_generic_address
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*
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* PARAMETERS: generic_address - GAS struct to be initialized
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* space_id - ACPI Space ID for this register
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* byte_width - Width of this register
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* address - Address of the register
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*
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* RETURN: None
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*
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* DESCRIPTION: Initialize a Generic Address Structure (GAS)
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* See the ACPI specification for a full description and
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* definition of this structure.
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*
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******************************************************************************/
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static void
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acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
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u8 space_id,
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u8 byte_width, u64 address, char *register_name)
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{
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u8 bit_width;
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/* Bit width field in the GAS is only one byte long, 255 max */
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bit_width = (u8)(byte_width * 8);
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if (byte_width > 31) { /* (31*8)=248 */
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ACPI_ERROR((AE_INFO,
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"%s - 32-bit FADT register is too long (%u bytes, %u bits) "
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"to convert to GAS struct - 255 bits max, truncating",
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register_name, byte_width, (byte_width * 8)));
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bit_width = 255;
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}
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/*
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* The 64-bit Address field is non-aligned in the byte packed
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* GAS struct.
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*/
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ACPI_MOVE_64_TO_64(&generic_address->address, &address);
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/* All other fields are byte-wide */
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generic_address->space_id = space_id;
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generic_address->bit_width = bit_width;
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generic_address->bit_offset = 0;
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generic_address->access_width = 0; /* Access width ANY */
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_parse_fadt
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*
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* PARAMETERS: table_index - Index for the FADT
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*
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* RETURN: None
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*
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* DESCRIPTION: Initialize the FADT, DSDT and FACS tables
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* (FADT contains the addresses of the DSDT and FACS)
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*
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******************************************************************************/
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void acpi_tb_parse_fadt(u32 table_index)
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{
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u32 length;
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struct acpi_table_header *table;
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/*
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* The FADT has multiple versions with different lengths,
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* and it contains pointers to both the DSDT and FACS tables.
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*
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* Get a local copy of the FADT and convert it to a common format
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* Map entire FADT, assumed to be smaller than one page.
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*/
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length = acpi_gbl_root_table_list.tables[table_index].length;
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table =
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acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_index].
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address, length);
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if (!table) {
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return;
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}
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/*
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* Validate the FADT checksum before we copy the table. Ignore
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* checksum error as we want to try to get the DSDT and FACS.
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*/
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(void)acpi_tb_verify_checksum(table, length);
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/* Create a local copy of the FADT in common ACPI 2.0+ format */
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acpi_tb_create_local_fadt(table, length);
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/* All done with the real FADT, unmap it */
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acpi_os_unmap_memory(table, length);
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/* Obtain the DSDT and FACS tables via their addresses within the FADT */
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acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
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ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
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/* If Hardware Reduced flag is set, there is no FACS */
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if (!acpi_gbl_reduced_hardware) {
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acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.
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Xfacs, ACPI_SIG_FACS,
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ACPI_TABLE_INDEX_FACS);
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}
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_create_local_fadt
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*
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* PARAMETERS: table - Pointer to BIOS FADT
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* length - Length of the table
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*
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* RETURN: None
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*
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* DESCRIPTION: Get a local copy of the FADT and convert it to a common format.
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* Performs validation on some important FADT fields.
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*
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* NOTE: We create a local copy of the FADT regardless of the version.
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*
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******************************************************************************/
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void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length)
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{
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/*
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* Check if the FADT is larger than the largest table that we expect
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* (the ACPI 5.0 version). If so, truncate the table, and issue
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* a warning.
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*/
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if (length > sizeof(struct acpi_table_fadt)) {
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ACPI_BIOS_WARNING((AE_INFO,
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"FADT (revision %u) is longer than ACPI 5.0 version, "
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"truncating length %u to %u",
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table->revision, length,
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(u32)sizeof(struct acpi_table_fadt)));
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}
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/* Clear the entire local FADT */
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ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
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/* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
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ACPI_MEMCPY(&acpi_gbl_FADT, table,
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ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
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/* Take a copy of the Hardware Reduced flag */
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acpi_gbl_reduced_hardware = FALSE;
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if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) {
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acpi_gbl_reduced_hardware = TRUE;
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}
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/* Convert the local copy of the FADT to the common internal format */
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acpi_tb_convert_fadt();
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/* Validate FADT values now, before we make any changes */
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acpi_tb_validate_fadt();
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/* Initialize the global ACPI register structures */
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acpi_tb_setup_fadt_registers();
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}
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/*******************************************************************************
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*
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* FUNCTION: acpi_tb_convert_fadt
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*
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* PARAMETERS: None, uses acpi_gbl_FADT
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*
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* RETURN: None
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*
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* DESCRIPTION: Converts all versions of the FADT to a common internal format.
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* Expand 32-bit addresses to 64-bit as necessary.
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*
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* NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt),
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* and must contain a copy of the actual FADT.
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*
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* Notes on 64-bit register addresses:
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*
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* After this FADT conversion, later ACPICA code will only use the 64-bit "X"
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* fields of the FADT for all ACPI register addresses.
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*
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* The 64-bit "X" fields are optional extensions to the original 32-bit FADT
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* V1.0 fields. Even if they are present in the FADT, they are optional and
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* are unused if the BIOS sets them to zero. Therefore, we must copy/expand
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* 32-bit V1.0 fields if the corresponding X field is zero.
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*
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* For ACPI 1.0 FADTs, all 32-bit address fields are expanded to the
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* corresponding "X" fields in the internal FADT.
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*
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* For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
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* to the corresponding 64-bit X fields. For compatibility with other ACPI
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* implementations, we ignore the 64-bit field if the 32-bit field is valid,
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* regardless of whether the host OS is 32-bit or 64-bit.
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*
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******************************************************************************/
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static void acpi_tb_convert_fadt(void)
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{
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struct acpi_generic_address *address64;
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u32 address32;
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u32 i;
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/*
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* Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
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* Later code will always use the X 64-bit field. Also, check for an
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* address mismatch between the 32-bit and 64-bit address fields
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* (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate
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* the presence of two FACS or two DSDT tables.
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*/
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if (!acpi_gbl_FADT.Xfacs) {
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acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
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} else if (acpi_gbl_FADT.facs &&
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(acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
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ACPI_WARNING((AE_INFO,
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"32/64 FACS address mismatch in FADT - two FACS tables!"));
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}
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if (!acpi_gbl_FADT.Xdsdt) {
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acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
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} else if (acpi_gbl_FADT.dsdt &&
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(acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
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ACPI_WARNING((AE_INFO,
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"32/64 DSDT address mismatch in FADT - two DSDT tables!"));
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}
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/*
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* For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
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* should be zero are indeed zero. This will workaround BIOSs that
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* inadvertently place values in these fields.
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*
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* The ACPI 1.0 reserved fields that will be zeroed are the bytes located
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* at offset 45, 55, 95, and the word located at offset 109, 110.
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*
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* Note: The FADT revision value is unreliable. Only the length can be
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* trusted.
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*/
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if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
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acpi_gbl_FADT.preferred_profile = 0;
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acpi_gbl_FADT.pstate_control = 0;
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acpi_gbl_FADT.cst_control = 0;
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acpi_gbl_FADT.boot_flags = 0;
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}
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/* Update the local FADT table header length */
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acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
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/*
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* Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
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* generic address structures as necessary. Later code will always use
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* the 64-bit address structures.
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*
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* March 2009:
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* We now always use the 32-bit address if it is valid (non-null). This
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* is not in accordance with the ACPI specification which states that
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* the 64-bit address supersedes the 32-bit version, but we do this for
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* compatibility with other ACPI implementations. Most notably, in the
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* case where both the 32 and 64 versions are non-null, we use the 32-bit
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* version. This is the only address that is guaranteed to have been
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* tested by the BIOS manufacturer.
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*/
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for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
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address32 = *ACPI_ADD_PTR(u32,
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&acpi_gbl_FADT,
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fadt_info_table[i].address32);
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address64 = ACPI_ADD_PTR(struct acpi_generic_address,
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&acpi_gbl_FADT,
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fadt_info_table[i].address64);
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/*
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* If both 32- and 64-bit addresses are valid (non-zero),
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* they must match.
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*/
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if (address64->address && address32 &&
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(address64->address != (u64)address32)) {
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ACPI_BIOS_ERROR((AE_INFO,
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"32/64X address mismatch in FADT/%s: "
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"0x%8.8X/0x%8.8X%8.8X, using 32",
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fadt_info_table[i].name, address32,
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ACPI_FORMAT_UINT64(address64->
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address)));
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}
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/* Always use 32-bit address if it is valid (non-null) */
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if (address32) {
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/*
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* Copy the 32-bit address to the 64-bit GAS structure. The
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* Space ID is always I/O for 32-bit legacy address fields
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*/
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acpi_tb_init_generic_address(address64,
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ACPI_ADR_SPACE_SYSTEM_IO,
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*ACPI_ADD_PTR(u8,
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&acpi_gbl_FADT,
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fadt_info_table
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[i].length),
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(u64) address32,
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|
fadt_info_table[i].name);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_tb_validate_fadt
|
|
*
|
|
* PARAMETERS: table - Pointer to the FADT to be validated
|
|
*
|
|
* RETURN: None
|
|
*
|
|
* DESCRIPTION: Validate various important fields within the FADT. If a problem
|
|
* is found, issue a message, but no status is returned.
|
|
* Used by both the table manager and the disassembler.
|
|
*
|
|
* Possible additional checks:
|
|
* (acpi_gbl_FADT.pm1_event_length >= 4)
|
|
* (acpi_gbl_FADT.pm1_control_length >= 2)
|
|
* (acpi_gbl_FADT.pm_timer_length >= 4)
|
|
* Gpe block lengths must be multiple of 2
|
|
*
|
|
******************************************************************************/
|
|
|
|
static void acpi_tb_validate_fadt(void)
|
|
{
|
|
char *name;
|
|
struct acpi_generic_address *address64;
|
|
u8 length;
|
|
u32 i;
|
|
|
|
/*
|
|
* Check for FACS and DSDT address mismatches. An address mismatch between
|
|
* the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
|
|
* DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
|
|
*/
|
|
if (acpi_gbl_FADT.facs &&
|
|
(acpi_gbl_FADT.Xfacs != (u64)acpi_gbl_FADT.facs)) {
|
|
ACPI_BIOS_WARNING((AE_INFO,
|
|
"32/64X FACS address mismatch in FADT - "
|
|
"0x%8.8X/0x%8.8X%8.8X, using 32",
|
|
acpi_gbl_FADT.facs,
|
|
ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs)));
|
|
|
|
acpi_gbl_FADT.Xfacs = (u64)acpi_gbl_FADT.facs;
|
|
}
|
|
|
|
if (acpi_gbl_FADT.dsdt &&
|
|
(acpi_gbl_FADT.Xdsdt != (u64)acpi_gbl_FADT.dsdt)) {
|
|
ACPI_BIOS_WARNING((AE_INFO,
|
|
"32/64X DSDT address mismatch in FADT - "
|
|
"0x%8.8X/0x%8.8X%8.8X, using 32",
|
|
acpi_gbl_FADT.dsdt,
|
|
ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt)));
|
|
|
|
acpi_gbl_FADT.Xdsdt = (u64)acpi_gbl_FADT.dsdt;
|
|
}
|
|
|
|
/* If Hardware Reduced flag is set, we are all done */
|
|
|
|
if (acpi_gbl_reduced_hardware) {
|
|
return;
|
|
}
|
|
|
|
/* Examine all of the 64-bit extended address fields (X fields) */
|
|
|
|
for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
|
|
/*
|
|
* Generate pointer to the 64-bit address, get the register
|
|
* length (width) and the register name
|
|
*/
|
|
address64 = ACPI_ADD_PTR(struct acpi_generic_address,
|
|
&acpi_gbl_FADT,
|
|
fadt_info_table[i].address64);
|
|
length =
|
|
*ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
|
|
fadt_info_table[i].length);
|
|
name = fadt_info_table[i].name;
|
|
|
|
/*
|
|
* For each extended field, check for length mismatch between the
|
|
* legacy length field and the corresponding 64-bit X length field.
|
|
* Note: If the legacy length field is > 0xFF bits, ignore this
|
|
* check. (GPE registers can be larger than the 64-bit GAS structure
|
|
* can accomodate, 0xFF bits).
|
|
*/
|
|
if (address64->address &&
|
|
(ACPI_MUL_8(length) <= ACPI_UINT8_MAX) &&
|
|
(address64->bit_width != ACPI_MUL_8(length))) {
|
|
ACPI_BIOS_WARNING((AE_INFO,
|
|
"32/64X length mismatch in FADT/%s: %u/%u",
|
|
name, ACPI_MUL_8(length),
|
|
address64->bit_width));
|
|
}
|
|
|
|
if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
|
|
/*
|
|
* Field is required (Pm1a_event, Pm1a_control, pm_timer).
|
|
* Both the address and length must be non-zero.
|
|
*/
|
|
if (!address64->address || !length) {
|
|
ACPI_BIOS_ERROR((AE_INFO,
|
|
"Required FADT field %s has zero address and/or length: "
|
|
"0x%8.8X%8.8X/0x%X",
|
|
name,
|
|
ACPI_FORMAT_UINT64(address64->
|
|
address),
|
|
length));
|
|
}
|
|
} else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
|
|
/*
|
|
* Field is optional (Pm2_control, GPE0, GPE1) AND has its own
|
|
* length field. If present, both the address and length must
|
|
* be valid.
|
|
*/
|
|
if ((address64->address && !length) ||
|
|
(!address64->address && length)) {
|
|
ACPI_BIOS_WARNING((AE_INFO,
|
|
"Optional FADT field %s has zero address or length: "
|
|
"0x%8.8X%8.8X/0x%X",
|
|
name,
|
|
ACPI_FORMAT_UINT64
|
|
(address64->address),
|
|
length));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/*******************************************************************************
|
|
*
|
|
* FUNCTION: acpi_tb_setup_fadt_registers
|
|
*
|
|
* PARAMETERS: None, uses acpi_gbl_FADT.
|
|
*
|
|
* RETURN: None
|
|
*
|
|
* DESCRIPTION: Initialize global ACPI PM1 register definitions. Optionally,
|
|
* force FADT register definitions to their default lengths.
|
|
*
|
|
******************************************************************************/
|
|
|
|
static void acpi_tb_setup_fadt_registers(void)
|
|
{
|
|
struct acpi_generic_address *target64;
|
|
struct acpi_generic_address *source64;
|
|
u8 pm1_register_byte_width;
|
|
u32 i;
|
|
|
|
/*
|
|
* Optionally check all register lengths against the default values and
|
|
* update them if they are incorrect.
|
|
*/
|
|
if (acpi_gbl_use_default_register_widths) {
|
|
for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
|
|
target64 =
|
|
ACPI_ADD_PTR(struct acpi_generic_address,
|
|
&acpi_gbl_FADT,
|
|
fadt_info_table[i].address64);
|
|
|
|
/*
|
|
* If a valid register (Address != 0) and the (default_length > 0)
|
|
* (Not a GPE register), then check the width against the default.
|
|
*/
|
|
if ((target64->address) &&
|
|
(fadt_info_table[i].default_length > 0) &&
|
|
(fadt_info_table[i].default_length !=
|
|
target64->bit_width)) {
|
|
ACPI_BIOS_WARNING((AE_INFO,
|
|
"Invalid length for FADT/%s: %u, using default %u",
|
|
fadt_info_table[i].name,
|
|
target64->bit_width,
|
|
fadt_info_table[i].
|
|
default_length));
|
|
|
|
/* Incorrect size, set width to the default */
|
|
|
|
target64->bit_width =
|
|
fadt_info_table[i].default_length;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Get the length of the individual PM1 registers (enable and status).
|
|
* Each register is defined to be (event block length / 2). Extra divide
|
|
* by 8 converts bits to bytes.
|
|
*/
|
|
pm1_register_byte_width = (u8)
|
|
ACPI_DIV_16(acpi_gbl_FADT.xpm1a_event_block.bit_width);
|
|
|
|
/*
|
|
* Calculate separate GAS structs for the PM1x (A/B) Status and Enable
|
|
* registers. These addresses do not appear (directly) in the FADT, so it
|
|
* is useful to pre-calculate them from the PM1 Event Block definitions.
|
|
*
|
|
* The PM event blocks are split into two register blocks, first is the
|
|
* PM Status Register block, followed immediately by the PM Enable
|
|
* Register block. Each is of length (pm1_event_length/2)
|
|
*
|
|
* Note: The PM1A event block is required by the ACPI specification.
|
|
* However, the PM1B event block is optional and is rarely, if ever,
|
|
* used.
|
|
*/
|
|
|
|
for (i = 0; i < ACPI_FADT_PM_INFO_ENTRIES; i++) {
|
|
source64 =
|
|
ACPI_ADD_PTR(struct acpi_generic_address, &acpi_gbl_FADT,
|
|
fadt_pm_info_table[i].source);
|
|
|
|
if (source64->address) {
|
|
acpi_tb_init_generic_address(fadt_pm_info_table[i].
|
|
target, source64->space_id,
|
|
pm1_register_byte_width,
|
|
source64->address +
|
|
(fadt_pm_info_table[i].
|
|
register_num *
|
|
pm1_register_byte_width),
|
|
"PmRegisters");
|
|
}
|
|
}
|
|
}
|