Module acpi_pm 

ACPI Power Management for x86_64.

Implements ACPI sleep state transitions (S0-S5), SCI interrupt handling, and wake event processing. Reads PM1a/PM1b control and status registers from the FADT to orchestrate suspend (S3), hibernate (S4), and soft-off (S5).

CPU context save/restore for S3 resume uses inline assembly to capture and restore general-purpose registers, segment descriptors, and CR3.

Enums

AcpiSleepState

ACPI system sleep states.

AcpiWakeEvent

Types of wake events that can resume the system from sleep.

LidState

Laptop lid state.

Functions

acpi_handle_sci

Handle an ACPI SCI (System Control Interrupt).

acpi_hibernate_s4

Hibernate (ACPI S4).

acpi_pm_init

Initialize the ACPI power management subsystem.

acpi_shutdown_s5

Soft power off via ACPI S5.

acpi_suspend_s3

Suspend to RAM (ACPI S3).

current_state

Get the current ACPI sleep state.

is_initialized

Check if ACPI PM is initialized.

is_state_supported

Check if a given sleep state is supported.

last_wake_event

Get the last wake event type.

lid_state

Get the current lid state.

supported_states_string

Get supported sleep states as a formatted string.

wake_event_count

Get the total number of wake events since boot.