0,0 → 1,417 |
/****************************************************************************** |
* |
* Module Name: tbutils - ACPI 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("tbutils") |
|
/* Local prototypes */ |
static acpi_physical_address |
acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size); |
|
#if (!ACPI_REDUCED_HARDWARE) |
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_initialize_facs |
* |
* PARAMETERS: None |
* |
* RETURN: Status |
* |
* DESCRIPTION: Create a permanent mapping for the FADT and save it in a global |
* for accessing the Global Lock and Firmware Waking Vector |
* |
******************************************************************************/ |
|
acpi_status acpi_tb_initialize_facs(void) |
{ |
struct acpi_table_facs *facs; |
|
/* If Hardware Reduced flag is set, there is no FACS */ |
|
if (acpi_gbl_reduced_hardware) { |
acpi_gbl_FACS = NULL; |
return (AE_OK); |
} else if (acpi_gbl_FADT.Xfacs && |
(!acpi_gbl_FADT.facs |
|| !acpi_gbl_use32_bit_facs_addresses)) { |
(void)acpi_get_table_by_index(acpi_gbl_xfacs_index, |
ACPI_CAST_INDIRECT_PTR(struct |
acpi_table_header, |
&facs)); |
acpi_gbl_FACS = facs; |
} else if (acpi_gbl_FADT.facs) { |
(void)acpi_get_table_by_index(acpi_gbl_facs_index, |
ACPI_CAST_INDIRECT_PTR(struct |
acpi_table_header, |
&facs)); |
acpi_gbl_FACS = facs; |
} |
|
/* If there is no FACS, just continue. There was already an error msg */ |
|
return (AE_OK); |
} |
#endif /* !ACPI_REDUCED_HARDWARE */ |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_check_dsdt_header |
* |
* PARAMETERS: None |
* |
* RETURN: None |
* |
* DESCRIPTION: Quick compare to check validity of the DSDT. This will detect |
* if the DSDT has been replaced from outside the OS and/or if |
* the DSDT header has been corrupted. |
* |
******************************************************************************/ |
|
void acpi_tb_check_dsdt_header(void) |
{ |
|
/* Compare original length and checksum to current values */ |
|
if (acpi_gbl_original_dsdt_header.length != acpi_gbl_DSDT->length || |
acpi_gbl_original_dsdt_header.checksum != acpi_gbl_DSDT->checksum) { |
ACPI_BIOS_ERROR((AE_INFO, |
"The DSDT has been corrupted or replaced - " |
"old, new headers below")); |
acpi_tb_print_table_header(0, &acpi_gbl_original_dsdt_header); |
acpi_tb_print_table_header(0, acpi_gbl_DSDT); |
|
ACPI_ERROR((AE_INFO, |
"Please send DMI info to linux-acpi@vger.kernel.org\n" |
"If system does not work as expected, please boot with acpi=copy_dsdt")); |
|
/* Disable further error messages */ |
|
acpi_gbl_original_dsdt_header.length = acpi_gbl_DSDT->length; |
acpi_gbl_original_dsdt_header.checksum = |
acpi_gbl_DSDT->checksum; |
} |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_copy_dsdt |
* |
* PARAMETERS: table_desc - Installed table to copy |
* |
* RETURN: None |
* |
* DESCRIPTION: Implements a subsystem option to copy the DSDT to local memory. |
* Some very bad BIOSs are known to either corrupt the DSDT or |
* install a new, bad DSDT. This copy works around the problem. |
* |
******************************************************************************/ |
|
struct acpi_table_header *acpi_tb_copy_dsdt(u32 table_index) |
{ |
struct acpi_table_header *new_table; |
struct acpi_table_desc *table_desc; |
|
table_desc = &acpi_gbl_root_table_list.tables[table_index]; |
|
new_table = ACPI_ALLOCATE(table_desc->length); |
if (!new_table) { |
ACPI_ERROR((AE_INFO, "Could not copy DSDT of length 0x%X", |
table_desc->length)); |
return (NULL); |
} |
|
memcpy(new_table, table_desc->pointer, table_desc->length); |
acpi_tb_uninstall_table(table_desc); |
|
acpi_tb_init_table_descriptor(&acpi_gbl_root_table_list. |
tables[acpi_gbl_dsdt_index], |
ACPI_PTR_TO_PHYSADDR(new_table), |
ACPI_TABLE_ORIGIN_INTERNAL_VIRTUAL, |
new_table); |
|
ACPI_INFO((AE_INFO, |
"Forced DSDT copy: length 0x%05X copied locally, original unmapped", |
new_table->length)); |
|
return (new_table); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_get_root_table_entry |
* |
* PARAMETERS: table_entry - Pointer to the RSDT/XSDT table entry |
* table_entry_size - sizeof 32 or 64 (RSDT or XSDT) |
* |
* RETURN: Physical address extracted from the root table |
* |
* DESCRIPTION: Get one root table entry. Handles 32-bit and 64-bit cases on |
* both 32-bit and 64-bit platforms |
* |
* NOTE: acpi_physical_address is 32-bit on 32-bit platforms, 64-bit on |
* 64-bit platforms. |
* |
******************************************************************************/ |
|
static acpi_physical_address |
acpi_tb_get_root_table_entry(u8 *table_entry, u32 table_entry_size) |
{ |
u64 address64; |
|
/* |
* Get the table physical address (32-bit for RSDT, 64-bit for XSDT): |
* Note: Addresses are 32-bit aligned (not 64) in both RSDT and XSDT |
*/ |
if (table_entry_size == ACPI_RSDT_ENTRY_SIZE) { |
/* |
* 32-bit platform, RSDT: Return 32-bit table entry |
* 64-bit platform, RSDT: Expand 32-bit to 64-bit and return |
*/ |
return ((acpi_physical_address) |
(*ACPI_CAST_PTR(u32, table_entry))); |
} else { |
/* |
* 32-bit platform, XSDT: Truncate 64-bit to 32-bit and return |
* 64-bit platform, XSDT: Move (unaligned) 64-bit to local, |
* return 64-bit |
*/ |
ACPI_MOVE_64_TO_64(&address64, table_entry); |
|
#if ACPI_MACHINE_WIDTH == 32 |
if (address64 > ACPI_UINT32_MAX) { |
|
/* Will truncate 64-bit address to 32 bits, issue warning */ |
|
ACPI_BIOS_WARNING((AE_INFO, |
"64-bit Physical Address in XSDT is too large (0x%8.8X%8.8X)," |
" truncating", |
ACPI_FORMAT_UINT64(address64))); |
} |
#endif |
return ((acpi_physical_address) (address64)); |
} |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_tb_parse_root_table |
* |
* PARAMETERS: rsdp - Pointer to the RSDP |
* |
* RETURN: Status |
* |
* DESCRIPTION: This function is called to parse the Root System Description |
* Table (RSDT or XSDT) |
* |
* NOTE: Tables are mapped (not copied) for efficiency. The FACS must |
* be mapped and cannot be copied because it contains the actual |
* memory location of the ACPI Global Lock. |
* |
******************************************************************************/ |
|
acpi_status __init acpi_tb_parse_root_table(acpi_physical_address rsdp_address) |
{ |
struct acpi_table_rsdp *rsdp; |
u32 table_entry_size; |
u32 i; |
u32 table_count; |
struct acpi_table_header *table; |
acpi_physical_address address; |
u32 length; |
u8 *table_entry; |
acpi_status status; |
u32 table_index; |
|
ACPI_FUNCTION_TRACE(tb_parse_root_table); |
|
/* Map the entire RSDP and extract the address of the RSDT or XSDT */ |
|
rsdp = acpi_os_map_memory(rsdp_address, sizeof(struct acpi_table_rsdp)); |
if (!rsdp) { |
return_ACPI_STATUS(AE_NO_MEMORY); |
} |
|
acpi_tb_print_table_header(rsdp_address, |
ACPI_CAST_PTR(struct acpi_table_header, |
rsdp)); |
|
/* Use XSDT if present and not overridden. Otherwise, use RSDT */ |
|
if ((rsdp->revision > 1) && |
rsdp->xsdt_physical_address && !acpi_gbl_do_not_use_xsdt) { |
/* |
* RSDP contains an XSDT (64-bit physical addresses). We must use |
* the XSDT if the revision is > 1 and the XSDT pointer is present, |
* as per the ACPI specification. |
*/ |
address = (acpi_physical_address) rsdp->xsdt_physical_address; |
table_entry_size = ACPI_XSDT_ENTRY_SIZE; |
} else { |
/* Root table is an RSDT (32-bit physical addresses) */ |
|
address = (acpi_physical_address) rsdp->rsdt_physical_address; |
table_entry_size = ACPI_RSDT_ENTRY_SIZE; |
} |
|
/* |
* It is not possible to map more than one entry in some environments, |
* so unmap the RSDP here before mapping other tables |
*/ |
acpi_os_unmap_memory(rsdp, sizeof(struct acpi_table_rsdp)); |
|
/* Map the RSDT/XSDT table header to get the full table length */ |
|
table = acpi_os_map_memory(address, sizeof(struct acpi_table_header)); |
if (!table) { |
return_ACPI_STATUS(AE_NO_MEMORY); |
} |
|
acpi_tb_print_table_header(address, table); |
|
/* |
* Validate length of the table, and map entire table. |
* Minimum length table must contain at least one entry. |
*/ |
length = table->length; |
acpi_os_unmap_memory(table, sizeof(struct acpi_table_header)); |
|
if (length < (sizeof(struct acpi_table_header) + table_entry_size)) { |
ACPI_BIOS_ERROR((AE_INFO, |
"Invalid table length 0x%X in RSDT/XSDT", |
length)); |
return_ACPI_STATUS(AE_INVALID_TABLE_LENGTH); |
} |
|
table = acpi_os_map_memory(address, length); |
if (!table) { |
return_ACPI_STATUS(AE_NO_MEMORY); |
} |
|
/* Validate the root table checksum */ |
|
status = acpi_tb_verify_checksum(table, length); |
if (ACPI_FAILURE(status)) { |
acpi_os_unmap_memory(table, length); |
return_ACPI_STATUS(status); |
} |
|
/* Get the number of entries and pointer to first entry */ |
|
table_count = (u32)((table->length - sizeof(struct acpi_table_header)) / |
table_entry_size); |
table_entry = ACPI_ADD_PTR(u8, table, sizeof(struct acpi_table_header)); |
|
/* Initialize the root table array from the RSDT/XSDT */ |
|
for (i = 0; i < table_count; i++) { |
|
/* Get the table physical address (32-bit for RSDT, 64-bit for XSDT) */ |
|
address = |
acpi_tb_get_root_table_entry(table_entry, table_entry_size); |
|
/* Skip NULL entries in RSDT/XSDT */ |
|
if (!address) { |
goto next_table; |
} |
|
status = acpi_tb_install_standard_table(address, |
ACPI_TABLE_ORIGIN_INTERNAL_PHYSICAL, |
FALSE, TRUE, |
&table_index); |
|
if (ACPI_SUCCESS(status) && |
ACPI_COMPARE_NAME(&acpi_gbl_root_table_list. |
tables[table_index].signature, |
ACPI_SIG_FADT)) { |
acpi_gbl_fadt_index = table_index; |
acpi_tb_parse_fadt(); |
} |
|
next_table: |
|
table_entry += table_entry_size; |
} |
|
acpi_os_unmap_memory(table, length); |
|
return_ACPI_STATUS(AE_OK); |
} |
|
/******************************************************************************* |
* |
* FUNCTION: acpi_is_valid_signature |
* |
* PARAMETERS: signature - Sig string to be validated |
* |
* RETURN: TRUE if signature is correct length and has valid characters |
* |
* DESCRIPTION: Validate an ACPI table signature. |
* |
******************************************************************************/ |
|
u8 acpi_is_valid_signature(char *signature) |
{ |
u32 i; |
|
/* Validate the signature length */ |
|
if (strlen(signature) != ACPI_NAME_SIZE) { |
return (FALSE); |
} |
|
/* Validate each character in the signature */ |
|
for (i = 0; i < ACPI_NAME_SIZE; i++) { |
if (!acpi_ut_valid_acpi_char(signature[i], i)) { |
return (FALSE); |
} |
} |
|
return (TRUE); |
} |