mirror of
https://github.com/a2stuff/prodos-drivers.git
synced 2024-12-21 14:29:18 +00:00
Rearrange so driver is a subroutine
This commit is contained in:
Joshua Bell
parent
903cd4ff1e
commit
88472a8e11
585
ram.drv.system.s
585
ram.drv.system.s
@ -43,13 +43,14 @@ SYS_LEN = $BF00 - SYS_ADDR ; Maximum SYS file length
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dst_addr := $1000
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;;; ============================================================
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;;; Relocate from $2000 to $1000
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.proc relocate
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src := SYS_ADDR
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ldx #(sys_end - sys_start + $FF) / $100 ; pages
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ldy #0
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load: lda sys_start,y ; self-modified
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load: lda sys_start,y ; self-modified
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load_hi := *-1
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sta dst_addr,y ; self-modified
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store_hi := *-1
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@ -60,21 +61,304 @@ load: lda sys_start,y ; self-modified
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dex
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bne load
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jmp dst_addr
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jmp main
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.endproc
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;;; ============================================================
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;;; Start of relocated code
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;;;
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sys_start:
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pushorg dst_addr
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;;; ============================================================
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;;; Main routine
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;;; ============================================================
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.proc main
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jsr setup
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jsr install_driver
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jsr launch_next
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brk
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.endproc
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;;; ============================================================
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;;; Start of relocated code
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sys_start:
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pushorg dst_addr
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;;; Preserve state needed to chain to next file
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;;; ============================================================
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.proc setup
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;; Save most recent device for later, when chaining
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;; to next .SYSTEM file.
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lda DEVNUM
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sta read_block_params_unit_num
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rts
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.endproc
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jmp install_driver
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;;; ============================================================
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;;; Find and invoke the next .SYSTEM file
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;;; ============================================================
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.proc launch_next
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ptr := $A5
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num := $A7
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len := $A8
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;; --------------------------------------------------
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;; Update reset vector - now terminates.
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lda #<quit
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sta $03F2
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lda #>quit
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sta $03F3
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eor #$A5
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sta $03F4
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;; --------------------------------------------------
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;; Identify the name of this SYS file, which should be present at
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;; $280 with or without a path prefix. Search pathname buffer
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;; backwards for '/', then copy name into |self_name|.
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;; Find '/' (which may not be present, prefix is optional)
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lda #0
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sta len
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ldx PATHNAME
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beq read_dir
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floop: inc len
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dex
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beq copy_name
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lda PATHNAME,x
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eor #'/'
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asl a
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bne floop
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;; Copy name into |self_name| buffer
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copy_name:
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ldy #0
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cloop: iny
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inx
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lda PATHNAME,x
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sta self_name,y
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cpy len
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bcc cloop
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sty self_name
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;; --------------------------------------------------
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;; Read directory and look for .SYSTEM files; find this
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;; one, and invoke the following one.
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read_dir:
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jsr read_block
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lda data_buf + VolumeDirectoryHeader::entry_length
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sta entry_length_mod
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lda data_buf + VolumeDirectoryHeader::entries_per_block
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sta entries_per_block_mod
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lda #1
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sta num
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lda #<(data_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr
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lda #>(data_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr+1
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;; Process directory entry
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entry: ldy #FileEntry::file_type ; file_type
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lda (ptr),y
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cmp #$FF ; type=SYS
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bne next
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ldy #FileEntry::storage_type_name_length
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lda (ptr),y
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and #$30 ; regular file (not directory, pascal)
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beq next
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lda (ptr),y
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and #$0F ; name_length
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sta len
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tay
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;; Compare suffix - is it .SYSTEM?
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ldx suffix
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: lda (ptr),y
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cmp suffix,x
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bne next
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dey
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dex
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bne :-
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;; Yes; is it *this* .SYSTEM file?
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ldy self_name
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cpy len
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bne handle_sys_file
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: lda (ptr),y
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cmp self_name,y
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bne handle_sys_file
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dey
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bne :-
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sec
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ror found_self_flag
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;; Move to the next entry
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next: lda ptr
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clc
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adc #$27 ; self-modified: entry_length
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entry_length_mod := *-1
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sta ptr
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bcc :+
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inc ptr+1
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: inc num
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lda num
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cmp #$0D ; self-modified: entries_per_block
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entries_per_block_mod := *-1
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bcc entry
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lda data_buf + VolumeDirectoryHeader::next_block
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sta read_block_params_block_num
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lda data_buf + VolumeDirectoryHeader::next_block + 1
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sta read_block_params_block_num+1
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ora read_block_params_block_num
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beq not_found ; last block has next=0
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jsr read_block
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lda #0
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sta num
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lda #<(data_buf + $04)
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sta ptr
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lda #>(data_buf + $04)
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sta ptr+1
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jmp entry
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;; Found a .SYSTEM file which is not this one; invoke
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;; it if follows this one.
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handle_sys_file:
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bit found_self_flag
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bpl next
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;; Compose the path to invoke. First walk self path
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;; backwards to '/'.
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ldx PATHNAME
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beq append
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: dex
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beq append
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lda PATHNAME,x
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eor #'/'
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asl a
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bne :-
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;; Now append name of found file.
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append: ldy #0
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: iny
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inx
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lda (ptr),y
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sta PATHNAME,x
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cpy len
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bcc :-
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stx PATHNAME
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jmp invoke_system_file
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not_found:
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jsr zstrout
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scrcode "\r\r* Unable to find next '.SYSTEM' file *\r"
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.byte 0
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bit KBDSTRB
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: lda KBD
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bpl :-
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bit KBDSTRB
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jmp quit
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.endproc
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;;; ------------------------------------------------------------
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;;; Invoke ProDOS QUIT routine.
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.proc quit
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MLI_CALL QUIT, quit_params
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.byte 0 ; crash if QUIT fails
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rts
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DEFINE_QUIT_PARAMS quit_params
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.endproc
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;;; ------------------------------------------------------------
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;;; Read a disk block.
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.proc read_block
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MLI_CALL READ_BLOCK, read_block_params
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bcs on_error
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rts
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.endproc
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;; block 2 is volume directory
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DEFINE_READ_BLOCK_PARAMS read_block_params, data_buf, 2
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read_block_params_unit_num := read_block_params::unit_num
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read_block_params_block_num := read_block_params::block_num
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;;; ------------------------------------------------------------
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;;; Load/execute the system file in PATHNAME
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.proc invoke_system_file
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MLI_CALL OPEN, open_params
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bcs on_error
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lda open_params_ref_num
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sta read_params_ref_num
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MLI_CALL READ, read_params
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bcs on_error
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MLI_CALL CLOSE, close_params
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bcs on_error
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jmp SYS_ADDR ; Invoke loaded SYSTEM file
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.endproc
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;;; ------------------------------------------------------------
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;;; Error handler - invoked if any ProDOS error occurs.
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.proc on_error
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pha
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jsr zstrout
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scrcode "\r\r* Disk Error $"
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.byte 0
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pla
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jsr PRBYTE
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jsr zstrout
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scrcode " *\r"
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.byte 0
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bit KBDSTRB
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: lda KBD
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bpl :-
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bit KBDSTRB
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jmp quit
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.endproc
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;;; ------------------------------------------------------------
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DEFINE_OPEN_PARAMS open_params, PATHNAME, data_buf
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open_params_ref_num := open_params::ref_num
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DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
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read_params_ref_num := read_params::ref_num
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DEFINE_CLOSE_PARAMS close_params
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;;; ============================================================
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;;; Data
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suffix:
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PASCAL_STRING ".SYSTEM"
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found_self_flag:
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.byte 0
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;;; ============================================================
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;;;
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;;; Driver
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;;;
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;;; ============================================================
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;;; ============================================================
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;;; Configuration Parameters
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@ -449,7 +733,7 @@ install_success:
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scrcode "\r\r\r", PRODUCT, " - Installed"
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.byte 0
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jmp launch_next_sys_file
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rts
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install_failure:
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sta ALTZPOFF
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@ -459,7 +743,7 @@ install_failure:
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scrcode "\r\r\r", PRODUCT, " - Not Installed"
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.byte 0
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jmp launch_next_sys_file
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rts
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;;; ============================================================
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;;; Installed on zero page of each bank at $B0
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@ -722,173 +1006,10 @@ bank_list:
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driver_block_x := driver_src + driver_src::driver_block_x - driver_src::driver_start
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driver_bank_list := driver_src + driver_src::bank_list - driver_src::driver_start
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;;; ============================================================
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;;; Common Routines
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;;; ============================================================
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;;; Find and invoke the next .SYSTEM file
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.proc launch_next_sys_file
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ptr := $A5
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num := $A7
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len := $A8
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;; --------------------------------------------------
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;; Update reset vector - now terminates.
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lda #<quit
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sta $03F2
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lda #>quit
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sta $03F3
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eor #$A5
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sta $03F4
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;; --------------------------------------------------
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;; Identify the name of this SYS file, which should be present at
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;; $280 with or without a path prefix. Search pathname buffer
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;; backwards for '/', then copy name into |self_name|.
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;; Find '/' (which may not be present, prefix is optional)
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lda #0
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sta len
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ldx PATHNAME
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beq read_dir
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floop: inc len
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dex
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beq copy_name
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lda PATHNAME,x
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eor #'/'
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asl a
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bne floop
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;; Copy name into |self_name| buffer
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copy_name:
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ldy #0
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cloop: iny
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inx
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lda PATHNAME,x
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sta self_name,y
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cpy len
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bcc cloop
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sty self_name
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;; --------------------------------------------------
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;; Read directory and look for .SYSTEM files; find this
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;; one, and invoke the following one.
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read_dir:
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jsr read_block
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lda data_buf + VolumeDirectoryHeader::entry_length
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sta entry_length_mod
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lda data_buf + VolumeDirectoryHeader::entries_per_block
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sta entries_per_block_mod
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lda #1
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sta num
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lda #<(data_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr
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lda #>(data_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr+1
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;; Process directory entry
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entry: ldy #FileEntry::file_type ; file_type
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lda (ptr),y
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cmp #$FF ; type=SYS
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bne next
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ldy #FileEntry::storage_type_name_length
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lda (ptr),y
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and #$30 ; regular file (not directory, pascal)
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beq next
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lda (ptr),y
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and #$0F ; name_length
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sta len
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tay
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;; Compare suffix - is it .SYSTEM?
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ldx suffix
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: lda (ptr),y
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cmp suffix,x
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bne next
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dey
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dex
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bne :-
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;; Yes; is it *this* .SYSTEM file?
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ldy self_name
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cpy len
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bne handle_sys_file
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: lda (ptr),y
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cmp self_name,y
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bne handle_sys_file
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dey
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bne :-
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sec
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ror found_self_flag
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;; Move to the next entry
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next: lda ptr
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clc
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adc #$27 ; self-modified: entry_length
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entry_length_mod := *-1
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sta ptr
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bcc :+
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inc ptr+1
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: inc num
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lda num
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cmp #$0D ; self-modified: entries_per_block
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entries_per_block_mod := *-1
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bcc entry
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lda data_buf + VolumeDirectoryHeader::next_block
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sta read_block_params_block_num
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lda data_buf + VolumeDirectoryHeader::next_block + 1
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sta read_block_params_block_num+1
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ora read_block_params_block_num
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beq not_found ; last block has next=0
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jsr read_block
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lda #0
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sta num
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lda #<(data_buf + $04)
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sta ptr
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lda #>(data_buf + $04)
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sta ptr+1
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jmp entry
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;; Found a .SYSTEM file which is not this one; invoke
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;; it if follows this one.
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handle_sys_file:
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bit found_self_flag
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bpl next
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;; Compose the path to invoke. First walk self path
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;; backwards to '/'.
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ldx PATHNAME
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beq append
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: dex
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beq append
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lda PATHNAME,x
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eor #'/'
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asl a
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bne :-
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;; Now append name of found file.
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append: ldy #0
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: iny
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inx
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lda (ptr),y
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sta PATHNAME,x
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cpy len
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bcc :-
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stx PATHNAME
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jmp invoke_system_file
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not_found:
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jsr zstrout
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scrcode "\r\r* Unable to find next '.SYSTEM' file *\r"
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.byte 0
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bit KBDSTRB
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: lda KBD
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bpl :-
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bit KBDSTRB
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jmp quit
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.endproc
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;;; ------------------------------------------------------------
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;;; Output a high-ascii, null-terminated string.
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@ -921,126 +1042,12 @@ skip: inc ptr
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rts
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.endproc
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;;; ------------------------------------------------------------
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;;; COUT a 2-digit number in A
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.proc cout_number
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ldx #'0'|$80
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cmp #10 ; >= 10?
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bcc tens
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;; divide by 10, dividend(+'0') in x remainder in a
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: sbc #10
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inx
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cmp #10
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bcs :-
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tens: pha
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cpx #'0'|$80
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beq units
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txa
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jsr COUT
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units: pla
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ora #'0'|$80
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jsr COUT
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rts
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.endproc
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;;; ------------------------------------------------------------
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lowercase_mask:
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.byte $FF ; Set to $DF on systems w/o lower-case
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;;; ------------------------------------------------------------
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;;; Invoke ProDOS QUIT routine.
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.proc quit
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MLI_CALL QUIT, quit_params
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.byte 0 ; crash if QUIT fails
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rts
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DEFINE_QUIT_PARAMS quit_params
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.endproc
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;;; ------------------------------------------------------------
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;;; Read a disk block.
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.proc read_block
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MLI_CALL READ_BLOCK, read_block_params
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bcs on_error
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rts
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.endproc
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|
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;; 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
|
||||
|
||||
|
||||
;;; ============================================================
|
||||
;;; Scratch space beyond code used during install
|
||||
;;; Scratch space beyond code used during driver install
|
||||
|
||||
reserved_banks := *
|
||||
first_used_bank := *+1
|
||||
|
||||
Loading…
Reference in New Issue
Block a user