ACPI DEBUG方法

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获取ACPI TABLE的方法

1. 首先要安装acpidump和iasl命令

有的机器上需要安装pmtools才可以。

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$ sudo apt-get install acpidump 
$ sudo apt-get install iasl 
$ sudo apt-get install pmtools

2. 导出ACPI的数据。

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$ sudo cat /proc/acpi/dsdt > dstd.dat

或者

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$ sudo cat /sys/firmware/acpi/tables/DSDT > /tmp/dsdt.dat

如果找不到该文件可以使用下面的命令：

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$ sudo acpidump > acpi.dat

3. 分离各表格数据，会生成多个数据文件。

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$ acpixtract -a acpi.dat 
Acpi table [DSDT] - 41555 bytes written to DSDT.dat 
Acpi table [FACS] - 64 bytes written to FACS.dat 
Acpi table [FACP] - 116 bytes written to FACP.dat 
Acpi table [APIC] - 132 bytes written to APIC.dat 
Acpi table [ASF!] - 99 bytes written to ASF!.dat 
Acpi table [MCFG] - 60 bytes written to MCFG.dat 
Acpi table [TCPA] - 50 bytes written to TCPA.dat 
Acpi table [SLIC] - 374 bytes written to SLIC.dat 
Acpi table [HPET] - 56 bytes written to HPET.dat 
Acpi table [DMAR] - 456 bytes written to DMAR.dat 
Acpi table [RSDT] - 68 bytes written to RSDT.dat 
Acpi table [RSDP] - 20 bytes written to RSDP.dat

4. 反汇编DSDT.dat

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$ iasl -d DSDT.dat 
Intel ACPI Component Architecture 
AML Disassembler version 20100528 [Oct 15 2010] 
Copyright (c) 2000 - 2010 Intel Corporation 
Supports ACPI Specification Revision 4.0a 
Loading Acpi table from file DSDT.dat 
Acpi table [DSDT] successfully installed and loaded 
Pass 1 parse of [DSDT] 
Pass 2 parse of [DSDT] 
Parsing Deferred Opcodes (Methods/Buffers/Packages/Regions) 
...........................................................
...........................................................
...........................................................
...........................................................
...........................................................
...........................................................
...........................................................
...................................................... 
Parsing completed 
Disassembly completed, written to "DSDT.dsl"

5. 重新编译DSL

根据需要修改DSDT.dsl文件，然后重新编译该文件，会生成DSDT.aml和DSDT.hex两个文件。

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$ iasl -tc dsdt.dsl 
Intel ACPI Component Architecture 
ASL Optimizing Compiler version 20100528 [Oct 15 2010] 
Copyright (c) 2000 - 2010 Intel Corporation 
Supports ACPI Specification Revision 4.0a 
...................................................... 
ASL Input: DSDT.dsl - 8762 lines, 320704 bytes, 3778 keywords 
AML Output: DSDT.aml - 39328 bytes, 780 named objects, 2998 executable opcodes 
Compilation complete. 0 Errors, 41 Warnings, 0 Remarks, 988 Optimizations

6. 更新DSDT的方法。

  • 其一(没有测试过，不知道能否成功):
    使用新的dsdt.aml代替BIOS中的版本: 

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    cp /boot/initrd.img-2.6.20-16-generic /boot/initrd.img-2.6.20-16-generic-bak 
    sudo cp dsdt.aml /etc/initramfs-tools/DSDT.aml 
    sudo update-initramfs -u -k all

  • 其二（需要安装acpiexec，为找到）

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    iasl -sa DSDT.dsl # e.g. recompile a modified, disassembled DSDT for 
     initramfs inclusion (see later) 
    acpiexec DSDT.dat # parse, interpret and load a DSDT in userspace

  • 其三： 这个方法需要重新编译内核。
    首先将DSDT.hex文件复制到内核源码的include目录下。 

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    $ cp DSDT.hex $SRC/include/

    然后修改内核配置文件.config 

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    CONFIG_STANDALONE=n 
    CONFIG_ACPI_CUSTOM_DSDT=y 
    CONFIG_ACPI_CUSTOM_DSDT_FILE="DSDT.hex"

    重新编译，更新内核，然后启动，可以在dmesg中看到

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    [ 0.000000] ACPI: Override [DSDT- CDV-TPT], this is unsafe: tainting kernel 
    [ 0.000000] Disabling lock debugging due to kernel taint 
    [ 0.000000] ACPI: DSDT @ 0x7f378010 Table override, replaced with: 
    [ 0.000000] ACPI: DSDT c0f0f140 0703F (v02 Intel CDV-TPT 00000000 INTL 20091214)

    就说明DSDT已经被替换成修改过的了。

7. 打开CONFIG_ACPI_DEBUG

在DSDT中添加LOG。 首先应该打开CONFIG_ACPI_DEBUG=y。

acpi.debug_level= ACPI_LV_DEBUG_OBJECT， 
acpi.debug_layer= ACPI_TABLES | ACPI_NAMESPACE，

使用将想要的变量或者字符串赋值给Debug即可。

(Store (AAAA, Debug)