1008 lines
11 KiB
Plaintext
1008 lines
11 KiB
Plaintext
;
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;
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; loader
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;
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include 'hfs.aii'
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include 'macros.aii'
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include 'e16.gsos'
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string asis
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blanks on
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__smartport__ set 0
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buffer equ $3000
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dp record 0
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ptr ds.l 1
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path ds.l 1
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r0 ds.w 1
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r1 ds.w 1
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r2 ds.w 1
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r3 ds.w 1
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; readfile
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eof ds.l 1
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blocks ds.w 1 ; shouldn't exceed...
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ft ds.w 1
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at ds.w 1
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st ds.w 1
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file_id ds.l 1
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endr
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if __smartport__ then
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sp record $20
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ReadBlock equ $01
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pcount ds.b 1
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unit ds.b 1
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buffer ds.w 1
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block ds.l 1 ; actually 24-bit
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endr
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else
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pro record $42
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cmd ds.b 1
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unit ds.b 1
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buffer ds.b 2
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block ds.b 2
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endr
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endif
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entry read_block, read_block_abs
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entry prepare_path, cat_lookup
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entry read_cat_block, read_file_block
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header proc
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import readfile, getbootname, getfstname, startup
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entry auxtype
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jmp startup
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nop
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dc.w readfile
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dc.w getbootname
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dc.w getfstname
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dc.w startup-header ; size of permanent code
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auxtype dc.w 0
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endp
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data record
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; store catalog info
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slot dc.w 0
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unit dc.w 0
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vector dc.w 0
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block_offset dc.w 0
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cat_extents dcb.w 6, 0
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file_extents dcb.w 6, 0
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cat_root dc.w 0
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system_id dc.l 0
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fsts_id dc.l 0
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drivers_id dc.l 0
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; ctree lookup
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target_parent dc.l 0
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target_str_len dc.w 0
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target_str dcb.b 32, 0
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cat_str_len dc.w 0
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cat_str dcb.b 32, 0
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endr
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getbootname proc
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; getbootname(GSString *)
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with dp
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plx ; rts
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ply
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sty ptr
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ply
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sty ptr+2
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phx
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phb
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phk
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plb
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; get the volume name from the HFS MDB....
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lda #buffer
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sta pro.buffer
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lda #2
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jsr read_block_abs
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bcs exit
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with HFSMasterDirectoryBlock
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lda buffer+drVN
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and #$ff
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sta [ptr]
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inc a
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lsr a
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tax ; count
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dex
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ldy #2
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@loop lda buffer+drVN-1,y
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sta [ptr],y
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iny
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iny
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dex
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bpl @loop
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clc
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lda #0
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exit
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plb
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rts
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endp
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getfstname proc
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; getfstname(GSString *)
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with dp
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plx ; rts
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ply
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sty ptr
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ply
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sty ptr+2
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phx
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phb
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phk
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plb
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ldy #10-2 ; 7 + 2 + 1 byte to round up.
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@loop lda name,y
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sta [ptr],y
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dey
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dey
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bpl @loop
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plb
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clc
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lda #0
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rts
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name str.w 'hfs.fst'
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dcb.b 1,0
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endp
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readfile proc
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; (eof, aux type, file type) readfile(GSString *, void *)
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with dp
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plx ; rts
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ply
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sty ptr ; data buffer
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ply
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sty ptr+2
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ply
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sty path ; pathname
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ply
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sty path+2
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phx
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phb
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phk
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plb
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jsr prepare_path
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bcs exit
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jsr cat_lookup
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bcs exit
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; now read file, one block at a time,
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; and copy to ptr.
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lda blocks
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beq rdone
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stz r0 ; block
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@rloop
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lda r0
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jsr read_file_block
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bcs exit
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; copy to destination
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pea buffer>>16 ; src
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pea buffer
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pei ptr+2 ; dest
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pei ptr
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pea 0 ; count
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pea 512
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_BlockMove
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lda ptr
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clc
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adc #512
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sta ptr
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lda ptr+2
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adc #0
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sta ptr+2
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inc r0
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dec blocks
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bne @rloop
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rdone
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; ...
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; stack: b, rts,
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lda ft
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sta 4,s
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lda at
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sta 6,s
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lda eof
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sta 8,s
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lda eof+2
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sta 10,s
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lda #0
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clc
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exit
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plb
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rts
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endp
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prepare_path proc
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with dp, data
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; optimism
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stz r0 ; offset into path
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lda system_id
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sta target_parent
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sta system_id+2
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sta target_parent+2
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lda [path]
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cmp #8
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blt err
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; SYSTEM ?
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ldx #3
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@loop
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lda [path],y
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cmp s1,y
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bne err
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iny
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iny
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dex
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bne @loop
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lda [path],y
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iny
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sty r0
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cmp #'D:'
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beq d
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cmp #'F:'
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beq f
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and #$ff
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cmp #':'
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beq sys
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err lda #fileNotFound
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sec
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rts
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sys brl target
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; check for more ':' ?
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d ; check for a driver folder.
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lda [path]
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cmp #16
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blt sys
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ldx #4
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@loop lda [path],y
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cmp s2,y
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bne sys
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iny
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iny
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dex
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bne @loop
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; match!
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sty r0
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lda drivers_id
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sta target_parent
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lda drivers_id+2
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sta target_parent+2
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brl target
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f ; check for FSTs folder
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lda [path]
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cmp #13
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blt sys
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ldx #2
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@loop lda [path],y
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cmp s3,y
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bne sys
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iny
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iny
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dex
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bne @loop
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lda [path],y
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and #$ff
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cmp #':'
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bne sys
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iny
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sty r0
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lda fsts_id
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sta target_parent
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lda fsts_id+2
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sta target_parent+2
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; drop through
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target
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; now set target_str / len
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lda [path]
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sec
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sbc r0
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beq fnf ; close enough
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sta target_str_len
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cmp #16
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bcs fnf
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ldx #30
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@zloop stz target_str,x
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dex
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dex
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bpl @zloop
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short m
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ldx #0
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@loop
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lda [path],y
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cmp #':'
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beq fnf
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cmp #'z'+1
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bge @next
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cmp #'a'
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blt @next
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and #$ff xor $20
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@next sta target_str_len,x
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iny
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inx
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cpx target_str_len
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blt @loop
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long m
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lda #0
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clc
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rts
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fnf long m
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lda #fileNotFound
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sec
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rts
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s1 dc.b 'xxSYSTEM:'
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s2 dc.b 'xxSYSTEM:DRIVERS:'
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s3 dc.b 'xxSYSTEM:FSTS:'
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endp
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read_block proc
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entry read_block_abs
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entry vector
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; input
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; a = hfs block #
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; will be adjusted for allocation block offset
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;
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with dp
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clc
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adc data.block_offset
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read_block_abs
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; todo -- need to save/restore dp and stack
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if __smartport__ then
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sta sp.block
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else
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sta pro.block
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endif
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php
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sec
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xce
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dc.b $20 ; jsr
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vector dc.w $ffff
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if __smartport__ then
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dc.b sp.ReadBlock
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dc.w sp
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endif
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bcs @fail
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xce
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plp
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rts
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@fail
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clc
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xce
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plp
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sec
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rts
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endp
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cat_lookup proc
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with data
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bnum equ dp.r0
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prev equ dp.r1
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count equ dp.r2
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; search for a file and a parent directory.
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lda cat_root
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sta bnum
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ix
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ldx #-1
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stx prev
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lda bnum
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jsr read_cat_block
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bcc @ok
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rts ; uhoh
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@ok
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lda buffer+BTNodeDescriptor.numRecords
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beq advance
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sta count
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ldx #512-2 ; last entry
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eloop
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lda buffer,x ; entry offset
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xba
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tay
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lda data+HFSCatalogKey.parentID,y
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xba
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cmp target_parent+2
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beq @p2
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blt @lt
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bge @gt
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@p2 lda data+HFSCatalogKey.parentID+2,y
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xba
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cmp target_parent
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beq @nm
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blt @lt
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bge @gt
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@gt
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; if this is an index node,
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; we overshot, so follow the tree via prev
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; to the next level.
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lda buffer+BTNodeDescriptor.kind-1
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bmi nope ; index map
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lda prev
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bmi nope
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sta bnum
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bra ix
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; now do a name check....
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; target_name is UPPER CASE
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@nm
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jsr name_check
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cmp #0
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beq @found
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bmi @lt
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bra @gt
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@found
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; a match! if this is an index node,
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; descend....
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lda buffer+BTNodeDescriptor.kind-1
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bmi @leaf
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lda data+38+2,y
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xba
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sta bnum
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bra ix
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@leaf jmp match
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; if this is an index node, keep it for later
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@lt lda data+38+2,y
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xba
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sta prev
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@next
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dex
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dex
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dec count
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bne eloop
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advance
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lda data+BTNodeDescriptor.fLink
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beq nope
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xba
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sta bnum
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bra ix
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nope
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lda #fileNotFound
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sec
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rts
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name_check
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; copy into catstr and upper case it.
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phx
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phy ; save
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;
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; we need to handle 0-length strings (folder threads)
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;
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ldx #30
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@zloop stz cat_str,x
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dex
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dex
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bpl @zloop
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stz cat_str_len
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ldx #0
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short m
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lda data+HFSCatalogKey.nodeName,y
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sta cat_str_len
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@loop
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lda data+HFSCatalogKey.nodeName+1,y
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sta cat_str,x
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iny
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inx
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cpx cat_str_len
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blt @loop
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upper
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; now uppercase it
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ldy #0
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ldx cat_str_len
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dex
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@loop lda cat_str,y
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cmp #'z'+1
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bge @next
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cmp #'a'
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blt @next
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and #$ff xor $20
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sta cat_str,y
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@next iny
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dex
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bpl @loop
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cmp
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ldx target_str_len
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cpx cat_str_len
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bge @ok
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ldx cat_str_len
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@ok
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dex
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ldy #0
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@loop
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lda target_str,y
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cmp cat_str,y
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beq @next
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blt lt
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bge gt
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@next
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iny
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bpl @loop
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long m
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lda #0
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bra exit
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lt long m
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lda #-1
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bra exit
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gt long m
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lda #1
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exit
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ply
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plx
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match ; a match!
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; store the file type, aux type, eof, and extent pointers.
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; a match!
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with dp
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lda buffer+HFSCatalogKey.keyLength,y
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and #$ff
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inc a ; doesn't include itself
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clc
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adc buffer,x ; x still valid
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tay
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lda buffer+HFSCatalogFile.recordType
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xba
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cmp #kHFSFolderRecord
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beq folder
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cmp #kHFSFileRecord
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beq file
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; folder thread, file thread.... invalid for us.
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lda #fileNotFound
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sec
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rts
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folder
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with HFSCatalogFolder
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stz eof
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stz eof+2
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stz blocks
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stz at
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lda #$f
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sta ft
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lda #$0d
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sta st ; storage type
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ldx #12-2
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@eloop
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stz file_extents,x
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dex
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dex
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bpl @eloop
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lda data+folderID+2,y
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xba
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sta file_id
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lda data+folderID,y
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xba
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sta file_id+2
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lda #0
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clc
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rts
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endwith
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file
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with HFSCatalogFile
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lda buffer+dataLogicalSize+2,y
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xba
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sta eof
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lda buffer+dataLogicalSize,y
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xba
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sta eof+2
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; blocks
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; update if variable block size?
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lda buffer+dataPhysicalSize+2,y
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; xba
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lsr a ; >>9 since already xba
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and #%01111111
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sta blocks
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lda #1
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sta st ; storage type
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lda buffer+dataExtents+0,y
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xba
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stz file_extents+0
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|
|
|
lda buffer+dataExtents+2,y
|
|
xba
|
|
stz file_extents+2
|
|
|
|
lda buffer+dataExtents+4,y
|
|
xba
|
|
stz file_extents+4
|
|
|
|
lda buffer+dataExtents+6,y
|
|
xba
|
|
stz file_extents+6
|
|
|
|
lda buffer+dataExtents+8,y
|
|
xba
|
|
stz file_extents+8
|
|
|
|
lda buffer+dataExtents+10,y
|
|
xba
|
|
stz file_extents+10
|
|
|
|
lda data+fileID+2,y
|
|
xba
|
|
sta file_id
|
|
lda data+fileID,y
|
|
xba
|
|
sta file_id+2
|
|
|
|
; file type aux type logic.
|
|
; only support pdos encoding, nothing fancy.
|
|
; 'p' filetype aux type pdos
|
|
; where filetype = 80bit, aux type = 16 bit big endian
|
|
|
|
stz ft
|
|
stz at
|
|
lda data+userInfo+4,y
|
|
cmp #'dp'
|
|
bne noft
|
|
lda data+userInfo+4+2,y
|
|
cmp #'so'
|
|
bne noft
|
|
pdos
|
|
lda data+userInfo,y
|
|
tax
|
|
and #$ff
|
|
cmp #'p'
|
|
bne noft
|
|
txa
|
|
xba
|
|
and #$ff
|
|
sta ft
|
|
lda data+userInfo+2,y
|
|
xba
|
|
sta at
|
|
noft
|
|
|
|
lda #0
|
|
clc
|
|
rts
|
|
endwith
|
|
|
|
endp
|
|
|
|
|
|
macro
|
|
&lab ifc_fail &str
|
|
&lab bcc @ok
|
|
pha
|
|
pea @str>>16
|
|
pea @str
|
|
_SysFailMgr
|
|
brk $ea
|
|
@str str.b &str
|
|
@ok
|
|
mend
|
|
|
|
;
|
|
; everything below here will be clobbered.
|
|
;
|
|
startup proc
|
|
;
|
|
; load the catalog extents
|
|
; lookup :system, :system:driver, :system:fsts, system:system:setup folders to save time later?
|
|
;
|
|
;
|
|
|
|
; read :system:start.gsos, load into memory @ $6800
|
|
; aux type is stored in auxtype
|
|
|
|
with dp, data
|
|
|
|
; assume 16-bit, etc.
|
|
|
|
stx slot
|
|
sty vector
|
|
sta unit
|
|
|
|
lda #0
|
|
tcd
|
|
ldx #$1ff
|
|
txs
|
|
|
|
|
|
with HFSMasterDirectoryBlock
|
|
lda #2
|
|
jsr read_block_abs
|
|
; can't really fail...
|
|
lda buffer+drAlBlSt
|
|
xba
|
|
sta block_offset
|
|
|
|
ldx #3*HFSExtentDescriptor.sizeof-2
|
|
@cloop lda buffer+drCTExtRec,x
|
|
xba
|
|
sta cat_extents,x
|
|
dex
|
|
dex
|
|
bpl @cloop
|
|
|
|
; save the volume name while we're at it?
|
|
|
|
endwith
|
|
|
|
; find the root node.
|
|
lda cat_extents
|
|
jsr read_block
|
|
|
|
with BTHeaderRec
|
|
lda data+BTNodeDescriptor.sizeof+rootNode+2
|
|
xba
|
|
sta cat_root
|
|
|
|
;
|
|
; lookup SYSTEM
|
|
;
|
|
lda #kHFSRootFolderID
|
|
sta target_parent
|
|
lda #kHFSRootFolderID>>16
|
|
stz target_parent+2
|
|
ldx #30
|
|
@zloop stz target_str,x
|
|
dex
|
|
dex
|
|
bpl @zloop
|
|
|
|
ldx #14-2
|
|
sloop
|
|
lda sys,x
|
|
sta target_str_len,x
|
|
dex
|
|
dex
|
|
bpl sloop
|
|
|
|
jsr cat_lookup
|
|
ifc_fail 'Unable to locate System folder. Error=$'
|
|
|
|
; also check if dir?
|
|
|
|
lda file_id
|
|
sta system_id
|
|
sta target_parent
|
|
lda file_id+2
|
|
sta system_id+2
|
|
sta target_parent+2
|
|
|
|
; lookup System:FSTs
|
|
|
|
ldx #14-2
|
|
floop
|
|
lda fsts,x
|
|
sta target_str_len,x
|
|
dex
|
|
dex
|
|
bpl floop
|
|
|
|
jsr cat_lookup
|
|
ifc_fail 'Unable to locate System:FSTs folder. Error=$'
|
|
|
|
; also check if dir?
|
|
|
|
lda file_id
|
|
sta fsts_id
|
|
lda file_id+2
|
|
sta fsts_id+2
|
|
|
|
; lookup System:Drivers
|
|
|
|
ldx #14-2
|
|
dloop
|
|
lda drv,x
|
|
sta target_str_len,x
|
|
dex
|
|
dex
|
|
bpl dloop
|
|
|
|
jsr cat_lookup
|
|
ifc_fail 'Unable to locate System:Drivers folder. Error=$'
|
|
|
|
; also check if dir?
|
|
|
|
lda file_id
|
|
sta drivers_id
|
|
lda file_id+2
|
|
sta drivers_id+2
|
|
|
|
|
|
; lookup System:Start.GS.OS
|
|
ldx #14-2
|
|
@gloop
|
|
lda gsos,x
|
|
sta target_str_len,x
|
|
dex
|
|
dex
|
|
bpl @gloop
|
|
|
|
jsr cat_lookup
|
|
ifc_fail 'Unable to locate System:Start.GS.OS. Error=$'
|
|
|
|
|
|
|
|
read
|
|
stz r0
|
|
lda blocks
|
|
beq bad
|
|
|
|
lda #$6800
|
|
sta pro.buffer
|
|
|
|
@loop lda r0
|
|
jsr read_file_block
|
|
bcs bad
|
|
lda pro.buffer
|
|
; clc
|
|
adc #512
|
|
sta pro.buffer
|
|
inc r0
|
|
dec blocks
|
|
bne @loop
|
|
|
|
|
|
lda at
|
|
sta auxtype
|
|
|
|
jmp $6800
|
|
|
|
bad pha
|
|
pea @str>>16
|
|
pea @str
|
|
_SysFailMgr
|
|
brk $ea
|
|
@str str.b 'Error reading Start.GS.OS. Error=$'
|
|
|
|
|
|
; buffered out to same length.
|
|
sys str.w 'SYSTEM'
|
|
dcb.b 6,0
|
|
fsts str.w 'FSTS'
|
|
dcb. 8,0
|
|
drv str.w 'DRIVERS'
|
|
dcb.b 5,0
|
|
gsos str.w 'START.GS.OS'
|
|
dcb.b 1,0
|
|
endp
|
|
|
|
end
|