mirror of
https://github.com/reactos/reactos.git
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303 lines
7.6 KiB
C
303 lines
7.6 KiB
C
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/******************************************************************************
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*
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* Module Name: hwacpi - ACPI Hardware Initialization/Mode Interface
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* $Revision: 1.1 $
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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000, 2001 R. Byron Moore
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <acpi.h>
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#define _COMPONENT ACPI_HARDWARE
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MODULE_NAME ("hwacpi")
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/******************************************************************************
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*
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* FUNCTION: Acpi_hw_initialize
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*
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* PARAMETERS: None
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*
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* RETURN: Status
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*
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* DESCRIPTION: Initialize and validate various ACPI registers
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*
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******************************************************************************/
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ACPI_STATUS
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acpi_hw_initialize (
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void)
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{
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ACPI_STATUS status = AE_OK;
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u32 index;
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/* We must have the ACPI tables by the time we get here */
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if (!acpi_gbl_FADT) {
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acpi_gbl_restore_acpi_chipset = FALSE;
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return (AE_NO_ACPI_TABLES);
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}
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/* Must support *some* mode! */
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/*
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if (!(System_flags & SYS_MODES_MASK))
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{
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Restore_acpi_chipset = FALSE;
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return (AE_ERROR);
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}
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*/
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switch (acpi_gbl_system_flags & SYS_MODES_MASK) {
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/* Identify current ACPI/legacy mode */
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case (SYS_MODE_ACPI):
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acpi_gbl_original_mode = SYS_MODE_ACPI;
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break;
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case (SYS_MODE_LEGACY):
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acpi_gbl_original_mode = SYS_MODE_LEGACY;
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break;
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case (SYS_MODE_ACPI | SYS_MODE_LEGACY):
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if (acpi_hw_get_mode () == SYS_MODE_ACPI) {
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acpi_gbl_original_mode = SYS_MODE_ACPI;
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}
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else {
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acpi_gbl_original_mode = SYS_MODE_LEGACY;
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}
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break;
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}
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if (acpi_gbl_system_flags & SYS_MODE_ACPI) {
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/* Target system supports ACPI mode */
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/*
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* The purpose of this code is to save the initial state
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* of the ACPI event enable registers. An exit function will be
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* registered which will restore this state when the application
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* exits. The exit function will also clear all of the ACPI event
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* status bits prior to restoring the original mode.
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*
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* The location of the PM1a_evt_blk enable registers is defined as the
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* base of PM1a_evt_blk + DIV_2(PM1a_evt_blk_length). Since the spec further
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* fully defines the PM1a_evt_blk to be a total of 4 bytes, the offset
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* for the enable registers is always 2 from the base. It is hard
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* coded here. If this changes in the spec, this code will need to
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* be modified. The PM1b_evt_blk behaves as expected.
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*/
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acpi_gbl_pm1_enable_register_save = (u16) acpi_hw_register_read (ACPI_MTX_LOCK, PM1_EN);
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/*
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* The GPEs behave similarly, except that the length of the register
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* block is not fixed, so the buffer must be allocated with malloc
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*/
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if (ACPI_VALID_ADDRESS (acpi_gbl_FADT->Xgpe0blk.address) &&
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acpi_gbl_FADT->gpe0blk_len) {
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/* GPE0 specified in FADT */
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acpi_gbl_gpe0enable_register_save =
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acpi_cm_allocate (DIV_2 (acpi_gbl_FADT->gpe0blk_len));
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if (!acpi_gbl_gpe0enable_register_save) {
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return (AE_NO_MEMORY);
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}
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/* Save state of GPE0 enable bits */
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for (index = 0; index < DIV_2 (acpi_gbl_FADT->gpe0blk_len); index++) {
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acpi_gbl_gpe0enable_register_save[index] =
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(u8) acpi_hw_register_read (ACPI_MTX_LOCK, GPE0_EN_BLOCK | index);
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}
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}
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else {
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acpi_gbl_gpe0enable_register_save = NULL;
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}
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if (ACPI_VALID_ADDRESS (acpi_gbl_FADT->Xgpe1_blk.address) &&
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acpi_gbl_FADT->gpe1_blk_len) {
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/* GPE1 defined */
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acpi_gbl_gpe1_enable_register_save =
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acpi_cm_allocate (DIV_2 (acpi_gbl_FADT->gpe1_blk_len));
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if (!acpi_gbl_gpe1_enable_register_save) {
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return (AE_NO_MEMORY);
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}
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/* save state of GPE1 enable bits */
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for (index = 0; index < DIV_2 (acpi_gbl_FADT->gpe1_blk_len); index++) {
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acpi_gbl_gpe1_enable_register_save[index] =
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(u8) acpi_hw_register_read (ACPI_MTX_LOCK, GPE1_EN_BLOCK | index);
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}
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}
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else {
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acpi_gbl_gpe1_enable_register_save = NULL;
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}
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}
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return (status);
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}
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/******************************************************************************
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*
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* FUNCTION: Acpi_hw_set_mode
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*
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* PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
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*
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* RETURN: Status
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*
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* DESCRIPTION: Transitions the system into the requested mode or does nothing
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* if the system is already in that mode.
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*
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******************************************************************************/
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ACPI_STATUS
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acpi_hw_set_mode (
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u32 mode)
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{
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ACPI_STATUS status = AE_NO_HARDWARE_RESPONSE;
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if (mode == SYS_MODE_ACPI) {
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/* BIOS should have disabled ALL fixed and GP events */
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acpi_os_out8 (acpi_gbl_FADT->smi_cmd, acpi_gbl_FADT->acpi_enable);
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}
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else if (mode == SYS_MODE_LEGACY) {
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/*
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* BIOS should clear all fixed status bits and restore fixed event
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* enable bits to default
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*/
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acpi_os_out8 (acpi_gbl_FADT->smi_cmd, acpi_gbl_FADT->acpi_disable);
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}
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if (acpi_hw_get_mode () == mode) {
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status = AE_OK;
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}
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return (status);
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}
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/******************************************************************************
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*
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* FUNCTION: Acpi_hw_get_mode
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*
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* PARAMETERS: none
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*
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* RETURN: SYS_MODE_ACPI or SYS_MODE_LEGACY
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*
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* DESCRIPTION: Return current operating state of system. Determined by
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* querying the SCI_EN bit.
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*
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******************************************************************************/
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u32
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acpi_hw_get_mode (void)
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{
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if (acpi_hw_register_bit_access (ACPI_READ, ACPI_MTX_LOCK, SCI_EN)) {
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return (SYS_MODE_ACPI);
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}
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else {
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return (SYS_MODE_LEGACY);
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}
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}
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/******************************************************************************
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*
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* FUNCTION: Acpi_hw_get_mode_capabilities
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*
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* PARAMETERS: none
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*
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* RETURN: logical OR of SYS_MODE_ACPI and SYS_MODE_LEGACY determined at initial
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* system state.
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*
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* DESCRIPTION: Returns capablities of system
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*
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******************************************************************************/
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u32
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acpi_hw_get_mode_capabilities (void)
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{
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if (!(acpi_gbl_system_flags & SYS_MODES_MASK)) {
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if (acpi_hw_get_mode () == SYS_MODE_LEGACY) {
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/*
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* Assume that if this call is being made, Acpi_init has been called
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* and ACPI support has been established by the presence of the
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* tables. Therefore since we're in SYS_MODE_LEGACY, the system
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* must support both modes
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*/
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acpi_gbl_system_flags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY);
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}
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else {
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/* TBD: [Investigate] !!! this may be unsafe... */
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/*
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* system is is ACPI mode, so try to switch back to LEGACY to see if
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* it is supported
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*/
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acpi_hw_set_mode (SYS_MODE_LEGACY);
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if (acpi_hw_get_mode () == SYS_MODE_LEGACY) {
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/* Now in SYS_MODE_LEGACY, so both are supported */
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acpi_gbl_system_flags |= (SYS_MODE_ACPI | SYS_MODE_LEGACY);
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acpi_hw_set_mode (SYS_MODE_ACPI);
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}
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else {
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/* Still in SYS_MODE_ACPI so this must be an ACPI only system */
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acpi_gbl_system_flags |= SYS_MODE_ACPI;
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}
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}
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}
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return (acpi_gbl_system_flags & SYS_MODES_MASK);
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}
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