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Author | SHA1 | Date | |
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a19376df6c | ||
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dd6ce1b8fe |
4
blk/001
4
blk/001
@ -3,8 +3,8 @@ MASTER INDEX
|
||||
3 Usage 30 Dictionary
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||||
70 Implementation notes 100 Block editor
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||||
200 Z80 assembler 260 Cross compilation
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||||
280 Z80 boot code
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||||
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||||
280 Z80 boot code 350 ACIA driver
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||||
370 SD Card driver 390 Inner core
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||||
|
||||
|
||||
|
||||
|
15
blk/350
Normal file
15
blk/350
Normal file
@ -0,0 +1,15 @@
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||||
ACIA driver
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||||
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Manage I/O from an asynchronous communication interface adapter
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||||
(ACIA). provides "EMIT" to put c char on the ACIA as well as
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||||
an input buffer. You have to call "~ACIA" on interrupt for
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||||
this module to work well.
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||||
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||||
CONFIGURATION
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||||
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||||
ACIA_CTL: IO port for the ACIA's control registers
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||||
ACIA_IO: IO port for the ACIA's data registers
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ACIA_MEM: Address in memory that can be used variables shared
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||||
with ACIA's native words. 8 bytes used.
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||||
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||||
Load z80 words with "352 LOAD" and Forth words with "357 LOAD".
|
15
blk/352
Normal file
15
blk/352
Normal file
@ -0,0 +1,15 @@
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( 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(
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+6 ACIA) )
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353 356 LOADR
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|
16
blk/353
Normal file
16
blk/353
Normal file
@ -0,0 +1,16 @@
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(entry) ~ACIA
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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 )
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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. )
|
16
blk/354
Normal file
16
blk/354
Normal file
@ -0,0 +1,16 @@
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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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( cont. )
|
16
blk/356
Normal file
16
blk/356
Normal file
@ -0,0 +1,16 @@
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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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|
14
blk/357
Normal file
14
blk/357
Normal file
@ -0,0 +1,14 @@
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0x20 CONSTANT ACIABUFSZ
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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 )
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: 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.
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If R>+1 == W>, buffer is empty. )
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358 360 LOADR
|
16
blk/358
Normal file
16
blk/358
Normal file
@ -0,0 +1,16 @@
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: ACIA$
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H@ DUP DUP ACIA( ! ACIAR> !
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1+ ACIAW> ! ( write index starts one position later )
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ACIABUFSZ ALLOT
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H@ ACIA) !
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( setup ACIA
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CR7 (1) - Receive Interrupt enabled
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CR6:5 (00) - RTS low, transmit interrupt disabled.
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CR4:2 (101) - 8 bits + 1 stop bit
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CR1:0 (10) - Counter divide: 64 )
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0b10010110 ACIA_CTL PC!
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( setup interrupt )
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0xc3 0x4e RAM+ C! ( c3==JP, 4e==INTJUMP )
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['] ~ACIA 0x4f RAM+ !
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(im1)
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;
|
14
blk/359
Normal file
14
blk/359
Normal file
@ -0,0 +1,14 @@
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: KEY
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( inc then fetch )
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ACIAR> @ 1+ DUP ACIA) @ = IF
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DROP ACIA( @
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THEN
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( As long as R> == W>-1, it means that buffer is empty )
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BEGIN DUP ACIAW> @ = NOT UNTIL
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ACIAR> !
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ACIAR> @ C@
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;
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|
7
blk/360
Normal file
7
blk/360
Normal file
@ -0,0 +1,7 @@
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: EMIT
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( As long at CTL bit 1 is low, we are transmitting. wait )
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BEGIN ACIA_CTL PC@ 0x02 AND UNTIL
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( The way is clear, go! )
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ACIA_IO PC!
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;
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|
4
blk/370
Normal file
4
blk/370
Normal file
@ -0,0 +1,4 @@
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SD Card driver
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Load the z80 part with "372 LOAD", the Forth part with
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"374 LOAD".
|
@ -1,7 +1,6 @@
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( n -- n )
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( Initiate SPI exchange with the SD card. n is the data to
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send. )
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CODE _sdcSR
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CODE _sdcSR ( n -- n )
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HL POPqq,
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chkPS,
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A L LDrr,
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@ -12,10 +11,4 @@ CODE _sdcSR
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HL PUSHqq,
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;CODE
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CODE _sdcSel
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SDC_CSLOW OUTnA,
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;CODE
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CODE _sdcDesel
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SDC_CSHIGH OUTnA,
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;CODE
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||||
373 LOAD
|
9
blk/373
Normal file
9
blk/373
Normal file
@ -0,0 +1,9 @@
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||||
CODE _sdcSel
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SDC_CSLOW OUTnA,
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;CODE
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||||
CODE _sdcDesel
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SDC_CSHIGH OUTnA,
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;CODE
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|
16
blk/374
Normal file
16
blk/374
Normal file
@ -0,0 +1,16 @@
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||||
( -- n )
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||||
: _idle 0xff _sdcSR ;
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( -- n )
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( _sdcSR 0xff until the response is something else than 0xff
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for a maximum of 20 times. Returns 0xff if no response. )
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: _wait
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0 ( cnt )
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BEGIN
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_idle
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DUP 0xff = IF DROP ELSE SWAP DROP EXIT THEN
|
||||
1+
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DUP 20 = UNTIL
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DROP 0xff
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||||
;
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375 386 LOADR
|
10
blk/375
Normal file
10
blk/375
Normal file
@ -0,0 +1,10 @@
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||||
( -- )
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||||
( The opposite of sdcWaitResp: we wait until response is 0xff.
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||||
After a successful read or write operation, the card will be
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||||
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,
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||||
but at the moment, I'm having random write errors if I don't
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||||
do this right after a write, so I prefer to stay cautious
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||||
for now. )
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||||
: _ready BEGIN _idle 0xff = UNTIL ;
|
16
blk/376
Normal file
16
blk/376
Normal file
@ -0,0 +1,16 @@
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||||
( c n -- c )
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||||
( Computes n into crc c with polynomial 0x09
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Note that the result is "left aligned", that is, that 8th
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bit to the "right" is insignificant (will be stop bit). )
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: _crc7
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XOR ( c )
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8 0 DO
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2 * ( <<1 )
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DUP 255 > IF
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( MSB was set, apply polynomial )
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0xff AND
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0x12 XOR ( 0x09 << 1, we apply CRC on high bits )
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||||
THEN
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||||
LOOP
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||||
;
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||||
|
16
blk/377
Normal file
16
blk/377
Normal file
@ -0,0 +1,16 @@
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||||
( c n -- c )
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||||
( Computes n into crc c with polynomial 0x1021 )
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: _crc16
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SWAP DUP 256 / ( n c c>>8 )
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ROT XOR ( c x )
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DUP 16 / XOR ( c x^x>>4 )
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SWAP 256 * ( x c<<8 )
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||||
OVER 4096 * XOR ( x c^x<<12 )
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OVER 32 * XOR ( x c^x<<5 )
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XOR ( c )
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;
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( send-and-crc7 )
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( n c -- c )
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: _s+crc SWAP DUP _sdcSR DROP _crc7 ;
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|
16
blk/378
Normal file
16
blk/378
Normal file
@ -0,0 +1,16 @@
|
||||
( cmd arg1 arg2 -- resp )
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||||
( Sends a command to the SD card, along with arguments and
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||||
specified CRC fields. (CRC is only needed in initial commands
|
||||
though). This does *not* handle CS. You have to
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||||
select/deselect the card outside this routine. )
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: _cmd
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_wait DROP ROT ( a1 a2 cmd )
|
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0 _s+crc ( a1 a2 crc )
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||||
ROT 256 /MOD ROT ( a2 h l crc )
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_s+crc _s+crc ( a2 crc )
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SWAP 256 /MOD ROT ( h l crc )
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||||
_s+crc _s+crc ( crc )
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0x01 OR ( ensure stop bit )
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_sdcSR DROP ( send CRC )
|
||||
_wait ( wait for a valid response... )
|
||||
;
|
16
blk/379
Normal file
16
blk/379
Normal file
@ -0,0 +1,16 @@
|
||||
( cmd arg1 arg2 -- r )
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||||
( 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
Normal file
16
blk/380
Normal file
@ -0,0 +1,16 @@
|
||||
: _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
Normal file
10
blk/381
Normal file
@ -0,0 +1,10 @@
|
||||
( 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
Normal file
13
blk/382
Normal file
@ -0,0 +1,13 @@
|
||||
( 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
Normal file
15
blk/383
Normal file
@ -0,0 +1,15 @@
|
||||
: _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
Normal file
7
blk/384
Normal file
@ -0,0 +1,7 @@
|
||||
: SDC@
|
||||
2 * DUP BLK( SWAP ( b a b )
|
||||
_sdc@
|
||||
1+ BLK( 512 + SWAP
|
||||
_sdc@
|
||||
;
|
||||
|
16
blk/385
Normal file
16
blk/385
Normal file
@ -0,0 +1,16 @@
|
||||
: _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
Normal file
7
blk/386
Normal file
@ -0,0 +1,7 @@
|
||||
: SDC!
|
||||
2 * DUP BLK( SWAP ( b a b )
|
||||
_sdc!
|
||||
1+ BLK( 512 + SWAP
|
||||
_sdc!
|
||||
;
|
||||
|
16
blk/390
Normal file
16
blk/390
Normal file
@ -0,0 +1,16 @@
|
||||
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
Normal file
16
blk/391
Normal file
@ -0,0 +1,16 @@
|
||||
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
Normal file
7
blk/392
Normal file
@ -0,0 +1,7 @@
|
||||
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
Normal file
15
blk/393
Normal file
@ -0,0 +1,15 @@
|
||||
: 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
Normal file
8
blk/394
Normal file
@ -0,0 +1,8 @@
|
||||
: ABORT (resSP) QUIT ;
|
||||
|
||||
: = CMP NOT ;
|
||||
: < CMP -1 = ;
|
||||
: > CMP 1 = ;
|
||||
: 0< 32767 > ;
|
||||
|
||||
|
15
blk/395
Normal file
15
blk/395
Normal file
@ -0,0 +1,15 @@
|
||||
( 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
Normal file
11
blk/396
Normal file
@ -0,0 +1,11 @@
|
||||
( 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
Normal file
16
blk/397
Normal file
@ -0,0 +1,16 @@
|
||||
: (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
Normal file
11
blk/398
Normal file
@ -0,0 +1,11 @@
|
||||
( 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
Normal file
12
blk/399
Normal file
@ -0,0 +1,12 @@
|
||||
( 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
Normal file
16
blk/400
Normal file
@ -0,0 +1,16 @@
|
||||
( 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
Normal file
10
blk/401
Normal file
@ -0,0 +1,10 @@
|
||||
: SCPY
|
||||
BEGIN ( a )
|
||||
DUP C@ ( a c )
|
||||
DUP C, ( a c )
|
||||
NOT IF DROP EXIT THEN
|
||||
1+ ( a+1 )
|
||||
AGAIN
|
||||
;
|
||||
|
||||
|
15
blk/402
Normal file
15
blk/402
Normal file
@ -0,0 +1,15 @@
|
||||
: [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
Normal file
14
blk/403
Normal file
@ -0,0 +1,14 @@
|
||||
: INTERPRET
|
||||
BEGIN
|
||||
WORD
|
||||
(find)
|
||||
IF
|
||||
1 FLAGS !
|
||||
EXECUTE
|
||||
0 FLAGS !
|
||||
ELSE
|
||||
(parse*) @ EXECUTE
|
||||
THEN
|
||||
AGAIN
|
||||
;
|
||||
|
11
blk/404
Normal file
11
blk/404
Normal file
@ -0,0 +1,11 @@
|
||||
( 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
Normal file
12
blk/405
Normal file
@ -0,0 +1,12 @@
|
||||
: 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
Normal file
14
blk/406
Normal file
@ -0,0 +1,14 @@
|
||||
( 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
Normal file
16
blk/407
Normal file
@ -0,0 +1,16 @@
|
||||
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
60
drv/acia.z80
@ -1,60 +0,0 @@
|
||||
( 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,
|
@ -1,10 +1,5 @@
|
||||
TARGETS = forth/forth
|
||||
TARGETS = forth/forth forth/stage2
|
||||
# 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
|
||||
@ -76,7 +71,7 @@ emul.o: emul.c
|
||||
|
||||
.PHONY: updatebootstrap
|
||||
updatebootstrap: forth/stage2
|
||||
cat $(BOOTSRCS) | ./forth/stage2 > ./forth/z80c.bin
|
||||
cat ./forth/xcomp.fs | ./forth/stage2 > ./forth/z80c.bin
|
||||
|
||||
.PHONY: pack
|
||||
pack:
|
||||
|
@ -1,3 +0,0 @@
|
||||
212 LOAD ( z80 assembler )
|
||||
0xe800 CONSTANT RAMSTART
|
||||
0xf000 CONSTANT RS_ADDR
|
@ -1,6 +1,10 @@
|
||||
0xe800 CONSTANT RAMSTART
|
||||
0xf000 CONSTANT RS_ADDR
|
||||
212 LOAD ( z80 assembler )
|
||||
262 LOAD ( xcomp )
|
||||
: CODE XCODE ;
|
||||
: IMMEDIATE XIMM ;
|
||||
: (entry) (xentry) ;
|
||||
: : [ ' X: , ] ;
|
||||
|
||||
CURRENT @ XCURRENT !
|
||||
@ -8,3 +12,6 @@ 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!
|
||||
|
@ -1,3 +0,0 @@
|
||||
(xentry) _
|
||||
H@ 256 /MOD 2 PC! 2 PC!
|
||||
|
252
forth/icore.fs
252
forth/icore.fs
@ -1,252 +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.
|
||||
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!
|
@ -4,12 +4,6 @@ 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 \
|
||||
@ -30,8 +24,8 @@ $(TARGET): z80c.bin $(SLATEST) $(PATHS)
|
||||
$(SLATEST) $@
|
||||
cat $(PATHS) | $(STRIPFC) >> $@
|
||||
|
||||
z80c.bin: conf.fs
|
||||
cat $(BOOTSRCS) | $(STAGE2) > $@
|
||||
z80c.bin: xcomp.fs
|
||||
cat xcomp.fs | $(STAGE2) > $@
|
||||
|
||||
$(SLATEST):
|
||||
$(MAKE) -C $(BASEDIR)/tools
|
||||
|
@ -1,10 +0,0 @@
|
||||
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
|
||||
|
25
recipes/rc2014/xcomp.fs
Normal file
25
recipes/rc2014/xcomp.fs
Normal file
@ -0,0 +1,25 @@
|
||||
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