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);
}
}
/*
* Initialize ACPI Event handling
*
* 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 ();
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
/* Install the SCI handler, Global Lock handler, and GPE handlers */
if (!(flags & ACPI_NO_HANDLER_INIT)) {
ACPI_DEBUG_PRINT ((ACPI_DB_EXEC, "[Init] Installing SCI/GL/GPE handlers\n"));
status = acpi_ev_handler_initialize ();
if (ACPI_FAILURE (status)) {
return_ACPI_STATUS (status);
}
}
return_ACPI_STATUS (status);
}
acpi_status
acpi_hw_initialize (
void)
{
acpi_status status = AE_OK;
u32 index;
FUNCTION_TRACE ("Hw_initialize");
/* We must have the ACPI tables by the time we get here */
if (!acpi_gbl_FADT) {
acpi_gbl_restore_acpi_chipset = FALSE;
ACPI_DEBUG_PRINT ((ACPI_DB_ERROR, "No FADT!\n"));
return_ACPI_STATUS (AE_NO_ACPI_TABLES);
}
/* Identify current ACPI/legacy mode */
switch (acpi_gbl_system_flags & SYS_MODES_MASK) {
case (SYS_MODE_ACPI):
acpi_gbl_original_mode = SYS_MODE_ACPI;
ACPI_DEBUG_PRINT ((ACPI_DB_INFO, "System supports ACPI mode only.\n"));
break;
case (SYS_MODE_LEGACY):
acpi_gbl_original_mode = SYS_MODE_LEGACY;
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"Tables loaded from buffer, hardware assumed to support LEGACY mode only.\n"));
break;
case (SYS_MODE_ACPI | SYS_MODE_LEGACY):
if (acpi_hw_get_mode () == SYS_MODE_ACPI) {
acpi_gbl_original_mode = SYS_MODE_ACPI;
}
else {
acpi_gbl_original_mode = SYS_MODE_LEGACY;
}
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"System supports both ACPI and LEGACY modes.\n"));
ACPI_DEBUG_PRINT ((ACPI_DB_INFO,
"System is currently in %s mode.\n",
(acpi_gbl_original_mode == SYS_MODE_ACPI) ? "ACPI" : "LEGACY"));
break;
}
if (acpi_gbl_system_flags & SYS_MODE_ACPI) {
/* Target system supports ACPI mode */
/*
* The purpose of this code is to save the initial state
* of the ACPI event enable registers. An exit function will be
* registered which will restore this state when the application
* exits. The exit function will also clear all of the ACPI event
* status bits prior to restoring the original mode.
*
* The location of the PM1a_evt_blk enable registers is defined as the
* base of PM1a_evt_blk + DIV_2(PM1a_evt_blk_length). Since the spec further
* fully defines the PM1a_evt_blk to be a total of 4 bytes, the offset
* for the enable registers is always 2 from the base. It is hard
* coded here. If this changes in the spec, this code will need to
* be modified. The PM1b_evt_blk behaves as expected.
*/
acpi_gbl_pm1_enable_register_save = (u16) acpi_hw_register_read (
ACPI_MTX_LOCK, PM1_EN);
/*
* The GPEs behave similarly, except that the length of the register
* block is not fixed, so the buffer must be allocated with malloc
*/
if (ACPI_VALID_ADDRESS (acpi_gbl_FADT->Xgpe0blk.address) &&
acpi_gbl_FADT->gpe0blk_len) {
/* GPE0 specified in FADT */
acpi_gbl_gpe0enable_register_save = ACPI_MEM_ALLOCATE (
DIV_2 (acpi_gbl_FADT->gpe0blk_len));
if (!acpi_gbl_gpe0enable_register_save) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* Save state of GPE0 enable bits */
for (index = 0; index < DIV_2 (acpi_gbl_FADT->gpe0blk_len); index++) {
acpi_gbl_gpe0enable_register_save[index] =
(u8) acpi_hw_register_read (ACPI_MTX_LOCK, GPE0_EN_BLOCK | index);
}
}
else {
acpi_gbl_gpe0enable_register_save = NULL;
}
if (ACPI_VALID_ADDRESS (acpi_gbl_FADT->Xgpe1_blk.address) &&
acpi_gbl_FADT->gpe1_blk_len) {
/* GPE1 defined */
acpi_gbl_gpe1_enable_register_save = ACPI_MEM_ALLOCATE (
DIV_2 (acpi_gbl_FADT->gpe1_blk_len));
if (!acpi_gbl_gpe1_enable_register_save) {
return_ACPI_STATUS (AE_NO_MEMORY);
}
/* save state of GPE1 enable bits */
for (index = 0; index < DIV_2 (acpi_gbl_FADT->gpe1_blk_len); index++) {
acpi_gbl_gpe1_enable_register_save[index] =
(u8) acpi_hw_register_read (ACPI_MTX_LOCK, GPE1_EN_BLOCK | index);
}
}
else {
acpi_gbl_gpe1_enable_register_save = NULL;
}
}
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);
#if (!ACPI_REDUCED_HARDWARE)
/* 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);
}
#endif /* !ACPI_REDUCED_HARDWARE */
/*
* 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);
}
}
#if (!ACPI_REDUCED_HARDWARE)
/*
* 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) and the various
* initialization control methods are run (_REG, _STA, _INI) on the
* entire namespace.
*/
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);
}
}
#endif /* !ACPI_REDUCED_HARDWARE */
return_ACPI_STATUS(status);
}
/******************************************************************************
*
* FUNCTION: acpi_hw_set_mode
*
* PARAMETERS: Mode - SYS_MODE_ACPI or SYS_MODE_LEGACY
*
* RETURN: Status
*
* DESCRIPTION: Transitions the system into the requested mode.
*
******************************************************************************/
acpi_status acpi_hw_set_mode(u32 mode)
{
acpi_status status;
u32 retry;
ACPI_FUNCTION_TRACE(hw_set_mode);
/*
* ACPI 2.0 clarified that if SMI_CMD in FADT is zero,
* system does not support mode transition.
*/
if (!acpi_gbl_FADT.smi_command) {
ACPI_ERROR((AE_INFO,
"No SMI_CMD in FADT, mode transition failed"));
return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
}
/*
* ACPI 2.0 clarified the meaning of ACPI_ENABLE and ACPI_DISABLE
* in FADT: If it is zero, enabling or disabling is not supported.
* As old systems may have used zero for mode transition,
* we make sure both the numbers are zero to determine these
* transitions are not supported.
*/
if (!acpi_gbl_FADT.acpi_enable && !acpi_gbl_FADT.acpi_disable) {
ACPI_ERROR((AE_INFO,
"No ACPI mode transition supported in this system (enable/disable both zero)"));
return_ACPI_STATUS(AE_OK);
}
switch (mode) {
case ACPI_SYS_MODE_ACPI:
/* BIOS should have disabled ALL fixed and GP events */
status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
(u32) acpi_gbl_FADT.acpi_enable, 8);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Attempting to enable ACPI mode\n"));
break;
case ACPI_SYS_MODE_LEGACY:
/*
* BIOS should clear all fixed status bits and restore fixed event
* enable bits to default
*/
status = acpi_os_write_port(acpi_gbl_FADT.smi_command,
(u32) acpi_gbl_FADT.acpi_disable,
8);
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Attempting to enable Legacy (non-ACPI) mode\n"));
break;
default:
return_ACPI_STATUS(AE_BAD_PARAMETER);
}
if (ACPI_FAILURE(status)) {
ACPI_EXCEPTION((AE_INFO, status,
"Could not write ACPI mode change"));
return_ACPI_STATUS(status);
}
/*
* Some hardware takes a LONG time to switch modes. Give them 3 sec to
* do so, but allow faster systems to proceed more quickly.
*/
retry = 3000;
while (retry) {
if (acpi_hw_get_mode() == mode) {
ACPI_DEBUG_PRINT((ACPI_DB_INFO,
"Mode %X successfully enabled\n",
mode));
return_ACPI_STATUS(AE_OK);
}
acpi_os_stall(1000);
retry--;
}
ACPI_ERROR((AE_INFO, "Hardware did not change modes"));
return_ACPI_STATUS(AE_NO_HARDWARE_RESPONSE);
}
/**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);
}
acpi_status
acpi_ev_initialize (
void)
{
acpi_status status;
FUNCTION_TRACE ("Ev_initialize");
/* Make sure we have ACPI tables */
if (!acpi_gbl_DSDT) {
ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "No ACPI tables present!\n"));
return_ACPI_STATUS (AE_NO_ACPI_TABLES);
}
/* Make sure the BIOS supports ACPI mode */
if (SYS_MODE_LEGACY == acpi_hw_get_mode_capabilities()) {
ACPI_DEBUG_PRINT ((ACPI_DB_WARN, "ACPI Mode is not supported!\n"));
return_ACPI_STATUS (AE_ERROR);
}
acpi_gbl_original_mode = acpi_hw_get_mode();
/*
* Initialize the Fixed and General Purpose Acpi_events prior. This is
* done prior to enabling SCIs to prevent interrupts from occuring
* before handers are installed.
*/
status = acpi_ev_fixed_event_initialize ();
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to initialize fixed events.\n"));
return_ACPI_STATUS (status);
}
status = acpi_ev_gpe_initialize ();
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to initialize general purpose events.\n"));
return_ACPI_STATUS (status);
}
/* Install the SCI handler */
status = acpi_ev_install_sci_handler ();
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to install System Control Interrupt Handler\n"));
return_ACPI_STATUS (status);
}
/* Install handlers for control method GPE handlers (_Lxx, _Exx) */
status = acpi_ev_init_gpe_control_methods ();
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to initialize Gpe control methods\n"));
return_ACPI_STATUS (status);
}
/* Install the handler for the Global Lock */
status = acpi_ev_init_global_lock_handler ();
if (ACPI_FAILURE (status)) {
ACPI_DEBUG_PRINT ((ACPI_DB_FATAL, "Unable to initialize Global Lock handler\n"));
return_ACPI_STATUS (status);
}
return_ACPI_STATUS (status);
}