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800ba7c5ea
ACPICA commit 8b9c69d0984067051ffbe8526f871448ead6a26b Link: https://github.com/acpica/acpica/commit/8b9c69d0 Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Erik Kaneda <erik.kaneda@intel.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
723 lines
22 KiB
C
723 lines
22 KiB
C
// SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0
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/******************************************************************************
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*
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* Module Name: tbfadt - FADT table utilities
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*
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* Copyright (C) 2000 - 2020, Intel Corp.
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*
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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, const 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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const 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, const 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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struct acpi_table_desc *fadt_desc;
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acpi_status status;
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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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fadt_desc = &acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index];
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status = acpi_tb_get_table(fadt_desc, &table);
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if (ACPI_FAILURE(status)) {
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return;
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}
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length = fadt_desc->length;
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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_tb_put_table(fadt_desc);
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/* Obtain the DSDT and FACS tables via their addresses within the FADT */
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acpi_tb_install_standard_table((acpi_physical_address)acpi_gbl_FADT.
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Xdsdt,
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ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
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FALSE, TRUE, &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_standard_table((acpi_physical_address)
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acpi_gbl_FADT.facs,
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ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
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FALSE, TRUE,
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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_standard_table((acpi_physical_address)
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acpi_gbl_FADT.Xfacs,
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ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL,
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FALSE, TRUE,
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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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* (typically the current ACPI specification version). If so, truncate
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* the table, and issue 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 %s length, "
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"truncating length %u to %u",
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table->revision, ACPI_FADT_CONFORMANCE,
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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 64-bit X field is originally
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* 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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const char *name;
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struct acpi_generic_address *address64;
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u32 address32;
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u8 length;
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u8 flags;
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u32 i;
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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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/*
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* Now we can update the local FADT length to the length of the
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* current FADT version as defined by the ACPI specification.
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* Thus, we will have a common FADT internally.
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*/
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acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
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/*
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* Expand the 32-bit DSDT addresses to 64-bit as necessary.
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* Later ACPICA code will always use the X 64-bit field.
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*/
|
|
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
|
|
*
|
|
* No override: if acpi_gbl_use32_bit_fadt_addresses is FALSE, and:
|
|
* 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 zero - Copy/use Address32
|
|
* Address32 non-zero == Address64 non-zero - Copy/use Address32
|
|
* 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) {
|
|
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));
|
|
}
|
|
|
|
/*
|
|
* 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 accommodate, 0xFF bits).
|
|
*/
|
|
if ((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));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Hardware register access code always uses the 64-bit fields.
|
|
* So if the 64-bit field is zero or is to be overridden,
|
|
* initialize it with the 32-bit fields.
|
|
* Note that when the 32-bit address favor is specified, the
|
|
* 64-bit fields are always re-initialized so that
|
|
* access_size/bit_width/bit_offset fields can be correctly
|
|
* configured to the values to trigger a 32-bit compatible
|
|
* access mode in the hardware register access code.
|
|
*/
|
|
if (!address64->address
|
|
|| acpi_gbl_use32_bit_fadt_addresses) {
|
|
acpi_tb_init_generic_address(address64,
|
|
ACPI_ADR_SPACE_SYSTEM_IO,
|
|
length,
|
|
(u64)address32,
|
|
name, flags);
|
|
}
|
|
}
|
|
|
|
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 valid %s but zero %s: "
|
|
"0x%8.8X%8.8X/0x%X", name,
|
|
(length ? "Length" :
|
|
"Address"),
|
|
(length ? "Address" :
|
|
"Length"),
|
|
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);
|
|
}
|
|
}
|
|
}
|