BIOS ACPI TABLE

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最新推荐文章于 2024-11-26 19:39:08 发布

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本文介绍了ACPI(高级配置与电源接口)中的关键表格，包括根系统描述表(RSDT)、固定ACPI描述表(FADT)、差异化系统描述表(DSDT)等。这些表格在操作系统启动过程中起到核心作用，提供了硬件配置和电源管理所需的数据。

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bibliography:

http://www.books24x7.com/book/id_6137/viewer.asp?bookid=6137&chunkid=0441939724

The Root System Description Table (RSDT) is the directory to all the other description tables, providing the operating system access to all the available ACPI data

RSDT is stored in the last 64KB below TOM.

Fixed ACPI Description Table (FADT)

Data in the FADT includes fixed-length entries describing the fixed ACPI features of the hardware

It also has the physical addresses of the Differentiated System Description Table (DSDT) and Firmware ACPI Control Structure (FACS)

Differentiated System Description Table (DSDT)

Differentiated Definition Block that contains implementation and configuration information beyond what's in the ACPI hardware registers the OSPM uses for power management, thermal management, or Plug and Play.

DSDT is a required table located at offset 0 in the segment from TOM-128K to TOM-64K

(TOM = top of memory)

RSDT--> FADT --> DSDT

SSDT—Secondary System Description Table

PSDT—Persistent System Description Table

The PSDT has been removed from the ACPI 2.0 specification

MADT—Multiple APIC Description Table

FACS—Firmware ACPI Control Structure

The FACS contains the system’s hardware signature at last boot, the firmware waking vector, and the global lock

When the system boots, OSPM uses the E820 BIOS call to obtain a system memory map

The BIOS should decide where the different memory structures belong and configure the E820 handler to return the appropriate values

For this example, the BIOS reports the system memory map by E820 as shown: Figure 1

The BIOS has set aside memory from the Top of Memory1 to Top of Memory2 as ACPI NVS Memory and Reserved Memory, and has marked both as reserved. A legacy operating system throws out the ACPI NVS Memory and marks this area as reserved memory, preventing the memory range from being allocated to any add-in device.

Operating System Loading

To see Figure 2