Apple-2-SW
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prodos-drivers
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WIP: Chain using file I/O

This commit is contained in:
Joshua Bell 2019-09-28 20:54:23 -07:00
parent 291d0f12f2
commit 7af95f7162
6 changed files with 380 additions and 325 deletions
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628
cricket.system.s
View File

@ -8,8 +8,10 @@
.setcpu "6502"
.linecont +
.feature string_escapes
.include "apple2.inc"
.include "apple2.mac"
.include "opcodes.inc"
.include "inc/apple2.inc"
@ -27,15 +29,13 @@
;;; ------------------------------------------------------------
.org $1000
;; Loaded at $2000 but relocates to $1000
;; SYS files load at $2000; relocates self to $1000
.org SYS_ADDR
dst_addr := $1000
;;; ------------------------------------------------------------
sys_start:
sec
bcs relocate
jmp relocate
.byte MM, DD, YY ; version date stamp
@ -46,7 +46,7 @@ sys_start:
.proc relocate
src := SYS_ADDR
dst := $1000
dst := dst_addr
ldx #(sys_end - sys_start + $FF) / $100 ; pages
ldy #0
@ -59,57 +59,343 @@ load: lda src,y ; self-modified
inc load_hi
inc store_hi
dex
beq find_self_name ; done
jmp load
bne load
jmp main
.endproc
;;; ------------------------------------------------------------
;;; Identify the name of this SYS file, which should be present at
;;; $280 with or without a path prefix. This is used when searching
;;; for the next .SYSTEM file to execute.
;;; ============================================================
;;; Start of relocated code
.proc find_self_name
;; Search pathname buffer backwards for '/', then
;; copy name into |self_name|; this is used later
;; to find/invoke the next .SYSTEM file.
sys_start:
pushorg dst_addr
;;; ============================================================
;;; Main routine
;;; ============================================================
.proc main
jsr setup
jsr maybe_install_driver
jsr launch_next
brk
.endproc
;;; ============================================================
;;; Preserve state needed to chain to next file
;;; ============================================================
.proc setup
;; --------------------------------------------------
;; 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)
lda #0
sta $A8
ldx PATHNAME
beq pre_install
floop: inc $A8
beq no_name
ldy #0 ; Y = length
: lda PATHNAME,x
and #$7f ; ignore high bit
cmp #'/'
beq copy_name
iny
dex
beq @copy
lda PATHNAME,x
eor #'/'
asl a
bne floop
bne :-
;; Copy name into |self_name| buffer
@copy: ldy #0
cloop: iny
inx
lda PATHNAME,x
sta self_name,y
cpy $A8
bcc cloop
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
;;; ============================================================
;;; Find and invoke the next .SYSTEM file
;;; ============================================================
.proc quit
MLI_CALL QUIT, quit_params
brk ; crash if QUIT fails
DEFINE_QUIT_PARAMS quit_params
.endproc
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
;; Update reset vector - now terminates.
lda #<quit
sta $03F2
lda #>quit
sta $03F3
eor #$A5
sta $03F4
;; 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
beq 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
;; Fall through...
;;; ------------------------------------------------------------
;;; 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
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
;;; ============================================================
;;; Data
suffix:
PASCAL_STRING ".SYSTEM"
found_self_flag:
.byte 0
;;; ============================================================
;;;
;;; Driver Installer
;;;
;;; ============================================================
;;; ============================================================
;;; Before installing, get the system to a known state and
;;; ensure there is not a previous clock driver installed.
.proc pre_install
.proc maybe_install_driver
cld
bit ROMIN2
;; Update reset vector - re-invokes this code.
lda #<pre_install
lda #<maybe_install_driver
sta $03F2
lda #>pre_install
lda #>maybe_install_driver
sta $03F3
eor #$A5
sta $03F4
@ -150,8 +436,7 @@ cloop: iny
and #$01 ; existing clock card?
beq detect_cricket ; nope, check for Cricket
;; Chain with no message
jmp launch_next_sys_file
rts ; yes, done!
.endproc
;;; ------------------------------------------------------------
@ -228,8 +513,9 @@ not_found:
;; Show failure message
jsr HOME
jsr zstrout
HIASCIIZ CR, CR, CR, PRODUCT, " - Not Found."
jmp launch_next_sys_file
scrcode "\r\r\r", PRODUCT, " - Not Found."
.byte 0
rts
restore_cmd_ctl:
lda saved_control
@ -316,7 +602,8 @@ loop: lda driver,y
bit ROMIN2
jsr HOME
jsr zstrout
HIASCIIZ CR, CR, CR, PRODUCT, " - Installed "
scrcode "\r\r\r", PRODUCT, " - Installed "
.byte 0
;; Display the current date
lda DATELO+1 ; month
@ -344,141 +631,13 @@ loop: lda driver,y
pla ; year
jsr cout_number
jsr CROUT
rts ; done!
.endproc
;;; ------------------------------------------------------------
;;; Find and invoke the next .SYSTEM file
.proc launch_next_sys_file
;; Update reset vector - now terminates.
lda #<quit
sta $03F2
lda #>quit
sta $03F3
eor #$A5
sta $03F4
ptr := $A5
num := $A7
len := $A8
lda DEVNUM ; stick with most recent device
sta read_block_params_unit_num
jsr read_block
lda data_buffer + VolumeDirectoryHeader::entry_length
sta entry_length_mod
lda data_buffer + VolumeDirectoryHeader::entries_per_block
sta entries_per_block_mod
lda #1
sta num
lda #<(data_buffer + .sizeof(VolumeDirectoryHeader))
sta ptr
lda #>(data_buffer + .sizeof(VolumeDirectoryHeader))
sta ptr+1
;; Process directory entry
entry: ldy #FileEntry::file_type ; file_type
lda (ptr),y
cmp #$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 #.strlen(SYSTEM_SUFFIX)-1
: lda (ptr),y
cmp suffix,x
bne next
dey
dex
bpl :-
;; 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
lda data_buffer + VolumeDirectoryHeader::next_block
sta read_block_params_block_num
lda data_buffer + VolumeDirectoryHeader::next_block + 1
sta read_block_params_block_num+1
ora read_block_params_block_num
beq not_found ; last block has next=0
jsr read_block
lda #0
sta num
lda #<(data_buffer + $04)
sta ptr
lda #>(data_buffer + $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
;; Compose the path to invoke. First walk self path
;; backwards to '/'.
ldx PATHNAME
beq append
: dex
beq append
lda PATHNAME,x
eor #'/'
asl a
bne :-
;; Now append name of found file.
append: ldy #0
: iny
inx
lda (ptr),y
sta PATHNAME,x
cpy len
bcc :-
stx PATHNAME
jmp invoke_system_file
not_found:
jsr zstrout
HIASCIIZ CR, CR, CR, "* Unable to find next '.SYSTEM' file *", CR
bit KBDSTRB
: lda KBD
bpl :-
bit KBDSTRB
jmp quit
.endproc
;;; ============================================================
;;; Common Routines
;;; ============================================================
;;; ------------------------------------------------------------
;;; Output a high-ascii, null-terminated string.
@ -511,6 +670,9 @@ skip: inc ptr
rts
.endproc
lowercase_mask:
.byte $FF ; Set to $DF on systems w/o lower-case
;;; ------------------------------------------------------------
;;; COUT a 2-digit number in A
@ -537,118 +699,9 @@ units: pla
rts
.endproc
;;; ------------------------------------------------------------
lowercase_mask:
.byte $FF ; Set to $DF on systems w/o lower-case
;;; ------------------------------------------------------------
;;; Invoke ProDOS QUIT routine.
.proc quit
MLI_CALL QUIT, quit_params
.byte 0 ; crash if QUIT fails
rts
.proc quit_params
.byte 4 ; param_count
.byte 0 ; quit_type
.word 0000 ; reserved
.byte 0 ; reserved
.word 0000 ; reserved
.endproc
.endproc
;;; ------------------------------------------------------------
;;; Read a disk block.
.proc read_block
MLI_CALL READ_BLOCK, read_block_params
bcs on_error
rts
.endproc
.proc read_block_params
.byte 3 ; param_count
unit_num: .byte $60 ; unit_num
.addr data_buffer ; data_buffer
block_num: .word 2 ; block_num - block 2 is volume directory
.endproc
read_block_params_unit_num := read_block_params::unit_num
read_block_params_block_num := read_block_params::block_num
;;; ------------------------------------------------------------
;;; 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
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
HIASCIIZ CR, CR, CR, "** Disk Error $"
pla
jsr PRBYTE
jsr zstrout
HIASCIIZ " **", CR
bit KBDSTRB
: lda KBD
bpl :-
bit KBDSTRB
jmp quit
.endproc
;;; ------------------------------------------------------------
.proc open_params
.byte 3 ; param_count
.addr PATHNAME ; pathname
.addr data_buffer ; io_buffer
ref_num:.byte 1 ; ref_num
.endproc
open_params_ref_num := open_params::ref_num
.proc read_params
.byte 4 ; param_count
ref_num:.byte 1 ; ref_num
.addr SYS_ADDR ; data_buffer
.word MAX_DW ; request_count
.word 0 ; trans_count
.endproc
read_params_ref_num := read_params::ref_num
.proc close_params
.byte 1 ; param_count
ref_num:.byte 0 ; ref_num
.endproc
;;; ------------------------------------------------------------
found_self_flag:
.byte 0
suffix: .byte SYSTEM_SUFFIX
self_name:
PASCAL_STRING "CRICKET.SYSTEM"
;;; ------------------------------------------------------------
;;; ============================================================
;;; Cricket Clock Driver - copied into ProDOS
;;; ============================================================
.proc driver
scratch := $3A ; ZP scratch location
@ -741,4 +794,7 @@ done: pla ; restore saved command state
.assert sizeof_driver <= 125, error, "Clock code must be <= 125 bytes"
;;; ------------------------------------------------------------
;;; ============================================================
;;; End of relocated code
poporg
sys_end:

22
inc/macros.inc
View File

@ -119,27 +119,5 @@ end:
;;; ============================================================
;;; Define a string with high bits set
;;; e.g. HIASCII "Ding ding", $7, $7
.macro HIASCII arg, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9
.if .blank(arg)
.exitmacro
.endif
.if .match ({arg}, "") ; string?
.repeat .strlen(arg), i
.byte .strat(arg, i) | $80
.endrep
.else ; otherwise assume number/char/identifier
.byte (arg | $80)
.endif
HIASCII arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9
.endmacro
;;; Like HIASCII, but null-terminated
.macro HIASCIIZ arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9
HIASCII arg1, arg2, arg3, arg4, arg5, arg6, arg7, arg8, arg9
.byte 0
.endmacro
;;; Set the high bit on the passed byte
.define HI(c) ((c)|$80)

21
ns.clock.system.s
View File

@ -7,8 +7,10 @@
.setcpu "6502"
.linecont +
.feature string_escapes
.include "apple2.inc"
.include "apple2.mac"
.include "opcodes.inc"
.include "inc/apple2.inc"
@ -240,7 +242,9 @@ not_found:
;; Show failure message
jsr HOME
jsr zstrout
HIASCIIZ CR, CR, CR, PRODUCT, " - Not Found."
scrcode "\r\r\r", PRODUCT, " - Not Found."
.byte 0
jmp launch_next_sys_file
saved: .byte 0, 0, 0, 0
@ -289,7 +293,8 @@ loop: lda driver,y
bit ROMIN2
jsr HOME
jsr zstrout
HIASCIIZ CR, CR, CR, PRODUCT, " - Installed "
scrcode "\r\r\r", PRODUCT, " - Installed "
.byte 0
;; Display the current date
lda DATELO+1 ; month
@ -445,7 +450,9 @@ append: ldy #0
not_found:
jsr zstrout
HIASCIIZ CR, CR, CR, "* Unable to find next '.SYSTEM' file *", CR
scrcode "\r\r\r* Unable to find next '.SYSTEM' file *\r"
.byte 0
bit KBDSTRB
: lda KBD
bpl :-
@ -574,11 +581,15 @@ block_num: .word 2 ; block_num - block 2 is volume directory
.proc on_error
pha
jsr zstrout
HIASCIIZ CR, CR, CR, "** Disk Error $"
scrcode "\r\r\r** Disk Error $"
.byte 0
pla
jsr PRBYTE
jsr zstrout
HIASCIIZ " **", CR
scrcode " **\r"
.byte 0
bit KBDSTRB
: lda KBD
bpl :-

6
set.date.s
View File

@ -3,8 +3,10 @@
.setcpu "6502"
.linecont +
.feature string_escapes
.include "apple2.inc"
.include "apple2.mac"
.include "inc/apple2.inc"
.include "inc/macros.inc"
@ -13,9 +15,7 @@
.proc main
jsr zstrout
HIASCII CR, "Date: WWW MM/DD/YY"
HIASCII BS, BS, BS, BS, BS, BS
HIASCII BS, BS, BS, BS, BS, BS
scrcode "\rDate: WWW MM/DD/YY\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08"
.byte 0
jsr GETLN2

6
set.time.s
View File

@ -3,8 +3,10 @@
.setcpu "6502"
.linecont +
.feature string_escapes
.include "apple2.inc"
.include "apple2.mac"
.include "inc/apple2.inc"
.include "inc/macros.inc"
@ -13,9 +15,7 @@
.proc main
jsr zstrout
HIASCII CR, "Time: HH:MM:SS XM"
HIASCII BS, BS, BS, BS, BS, BS
HIASCII BS, BS, BS, BS, BS
scrcode "\rTime: HH:MM:SS XM\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08\x08"
.byte 0
jsr GETLN2

22
test.s
View File

@ -5,8 +5,10 @@
.setcpu "6502"
.linecont +
.feature string_escapes
.include "apple2.inc"
.include "apple2.mac"
.include "opcodes.inc"
.include "./inc/apple2.inc"
@ -33,12 +35,16 @@
bne ssc_not_found
jsr zstrout
HIASCIIZ "SSC found.", CR
scrcode "SSC found.\r"
.byte 0
jmp init_ssc
ssc_not_found:
jsr zstrout
HIASCIIZ "SSC not found.", CR
scrcode "SSC not found.\r"
.byte 0
rts
;; TODO: Write NUL and check for 'C' ... version ... $8D (CR)
@ -64,7 +70,8 @@ init_ssc:
;; by a version number (in ASCII) and a carriage return (141,
;; $8D)."
jsr zstrout
HIASCIIZ "Reading SSC: "
scrcode "Reading SSC: "
.byte 0
jsr readbyte
bcs cricket_not_found ; timeout
@ -89,12 +96,14 @@ digit: cmp #HI('0') ; < '0' ?
cricket_found:
jsr zstrout
HIASCIIZ CR, "Cricket tentatively found.", CR
scrcode "\rCricket tentatively found.\r"
.byte 0
jmp exit
cricket_not_found:
jsr zstrout
HIASCIIZ CR, "Cricket not identified.", CR
scrcode "\rCricket not identified.\r"
.byte 0
jmp exit
exit:
@ -143,7 +152,8 @@ check: lda STATUS ; did we get it?
bne check
jsr zstrout
HIASCIIZ "... timeout!"
scrcode "... timeout!"
.byte 0
sec ; failed
rts