Re: ACPI panic on boot with new Lua loader and other minor issues

From: Warner Losh <imp_at_bsdimp.com>
Date: Mon, 19 Feb 2018 15:32:55 -0700
On Mon, Feb 19, 2018 at 2:57 PM, Devin Teske <dteske_at_freebsd.org> wrote:

>
>
> > On Feb 19, 2018, at 2:21 PM, Kyle Evans <kevans_at_freebsd.org> wrote:
> >
> > It seems that the Forth loader might be doing something sneaky and
> > replacing the standard common "boot" with a Forth boot that handles
> > this a lot better. CC'ing dteske_at_ so they can confirm.
>
> I can indeed confirm this as fact.
>
> Not able to help much because I am driving cross-country (San Francisco to
> Orlando) right now with the spouse and dog.
>
> We get back March 3rd, but I will be checking-in from time to time for
> sporadic responses during downtime.
>

The command in loader.4th is defined as:

: boot
  0= if ( interpreted ) get_arguments then

  \ Unload only if a path was passed
  dup if
    >r over r> swap
    c_at_ [char] - <> if
      0 1 unload drop
    else
      s" kernelname" getenv? if ( a kernel has been loaded )
        try-menu-unset
        bootmsg 1 boot exit
      then
      load_kernel_and_modules
      ?dup if exit then
      try-menu-unset
      bootmsg 0 1 boot exit
    then
  else
    s" kernelname" getenv? if ( a kernel has been loaded )
      try-menu-unset
      bootmsg 1 boot exit
    then
    load_kernel_and_modules
    ?dup if exit then
    try-menu-unset
    bootmsg 0 1 boot exit
  then
  load_kernel_and_modules
  ?dup 0= if bootmsg 0 1 boot then
;

The thing to know here is when you see 'boot' as part of above script, it's
calling the 'boot' cli command, not itself recursively.

I can help do more interpretation of the details if you need Kyle. Not sure
how much to spell out, but the brief pseudo code is:

If there were any arguments that didn't start with '-', unload.
  otherwise if kernelname is in in the environment, run the 'menu-unset'
forth word if it exists, print the boot message and boot.
  Otherwise load the kernel and modules, run the 'menu-unset' forth word
(if it exists), print the boot message and boot with kernelname
Otherwise load the kernel and modules, run the 'menu-unset' forth word (if
it exists), print the boot message and boot with kernelname
if all that fails, load the kernel and modules and if that works boot them.

Warner
Received on Mon Feb 19 2018 - 21:32:57 UTC

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