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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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62fcce9104
Some logics actually relying on the existence of FADT, currently relies on the number of loaded tables. This false dependency can easily trigger regressions. One of them has been introduced by commit8ec3f45907(ACPICA: Tables: Fix global table list issues by removing fixed table). The commit changing the fixed table indexes results in the change of FADT table index, originally, it was 3 (thus the installed table count should be greater than 4), while currently it is 0 (and the installed table count may be 3). This patch fixes this regression by cleaning up the code. Lv Zheng. Link: https://bugzilla.kernel.org/show_bug.cgi?id=105351 Fixes:8ec3f45907(ACPICA: Tables: Fix global table list issues by removing fixed table) Reported-and-tested-by: Meelis Roos <mroos@linux.ee> Signed-off-by: Lv Zheng <lv.zheng@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
753 lines
23 KiB
C
753 lines
23 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 - 2015, 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,
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u64 address, char *register_name, u8 flags);
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static void acpi_tb_convert_fadt(void);
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static void acpi_tb_setup_fadt_registers(void);
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static u64
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acpi_tb_select_address(char *register_name, u32 address32, u64 address64);
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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 flags;
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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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#define ACPI_FADT_GPE_REGISTER 4
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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_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */
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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 | ACPI_FADT_GPE_REGISTER},
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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 | ACPI_FADT_GPE_REGISTER}
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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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* register_name - ASCII name of the ACPI 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,
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u64 address, char *register_name, u8 flags)
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{
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u8 bit_width;
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/*
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* Bit width field in the GAS is only one byte long, 255 max.
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* Check for bit_width overflow in GAS.
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*/
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bit_width = (u8)(byte_width * 8);
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if (byte_width > 31) { /* (31*8)=248, (32*8)=256 */
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/*
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* No error for GPE blocks, because we do not use the bit_width
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* for GPEs, the legacy length (byte_width) is used instead to
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* allow for a large number of GPEs.
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*/
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if (!(flags & ACPI_FADT_GPE_REGISTER)) {
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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,
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(byte_width * 8)));
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}
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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_select_address
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*
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* PARAMETERS: register_name - ASCII name of the ACPI register
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* address32 - 32-bit address of the register
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* address64 - 64-bit address of the register
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*
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* RETURN: The resolved 64-bit address
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*
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* DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within
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* the FADT. Used for the FACS and DSDT addresses.
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*
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* NOTES:
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*
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* Check for FACS and DSDT address mismatches. An address mismatch between
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* the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
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* DSDT/X_DSDT) could be a corrupted address field or it might indicate
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* the presence of two FACS or two DSDT tables.
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*
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* November 2013:
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* By default, as per the ACPICA specification, a valid 64-bit address is
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* used regardless of the value of the 32-bit address. However, this
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* behavior can be overridden via the acpi_gbl_use32_bit_fadt_addresses flag.
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*
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******************************************************************************/
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static u64
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acpi_tb_select_address(char *register_name, u32 address32, u64 address64)
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{
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if (!address64) {
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/* 64-bit address is zero, use 32-bit address */
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return ((u64)address32);
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}
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if (address32 && (address64 != (u64)address32)) {
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/* Address mismatch between 32-bit and 64-bit versions */
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ACPI_BIOS_WARNING((AE_INFO,
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"32/64X %s address mismatch in FADT: "
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"0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
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register_name, address32,
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ACPI_FORMAT_UINT64(address64),
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acpi_gbl_use32_bit_fadt_addresses ? 32 :
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64));
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/* 32-bit address override */
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if (acpi_gbl_use32_bit_fadt_addresses) {
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return ((u64)address32);
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}
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}
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/* Default is to use the 64-bit address */
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return (address64);
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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: None
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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(void)
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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[acpi_gbl_fadt_index].length;
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table =
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acpi_os_map_memory(acpi_gbl_root_table_list.
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tables[acpi_gbl_fadt_index].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_fixed_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
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ACPI_SIG_DSDT, &acpi_gbl_dsdt_index);
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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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if (acpi_gbl_FADT.facs) {
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acpi_tb_install_fixed_table((acpi_physical_address)
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acpi_gbl_FADT.facs,
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ACPI_SIG_FACS,
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&acpi_gbl_facs_index);
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}
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if (acpi_gbl_FADT.Xfacs) {
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acpi_tb_install_fixed_table((acpi_physical_address)
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acpi_gbl_FADT.Xfacs,
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ACPI_SIG_FACS,
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&acpi_gbl_xfacs_index);
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}
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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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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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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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/* 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 - acpi_gbl_FADT is used.
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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. Also validate
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* important fields within the FADT.
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*
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* NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must
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* contain a copy of the actual BIOS-provided 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 to the 64-bit X fields if the the 64-bit X field is
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* originally zero.
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*
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* For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address
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* fields are expanded to the corresponding 64-bit X fields in the internal
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* common 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, if the 64-bit field is originally
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* zero. Adhering to the ACPI specification, we completely ignore the 32-bit
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* field if the 64-bit field is valid, regardless of whether the host OS is
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* 32-bit or 64-bit.
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*
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* Possible additional checks:
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* (acpi_gbl_FADT.pm1_event_length >= 4)
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* (acpi_gbl_FADT.pm1_control_length >= 2)
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* (acpi_gbl_FADT.pm_timer_length >= 4)
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* Gpe block lengths must be multiple of 2
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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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char *name;
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struct acpi_generic_address *address64;
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u32 address32;
|
|
u8 length;
|
|
u8 flags;
|
|
u32 i;
|
|
|
|
/*
|
|
* For ACPI 1.0 FADTs (revision 1 or 2), ensure that reserved fields which
|
|
* should be zero are indeed zero. This will workaround BIOSs that
|
|
* inadvertently place values in these fields.
|
|
*
|
|
* The ACPI 1.0 reserved fields that will be zeroed are the bytes located
|
|
* at offset 45, 55, 95, and the word located at offset 109, 110.
|
|
*
|
|
* Note: The FADT revision value is unreliable. Only the length can be
|
|
* trusted.
|
|
*/
|
|
if (acpi_gbl_FADT.header.length <= ACPI_FADT_V2_SIZE) {
|
|
acpi_gbl_FADT.preferred_profile = 0;
|
|
acpi_gbl_FADT.pstate_control = 0;
|
|
acpi_gbl_FADT.cst_control = 0;
|
|
acpi_gbl_FADT.boot_flags = 0;
|
|
}
|
|
|
|
/*
|
|
* Now we can update the local FADT length to the length of the
|
|
* current FADT version as defined by the ACPI specification.
|
|
* Thus, we will have a common FADT internally.
|
|
*/
|
|
acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
|
|
|
|
/*
|
|
* Expand the 32-bit DSDT addresses to 64-bit as necessary.
|
|
* Later ACPICA code will always use the X 64-bit field.
|
|
*/
|
|
acpi_gbl_FADT.Xdsdt = acpi_tb_select_address("DSDT",
|
|
acpi_gbl_FADT.dsdt,
|
|
acpi_gbl_FADT.Xdsdt);
|
|
|
|
/* 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++) {
|
|
/*
|
|
* Get the 32-bit and 64-bit addresses, as well as the register
|
|
* length and register name.
|
|
*/
|
|
address32 = *ACPI_ADD_PTR(u32,
|
|
&acpi_gbl_FADT,
|
|
fadt_info_table[i].address32);
|
|
|
|
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;
|
|
flags = fadt_info_table[i].flags;
|
|
|
|
/*
|
|
* Expand the ACPI 1.0 32-bit addresses to the ACPI 2.0 64-bit "X"
|
|
* generic address structures as necessary. Later code will always use
|
|
* the 64-bit address structures.
|
|
*
|
|
* November 2013:
|
|
* Now always use the 64-bit address if it is valid (non-zero), in
|
|
* accordance with the ACPI specification which states that a 64-bit
|
|
* address supersedes the 32-bit version. This behavior can be
|
|
* overridden by the acpi_gbl_use32_bit_fadt_addresses flag.
|
|
*
|
|
* During 64-bit address construction and verification,
|
|
* these cases are handled:
|
|
*
|
|
* Address32 zero, Address64 [don't care] - Use Address64
|
|
*
|
|
* Address32 non-zero, Address64 zero - Copy/use Address32
|
|
* Address32 non-zero == Address64 non-zero - Use Address64
|
|
* Address32 non-zero != Address64 non-zero - Warning, use Address64
|
|
*
|
|
* Override: if acpi_gbl_use32_bit_fadt_addresses is TRUE, and:
|
|
* Address32 non-zero != Address64 non-zero - Warning, copy/use Address32
|
|
*
|
|
* Note: space_id is always I/O for 32-bit legacy address fields
|
|
*/
|
|
if (address32) {
|
|
if (!address64->address) {
|
|
|
|
/* 64-bit address is zero, use 32-bit address */
|
|
|
|
acpi_tb_init_generic_address(address64,
|
|
ACPI_ADR_SPACE_SYSTEM_IO,
|
|
*ACPI_ADD_PTR(u8,
|
|
&acpi_gbl_FADT,
|
|
fadt_info_table
|
|
[i].
|
|
length),
|
|
(u64)address32,
|
|
name, flags);
|
|
} else if (address64->address != (u64)address32) {
|
|
|
|
/* Address mismatch */
|
|
|
|
ACPI_BIOS_WARNING((AE_INFO,
|
|
"32/64X address mismatch in FADT/%s: "
|
|
"0x%8.8X/0x%8.8X%8.8X, using %u-bit address",
|
|
name, address32,
|
|
ACPI_FORMAT_UINT64
|
|
(address64->address),
|
|
acpi_gbl_use32_bit_fadt_addresses
|
|
? 32 : 64));
|
|
|
|
if (acpi_gbl_use32_bit_fadt_addresses) {
|
|
|
|
/* 32-bit address override */
|
|
|
|
acpi_tb_init_generic_address(address64,
|
|
ACPI_ADR_SPACE_SYSTEM_IO,
|
|
*ACPI_ADD_PTR
|
|
(u8,
|
|
&acpi_gbl_FADT,
|
|
fadt_info_table
|
|
[i].
|
|
length),
|
|
(u64)
|
|
address32,
|
|
name,
|
|
flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* 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].flags & ACPI_FADT_REQUIRED) {
|
|
/*
|
|
* Field is required (Pm1a_event, Pm1a_control).
|
|
* 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].flags & 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", 0);
|
|
}
|
|
}
|
|
}
|