mirror of
https://github.com/a2stuff/prodos-drivers.git
synced 2024-12-21 14:29:18 +00:00
Fix chaining
This commit is contained in:
Joshua Bell
parent
d115882280
commit
903cd4ff1e
@ -29,5 +29,6 @@ ROMIN2 := $C082
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;;; Monitor ROM routines
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;;; ============================================================
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HOME := $FC58
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PRBYTE := $FDDA
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COUT := $FDED
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@ -135,15 +135,6 @@ ERR_NETWORK_ERROR = $88
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STORAGE_TYPE_MASK = $F0
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NAME_LENGTH_MASK = $0F
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;;; Volume Directory Block Header structure
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.scope VolumeDirectoryBlockHeader
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prev_block := $00
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next_block := $02
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entry_length := $23
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entries_per_block := $24
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header_length := $2B
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.endscope
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;;; Volume Directory Header structure
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.struct VolumeDirectoryHeader
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prev_block .word
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224
ram.drv.system.s
224
ram.drv.system.s
@ -2,7 +2,10 @@
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;;; Based on Glen E. Bredon's "RAM.DRV.SYSTEM"
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;;; Some details c/o http://boutillon.free.fr/Underground/Outils/Ram_Drv_System/Ram_Drv_System.html
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;;;
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;;; Modifications to chain to next .SYSTEM file
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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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@ -21,18 +24,19 @@ zpproc_relay_addr := $2D0
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PATHNAME := $280
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data_buffer := $1800 ; I/O when chaining to next SYS file
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data_buf := $1C00 ; I/O when chaining to next SYS file
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driver_target := $FF00 ; Install location in ProDOS
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kMaxUsableBanks = 24 ; Why is this capped so low???
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; (driver has room for another ~20?)
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SYS_ADDR := $2000 ; Load address for SYS files
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SYS_ADDR := $2000 ; Load address for SYS files
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SYS_LEN = $BF00 - SYS_ADDR ; Maximum SYS file length
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;;; ============================================================
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.define PRODUCT "RAMWorks RAM Disk"
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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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@ -42,70 +46,41 @@ SYS_LEN = $BF00 - SYS_ADDR ; Maximum SYS file length
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.proc relocate
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src := SYS_ADDR
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dst := $1000
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ldx #(sys_end - sys_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: lda sys_start,y ; self-modified
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load_hi := *-1
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sta dst,y ; self-modified
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sta dst_addr,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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beq find_self_name ; done
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jmp load
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bne load
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jmp dst_addr
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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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;; 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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jmp install_driver
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;;; ============================================================
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;;; Configuration Parameters
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banks_to_reserve: .byte 0 ; banks to reserve (e.g. for AppleWorks)
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slot: .byte 3 ; S3D1; could be $B for S3D2
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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. This is used when searching
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;;; for the next .SYSTEM file to execute.
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.proc find_self_name
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;; Search pathname buffer backwards for '/', then
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;; copy name into |self_name|; this is used later
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;; to find/invoke the next .SYSTEM file.
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;; Find '/' (which may not be present, prefix is optional)
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lda #0
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sta $A8
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ldx PATHNAME
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beq install_driver
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floop: inc $A8
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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 $A8
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bcc cloop
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sty self_name
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.endproc
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;; Fall through...
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banks_to_reserve: .byte 0 ; banks to reserve (e.g. for AppleWorks)
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unitnum: .byte $03 ; S3D1; could be $B for S3D2
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;;; ============================================================
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;;; Install the driver
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@ -275,7 +250,7 @@ break:
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bmi L21F0
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jmp do_install
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fail: jmp do_chain
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fail: jmp install_failure
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sloop: lda sig,x
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set_sig:
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@ -389,14 +364,14 @@ copy_driver:
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cpy #sizeof_driver
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bcc :-
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;; Check if slot already has a device
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;; Check if unitnum already has a device
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ldy DEVCNT
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: lda DEVLST,y
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lsr a
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lsr a
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lsr a
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lsr a
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cmp slot
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cmp unitnum
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beq install_device
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dey
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bpl :-
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@ -412,7 +387,7 @@ copy_driver:
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;; Install device in ProDOS via DEVLST/DEVADR.
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;; (Y has index in DEVLST)
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install_device:
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lda slot
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lda unitnum
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asl a
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tax
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asl a
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@ -424,7 +399,7 @@ install_device:
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copy16 #(driver_target+1), DEVADR,x
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;; Did we install into S3D2?
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lda slot
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lda unitnum
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cmp #$0B ; Slot 3 Drive 2
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beq finish
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@ -456,8 +431,8 @@ finish: bit ROMIN2
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ldx #$00
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lda on_line_params_buffer
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ora L239F
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bne do_chain
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bcc do_chain
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bne install_success
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bcc install_success
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copy #$FF, L239F
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sta ALTZPON
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copy driver_bank_list, BANKSEL
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@ -466,8 +441,24 @@ finish: bit ROMIN2
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stx vol_dir_header+VolumeDirectoryHeader::total_blocks
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jmp install_driver ; retry???
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do_chain:
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install_success:
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sta ALTZPOFF
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jsr HOME
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jsr zstrout
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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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install_failure:
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sta ALTZPOFF
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jsr HOME
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jsr zstrout
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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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;;; ============================================================
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@ -735,6 +726,11 @@ bank_list:
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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 $03F2
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@ -743,24 +739,51 @@ bank_list:
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eor #$A5
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sta $03F4
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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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;; 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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lda DEVNUM ; stick with most recent device
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sta read_block_params_unit_num
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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_buffer + VolumeDirectoryBlockHeader::entry_length
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lda data_buf + VolumeDirectoryHeader::entry_length
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sta entry_length_mod
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lda data_buffer + VolumeDirectoryBlockHeader::entries_per_block
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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_buffer + VolumeDirectoryBlockHeader::header_length)
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lda #<(data_buf + .sizeof(VolumeDirectoryHeader))
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sta ptr
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lda #>(data_buffer + VolumeDirectoryBlockHeader::header_length)
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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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@ -780,11 +803,11 @@ entry: ldy #FileEntry::file_type ; file_type
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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+1,x
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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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bpl :-
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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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@ -812,18 +835,18 @@ next: lda ptr
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entries_per_block_mod := *-1
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bcc entry
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lda data_buffer + VolumeDirectoryBlockHeader::next_block
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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_buffer + VolumeDirectoryBlockHeader::next_block + 1
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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_buffer + $04)
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lda #<(data_buf + $04)
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sta ptr
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lda #>(data_buffer + $04)
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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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@ -857,7 +880,9 @@ append: ldy #0
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not_found:
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jsr zstrout
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scrcode "\r\r\r* Unable to find next '.SYSTEM' file *\r"
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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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@ -935,13 +960,7 @@ lowercase_mask:
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.byte 0 ; crash if QUIT fails
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rts
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.proc quit_params
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.byte 4 ; param_count
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.byte 0 ; quit_type
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.word 0000 ; reserved
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.byte 0 ; reserved
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.word 0000 ; reserved
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.endproc
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DEFINE_QUIT_PARAMS quit_params
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.endproc
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;;; ------------------------------------------------------------
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@ -953,12 +972,8 @@ lowercase_mask:
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rts
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.endproc
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.proc read_block_params
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.byte 3 ; param_count
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unit_num: .byte $60 ; unit_num
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.addr data_buffer ; data_buffer
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block_num: .word 2 ; block_num - block 2 is volume directory
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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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@ -987,11 +1002,16 @@ block_num: .word 2 ; block_num - block 2 is volume directory
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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\r** Disk Error $"
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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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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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@ -1001,27 +1021,13 @@ block_num: .word 2 ; block_num - block 2 is volume directory
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;;; ------------------------------------------------------------
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.proc open_params
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.byte 3 ; param_count
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.addr PATHNAME ; pathname
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.addr data_buffer ; io_buffer
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ref_num:.byte 1 ; ref_num
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.endproc
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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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.proc read_params
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.byte 4 ; param_count
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ref_num:.byte 1 ; ref_num
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.addr SYS_ADDR ; data_buffer
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.word SYS_LEN ; request_count
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.word 0 ; trans_count
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.endproc
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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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.proc close_params
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.byte 1 ; param_count
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ref_num:.byte 0 ; ref_num
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.endproc
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DEFINE_CLOSE_PARAMS close_params
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;;; ============================================================
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;;; Data
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@ -1032,9 +1038,6 @@ suffix:
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found_self_flag:
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.byte 0
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;;; ============================================================
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;;; End of relocated code
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sys_end:
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;;; ============================================================
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;;; Scratch space beyond code used during install
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@ -1046,3 +1049,10 @@ map2 := *+2+$80 ; len: $80
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stash_00 := *+2+$100 ; len: $80
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stash_01 := *+2+$180 ; len: $80
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self_name := *+2+$200 ; len: 65
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.assert self_name + 64 < 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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sys_end:
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