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|
page 255
.z80
extrn ddtz,bpent
extrn $stack
extrn charini,?const,?conin
extrn romend
global isv_sw
include config.inc
include z180reg.inc
include z180.lib
;CR equ 0dh
;----------------------------------------------------------------------
cseg
jp start
; restart vectors
rsti defl 1
rept 7
db 0, 0, 0, 0, 0
jp bpent
rsti defl rsti+1
endm
db 0, 0, 0, 0, 0
;----------------------------------------------------------------------
;org 40h
dw 0
db 0
if ROMSYS
$crom: defb c$rom ;
else
db 0 ;
endif
dmclrt: ;clear ram per dma
db dmct_e-dmclrt-2 ;
db sar0l ;first port
dw nullbyte ;src (fixed)
nullbyte:
db 000h ;src
dw romend ;dst (inc), start after "rom" code
db 00h ;dst
dw 0-romend ;count (64k)
dmct_e:
INIWAITS defl CWAITIO
if ROMSYS
INIWAITS defl INIWAITS+CWAITROM
endif
hwini0:
db 3 ;count
db rcr,CREFSH ;configure DRAM refresh
db dcntl,INIWAITS ;wait states
db cbar,SYS$CBAR
;----------------------------------------------------------------------
start:
ld (tmpstack),sp
ld sp,tmpstack
push af
in0 a,(itc) ;Illegal opcode trap?
jp m,??st01
ld a,i ;I register == 0 ?
jr z,??st02 ; yes, harware reset
??st01:
ld a,(syscbr)
out0 (cbr),a
pop af ;restore registers
ld sp,(tmpstack) ;
jp bpent ;
??st02:
di ;0058
ld a,CREFSH
out0 (rcr),a ; configure DRAM refresh
ld a,CWAITIO
out0 (dcntl),a ; wait states
ld a,M_NCD ;No Clock Divide
out0 (ccr),a
; ld a,M_X2CM ;X2 Clock Multiplier
; out0 (cmr),a
; search warm start mark
ld ix,mark_55AA ;00b8 ; top of common area
ld a,SYS$CBAR ;
out0 (cbar),a ;
ld a,071h ;00bc
ex af,af' ;00be ;for cbr = 0x70 downto 0x40
swsm_l:
ex af,af' ;00bf
dec a ;00c0
cp 03fh ;00c1
jr z,kstart ;00c3 ; break (mark not found)
out0 (cbr),a ;00c5
ex af,af' ;00c8
ld a,0aah ;00c9
cp (ix+000h) ;00cb
jr nz,swsm_l ;00ce
cp (ix+002h) ;00d0
jr nz,swsm_l ;00d3
cpl ;00d5
cp (ix+001h) ;00d6
jr nz,swsm_l ;00d9
cp (ix+003h) ;00db
jr nz,swsm_l ;00de
ld sp,$stack ;00e0 mark found, check
call checkcrc_alv ;00e3
jp z,wstart ;00e6 check ok,
;
; ram not ok, initialize -- kstart --
kstart:
ld a,088h ;00e9 0000-7fff: common 0
out0 (cbar),a ;00eb 8000-ffff: common 1
ld ix,08000h ;00f3
ld a,0 ;00f1 start at 008000 (2. phys. 32k block)
??f_0:
out0 (cbr),a ;00f9
ld (ix+0),a ;0103
cpl
ld (ix+1),a ;0103
cpl
add a,8 ;010a next 'bank'
cp 078h ;010c stop at 078000
jr nz,??f_0 ;010e
ld de,8000h ;0114 first block not tested, but mark as ok
ld a,0 ;00f1 start at 008000 (2. phys. 32k block)
??cp_0:
out0 (cbr),a ;011c
ld c,a
xor (ix+0)
ld b,a
ld a,c
cpl
xor (ix+1)
or b
jr nz,??cp_1
scf
??cp_1:
rr d
rr e
ld a,c
add a,8
cp 078h ; stop at 078000
jr nz,??cp_0
;
; ram test found 1 or more error free blocks (32k)
;
ramok:
ld a,SYS$CBAR ;01c8
out0 (cbar),a ;01ca
ld h,d
ld l,e
ld c,070h ;01ce highest block
ld b,15 ;01d0
??sr_1:
add hl,hl
jr c,alloc ;01d4 highest "error free" block
ld a,c ;01d6
sub 008h ;01d7
ld c,a ;01d9
djnz ??sr_1 ;01da
slp ;01dc should never be reached
alloc:
out0 (cbr),c ;01de
ld a,c
ld (syscbr),a
ld sp,$stack ;01e1
; Clear RAM using DMA0
ld hl,dmclrt ;load DMA registers
call io.ini.m
ld a,0cbh ;01ef dst +1, src fixed, burst
out0 (dmode),a ;01f1
ld b,512/64
ld a,062h ;01f4 enable dma0,
??cl_1:
out0 (dstat),a ;01f9 clear (up to) 64k
djnz ??cl_1 ; end of RAM?
; Init bank manager
ld hl,banktabsys ;020f
ld (hl),c ; Common area
inc hl ;0213
ld (hl),c ; System work area
inc hl ;0215 Point to bank 0 entry
ld b,BANKS ;0216
l0218h:
ld (hl),0ffh ;0218 Mark all banks as unassigned
inc hl ;021a
djnz l0218h ;021b
ld hl,memalv ;
ld b,8 ; 8*4k ie. first 32k
??a_0:
ld (hl),0e0h ; mark as sys ("rom"/monitor)
inc hl
djnz ??a_0
rr d ; shift out bit for block 0
rr e ;
ld c,15 ;022c 15*32k remaining blocks
l022eh:
ld a,0feh ; 0xfe == block with error(s)
rr d ;
rr e
adc a,0 ; ==> 0xff : block ok
ld b,32/4 ; 32k == 8 * 4k
l0236h:
ld (hl),a ;
inc hl ;
djnz l0236h ;
dec c ;
jr nz,l022eh ;next 32k block
ld hl,memalv+0ch ;memalv+0ch
ld a,(banktabsys) ;
call add_hl_a
ld b,3 ;
l024ah:
ld (hl),0ech ;alloc system ram
inc hl ;
djnz l024ah ;
ld (hl),0efh ;alloc common
call gencrc_alv
ld hl,0000h ;bank #
ld bc,0f0fh ; size (?) (4k blocks)
xor a ;
call sub_0420h ;alloc mem for bank 0
ld c,l ;
or a ;
call z,sub_04b5h ;
ld hl,0101h ;
ld bc,0f0fh ;
xor a ;
call sub_0420h ;
ld c,l ;
or a ;
call z,sub_04b5h ;
ld hl,055AAh ;set warm start mark
ld (mark_55AA),hl ;
ld (mark_55AA+2),hl;
;
; crc ok -- wstart --
;
wstart:
call sysram_init ;027f
call ivtab_init
call prt0_init
call charini
call bufferinit
im 2 ;?030e
ei ;0282
call ?const ;0284
call ?const ;0287
or a ;028a
call nz,?conin ;028d
ld a,(banktab) ;
ld e,a ;
jp ddtz ;0290
ds 8
tmpstack:
dw 2
syscbr: db 1
;
;----------------------------------------------------------------------
;
;TODO: Make a ringbuffer module.
global buf.init
buf.init:
ld (ix+o.in_idx),0
ld (ix+o.out_idx),0
ld (ix+o.mask),a
ret
;----------------------------------------------------------------------
if 0
extrn msginit,msg_tx_fifo,msg_rx_fifo
extrn msg.sout
bufferinit:
ld de,msg_tx_fifo
in0 a,cbr
call log2phys
ld (40h+0),hl
ld (40h+2),a
; ld (bufdat+1),hl
; ld (bufdat+3),a
; ld a,1
; ld (bufdat+0),a
; ld hl,inimsg
; call msg.sout
ld de,msg_rx_fifo
in0 a,cbr
call log2phys
ld (bufdat+1),hl
ld (bufdat+3),a
ld a,2
ld (bufdat+0),a
ld hl,inimsg
call msg.sout
ret
inimsg:
db inimsg_e - $ - 1
db 81h
db inimsg_e - $ - 1
db 0
bufdat:
db 0
dw 0
db 0
inimsg_e:
endif
;----------------------------------------------------------------------
;
extrn msginit,msg.sout
extrn mtx.fifo,mrx.fifo
extrn co.fifo,ci.fifo
bufferinit:
call msginit
ld hl,buffers
ld b,buftablen
bfi_1:
ld a,(hl)
inc hl
ld (bufdat+0),a
ld e,(hl)
inc hl
ld d,(hl)
inc hl
push hl
or a
jr nz,bfi_2
in0 a,cbr
call log2phys
ld (40h+0),hl
ld (40h+2),a
out0 (AVRINT5),a
jr bfi_3
bfi_2:
in0 a,cbr
call log2phys
ld (bufdat+1),hl
ld (bufdat+3),a
ld hl,inimsg
call msg.sout
bfi_3:
pop hl
djnz bfi_1
ret
buffers:
db 0
dw mtx.fifo
db 1
dw mrx.fifo
db 2
dw co.fifo
db 3
dw ci.fifo
buftablen equ ($ - buffers)/3
inimsg:
db inimsg_e - $ -1
db 81h
db inimsg_e - $ -1
db 0
bufdat:
db 0
dw 0
db 0
inimsg_e:
;
;----------------------------------------------------------------------
;
sysram_init:
ld hl,sysramw
ld de,topcodsys
ld bc,sysrame-sysramw
ldir
ret
;----------------------------------------------------------------------
ivtab_init:
ld hl,ivtab ;
ld a,h ;
ld i,a ;
out0 (il),l ;
; Let all vectors point to spurious int routines.
ld d,high sp.int0
ld a,low sp.int0
ld b,9
ivt_i1:
ld (hl),a
inc l
ld (hl),d
inc l
add a,sp.int.len
djnz ivt_i1
ret
;----------------------------------------------------------------------
prt0_init:
ld a,i
ld h,a
in0 a,(il)
and 0E0h
or IV$PRT0
ld l,a
ld (hl),low iprt0
inc hl
ld (hl),high iprt0
ld hl,prt0itab
call io.ini.m
ret
prt0itab:
db prt0it_e-prt0itab-2
db tmdr0l
dw PRT_TC10MS
dw PRT_TC10MS
db M_TIE0+M_TDE0 ;enable timer 0 interrupt and down count.
prt0it_e:
;
;----------------------------------------------------------------------
;
io.ini:
push bc
ld b,0 ;high byte port adress
ld a,(hl) ;count
inc hl
ioi_1:
ld c,(hl) ;port address
inc hl
outi
inc b ;outi decrements b
dec a
jr nz,ioi_1
pop bc
ret
io.ini.m:
push bc
ld b,(hl)
inc hl
ld c,(hl)
inc hl
otimr
pop bc
ret
io.ini.l:
;
;----------------------------------------------------------------------
;
; compute crc
; hl: start adr
; bc: len
; bc returns crc val
do_crc16:
ld de,0FFFFh
crc1:
ld a,(hl)
xor e
ld e,a
rrca
rrca
rrca
rrca
and 0Fh
xor e
ld e,a
rrca
rrca
rrca
push af
and 1Fh
xor d
ld d,a
pop af
push af
rrca
and 0F0h
xor d
ld d,a
pop af
and 0E0h
xor e
ld e,d
ld d,a
cpi
jp pe,crc1
or e ;z-flag
ret
gencrc_alv:
push hl ;03f6
push de ;03f7
push bc
push af ;03f8
ld hl,banktabsys ;03f9
ld bc,crc_len ;03fc
call do_crc16 ;03ff
ld (hl),e
inc hl
ld (hl),d
pop af ;0406
pop bc
pop de ;0407
pop hl ;0408
ret ;0409
checkcrc_alv:
push hl ;040a
push de
push bc ;040b
ld hl,banktabsys ;040d
ld bc,crc_len+2 ;0410
call do_crc16 ;0413
pop bc ;041d
pop de
pop hl ;041e
ret ;041f
;----------------------------------------------------------------------
;
; alloc
;
; h: max bank #
; l: min bank #
; b: max size
; c: min size
;
; ret:
; a: 0 == ok
; 1 ==
; 2 == no bank # in requested range
; ff == crc error
;
sub_0420h:
call checkcrc_alv ;0420
jr nz,l049ch ;0424 crc error, tables corrupt
call sub_049dh ;0427 bank # in req. range available?
jr c,l0499h ;042a
push ix ;042c
push iy ;042e
push de ;0430
push hl ;0431
push bc ;0432
ld c,b ;0433
ld b,alv_len+1 ;0434
ld d,0 ;0436
ld hl,memalv-1 ;0438
jr l0441h ;043b
; find free blocks
l043dh:
ld a,(hl) ;043d
inc a ;043e free blocks are marked 0ffh
jr z,l0446h ;043f
l0441h:
inc hl ;0441
djnz l043dh ;0442
jr l0464h ;0444
l0446h:
push hl ;0446
pop ix ;0447 free blocks start here
ld e,000h ;0449
jr l0451h ;044b
l044dh: ; count free blocks
ld a,(hl) ;044d
inc a ;044e
jr nz,l0457h ;044f
l0451h:
inc e ;0451
inc hl ;0452
djnz l044dh ;0453
jr l0464h ;0455
; end of free blocks run.
l0457h:
ld a,d ;0457
cp e ;0458 nr of blocks >= requested ?
jr nc,l0441h ;0459
ld d,e ;045b
push ix ;045c
pop iy ;045e
ld a,d ;0460
cp c ;0461
jr c,l0441h ;0462
l0464h:
pop bc ;0464
ld a,d ;0465
cp b ;0466
jr c,l046ch ;0467
ld d,b ;0469
jr l0471h ;046a
l046ch:
cp c ;046c
jr nc,l0471h ;046d
ld d,000h ;046f
l0471h:
ld a,d ;0471
push iy ;0472
pop hl ;0474
ld de,memalv ;0475
or a ;0478
sbc hl,de ;0479
ld b,l ;047b
ld c,a ;047c
pop hl ;047d
l047eh:
or a ;047e
jr z,l0489h ;047f
ld (iy+0),l ;0481
inc iy ;0484
dec a ;0486
jr l047eh ;0487
l0489h:
pop de ;0489
pop iy ;048a
pop ix ;048c
call gencrc_alv ;048e
ld a,c ;0491
or a ;0492
ld a,000h ;0493
ret nz ;0495
or 001h ;0496
ret ;0498
l0499h:
ld a,2 ;0499
l049ch:
or a
ret ;049c
; search a free bank number in range
; h: max #
; l: min #
; ret:
; l: bank number available
; nc, if found, bank nr. in l
; cy, if none found
sub_049dh:
push de ;049d
push bc ;049e
ex de,hl ;049f
dec e ;04a0
l04a1h:
inc e ;04a1 test next #
ld a,d ;04a2
cp e ;04a3
jr c,l04b1h ;04a4
ld a,e ;04a6
ld hl,memalv ;04a7
ld bc,alv_len ;04aa
cpir ;04ad bank# allready allocated?
jr z,l04a1h ;04af if yes, search for next
l04b1h:
ex de,hl ;04b1
pop bc ;04b2
pop de ;04b3
ret ;04b4
sub_04b5h:
ld a,l ;04b5
cp 012h ;04b6
ccf ;04b8
ret c ;04b9
push hl ;04ba
ld hl,banktab ;04bb
call add_hl_a
ld (hl),b ;04c3
call gencrc_alv ;04c4
pop hl ;04c7
or a ;04c8 clear carry
ret ;04c9
;--------------------------------------------------------------
;
; de: Log. Address
; a: Bank number
;
;out ahl: Phys. (linear) Address
bnk2phys:
push hl
ld hl,banktab
call add_hl_a
ld a,(hl)
pop hl
; fall thru
;--------------------------------------------------------------
;
; de: Log. Address
; a: Bank (bbr)
;
; OP: ahl = (a<<12) + (d<<8) + e
;
;out ahl: Phys. (linear) Address
log2phys:
push bc ;
ld c,a ;
ld b,16 ;
mlt bc ;bc = a<<4
ld l,d ;
ld h,0 ;
add hl,bc ;bc + d == a<<4 + d
ld a,h ;
ld h,l ;
ld l,e ;
pop bc ;
ret ;
;--------------------------------------------------------------
;
;return:
; hl = hl + a
; Flags undefined
;
add_hl_a:
add a,l
ld l,a
ret nc
inc h
ret
; ---------------------------------------------------------
sysramw:
.phase isvsw_loc
topcodsys:
; Trampoline for interrupt routines in banked ram.
; Switch stack pointer to "system" stack in top ram
; Save cbar
isv_sw: ;
ex (sp),hl ; save hl, return adr in hl
push de ;
push af ;
ex de,hl ;
ld hl,0 ;
add hl,sp ;
ld a,h ;
cp 0f8h ;
jr nc,isw_1 ;
ld sp,$stack ;
isw_1:
push hl ;
in0 h,(cbar) ;
push hl ;
ld a,SYS$CBAR ;
out0 (cbar),a ;
ex de,hl ;
ld e,(hl) ;
inc hl ;
ld d,(hl) ;
ex de,hl ;
push bc ;
call jphl ;
pop bc ;
pop hl ;
out0 (cbar),h ;
pop hl ;
ld sp,hl ;
pop af ;
pop de ;
pop hl ;
ei ;
ret ;
jphl:
jp (hl) ;
; ---------------------------------------------------------
iprt0:
push af
push hl
in0 a,(tcr)
in0 a,(tmdr0l)
in0 a,(tmdr0h)
ld a,(tim_ms)
inc a
cp 100
jr nz,iprt_1
xor a
ld hl,(tim_s)
inc hl
ld (tim_s),hl
iprt_1:
ld (tim_ms),a
pop hl
pop af
ei
ret
; ---------------------------------------------------------
sp.int0:
ld a,0d0h
jr sp.i.1
sp.int.len equ $-sp.int0
ld a,0d1h
jr sp.i.1
ld a,0d2h
jr sp.i.1
ld a,0d3h
jr sp.i.1
ld a,0d4h
jr sp.i.1
ld a,0d5h
jr sp.i.1
ld a,0d6h
jr sp.i.1
ld a,0d7h
jr sp.i.1
ld a,0d8h
sp.i.1:
; out (80h),a
halt
curph defl $
.dephase
sysrame:
.phase curph
tim_ms: db 0
tim_s: dw 0
.dephase
;-----------------------------------------------------
dseg
ds 1
banktabsys:
ds 1 ;0c001h
ds 1 ;0c002h
banktab:
ds BANKS ;0c003h
memalv:
ds 512/4 ;Number of 4k blocks
alv_len equ $-memalv
crc_len equ $-banktabsys
crc_memalv:
ds 2 ;
cseg
;.phase 0ffc0h
;ivtab equ 0ffc0h ; 0ffc0h ;int vector table
;.dephase
;.phase 0fffch
mark_55AA equ 0fffch
;ds 4 ; 0fffch
;.dephase
end
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