mirror of
https://github.com/a2stuff/prodos-drivers.git
synced 2024-12-22 05:29:54 +00:00
459 lines
12 KiB
PHP
459 lines
12 KiB
PHP
;;; ------------------------------------------------------------
|
|
|
|
;; SYS files load at $2000; relocates self to $1000
|
|
.org SYS_ADDR
|
|
dst_addr := $1000
|
|
|
|
;;; ------------------------------------------------------------
|
|
|
|
jmp relocate
|
|
|
|
.byte MM, DD, YY ; version date stamp
|
|
|
|
;;; ------------------------------------------------------------
|
|
;;; Relocate this code from $2000 (.SYSTEM start location) to $1000
|
|
;;; and start executing there. This is done so that the next .SYSTEM
|
|
;;; file can be loaded/run at $2000.
|
|
|
|
.proc relocate
|
|
src := reloc_start
|
|
dst := dst_addr
|
|
|
|
ldx #(reloc_end - reloc_start + $FF) / $100 ; pages
|
|
ldy #0
|
|
load: lda src,y ; self-modified
|
|
load_hi := *-1
|
|
sta dst,y ; self-modified
|
|
store_hi := *-1
|
|
iny
|
|
bne load
|
|
inc load_hi
|
|
inc store_hi
|
|
dex
|
|
bne load
|
|
|
|
jmp main
|
|
.endproc
|
|
|
|
;;; ============================================================
|
|
;;; Start of relocated code
|
|
|
|
reloc_start := *
|
|
pushorg dst_addr
|
|
|
|
;;; ============================================================
|
|
;;; Main routine
|
|
;;; ============================================================
|
|
|
|
.proc main
|
|
jsr save_chain_info
|
|
jsr init_system
|
|
jsr maybe_install_driver
|
|
jmp launch_next
|
|
.endproc
|
|
|
|
;;; ============================================================
|
|
;;; Preserve state needed to chain to next file
|
|
;;; ============================================================
|
|
|
|
.proc save_chain_info
|
|
;; --------------------------------------------------
|
|
;; Save most recent device for later, when chaining
|
|
;; to next .SYSTEM file.
|
|
lda DEVNUM
|
|
sta devnum
|
|
|
|
;; --------------------------------------------------
|
|
;; Identify the name of this SYS file, which should be present at
|
|
;; $280 with or without a path prefix. Search pathname buffer
|
|
;; backwards for '/', then copy name into |self_name|.
|
|
|
|
;; Find '/' (which may not be present, prefix is optional)
|
|
ldx PATHNAME
|
|
beq no_name
|
|
ldy #0 ; Y = length
|
|
: lda PATHNAME,x
|
|
and #$7f ; ignore high bit
|
|
cmp #'/'
|
|
beq copy_name
|
|
iny
|
|
dex
|
|
bne :-
|
|
|
|
;; Copy name into |self_name| buffer
|
|
copy_name:
|
|
cpy #0
|
|
beq no_name
|
|
sty self_name
|
|
|
|
ldx PATHNAME
|
|
: lda PATHNAME,x
|
|
sta self_name,y
|
|
dex
|
|
dey
|
|
bne :-
|
|
|
|
;; Done
|
|
rts
|
|
|
|
no_name:
|
|
lda #0
|
|
sta self_name
|
|
rts
|
|
.endproc
|
|
|
|
devnum: .byte 0
|
|
self_name: .res 16
|
|
|
|
;;; ============================================================
|
|
;;; Init system state
|
|
;;; ============================================================
|
|
|
|
;;; Before installing, get the system to a known state.
|
|
|
|
.proc init_system
|
|
cld
|
|
bit ROMIN2
|
|
|
|
;; Update reset vector - ProDOS QUIT
|
|
lda #<quit
|
|
sta $03F2
|
|
lda #>quit
|
|
sta $03F3
|
|
eor #$A5
|
|
sta $03F4
|
|
|
|
;; Quit 80-column firmware
|
|
lda #$95 ; Ctrl+U (quit 80 col firmware)
|
|
jsr COUT
|
|
|
|
;; Reset I/O
|
|
sta CLR80VID
|
|
sta CLRALTCHAR
|
|
jsr SETVID
|
|
jsr SETKBD
|
|
jsr SETNORM
|
|
jsr INIT
|
|
jsr HOME
|
|
|
|
;; Update System Bit Map
|
|
ldx #BITMAP_SIZE-1
|
|
lda #%00000001 ; protect page $BF
|
|
: sta BITMAP,x
|
|
lda #%00000000 ; nothing else protected until...
|
|
dex
|
|
bne :-
|
|
lda #%11001111 ; ZP ($00), stack ($01), text page 1 ($04-$07)
|
|
sta BITMAP
|
|
|
|
;; Determine lowercase support
|
|
lda MACHID
|
|
and #$88 ; IIe or IIc (or IIgs) ?
|
|
bne :+
|
|
lda #$DF
|
|
sta lowercase_mask ; lower case to upper case
|
|
|
|
: rts
|
|
.endproc
|
|
|
|
;;; ============================================================
|
|
;;; Find and invoke the next .SYSTEM file
|
|
;;; ============================================================
|
|
|
|
online_buf := $1C00
|
|
io_buf := $1C00
|
|
dir_buf := $2000
|
|
block_len = $200
|
|
|
|
DEFINE_ON_LINE_PARAMS on_line_params,,online_buf
|
|
DEFINE_OPEN_PARAMS open_params, PATHNAME, io_buf
|
|
DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
|
|
DEFINE_READ_PARAMS read_block_params, dir_buf, block_len
|
|
DEFINE_CLOSE_PARAMS close_params
|
|
|
|
|
|
.proc launch_next
|
|
;; Read directory and look for .SYSTEM files; find this
|
|
;; one, and invoke the following one.
|
|
|
|
ptr := $A5
|
|
num := $A7
|
|
len := $A8
|
|
|
|
;; --------------------------------------------------
|
|
;; Own name found? If not, just quit
|
|
lda self_name
|
|
bne :+
|
|
jmp quit
|
|
|
|
;; --------------------------------------------------
|
|
;; Find name of boot device, copy into PATHNAME
|
|
: lda devnum
|
|
sta on_line_params::unit_num
|
|
MLI_CALL ON_LINE, on_line_params
|
|
bcc :+
|
|
jmp on_error
|
|
|
|
: lda #'/' ; Prefix by '/'
|
|
sta PATHNAME+1
|
|
lda online_buf
|
|
and #$0F ; Mask off length
|
|
sta PATHNAME
|
|
ldx #0 ; Copy name
|
|
: lda online_buf+1,x
|
|
sta PATHNAME+2,x
|
|
inx
|
|
cpx PATHNAME
|
|
bne :-
|
|
inx ; One more for '/' prefix
|
|
stx PATHNAME
|
|
|
|
;; Open directory
|
|
MLI_CALL OPEN, open_params
|
|
bcc :+
|
|
jmp on_error
|
|
: lda open_params::ref_num
|
|
sta read_block_params::ref_num
|
|
sta close_params::ref_num
|
|
|
|
;; Read first "block"
|
|
MLI_CALL READ, read_block_params
|
|
bcc :+
|
|
jmp on_error
|
|
|
|
;; Get sizes out of header
|
|
: lda dir_buf + VolumeDirectoryHeader::entry_length
|
|
sta entry_length_mod
|
|
lda dir_buf + VolumeDirectoryHeader::entries_per_block
|
|
sta entries_per_block_mod
|
|
lda #1
|
|
sta num
|
|
|
|
;; Set up pointers to entry
|
|
lda #<(dir_buf + .sizeof(VolumeDirectoryHeader))
|
|
sta ptr
|
|
lda #>(dir_buf + .sizeof(VolumeDirectoryHeader))
|
|
sta ptr+1
|
|
|
|
;; Process directory entry
|
|
entry: ldy #FileEntry::file_type ; file_type
|
|
lda (ptr),y
|
|
cmp #$FF ; type=SYS
|
|
bne next
|
|
ldy #FileEntry::storage_type_name_length
|
|
lda (ptr),y
|
|
and #$30 ; regular file (not directory, pascal)
|
|
beq next
|
|
lda (ptr),y
|
|
and #$0F ; name_length
|
|
sta len
|
|
tay
|
|
|
|
;; Compare suffix - is it .SYSTEM?
|
|
ldx suffix
|
|
: lda (ptr),y
|
|
cmp suffix,x
|
|
bne next
|
|
dey
|
|
dex
|
|
bne :-
|
|
|
|
;; Yes; is it *this* .SYSTEM file?
|
|
ldy self_name
|
|
cpy len
|
|
bne handle_sys_file
|
|
: lda (ptr),y
|
|
cmp self_name,y
|
|
bne handle_sys_file
|
|
dey
|
|
bne :-
|
|
sec
|
|
ror found_self_flag
|
|
|
|
;; Move to the next entry
|
|
next: lda ptr
|
|
clc
|
|
adc #$27 ; self-modified: entry_length
|
|
entry_length_mod := *-1
|
|
sta ptr
|
|
bcc :+
|
|
inc ptr+1
|
|
: inc num
|
|
lda num
|
|
cmp #$0D ; self-modified: entries_per_block
|
|
entries_per_block_mod := *-1
|
|
bcc entry
|
|
|
|
;; Read next "block"
|
|
MLI_CALL READ, read_block_params
|
|
bcs not_found
|
|
|
|
;; Set up pointers to entry
|
|
lda #0
|
|
sta num
|
|
lda #<(dir_buf + $04)
|
|
sta ptr
|
|
lda #>(dir_buf + $04)
|
|
sta ptr+1
|
|
jmp entry
|
|
|
|
;; --------------------------------------------------
|
|
;; Found a .SYSTEM file which is not this one; invoke
|
|
;; it if follows this one.
|
|
handle_sys_file:
|
|
bit found_self_flag
|
|
bpl next
|
|
|
|
MLI_CALL CLOSE, close_params
|
|
|
|
;; Compose the path to invoke.
|
|
ldx PATHNAME
|
|
inx
|
|
lda #'/'
|
|
sta PATHNAME,x
|
|
ldy #0
|
|
: iny
|
|
inx
|
|
lda (ptr),y
|
|
sta PATHNAME,x
|
|
cpy len
|
|
bcc :-
|
|
stx PATHNAME
|
|
|
|
jmp invoke_system_file
|
|
|
|
not_found:
|
|
jsr zstrout
|
|
scrcode "\r\r* Unable to find next '.SYSTEM' file *\r"
|
|
.byte 0
|
|
|
|
bit KBDSTRB
|
|
: lda KBD
|
|
bpl :-
|
|
bit KBDSTRB
|
|
jmp quit
|
|
.endproc
|
|
|
|
;;; ------------------------------------------------------------
|
|
;;; Load/execute the system file in PATHNAME
|
|
|
|
.proc invoke_system_file
|
|
MLI_CALL OPEN, open_params
|
|
bcs on_error
|
|
|
|
lda open_params::ref_num
|
|
sta read_params::ref_num
|
|
sta close_params::ref_num
|
|
|
|
MLI_CALL READ, read_params
|
|
bcs on_error
|
|
|
|
MLI_CALL CLOSE, close_params
|
|
bcs on_error
|
|
|
|
jmp SYS_ADDR ; Invoke loaded SYSTEM file
|
|
.endproc
|
|
|
|
;;; ------------------------------------------------------------
|
|
;;; Error handler - invoked if any ProDOS error occurs.
|
|
|
|
.proc on_error
|
|
pha
|
|
jsr zstrout
|
|
scrcode "\r\r* Disk Error $"
|
|
.byte 0
|
|
|
|
pla
|
|
jsr PRBYTE
|
|
|
|
jsr zstrout
|
|
scrcode " *\r"
|
|
.byte 0
|
|
|
|
bit KBDSTRB
|
|
: lda KBD
|
|
bpl :-
|
|
bit KBDSTRB
|
|
jmp quit
|
|
.endproc
|
|
|
|
.proc quit
|
|
MLI_CALL QUIT, quit_params
|
|
brk ; crash if QUIT fails
|
|
|
|
DEFINE_QUIT_PARAMS quit_params
|
|
.endproc
|
|
|
|
;;; ============================================================
|
|
;;; Data
|
|
|
|
suffix:
|
|
PASCAL_STRING ".SYSTEM"
|
|
|
|
found_self_flag:
|
|
.byte 0
|
|
|
|
;;; ============================================================
|
|
;;; Common Routines
|
|
;;; ============================================================
|
|
|
|
;;; ------------------------------------------------------------
|
|
;;; Output a high-ascii, null-terminated string.
|
|
;;; String immediately follows the JSR.
|
|
|
|
.proc zstrout
|
|
ptr := $A5
|
|
|
|
pla ; read address from stack
|
|
sta ptr
|
|
pla
|
|
sta ptr+1
|
|
bne skip ; always (since data not on ZP)
|
|
|
|
next: cmp #HI('a') ; lower-case?
|
|
bcc :+
|
|
and lowercase_mask ; make upper-case if needed
|
|
: jsr COUT
|
|
skip: inc ptr
|
|
bne :+
|
|
inc ptr+1
|
|
: ldy #0
|
|
lda (ptr),y
|
|
bne next
|
|
|
|
lda ptr+1 ; restore address to stack
|
|
pha
|
|
lda ptr
|
|
pha
|
|
rts
|
|
.endproc
|
|
|
|
lowercase_mask:
|
|
.byte $FF ; Set to $DF on systems w/o lower-case
|
|
|
|
;;; ------------------------------------------------------------
|
|
;;; COUT a 2-digit number in A
|
|
|
|
.proc cout_number
|
|
ldx #HI('0')
|
|
cmp #10 ; >= 10?
|
|
bcc tens
|
|
|
|
;; divide by 10, dividend(+'0') in x remainder in a
|
|
: sbc #10
|
|
inx
|
|
cmp #10
|
|
bcs :-
|
|
|
|
tens: pha
|
|
cpx #HI('0')
|
|
beq units
|
|
txa
|
|
jsr COUT
|
|
|
|
units: pla
|
|
ora #HI('0')
|
|
jsr COUT
|
|
rts
|
|
.endproc
|