| Current Path : /boot/ |
| Current File : //boot/loader.4th |
\ Copyright (c) 1999 Daniel C. Sobral <dcs@FreeBSD.org>
\ Copyright (c) 2011-2015 Devin Teske <dteske@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: releng/12.1/stand/forth/loader.4th 332413 2018-04-11 18:02:13Z imp $
only forth definitions
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
include /boot/color.4th
include /boot/delay.4th
include /boot/check-password.4th
only forth definitions
: bootmsg ( -- )
loader_color? dup ( -- bool bool )
if 7 fg 4 bg then
." Booting..."
if me then
cr
;
: try-menu-unset
\ menu-unset may not be present
s" beastie_disable" getenv
dup -1 <> if
s" YES" compare-insensitive 0= if
exit
then
else
drop
then
s" menu-unset"
sfind if
execute
else
drop
then
s" menusets-unset"
sfind if
execute
else
drop
then
;
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 )
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
;
\ ***** boot-conf
\
\ Prepares to boot as specified by loaded configuration files.
: 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 previous
builtin: boot
builtin: boot-conf
only forth definitions also support-functions
\ ***** start
\
\ Initializes support.4th global variables, sets loader_conf_files,
\ processes conf files, and, if any one such file was successfully
\ read to the end, loads kernel and modules.
: start ( -- ) ( throws: abort & user-defined )
s" /boot/defaults/loader.conf" initialize
include_conf_files
include_nextboot_file
\ If the user defined a post-initialize hook, call it now
s" post-initialize" sfind if execute else drop then
\ Will *NOT* try to load kernel and modules if no configuration file
\ was successfully loaded!
any_conf_read? if
s" loader_delay" getenv -1 = if
load_xen_throw
load_kernel
load_modules
else
drop
." Loading Kernel and Modules (Ctrl-C to Abort)" cr
s" also support-functions" evaluate
s" set delay_command='load_xen_throw load_kernel load_modules'" evaluate
s" set delay_showdots" evaluate
delay_execute
then
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
\ If the user defined a post-initialize hook, call it now
s" post-initialize" sfind if execute else drop then
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 string=
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
\ show, enable, disable, toggle module loading. They all take module from
\ the next word
: set-module-flag ( module_addr val -- ) \ set and print flag
over module.flag !
dup module.name strtype
module.flag @ if ." will be loaded" else ." will not be loaded" then cr
;
: enable-module find-module ?dup if true set-module-flag then ;
: disable-module find-module ?dup if false set-module-flag then ;
: toggle-module find-module ?dup if dup module.flag @ 0= set-module-flag then ;
\ ***** show-module
\
\ Show loading information about a module.
: show-module ( <module> -- ) find-module ?dup if show-one-module then ;
\ 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 the ? command to print all the commands defined in
\ C, then list the ones we support here. Please note that this
\ doesn't use pager_* routines that the C implementation of ?
\ does, so these will always appear, even if you stop early
\ there. And they may cause the commands to scroll off the
\ screen if the number of commands modulus LINES is close
\ to LINEs....
: ?
['] ? 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" .?
s" try-include" s" try to load/interpret files" .?
;
: try-include ( -- ) \ see loader.4th(8)
['] include ( -- xt ) \ get the execution token of `include'
catch ( xt -- exception# | 0 ) if \ failed
LF parse ( c -- s-addr/u ) 2drop \ advance >in to EOL (drop data)
\ ... prevents words unused by `include' from being interpreted
then
; immediate \ interpret immediately for access to `source' (aka tib)
only forth definitions
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