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/******************************************************************************
*
* Module Name: tbinstal - ACPI table installation and removal
* $Revision: 45 $
*
*****************************************************************************/
/*
* Copyright (C) 2000, 2001 R. Byron Moore
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "acpi.h"
#include "achware.h"
#include "actables.h"
#define _COMPONENT ACPI_TABLES
MODULE_NAME ("tbinstal")
/*******************************************************************************
*
* FUNCTION: Acpi_tb_install_table
*
* PARAMETERS: Table_ptr - Input buffer pointer, optional
* Table_info - Return value from Acpi_tb_get_table
*
* RETURN: Status
*
* DESCRIPTION: Load and validate all tables other than the RSDT. The RSDT must
* already be loaded and validated.
* Install the table into the global data structs.
*
******************************************************************************/
acpi_status
acpi_tb_install_table (
acpi_table_header *table_ptr,
acpi_table_desc *table_info)
{
acpi_status status;
FUNCTION_TRACE ("Tb_install_table");
/*
* Check the table signature and make sure it is recognized
* Also checks the header checksum
*/
status = acpi_tb_recognize_table (table_ptr, table_info);
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
/* Lock tables while installing */
acpi_ut_acquire_mutex (ACPI_MTX_TABLES);
/* Install the table into the global data structure */
status = acpi_tb_init_table_descriptor (table_info->type, table_info);
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "%s located at %p\n",
acpi_gbl_acpi_table_data[table_info->type].name, table_info->pointer));
acpi_ut_release_mutex (ACPI_MTX_TABLES);
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_tb_recognize_table
*
* PARAMETERS: Table_ptr - Input buffer pointer, optional
* Table_info - Return value from Acpi_tb_get_table
*
* RETURN: Status
*
* DESCRIPTION: Check a table signature for a match against known table types
*
* NOTE: All table pointers are validated as follows:
* 1) Table pointer must point to valid physical memory
* 2) Signature must be 4 ASCII chars, even if we don't recognize the
* name
* 3) Table must be readable for length specified in the header
* 4) Table checksum must be valid (with the exception of the FACS
* which has no checksum for some odd reason)
*
******************************************************************************/
acpi_status
acpi_tb_recognize_table (
acpi_table_header *table_ptr,
acpi_table_desc *table_info)
{
acpi_table_header *table_header;
acpi_status status;
acpi_table_type table_type = 0;
u32 i;
FUNCTION_TRACE ("Tb_recognize_table");
/* Ensure that we have a valid table pointer */
table_header = (acpi_table_header *) table_info->pointer;
if (!table_header) {
return_ACPI_STATUS (AE_BAD_PARAMETER);
}
/*
* Search for a signature match among the known table types
* Start at index one -> Skip the RSDP
*/
status = AE_SUPPORT;
for (i = 1; i < NUM_ACPI_TABLES; i++) {
if (!STRNCMP (table_header->signature,
acpi_gbl_acpi_table_data[i].signature,
acpi_gbl_acpi_table_data[i].sig_length)) {
/*
* Found a signature match, get the pertinent info from the
* Table_data structure
*/
table_type = i;
status = acpi_gbl_acpi_table_data[i].status;
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "Found %4.4s\n",
(char*)acpi_gbl_acpi_table_data[i].signature));
break;
}
}
/* Return the table type and length via the info struct */
table_info->type = (u8) table_type;
table_info->length = table_header->length;
/*
* Validate checksum for _most_ tables,
* even the ones whose signature we don't recognize
*/
if (table_type != ACPI_TABLE_FACS) {
/* But don't abort if the checksum is wrong */
/* TBD: [Future] make this a configuration option? */
acpi_tb_verify_table_checksum (table_header);
}
/*
* An AE_SUPPORT means that the table was not recognized.
* We basically ignore this; just print a debug message
*/
if (status == AE_SUPPORT) {
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Unsupported table %s (Type %X) was found and discarded\n",
acpi_gbl_acpi_table_data[table_type].name, table_type));
}
return_ACPI_STATUS (status);
}
/*******************************************************************************
*
* FUNCTION: Acpi_tb_init_table_descriptor
*
* PARAMETERS: Table_type - The type of the table
* Table_info - A table info struct
*
* RETURN: None.
*
* DESCRIPTION: Install a table into the global data structs.
*
******************************************************************************/
acpi_status
acpi_tb_init_table_descriptor (
acpi_table_type table_type,
acpi_table_desc *table_info)
{
acpi_table_desc *list_head;
acpi_table_desc *table_desc;
FUNCTION_TRACE_U32 ("Tb_init_table_descriptor", table_type);
/*
* Install the table into the global data structure
*/
list_head = &acpi_gbl_acpi_tables[table_type];
table_desc = list_head;
/*
* Two major types of tables: 1) Only one instance is allowed. This
* includes most ACPI tables such as the DSDT. 2) Multiple instances of
* the table are allowed. This includes SSDT and PSDTs.
*/
if (IS_SINGLE_TABLE (acpi_gbl_acpi_table_data[table_type].flags)) {
/*
* Only one table allowed, and a table has alread been installed
* at this location, so return an error.
*/
if (list_head->pointer) {
return_ACPI_STATUS (AE_EXIST);
}
table_desc->count = 1;
}
else {
/*
* Multiple tables allowed for this table type, we must link
* the new table in to the list of tables of this type.
*/
if (list_head->pointer) {
table_desc = ACPI_MEM_CALLOCATE (sizeof (acpi_table_desc));
if (!table_desc) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
list_head->count++;
/* Update the original previous */
list_head->prev->next = table_desc;
/* Update new entry */
table_desc->prev = list_head->prev;
table_desc->next = list_head;
/* Update list head */
list_head->prev = table_desc;
}
else {
table_desc->count = 1;
}
}
/* Common initialization of the table descriptor */
table_desc->pointer = table_info->pointer;
table_desc->base_pointer = table_info->base_pointer;
table_desc->length = table_info->length;
table_desc->allocation = table_info->allocation;
table_desc->aml_start = (u8 *) (table_desc->pointer + 1),
table_desc->aml_length = (u32) (table_desc->length -
(u32) sizeof (acpi_table_header));
table_desc->table_id = acpi_ut_allocate_owner_id (OWNER_TYPE_TABLE);
table_desc->loaded_into_namespace = FALSE;
/*
* Set the appropriate global pointer (if there is one) to point to the
* newly installed table
*/
if (acpi_gbl_acpi_table_data[table_type].global_ptr) {
*(acpi_gbl_acpi_table_data[table_type].global_ptr) = table_info->pointer;
}
/* Return Data */
table_info->table_id = table_desc->table_id;
table_info->installed_desc = table_desc;
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: Acpi_tb_delete_acpi_tables
*
* PARAMETERS: None.
*
* RETURN: None.
*
* DESCRIPTION: Delete all internal ACPI tables
*
******************************************************************************/
void
acpi_tb_delete_acpi_tables (void)
{
acpi_table_type type;
/*
* Free memory allocated for ACPI tables
* Memory can either be mapped or allocated
*/
for (type = 0; type < NUM_ACPI_TABLES; type++) {
acpi_tb_delete_acpi_table (type);
}
}
/*******************************************************************************
*
* FUNCTION: Acpi_tb_delete_acpi_table
*
* PARAMETERS: Type - The table type to be deleted
*
* RETURN: None.
*
* DESCRIPTION: Delete an internal ACPI table
* Locks the ACPI table mutex
*
******************************************************************************/
void
acpi_tb_delete_acpi_table (
acpi_table_type type)
{
FUNCTION_TRACE_U32 ("Tb_delete_acpi_table", type);
if (type > ACPI_TABLE_MAX) {
return_VOID;
}
acpi_ut_acquire_mutex (ACPI_MTX_TABLES);
/* Free the table */
acpi_tb_free_acpi_tables_of_type (&acpi_gbl_acpi_tables[type]);
/* Clear the appropriate "typed" global table pointer */
switch (type) {
case ACPI_TABLE_RSDP:
acpi_gbl_RSDP = NULL;
break;
case ACPI_TABLE_DSDT:
acpi_gbl_DSDT = NULL;
break;
case ACPI_TABLE_FADT:
acpi_gbl_FADT = NULL;
break;
case ACPI_TABLE_FACS:
acpi_gbl_FACS = NULL;
break;
case ACPI_TABLE_XSDT:
acpi_gbl_XSDT = NULL;
break;
case ACPI_TABLE_SSDT:
case ACPI_TABLE_PSDT:
default:
break;
}
acpi_ut_release_mutex (ACPI_MTX_TABLES);
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: Acpi_tb_free_acpi_tables_of_type
*
* PARAMETERS: Table_info - A table info struct
*
* RETURN: None.
*
* DESCRIPTION: Free the memory associated with an internal ACPI table
* Table mutex should be locked.
*
******************************************************************************/
void
acpi_tb_free_acpi_tables_of_type (
acpi_table_desc *list_head)
{
acpi_table_desc *table_desc;
u32 count;
u32 i;
FUNCTION_TRACE_PTR ("Tb_free_acpi_tables_of_type", list_head);
/* Get the head of the list */
table_desc = list_head;
count = list_head->count;
/*
* Walk the entire list, deleting both the allocated tables
* and the table descriptors
*/
for (i = 0; i < count; i++) {
table_desc = acpi_tb_uninstall_table (table_desc);
}
return_VOID;
}
/*******************************************************************************
*
* FUNCTION: Acpi_tb_delete_single_table
*
* PARAMETERS: Table_info - A table info struct
*
* RETURN: None.
*
* DESCRIPTION: Low-level free for a single ACPI table. Handles cases where
* the table was allocated a buffer or was mapped.
*
******************************************************************************/
void
acpi_tb_delete_single_table (
acpi_table_desc *table_desc)
{
if (!table_desc) {
return;
}
if (table_desc->pointer) {
/* Valid table, determine type of memory allocation */
switch (table_desc->allocation) {
case ACPI_MEM_NOT_ALLOCATED:
break;
case ACPI_MEM_ALLOCATED:
ACPI_MEM_FREE (table_desc->base_pointer);
break;
case ACPI_MEM_MAPPED:
acpi_os_unmap_memory (table_desc->base_pointer, table_desc->length);
break;
}
}
}
/*******************************************************************************
*
* FUNCTION: Acpi_tb_uninstall_table
*
* PARAMETERS: Table_info - A table info struct
*
* RETURN: None.
*
* DESCRIPTION: Free the memory associated with an internal ACPI table that
* is either installed or has never been installed.
* Table mutex should be locked.
*
******************************************************************************/
acpi_table_desc *
acpi_tb_uninstall_table (
acpi_table_desc *table_desc)
{
acpi_table_desc *next_desc;
FUNCTION_TRACE_PTR ("Tb_delete_single_table", table_desc);
if (!table_desc) {
return_PTR (NULL);
}
/* Unlink the descriptor */
if (table_desc->prev) {
table_desc->prev->next = table_desc->next;
}
if (table_desc->next) {
table_desc->next->prev = table_desc->prev;
}
/* Free the memory allocated for the table itself */
acpi_tb_delete_single_table (table_desc);
/* Free the table descriptor (Don't delete the list head, tho) */
if ((table_desc->prev) == (table_desc->next)) {
next_desc = NULL;
/* Clear the list head */
table_desc->pointer = NULL;
table_desc->length = 0;
table_desc->count = 0;
}
else {
/* Free the table descriptor */
next_desc = table_desc->next;
ACPI_MEM_FREE (table_desc);
}
return_PTR (next_desc);
}
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