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NetBSD 6.1.5 - man page for amldb (netbsd section 8)

AMLDB(8)			   BSD System Manager's Manual				 AMLDB(8)

     amldb -- executing and debugging AML interpreter (with DSDT files)

     amldb [-dhst] dsdt_file ...

     The amldb utility parses the DSDT (Differentiated System Description Table) files, which
     usually are acquired from ACPI BIOS, and executes the sequence of ACPI Control Methods
     described in AML (ACPI Machine Language) with its AML interpreter.  The amldb utility also
     has a simple ACPI virtual machine.  During execution of the Control Methods each access to
     the region, such as SystemMemory, SystemIO, PCI_Config, does not affect the real hardware
     but only the virtual machine.  Because the sequence of virtual accesses is maintained in
     user space, AML interpreter developers need not worry about any effect on hardware when they
     analyze DSDT data files.  They can develop and debug the interpreter, even if the machine
     has no ACPI BIOS.

     The developer will need to acquire a DSDT data file from any machine with ACPI BIOS through
     acpidump(8).  The DSDT is a table, a part of the whole ACPI memory table located in some-
     where in the BIOS area (0xa0000 - 0x100000).  It includes such information as the detailed
     hardware information for PnP, and the set of procedures which perform power management from
     the OS.  The information is stored in AML format.

     The AML interpreter can execute any of the Control Methods specified by users.  When exe-
     cuted, it interprets the byte sequence in the Control Method of DSDT, and disassembles the
     opcodes that it recognizes into ASL (ACPI Source Language) format to be displayed.

     If it encounters one of more accesses to the region such as SystemMemory in executing the
     Control Methods, its ACPI Virtual Machine simulates the input/output operations to the
     resources in the region.  In writing to a certain region, the ACPI Virtual Machine prepares
     a piece of memory corresponding to its address, if necessary, and holds the specified value
     in the memory as the region contents.  In reading from a certain region, it fetches the
     value in the memory (region contents), prompts with it as the following:

	   DEBUG[read(0, 0x100b6813)&mask:0x1](default: 0x1 / 1) >>

     for users to have the opportunity to modify it, and hands it to the AML interpreter.  In
     case that there is no corresponding region in the AML Virtual Machine, the value zero is

     The interpreter continues to maintain all of the region contents until amldb terminates.
     You can specify their initial values with the file region.ini in the current directory.  If
     it is executed with -d option, it dumps the final status of all of its region contents to
     the file region.dmp when it terminates.  Each line of there files consists of the following
     fields, separated by tabs; region type, address, and value.  Region types are specified as
	   Value  Region type
	   0	  SystemMemory
	   1	  SystemIO
	   2	  PCI_Config
	   3	  EmbeddedControl
	   4	  SMBus

     Interactive commands are described below:

     s	     Single step: Performs single-step execution of the current Control Method.  If the
	     next instruction is an invocation of another Control Method, the step execution will
	     continue in the following Control Method.

     n	     Step program: Performs single-step execution of the current Control Method.  Even if
	     the next instruction is an invocation of another Control Method, the step execution
	     will not continue.

     c	     Continue program being debugged: Resumes execution of the AML interpreter.  Because
	     the current amldb has no way of breakpoint, this command might not so much useful.

     q	     Quit method execution: Terminates execution of the current Control Method.  If amldb
	     is not in execution, this command causes to input the next DSDT data file.  If there
	     are no next DSDT data files, it terminates amldb itself.

     t	     Show local name space tree and variables: Displays the structure of the ACPI names-
	     pace tree.  If amldb is in execution, this command displays the structure that
	     relates to the objects, arguments, and local variables below the scope of the cur-
	     rent Control Method.

     i	     Toggle region input prompt: Switches whether the prompt for modifying the value read
	     from the region contents be showed or not.  Default is On.

     o	     Toggle region output prompt: Switches whether the prompt for modifying the value to
	     be written to the region contents will be shown or not.  The default is Off.

     m	     Show memory management statistics: Displays the current statistics of the memory
	     management system on the AML interpreter.

     r method
	     Run specified method: Executes the specified Control Method.  If it requires one or
	     more arguments, a prompt such as the following appears;

	     Method: Arg 1 From 0x280626ce To 0x28062775
	       Enter argument values (ex. number 1 / string foo). 'q' to quit.
	       Arg0 ?

	     For each argument, a pair of type string and value delimited by one or more spaces
	     can be entered.  Now only number and string can be specified as the type string.  In
	     the current implementation, only the first character of the type string, such as n
	     or s, is identified.  For example, we can enter as follows:

	       Arg0 ? n 1

     f string
	     Find named objects from namespace: Lists the named objects that includes the speci-
	     fied string as the terminate elements searching from the ACPI namespace.  For the
	     namespace is expressed as the sequence of four-character elements, appropriate num-
	     ber of additional underscore ('_') characters are necessary for specifying objects
	     which have less than four character string.  Unless additional underscores speci-
	     fied, matching occurs as the beginning of word with the specified number of charac-

     h	     Show help messsage: Displays the command summary of amldb.

     Exactly one of the following options must be specified.  Otherwise, amldb shows its usage
     and terminates.

     -d      Dump the final status of all of the region contents in the ACPI Virtual Machine to
	     the file region.dmp.

     -h      Terminate with the usage of this command.

     -s      Display the statistics of the memory management system on the AML interpreter when
	     amldb terminates.

     -t      Display the tree structure of ACPI namespace after the DSDT data file is read.


     The following is an example including, invoking the amldb, searching _PRS (Possible Resource
     Settings) objects, and executing the _PTS (Prepare To Sleep) Control Method by the AML

	   % amldb p2b.dsdt.dat
	   Loading p2b.dsdt.dat...done
	   AML>f _PRS
	   AML>r _PTS
	   Method: Arg 1 From 0x2805f0a3 To 0x2805f0db
	     Enter argument values (ex. number 1 / string foo). 'q' to quit.
	     Arg0 ? n 5
	   ==== Running _PTS. ====
	   [\_PTS. START]
	   If(LNot(LEqual(Arg0, 0x5)))
	   If(LEqual(Arg0, 0x1))
	   If(LEqual(Arg0, 0x2))
	   Store(One, TO12)
	   [aml_region_write(1, 1, 0x1, 0xe42c, 0x18, 0x1)]
	   amldb: region.ini: No such file or directory
	   [write(1, 0x1, 0xe42f)]
	   [aml_region_read(1, 1, 0xe42c, 0x18, 0x1)]
	   DEBUG[read(1, 0xe42f)&mask:0x1](default: 0x1 / 1) >>
	   [read(1, 0xe42f)->0x1]
	   Or(Arg0, 0xf0, Local2)[Copy number 0xf5]
	   _PTS  Method: Arg 1 From 0x2805f0a3 To 0x2805f0db
	     Arg0    Num:0x5
	     Local2  Num:0xf5
	   Store(Local2, DBG1)
	   [aml_region_write(1, 1, 0xf5, 0x80, 0x0, 0x8)]
	   [write(1, 0xf5, 0x80)]
	   [aml_region_read(1, 1, 0x80, 0x0, 0x8)]
	   DEBUG[read(1, 0x80)&mask:0xf5](default: 0xf5 / 245) >>
	   [read(1, 0x80)->0xf5]
	   [\_PTS. END]
	   _PTS  Method: Arg 1 From 0x2805f0a3 To 0x2805f0db
	   NO object
	   ==== _PTS finished. ====

     acpi(4), acpidump(8)

     The amldb utility appeared in FreeBSD 5.0.

     Takanori Watanabe <takawata@FreeBSD.org>
     Mitsuru IWASAKI <iwasaki@FreeBSD.org>
     Yasuo YOKOYAMA <yokoyama@jp.FreeBSD.org>

     Some contributions made by
     Chitoshi Ohsawa <ohsawa@catv1.ccn-net.ne.jp>,
     Takayasu IWANASHI <takayasu@wendy.a.perfect-liberty.or.jp>,
     Norihiro KUMAGAI <kumagai@home.com>,
     Kenneth Ingham <ingham@I-pi.com>, and
     Michael Lucas <mwlucas@blackhelicopters.org>.

     The ACPI virtual machine does not completely simulate the behavior of a machine with an ACPI
     BIOS.  In the current implementation, the ACPI virtual machine only reads or writes the
     stored values by emulating access to regions such as SystemMemory.

     Because the AML interpreter interprets and disassembles simultaneously, it is impossible to
     implement such features as setting breakpoints with the specified line number in ASL.  Set-
     ting breakpoints at certain Control Methods, which is not very difficult, has not yet imple-
     mented because nobody has ever needed it.

BSD					 August 31, 2000				      BSD

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