DefinitionBlock ("", "DSDT", 2,"","",0x0)
{
Name (OBJ1, 0x1234)
Name (OBJ2, "HELLO WORLD")
Method (TEST, 2)
{
printf ("Arg0 %o", Arg0)
printf ("Arg2 %o", Arg2)
}
}
To compile the dsdt.asl file , open a command line terminal and
enter the following command:
iasl dsdt.asl
This should result in output similar to the following:
Intel ACPI Component Architecture
ASL+ Optimizing Compiler/Disassembler version 20181031
Copyright (c) 2000 - 2018 Intel Corporation
ASL Input: dsdt.asl - 15 lines, 340 bytes, 2 keywords
AML Output: dsdt.aml - 62 bytes, 2 named objects, 0 executable
opcodes
This output indicates that compilation has completed successfully and the AML has been generated
in an output file called dsdt.aml. The AML inside this file defines an ACPI Namespace.
Typically, the ACPI Namespace is created inside the operating system kernel space. However, in
this tutorial we will demonstrate how to simulate creation of the ACPI Namespace in user space.
This is useful because it can help prototype ASL without having to constantly reflash new firmware
images, and it allows developers to interact with the ACPI Namespace with some limitations.
2.2.2 Introduction to Acpiexec
This user space simulation can be done through acpiexec , a userspace version of the AML
interpreter that simulates hardware accesses that happen while executing instructions. Execute the
following command in the terminal to load dsdt.aml:
acpiexec dsdt.aml
This results in the following output:
Input file dsdt.aml, Length 0x3E (62) bytes
ACPI: RSDP 0x000000000068D480 000024 (v02 Intel )
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