27 lines
1.2 KiB
Markdown
27 lines
1.2 KiB
Markdown
#### 简介
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*Advanced Configuration and Power Interface*，操作系统用它来查找和配置计算机硬件，让未使用的硬件休眠来进行电源管理，并进行状态监控。
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##### RSDP
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RSDP(Root System Description Pointer)是ACPI编程接口用到的数据结构。如下所示：
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```c
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struct acpi_table_rsdp {
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uint8_t signature[8]; /* "RSD PTR " */
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uint8_t checksum; /* first 20 bytes must add up to 0 */
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uint8_t oem_id[6];
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uint8_t revision; // ACPI的修订号，大的修定号向后兼容低的修订号。
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uint32_t rsdt_physical_address; /* 32-bit physical address of RSDT */
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uint32_t length; /* table length */
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uint64_t xsdt_physical_address; /* 64-bit physical address of XSDT */
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uint8_t extended_checksum; /* the entire table must add up to 0 */
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uint8_t reserved[3];
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} __packed;
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```
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RSDP有两个可能的位置：一是在EBDA(Extended BIOS Data Area)的头1KB，EBDA是16位的实模式段，位于0x40e；一是在内存区域从0x000e0000到0x000fffff。
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RSDT(Root System Description Table)是ACPI编程接口用到的数据结构。
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XSDT(eXtended System Descriptor Table)是RSDT的64位版本。 |