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Rearrange so driver is a subroutine

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This commit is contained in:
Joshua Bell 2019-06-19 20:12:18 -07:00
parent 903cd4ff1e
commit 88472a8e11
1 changed files with 296 additions and 289 deletions
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585
ram.drv.system.s
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@ -43,13 +43,14 @@ SYS_LEN = $BF00 - SYS_ADDR ; Maximum SYS file length
dst_addr := $1000 dst_addr := $1000
;;; ============================================================ ;;; ============================================================
;;; Relocate from $2000 to $1000
.proc relocate .proc relocate
src := SYS_ADDR src := SYS_ADDR
ldx #(sys_end - sys_start + $FF) / $100 ; pages ldx #(sys_end - sys_start + $FF) / $100 ; pages
ldy #0 ldy #0
load: lda sys_start,y ; self-modified load: lda sys_start,y ; self-modified
load_hi := *-1 load_hi := *-1
sta dst_addr,y ; self-modified sta dst_addr,y ; self-modified
store_hi := *-1 store_hi := *-1
@ -60,21 +61,304 @@ load: lda sys_start,y ; self-modified
dex dex
bne load bne load
jmp dst_addr jmp main
.endproc
;;; ============================================================
;;; Start of relocated code
;;;
sys_start:
pushorg dst_addr
;;; ============================================================
;;; Main routine
;;; ============================================================
.proc main
jsr setup
jsr install_driver
jsr launch_next
brk
.endproc .endproc
;;; ============================================================ ;;; ============================================================
;;; Start of relocated code ;;; Preserve state needed to chain to next file
sys_start: ;;; ============================================================
pushorg dst_addr
.proc setup
;; Save most recent device for later, when chaining ;; Save most recent device for later, when chaining
;; to next .SYSTEM file. ;; to next .SYSTEM file.
lda DEVNUM lda DEVNUM
sta read_block_params_unit_num sta read_block_params_unit_num
rts
.endproc
jmp install_driver
;;; ============================================================
;;; Find and invoke the next .SYSTEM file
;;; ============================================================
.proc launch_next
ptr := $A5
num := $A7
len := $A8
;; --------------------------------------------------
;; Update reset vector - now terminates.
lda #<quit
sta $03F2
lda #>quit
sta $03F3
eor #$A5
sta $03F4
;; --------------------------------------------------
;; Identify the name of this SYS file, which should be present at
;; $280 with or without a path prefix. Search pathname buffer
;; backwards for '/', then copy name into |self_name|.
;; Find '/' (which may not be present, prefix is optional)
lda #0
sta len
ldx PATHNAME
beq read_dir
floop: inc len
dex
beq copy_name
lda PATHNAME,x
eor #'/'
asl a
bne floop
;; Copy name into |self_name| buffer
copy_name:
ldy #0
cloop: iny
inx
lda PATHNAME,x
sta self_name,y
cpy len
bcc cloop
sty self_name
;; --------------------------------------------------
;; Read directory and look for .SYSTEM files; find this
;; one, and invoke the following one.
read_dir:
jsr read_block
lda data_buf + VolumeDirectoryHeader::entry_length
sta entry_length_mod
lda data_buf + VolumeDirectoryHeader::entries_per_block
sta entries_per_block_mod
lda #1
sta num
lda #<(data_buf + .sizeof(VolumeDirectoryHeader))
sta ptr
lda #>(data_buf + .sizeof(VolumeDirectoryHeader))
sta ptr+1
;; Process directory entry
entry: ldy #FileEntry::file_type ; file_type
lda (ptr),y
cmp #$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
lda data_buf + VolumeDirectoryHeader::next_block
sta read_block_params_block_num
lda data_buf + 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_buf + $04)
sta ptr
lda #>(data_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
;; 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
scrcode "\r\r* Unable to find next '.SYSTEM' file *\r"
.byte 0
bit KBDSTRB
: lda KBD
bpl :-
bit KBDSTRB
jmp quit
.endproc
;;; ------------------------------------------------------------
;;; Invoke ProDOS QUIT routine.
.proc quit
MLI_CALL QUIT, quit_params
.byte 0 ; crash if QUIT fails
rts
DEFINE_QUIT_PARAMS quit_params
.endproc
;;; ------------------------------------------------------------
;;; Read a disk block.
.proc read_block
MLI_CALL READ_BLOCK, read_block_params
bcs on_error
rts
.endproc
;; block 2 is volume directory
DEFINE_READ_BLOCK_PARAMS read_block_params, data_buf, 2
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
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
;;; ------------------------------------------------------------
DEFINE_OPEN_PARAMS open_params, PATHNAME, data_buf
open_params_ref_num := open_params::ref_num
DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
read_params_ref_num := read_params::ref_num
DEFINE_CLOSE_PARAMS close_params
;;; ============================================================
;;; Data
suffix:
PASCAL_STRING ".SYSTEM"
found_self_flag:
.byte 0
;;; ============================================================
;;;
;;; Driver
;;;
;;; ============================================================
;;; ============================================================ ;;; ============================================================
;;; Configuration Parameters ;;; Configuration Parameters
@ -449,7 +733,7 @@ install_success:
scrcode "\r\r\r", PRODUCT, " - Installed" scrcode "\r\r\r", PRODUCT, " - Installed"
.byte 0 .byte 0
jmp launch_next_sys_file rts
install_failure: install_failure:
sta ALTZPOFF sta ALTZPOFF
@ -459,7 +743,7 @@ install_failure:
scrcode "\r\r\r", PRODUCT, " - Not Installed" scrcode "\r\r\r", PRODUCT, " - Not Installed"
.byte 0 .byte 0
jmp launch_next_sys_file rts
;;; ============================================================ ;;; ============================================================
;;; Installed on zero page of each bank at $B0 ;;; Installed on zero page of each bank at $B0
@ -722,173 +1006,10 @@ bank_list:
driver_block_x := driver_src + driver_src::driver_block_x - driver_src::driver_start driver_block_x := driver_src + driver_src::driver_block_x - driver_src::driver_start
driver_bank_list := driver_src + driver_src::bank_list - driver_src::driver_start driver_bank_list := driver_src + driver_src::bank_list - driver_src::driver_start
;;; ============================================================
;;; Common Routines
;;; ============================================================ ;;; ============================================================
;;; Find and invoke the next .SYSTEM file
.proc launch_next_sys_file
ptr := $A5
num := $A7
len := $A8
;; --------------------------------------------------
;; Update reset vector - now terminates.
lda #<quit
sta $03F2
lda #>quit
sta $03F3
eor #$A5
sta $03F4
;; --------------------------------------------------
;; Identify the name of this SYS file, which should be present at
;; $280 with or without a path prefix. Search pathname buffer
;; backwards for '/', then copy name into |self_name|.
;; Find '/' (which may not be present, prefix is optional)
lda #0
sta len
ldx PATHNAME
beq read_dir
floop: inc len
dex
beq copy_name
lda PATHNAME,x
eor #'/'
asl a
bne floop
;; Copy name into |self_name| buffer
copy_name:
ldy #0
cloop: iny
inx
lda PATHNAME,x
sta self_name,y
cpy len
bcc cloop
sty self_name
;; --------------------------------------------------
;; Read directory and look for .SYSTEM files; find this
;; one, and invoke the following one.
read_dir:
jsr read_block
lda data_buf + VolumeDirectoryHeader::entry_length
sta entry_length_mod
lda data_buf + VolumeDirectoryHeader::entries_per_block
sta entries_per_block_mod
lda #1
sta num
lda #<(data_buf + .sizeof(VolumeDirectoryHeader))
sta ptr
lda #>(data_buf + .sizeof(VolumeDirectoryHeader))
sta ptr+1
;; Process directory entry
entry: ldy #FileEntry::file_type ; file_type
lda (ptr),y
cmp #$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
lda data_buf + VolumeDirectoryHeader::next_block
sta read_block_params_block_num
lda data_buf + 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_buf + $04)
sta ptr
lda #>(data_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
;; 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
scrcode "\r\r* Unable to find next '.SYSTEM' file *\r"
.byte 0
bit KBDSTRB
: lda KBD
bpl :-
bit KBDSTRB
jmp quit
.endproc
;;; ------------------------------------------------------------ ;;; ------------------------------------------------------------
;;; Output a high-ascii, null-terminated string. ;;; Output a high-ascii, null-terminated string.
@ -921,126 +1042,12 @@ skip: inc ptr
rts rts
.endproc .endproc
;;; ------------------------------------------------------------
;;; COUT a 2-digit number in A
.proc cout_number
ldx #'0'|$80
cmp #10 ; >= 10?
bcc tens
;; divide by 10, dividend(+'0') in x remainder in a
: sbc #10
inx
cmp #10
bcs :-
tens: pha
cpx #'0'|$80
beq units
txa
jsr COUT
units: pla
ora #'0'|$80
jsr COUT
rts
.endproc
;;; ------------------------------------------------------------
lowercase_mask: lowercase_mask:
.byte $FF ; Set to $DF on systems w/o lower-case .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
DEFINE_QUIT_PARAMS quit_params
.endproc
;;; ------------------------------------------------------------
;;; Read a disk block.
.proc read_block
MLI_CALL READ_BLOCK, read_block_params
bcs on_error
rts
.endproc
;; block 2 is volume directory
DEFINE_READ_BLOCK_PARAMS read_block_params, data_buf, 2
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
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
;;; ------------------------------------------------------------
DEFINE_OPEN_PARAMS open_params, PATHNAME, data_buf
open_params_ref_num := open_params::ref_num
DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
read_params_ref_num := read_params::ref_num
DEFINE_CLOSE_PARAMS close_params
;;; ============================================================ ;;; ============================================================
;;; Data ;;; Scratch space beyond code used during driver install
suffix:
PASCAL_STRING ".SYSTEM"
found_self_flag:
.byte 0
;;; ============================================================
;;; Scratch space beyond code used during install
reserved_banks := * reserved_banks := *
first_used_bank := *+1 first_used_bank := *+1