Tools

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$ acpidump -h
Usage: acpidump [options]
Options:
  -b                  Dump tables to binary files
  -h -?               This help message
  -o <File>           Redirect output to file
  -r <Address>        Dump tables from specified RSDP
  -s                  Print table summaries only
  -v                  Display version information
  -z                  Verbose mode

Table Options:
  -a <Address>        Get table via a physical address
  -c <on|off>         Turning on/off customized table dumping
  -f <BinaryFile>     Get table via a binary file
  -n <Signature>      Get table via a name/signature
  -x                  Do not use but dump XSDT
  -x -x               Do not use or dump XSDT

Invocation without parameters dumps all available tables
Multiple mixed instances of -a, -f, and -n are supported

Example

How to dump apic table

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$ acpidump -n APIC -b
$ ls
apic.dat
$ iasl -d apic.dat
Intel ACPI Component Architecture
ASL+ Optimizing Compiler version 20160527-64
Copyright (c) 2000 - 2016 Intel Corporation

Input file apic.dat, Length 0xB0 (176) bytes
ACPI: APIC 0x0000000000000000 0000B0 (v01 BOCHS  BXPCAPIC 00000001 BXPC 00000001)
Acpi Data Table [APIC] decoded
Formatted output:  apic.dsl - 7376 bytes
$ ls
apic.dat  apic.dsl
$ vim apic.dsl

apic.dsl文件格式为文本文件，可以直接查看其中的内容了。

acpidump source code

https://elixir.bootlin.com/linux/v3.14.34/source/tools/power/acpi/tools/acpidump/acpidump.c
https://elixir.bootlin.com/linux/v4.19/source/tools/power/acpi/tools/acpidump
研究acpidump的实现有助于理解acpi。

参考资料:

  1. Linux系统中ACPI Table读取与解析
  2. acpica.org