![Bob Moore](/assets/img/avatar_default.png)
Removed a device initialization optimization introduced in 20051216 where the _STA method was not run unless an _INI was also present for the same device. This optimization could cause problems because it could allow _INI methods to be run within a not-present device subtree (If a not-present device had no _INI, _STA would not be run, the not-present status would not be discovered, and the children of the device would be incorrectly traversed.) Implemented a new _STA optimization where namespace subtrees that do not contain _INI are identified and ignored during device initialization. Selectively running _STA can significantly improve boot time on large machines (with assistance from Len Brown.) Implemented support for the device initialization case where the returned _STA flags indicate a device not-present but functioning. In this case, _INI is not run, but the device children are examined for presence, as per the ACPI specification. Implemented an additional change to the IndexField support in order to conform to MS behavior. The value written to the Index Register is not simply a byte offset, it is a byte offset in units of the access width of the parent Index Field. (Fiodor Suietov) Defined and deployed a new OSL interface, acpi_os_validate_address(). This interface is called during the creation of all AML operation regions, and allows the host OS to exert control over what addresses it will allow the AML code to access. Operation Regions whose addresses are disallowed will cause a runtime exception when they are actually accessed (will not affect or abort table loading.) Defined and deployed a new OSL interface, acpi_os_validate_interface(). This interface allows the host OS to match the various "optional" interface/behavior strings for the _OSI predefined control method as appropriate (with assistance from Bjorn Helgaas.) Restructured and corrected various problems in the exception handling code paths within DsCallControlMethod and DsTerminateControlMethod in dsmethod (with assistance from Takayoshi Kochi.) Modified the Linux source converter to ignore quoted string literals while converting identifiers from mixed to lower case. This will correct problems with the disassembler and other areas where such strings must not be modified. The ACPI_FUNCTION_* macros no longer require quotes around the function name. This allows the Linux source converter to convert the names, now that the converter ignores quoted strings. Signed-off-by: Bob Moore <robert.moore@intel.com> Signed-off-by: Len Brown <len.brown@intel.com>
223 lines
6.4 KiB
C
223 lines
6.4 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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*
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*****************************************************************************/
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/*
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* Copyright (C) 2000 - 2006, R. Byron Moore
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions, and the following disclaimer,
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* without modification.
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* 2. Redistributions in binary form must reproduce at minimum a disclaimer
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* substantially similar to the "NO WARRANTY" disclaimer below
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* ("Disclaimer") and any redistribution must be conditioned upon
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* including a substantially similar Disclaimer requirement for further
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* binary redistribution.
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* 3. Neither the names of the above-listed copyright holders nor the names
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* of any contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* NO WARRANTY
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGES.
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*/
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#include <acpi/acpi.h>
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#define _COMPONENT ACPI_HARDWARE
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ACPI_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 the various ACPI registers defined in
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* the FADT.
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*
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******************************************************************************/
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acpi_status acpi_hw_initialize(void)
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{
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acpi_status status;
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ACPI_FUNCTION_TRACE(hw_initialize);
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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_ERROR((AE_INFO, "No FADT is present"));
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return_ACPI_STATUS(AE_NO_ACPI_TABLES);
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}
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/* Sanity check the FADT for valid values */
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status = acpi_ut_validate_fadt();
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if (ACPI_FAILURE(status)) {
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return_ACPI_STATUS(status);
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}
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return_ACPI_STATUS(AE_OK);
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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.
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*
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******************************************************************************/
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acpi_status acpi_hw_set_mode(u32 mode)
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{
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acpi_status status;
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u32 retry;
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ACPI_FUNCTION_TRACE(hw_set_mode);
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/*
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* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
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* system does not support mode transition.
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*/
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if (!acpi_gbl_FADT->smi_cmd) {
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ACPI_ERROR((AE_INFO,
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"No SMI_CMD in FADT, mode transition failed"));
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return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
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}
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/*
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* ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
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* in FADT: If it is zero, enabling or disabling is not supported.
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* As old systems may have used zero for mode transition,
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* we make sure both the numbers are zero to determine these
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* transitions are not supported.
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*/
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if (!acpi_gbl_FADT->acpi_enable && !acpi_gbl_FADT->acpi_disable) {
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ACPI_ERROR((AE_INFO,
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"No ACPI mode transition supported in this system (enable/disable both zero)"));
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return_ACPI_STATUS(AE_OK);
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}
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switch (mode) {
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case ACPI_SYS_MODE_ACPI:
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/* BIOS should have disabled ALL fixed and GP events */
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status = acpi_os_write_port(acpi_gbl_FADT->smi_cmd,
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(u32) acpi_gbl_FADT->acpi_enable,
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8);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Attempting to enable ACPI mode\n"));
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break;
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case ACPI_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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status = acpi_os_write_port(acpi_gbl_FADT->smi_cmd,
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(u32) acpi_gbl_FADT->acpi_disable,
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8);
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Attempting to enable Legacy (non-ACPI) mode\n"));
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break;
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default:
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return_ACPI_STATUS(AE_BAD_PARAMETER);
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}
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if (ACPI_FAILURE(status)) {
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ACPI_EXCEPTION((AE_INFO, status,
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"Could not write ACPI mode change"));
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return_ACPI_STATUS(status);
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}
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/*
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* Some hardware takes a LONG time to switch modes. Give them 3 sec to
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* do so, but allow faster systems to proceed more quickly.
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*/
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retry = 3000;
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while (retry) {
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if (acpi_hw_get_mode() == mode) {
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ACPI_DEBUG_PRINT((ACPI_DB_INFO,
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"Mode %X successfully enabled\n",
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mode));
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return_ACPI_STATUS(AE_OK);
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}
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acpi_os_stall(1000);
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retry--;
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}
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ACPI_ERROR((AE_INFO, "Hardware did not change modes"));
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return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
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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 acpi_hw_get_mode(void)
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{
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acpi_status status;
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u32 value;
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ACPI_FUNCTION_TRACE(hw_get_mode);
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/*
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* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
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* system does not support mode transition.
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*/
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if (!acpi_gbl_FADT->smi_cmd) {
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return_UINT32(ACPI_SYS_MODE_ACPI);
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}
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status =
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acpi_get_register(ACPI_BITREG_SCI_ENABLE, &value, ACPI_MTX_LOCK);
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if (ACPI_FAILURE(status)) {
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return_UINT32(ACPI_SYS_MODE_LEGACY);
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}
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if (value) {
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return_UINT32(ACPI_SYS_MODE_ACPI);
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} else {
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return_UINT32(ACPI_SYS_MODE_LEGACY);
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}
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}
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