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722 lines
22 KiB
722 lines
22 KiB
// 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 - 2021, 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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/* |
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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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*/ |
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acpi_gbl_FADT.Xdsdt = acpi_tb_select_address("DSDT", |
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acpi_gbl_FADT.dsdt, |
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acpi_gbl_FADT.Xdsdt); |
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|
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/* If Hardware Reduced flag is set, we are all done */ |
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if (acpi_gbl_reduced_hardware) { |
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return; |
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} |
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/* Examine all of the 64-bit extended address fields (X fields) */ |
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for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) { |
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/* |
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* Get the 32-bit and 64-bit addresses, as well as the register |
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* length and register name. |
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*/ |
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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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length = *ACPI_ADD_PTR(u8, |
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&acpi_gbl_FADT, |
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fadt_info_table[i].length); |
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name = fadt_info_table[i].name; |
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flags = fadt_info_table[i].flags; |
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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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* November 2013: |
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* Now always use the 64-bit address if it is valid (non-zero), in |
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* accordance with the ACPI specification which states that a 64-bit |
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* address supersedes the 32-bit version. This behavior can be |
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* overridden by the acpi_gbl_use32_bit_fadt_addresses flag. |
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* |
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* During 64-bit address construction and verification, |
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* these cases are handled: |
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* |
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* Address32 zero, Address64 [don't care] - Use Address64 |
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* |
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* No override: if acpi_gbl_use32_bit_fadt_addresses is FALSE, and: |
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* Address32 non-zero, Address64 zero - Copy/use Address32 |
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* Address32 non-zero == Address64 non-zero - Use Address64 |
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* Address32 non-zero != Address64 non-zero - Warning, use Address64 |
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* |
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* Override: if acpi_gbl_use32_bit_fadt_addresses is TRUE, and: |
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* Address32 non-zero, Address64 zero - Copy/use Address32 |
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* Address32 non-zero == Address64 non-zero - Copy/use Address32 |
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* 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); |
|
} |
|
} |
|
}
|
|
|