mirror of
https://github.com/a2stuff/prodos-drivers.git
synced 2024-12-21 14:29:18 +00:00
Use common driver chain logic
This commit is contained in:
Joshua Bell
parent
ba0c5e53d3
commit
7cc70cd729
10
Makefile
10
Makefile
@ -4,10 +4,16 @@ LDFLAGS = --config apple2-asm.cfg
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OUTDIR = out
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HEADERS = $(wildcard inc/*.inc)
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HEADERS = $(wildcard *.inc) $(wildcard inc/*.inc)
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TARGETS = $(OUTDIR)/ram.drv.system.SYS
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# For timestamps
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MM = $(shell date "+%-m")
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DD = $(shell date "+%-d")
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YY = $(shell date "+%-y")
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DEFINES = -D DD=$(DD) -D MM=$(MM) -D YY=$(YY)
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.PHONY: clean all
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all: $(OUTDIR) $(TARGETS)
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@ -20,7 +26,7 @@ clean:
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rm -f $(TARGETS)
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$(OUTDIR)/%.o: %.s $(HEADERS)
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ca65 $(CAFLAGS) --listing $(basename $@).list -o $@ $<
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ca65 $(CAFLAGS) $(DEFINES) --listing $(basename $@).list -o $@ $<
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# System Files .SYS
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$(OUTDIR)/%.SYS: $(OUTDIR)/%.o
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@ -23,12 +23,32 @@ RDPAGE2 := $C01C
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BANKSEL := $C073 ; Select RamWorks bank
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ROMIN2 := $C082
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ROMIN2 := $C082 ; Read ROM; no write
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RWRAM1 := $C08B ; Read/write RAM bank 1
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;;; ============================================================
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;;; I/O Registers (for Slot 2)
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;;; ============================================================
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TDREG := $C088 + $20 ; ACIA Transmit Register (write)
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RDREG := $C088 + $20 ; ACIA Receive Register (read)
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STATUS := $C089 + $20 ; ACIA Status/Reset Register
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COMMAND := $C08A + $20 ; ACIA Command Register (read/write)
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CONTROL := $C08B + $20 ; ACIA Control Register (read/write)
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;;; ============================================================
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;;; Monitor ROM routines
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;;; ============================================================
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INIT := $FB2F
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HOME := $FC58
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GETLN := $FD6A ; with prompt character
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GETLN2 := $FD6F ; no prompt character
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CROUT := $FD8E
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PRBYTE := $FDDA
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COUT := $FDED
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SETNORM := $FE84
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SETKBD := $FE89
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SETVID := $FE93
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INPUT_BUFFER := $200
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@ -116,3 +116,8 @@ end:
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sta arg2+1
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.endif
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.endmacro
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;;; ============================================================
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;;; Set the high bit on the passed byte
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.define HI(c) ((c)|$80)
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395
ram.drv.system.s
395
ram.drv.system.s
@ -5,352 +5,21 @@
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;;; Modifications:
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;;; * Chain to next .SYSTEM file dynamically
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.feature string_escapes
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.setcpu "6502"
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.linecont +
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.feature string_escapes
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.include "apple2.inc"
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.include "apple2.mac"
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.include "inc/macros.inc"
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.include "inc/apple2.inc"
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.include "inc/prodos.inc"
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.include "opcodes.inc"
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.include "inc/apple2.inc"
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.include "inc/macros.inc"
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.include "inc/prodos.inc"
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;;; ============================================================
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;; SYS files load at $2000; relocates self to $1000
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.org SYS_ADDR
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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 := reloc_start
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dst := dst_addr
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ldx #(reloc_end - reloc_start + $FF) / $100 ; pages
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ldy #0
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load: lda src,y ; self-modified
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load_hi := *-1
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sta dst,y ; self-modified
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store_hi := *-1
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iny
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bne load
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inc load_hi
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inc store_hi
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dex
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bne load
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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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reloc_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 maybe_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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;;; Preserve state needed to chain to next file
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;;; ============================================================
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.proc setup
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;; --------------------------------------------------
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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 devnum
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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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ldx PATHNAME
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beq no_name
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ldy #0 ; Y = length
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: lda PATHNAME,x
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and #$7f ; ignore high bit
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cmp #'/'
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beq copy_name
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iny
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dex
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bne :-
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;; Copy name into |self_name| buffer
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copy_name:
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cpy #0
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beq no_name
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sty self_name
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ldx PATHNAME
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: lda PATHNAME,x
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sta self_name,y
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dex
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dey
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bne :-
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;; Done
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rts
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no_name:
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lda #0
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sta self_name
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rts
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.endproc
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devnum: .byte 0
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self_name: .res 16
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;;; ============================================================
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;;; Find and invoke the next .SYSTEM file
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;;; ============================================================
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.proc quit
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MLI_CALL QUIT, quit_params
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brk ; crash if QUIT fails
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DEFINE_QUIT_PARAMS quit_params
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.endproc
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online_buf := $1C00
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io_buf := $1C00
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dir_buf := $2000
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block_len = $200
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DEFINE_ON_LINE_PARAMS on_line_params,,online_buf
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DEFINE_OPEN_PARAMS open_params, PATHNAME, io_buf
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DEFINE_READ_PARAMS read_params, SYS_ADDR, SYS_LEN
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DEFINE_READ_PARAMS read_block_params, dir_buf, block_len
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DEFINE_CLOSE_PARAMS close_params
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.proc launch_next
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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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ptr := $A5
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num := $A7
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len := $A8
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;; --------------------------------------------------
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;; Own name found? If not, just quit
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lda self_name
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beq quit
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;; --------------------------------------------------
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;; Find name of boot device, copy into PATHNAME
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lda devnum
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sta on_line_params::unit_num
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MLI_CALL ON_LINE, on_line_params
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bcc :+
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jmp on_error
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: lda #'/' ; Prefix by '/'
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sta PATHNAME+1
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lda online_buf
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and #$0F ; Mask off length
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sta PATHNAME
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ldx #0 ; Copy name
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: lda online_buf+1,x
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sta PATHNAME+2,x
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inx
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cpx PATHNAME
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bne :-
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inx ; One more for '/' prefix
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stx PATHNAME
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;; Open directory
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MLI_CALL OPEN, open_params
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bcc :+
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jmp on_error
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: lda open_params::ref_num
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sta read_block_params::ref_num
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sta close_params::ref_num
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;; Read first "block"
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MLI_CALL READ, read_block_params
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bcc :+
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jmp on_error
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;; Get sizes out of header
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: lda dir_buf + VolumeDirectoryHeader::entry_length
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sta entry_length_mod
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lda dir_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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;; Set up pointers to entry
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lda #<(dir_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr
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lda #>(dir_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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;; Read next "block"
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MLI_CALL READ, read_block_params
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bcs not_found
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;; Set up pointers to entry
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lda #0
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sta num
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lda #<(dir_buf + $04)
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sta ptr
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lda #>(dir_buf + $04)
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sta ptr+1
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jmp entry
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;; --------------------------------------------------
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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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MLI_CALL CLOSE, close_params
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;; Compose the path to invoke.
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ldx PATHNAME
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inx
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lda #'/'
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sta PATHNAME,x
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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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;;; 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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;;; 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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.include "driver_preamble.inc"
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;;; ************************************************************
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;;; ============================================================
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;;;
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@ -1018,46 +687,6 @@ 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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;;; ------------------------------------------------------------
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;;; Output a high-ascii, null-terminated string.
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;;; String immediately follows the JSR.
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.proc zstrout
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ptr := $A5
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pla ; read address from stack
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sta ptr
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pla
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sta ptr+1
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bne skip ; always (since data not on ZP)
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next: cmp #'a'|$80 ; lower-case?
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bcc :+
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and lowercase_mask ; make upper-case if needed
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: jsr COUT
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skip: inc ptr
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bne :+
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inc ptr+1
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: ldy #0
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lda (ptr),y
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bne next
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lda ptr+1 ; restore address to stack
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pha
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lda ptr
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pha
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rts
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.endproc
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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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;;; Scratch space beyond code used during driver install
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@ -1070,8 +699,6 @@ stash_01 := *+2+$180 ; len: $80
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.assert stash_01+$80 < data_buf, error, "Too long"
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;;; ============================================================
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;;; End of relocated code
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poporg
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reloc_end := *
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;;; ************************************************************
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.include "driver_postamble.inc"
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;;; ************************************************************
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