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fcd77f80ab
4
blk/001
4
blk/001
@ -3,8 +3,8 @@ MASTER INDEX
|
||||
3 Usage 30 Dictionary
|
||||
70 Implementation notes 100 Block editor
|
||||
200 Z80 assembler 260 Cross compilation
|
||||
280 Z80 boot code 350 ACIA driver
|
||||
370 SD Card driver 390 Inner core
|
||||
280 Z80 boot code
|
||||
|
||||
|
||||
|
||||
|
||||
|
||||
15
blk/350
15
blk/350
@ -1,15 +0,0 @@
|
||||
ACIA driver
|
||||
|
||||
Manage I/O from an asynchronous communication interface adapter
|
||||
(ACIA). provides "EMIT" to put c char on the ACIA as well as
|
||||
an input buffer. You have to call "~ACIA" on interrupt for
|
||||
this module to work well.
|
||||
|
||||
CONFIGURATION
|
||||
|
||||
ACIA_CTL: IO port for the ACIA's control registers
|
||||
ACIA_IO: IO port for the ACIA's data registers
|
||||
ACIA_MEM: Address in memory that can be used variables shared
|
||||
with ACIA's native words. 8 bytes used.
|
||||
|
||||
Load z80 words with "352 LOAD" and Forth words with "357 LOAD".
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||||
15
blk/352
15
blk/352
@ -1,15 +0,0 @@
|
||||
( Save ACIA conf )
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||||
ACIA_CTL
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||||
: ACIA_CTL [ LITN ] ;
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||||
ACIA_IO
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||||
: ACIA_IO [ LITN ] ;
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||||
ACIA_MEM
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||||
: ACIA_MEM [ LITN ] ;
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||||
( Memory layout
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||||
+0 ACIAR>
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||||
+2 ACIAW>
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||||
+4 ACIA(
|
||||
+6 ACIA) )
|
||||
|
||||
353 356 LOADR
|
||||
|
||||
16
blk/353
16
blk/353
@ -1,16 +0,0 @@
|
||||
(entry) ~ACIA
|
||||
AF PUSHqq,
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||||
HL PUSHqq,
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||||
DE PUSHqq,
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||||
( Read our character from ACIA into our BUFIDX )
|
||||
ACIA_CTL INAn,
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||||
0x01 ANDn, ( is ACIA rcv buf full? )
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||||
IFNZ,
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||||
( correct interrupt cause )
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||||
( +2 == ACIAW> )
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||||
ACIA_MEM 2+ LDHL(nn),
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||||
( is it == to ACIAR>? )
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||||
( +0 == ACIAR> )
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||||
DE ACIA_MEM LDdd(nn),
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||||
( carry cleared from ANDn above )
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DE SBCHLss, ( cont. )
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||||
16
blk/354
16
blk/354
@ -1,16 +0,0 @@
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||||
IFNZ, ( buffer full? )
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||||
( no, continue )
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DE ADDHLss, ( restore ACIAW> )
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( buffer not full, let's write )
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ACIA_IO INAn,
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(HL) A LDrr,
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( advance W> )
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HL INCss,
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||||
( +2 == ACIAW> )
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||||
ACIA_MEM 2+ LD(nn)HL,
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( +6 == ACIA) )
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DE ACIA_MEM 6 + LDdd(nn),
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DE SUBHLss,
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||||
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||||
|
||||
( cont. )
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||||
16
blk/356
16
blk/356
@ -1,16 +0,0 @@
|
||||
IFZ, ( end of buffer reached? )
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||||
( yes )
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||||
( +4 == ACIA( )
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||||
ACIA_MEM 4 + LDHL(nn),
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||||
( +2 == ACIAW> )
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||||
ACIA_MEM 2+ LD(nn)HL,
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||||
THEN,
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||||
THEN,
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||||
THEN,
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||||
DE POPqq,
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HL POPqq,
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AF POPqq,
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||||
EI,
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||||
RETI,
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||||
|
||||
|
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14
blk/357
14
blk/357
@ -1,14 +0,0 @@
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||||
0x20 CONSTANT ACIABUFSZ
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||||
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( Points to ACIA buf )
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: ACIA( [ ACIA_MEM 4 + LITN ] ;
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||||
( Points to ACIA buf end )
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||||
: ACIA) [ ACIA_MEM 6 + LITN ] ;
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||||
( Read buf pointer. Pre-inc )
|
||||
: ACIAR> [ ACIA_MEM LITN ] ;
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||||
( Write buf pointer. Post-inc )
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||||
: ACIAW> [ ACIA_MEM 2 + LITN ] ;
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||||
( This means that if W> == R>, buffer is full.
|
||||
If R>+1 == W>, buffer is empty. )
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||||
|
||||
358 360 LOADR
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||||
16
blk/358
16
blk/358
@ -1,16 +0,0 @@
|
||||
: ACIA$
|
||||
H@ DUP DUP ACIA( ! ACIAR> !
|
||||
1+ ACIAW> ! ( write index starts one position later )
|
||||
ACIABUFSZ ALLOT
|
||||
H@ ACIA) !
|
||||
( setup ACIA
|
||||
CR7 (1) - Receive Interrupt enabled
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||||
CR6:5 (00) - RTS low, transmit interrupt disabled.
|
||||
CR4:2 (101) - 8 bits + 1 stop bit
|
||||
CR1:0 (10) - Counter divide: 64 )
|
||||
0b10010110 ACIA_CTL PC!
|
||||
( setup interrupt )
|
||||
0xc3 0x4e RAM+ C! ( c3==JP, 4e==INTJUMP )
|
||||
['] ~ACIA 0x4f RAM+ !
|
||||
(im1)
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||||
;
|
||||
14
blk/359
14
blk/359
@ -1,14 +0,0 @@
|
||||
: KEY
|
||||
( inc then fetch )
|
||||
ACIAR> @ 1+ DUP ACIA) @ = IF
|
||||
DROP ACIA( @
|
||||
THEN
|
||||
|
||||
( As long as R> == W>-1, it means that buffer is empty )
|
||||
BEGIN DUP ACIAW> @ = NOT UNTIL
|
||||
|
||||
ACIAR> !
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||||
ACIAR> @ C@
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||||
;
|
||||
|
||||
|
||||
7
blk/360
7
blk/360
@ -1,7 +0,0 @@
|
||||
: EMIT
|
||||
( As long at CTL bit 1 is low, we are transmitting. wait )
|
||||
BEGIN ACIA_CTL PC@ 0x02 AND UNTIL
|
||||
( The way is clear, go! )
|
||||
ACIA_IO PC!
|
||||
;
|
||||
|
||||
4
blk/370
4
blk/370
@ -1,4 +0,0 @@
|
||||
SD Card driver
|
||||
|
||||
Load the z80 part with "372 LOAD", the Forth part with
|
||||
"374 LOAD".
|
||||
9
blk/373
9
blk/373
@ -1,9 +0,0 @@
|
||||
CODE _sdcSel
|
||||
SDC_CSLOW OUTnA,
|
||||
;CODE
|
||||
|
||||
CODE _sdcDesel
|
||||
SDC_CSHIGH OUTnA,
|
||||
;CODE
|
||||
|
||||
|
||||
16
blk/374
16
blk/374
@ -1,16 +0,0 @@
|
||||
( -- n )
|
||||
: _idle 0xff _sdcSR ;
|
||||
|
||||
( -- n )
|
||||
( _sdcSR 0xff until the response is something else than 0xff
|
||||
for a maximum of 20 times. Returns 0xff if no response. )
|
||||
: _wait
|
||||
0 ( cnt )
|
||||
BEGIN
|
||||
_idle
|
||||
DUP 0xff = IF DROP ELSE SWAP DROP EXIT THEN
|
||||
1+
|
||||
DUP 20 = UNTIL
|
||||
DROP 0xff
|
||||
;
|
||||
375 386 LOADR
|
||||
10
blk/375
10
blk/375
@ -1,10 +0,0 @@
|
||||
( -- )
|
||||
( The opposite of sdcWaitResp: we wait until response is 0xff.
|
||||
After a successful read or write operation, the card will be
|
||||
busy for a while. We need to give it time before interacting
|
||||
with it again. Technically, we could continue processing on
|
||||
our side while the card it busy, and maybe we will one day,
|
||||
but at the moment, I'm having random write errors if I don't
|
||||
do this right after a write, so I prefer to stay cautious
|
||||
for now. )
|
||||
: _ready BEGIN _idle 0xff = UNTIL ;
|
||||
16
blk/376
16
blk/376
@ -1,16 +0,0 @@
|
||||
( c n -- c )
|
||||
( Computes n into crc c with polynomial 0x09
|
||||
Note that the result is "left aligned", that is, that 8th
|
||||
bit to the "right" is insignificant (will be stop bit). )
|
||||
: _crc7
|
||||
XOR ( c )
|
||||
8 0 DO
|
||||
2 * ( <<1 )
|
||||
DUP 255 > IF
|
||||
( MSB was set, apply polynomial )
|
||||
0xff AND
|
||||
0x12 XOR ( 0x09 << 1, we apply CRC on high bits )
|
||||
THEN
|
||||
LOOP
|
||||
;
|
||||
|
||||
16
blk/377
16
blk/377
@ -1,16 +0,0 @@
|
||||
( c n -- c )
|
||||
( Computes n into crc c with polynomial 0x1021 )
|
||||
: _crc16
|
||||
SWAP DUP 256 / ( n c c>>8 )
|
||||
ROT XOR ( c x )
|
||||
DUP 16 / XOR ( c x^x>>4 )
|
||||
SWAP 256 * ( x c<<8 )
|
||||
OVER 4096 * XOR ( x c^x<<12 )
|
||||
OVER 32 * XOR ( x c^x<<5 )
|
||||
XOR ( c )
|
||||
;
|
||||
|
||||
( send-and-crc7 )
|
||||
( n c -- c )
|
||||
: _s+crc SWAP DUP _sdcSR DROP _crc7 ;
|
||||
|
||||
16
blk/378
16
blk/378
@ -1,16 +0,0 @@
|
||||
( cmd arg1 arg2 -- resp )
|
||||
( Sends a command to the SD card, along with arguments and
|
||||
specified CRC fields. (CRC is only needed in initial commands
|
||||
though). This does *not* handle CS. You have to
|
||||
select/deselect the card outside this routine. )
|
||||
: _cmd
|
||||
_wait DROP ROT ( a1 a2 cmd )
|
||||
0 _s+crc ( a1 a2 crc )
|
||||
ROT 256 /MOD ROT ( a2 h l crc )
|
||||
_s+crc _s+crc ( a2 crc )
|
||||
SWAP 256 /MOD ROT ( h l crc )
|
||||
_s+crc _s+crc ( crc )
|
||||
0x01 OR ( ensure stop bit )
|
||||
_sdcSR DROP ( send CRC )
|
||||
_wait ( wait for a valid response... )
|
||||
;
|
||||
16
blk/379
16
blk/379
@ -1,16 +0,0 @@
|
||||
( cmd arg1 arg2 -- r )
|
||||
( Send a command that expects a R1 response, handling CS. )
|
||||
: SDCMDR1 _sdcSel _cmd _sdcDesel ;
|
||||
|
||||
( cmd arg1 arg2 -- r arg1 arg2 )
|
||||
( Send a command that expects a R7 response, handling CS. A R7
|
||||
is a R1 followed by 4 bytes. arg1 contains bytes 0:1, arg2
|
||||
has 2:3 )
|
||||
: SDCMDR7
|
||||
_sdcSel
|
||||
_cmd ( r )
|
||||
_idle 256 * _idle + ( r arg1 )
|
||||
_idle 256 * _idle + ( r arg1 arg2 )
|
||||
_sdcDesel
|
||||
;
|
||||
|
||||
16
blk/380
16
blk/380
@ -1,16 +0,0 @@
|
||||
: _err _sdcDesel ABORT" SDerr" ;
|
||||
|
||||
( Initialize a SD card. This should be called at least 1ms
|
||||
after the powering up of the card. )
|
||||
: SDC$
|
||||
( Wake the SD card up. After power up, a SD card has to receive
|
||||
at least 74 dummy clocks with CS and DI high. We send 80. )
|
||||
10 0 DO _idle DROP LOOP
|
||||
( call cmd0 and expect a 0x01 response (card idle)
|
||||
this should be called multiple times. we're actually
|
||||
expected to. let's call this for a maximum of 10 times. )
|
||||
0 ( dummy )
|
||||
10 0 DO ( r )
|
||||
DROP 0x40 0 0 SDCMDR1 ( CMD0 )
|
||||
DUP 0x01 = IF LEAVE THEN
|
||||
LOOP 0x01 = NOT IF _err THEN ( cont. )
|
||||
10
blk/381
10
blk/381
@ -1,10 +0,0 @@
|
||||
( Then comes the CMD8. We send it with a 0x01aa argument and
|
||||
expect a 0x01aa argument back, along with a 0x01 R1
|
||||
response. )
|
||||
0x48 0 0x1aa ( CMD8 )
|
||||
SDCMDR7 ( r arg1 arg2 )
|
||||
0x1aa = NOT IF _err THEN ( arg2 check )
|
||||
0 = NOT IF _err THEN ( arg1 check )
|
||||
0x01 = NOT IF _err THEN ( r check )
|
||||
|
||||
( cont. )
|
||||
13
blk/382
13
blk/382
@ -1,13 +0,0 @@
|
||||
( Now we need to repeatedly run CMD55+CMD41 (0x40000000)
|
||||
until the card goes out of idle mode, that is, when it stops
|
||||
sending us 0x01 response and send us 0x00 instead. Any other
|
||||
response means that initialization failed. )
|
||||
BEGIN
|
||||
0x77 0 0 SDCMDR1 ( CMD55 )
|
||||
0x01 = NOT IF _err THEN
|
||||
0x69 0x4000 0x0000 SDCMDR1 ( CMD41 )
|
||||
DUP 0x01 > IF _err THEN
|
||||
NOT UNTIL
|
||||
( Out of idle mode! Success! )
|
||||
;
|
||||
|
||||
15
blk/383
15
blk/383
@ -1,15 +0,0 @@
|
||||
: _sdc@ ( dstaddr blkno -- )
|
||||
_sdcSel 0x51 ( CMD17 ) 0 ROT ( a cmd 0 blkno ) _cmd
|
||||
IF _err THEN
|
||||
_wait 0xfe = NOT IF _err THEN
|
||||
0 SWAP ( crc a )
|
||||
512 0 DO ( crc a )
|
||||
DUP _idle ( crc a a n )
|
||||
DUP ROT C! ( crc a n )
|
||||
ROT SWAP _crc16 ( a crc )
|
||||
SWAP 1+ ( crc a+1 )
|
||||
LOOP
|
||||
DROP ( crc1 )
|
||||
_idle 256 * _idle + ( crc2 )
|
||||
_wait DROP _sdcDesel
|
||||
= NOT IF _err THEN ;
|
||||
7
blk/384
7
blk/384
@ -1,7 +0,0 @@
|
||||
: SDC@
|
||||
2 * DUP BLK( SWAP ( b a b )
|
||||
_sdc@
|
||||
1+ BLK( 512 + SWAP
|
||||
_sdc@
|
||||
;
|
||||
|
||||
16
blk/385
16
blk/385
@ -1,16 +0,0 @@
|
||||
: _sdc! ( srcaddr blkno -- )
|
||||
_sdcSel 0x58 ( CMD24 ) 0 ROT ( a cmd 0 blkno ) _cmd
|
||||
IF _err THEN
|
||||
_idle DROP 0xfe _sdcSR DROP
|
||||
0 SWAP ( crc a )
|
||||
512 0 DO ( crc a )
|
||||
C@+ ( crc a+1 n )
|
||||
ROT OVER ( a n crc n )
|
||||
_crc16 ( a n crc )
|
||||
SWAP ( a crc n )
|
||||
_sdcSR DROP ( a crc )
|
||||
SWAP ( crc a )
|
||||
LOOP
|
||||
DROP ( crc ) 256 /MOD ( lsb msb )
|
||||
_sdcSR DROP _sdcSR DROP
|
||||
_wait DROP _sdcDesel ;
|
||||
7
blk/386
7
blk/386
@ -1,7 +0,0 @@
|
||||
: SDC!
|
||||
2 * DUP BLK( SWAP ( b a b )
|
||||
_sdc!
|
||||
1+ BLK( 512 + SWAP
|
||||
_sdc!
|
||||
;
|
||||
|
||||
16
blk/390
16
blk/390
@ -1,16 +0,0 @@
|
||||
Inner core
|
||||
|
||||
This unit represents core definitions that happen right after
|
||||
native definitions. Before core.fs.
|
||||
|
||||
Unlike core.fs and its followers, this unit isn't self-
|
||||
sustained. Like native defs it uses the machinery of a full
|
||||
Forth interpreter, notably for flow structures.
|
||||
|
||||
Because of that, it has to obey specific rules:
|
||||
|
||||
1. It cannot compile a word from higher layers. Using
|
||||
immediates is fine though.
|
||||
|
||||
|
||||
(cont.)
|
||||
16
blk/391
16
blk/391
@ -1,16 +0,0 @@
|
||||
2. If it references a word from this unit or from native
|
||||
definitions, these need to be properly offsetted because
|
||||
their offset at compile time are not the same as their
|
||||
runtime offsets.
|
||||
3. Anything they refer to in the boot binary has to be properly
|
||||
stabilized.
|
||||
4. Make sure that the words you compile are not overridden by
|
||||
the full interpreter.
|
||||
5. When using words as immediates, make sure that they're not
|
||||
defined in icore or, if they are, make sure that they are
|
||||
*not* offsetted
|
||||
|
||||
|
||||
|
||||
|
||||
(cont.)
|
||||
7
blk/392
7
blk/392
@ -1,7 +0,0 @@
|
||||
Those rules are mostly met by the "xcomp" unit, which is
|
||||
expected to have been loaded prior to icore and redefines ":"
|
||||
and other defining words. So, in other words, when compiling
|
||||
icore, ":" doesn't means what you think it means, go look in
|
||||
B260.
|
||||
|
||||
To load, run "393 LOAD".
|
||||
15
blk/393
15
blk/393
@ -1,15 +0,0 @@
|
||||
: RAM+ [ RAMSTART LITN ] + ;
|
||||
: FLAGS 0x08 RAM+ ;
|
||||
: (parse*) 0x0a RAM+ ;
|
||||
: HERE 0x04 RAM+ ;
|
||||
: CURRENT* 0x51 RAM+ ;
|
||||
: CURRENT CURRENT* @ ;
|
||||
|
||||
( w -- a f )
|
||||
: (find) CURRENT @ SWAP _find ;
|
||||
|
||||
: QUIT
|
||||
0 FLAGS ! (resRS)
|
||||
LIT< INTERPRET (find) DROP EXECUTE
|
||||
;
|
||||
394 407 LOADR
|
||||
8
blk/394
8
blk/394
@ -1,8 +0,0 @@
|
||||
: ABORT (resSP) QUIT ;
|
||||
|
||||
: = CMP NOT ;
|
||||
: < CMP -1 = ;
|
||||
: > CMP 1 = ;
|
||||
: 0< 32767 > ;
|
||||
|
||||
|
||||
15
blk/395
15
blk/395
@ -1,15 +0,0 @@
|
||||
( r c -- r f )
|
||||
( Parse digit c and accumulate into result r.
|
||||
Flag f is 0 when c was a valid digit, 1 when c was WS,
|
||||
-1 when c was an invalid digit. )
|
||||
: _pdacc
|
||||
DUP 0x21 < IF DROP 1 EXIT THEN
|
||||
( parse char )
|
||||
'0' -
|
||||
( if bad, return "r -1" )
|
||||
DUP 0< IF DROP -1 EXIT THEN ( bad )
|
||||
DUP 9 > IF DROP -1 EXIT THEN ( bad )
|
||||
( good, add to running result )
|
||||
SWAP 10 * + ( r*10+n )
|
||||
0 ( good )
|
||||
;
|
||||
11
blk/396
11
blk/396
@ -1,11 +0,0 @@
|
||||
( parsed is tight, all comments ahead. We read the first char
|
||||
outside of the loop because it *has* to be nonzero, which
|
||||
means _pdacc *has* to return 0.
|
||||
|
||||
Then, we check for '-'. If we get it, we advance by one,
|
||||
recurse and invert result.
|
||||
|
||||
We loop until _pdacc is nonzero, which means either WS or
|
||||
non-digit. 1 means WS, which means parsing was a success.
|
||||
-1 means non-digit, which means we have a non-decimal. )
|
||||
|
||||
16
blk/397
16
blk/397
@ -1,16 +0,0 @@
|
||||
: (parsed) ( a -- n f )
|
||||
DUP C@ ( a c )
|
||||
DUP '-' = IF
|
||||
DROP 1+ ( a+1 ) (parsed) 0 ROT ( f 0 n )
|
||||
- SWAP EXIT ( 0-n f )
|
||||
THEN
|
||||
0 SWAP _pdacc ( a r f )
|
||||
DUP IF 2DROP 0 EXIT THEN
|
||||
BEGIN ( a r 0 )
|
||||
DROP SWAP 1+ ( r a+1 )
|
||||
DUP C@ ( r a c )
|
||||
ROT SWAP ( a r c )
|
||||
_pdacc ( a r f )
|
||||
DUP UNTIL
|
||||
1 = ( a r f )
|
||||
ROT DROP ( r f ) ;
|
||||
11
blk/398
11
blk/398
@ -1,11 +0,0 @@
|
||||
( This is only the "early parser" in earlier stages. No need
|
||||
for an abort message )
|
||||
: (parse) (parsed) NOT IF ABORT THEN ;
|
||||
|
||||
: C< 0x0c RAM+ @ EXECUTE ( 0c == CINPTR ) ;
|
||||
|
||||
: , HERE @ ! HERE @ 2+ HERE ! ;
|
||||
|
||||
: C, HERE @ C! HERE @ 1+ HERE ! ;
|
||||
|
||||
|
||||
12
blk/399
12
blk/399
@ -1,12 +0,0 @@
|
||||
( The NOT is to normalize the negative/positive numbers to 1
|
||||
or 0. Hadn't we wanted to normalize, we'd have written:
|
||||
32 CMP 1 - )
|
||||
: WS? 33 CMP 1+ NOT ;
|
||||
|
||||
: TOWORD
|
||||
BEGIN
|
||||
C< DUP WS? NOT IF EXIT THEN DROP
|
||||
AGAIN
|
||||
;
|
||||
|
||||
|
||||
16
blk/400
16
blk/400
@ -1,16 +0,0 @@
|
||||
( Read word from C<, copy to WORDBUF, null-terminate, and
|
||||
return, make HL point to WORDBUF. )
|
||||
: WORD
|
||||
0x0e RAM+ ( 0e == WORDBUF )
|
||||
TOWORD ( a c )
|
||||
BEGIN
|
||||
( We take advantage of the fact that char MSB is
|
||||
always zero to pre-write our null-termination )
|
||||
OVER ! 1+ ( a+1 )
|
||||
C< ( a c )
|
||||
DUP WS?
|
||||
UNTIL
|
||||
( a this point, PS is: a WS )
|
||||
( null-termination is already written )
|
||||
2DROP
|
||||
0x0e RAM+ ;
|
||||
10
blk/401
10
blk/401
@ -1,10 +0,0 @@
|
||||
: SCPY
|
||||
BEGIN ( a )
|
||||
DUP C@ ( a c )
|
||||
DUP C, ( a c )
|
||||
NOT IF DROP EXIT THEN
|
||||
1+ ( a+1 )
|
||||
AGAIN
|
||||
;
|
||||
|
||||
|
||||
15
blk/402
15
blk/402
@ -1,15 +0,0 @@
|
||||
: [entry]
|
||||
HERE @ ( w h )
|
||||
SWAP SCPY ( h )
|
||||
( Adjust HERE -1 because SCPY copies the null )
|
||||
HERE @ 1- ( h h' )
|
||||
DUP HERE ! ( h h' )
|
||||
SWAP - ( sz )
|
||||
( write prev value )
|
||||
HERE @ CURRENT @ - ,
|
||||
( write size )
|
||||
C,
|
||||
HERE @ CURRENT !
|
||||
;
|
||||
|
||||
: (entry) WORD [entry] ;
|
||||
14
blk/403
14
blk/403
@ -1,14 +0,0 @@
|
||||
: INTERPRET
|
||||
BEGIN
|
||||
WORD
|
||||
(find)
|
||||
IF
|
||||
1 FLAGS !
|
||||
EXECUTE
|
||||
0 FLAGS !
|
||||
ELSE
|
||||
(parse*) @ EXECUTE
|
||||
THEN
|
||||
AGAIN
|
||||
;
|
||||
|
||||
11
blk/404
11
blk/404
@ -1,11 +0,0 @@
|
||||
( system c< simply reads source from binary, starting at
|
||||
LATEST. Convenient way to bootstrap a new system. )
|
||||
: (boot<)
|
||||
( 2e == BOOT C< PTR )
|
||||
0x2e RAM+ @ ( a )
|
||||
DUP C@ ( a c )
|
||||
SWAP 1 + ( c a+1 )
|
||||
0x2e RAM+ ! ( c )
|
||||
;
|
||||
|
||||
|
||||
12
blk/405
12
blk/405
@ -1,12 +0,0 @@
|
||||
: BOOT
|
||||
0x02 RAM+ CURRENT* !
|
||||
LIT< (parse) (find) DROP (parse*) !
|
||||
( 2e == SYSTEM SCRATCHPAD )
|
||||
CURRENT @ 0x2e RAM+ !
|
||||
( 0c == CINPTR )
|
||||
LIT< (boot<) (find) DROP 0x0c RAM+ !
|
||||
LIT< INIT (find)
|
||||
IF EXECUTE
|
||||
ELSE DROP INTERPRET THEN
|
||||
;
|
||||
|
||||
14
blk/406
14
blk/406
@ -1,14 +0,0 @@
|
||||
( LITN has to be defined after the last immediate usage of
|
||||
it to avoid bootstrapping issues )
|
||||
: LITN 32 , , ( 32 == NUMBER ) ;
|
||||
|
||||
: IMMED? 1- C@ 0x80 AND ;
|
||||
|
||||
( ';' can't have its name right away because, when created, it
|
||||
is not an IMMEDIATE yet and will not be treated properly by
|
||||
xcomp. )
|
||||
: _
|
||||
['] EXIT ,
|
||||
R> DROP ( exit : )
|
||||
; IMMEDIATE
|
||||
|
||||
16
blk/407
16
blk/407
@ -1,16 +0,0 @@
|
||||
XCURRENT @ ( to PSP )
|
||||
: :
|
||||
(entry)
|
||||
( We cannot use LITN as IMMEDIATE because of bootstrapping
|
||||
issues. Same thing for ",".
|
||||
32 == NUMBER 14 == compiledWord )
|
||||
[ 32 H@ ! 2 ALLOT 14 H@ ! 2 ALLOT ] C,
|
||||
BEGIN
|
||||
WORD
|
||||
(find)
|
||||
( is word )
|
||||
IF DUP IMMED? IF EXECUTE ELSE , THEN
|
||||
( maybe number )
|
||||
ELSE (parse*) @ EXECUTE LITN THEN
|
||||
AGAIN ;
|
||||
( from PSP ) ';' SWAP 4 - C!
|
||||
60
drv/acia.z80
Normal file
60
drv/acia.z80
Normal file
@ -0,0 +1,60 @@
|
||||
( Save ACIA conf )
|
||||
ACIA_CTL
|
||||
: ACIA_CTL [ LITN ] ;
|
||||
ACIA_IO
|
||||
: ACIA_IO [ LITN ] ;
|
||||
ACIA_MEM
|
||||
: ACIA_MEM [ LITN ] ;
|
||||
( Memory layout
|
||||
+0 ACIAR>
|
||||
+2 ACIAW>
|
||||
+4 ACIA(
|
||||
+6 ACIA)
|
||||
)
|
||||
|
||||
(xentry) ~ACIA
|
||||
AF PUSHqq,
|
||||
HL PUSHqq,
|
||||
DE PUSHqq,
|
||||
|
||||
( Read our character from ACIA into our BUFIDX )
|
||||
ACIA_CTL INAn,
|
||||
0x01 ANDn, ( is ACIA rcv buf full? )
|
||||
IFNZ,
|
||||
( correct interrupt cause )
|
||||
( +2 == ACIAW> )
|
||||
ACIA_MEM 2+ LDHL(nn),
|
||||
( is it == to ACIAR>? )
|
||||
( +0 == ACIAR> )
|
||||
DE ACIA_MEM LDdd(nn),
|
||||
( carry cleared from ANDn above )
|
||||
DE SBCHLss,
|
||||
IFNZ, ( buffer full? )
|
||||
( no, continue )
|
||||
DE ADDHLss, ( restore ACIAW> )
|
||||
( buffer not full, let's write )
|
||||
ACIA_IO INAn,
|
||||
(HL) A LDrr,
|
||||
|
||||
( advance W> )
|
||||
HL INCss,
|
||||
( +2 == ACIAW> )
|
||||
ACIA_MEM 2+ LD(nn)HL,
|
||||
( +6 == ACIA) )
|
||||
DE ACIA_MEM 6 + LDdd(nn),
|
||||
DE SUBHLss,
|
||||
IFZ, ( end of buffer reached? )
|
||||
( yes )
|
||||
( +4 == ACIA( )
|
||||
ACIA_MEM 4 + LDHL(nn),
|
||||
( +2 == ACIAW> )
|
||||
ACIA_MEM 2+ LD(nn)HL,
|
||||
THEN,
|
||||
THEN,
|
||||
THEN,
|
||||
|
||||
DE POPqq,
|
||||
HL POPqq,
|
||||
AF POPqq,
|
||||
EI,
|
||||
RETI,
|
||||
@ -1,6 +1,7 @@
|
||||
( n -- n )
|
||||
( Initiate SPI exchange with the SD card. n is the data to
|
||||
send. )
|
||||
CODE _sdcSR ( n -- n )
|
||||
CODE _sdcSR
|
||||
HL POPqq,
|
||||
chkPS,
|
||||
A L LDrr,
|
||||
@ -11,4 +12,10 @@ CODE _sdcSR ( n -- n )
|
||||
HL PUSHqq,
|
||||
;CODE
|
||||
|
||||
373 LOAD
|
||||
CODE _sdcSel
|
||||
SDC_CSLOW OUTnA,
|
||||
;CODE
|
||||
|
||||
CODE _sdcDesel
|
||||
SDC_CSHIGH OUTnA,
|
||||
;CODE
|
||||
@ -1,5 +1,10 @@
|
||||
TARGETS = forth/forth forth/stage2
|
||||
TARGETS = forth/forth
|
||||
# Those Forth source files are in a particular order
|
||||
BOOTSRCS = ./forth/conf.fs \
|
||||
./forth/xcomp.fs \
|
||||
../forth/icore.fs \
|
||||
./forth/xstop.fs
|
||||
|
||||
FORTHSRCS = core.fs cmp.fs print.fs parse.fs readln.fs fmt.fs blk.fs
|
||||
FORTHSRC_PATHS = ${FORTHSRCS:%=../forth/%} forth/run.fs
|
||||
OBJS = emul.o libz80/libz80.o
|
||||
@ -71,7 +76,7 @@ emul.o: emul.c
|
||||
|
||||
.PHONY: updatebootstrap
|
||||
updatebootstrap: forth/stage2
|
||||
cat ./forth/xcomp.fs | ./forth/stage2 > ./forth/z80c.bin
|
||||
cat $(BOOTSRCS) | ./forth/stage2 > ./forth/z80c.bin
|
||||
|
||||
.PHONY: pack
|
||||
pack:
|
||||
|
||||
3
emul/forth/conf.fs
Normal file
3
emul/forth/conf.fs
Normal file
@ -0,0 +1,3 @@
|
||||
212 LOAD ( z80 assembler )
|
||||
0xe800 CONSTANT RAMSTART
|
||||
0xf000 CONSTANT RS_ADDR
|
||||
@ -1,10 +1,6 @@
|
||||
0xe800 CONSTANT RAMSTART
|
||||
0xf000 CONSTANT RS_ADDR
|
||||
212 LOAD ( z80 assembler )
|
||||
262 LOAD ( xcomp )
|
||||
: CODE XCODE ;
|
||||
: IMMEDIATE XIMM ;
|
||||
: (entry) (xentry) ;
|
||||
: : [ ' X: , ] ;
|
||||
|
||||
CURRENT @ XCURRENT !
|
||||
@ -12,6 +8,3 @@ CURRENT @ XCURRENT !
|
||||
H@ 256 /MOD 2 PC! 2 PC!
|
||||
H@ XOFF !
|
||||
282 LOAD ( boot.z80 )
|
||||
393 LOAD ( icore )
|
||||
(entry) _
|
||||
H@ 256 /MOD 2 PC! 2 PC!
|
||||
|
||||
3
emul/forth/xstop.fs
Normal file
3
emul/forth/xstop.fs
Normal file
@ -0,0 +1,3 @@
|
||||
(xentry) _
|
||||
H@ 256 /MOD 2 PC! 2 PC!
|
||||
|
||||
252
forth/icore.fs
Normal file
252
forth/icore.fs
Normal file
@ -0,0 +1,252 @@
|
||||
( Inner core. This unit represents core definitions that
|
||||
happen right after native definitions. Before core.fs.
|
||||
|
||||
Unlike core.fs and its followers, this unit isn't self-
|
||||
sustained. Like native defs it uses the machinery of a
|
||||
full Forth interpreter, notably for flow structures.
|
||||
|
||||
Because of that, it has to obey specific rules:
|
||||
|
||||
1. It cannot compile a word from higher layers. Using
|
||||
immediates is fine though.
|
||||
2. If it references a word from this unit or from native
|
||||
definitions, these need to be properly offsetted
|
||||
because their offset at compile time are not the same
|
||||
as their runtime offsets.
|
||||
3. Anything they refer to in the boot binary has to be
|
||||
properly stabilized.
|
||||
4. Make sure that the words you compile are not overridden
|
||||
by the full interpreter.
|
||||
5. When using words as immediates, make sure that they're
|
||||
not defined in icore or, if they are, make sure that
|
||||
they are *not* offsetted
|
||||
|
||||
Those rules are mostly met by the "xcomp" unit, which is
|
||||
expected to have been loaded prior to icore and redefines
|
||||
":" and other defining words. So, in other words, when
|
||||
compiling icore, ":" doesn't means what you think it means,
|
||||
go look in B260.
|
||||
)
|
||||
|
||||
: RAM+
|
||||
[ RAMSTART LITN ] +
|
||||
;
|
||||
|
||||
: FLAGS 0x08 RAM+ ;
|
||||
: (parse*) 0x0a RAM+ ;
|
||||
: HERE 0x04 RAM+ ;
|
||||
: CURRENT* 0x51 RAM+ ;
|
||||
: CURRENT CURRENT* @ ;
|
||||
|
||||
( w -- a f )
|
||||
: (find) CURRENT @ SWAP _find ;
|
||||
|
||||
: QUIT
|
||||
0 FLAGS ! (resRS)
|
||||
LIT< INTERPRET (find) DROP EXECUTE
|
||||
;
|
||||
|
||||
: ABORT (resSP) QUIT ;
|
||||
|
||||
: = CMP NOT ;
|
||||
: < CMP -1 = ;
|
||||
: > CMP 1 = ;
|
||||
: 0< 32767 > ;
|
||||
|
||||
( r c -- r f )
|
||||
( Parse digit c and accumulate into result r.
|
||||
Flag f is 0 when c was a valid digit, 1 when c was WS,
|
||||
-1 when c was an invalid digit. )
|
||||
: _pdacc
|
||||
DUP 0x21 < IF DROP 1 EXIT THEN
|
||||
( parse char )
|
||||
'0' -
|
||||
( if bad, return "r -1" )
|
||||
DUP 0< IF DROP -1 EXIT THEN ( bad )
|
||||
DUP 9 > IF DROP -1 EXIT THEN ( bad )
|
||||
( good, add to running result )
|
||||
SWAP 10 * + ( r*10+n )
|
||||
0 ( good )
|
||||
;
|
||||
|
||||
: (parsed) ( a -- n f )
|
||||
( read first char outside of the loop. it *has* to be
|
||||
nonzero. )
|
||||
DUP C@ ( a c )
|
||||
( special case: do we have a negative? )
|
||||
DUP '-' = IF
|
||||
( Oh, a negative, let's recurse and reverse )
|
||||
DROP 1+ ( a+1 )
|
||||
(parsed) ( n f )
|
||||
0 ROT ( f 0 n )
|
||||
- SWAP EXIT ( 0-n f )
|
||||
THEN
|
||||
( running result from first char )
|
||||
0 SWAP ( a r c )
|
||||
_pdacc ( a r f )
|
||||
DUP IF
|
||||
( first char was not a valid digit )
|
||||
2DROP 0 EXIT ( a 0 )
|
||||
THEN
|
||||
BEGIN ( a r 0 )
|
||||
DROP SWAP 1+ ( r a+1 )
|
||||
DUP C@ ( r a c )
|
||||
ROT SWAP ( a r c )
|
||||
_pdacc ( a r f )
|
||||
DUP UNTIL
|
||||
( a r f -- f is 1 on success, -1 on error, normalize
|
||||
to bool. )
|
||||
1 = ( a r f )
|
||||
( we want "r f" )
|
||||
ROT DROP
|
||||
;
|
||||
|
||||
( This is only the "early parser" in earlier stages. No need
|
||||
for an abort message )
|
||||
: (parse)
|
||||
(parsed) NOT IF ABORT THEN
|
||||
;
|
||||
|
||||
: C<
|
||||
( 0c == CINPTR )
|
||||
0x0c RAM+ @ EXECUTE
|
||||
;
|
||||
|
||||
: ,
|
||||
HERE @ !
|
||||
HERE @ 2+ HERE !
|
||||
;
|
||||
|
||||
: C,
|
||||
HERE @ C!
|
||||
HERE @ 1+ HERE !
|
||||
;
|
||||
|
||||
( The NOT is to normalize the negative/positive numbers to 1
|
||||
or 0. Hadn't we wanted to normalize, we'd have written:
|
||||
32 CMP 1 - )
|
||||
: WS? 33 CMP 1+ NOT ;
|
||||
|
||||
: TOWORD
|
||||
BEGIN
|
||||
C< DUP WS? NOT IF EXIT THEN DROP
|
||||
AGAIN
|
||||
;
|
||||
|
||||
( Read word from C<, copy to WORDBUF, null-terminate, and
|
||||
return, make HL point to WORDBUF. )
|
||||
: WORD
|
||||
( 0e == WORDBUF )
|
||||
0x0e RAM+ ( a )
|
||||
TOWORD ( a c )
|
||||
BEGIN
|
||||
( We take advantage of the fact that char MSB is
|
||||
always zero to pre-write our null-termination )
|
||||
OVER ! ( a )
|
||||
1+ ( a+1 )
|
||||
C< ( a c )
|
||||
DUP WS?
|
||||
UNTIL
|
||||
( a this point, PS is: a WS )
|
||||
( null-termination is already written )
|
||||
2DROP
|
||||
0x0e RAM+
|
||||
;
|
||||
|
||||
: SCPY
|
||||
BEGIN ( a )
|
||||
DUP C@ ( a c )
|
||||
DUP C, ( a c )
|
||||
NOT IF DROP EXIT THEN
|
||||
1+ ( a+1 )
|
||||
AGAIN
|
||||
;
|
||||
|
||||
: [entry]
|
||||
HERE @ ( w h )
|
||||
SWAP SCPY ( h )
|
||||
( Adjust HERE -1 because SCPY copies the null )
|
||||
HERE @ 1- ( h h' )
|
||||
DUP HERE ! ( h h' )
|
||||
SWAP - ( sz )
|
||||
( write prev value )
|
||||
HERE @ CURRENT @ - ,
|
||||
( write size )
|
||||
C,
|
||||
HERE @ CURRENT !
|
||||
;
|
||||
|
||||
: (entry) WORD [entry] ;
|
||||
|
||||
: INTERPRET
|
||||
BEGIN
|
||||
WORD
|
||||
(find)
|
||||
IF
|
||||
1 FLAGS !
|
||||
EXECUTE
|
||||
0 FLAGS !
|
||||
ELSE
|
||||
(parse*) @ EXECUTE
|
||||
THEN
|
||||
AGAIN
|
||||
;
|
||||
|
||||
( system c< simply reads source from binary, starting at
|
||||
LATEST. Convenient way to bootstrap a new system. )
|
||||
: (boot<)
|
||||
( 2e == BOOT C< PTR )
|
||||
0x2e RAM+ @ ( a )
|
||||
DUP C@ ( a c )
|
||||
SWAP 1 + ( c a+1 )
|
||||
0x2e RAM+ ! ( c )
|
||||
;
|
||||
|
||||
: BOOT
|
||||
0x02 RAM+ CURRENT* !
|
||||
LIT< (parse) (find) DROP (parse*) !
|
||||
( 2e == SYSTEM SCRATCHPAD )
|
||||
CURRENT @ 0x2e RAM+ !
|
||||
( 0c == CINPTR )
|
||||
LIT< (boot<) (find) DROP 0x0c RAM+ !
|
||||
LIT< INIT (find)
|
||||
IF EXECUTE
|
||||
ELSE DROP INTERPRET THEN
|
||||
;
|
||||
|
||||
( LITN has to be defined after the last immediate usage of
|
||||
it to avoid bootstrapping issues )
|
||||
: LITN
|
||||
( 32 == NUMBER )
|
||||
32 , ,
|
||||
;
|
||||
|
||||
: IMMED? 1- C@ 0x80 AND ;
|
||||
|
||||
( ';' can't have its name right away because, when created, it
|
||||
is not an IMMEDIATE yet and will not be treated properly by
|
||||
xcomp. )
|
||||
: _
|
||||
['] EXIT ,
|
||||
R> DROP ( exit : )
|
||||
; IMMEDIATE
|
||||
|
||||
XCURRENT @ ( to PSP )
|
||||
|
||||
: :
|
||||
(entry)
|
||||
( We cannot use LITN as IMMEDIATE because of bootstrapping
|
||||
issues. Same thing for ",".
|
||||
32 == NUMBER 14 == compiledWord )
|
||||
[ 32 H@ ! 2 ALLOT 14 H@ ! 2 ALLOT ] C,
|
||||
BEGIN
|
||||
WORD
|
||||
(find)
|
||||
( is word )
|
||||
IF DUP IMMED? IF EXECUTE ELSE , THEN
|
||||
( maybe number )
|
||||
ELSE (parse*) @ EXECUTE LITN THEN
|
||||
AGAIN
|
||||
;
|
||||
|
||||
( from PSP ) ';' SWAP 4 - C!
|
||||
@ -4,6 +4,12 @@ FDIR = $(BASEDIR)/forth
|
||||
EDIR = $(BASEDIR)/emul/forth
|
||||
STAGE2 = $(EDIR)/stage2
|
||||
EMUL = $(BASEDIR)/emul/hw/rc2014/classic
|
||||
BOOTSRCS = conf.fs \
|
||||
$(EDIR)/xcomp.fs \
|
||||
$(BASEDIR)/drv/acia.z80 \
|
||||
$(BASEDIR)/drv/sdc.z80 \
|
||||
$(FDIR)/icore.fs \
|
||||
$(EDIR)/xstop.fs
|
||||
|
||||
PATHS = \
|
||||
$(FDIR)/core.fs \
|
||||
@ -24,8 +30,8 @@ $(TARGET): z80c.bin $(SLATEST) $(PATHS)
|
||||
$(SLATEST) $@
|
||||
cat $(PATHS) | $(STRIPFC) >> $@
|
||||
|
||||
z80c.bin: xcomp.fs
|
||||
cat xcomp.fs | $(STAGE2) > $@
|
||||
z80c.bin: conf.fs
|
||||
cat $(BOOTSRCS) | $(STAGE2) > $@
|
||||
|
||||
$(SLATEST):
|
||||
$(MAKE) -C $(BASEDIR)/tools
|
||||
|
||||
10
recipes/rc2014/conf.fs
Normal file
10
recipes/rc2014/conf.fs
Normal file
@ -0,0 +1,10 @@
|
||||
212 LOAD ( z80a )
|
||||
0x8000 CONSTANT RAMSTART
|
||||
0xf000 CONSTANT RS_ADDR
|
||||
0x80 CONSTANT ACIA_CTL
|
||||
0x81 CONSTANT ACIA_IO
|
||||
4 CONSTANT SDC_SPI
|
||||
5 CONSTANT SDC_CSLOW
|
||||
6 CONSTANT SDC_CSHIGH
|
||||
RAMSTART 0x70 + CONSTANT ACIA_MEM
|
||||
|
||||
@ -1,25 +0,0 @@
|
||||
0x8000 CONSTANT RAMSTART
|
||||
0xf000 CONSTANT RS_ADDR
|
||||
0x80 CONSTANT ACIA_CTL
|
||||
0x81 CONSTANT ACIA_IO
|
||||
4 CONSTANT SDC_SPI
|
||||
5 CONSTANT SDC_CSLOW
|
||||
6 CONSTANT SDC_CSHIGH
|
||||
RAMSTART 0x70 + CONSTANT ACIA_MEM
|
||||
212 LOAD ( z80 assembler )
|
||||
262 LOAD ( xcomp )
|
||||
: CODE XCODE ;
|
||||
: IMMEDIATE XIMM ;
|
||||
: (entry) (xentry) ;
|
||||
: : [ ' X: , ] ;
|
||||
|
||||
CURRENT @ XCURRENT !
|
||||
|
||||
H@ 256 /MOD 2 PC! 2 PC!
|
||||
H@ XOFF !
|
||||
282 LOAD ( boot.z80 )
|
||||
352 LOAD ( acia.z80 )
|
||||
372 LOAD ( sdc.z80 )
|
||||
393 LOAD ( icore )
|
||||
(entry) _
|
||||
H@ 256 /MOD 2 PC! 2 PC!
|
||||
Loading…
Reference in New Issue
Block a user