tbconvrt.c

h内核

/******************************************************************************
 *
 * 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")


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 ();


	if (RSDP->revision < 2) {
		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++) {
		if (acpi_gbl_RSDP->revision < 2) {
			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:      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;
	}

	/*