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freebsd/sys/boot/forth/loader.4th
Gordon Tetlow 666df9ddf3 Add support for reading an additional loader configuration file. By default, 
this is called /boot/nextboot.conf. This file is required to have it's first
line be nextboot_enable="YES" for it to be read. Also, this file is
rewritten by the loader to nextboot_enable="NO"<space> after it is read.
This makes it so the file is read exactly once. Finally, the nextboot.conf
is removed shortly after the filesystems are mounted r/w.

Caution should be taken as you can shoot yourself in the foot. This is only
the loader piece. There will be a tool called nextboot(8) that will manage
the nextboot.conf file for you. It is coming shortly.

Reviewed by:	dcs
Approved by:	jake (mentor)
2002-05-24 02:28:58 +00:00

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\ Copyright (c) 1999 Daniel C. Sobral <dcs@freebsd.org>
\ All rights reserved.
\
\ Redistribution and use in source and binary forms, with or without
\ modification, are permitted provided that the following conditions
\ are met:
\ 1. Redistributions of source code must retain the above copyright
\ notice, this list of conditions and the following disclaimer.
\ 2. Redistributions in binary form must reproduce the above copyright
\ notice, this list of conditions and the following disclaimer in the
\ documentation and/or other materials provided with the distribution.
\
\ THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
\ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
\ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
\ ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
\ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
\ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
\ OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
\ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
\ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
\ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
\ SUCH DAMAGE.
\
\ $FreeBSD$
s" arch-alpha" environment? [if] [if]
s" loader_version" environment? [if]
12 < [if]
.( Loader version 1.2+ required) cr
abort
[then]
[else]
.( Could not get loader version!) cr
abort
[then]
[then] [then]
s" arch-i386" environment? [if] [if]
s" loader_version" environment? [if]
11 < [if]
.( Loader version 1.1+ required) cr
abort
[then]
[else]
.( Could not get loader version!) cr
abort
[then]
[then] [then]
256 dictthreshold ! \ 256 cells minimum free space
2048 dictincrease ! \ 2048 additional cells each time
include /boot/support.4th
\ ***** boot-conf
\
\ Prepares to boot as specified by loaded configuration files.
only forth also support-functions also builtins definitions
: boot
0= if ( interpreted ) get_arguments then
\ Unload only if a path was passed
dup if
>r over r> swap
c@ [char] - <> if
0 1 unload drop
else
s" kernelname" getenv? if ( a kernel has been loaded )
1 boot exit
then
load_kernel_and_modules
?dup if exit then
0 1 boot exit
then
else
s" kernelname" getenv? if ( a kernel has been loaded )
1 boot exit
then
load_kernel_and_modules
?dup if exit then
0 1 boot exit
then
load_kernel_and_modules
?dup 0= if 0 1 boot then
;
: boot-conf
0= if ( interpreted ) get_arguments then
0 1 unload drop
load_kernel_and_modules
?dup 0= if 0 1 autoboot then
;
also forth definitions also builtins
builtin: boot
builtin: boot-conf
only forth definitions also support-functions
\ ***** check-password
\
\ If a password was defined, execute autoboot and ask for
\ password if autoboot returns.
: check-password
password .addr @ if
0 autoboot
false >r
begin
bell emit bell emit
." Password: "
password .len @ read-password
dup password .len @ = if
2dup password .addr @ password .len @
compare 0= if r> drop true >r then
then
drop free drop
r@
until
r> drop
then
;
\ ***** start
\
\ Initializes support.4th global variables, sets loader_conf_files,
\ process conf files, and, if any one such file was succesfully
\ read to the end, load kernel and modules.
: start ( -- ) ( throws: abort & user-defined )
s" /boot/defaults/loader.conf" initialize
include_conf_files
include_nextboot_file
\ Will *NOT* try to load kernel and modules if no configuration file
\ was succesfully loaded!
any_conf_read? if
load_kernel
load_modules
then
;
\ ***** initialize
\
\ Overrides support.4th initialization word with one that does
\ everything start one does, short of loading the kernel and
\ modules. Returns a flag
: initialize ( -- flag )
s" /boot/defaults/loader.conf" initialize
include_conf_files
include_nextboot_file
any_conf_read?
;
\ ***** read-conf
\
\ Read a configuration file, whose name was specified on the command
\ line, if interpreted, or given on the stack, if compiled in.
: (read-conf) ( addr len -- )
conf_files .addr @ ?dup if free abort" Fatal error freeing memory" then
strdup conf_files .len ! conf_files .addr !
include_conf_files \ Will recurse on new loader_conf_files definitions
;
: read-conf ( <filename> | addr len -- ) ( throws: abort & user-defined )
state @ if
\ Compiling
postpone (read-conf)
else
\ Interpreting
bl parse (read-conf)
then
; immediate
\ ***** enable-module
\
\ Turn a module loading on.
: enable-module ( <module> -- )
bl parse module_options @ >r
begin
r@
while
2dup
r@ module.name dup .addr @ swap .len @
compare 0= if
2drop
r@ module.name dup .addr @ swap .len @ type
true r> module.flag !
." will be loaded." cr
exit
then
r> module.next @ >r
repeat
r> drop
type ." wasn't found." cr
;
\ ***** disable-module
\
\ Turn a module loading off.
: disable-module ( <module> -- )
bl parse module_options @ >r
begin
r@
while
2dup
r@ module.name dup .addr @ swap .len @
compare 0= if
2drop
r@ module.name dup .addr @ swap .len @ type
false r> module.flag !
." will not be loaded." cr
exit
then
r> module.next @ >r
repeat
r> drop
type ." wasn't found." cr
;
\ ***** toggle-module
\
\ Turn a module loading on/off.
: toggle-module ( <module> -- )
bl parse module_options @ >r
begin
r@
while
2dup
r@ module.name dup .addr @ swap .len @
compare 0= if
2drop
r@ module.name dup .addr @ swap .len @ type
r@ module.flag @ 0= dup r> module.flag !
if
." will be loaded." cr
else
." will not be loaded." cr
then
exit
then
r> module.next @ >r
repeat
r> drop
type ." wasn't found." cr
;
\ ***** show-module
\
\ Show loading information about a module.
: show-module ( <module> -- )
bl parse module_options @ >r
begin
r@
while
2dup
r@ module.name dup .addr @ swap .len @
compare 0= if
2drop
." Name: " r@ module.name dup .addr @ swap .len @ type cr
." Path: " r@ module.loadname dup .addr @ swap .len @ type cr
." Type: " r@ module.type dup .addr @ swap .len @ type cr
." Flags: " r@ module.args dup .addr @ swap .len @ type cr
." Before load: " r@ module.beforeload dup .addr @ swap .len @ type cr
." After load: " r@ module.afterload dup .addr @ swap .len @ type cr
." Error: " r@ module.loaderror dup .addr @ swap .len @ type cr
." Status: " r> module.flag @ if ." Load" else ." Don't load" then cr
exit
then
r> module.next @ >r
repeat
r> drop
type ." wasn't found." cr
;
\ Words to be used inside configuration files
: retry false ; \ For use in load error commands
: ignore true ; \ For use in load error commands
\ Return to strict forth vocabulary
: #type
over - >r
type
r> spaces
;
: .? 2 spaces 2swap 15 #type 2 spaces type cr ;
: ?
['] ? execute
s" boot-conf" s" load kernel and modules, then autoboot" .?
s" read-conf" s" read a configuration file" .?
s" enable-module" s" enable loading of a module" .?
s" disable-module" s" disable loading of a module" .?
s" toggle-module" s" toggle loading of a module" .?
s" show-module" s" show module load data" .?
;
only forth also
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