VolksForth/8086/pc-baremetal/kernel.fth

1609 lines
50 KiB
Forth

( ----- 000 )
\ #### volksFORTH #### cas 11apr21
volksFORTH designed and developed by
the volksFORTH team
see https://volksforth.sf.net
https://github.com/forth-ev/VolksForth
for documentation, updated versions and development
information
( ----- 001 )
\ MS-DOS volksForth Load Screen ks cas 18jul20
warning off \ disable warnings during compilation
Onlyforth \needs Transient include meta.fb
2 loadfrom META.fb
new FORTH.COM Onlyforth Target definitions
4 &111 thru \ Standard 8088-System
warning on
flush \ close FORTH.COM
cr .( new kernel as "FORTH.COM" written) cr bell
( ----- 002 )
\\ The use of the 8088/86 register ks 27 oct 86
The assembler uses forth style names for the register
Mapping of Forth Registernames to INTEL Register Names:
A <=> AX A- <=> AL A+ <=> AH
C <=> CX C- <=> CL C+ <=> CH
Register A and C are free to use
D <=> DX D- <=> DL D+ <=> DH
the Top of (Data-) Stack (TOS)
R <=> BX R- <=> RL R+ <=> RH
the Return_stack_pointer
( ----- 003 )
\\ The use of the 8088/86 register ks 27 oct 86
U <=> BP User_area_pointer
S <=> SP Daten_stack_pointer
I <=> SI Instruction_pointer
W <=> DI Word_pointer, free for general use
D: <=> DS E: <=> ES S: <=> SS C: <=> CS
All segment registers are set to the value of code-segment
C: and must be restored to the same if changed in the code
( ----- 004 )
\ FORTH Preamble and ID ks 11 m„r 89
Assembler
nop 5555 # jmp here 2- >label >cold
nop 5555 # jmp here 2- >label >restart
Create origin here origin! here $100 0 fill
\ Coldstart values for user variables
$E9 int end-code -4 , $FC allot
\ this is the multitasker initialization in the user area
| Create logo ," volksFORTH-83 Version 3.9.3"
( ----- 005 )
\ Next ks 27 oct 86
Variable next-link 0 next-link !
Host Forth Assembler also definitions
: Next lods A W xchg W ) jmp
there tnext-link @ T , H tnext-link ! ;
\ Next is in-line code. All "nexts" are linked into a
\ list with the anchor NEXT-LINK for the debugger
: u' ( -- offset ) T ' 2+ c@ H ;
Target
( ----- 006 )
\ recover ;c: noop ks 27 oct 86
Create recover Assembler
R dec R dec I R ) mov I pop Next
end-code
Host Forth Assembler also definitions
: ;c: 0 T recover # call ] end-code H ;
Target
| Code di cli Next end-code
| Code ei sti here Next end-code
Code noop here 2- ! end-code
( ----- 007 )
\ User variables ks 16 sep 88
8 uallot drop \ Space for the multitasker
\ Fields: entry link spare SPsave
\ Length compatible to 68000, 6502 and 8080 volksFORTH
User s0
User r0
User dp
User offset 0 offset !
User base &10 base !
User output
User input
User errorhandler \ pointer for Abort" -code
User aborted \ code address of latest error
User voc-link
User file-link ( TODO: Why is UDP a user variable? )
User udp \ points to next free addr in User_area
( ----- 008 )
\ manipulate system pointers ks 03 aug 87
Code sp@ ( -- addr ) D push S D mov Next end-code
Code sp! ( addr -- ) D S mov D pop Next end-code
Code up@ ( -- addr ) D push U D mov Next end-code
Code up! ( addr -- ) D U mov D pop Next end-code
Code ds@ ( -- addr ) D push D: D mov Next end-code
$10 Constant b/seg \ bytes per segment
( ----- 009 )
\ manipulate returnstack ks 27 oct 86
Code rp@ ( -- addr ) D push R D mov Next end-code
Code rp! ( addr -- ) D R mov D pop Next end-code
Code >r ( 16b -- ) R dec R dec D R ) mov D pop Next
end-code restrict
Code r> ( -- 16b ) D push R ) D mov R inc R inc Next
end-code restrict
( ----- 010 )
\ r@ rdrop exit unnest ?exit ks 27 oct 86
Code r@ ( -- 16b ) D push R ) D mov Next end-code
Code rdrop R inc R inc Next end-code restrict
Code exit
Label >exit R ) I mov R inc R inc Next end-code
Code unnest >exit here 2- ! end-code
Code ?exit ( flag -- )
D D or D pop >exit 0= ?] [[ Next end-code
Code 0=exit ( flag -- )
D D or D pop >exit 0= not ?] ]] end-code
\ : ?exit ( flag -- ) IF rdrop THEN ;
( ----- 011 )
\ execute perform ks 27 oct 86
Code execute ( acf -- ) D W mov D pop W ) jmp end-code
Code perform ( addr -- ) D W mov D pop W ) W mov W ) jmp
end-code
\ : perform ( addr -- ) @ execute ;
( ----- 012 )
\ c@ c! ctoggle ks 27 oct 86
Code c@ ( addr -- 8b )
D W mov W ) D- mov 0 # D+ mov Next end-code
Code c! ( 16b addr -- )
D W mov A pop A- W ) mov D pop Next end-code
Code ctoggle ( 8b addr -- )
D W mov A pop A- W ) xor D pop Next end-code
\ : ctoggle ( 8b addr -- ) under c@ xor swap c! ;
Code flip ( 16b1 -- 16b2 ) D- D+ xchg Next end-code
( ----- 013 )
\ @ ! 2@ 2! ks 27 oct 86
Code @ ( addr -- 16b ) D W mov W ) D mov Next end-code
Code ! ( 16b addr -- ) D W mov W ) pop D pop Next
end-code
: 2@ ( addr -- 32b ) dup 2+ @ swap @ ;
: 2! ( 32b addr -- ) under ! 2+ ! ;
( ----- 014 )
\ +! drop swap ks 27 oct 86
Code +! ( 16b addr -- )
D W mov A pop A W ) add D pop Next end-code
\ : +! ( n addr -- ) under @ + swap ! ;
Code drop ( 16b -- ) D pop Next end-code
Code swap ( 16b1 16b2 -- 16b2 16b1 )
A pop D push A D xchg Next end-code
( ----- 015 )
\ dup ?dup ks 27 oct 86
Code dup ( 16b -- 16b 16b ) D push Next end-code
\ : dup ( 16b -- 16b 16b ) sp@ @ ;
Code ?dup ( 16b -- 16b 16b / false )
D D or 0= not ?[ D push ]? Next end-code
\ : ?dup ( 16b -- 16b 16b / false) dup 0=exit dup ;
( ----- 016 )
\ over rot nip under ks 27 oct 86
Code over ( 16b1 16b2 -- 16b1 16b2 16b1 )
A D xchg D pop D push A push Next end-code
\ : over >r dup r> swap ;
Code rot ( 16b1 16b2 16b3 -- 16b2 16b3 16b1 )
A D xchg C pop D pop C push A push Next end-code
\ : rot >r swap r> swap ;
Code nip ( 16b1 16b2 -- 16b2 ) S inc S inc Next end-code
\ : nip swap drop ;
Code under ( 16b1 16b2 -- 16b2 16b1 16b2 )
A pop D push A push Next end-code
\ : under swap over ;
( ----- 017 )
\ -rot pick ks 27 oct 86
Code -rot ( 16b1 16b2 16b3 -- 16b3 16b1 16b2 )
A D xchg D pop C pop A push C push Next end-code
\ : -rot ( 16b1 16b2 16b3 -- 16b3 16b1 16b2 ) rot rot ;
Code pick ( n -- 16b.n )
D sal D W mov S W add W ) D mov Next end-code
\ : pick ( n -- 16b.n ) 1+ 2* sp@ + @ ;
( ----- 018 )
\ roll -roll ks 27 oct 86
Code roll ( n -- )
A I xchg D sal D C mov D I mov S I add
I ) D mov I W mov I dec W inc std
rep byte movs cld A I xchg S inc S inc Next
end-code
\ : roll ( n -- )
\ dup >r pick sp@ dup 2+ r> 1+ 2* cmove> drop ;
Code -roll ( n -- ) A I xchg D sal D C mov
S W mov D pop S I mov S dec S dec
rep byte movs D W ) mov D pop A I xchg Next
end-code
\ : -roll ( n -- ) >r dup sp@ dup 2+
\ dup 2+ swap r@ 2* cmove r> 1+ 2* + ! ;
( ----- 019 )
\ 2swap 2drop 2dup 2over ks 27 oct 86
Code 2swap ( 32b1 32b2 -- 32b2 32b1 ) C pop A pop W pop
C push D push W push A D xchg Next end-code
\ : 2swap ( 32b1 32b2 -- 32b2 32b1 ) rot >r rot r> ;
Code 2drop ( 32b -- ) S inc S inc D pop Next end-code
\ : 2drop ( 32b -- ) drop drop ;
Code 2dup ( 32b -- 32b 32b )
S W mov D push W ) push Next end-code
\ : 2dup ( 32b -- 32b 32b ) over over ;
Code 2over ( 1 2 x x -- 1 2 x x 1 2 )
D push S W mov 6 W D) push 4 W D) D mov Next
end-code
\ : 2over ( 1 2 x x -- 1 2 x x 1 2 ) 3 pick 3 pick ;
( ----- 020 )
\ and or xor not ks 27 oct 86
Code not ( 16b1 -- 16b2 ) D com Next end-code
Code and ( 16b1 16b2 -- 16b3 )
A pop A D and Next end-code
Code or ( 16b1 16b2 -- 16b3 )
A pop A D or Next end-code
\ : or ( 16b1 16b2 -- 16b3 ) not swap not and not ;
Code xor ( 16b1 16b2 -- 16b3 )
A pop A D xor Next end-code
( ----- 021 )
\ + - negate ks 27 oct 86
Code + ( n1 n2 -- n3 ) A pop A D add Next end-code
Code negate ( n1 -- n2 ) D neg Next end-code
\ : negate ( n1 -- n2 ) not 1+ ;
Code - ( n1 n2 -- n3 )
A pop D A sub A D xchg Next end-code
\ : - ( n1 n2 -- n3 ) negate + ;
( ----- 022 )
\ dnegate d+ ks 27 oct 86
Code dnegate ( d1 -- -d1 ) D com A pop A neg
CS not ?[ D inc ]? A push Next end-code
Code d+ ( d1 d2 -- d3 ) A pop C pop W pop
W A add A push C D adc Next end-code
( ----- 023 )
\ 1+ 2+ 3+ 4+ 6+ 1- 2- 4- ks 27 oct 86
Code 1+ ( n1 -- n2 ) [[ D inc Next
Code 2+ ( n1 -- n2 ) [[ D inc swap ]]
Code 3+ ( n1 -- n2 ) [[ D inc swap ]]
Code 4+ ( n1 -- n2 ) [[ D inc swap ]]
| Code 6+ ( n1 -- n2 ) D inc D inc ]] end-code
Code 1- ( n1 -- n2 ) [[ D dec Next
Code 2- ( n1 -- n2 ) [[ D dec swap ]]
Code 4- ( n1 -- n2 ) D dec D dec ]] end-code
( ----- 024 )
\ number Constants ks 30 jan 88
-1 Constant true 0 Constant false
0 ( -- 0 ) Constant 0
1 ( -- 1 ) Constant 1
2 ( -- 2 ) Constant 2
3 ( -- 3 ) Constant 3
4 ( -- 4 ) Constant 4
-1 ( -- -1 ) Constant -1
Code on ( addr -- ) -1 # A mov
[[ D W mov A W ) mov D pop Next
Code off ( addr -- ) 0 # A mov ]] end-code
\ : on ( addr -- ) true swap ! ;
\ : off ( addr -- ) false swap ! ;
( ----- 025 )
\ words for number literals ks 27 oct 86
Code lit ( -- 16b ) D push I ) D mov I inc
[[ I inc Next end-code restrict
Code clit ( -- 8b )
D push I ) D- mov 0 # D+ mov ]] end-code restrict
: Literal ( 16b -- )
dup $FF00 and IF compile lit , exit THEN
compile clit c, ; immediate restrict
( ----- 026 )
\ comparision code words ks 27 oct 86
Code 0= ( 16b -- flag )
D D or 0 # D mov 0= ?[ D dec ]? Next end-code
Code 0<> ( n -- flag )
D D or 0 # D mov 0= not ?[ D dec ]? Next end-code
\ : 0<> ( n -- flag ) 0= not ;
Code u< ( u1 u2 -- flag ) A pop
[[ D A sub 0 # D mov CS ?[ D dec ]? Next end-code
Code u> ( u1 u2 -- flag ) A D xchg D pop ]] end-code
\ : u> ( u1 u2 -- flag ) swap u< ;
( ----- 027 )
\ comparision words ks 13 sep 88
Code < ( n1 n2 -- flag ) A pop
[[ [[ D A sub 0 # D mov < ?[ D dec ]? Next end-code
Code > ( n1 n2 -- flag ) A D xchg D pop ]] end-code
Code 0> ( n -- flag ) A A xor ]] end-code
\ : < ( n1 n2 -- flag )
\ 2dup xor 0< IF drop 0< exit THEN - 0< ;
\ : > ( n1 n2 -- flag ) swap < ;
\ : 0> ( n -- flag ) negate 0< ;
Code 0< ( n1 n2 -- flag )
D D or 0 # D mov 0< ?[ D dec ]? Next end-code
\ : 0< ( n1 -- flag ) 8000 and 0<> ;
( ----- 028 )
\ comparision words ks 27 oct 86
Code = ( n1 n2 -- flag ) A pop A D cmp
0 # D mov 0= ?[ D dec ]? Next end-code
\ : = ( n1 n2 -- flag ) - 0= ;
Code uwithin ( u1 [low high[ -- flag ) A pop C pop
A C cmp CS ?[ [[ swap 0 # D mov Next ]?
D C cmp CS ?] -1 # D mov Next end-code
\ : uwithin ( u1 [low up[ -- f ) over - -rot - u> ;
Code case? ( 16b1 16b2 -- 16b1 ff / tf ) A pop A D sub
0= ?[ D dec ][ A push D D xor ]? Next end-code
\ : case? ( 16b1 16b2 -- 16b1 false / true )
\ over = dup 0=exit nip ;
( ----- 029 )
\ double number comparisons ks 27 oct 86
Code d0= ( d - f) A pop A D or
0= not ?[ 1 # D mov ]? D dec Next end-code
\ : d0= ( d -- flag ) or 0= ;
: d= ( d1 d2 -- flag ) dnegate d+ d0= ;
Code d< ( d1 d2 -- flag ) C pop A pop
D A sub A pop -1 # D mov < ?[ [[ swap Next ]?
0= ?[ C A sub CS ?[ D dec ]? ]? D inc ]] end-code
\ : d< ( d1 d2 -- flag )
\ rot 2dup - IF > nip nip exit THEN 2drop u< ;
( ----- 030 )
\ min max umax umin abs dabs extend ks 27 oct 86
Code min ( n1 n2 -- n3 ) A pop A D sub < ?[ D A add ]?
[[ [[ [[ A D xchg Next end-code
Code max ( n1 n2 -- n3 )
A pop A D sub dup < not ?] D A add ]] end-code
Code umin ( u1 u2 -- u3 )
A pop A D sub dup CS ?] D A add ]] end-code
Code umax ( u1 u2 -- u3 )
A pop A D sub dup CS not ?] D A add ]] end-code
Code extend ( n -- d )
A D xchg cwd A push Next end-code
Code abs ( n -- u ) D D or 0< ?[ D neg ]? Next end-code
: dabs ( d -- ud ) extend 0=exit dnegate ;
( ----- 031 )
\\ min max umax umin extend 10Mar8
| : minimax ( n1 n2 flag -- n3 ) rdrop IF swap THEN drop ;
: min ( n1 n2 -- n3 ) 2dup > minimax ;
: max ( n1 n2 -- n3 ) 2dup < minimax ;
: umax ( u1 u2 -- u3 ) 2dup u< minimax ;
: umin ( u1 u2 -- u3 ) 2dup u> minimax ;
: extend ( n -- d ) dup 0< ;
: dabs ( d -- ud ) extend IF dnegate THEN ;
: abs ( n -- u) extend IF negate THEN ;
( ----- 032 )
\ (do (?do endloop bounds ks 30 jan 88
Code (do ( limit start -- ) A pop
[[ $80 # A+ xor R dec R dec I inc I inc
I R ) mov R dec R dec A R ) mov R dec R dec
A D sub D R ) mov D pop Next end-code restrict
Code (?do ( limit start -- ) A pop A D cmp 0= ?]
I ) I add D pop Next end-code restrict
Code endloop 6 # R add Next end-code restrict
Code bounds ( start count -- limit start )
A pop A D xchg D A add A push Next end-code
\ : bounds ( start count -- limit start ) over + swap ;
( ----- 033 )
\ (loop (+loop ks 27 oct 86
Code (loop R ) word inc
[[ OS not ?[ 4 R D) I mov ]? Next end-code restrict
Code (+loop D R ) add D pop ]] end-code restrict
\\
| : dodo rdrop r> 2+ dup >r rot >r swap >r >r ;
\ dodo puts "index | limit | adr.of.DO" on return-stack
: (do ( limit start -- ) over - dodo ; restrict
: (?do ( limit start -- ) over - ?dup IF dodo THEN
r> dup @ + >r drop ; restrict
( ----- 034 )
\ loop indices ks 27 oct 86
Code I ( -- n ) D push R ) D mov 2 R D) D add Next
end-code
\ : I ( -- n ) r> r> dup r@ + -rot >r >r ;
Code J ( -- n ) D push 6 R D) D mov 8 R D) D add Next
end-code
( ----- 035 )
\ branch ?branch ks 27 oct 86
Code branch
[[ I ) I add Next end-code restrict
\ : branch r> dup @ + >r ;
Code ?branch D D or D pop 0= not ?]
I inc I inc Next end-code restrict
( ----- 036 )
\ resolve loops and branches ks 02 okt 87
: >mark ( -- addr ) here 0 , ;
: >resolve ( addr -- ) here over - swap ! ;
: <mark ( -- addr ) here ;
: <resolve ( addr -- ) here - , ;
: ?pairs ( n1 n2 -- ) - Abort" unstructured" ;
( ----- 037 )
\ Branching ks 17 jul 87
: IF compile ?branch >mark 1 ; immediate restrict
: THEN abs 1 ?pairs >resolve ; immediate restrict
: ELSE 1 ?pairs compile branch >mark
swap >resolve -1 ; immediate restrict
: BEGIN <mark 2 ; immediate restrict
: WHILE 2 ?pairs 2 compile ?branch
>mark -2 2swap ; immediate restrict
| : (repeat 2 ?pairs <resolve
BEGIN dup -2 = WHILE drop >resolve REPEAT ;
: REPEAT compile branch (repeat ; immediate restrict
: UNTIL compile ?branch (repeat ; immediate restrict
( ----- 038 )
\ Loops ks 27 oct 86
: DO compile (do >mark 3 ; immediate restrict
: ?DO compile (?do >mark 3 ; immediate restrict
: LOOP 3 ?pairs compile (loop
compile endloop >resolve ; immediate restrict
: +LOOP 3 ?pairs compile (+loop
compile endloop >resolve ; immediate restrict
Code LEAVE 6 # R add -2 R D) I mov
I dec I dec I ) I add Next end-code restrict
\ : LEAVE endloop r> 2- dup @ + >r ; restrict
\ Returnstack: | calladr | index | limit | adr of DO |
( ----- 039 )
\ um* m* * ks 29 jul 87
Code um* ( u1 u2 -- ud3 )
A D xchg C pop C mul A push Next end-code
Code m* ( n1 n2 -- d3 )
A D xchg C pop C imul A push Next end-code
\ : m* ( n1 n2 -- d ) dup 0< dup >r IF negate THEN swap
\ dup 0< IF negate r> not >r THEN um* r> 0=exit dnegate ;
: * ( n1 n2 - prod ) um* drop ;
Code 2* ( u -- 2*u ) D shl Next end-code
\ : 2* ( u -- 2*u ) dup + ;
( ----- 040 )
\ um/mod m/mod ks 27 oct 86
Code um/mod ( ud1 u2 -- urem uquot )
D C mov D pop A pop C div A D xchg A push Next
end-code
Code m/mod ( d1 n2 -- rem quot ) D C mov D pop
Label divide D+ A+ mov C+ A+ xor A pop 0< not
?[ C idiv [[ swap A D xchg A push Next ]?
C idiv D D or dup 0= not ?] A dec C D add ]]
end-code
\ : m/mod ( d n -- mod quot ) dup >r
\ abs over 0< IF under + swap THEN um/mod r@ 0<
\ IF negate over IF swap r@ + swap 1- THEN THEN rdrop ;
( ----- 041 )
\ /mod division trap 2/ ks 13 sep 88
Code /mod ( n1 n2 -- rem quot )
D C mov A pop cwd A push divide ]] end-code
\ : /mod ( n1 n2 -- rem quot ) over 0< swap m/mod ;
0 >label >divINT
Label divovl Assembler
4 # S add popf 1 # D- mov ;c: Abort" / overflow" ;
Code 2/ ( n1 -- n/2 ) D sar Next end-code
\ : 2/ ( n -- n/2 ) 2 / ;
( ----- 042 )
\ / mod */mod */ u/mod ud/mod ks 27 oct 86
: / ( n1 n2 -- quot ) /mod nip ;
: mod ( n1 n2 -- rem ) /mod drop ;
: */mod ( n1 n2 n3 -- rem quot ) >r m* r> m/mod ;
: */ ( n1 n2 n3 -- quot ) */mod nip ;
: u/mod ( u1 u2 -- urem uquot ) 0 swap um/mod ;
: ud/mod ( ud1 u2 -- urem udquot )
>r 0 r@ um/mod r> swap >r um/mod r> ;
( ----- 043 )
\ cmove cmove> move ks 27 oct 86
Code cmove ( from to quan -- ) A I xchg D C mov
W pop I pop D pop rep byte movs A I xchg Next
end-code
Code cmove> ( from to quan -- )
A I xchg D C mov W pop I pop D pop
Label moveup C dec C W add C I add C inc
std rep byte movs A I xchg cld Next end-code
Code move ( from to quan -- )
A I xchg D C mov W pop I pop D pop
Label domove I W cmp moveup CS ?]
rep byte movs A I xchg Next end-code
( ----- 044 )
\ place count ks 27 oct 86
| Code (place ( addr len to - len to) A I xchg D W mov
C pop I pop C push W inc domove ]] end-code
: place ( addr len to -) (place c! ;
Code count ( addr -- addr+1 len ) D W mov
W ) D- mov 0 # D+ mov W inc W push Next end-code
\ : move ( from to quan -- )
\ >r 2dup u< IF r> cmove> exit THEN r> cmove ;
\ : place ( addr len to -- ) over >r rot over 1+ r> move c! ;
\ : count ( adr -- adr+1 len ) dup 1+ swap c@ ;
( ----- 045 )
\ fill erase ks 27 oct 86
Code fill ( addr quan 8b -- )
D A xchg C pop W pop D pop rep byte stos Next
end-code
\ : fill ( addr quan 8b -- ) swap ?dup
\ IF >r over c! dup 1+ r> 1- cmove exit THEN 2drop ;
: erase ( addr quan --) 0 fill ;
( ----- 046 )
\ here allot , c, pad compile ks 27 oct 86
Code here ( -- addr ) D push u' dp U D) D mov Next
end-code
\ : here ( -- addr ) dp @ ;
Code allot ( n -- ) D u' dp U D) add D pop Next
end-code
\ : allot ( n -- ) dp +! ;
: , ( 16b -- ) here ! 2 allot ;
: c, ( 8b -- ) here c! 1 allot ;
: pad ( -- addr ) here $42 + ;
: compile r> dup 2+ >r @ , ; restrict
( ----- 047 )
\ input strings ks 23 dez 87
Variable #tib #tib off
Variable >tib here >tib ! $50 allot
Variable >in >in off
Variable blk blk off
Variable span span off
: tib ( -- addr ) >tib @ ;
: query tib $50 expect span @ #tib ! >in off ;
( ----- 048 )
\ skip scan /string ks 22 dez 87
Code skip ( addr len char -- addr1 len1 )
A D xchg C pop C0= not
?[ W pop 0=rep byte scas 0= not ?[ W dec C inc ]?
W push ]? C D mov Next end-code
Code scan ( addr0 len0 char -- addr1 len1 )
A D xchg C pop C0= not
?[ W pop 0<>rep byte scas 0= ?[ W dec C inc ]?
W push ]? C D mov Next end-code
Code /string ( addr0 len0 +n -- addr1 len1 )
A pop C pop D A sub CS ?[ A D add A A xor ]?
C D add D push A D xchg Next end-code
( ----- 049 )
\\ scan skip /string ks 29 jul 87
: skip ( addr0 len0 char -- addr1 len1 ) >r
BEGIN dup
WHILE over c@ r@ = WHILE 1- swap 1+ swap
REPEAT rdrop ;
: scan ( addr0 len0 char -- addr1 len1 ) >r
BEGIN dup
WHILE over c@ r@ - WHILE 1- swap 1+ swap
REPEAT rdrop ;
: /string ( addr0 len0 +n -- addr1 len1 )
over umin rot over + -rot - ;
( ----- 050 )
\ capital ks 19 dez 87
Create (capital Assembler $61 # A- cmp CS not
?[ $7B # A- cmp CS not
?[ $84 # A- cmp 0= ?[ $8E # A- mov ret ]? \
$94 # A- cmp 0= ?[ $99 # A- mov ret ]? \
$81 # A- cmp 0= ?[ $9A # A- mov ]? ret \
]? $20 # A- xor
]? ret end-code
Code capital ( char -- char' )
A D xchg (capital # call A D xchg Next
end-code
( ----- 051 )
\ upper ks 03 aug 87
Code upper ( addr len -- )
D C mov W pop D pop C0= not
?[ [[ W ) A- mov (capital # call
A- W ) mov W inc C0= ?] ]? Next
end-code
\\ high level definition, without umlauts
: capital ( char -- char')
dup Ascii a [ Ascii z 1+ ] Literal
uwithin not ?exit [ Ascii a Ascii A - ] Literal - ;
: upper ( addr len -- )
bounds ?DO I c@ capital I c! LOOP ;
( ----- 052 )
\ (word ks 28 mai 87
| Code (word ( char addr0 len0 -- addr1 ) D C mov W pop
A pop >in #) D mov D C sub >= not
?[ C push D W add 0=rep byte scas W D mov 0= not
?[ W dec D dec C inc
0<>rep byte scas 0= ?[ W dec ]?
]? A pop C A sub A >in #) add
W C mov D C sub 0= not
?[ D I xchg u' dp U D) W mov C- W ) mov
W inc rep byte movs $20 # W ) byte mov
D I mov u' dp U D) D mov Next
swap ]? C >in #) add
]? u' dp U D) W mov $2000 # W ) mov W D mov Next
end-code
( ----- 053 )
\\ (word ks 27 oct 86
| : (word ( char adr0 len0 -- addr )
rot >r over swap >in @ /string r@ skip
over swap r> scan >r rot over swap - r> 0<> - >in !
over - here dup >r place bl r@ count + c! r> ;
( ----- 054 )
\ source word parse name ks 03 aug 87
defer source
: (source ( -- addr len ) tib #tib @ ;
' (source Is source
: word ( char -- addr ) source (word ;
: parse ( char -- addr len ) >r source >in @ /string
over swap r> scan >r over - dup r> 0<> - >in +! ;
: name ( -- string ) bl word dup count upper exit ;
( ----- 055 )
\ state Ascii ," "lit (" " ks 16 sep 88
Variable state state off
: Ascii ( char -- n ) bl word 1+ c@
state @ 0=exit [compile] Literal ; immediate
: ," Ascii " parse here over 1+ allot place ;
Code "lit ( -- addr ) D push R ) D mov D W mov
W ) A- mov 0 # A+ mov A inc A R ) add Next
end-code restrict
\ : "lit r> r> under count + even >r >r ; restrict
: (" "lit ; restrict
: " compile (" ," align ; immediate restrict
( ----- 056 )
\ ." ( .( \ \\ hex decimal ks 12 dez 88
: (." "lit count type ; restrict
: ." compile (." ," align ; immediate restrict
: ( Ascii ) parse 2drop ; immediate
: .( Ascii ) parse type ; immediate
: \ >in @ negate c/l mod >in +! ; immediate
: \\ b/blk >in ! ; immediate
: have ( <name> -- f ) name find nip 0<> ; immediate
: \needs have 0=exit [compile] \ ;
: hex $10 base ! ;
: decimal &10 base ! ;
( ----- 057 )
\ number conversion: digit? accumulate convert ks 08 okt 87
: digit? ( char -- digit true/ false ) dup Ascii 9 >
IF [ Ascii A Ascii 9 - 1- ] Literal - dup Ascii 9 > and
THEN Ascii 0 - dup base @ u< dup ?exit nip ;
: accumulate ( +d0 adr digit -- +d1 adr ) swap >r
swap base @ um* drop rot base @ um* d+ r> ;
: convert ( +d1 addr0 -- +d2 addr2 )
1+ BEGIN count digit? WHILE accumulate REPEAT 1- ;
( ----- 058 )
\ number conversion ks 29 jun 87
| : end? ( -- flag ) >in @ 0= ;
| : char ( addr0 -- addr1 char ) count -1 >in +! ;
| : previous ( addr0 -- addr0 char ) 1- count ;
| : punctuation? ( char -- flag )
Ascii , over = swap Ascii . = or ;
\ : punctuation? ( char -- f ) ?" .," ;
| : fixbase? ( char -- char false / newbase true ) capital
Ascii $ case? IF $10 true exit THEN
Ascii H case? IF $10 true exit THEN
Ascii & case? IF &10 true exit THEN
Ascii % case? IF 2 true exit THEN false ;
( ----- 059 )
\ number conversion: dpl ?num ?nonum ?dpl ks 27 oct 86
Variable dpl -1 dpl !
| : ?num ( flag -- exit if true ) 0=exit
rdrop drop r> IF dnegate THEN rot drop
dpl @ 1+ ?dup ?exit drop true ;
| : ?nonum ( flag -- exit if true ) 0=exit
rdrop 2drop drop rdrop false ;
| : ?dpl dpl @ -1 = ?exit 1 dpl +! ;
( ----- 060 )
\ number conversion: number? number ks 27 oct 86
: number? ( string -- string false / n 0< / d 0> )
base push >in push dup count >in ! dpl on
0 >r ( +sign) 0.0 rot end? ?nonum char
Ascii - case? IF rdrop true >r end? ?nonum char THEN
fixbase? IF base ! end? ?nonum char THEN
BEGIN digit? 0= ?nonum
BEGIN accumulate ?dpl end? ?num char digit?
0= UNTIL previous punctuation? 0= ?nonum
dpl off end? ?num char
REPEAT ;
: number ( string -- d )
number? ?dup 0= Abort" ?" 0> ?exit extend ;
( ----- 061 )
\ hide reveal immediate restrict ks 18 m„r 88
Variable last last off
: last' ( -- cfa ) last @ name> ;
| : last? ( -- false / nfa true) last @ ?dup ;
: hide last? 0=exit 2- @ current @ ! ;
: reveal last? 0=exit 2- current @ ! ;
: Recursive reveal ; immediate restrict
| : flag! ( 8b --)
last? IF under c@ or over c! THEN drop ;
: immediate $40 flag! ;
: restrict $80 flag! ;
( ----- 062 )
\ clearstack hallot heap heap? ks 27 oct 86
Code clearstack u' s0 U D) S mov D pop Next end-code
: hallot ( quan -- )
s0 @ over - swap sp@ 2+ dup rot - dup s0 !
2 pick over - di move clearstack ei s0 ! ;
: heap ( -- addr ) s0 @ 6 + ;
: heap? ( addr -- flag ) heap up@ uwithin ;
| : heapmove ( from -- from )
dup here over - dup hallot
heap swap cmove heap over - last +! reveal ;
( ----- 063 )
\ Does> ; ks 18 m„r 88
| Create dodo Assembler
R dec R dec I R ) mov \ push IP
D push 2 W D) D lea \ load parameter address
W ) I mov 3 # I add Next end-code
dodo Host tdodo ! Target \ target compiler needs to know
: (;code r> last' ! ;
: Does> compile (;code $E9 c, ( jmp instruction)
dodo here 2+ - , ; immediate restrict
( ----- 064 )
\ ?head | alignments ks 19 m„r 88
Variable ?head ?head off
: | ?head @ ?exit ?head on ;
\ no alignment required on x86
: even ( addr -- addr1 ) ; immediate
: align ( -- ) ; immediate
: halign ( -- ) ; immediate
Variable warning warning on
| : ?exists warning @ 0=exit
last @ current @ (find nip 0=exit
space last @ .name ." exists " ?cr ;
( ----- 065 )
\ Create Variable ks 19 m„r 88
Defer makeview ' 0 Is makeview
: Create align here makeview , current @ @ ,
name c@ dup 1 $20 uwithin not Abort" invalid name"
here last ! 1+ allot align ?exists
?head @ IF 1 ?head +! dup , \ Pointer to Code
halign heapmove $20 flag! dup dp !
THEN drop reveal 0 ,
;Code ( -- addr ) D push 2 W D) D lea Next end-code
: Variable Create 0 , ;
( ----- 066 )
\ nfa? ks 28 mai 87
Code nfa? ( thread cfa -- nfa / false )
W pop R A mov $1F # C mov
[[ W ) W mov W W or 0= not
?[[ 2 W D) R- mov C R and 3 R W DI) R lea
$20 # 2 W D) test 0= not ?[ R ) R mov ]?
D R cmp 0= ?] 2 W D) W lea
]? W D mov A R mov Next end-code
\\
: nfa? ( thread cfa -- nfa / false ) >r
BEGIN @ dup 0= IF rdrop exit THEN
dup 2+ name> r@ = UNTIL 2+ rdrop ;
( ----- 067 )
\ >name name> >body .name ks 13 aug 87
: >name ( acf -- anf / ff ) voc-link
BEGIN @ dup WHILE 2dup 4 - swap nfa?
?dup IF -rot 2drop exit THEN REPEAT nip ;
: (name> ( nfa -- cfa ) count $1F and + even ;
: name> ( nfa -- cfa )
dup (name> swap c@ $20 and 0=exit @ ;
: >body ( cfa -- pfa ) 2+ ;
: body> ( pfa -- cfa ) 2- ;
: .name ( nfa -- ) ?dup IF dup heap? IF ." | " THEN
count $1F and type ELSE ." ???" THEN space ;
( ----- 068 )
\ : ; Constant Variable ks 29 oct 86
: Create: Create hide current @ context ! 0 ] ;
: : Create:
;Code R dec R dec I R ) mov 2 W D) I lea Next
end-code
: ; 0 ?pairs compile unnest [compile] [ reveal ;
immediate restrict
: Constant ( n -- ) Create ,
;Code ( -- n ) D push 2 W D) D mov Next end-code
( ----- 069 )
\ uallot User Alias Defer ks 02 okt 87
: uallot ( quan -- offset ) even dup udp @ +
$FF u> Abort" Userarea full" udp @ swap udp +! ;
: User Create 2 uallot c,
;Code ( -- addr ) D push 2 W D) D- mov
0 # D+ mov U D add Next end-code
: Alias ( cfa -- )
Create last @ dup c@ $20 and
IF -2 allot ELSE $20 flag! THEN (name> ! ;
| : crash true Abort" crash" ;
: Defer Create ['] crash ,
;Code 2 W D) W mov W ) jmp end-code
( ----- 070 )
\ vp current context also toss ks 02 okt 87
Create vp $10 allot
Variable current
: context ( -- adr ) vp dup @ + 2+ ;
| : thru.vocstack ( -- from to ) vp 2+ context ;
\ "Only Forth also Assembler" gives
\ vp: countword = 6 | Root | Forth | Assembler |
: also vp @ &10 > Error" Vocabulary stack full"
context @ 2 vp +! context ! ;
: toss vp @ 0=exit -2 vp +! ;
( ----- 071 )
\ Vocabulary Forth Only Onlyforth definitions ks 19 jun 88
: Vocabulary Create 0 , 0 , here voc-link @ , voc-link !
Does> context ! ;
\ | Name | Code | Thread | Coldthread | Voc-link |
Vocabulary Forth
Host h' Transient 8 + @ T h' Forth 8 + H !
Target Forth also definitions
Vocabulary Root
: Only vp off Root also ;
: Onlyforth Only Forth also definitions ;
: definitions context @ current ! ;
( ----- 072 )
\ order vocs words ks 19 jun 88
| : init-vocabularys voc-link @
BEGIN dup 2- @ over 4- ! @ ?dup 0= UNTIL ;
| : .voc ( adr -- ) @ 2- >name .name ;
: order vp 4+ context over umax
DO I .voc -2 +LOOP 2 spaces current .voc ;
: vocs voc-link
BEGIN @ ?dup WHILE dup 6 - >name .name REPEAT ;
: words ( -- ) [compile] Ascii capital >r context @
BEGIN @ dup stop? 0= and
WHILE ?cr dup 2+ r@ bl = over 1+ c@ r@ = or
IF .name space ELSE drop THEN
REPEAT drop rdrop ;
( ----- 073 )
\ (find found ks 09 jul 87
| : found ( nfa -- cfa n ) dup c@ >r
(name> r@ $20 and IF @ THEN
-1 r@ $80 and IF 1- THEN
r> $40 and IF negate THEN ;
Code (find ( string thread -- string ff / anf tf )
D I xchg W pop D push W ) A- mov W inc
W D mov 0 # C+ mov $1F # A+ mov A+ A- and
[[ I ) I mov I I or 0= not
?[[ 2 I D) C- mov A+ C- and A- C- cmp dup 0= ?]
I push D W mov 3 # I add
0=rep byte cmps I pop 0= ?]
3 # I add I W mov -1 # D mov
][ D W mov 0 # D mov ]? W dec I pop W push Next
end-code
( ----- 074 )
\\ -text (find ks 02 okt 87
: -text ( adr1 len adr2 -- 0< 1<2 / 0= 1=2 / 0> 1>2 )
over bounds
DO drop count I c@ - dup IF LEAVE THEN LOOP nip ;
: (find ( string thread -- str false / NFA +n )
over c@ $1F and >r @
BEGIN dup WHILE dup @ swap 2+ dup c@ $1F and r@ =
IF dup 1+ r@ 4 pick 1+ -text
0= IF rdrop -rot drop exit
THEN THEN drop
REPEAT rdrop ;
( ----- 075 )
\ find ' [compile] ['] nullstring? ks 29 oct 86
: find ( string -- acf n / string false )
context dup @ over 2- @ = IF 2- THEN
BEGIN under @ (find IF nip found exit THEN
swap 2- dup vp = UNTIL drop false ;
: ' ( -- cfa ) name find ?exit Error" ?" ;
: [compile] ' , ; immediate restrict
: ['] ' [compile] Literal ; immediate restrict
: nullstring? ( string -- string false / true )
dup c@ 0= dup 0=exit nip ;
( ----- 076 )
\ interpreter ks 07 dez 87
Defer notfound
| : interpreter ( string -- ) find ?dup
IF 1 and IF execute exit THEN
Error" compile only"
THEN number? ?exit notfound ;
| : compiler ( string -- ) find ?dup
IF 0> IF execute exit THEN , exit THEN
number? ?dup IF 0> IF swap [compile] Literal THEN
[compile] Literal exit
THEN notfound ;
( ----- 077 )
\ compiler [ ] ks 16 sep 88
: no.extensions ( string -- )
state @ IF Abort" ?" THEN Error" ?" ;
' no.extensions Is notfound
Defer parser ( string -- ) ' interpreter Is parser
: interpret
BEGIN ?stack name nullstring? IF aborted off exit THEN
parser REPEAT ;
: [ ['] interpreter Is parser state off ; immediate
: ] ['] compiler Is parser state on ;
( ----- 078 )
\ Is ks 07 dez 87
: (is r> dup 2+ >r @ ! ;
| : def? ( cfa -- )
@ [ ' notfound @ ] Literal - Abort" not deferred" ;
: Is ( addr -- ) ' dup def? >body
state @ IF compile (is , exit THEN ! ; immediate
( ----- 079 )
\ ?stack ks 01 okt 87
| : stackfull ( -- ) depth $20 > Abort" tight stack"
reveal last? IF dup heap? IF name> ELSE 4- THEN (forget THEN
true Abort" dictionary full" ;
Code ?stack u' dp U D) A mov S A sub CS
?[ $100 # A add CS ?[ ;c: stackfull ; Assembler ]? ]?
u' s0 U D) A mov A inc A inc S A sub
CS not ?[ Next ]? ;c: true Abort" stack empty" ;
\ : ?stack sp@ here - $100 u< IF stackfull THEN
\ sp@ s0 @ u> Abort" stack empty" ;
( ----- 080 )
\ .status push ks 29 oct 86
| Create: pull r> r> ! ;
: push ( addr -- )
r> swap dup >r @ >r pull >r >r ; restrict
Defer .status ' noop Is .status
( ----- 081 )
: rdepth ( -- +n ) r0 @ rp@ 2+ - 2/ ;
: depth ( -- +n ) sp@ s0 @ swap - 2/ ;
( ----- 082 )
\ prompt quit ks 16 sep 88
: (prompt .status state @ IF cr ." ] " exit THEN
aborted @ 0= IF ." ok" THEN cr ;
Defer prompt ' (prompt Is prompt
: (quit BEGIN prompt query interpret REPEAT ;
Defer 'quit ' (quit Is 'quit
: quit r0 @ rp! [compile] [ blk off
key? IF key drop THEN
'quit ;
( ----- 083 )
\ end-trace abort ks 26 jul 87
: standardi/o [ output ] Literal output 4 cmove ;
Code end-trace next-link # W mov $AD # A- mov
$FF97 # C mov [[ W ) W mov W W or 0= not
?[[ A- -4 W D) mov C -3 W D) mov
]]? lods A W xchg W ) jmp end-code
Defer 'abort ' noop Is 'abort
: abort end-trace clearstack 'abort standardi/o quit ;
( ----- 084 )
\ (error Abort" Error" ks 16 sep 88
Variable scr 1 scr !
Variable r# r# off
: (error ( string -- ) rdrop r> aborted ! standardi/o
space here .name count type space ?cr
blk @ ?dup IF scr ! >in @ r# ! THEN quit ;
' (error errorhandler !
: (abort" "lit swap IF >r clearstack r>
errorhandler perform exit THEN drop ; restrict
| : (error" "lit swap IF errorhandler perform exit THEN
drop ; restrict
( ----- 085 )
\ -trailing space spaces ks 16 sep 88
: Abort" compile (abort" ," align ; immediate restrict
: Error" compile (error" ," align ; immediate restrict
$20 Constant bl
: -trailing ( addr n1 -- addr n2)
dup 0 ?DO 2dup + 1- c@ bl - IF LEAVE THEN 1- LOOP ;
: space bl emit ;
: spaces ( u -- ) 0 ?DO space LOOP ;
( ----- 086 )
\ hold <# #> sign # #s ks 29 dez 87
| : hld ( -- addr) pad 2- ;
: hold ( char -- ) -1 hld +! hld @ c! ;
: <# hld hld ! ;
: #> ( 32b -- addr +n ) 2drop hld @ hld over - ;
: sign ( n -- ) 0< not ?exit Ascii - hold ;
: # ( +d1 -- +d2)
base @ ud/mod rot dup 9 > 7 and + Ascii 0 + hold ;
: #s ( +d -- 0 0 ) BEGIN # 2dup d0= UNTIL ;
( ----- 087 )
\ print numbers .s ks 07 feb 89
: d.r ( d +n -- ) -rot under dabs <# #s rot sign #>
rot over max over - spaces type ;
: d. ( d -- ) 0 d.r space ;
: .r ( n +n -- ) swap extend rot d.r ;
: . ( n -- ) extend d. ;
: u.r ( u +n -- ) 0 swap d.r ;
: u. ( u -- ) 0 d. ;
: .s sp@ s0 @ over - $20 umin bounds ?DO I @ u. 2 +LOOP ;
( ----- 088 )
\ c/l l/s
&64 Constant c/l \ Screen line length
&16 Constant l/s \ lines per screen
( ----- 089 )
\ multitasker primitives ks 29 oct 86
Code pause D push I push R push
S 6 U D) mov 2 U D) U add 4 # U add U jmp
end-code
: lock ( addr -- )
dup @ up@ = IF drop exit THEN
BEGIN dup @ WHILE pause REPEAT up@ swap ! ;
: unlock ( addr -- ) dup lock off ;
Label wake Assembler U pop 2 # U sub A pop
popf 6 U D) S mov R pop I pop D pop Next
end-code
$E9 4 * >label >taskINT
( ----- 090 )
( ----- 091 )
$10000 Constant limit Variable first
$408 Constant b/buf \ real size of block buffer
$400 Constant b/blk \ bytes/block
Defer r/w \ low level disk access word
( ----- 092 )
( ----- 093 )
( ----- 094 )
( ----- 095 )
( ----- 096 )
( ----- 097 )
( ----- 098 )
( ----- 099 )
\ endpoints of forget uh 27 apr 88
| : |? ( nfa -- flag ) c@ $20 and ;
| : forget? ( adr nfa -- flag ) \ code in heap or above adr ?
name> under 1+ u< swap heap? or ;
| : endpoint ( addr sym thread -- addr sym' )
BEGIN BEGIN @ 2 pick over u> IF drop exit THEN
dup heap? UNTIL dup >r 2+ dup |?
IF >r over r@ forget? IF r@ (name> >body umax THEN
rdrop THEN r>
REPEAT ;
| : endpoints ( addr -- addr symb ) heap voc-link @
BEGIN @ ?dup WHILE dup >r 4- endpoint r> REPEAT ;
( ----- 100 )
\ remove, -words, -tasks ks 30 apr 88
: remove ( dic sym thread -- dic sym )
BEGIN dup @ ?dup \ unlink forg. words
WHILE dup heap?
IF 2 pick over u> ELSE 3 pick over 1+ u< THEN
IF @ over ! ( unlink word) ELSE nip THEN REPEAT drop ;
| : remove-words ( dic sym -- dic sym ) voc-link
BEGIN @ ?dup WHILE dup >r 4- remove r> REPEAT ;
| : >up 2+ dup @ 2+ + ;
| : remove-tasks ( dic -- ) up@
BEGIN dup >up up@ - WHILE 2dup >up swap here uwithin
IF dup >up >up over - 2- 2- over 2+ ! ELSE >up THEN
REPEAT 2drop ;
( ----- 101 )
\ remove-vocs trim ks 31 oct 86
| : remove-vocs ( dic symb -- dic symb )
voc-link remove thru.vocstack
DO 2dup I @ -rot uwithin
IF [ ' Forth 2+ ] Literal I ! THEN -2 +LOOP
2dup current @ -rot uwithin 0=exit
[ ' Forth 2+ ] Literal current ! ;
Defer custom-remove ' noop Is custom-remove
: trim ( dic symb -- ) next-link remove
over remove-tasks remove-vocs remove-words
custom-remove heap swap - hallot dp ! last off ;
( ----- 102 )
\ deleting words from dict. ks 02 okt 87
: clear here dup up@ trim dp ! ;
: (forget ( adr -- )
dup heap? Abort" is symbol" endpoints trim ;
: forget ' dup [ dp ] Literal @ u< Abort" protected"
>name dup heap? IF name> ELSE 4- THEN (forget ;
: empty [ dp ] Literal @ up@ trim
[ udp ] Literal @ udp ! ;
( ----- 103 )
\ save stop? ?cr ks 1UH 26sep88
: save here up@ trim up@ origin $100 cmove
voc-link @ BEGIN dup 4- @ over 2- ! @ ?dup 0= UNTIL ;
$1B Constant #esc
| : end? key #esc case? 0=
IF #cr case? 0= IF 3 ( Ctrl-C ) - ?exit THEN THEN
true rdrop ;
: stop? ( -- flag ) key? IF end? end? THEN false ;
: ?cr col c/l u> 0=exit cr ;
( ----- 104 )
\ in/output structure ks 31 oct 86
| : Out: Create dup c, 2+ Does> c@ output @ + perform ;
: Output: Create: Does> output ! ;
0 Out: emit Out: cr Out: type Out: del
Out: page Out: at Out: at? drop
: row ( -- row ) at? drop ;
: col ( -- col ) at? nip ;
| : In: Create dup c, 2+ Does> c@ input @ + perform ;
: Input: Create: Does> input ! ;
0 In: key In: key? In: decode In: expect drop
( ----- 105 )
\ Alias only definitionen ks 31 oct 86
Root definitions
: seal [ ' Root >body ] Literal off ; \ "erases" Root Vocab.
' Only Alias Only
' Forth Alias Forth
' words Alias words
' also Alias also
' definitions Alias definitions
Forth definitions
( ----- 106 )
\ 'restart 'cold ks 01 sep 88
Defer 'restart ' noop Is 'restart
| : (restart ['] (quit Is 'quit 'restart
[ errorhandler ] Literal @ errorhandler !
['] noop Is 'abort end-trace clearstack
standardi/o interpret quit ;
Defer 'cold ' noop Is 'cold
| : (cold origin up@ $100 cmove $80 count
$50 umin >r tib r@ move r> #tib ! >in off blk off
init-vocabularys 'cold Onlyforth $80 c@ 0= IF
page logo count type cr THEN (restart ;
( ----- 107 )
\ (boot ks 11 m„r 89
Label #segs ( -- R: seg ) Assembler
C: seg ' limit >body #) R mov R R or 0= not
?[ 4 # C- mov R C* shr R inc ret ]?
$1000 # R mov ret
end-code
Label (boot Assembler cli cld A A xor A D: mov
#segs # call C: D mov D R add R E: mov
$200 # C mov 0 # I mov I W mov rep movs
wake # >taskINT #) mov C: >taskINT 2+ #) mov
divovl # >divINT #) mov C: >divINT 2+ #) mov ret
end-code
( ----- 108 )
\ restart ks 09 m„r 89
Label warmboot here >restart 2+ - >restart ! Assembler
(boot # call
here ' (restart >body # I mov
Label bootsystem
C: A mov A E: mov A D: mov A S: mov
s0 #) U mov 6 # U add u' s0 U D) S mov
D pop u' r0 U D) R mov sti Next
end-code
Code restart here 2- ! end-code
( ----- 109 )
\ bye ks 11 m„r 89
Variable return_code return_code off
| Code (bye cli A A xor A E: mov #segs # call
C: D mov D R add R D: mov 0 # I mov I W mov
$200 # C mov rep movs sti \ restore interrupts
\ $4C # A+ mov C: seg return_code #) A- mov $21 int
warmboot # call
end-code
: bye empty page (bye ;
( ----- 110 )
\ cold ks 09 m„r 89
here >cold 2+ - >cold ! Assembler
(boot # call C: A mov A D: mov A E: mov
\ #segs # call $41 # R add \ another k for the ints
\ $4A # A+ mov $21 int \ alloc memory
\ CS ?[ $10 # return_code #) byte mov ' (bye @ # jmp ]?
here s0 #) W mov 6 # W add origin # I mov $20 # C mov
rep movs ' (cold >body # I mov bootsystem # jmp
end-code
Code cold here 2- ! end-code
( ----- 111 )
\ System patchup ks 16 sep 88
1 &11 +thru \ PC-BIOS interface
: forth-83 ; \ last word in Dictionary
0 ' limit >body ! $DFF6 s0 ! $E77C r0 !
s0 @ s0 2- ! here dp !
Host tudp @ Target udp !
Host tvoc-link @ Target voc-link !
Host tnext-link @ Target next-link !
Host tfile-link @ Target Forth file-link !
Host T move-threads H
save-buffers cr .( unresolved: ) .unresolved
( ----- 112 )
\ lc@ lc! l@ l! special 8088 operators ks 27 oct 86
Code lc@ ( seg:addr -- 8b ) D: pop D W mov
W ) D- mov 0 # D+ mov C: A mov A D: mov Next
end-code
Code lc! ( 8b seg:addr -- ) D: pop A pop D W mov
A- W ) mov C: A mov A D: mov D pop Next end-code
Code l@ ( seg:addr -- 16b ) D: pop D W mov
W ) D mov C: A mov A D: mov Next end-code
Code l! ( 16b seg:addr -- ) D: pop A pop D W mov
A W ) mov C: A mov A D: mov D pop Next end-code
( ----- 113 )
\ ltype lmove special 8088 operators ks 11 dez 87
: ltype ( seg:addr len -- )
0 ?DO 2dup I + lc@ emit LOOP 2drop ;
Code lmove ( from.seg:addr to.seg:addr quan -- )
A I xchg D C mov W pop E: pop
I pop D: pop I W cmp CS
?[ rep byte movs
][ C dec C W add C I add C inc
std rep byte movs cld
]? A I xchg C: A mov A E: mov
A D: mov D pop Next end-code
( ----- 114 )
( ----- 115 )
\ APM PC Shutdown - poweroff
CODE poweroff ( -- )
\ Connect to APM API
$5301 # A mov R R xor $15 int
\ Try to set APM version (to 1.2)
$530E # A mov R R xor $0102 # C mov $15 int
\ Turn off the system
$5307 # A mov $01 # R mov $03 # C mov $15 int
END-CODE
( ----- 116 )
\ BIOS keyboard input ks 16 sep 88
Code (key@ ( -- 8b ) D push A+ A+ xor $16 int
A- D- xchg 0 # D+ mov Next end-code
Code (key? ( -- f ) D push 1 # A+ mov D D xor
$16 int 0= not ?[ D dec ]? Next end-code
: empty-keys ;
: (key ( -- 8b ) BEGIN pause (key? UNTIL (key@ ;
( ----- 117 )
\ (decode expect ks 16 sep 88
7 Constant #bel 8 Constant #bs
9 Constant #tab $A Constant #lf
$D Constant #cr $26 Constant #eof
: (decode ( addr pos1 key -- addr pos2 )
#bs case? IF dup 0=exit del 1- exit THEN
#cr case? IF dup span ! space exit THEN
#lf case? IF exit THEN
#eof case? IF bye THEN
>r 2dup + r@ swap c! r> emit 1+ ;
: (expect ( addr len1 -- ) span ! 0
BEGIN dup span @ u< WHILE key decode REPEAT 2drop ;
Input: keyboard [ here input ! ]
(key (key? (decode (expect [ drop
( ----- 118 )
\ BIOS character output ks 29 jun 87
Code charout ( char -- ) D- A- mov
$E # A+ mov $10 int D pop ' pause # W mov W ) jmp
end-code
&80 Constant c/row &25 Constant c/col
: (emit ( char -- ) dup bl u< IF $80 or THEN charout ;
: (cr #cr charout #lf charout ;
: (del #bs charout bl charout #bs charout ;
: (at 2drop ;
: (at? 0 0 ;
: (page c/col 0 DO cr LOOP ;
( ----- 119 )
\ BIOS character output ks 7 may 85
: bell #bel charout ;
: tipp ( addr len -- ) bounds ?DO I c@ emit LOOP ;
Output: display [ here output ! ]
(emit (cr tipp (del (page (at (at? [ drop
( ----- 120 )
Code pc@ ( port -- 8b )
D byte in A- D- mov D+ D+ xor Next
end-code
Code pc! ( 8b port -- )
A pop D byte out D pop Next
end-code
( ----- 121 )
\ zero terminated strings cas 25jan06
: counted ( asciz -- addr len )
dup -1 0 scan drop over - ;
: >asciz ( string addr -- asciz ) 2dup >r -
IF count r@ place r@ THEN 0 r> count + c! 1+ ;
: asciz ( -- asciz ) name here >asciz ;