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|
;*=*=*
; xtrsmous/cmd
; LS-DOS driver for xtrs emulation of mouse
;
; Copyright (c) 1998, Timothy Mann
; $Id: xtrsmous.z80,v 1.2 2008/06/26 04:39:56 mann Exp $
;
; This software may be copied, modified, and used for any
; purpose without fee, provided that (1) the above copyright
; notice is retained, and (2) modified versions are clearly
; marked as having been modified, with the modifier's name and
; the date included.
;
; Usage:
; xtrsmous To load driver in high memory.
; xtrsmous (low) To load driver in low memory if possible,
; or in high memory if low memory is full.
;
; The default is to use high memory because MDRAW/BAS contains a
; PEEK in the first line of code that looks for the driver in
; high memory; if it is in low memory, MDRAW thinks the driver
; is not installed and exits. If you edit this line of code to
; remove the test, the driver will work fine in low memory.
;*=*=*
; ASCII chars
LF equ 10
CR equ 13
ETX equ 3
; Model 4 SVC numbers
@high equ 100
@dsply equ 10
@flags equ 101
@logot equ 12
@gtdcb equ 82
@gtmod equ 83
@keyin equ 9
@param equ 17
@mouse equ 120 ;unofficial value
svcvec equ 100h + 2*@mouse
; xtrs emts (byte-reversed)
emt_mouse equ 029edh
org 3000h
;*=*=*
; Relocator for disk driver
;*=*=*
instal: ld de,prmtab
ld a,@param ;Parse parameters
rst 40
jp nz,prmerr
ld hl,hello_
ld a,@dsply ;Display hello
rst 40
;*=*=*
; Check if driver already loaded
;*=*=*
ld de,modnam
ld a,@gtmod
rst 40
jp z,loaded ;Already loaded
;*=*=*
; Check if OK to use low memory.
;*=*=*
lparm: ld bc,0
ld a,b
or c
jr z,usehi
;*=*=*
; Obtain low memory driver pointer. Bizarre API here!
;*=*=*
ld e,'K' ;Locate pointer to *KI DCB
ld d,'I' ; via @GTDCB SVC
ld a,@gtdcb
rst 40
jp nz,curdl ;No error unless KI clobbered!
dec hl ;Decrement to driver pointer
ld d,(hl) ;P/u hi-order of pointer,
dec hl ; decrement to and p/u
ld e,(hl) ; lo-order of pointer
;*=*=*
; Check if driver will fit into [(LCPTR), X'12FF']
;*=*=*
push hl ;Save address of pointer
ld hl,length ;New pointer will be
add hl,de ; pointer + LENGTH
ld d,h ;Save a copy in DE
ld e,l
ld bc,1301h ;If > 1300H, driver won't fit
sub a ;Reset carry flag
sbc hl,bc
pop hl ;Get back address of pointer
jr nc,usehi ;Go if driver won't fit
ld (hl),e ;Store new value of pointer
inc hl
ld (hl),d
dec de ;Last byte of driver goes here
ld (newend),de
jr dorelo
;*=*=*
; Put in high memory instead.
;*=*=*
usehi: ld hl,0 ;Get current HIGH$
ld b,l
ld a,@high
rst 40
jp nz,nomem
ld (newend),hl ;Last byte of driver goes here
ld de,length
sub a ;Reset carry flag
sbc hl,de ;Compute new HIGH$
ld a,@high ;Set new HIGH$ into the system
rst 40
;*=*=*
; Relocate internal references in driver.
; HL = address for last byte of driver.
;*=*=*
dorelo: call relo
;*=*=*
; Link to @ICNFG (must follow address relocation and precede movement)
;*=*=*
ld a,@flags ;Get flags pointer into IY
rst 40
ld a,(iy+28) ;Copy current @ICNFG into LINK
ld l,(iy+29)
ld h,(iy+30)
ld (link),a
ld (link+1),hl
ld hl,dvrcfg ;Get relocated init address
rx01 equ $-2
ld (iy+29),l ;Save in @ICNFG vector
ld (iy+30),h
ld (iy+28),0c3h ;Insert JP opcode
;*=*=*
; Move driver into low or high memory.
;*=*=*
move:
ld de,(newend) ;Destination address
ld hl,dvrend ;Last byte of module
ld bc,length ;Length of filter
lddr
ex de,hl
inc hl ;Bump to driver entry
;*=*=*
; Driver is loaded; finish up.
;*=*=*
call dvrini ;Hook into SVC table
ld hl,0 ;Successful completion
sub a
ret
;*=*=*
; Error vectors
;*=*=*
prmerr: ld hl,prmerr_
defb 0ddh
loaded: ld hl,loaded_
defb 0ddh
curdl: ld hl,curdl_
defb 0ddh
nomem: ld hl,nomem_
logot: ld a,@logot
rst 40
ld hl,-1 ;Unuccessful completion
ret
;*=*=*
; Relocate internal references in driver.
; HL = address for last byte of driver.
;*=*=*
relo: ld hl,(newend)
ld iy,reltab ;Point to relocation tbl
ld de,dvrend
sub a ;Clear carry flag
sbc hl,de
ld b,h ;Move to BC
ld c,l
rloop: ld l,(iy) ;Get address to change
ld h,(iy+1)
ld a,h
or l
ret z
ld e,(hl) ;P/U address
inc hl
ld d,(hl)
ex de,hl ;Offset it
add hl,bc
ex de,hl
ld (hl),d ;And put back
dec hl
ld (hl),e
inc iy
inc iy
jr rloop ;Loop till done
;*=*=*
; Messages and globals
;*=*=*
hello_: defb 'XTRSMOUS - Emulated mouse driver for xtrs - 9/28/98',CR
curdl_: defb 'LS-DOS is curdled!',CR
nomem_: defb 'High memory is not available!',CR
loaded_:defb 'Mouse driver is already loaded!',CR
prmerr_:defb 'Bad parameters!',CR
lcptr: defw 0
newend: defw 0
;*=*=*
; Parameter table
;*=*=*
prmtab: defb 'LOW '
defw lparm+1
defb 'L '
defw lparm+1
defb 0
;*=*=*
; Driver
;*=*=*
entry: jr begin ;The driver starts with the
defw dvrend ; DOS standard header
rx00 equ $-2
defb modptr-modnam ;Length of name
modnam: defb '$MOUSE' ;Name for @GTMOD requests
modptr: defw 0 ;These pointers are unused, but 1st byte MBZ
defw 0
;*=*=*
; Do the real work using an emulator trap
;*=*=*
begin: defw emt_mouse
ret
;*=*=*
; Boot-time initialization
;*=*=*
dvrcfg: ;@ICNFG chains in here
call dvrini
rx02 equ $-2
link: defb 'Tim' ;Replaced by next link in @ICNFG chain
;*=*=*
; Hook into SVC table
;*=*=*
dvrini: ld hl,entry
rx03 equ $-2
ld (svcvec),hl
ret
dvrend equ $-1
length equ $-entry
reltab: defw rx00,rx01,rx02,rx03,0
end instal
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