/*******************************************************************************
*
* FUNCTION: acpi_load_tables
*
* PARAMETERS: None
*
* RETURN: Status
*
* DESCRIPTION: Load the ACPI tables from the RSDT/XSDT
*
******************************************************************************/
acpi_status ACPI_INIT_FUNCTION acpi_load_tables(void)
{
acpi_status status;
ACPI_FUNCTION_TRACE(acpi_load_tables);
/*
* Install the default operation region handlers. These are the
* handlers that are defined by the ACPI specification to be
* "always accessible" -- namely, system_memory, system_IO, and
* PCI_Config. This also means that no _REG methods need to be
* run for these address spaces. We need to have these handlers
* installed before any AML code can be executed, especially any
* module-level code (11/2015).
* Note that we allow OSPMs to install their own region handlers
* between acpi_initialize_subsystem() and acpi_load_tables() to use
* their customized default region handlers.
*/
status = acpi_ev_install_region_handlers();
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"During Region initialization"));
return_ACPI_STATUS(status);
}
/* Load the namespace from the tables */
status = acpi_tb_load_namespace();
/* Don't let single failures abort the load */
if (status == AE_CTRL_TERMINATE) {
status = AE_OK;
}
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"While loading namespace from ACPI tables"));
}
if (acpi_gbl_execute_tables_as_methods) {
/*
* If the module-level code support is enabled, initialize the objects
* in the namespace that remain uninitialized. This runs the executable
* AML that may be part of the declaration of these name objects:
* operation_regions, buffer_fields, Buffers, and Packages.
*
* Note: The module-level code is optional at this time, but will
* become the default in the future.
*/
status = acpi_ns_initialize_objects();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
acpi_gbl_namespace_initialized = TRUE;
return_ACPI_STATUS(status);
}
/*******************************************************************************
*
* FUNCTION: acpi_enable_subsystem
*
* PARAMETERS: Flags - Init/enable Options
*
* RETURN: Status
*
* DESCRIPTION: Completes the subsystem initialization including hardware.
* Puts system into ACPI mode if it isn't already.
*
******************************************************************************/
acpi_status acpi_enable_subsystem(u32 flags)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(acpi_enable_subsystem);
/* Enable ACPI mode */
if (!(flags & ACPI_NO_ACPI_ENABLE)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Going into ACPI mode\n"));
acpi_gbl_original_mode = acpi_hw_get_mode();
status = acpi_enable();
if (ACPI_FAILURE(status)) {
ACPI_WARNING((AE_INFO, "AcpiEnable failed"));
return_ACPI_STATUS(status);
}
}
/*
* Obtain a permanent mapping for the FACS. This is required for the
* Global Lock and the Firmware Waking Vector
*/
status = acpi_tb_initialize_facs();
if (ACPI_FAILURE(status)) {
ACPI_WARNING((AE_INFO, "Could not map the FACS table"));
return_ACPI_STATUS(status);
}
/*
* Install the default op_region handlers. These are installed unless
* other handlers have already been installed via the
* install_address_space_handler interface.
*/
if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Installing default address space handlers\n"));
status = acpi_ev_install_region_handlers();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/*
* Initialize ACPI Event handling (Fixed and General Purpose)
*
* Note1: We must have the hardware and events initialized before we can
* execute any control methods safely. Any control method can require
* ACPI hardware support, so the hardware must be fully initialized before
* any method execution!
*
* Note2: Fixed events are initialized and enabled here. GPEs are
* initialized, but cannot be enabled until after the hardware is
* completely initialized (SCI and global_lock activated)
*/
if (!(flags & ACPI_NO_EVENT_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Initializing ACPI events\n"));
status = acpi_ev_initialize_events();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/*
* Install the SCI handler and Global Lock handler. This completes the
* hardware initialization.
*/
if (!(flags & ACPI_NO_HANDLER_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Installing SCI/GL handlers\n"));
status = acpi_ev_install_xrupt_handlers();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
return_ACPI_STATUS(status);
}
acpi_status acpi_enable_subsystem(u32 flags)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE("acpi_enable_subsystem");
/*
* We must initialize the hardware before we can enable ACPI.
* The values from the FADT are validated here.
*/
if (!(flags & ACPI_NO_HARDWARE_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Initializing ACPI hardware\n"));
status = acpi_hw_initialize();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/* Enable ACPI mode */
if (!(flags & ACPI_NO_ACPI_ENABLE)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Going into ACPI mode\n"));
acpi_gbl_original_mode = acpi_hw_get_mode();
status = acpi_enable();
if (ACPI_FAILURE(status)) {
ACPI_DEBUG_PRINT((ACPI_DB_WARN,
"acpi_enable failed.\n"));
return_ACPI_STATUS(status);
}
}
/*
* Install the default op_region handlers. These are installed unless
* other handlers have already been installed via the
* install_address_space_handler interface.
*/
if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Installing default address space handlers\n"));
status = acpi_ev_install_region_handlers();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/*
* Initialize ACPI Event handling (Fixed and General Purpose)
*
* NOTE: We must have the hardware AND events initialized before we can
* execute ANY control methods SAFELY. Any control method can require
* ACPI hardware support, so the hardware MUST be initialized before
* execution!
*/
if (!(flags & ACPI_NO_EVENT_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Initializing ACPI events\n"));
status = acpi_ev_initialize_events();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/* Install the SCI handler and Global Lock handler */
if (!(flags & ACPI_NO_HANDLER_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Installing SCI/GL handlers\n"));
status = acpi_ev_install_xrupt_handlers();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
return_ACPI_STATUS(status);
}
/**ltl
* 功能:使能ACPI子系统
* 参数:
* 返回值:
* 说明:
*/
acpi_status acpi_enable_subsystem(u32 flags)
{
acpi_status status = AE_OK;
ACPI_FUNCTION_TRACE(acpi_enable_subsystem);
/*
* We must initialize the hardware before we can enable ACPI.
* The values from the FADT are validated here.
*/
if (!(flags & ACPI_NO_HARDWARE_INIT)) { /* 初始化ACPI硬件模块 */
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Initializing ACPI hardware\n"));
status = acpi_hw_initialize();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/* Enable ACPI mode */
if (!(flags & ACPI_NO_ACPI_ENABLE)) { /* 使能ACPI硬件模块 */
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Going into ACPI mode\n"));
/* 返回值模式 */
acpi_gbl_original_mode = acpi_hw_get_mode();
/* 设置ACPI模式 */
status = acpi_enable();
if (ACPI_FAILURE(status)) {
ACPI_WARNING((AE_INFO, "AcpiEnable failed"));
return_ACPI_STATUS(status);
}
}
/*
* Install the default op_region handlers. These are installed unless
* other handlers have already been installed via the
* install_address_space_handler interface.
*/
if (!(flags & ACPI_NO_ADDRESS_SPACE_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Installing default address space handlers\n"));
/* 为四个地址空间设置默认处理句柄 */
status = acpi_ev_install_region_handlers();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/*
* Initialize ACPI Event handling (Fixed and General Purpose)
*
* Note1: We must have the hardware and events initialized before we can
* execute any control methods safely. Any control method can require
* ACPI hardware support, so the hardware must be fully initialized before
* any method execution!
*
* Note2: Fixed events are initialized and enabled here. GPEs are
* initialized, but cannot be enabled until after the hardware is
* completely initialized (SCI and global_lock activated)
*/
if (!(flags & ACPI_NO_EVENT_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Initializing ACPI events\n"));
/* 初始化ACPI事件(设置相关寄存器) */
status = acpi_ev_initialize_events();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/*
* Install the SCI handler and Global Lock handler. This completes the
* hardware initialization.
*/
if (!(flags & ACPI_NO_HANDLER_INIT)) {
ACPI_DEBUG_PRINT((ACPI_DB_EXEC,
"[Init] Installing SCI/GL handlers\n"));
/* 为ACPI模块安装中断处理函数 */
status = acpi_ev_install_xrupt_handlers();
if (ACPI_FAILURE(status)) {
return_ACPI_STATUS(status);
}
}
/*
* Complete the GPE initialization for the GPE blocks defined in the FADT
* (GPE block 0 and 1).
*
* Note1: This is where the _PRW methods are executed for the GPEs. These
* methods can only be executed after the SCI and Global Lock handlers are
* installed and initialized.
*
* Note2: Currently, there seems to be no need to run the _REG methods
* before execution of the _PRW methods and enabling of the GPEs.
*/
if (!(flags & ACPI_NO_EVENT_INIT)) {
status = acpi_ev_install_fadt_gpes(); /* 使能通用寄存器 */
if (ACPI_FAILURE(status)) {
return (status);
}
}
return_ACPI_STATUS(status);
}