标题: SCI#、SMI#、PME#的作用，刚跟大师学习的，分享给大家。 [打印本页] 作者: 月饼 时间: 2016-12-12 11:32 标题: SCI#、SMI#、PME#的作用，刚跟大师学习的，分享给大家。 SMI#：System Management Interrupt，系统管理中断
An OS-transparent interrupt generated by interrupt events on legacy systems. By
contrast, on ACPI systems, interrupt events generate an OS-visible interrupt that is
shareable (edge-style interrupts will not work). Hardware platforms that want to
support both legacy operating systems and ACPI systems must support a way of remapping
the interrupt events between SMIs and SCIs when switching between ACPI
and legacy models.
SCI：beyond compare，系统控制中断
A system interrupt used by hardware to notify the OS of ACPI events. The SCI is an
active, low, shareable, level interrupt.
PME：PCI Express Native Power Management Events control
The firmware sets this bit to 1 to grant control over control over PCI Express native power
management event interrupts (PMEs). If firmware allows the OS control of this feature, then
in the context of the _OSC method it must ensure that all PMEs are routed to root port
interrupts as described in the PCI Express Base Specification. Additionally, after control is
transferred to the OS, firmware must not update the PME Status field in the Root Status
register or the PME Interrupt Enable field in the Root Control register. If control of this
feature was requested and denied or was not requested, firmware returns this bit set to 0.