What is the difference between SCI and SMI?
SCI (System Control Interrupt):
Purpose: SCI is used by hardware to notify the operating system (OS) of ACPI (Advanced Configuration and Power Interface) events.
Characteristics:
OS Interaction: The OS responds to SCI events to manage power states, system control, and other ACPI-related tasks.
Usage: Primarily used in ACPI-compliant systems.
Generation: Hardware generates SCI signals.
Software Generation: Typically not generated by software directly.

SMI (System Management Interrupt):
Purpose: SMI is an OS-transparent interrupt generated by interrupt events on legacy systems.
Characteristics:
Transparent to OS: The OS is unaware of SMI occurrences. It doesn’t directly handle SMIs.
Legacy Systems: Commonly found in older x86 systems.
Priority: SMI has a high priority and can interrupt normal execution.
In summary, SCI is related to ACPI events and is actively managed by the OS, while SMI operates at a lower level and is transparent to the OS.
Below is an instruction that describes a task. Write a response that appropriately completes the request. ### Instruction: What is the difference between SCI and SMI? ### Response: SCI (System Control Interrupt):
Purpose: SCI is used by hardware to notify the operating system (OS) of ACPI (Advanced Configuration and Power Interface) events.
Characteristics:
OS Interaction: The OS responds to SCI events to manage power states, system control, and other ACPI-related tasks.
Usage: Primarily used in ACPI-compliant systems.
Generation: Hardware generates SCI signals.
Software Generation: Typically not generated by software directly.

SMI (System Management Interrupt):
Purpose: SMI is an OS-transparent interrupt generated by interrupt events on legacy systems.
Characteristics:
Transparent to OS: The OS is unaware of SMI occurrences. It doesn’t directly handle SMIs.
Legacy Systems: Commonly found in older x86 systems.
Priority: SMI has a high priority and can interrupt normal execution.
In summary, SCI is related to ACPI events and is actively managed by the OS, while SMI operates at a lower level and is transparent to the OS. 