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linux-stable-rt/drivers/acpi/tables/tbconvrt.c

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/******************************************************************************
*
* Module Name: tbconvrt - ACPI Table conversion utilities
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2005, R. Byron Moore
* 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 <linux/module.h>
#include <acpi/acpi.h>
#include <acpi/actables.h>
#define _COMPONENT ACPI_TABLES
ACPI_MODULE_NAME ("tbconvrt")
/* Local prototypes */
static void
acpi_tb_init_generic_address (
struct acpi_generic_address *new_gas_struct,
u8 register_bit_width,
acpi_physical_address address);
static void
acpi_tb_convert_fadt1 (
struct fadt_descriptor_rev2 *local_fadt,
struct fadt_descriptor_rev1 *original_fadt);
static void
acpi_tb_convert_fadt2 (
struct fadt_descriptor_rev2 *local_fadt,
struct fadt_descriptor_rev2 *original_fadt);
u8 acpi_fadt_is_v1;
EXPORT_SYMBOL(acpi_fadt_is_v1);
/*******************************************************************************
*
* FUNCTION: acpi_tb_get_table_count
*
* PARAMETERS: RSDP - Pointer to the RSDP
* RSDT - Pointer to the RSDT/XSDT
*
* RETURN: The number of tables pointed to by the RSDT or XSDT.
*
* DESCRIPTION: Calculate the number of tables. Automatically handles either
* an RSDT or XSDT.
*
******************************************************************************/
u32
acpi_tb_get_table_count (
struct rsdp_descriptor *RSDP,
struct acpi_table_header *RSDT)
{
u32 pointer_size;
ACPI_FUNCTION_ENTRY ();
/* RSDT pointers are 32 bits, XSDT pointers are 64 bits */
if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
pointer_size = sizeof (u32);
}
else {
pointer_size = sizeof (u64);
}
/*
* Determine the number of tables pointed to by the RSDT/XSDT.
* This is defined by the ACPI Specification to be the number of
* pointers contained within the RSDT/XSDT. The size of the pointers
* is architecture-dependent.
*/
return ((RSDT->length - sizeof (struct acpi_table_header)) / pointer_size);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_convert_to_xsdt
*
* PARAMETERS: table_info - Info about the RSDT
*
* RETURN: Status
*
* DESCRIPTION: Convert an RSDT to an XSDT (internal common format)
*
******************************************************************************/
acpi_status
acpi_tb_convert_to_xsdt (
struct acpi_table_desc *table_info)
{
acpi_size table_size;
u32 i;
XSDT_DESCRIPTOR *new_table;
ACPI_FUNCTION_ENTRY ();
/* Compute size of the converted XSDT */
table_size = ((acpi_size) acpi_gbl_rsdt_table_count * sizeof (u64)) +
sizeof (struct acpi_table_header);
/* Allocate an XSDT */
new_table = ACPI_MEM_CALLOCATE (table_size);
if (!new_table) {
return (AE_NO_MEMORY);
}
/* Copy the header and set the length */
ACPI_MEMCPY (new_table, table_info->pointer, sizeof (struct acpi_table_header));
new_table->length = (u32) table_size;
/* Copy the table pointers */
for (i = 0; i < acpi_gbl_rsdt_table_count; i++) {
/* RSDT pointers are 32 bits, XSDT pointers are 64 bits */
if (acpi_gbl_root_table_type == ACPI_TABLE_TYPE_RSDT) {
ACPI_STORE_ADDRESS (new_table->table_offset_entry[i],
(ACPI_CAST_PTR (struct rsdt_descriptor_rev1,
table_info->pointer))->table_offset_entry[i]);
}
else {
new_table->table_offset_entry[i] =
(ACPI_CAST_PTR (XSDT_DESCRIPTOR,
table_info->pointer))->table_offset_entry[i];
}
}
/* Delete the original table (either mapped or in a buffer) */
acpi_tb_delete_single_table (table_info);
/* Point the table descriptor to the new table */
table_info->pointer = ACPI_CAST_PTR (struct acpi_table_header, new_table);
table_info->length = table_size;
table_info->allocation = ACPI_MEM_ALLOCATED;
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_init_generic_address
*
* PARAMETERS: new_gas_struct - GAS struct to be initialized
* register_bit_width - Width of this register
* Address - Address of the register
*
* RETURN: None
*
* DESCRIPTION: Initialize a GAS structure.
*
******************************************************************************/
static void
acpi_tb_init_generic_address (
struct acpi_generic_address *new_gas_struct,
u8 register_bit_width,
acpi_physical_address address)
{
ACPI_STORE_ADDRESS (new_gas_struct->address, address);
new_gas_struct->address_space_id = ACPI_ADR_SPACE_SYSTEM_IO;
new_gas_struct->register_bit_width = register_bit_width;
new_gas_struct->register_bit_offset = 0;
new_gas_struct->access_width = 0;
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_convert_fadt1
*
* PARAMETERS: local_fadt - Pointer to new FADT
* original_fadt - Pointer to old FADT
*
* RETURN: None, populates local_fadt
*
* DESCRIPTION: Convert an ACPI 1.0 FADT to common internal format
*
******************************************************************************/
static void
acpi_tb_convert_fadt1 (
struct fadt_descriptor_rev2 *local_fadt,
struct fadt_descriptor_rev1 *original_fadt)
{
/* ACPI 1.0 FACS */
/* The BIOS stored FADT should agree with Revision 1.0 */
acpi_fadt_is_v1 = 1;
/*
* Copy the table header and the common part of the tables.
*
* The 2.0 table is an extension of the 1.0 table, so the entire 1.0
* table can be copied first, then expand some fields to 64 bits.
*/
ACPI_MEMCPY (local_fadt, original_fadt, sizeof (struct fadt_descriptor_rev1));
/* Convert table pointers to 64-bit fields */
ACPI_STORE_ADDRESS (local_fadt->xfirmware_ctrl, local_fadt->V1_firmware_ctrl);
ACPI_STORE_ADDRESS (local_fadt->Xdsdt, local_fadt->V1_dsdt);
/*
* System Interrupt Model isn't used in ACPI 2.0
* (local_fadt->Reserved1 = 0;)
*/
/*
* This field is set by the OEM to convey the preferred power management
* profile to OSPM. It doesn't have any 1.0 equivalence. Since we don't
* know what kind of 32-bit system this is, we will use "unspecified".
*/
local_fadt->prefer_PM_profile = PM_UNSPECIFIED;
/*
* Processor Performance State Control. This is the value OSPM writes to
* the SMI_CMD register to assume processor performance state control
* responsibility. There isn't any equivalence in 1.0, but as many 1.x
* ACPI tables contain _PCT and _PSS we also keep this value, unless
* acpi_strict is set.
*/
if (acpi_strict)
local_fadt->pstate_cnt = 0;
/*
* Support for the _CST object and C States change notification.
* This data item hasn't any 1.0 equivalence so leave it zero.
*/
local_fadt->cst_cnt = 0;
/*
* FADT Rev 2 was an interim FADT released between ACPI 1.0 and ACPI 2.0.
* It primarily adds the FADT reset mechanism.
*/
if ((original_fadt->revision == 2) &&
(original_fadt->length == sizeof (struct fadt_descriptor_rev2_minus))) {
/*
* Grab the entire generic address struct, plus the 1-byte reset value
* that immediately follows.
*/
ACPI_MEMCPY (&local_fadt->reset_register,
&(ACPI_CAST_PTR (struct fadt_descriptor_rev2_minus,
original_fadt))->reset_register,
sizeof (struct acpi_generic_address) + 1);
}
else {
/*
* Since there isn't any equivalence in 1.0 and since it is highly
* likely that a 1.0 system has legacy support.
*/
local_fadt->iapc_boot_arch = BAF_LEGACY_DEVICES;
}
/*
* Convert the V1.0 block addresses to V2.0 GAS structures
*/
acpi_tb_init_generic_address (&local_fadt->xpm1a_evt_blk, local_fadt->pm1_evt_len,
(acpi_physical_address) local_fadt->V1_pm1a_evt_blk);
acpi_tb_init_generic_address (&local_fadt->xpm1b_evt_blk, local_fadt->pm1_evt_len,
(acpi_physical_address) local_fadt->V1_pm1b_evt_blk);
acpi_tb_init_generic_address (&local_fadt->xpm1a_cnt_blk, local_fadt->pm1_cnt_len,
(acpi_physical_address) local_fadt->V1_pm1a_cnt_blk);
acpi_tb_init_generic_address (&local_fadt->xpm1b_cnt_blk, local_fadt->pm1_cnt_len,
(acpi_physical_address) local_fadt->V1_pm1b_cnt_blk);
acpi_tb_init_generic_address (&local_fadt->xpm2_cnt_blk, local_fadt->pm2_cnt_len,
(acpi_physical_address) local_fadt->V1_pm2_cnt_blk);
acpi_tb_init_generic_address (&local_fadt->xpm_tmr_blk, local_fadt->pm_tm_len,
(acpi_physical_address) local_fadt->V1_pm_tmr_blk);
acpi_tb_init_generic_address (&local_fadt->xgpe0_blk, 0,
(acpi_physical_address) local_fadt->V1_gpe0_blk);
acpi_tb_init_generic_address (&local_fadt->xgpe1_blk, 0,
(acpi_physical_address) local_fadt->V1_gpe1_blk);
/* Create separate GAS structs for the PM1 Enable registers */
acpi_tb_init_generic_address (&acpi_gbl_xpm1a_enable,
(u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
(acpi_physical_address)
(local_fadt->xpm1a_evt_blk.address +
ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
/* PM1B is optional; leave null if not present */
if (local_fadt->xpm1b_evt_blk.address) {
acpi_tb_init_generic_address (&acpi_gbl_xpm1b_enable,
(u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
(acpi_physical_address)
(local_fadt->xpm1b_evt_blk.address +
ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
}
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_convert_fadt2
*
* PARAMETERS: local_fadt - Pointer to new FADT
* original_fadt - Pointer to old FADT
*
* RETURN: None, populates local_fadt
*
* DESCRIPTION: Convert an ACPI 2.0 FADT to common internal format.
* Handles optional "X" fields.
*
******************************************************************************/
static void
acpi_tb_convert_fadt2 (
struct fadt_descriptor_rev2 *local_fadt,
struct fadt_descriptor_rev2 *original_fadt)
{
/* We have an ACPI 2.0 FADT but we must copy it to our local buffer */
ACPI_MEMCPY (local_fadt, original_fadt, sizeof (struct fadt_descriptor_rev2));
/*
* "X" fields are optional extensions to the original V1.0 fields, so
* we must selectively expand V1.0 fields if the corresponding X field
* is zero.
*/
if (!(local_fadt->xfirmware_ctrl)) {
ACPI_STORE_ADDRESS (local_fadt->xfirmware_ctrl,
local_fadt->V1_firmware_ctrl);
}
if (!(local_fadt->Xdsdt)) {
ACPI_STORE_ADDRESS (local_fadt->Xdsdt, local_fadt->V1_dsdt);
}
if (!(local_fadt->xpm1a_evt_blk.address)) {
acpi_tb_init_generic_address (&local_fadt->xpm1a_evt_blk,
local_fadt->pm1_evt_len,
(acpi_physical_address) local_fadt->V1_pm1a_evt_blk);
}
if (!(local_fadt->xpm1b_evt_blk.address)) {
acpi_tb_init_generic_address (&local_fadt->xpm1b_evt_blk,
local_fadt->pm1_evt_len,
(acpi_physical_address) local_fadt->V1_pm1b_evt_blk);
}
if (!(local_fadt->xpm1a_cnt_blk.address)) {
acpi_tb_init_generic_address (&local_fadt->xpm1a_cnt_blk,
local_fadt->pm1_cnt_len,
(acpi_physical_address) local_fadt->V1_pm1a_cnt_blk);
}
if (!(local_fadt->xpm1b_cnt_blk.address)) {
acpi_tb_init_generic_address (&local_fadt->xpm1b_cnt_blk,
local_fadt->pm1_cnt_len,
(acpi_physical_address) local_fadt->V1_pm1b_cnt_blk);
}
if (!(local_fadt->xpm2_cnt_blk.address)) {
acpi_tb_init_generic_address (&local_fadt->xpm2_cnt_blk,
local_fadt->pm2_cnt_len,
(acpi_physical_address) local_fadt->V1_pm2_cnt_blk);
}
if (!(local_fadt->xpm_tmr_blk.address)) {
acpi_tb_init_generic_address (&local_fadt->xpm_tmr_blk,
local_fadt->pm_tm_len,
(acpi_physical_address) local_fadt->V1_pm_tmr_blk);
}
if (!(local_fadt->xgpe0_blk.address)) {
acpi_tb_init_generic_address (&local_fadt->xgpe0_blk,
0, (acpi_physical_address) local_fadt->V1_gpe0_blk);
}
if (!(local_fadt->xgpe1_blk.address)) {
acpi_tb_init_generic_address (&local_fadt->xgpe1_blk,
0, (acpi_physical_address) local_fadt->V1_gpe1_blk);
}
/* Create separate GAS structs for the PM1 Enable registers */
acpi_tb_init_generic_address (&acpi_gbl_xpm1a_enable,
(u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
(acpi_physical_address)
(local_fadt->xpm1a_evt_blk.address +
ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
acpi_gbl_xpm1a_enable.address_space_id =
local_fadt->xpm1a_evt_blk.address_space_id;
/* PM1B is optional; leave null if not present */
if (local_fadt->xpm1b_evt_blk.address) {
acpi_tb_init_generic_address (&acpi_gbl_xpm1b_enable,
(u8) ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len),
(acpi_physical_address)
(local_fadt->xpm1b_evt_blk.address +
ACPI_DIV_2 (acpi_gbl_FADT->pm1_evt_len)));
acpi_gbl_xpm1b_enable.address_space_id =
local_fadt->xpm1b_evt_blk.address_space_id;
}
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_convert_table_fadt
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Converts a BIOS supplied ACPI 1.0 FADT to a local
* ACPI 2.0 FADT. If the BIOS supplied a 2.0 FADT then it is simply
* copied to the local FADT. The ACPI CA software uses this
* local FADT. Thus a significant amount of special #ifdef
* type codeing is saved.
*
******************************************************************************/
acpi_status
acpi_tb_convert_table_fadt (
void)
{
struct fadt_descriptor_rev2 *local_fadt;
struct acpi_table_desc *table_desc;
ACPI_FUNCTION_TRACE ("tb_convert_table_fadt");
/*
* acpi_gbl_FADT is valid. Validate the FADT length. The table must be
* at least as long as the version 1.0 FADT
*/
if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev1)) {
ACPI_REPORT_ERROR (("FADT is invalid, too short: 0x%X\n",
acpi_gbl_FADT->length));
return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
}
/* Allocate buffer for the ACPI 2.0(+) FADT */
local_fadt = ACPI_MEM_CALLOCATE (sizeof (struct fadt_descriptor_rev2));
if (!local_fadt) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
if (acpi_gbl_FADT->revision >= FADT2_REVISION_ID) {
if (acpi_gbl_FADT->length < sizeof (struct fadt_descriptor_rev2)) {
/* Length is too short to be a V2.0 table */
ACPI_REPORT_WARNING ((
"Inconsistent FADT length (0x%X) and revision (0x%X), using FADT V1.0 portion of table\n",
acpi_gbl_FADT->length, acpi_gbl_FADT->revision));
acpi_tb_convert_fadt1 (local_fadt, (void *) acpi_gbl_FADT);
}
else {
/* Valid V2.0 table */
acpi_tb_convert_fadt2 (local_fadt, acpi_gbl_FADT);
}
}
else {
/* Valid V1.0 table */
acpi_tb_convert_fadt1 (local_fadt, (void *) acpi_gbl_FADT);
}
/* Global FADT pointer will point to the new common V2.0 FADT */
acpi_gbl_FADT = local_fadt;
acpi_gbl_FADT->length = sizeof (FADT_DESCRIPTOR);
/* Free the original table */
table_desc = acpi_gbl_table_lists[ACPI_TABLE_FADT].next;
acpi_tb_delete_single_table (table_desc);
/* Install the new table */
table_desc->pointer = ACPI_CAST_PTR (struct acpi_table_header, acpi_gbl_FADT);
table_desc->allocation = ACPI_MEM_ALLOCATED;
table_desc->length = sizeof (struct fadt_descriptor_rev2);
/* Dump the entire FADT */
ACPI_DEBUG_PRINT ((ACPI_DB_TABLES,
"Hex dump of common internal FADT, size %d (%X)\n",
acpi_gbl_FADT->length, acpi_gbl_FADT->length));
ACPI_DUMP_BUFFER ((u8 *) (acpi_gbl_FADT), acpi_gbl_FADT->length);
return_ACPI_STATUS (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_tb_build_common_facs
*
* PARAMETERS: table_info - Info for currently installed FACS
*
* RETURN: Status
*
* DESCRIPTION: Convert ACPI 1.0 and ACPI 2.0 FACS to a common internal
* table format.
*
******************************************************************************/
acpi_status
acpi_tb_build_common_facs (
struct acpi_table_desc *table_info)
{
ACPI_FUNCTION_TRACE ("tb_build_common_facs");
/* Absolute minimum length is 24, but the ACPI spec says 64 */
if (acpi_gbl_FACS->length < 24) {
ACPI_REPORT_ERROR (("Invalid FACS table length: 0x%X\n",
acpi_gbl_FACS->length));
return_ACPI_STATUS (AE_INVALID_TABLE_LENGTH);
}
if (acpi_gbl_FACS->length < 64) {
ACPI_REPORT_WARNING ((
"FACS is shorter than the ACPI specification allows: 0x%X, using anyway\n",
acpi_gbl_FACS->length));
}
/* Copy fields to the new FACS */
acpi_gbl_common_fACS.global_lock = &(acpi_gbl_FACS->global_lock);
if ((acpi_gbl_RSDP->revision < 2) ||
(acpi_gbl_FACS->length < 32) ||
(!(acpi_gbl_FACS->xfirmware_waking_vector))) {
/* ACPI 1.0 FACS or short table or optional X_ field is zero */
acpi_gbl_common_fACS.firmware_waking_vector = ACPI_CAST_PTR (u64,
&(acpi_gbl_FACS->firmware_waking_vector));
acpi_gbl_common_fACS.vector_width = 32;
}
else {
/* ACPI 2.0 FACS with valid X_ field */
acpi_gbl_common_fACS.firmware_waking_vector = &acpi_gbl_FACS->xfirmware_waking_vector;
acpi_gbl_common_fACS.vector_width = 64;
}
return_ACPI_STATUS (AE_OK);
}
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