0,0 → 1,752 |
/****************************************************************************** |
* |
* Module Name: tbfadt - FADT table utilities |
* |
*****************************************************************************/ |
|
/* |
* Copyright (C) 2000 - 2015, Intel Corp. |
* All rights reserved. |
* |
* Redistribution and use in source and binary forms, with or without |
* modification, are permitted provided that the following conditions |
* are met: |
* 1. Redistributions of source code must retain the above copyright |
* notice, this list of conditions, and the following disclaimer, |
* without modification. |
* 2. Redistributions in binary form must reproduce at minimum a disclaimer |
* substantially similar to the "NO WARRANTY" disclaimer below |
* ("Disclaimer") and any redistribution must be conditioned upon |
* including a substantially similar Disclaimer requirement for further |
* binary redistribution. |
* 3. Neither the names of the above-listed copyright holders nor the names |
* of any contributors may be used to endorse or promote products derived |
* from this software without specific prior written permission. |
* |
* Alternatively, this software may be distributed under the terms of the |
* GNU General Public License ("GPL") version 2 as published by the Free |
* Software Foundation. |
* |
* NO WARRANTY |
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR |
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING |
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
* POSSIBILITY OF SUCH DAMAGES. |
*/ |
|
#include <acpi/acpi.h> |
#include "accommon.h" |
#include "actables.h" |
|
#define _COMPONENT ACPI_TABLES |
ACPI_MODULE_NAME("tbfadt") |
|
/* Local prototypes */ |
static void |
acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, |
u8 space_id, |
u8 byte_width, |
u64 address, char *register_name, u8 flags); |
|
static void acpi_tb_convert_fadt(void); |
|
static void acpi_tb_setup_fadt_registers(void); |
|
static u64 |
acpi_tb_select_address(char *register_name, u32 address32, u64 address64); |
|
/* Table for conversion of FADT to common internal format and FADT validation */ |
|
typedef struct acpi_fadt_info { |
char *name; |
u16 address64; |
u16 address32; |
u16 length; |
u8 default_length; |
u8 flags; |
|
} acpi_fadt_info; |
|
#define ACPI_FADT_OPTIONAL 0 |
#define ACPI_FADT_REQUIRED 1 |
#define ACPI_FADT_SEPARATE_LENGTH 2 |
#define ACPI_FADT_GPE_REGISTER 4 |
|
static struct acpi_fadt_info fadt_info_table[] = { |
{"Pm1aEventBlock", |
ACPI_FADT_OFFSET(xpm1a_event_block), |
ACPI_FADT_OFFSET(pm1a_event_block), |
ACPI_FADT_OFFSET(pm1_event_length), |
ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ |
ACPI_FADT_REQUIRED}, |
|
{"Pm1bEventBlock", |
ACPI_FADT_OFFSET(xpm1b_event_block), |
ACPI_FADT_OFFSET(pm1b_event_block), |
ACPI_FADT_OFFSET(pm1_event_length), |
ACPI_PM1_REGISTER_WIDTH * 2, /* Enable + Status register */ |
ACPI_FADT_OPTIONAL}, |
|
{"Pm1aControlBlock", |
ACPI_FADT_OFFSET(xpm1a_control_block), |
ACPI_FADT_OFFSET(pm1a_control_block), |
ACPI_FADT_OFFSET(pm1_control_length), |
ACPI_PM1_REGISTER_WIDTH, |
ACPI_FADT_REQUIRED}, |
|
{"Pm1bControlBlock", |
ACPI_FADT_OFFSET(xpm1b_control_block), |
ACPI_FADT_OFFSET(pm1b_control_block), |
ACPI_FADT_OFFSET(pm1_control_length), |
ACPI_PM1_REGISTER_WIDTH, |
ACPI_FADT_OPTIONAL}, |
|
{"Pm2ControlBlock", |
ACPI_FADT_OFFSET(xpm2_control_block), |
ACPI_FADT_OFFSET(pm2_control_block), |
ACPI_FADT_OFFSET(pm2_control_length), |
ACPI_PM2_REGISTER_WIDTH, |
ACPI_FADT_SEPARATE_LENGTH}, |
|
{"PmTimerBlock", |
ACPI_FADT_OFFSET(xpm_timer_block), |
ACPI_FADT_OFFSET(pm_timer_block), |
ACPI_FADT_OFFSET(pm_timer_length), |
ACPI_PM_TIMER_WIDTH, |
ACPI_FADT_SEPARATE_LENGTH}, /* ACPI 5.0A: Timer is optional */ |
|
{"Gpe0Block", |
ACPI_FADT_OFFSET(xgpe0_block), |
ACPI_FADT_OFFSET(gpe0_block), |
ACPI_FADT_OFFSET(gpe0_block_length), |
0, |
ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER}, |
|
{"Gpe1Block", |
ACPI_FADT_OFFSET(xgpe1_block), |
ACPI_FADT_OFFSET(gpe1_block), |
ACPI_FADT_OFFSET(gpe1_block_length), |
0, |
ACPI_FADT_SEPARATE_LENGTH | ACPI_FADT_GPE_REGISTER} |
}; |
|
#define ACPI_FADT_INFO_ENTRIES \ |
(sizeof (fadt_info_table) / sizeof (struct acpi_fadt_info)) |
|
/* Table used to split Event Blocks into separate status/enable registers */ |
|
typedef struct acpi_fadt_pm_info { |
struct acpi_generic_address *target; |
u16 source; |
u8 register_num; |
|
} acpi_fadt_pm_info; |
|
static struct acpi_fadt_pm_info fadt_pm_info_table[] = { |
{&acpi_gbl_xpm1a_status, |
ACPI_FADT_OFFSET(xpm1a_event_block), |
0}, |
|
{&acpi_gbl_xpm1a_enable, |
ACPI_FADT_OFFSET(xpm1a_event_block), |
1}, |
|
{&acpi_gbl_xpm1b_status, |
ACPI_FADT_OFFSET(xpm1b_event_block), |
0}, |
|
{&acpi_gbl_xpm1b_enable, |
ACPI_FADT_OFFSET(xpm1b_event_block), |
1} |
}; |
|
#define ACPI_FADT_PM_INFO_ENTRIES \ |
(sizeof (fadt_pm_info_table) / sizeof (struct acpi_fadt_pm_info)) |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_init_generic_address |
* |
* PARAMETERS: generic_address - GAS struct to be initialized |
* space_id - ACPI Space ID for this register |
* byte_width - Width of this register |
* address - Address of the register |
* register_name - ASCII name of the ACPI register |
* |
* RETURN: None |
* |
* DESCRIPTION: Initialize a Generic Address Structure (GAS) |
* See the ACPI specification for a full description and |
* definition of this structure. |
* |
******************************************************************************/ |
|
static void |
acpi_tb_init_generic_address(struct acpi_generic_address *generic_address, |
u8 space_id, |
u8 byte_width, |
u64 address, char *register_name, u8 flags) |
{ |
u8 bit_width; |
|
/* |
* Bit width field in the GAS is only one byte long, 255 max. |
* Check for bit_width overflow in GAS. |
*/ |
bit_width = (u8)(byte_width * 8); |
if (byte_width > 31) { /* (31*8)=248, (32*8)=256 */ |
/* |
* No error for GPE blocks, because we do not use the bit_width |
* for GPEs, the legacy length (byte_width) is used instead to |
* allow for a large number of GPEs. |
*/ |
if (!(flags & ACPI_FADT_GPE_REGISTER)) { |
ACPI_ERROR((AE_INFO, |
"%s - 32-bit FADT register is too long (%u bytes, %u bits) " |
"to convert to GAS struct - 255 bits max, truncating", |
register_name, byte_width, |
(byte_width * 8))); |
} |
|
bit_width = 255; |
} |
|
/* |
* The 64-bit Address field is non-aligned in the byte packed |
* GAS struct. |
*/ |
ACPI_MOVE_64_TO_64(&generic_address->address, &address); |
|
/* All other fields are byte-wide */ |
|
generic_address->space_id = space_id; |
generic_address->bit_width = bit_width; |
generic_address->bit_offset = 0; |
generic_address->access_width = 0; /* Access width ANY */ |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_select_address |
* |
* PARAMETERS: register_name - ASCII name of the ACPI register |
* address32 - 32-bit address of the register |
* address64 - 64-bit address of the register |
* |
* RETURN: The resolved 64-bit address |
* |
* DESCRIPTION: Select between 32-bit and 64-bit versions of addresses within |
* the FADT. Used for the FACS and DSDT addresses. |
* |
* NOTES: |
* |
* Check for FACS and DSDT address mismatches. An address mismatch between |
* the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and |
* DSDT/X_DSDT) could be a corrupted address field or it might indicate |
* the presence of two FACS or two DSDT tables. |
* |
* November 2013: |
* By default, as per the ACPICA specification, a valid 64-bit address is |
* used regardless of the value of the 32-bit address. However, this |
* behavior can be overridden via the acpi_gbl_use32_bit_fadt_addresses flag. |
* |
******************************************************************************/ |
|
static u64 |
acpi_tb_select_address(char *register_name, u32 address32, u64 address64) |
{ |
|
if (!address64) { |
|
/* 64-bit address is zero, use 32-bit address */ |
|
return ((u64)address32); |
} |
|
if (address32 && (address64 != (u64)address32)) { |
|
/* Address mismatch between 32-bit and 64-bit versions */ |
|
ACPI_BIOS_WARNING((AE_INFO, |
"32/64X %s address mismatch in FADT: " |
"0x%8.8X/0x%8.8X%8.8X, using %u-bit address", |
register_name, address32, |
ACPI_FORMAT_UINT64(address64), |
acpi_gbl_use32_bit_fadt_addresses ? 32 : |
64)); |
|
/* 32-bit address override */ |
|
if (acpi_gbl_use32_bit_fadt_addresses) { |
return ((u64)address32); |
} |
} |
|
/* Default is to use the 64-bit address */ |
|
return (address64); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_parse_fadt |
* |
* PARAMETERS: None |
* |
* RETURN: None |
* |
* DESCRIPTION: Initialize the FADT, DSDT and FACS tables |
* (FADT contains the addresses of the DSDT and FACS) |
* |
******************************************************************************/ |
|
void acpi_tb_parse_fadt(void) |
{ |
u32 length; |
struct acpi_table_header *table; |
|
/* |
* The FADT has multiple versions with different lengths, |
* and it contains pointers to both the DSDT and FACS tables. |
* |
* Get a local copy of the FADT and convert it to a common format |
* Map entire FADT, assumed to be smaller than one page. |
*/ |
length = acpi_gbl_root_table_list.tables[acpi_gbl_fadt_index].length; |
|
table = |
acpi_os_map_memory(acpi_gbl_root_table_list. |
tables[acpi_gbl_fadt_index].address, length); |
if (!table) { |
return; |
} |
|
/* |
* Validate the FADT checksum before we copy the table. Ignore |
* checksum error as we want to try to get the DSDT and FACS. |
*/ |
(void)acpi_tb_verify_checksum(table, length); |
|
/* Create a local copy of the FADT in common ACPI 2.0+ format */ |
|
acpi_tb_create_local_fadt(table, length); |
|
/* All done with the real FADT, unmap it */ |
|
acpi_os_unmap_memory(table, length); |
|
/* Obtain the DSDT and FACS tables via their addresses within the FADT */ |
|
acpi_tb_install_fixed_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt, |
ACPI_SIG_DSDT, &acpi_gbl_dsdt_index); |
|
/* If Hardware Reduced flag is set, there is no FACS */ |
|
if (!acpi_gbl_reduced_hardware) { |
if (acpi_gbl_FADT.facs) { |
acpi_tb_install_fixed_table((acpi_physical_address) |
acpi_gbl_FADT.facs, |
ACPI_SIG_FACS, |
&acpi_gbl_facs_index); |
} |
if (acpi_gbl_FADT.Xfacs) { |
acpi_tb_install_fixed_table((acpi_physical_address) |
acpi_gbl_FADT.Xfacs, |
ACPI_SIG_FACS, |
&acpi_gbl_xfacs_index); |
} |
} |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_create_local_fadt |
* |
* PARAMETERS: table - Pointer to BIOS FADT |
* length - Length of the table |
* |
* RETURN: None |
* |
* DESCRIPTION: Get a local copy of the FADT and convert it to a common format. |
* Performs validation on some important FADT fields. |
* |
* NOTE: We create a local copy of the FADT regardless of the version. |
* |
******************************************************************************/ |
|
void acpi_tb_create_local_fadt(struct acpi_table_header *table, u32 length) |
{ |
/* |
* Check if the FADT is larger than the largest table that we expect |
* (the ACPI 5.0 version). If so, truncate the table, and issue |
* a warning. |
*/ |
if (length > sizeof(struct acpi_table_fadt)) { |
ACPI_BIOS_WARNING((AE_INFO, |
"FADT (revision %u) is longer than ACPI 5.0 version, " |
"truncating length %u to %u", |
table->revision, length, |
(u32)sizeof(struct acpi_table_fadt))); |
} |
|
/* Clear the entire local FADT */ |
|
memset(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt)); |
|
/* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */ |
|
memcpy(&acpi_gbl_FADT, table, |
ACPI_MIN(length, sizeof(struct acpi_table_fadt))); |
|
/* Take a copy of the Hardware Reduced flag */ |
|
acpi_gbl_reduced_hardware = FALSE; |
if (acpi_gbl_FADT.flags & ACPI_FADT_HW_REDUCED) { |
acpi_gbl_reduced_hardware = TRUE; |
} |
|
/* Convert the local copy of the FADT to the common internal format */ |
|
acpi_tb_convert_fadt(); |
|
/* Initialize the global ACPI register structures */ |
|
acpi_tb_setup_fadt_registers(); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_convert_fadt |
* |
* PARAMETERS: none - acpi_gbl_FADT is used. |
* |
* RETURN: None |
* |
* DESCRIPTION: Converts all versions of the FADT to a common internal format. |
* Expand 32-bit addresses to 64-bit as necessary. Also validate |
* important fields within the FADT. |
* |
* NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt), and must |
* contain a copy of the actual BIOS-provided FADT. |
* |
* Notes on 64-bit register addresses: |
* |
* After this FADT conversion, later ACPICA code will only use the 64-bit "X" |
* fields of the FADT for all ACPI register addresses. |
* |
* The 64-bit X fields are optional extensions to the original 32-bit FADT |
* V1.0 fields. Even if they are present in the FADT, they are optional and |
* are unused if the BIOS sets them to zero. Therefore, we must copy/expand |
* 32-bit V1.0 fields to the 64-bit X fields if the the 64-bit X field is |
* originally zero. |
* |
* For ACPI 1.0 FADTs (that contain no 64-bit addresses), all 32-bit address |
* fields are expanded to the corresponding 64-bit X fields in the internal |
* common FADT. |
* |
* For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded |
* to the corresponding 64-bit X fields, if the 64-bit field is originally |
* zero. Adhering to the ACPI specification, we completely ignore the 32-bit |
* field if the 64-bit field is valid, regardless of whether the host OS is |
* 32-bit or 64-bit. |
* |
* Possible additional checks: |
* (acpi_gbl_FADT.pm1_event_length >= 4) |
* (acpi_gbl_FADT.pm1_control_length >= 2) |
* (acpi_gbl_FADT.pm_timer_length >= 4) |
* Gpe block lengths must be multiple of 2 |
* |
******************************************************************************/ |
|
static void acpi_tb_convert_fadt(void) |
{ |
char *name; |
struct acpi_generic_address *address64; |
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); |
} |
} |
} |