/******************************************************************************
*
* Module Name: tbfadt - FADT table utilities
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2011, 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 ACPI_INLINE void
acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
u8 space_id, u8 byte_width, u64 address);
static void acpi_tb_convert_fadt(void);
static void acpi_tb_validate_fadt(void);
static void acpi_tb_setup_fadt_registers(void);
/* Table for conversion of FADT to common internal format and FADT validation */
typedef struct acpi_fadt_info {
char *name;
u8 address64;
u8 address32;
u8 length;
u8 default_length;
u8 type;
} acpi_fadt_info;
#define ACPI_FADT_REQUIRED 1
#define ACPI_FADT_SEPARATE_LENGTH 2
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 */
0},
{"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,
0},
{"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_REQUIRED},
{"Gpe0Block",
ACPI_FADT_OFFSET(xgpe0_block),
ACPI_FADT_OFFSET(gpe0_block),
ACPI_FADT_OFFSET(gpe0_block_length),
0,
ACPI_FADT_SEPARATE_LENGTH},
{"Gpe1Block",
ACPI_FADT_OFFSET(xgpe1_block),
ACPI_FADT_OFFSET(gpe1_block),
ACPI_FADT_OFFSET(gpe1_block_length),
0,
ACPI_FADT_SEPARATE_LENGTH}
};
#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;
u8 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
* byte_width - Width of this register
* Address - Address of the register
*
* RETURN: None
*
* DESCRIPTION: Initialize a Generic Address Structure (GAS)
* See the ACPI specification for a full description and
* definition of this structure.
*
******************************************************************************/
static ACPI_INLINE void
acpi_tb_init_generic_address(struct acpi_generic_address *generic_address,
u8 space_id, u8 byte_width, u64 address)
{
/*
* 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 = (u8)ACPI_MUL_8(byte_width);
generic_address->bit_offset = 0;
generic_address->access_width = 0; /* Access width ANY */
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_parse_fadt
*
* PARAMETERS: table_index - Index for the FADT
*
* RETURN: None
*
* DESCRIPTION: Initialize the FADT, DSDT and FACS tables
* (FADT contains the addresses of the DSDT and FACS)
*
******************************************************************************/
void acpi_tb_parse_fadt(u32 table_index)
{
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[table_index].length;
table =
acpi_os_map_memory(acpi_gbl_root_table_list.tables[table_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_table((acpi_physical_address) acpi_gbl_FADT.Xdsdt,
ACPI_SIG_DSDT, ACPI_TABLE_INDEX_DSDT);
acpi_tb_install_table((acpi_physical_address) acpi_gbl_FADT.Xfacs,
ACPI_SIG_FACS, ACPI_TABLE_INDEX_FACS);
}
/*******************************************************************************
*
* 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 2.0/3.0 version). If so, truncate the table, and issue
* a warning.
*/
if (length > sizeof(struct acpi_table_fadt)) {
ACPI_WARNING((AE_INFO,
"FADT (revision %u) is longer than ACPI 2.0 version, "
"truncating length %u to %u",
table->revision, length,
(u32)sizeof(struct acpi_table_fadt)));
}
/* Clear the entire local FADT */
ACPI_MEMSET(&acpi_gbl_FADT, 0, sizeof(struct acpi_table_fadt));
/* Copy the original FADT, up to sizeof (struct acpi_table_fadt) */
ACPI_MEMCPY(&acpi_gbl_FADT, table,
ACPI_MIN(length, sizeof(struct acpi_table_fadt)));
/* Convert the local copy of the FADT to the common internal format */
acpi_tb_convert_fadt();
/* Validate FADT values now, before we make any changes */
acpi_tb_validate_fadt();
/* Initialize the global ACPI register structures */
acpi_tb_setup_fadt_registers();
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_convert_fadt
*
* PARAMETERS: None, uses acpi_gbl_FADT
*
* RETURN: None
*
* DESCRIPTION: Converts all versions of the FADT to a common internal format.
* Expand 32-bit addresses to 64-bit as necessary.
*
* NOTE: acpi_gbl_FADT must be of size (struct acpi_table_fadt),
* and must contain a copy of the actual 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 if the corresponding X field is zero.
*
* For ACPI 1.0 FADTs, all 32-bit address fields are expanded to the
* corresponding "X" fields in the internal FADT.
*
* For ACPI 2.0+ FADTs, all valid (non-zero) 32-bit address fields are expanded
* to the corresponding 64-bit X fields. For compatibility with other ACPI
* implementations, we ignore the 64-bit field if the 32-bit field is valid,
* regardless of whether the host OS is 32-bit or 64-bit.
*
******************************************************************************/
static void acpi_tb_convert_fadt(void)
{
struct acpi_generic_address *address64;
u32 address32;
u32 i;
/* Update the local FADT table header length */
acpi_gbl_FADT.header.length = sizeof(struct acpi_table_fadt);
/*
* Expand the 32-bit FACS and DSDT addresses to 64-bit as necessary.
* Later code will always use the X 64-bit field. Also, check for an
* address mismatch between the 32-bit and 64-bit address fields
* (FIRMWARE_CTRL/X_FIRMWARE_CTRL, DSDT/X_DSDT) which would indicate
* the presence of two FACS or two DSDT tables.
*/
if (!acpi_gbl_FADT.Xfacs) {
acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
} else if (acpi_gbl_FADT.facs &&
(acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
ACPI_WARNING((AE_INFO,
"32/64 FACS address mismatch in FADT - two FACS tables!"));
}
if (!acpi_gbl_FADT.Xdsdt) {
acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
} else if (acpi_gbl_FADT.dsdt &&
(acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
ACPI_WARNING((AE_INFO,
"32/64 DSDT address mismatch in FADT - two DSDT tables!"));
}
/*
* 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;
}
/*
* 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.
*
* March 2009:
* We now always use the 32-bit address if it is valid (non-null). This
* is not in accordance with the ACPI specification which states that
* the 64-bit address supersedes the 32-bit version, but we do this for
* compatibility with other ACPI implementations. Most notably, in the
* case where both the 32 and 64 versions are non-null, we use the 32-bit
* version. This is the only address that is guaranteed to have been
* tested by the BIOS manufacturer.
*/
for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
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);
/*
* If both 32- and 64-bit addresses are valid (non-zero),
* they must match.
*/
if (address64->address && address32 &&
(address64->address != (u64) address32)) {
ACPI_ERROR((AE_INFO,
"32/64X address mismatch in %s: 0x%8.8X/0x%8.8X%8.8X, using 32",
fadt_info_table[i].name, address32,
ACPI_FORMAT_UINT64(address64->address)));
}
/* Always use 32-bit address if it is valid (non-null) */
if (address32) {
/*
* Copy the 32-bit address to the 64-bit GAS structure. The
* Space ID is always I/O for 32-bit legacy address fields
*/
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);
}
}
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_validate_fadt
*
* PARAMETERS: Table - Pointer to the FADT to be validated
*
* RETURN: None
*
* DESCRIPTION: Validate various important fields within the FADT. If a problem
* is found, issue a message, but no status is returned.
* Used by both the table manager and the disassembler.
*
* Possible additional checks:
* (acpi_gbl_FADT.pm1_event_length >= 4)
* (acpi_gbl_FADT.pm1_control_length >= 2)
* (acpi_gbl_FADT.pm_timer_length >= 4)
* Gpe block lengths must be multiple of 2
*
******************************************************************************/
static void acpi_tb_validate_fadt(void)
{
char *name;
struct acpi_generic_address *address64;
u8 length;
u32 i;
/*
* Check for FACS and DSDT address mismatches. An address mismatch between
* the 32-bit and 64-bit address fields (FIRMWARE_CTRL/X_FIRMWARE_CTRL and
* DSDT/X_DSDT) would indicate the presence of two FACS or two DSDT tables.
*/
if (acpi_gbl_FADT.facs &&
(acpi_gbl_FADT.Xfacs != (u64) acpi_gbl_FADT.facs)) {
ACPI_WARNING((AE_INFO,
"32/64X FACS address mismatch in FADT - "
"0x%8.8X/0x%8.8X%8.8X, using 32",
acpi_gbl_FADT.facs,
ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xfacs)));
acpi_gbl_FADT.Xfacs = (u64) acpi_gbl_FADT.facs;
}
if (acpi_gbl_FADT.dsdt &&
(acpi_gbl_FADT.Xdsdt != (u64) acpi_gbl_FADT.dsdt)) {
ACPI_WARNING((AE_INFO,
"32/64X DSDT address mismatch in FADT - "
"0x%8.8X/0x%8.8X%8.8X, using 32",
acpi_gbl_FADT.dsdt,
ACPI_FORMAT_UINT64(acpi_gbl_FADT.Xdsdt)));
acpi_gbl_FADT.Xdsdt = (u64) acpi_gbl_FADT.dsdt;
}
/* Examine all of the 64-bit extended address fields (X fields) */
for (i = 0; i < ACPI_FADT_INFO_ENTRIES; i++) {
/*
* Generate pointer to the 64-bit address, get the register
* length (width) and the register name
*/
address64 = ACPI_ADD_PTR(struct acpi_generic_address,
&acpi_gbl_FADT,
fadt_info_table[i].address64);
length =
*ACPI_ADD_PTR(u8, &acpi_gbl_FADT,
fadt_info_table[i].length);
name = fadt_info_table[i].name;
/*
* For each extended field, check for length mismatch between the
* legacy length field and the corresponding 64-bit X length field.
*/
if (address64->address &&
(address64->bit_width != ACPI_MUL_8(length))) {
ACPI_WARNING((AE_INFO,
"32/64X length mismatch in %s: %u/%u",
name, ACPI_MUL_8(length),
address64->bit_width));
}
if (fadt_info_table[i].type & ACPI_FADT_REQUIRED) {
/*
* Field is required (Pm1a_event, Pm1a_control, pm_timer).
* Both the address and length must be non-zero.
*/
if (!address64->address || !length) {
ACPI_ERROR((AE_INFO,
"Required field %s has zero address and/or length:"
" 0x%8.8X%8.8X/0x%X",
name,
ACPI_FORMAT_UINT64(address64->
address),
length));
}
} else if (fadt_info_table[i].type & ACPI_FADT_SEPARATE_LENGTH) {
/*
* Field is optional (PM2Control, 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_WARNING((AE_INFO,
"Optional 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_WARNING((AE_INFO,
"Invalid length for %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));
}
}
}