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76 lines
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.. SPDX-License-Identifier: GPL-2.0
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.. include:: <isonum.txt>
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================
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The AML Debugger
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================
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:Copyright: |copy| 2016, Intel Corporation
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:Author: Lv Zheng <lv.zheng@intel.com>
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This document describes the usage of the AML debugger embedded in the Linux
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kernel.
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1. Build the debugger
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=====================
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The following kernel configuration items are required to enable the AML
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debugger interface from the Linux kernel::
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CONFIG_ACPI_DEBUGGER=y
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CONFIG_ACPI_DEBUGGER_USER=m
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The userspace utilities can be built from the kernel source tree using
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the following commands::
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$ cd tools
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$ make acpi
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The resultant userspace tool binary is then located at::
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tools/power/acpi/acpidbg
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It can be installed to system directories by running "make install" (as a
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sufficiently privileged user).
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2. Start the userspace debugger interface
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=========================================
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After booting the kernel with the debugger built-in, the debugger can be
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started by using the following commands::
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# mount -t debugfs none /sys/kernel/debug
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# modprobe acpi_dbg
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# tools/power/acpi/acpidbg
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That spawns the interactive AML debugger environment where you can execute
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debugger commands.
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The commands are documented in the "ACPICA Overview and Programmer Reference"
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that can be downloaded from
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https://acpica.org/documentation
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The detailed debugger commands reference is located in Chapter 12 "ACPICA
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Debugger Reference". The "help" command can be used for a quick reference.
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3. Stop the userspace debugger interface
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========================================
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The interactive debugger interface can be closed by pressing Ctrl+C or using
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the "quit" or "exit" commands. When finished, unload the module with::
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# rmmod acpi_dbg
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The module unloading may fail if there is an acpidbg instance running.
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4. Run the debugger in a script
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===============================
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It may be useful to run the AML debugger in a test script. "acpidbg" supports
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this in a special "batch" mode. For example, the following command outputs
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the entire ACPI namespace::
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# acpidbg -b "namespace"
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