support for loading modules in GEOS, VDC memory driver for GEOS
git-svn-id: svn://svn.cc65.org/cc65/trunk@1845 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
izydorst
parent
3e0b7b9917
commit
62907d1cc6
4 changed files with 632 additions and 4 deletions
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@ -190,7 +190,7 @@ geoslib:
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AFLAGS="-t geos -I../../../asminc" \
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CFLAGS="-Osir -g -T -t geos -I../../../include" \
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$(MAKE) -C geos || exit 1
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for i in common runtime; do \
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for i in em common runtime; do \
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CC=$(CC) \
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AS=$(AS) \
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LD=$(LD) \
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@ -206,6 +206,7 @@ geoslib:
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fi; \
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done \
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done
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cp geos/devel/*.emd .
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#-----------------------------------------------------------------------------
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# CBM PET machines
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@ -7,10 +7,27 @@
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%.o: %.s
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@$(AS) -o $@ $(AFLAGS) $<
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%.emd: %.o ../../runtime/zeropage.o
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@$(LD) -t module -o $@ $^
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S_OBJS = crt0.o oserrlist.o oserror.o randomize.o
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%.joy: %.o ../../runtime/zeropage.o
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@$(LD) -t module -o $@ $^
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all: $(S_OBJS)
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%.tgi: %.o ../../runtime/zeropage.o
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@$(LD) -t module -o $@ $^
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S_OBJS = crt0.o oserror.o oserrlist.o randomize.o fio_module.o
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#--------------------------------------------------------------------------
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# Drivers
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EMDS = geos-vdc.emd
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JOYS =
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TGIS =
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all: $(S_OBJS) $(EMDS) $(JOYS) $(TGIS)
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clean:
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@rm -f *.~ $(S_OBJS) core
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@rm -f *.~ core $(S_OBJS) $(EMDS:.emd=.o) $(JOYS:.joy=.o) $(TGIS:.tgi=.o)
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184
libsrc/geos/devel/fio_module.s
Normal file
184
libsrc/geos/devel/fio_module.s
Normal file
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@ -0,0 +1,184 @@
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;
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; Low level file I/O routines, ONLY for module loading OR sth similar
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;
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; Maciej 'YTM/Elysium' Witkowiak <ytm@elysium.pl>
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; 25.12.2002
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;
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; only ONE opened file at a time, only O_RDONLY flag
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; int open (const char* name, int flags, ...); /* May take a mode argument */
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; int __fastcall__ close (int fd);
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; int __fastcall__ read (int fd, void* buf, unsigned count);
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FILEDES = 3 ; first free to use file descriptor
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.include "../inc/geossym.inc"
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.include "../inc/const.inc"
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.include "fcntl.inc"
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.importzp ptr1, ptr2, ptr3, tmp1
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.import addysp, popax
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.import __oserror
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.import _FindFile, _ReadByte
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.export _open, _close, _read
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;--------------------------------------------------------------------------
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; _open
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_open:
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cpy #4 ; correct # of arguments (bytes)?
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beq @parmok ; parameter count ok
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tya ; parm count < 4 shouldn't be needed to be...
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sec ; ...checked (it generates a c compiler warning)
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sbc #4
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tay
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jsr addysp ; fix stack, throw away unused parameters
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; Parameters ok. Pop the flags and save them into tmp3
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@parmok:
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jsr popax ; Get flags
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sta tmp1
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jsr popax ; Get name
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sta ptr1
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stx ptr1+1
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lda filedesc ; is there a file already open?
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bne @alreadyopen
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lda tmp1 ; check open mode
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and #(O_RDWR | O_CREAT)
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cmp #O_RDONLY ; only O_RDONLY is valid
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bne @badmode
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lda ptr1
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ldx ptr1+1
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jsr _FindFile ; try to find the file
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bne @error
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lda dirEntryBuf + OFF_DE_TR_SC ; tr&se for ReadByte (r1)
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sta f_track
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lda dirEntryBuf + OFF_DE_TR_SC + 1
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sta f_sector
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lda #<diskBlkBuf ; buffer for ReadByte (r4)
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sta f_buffer
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lda #>diskBlkBuf
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sta f_buffer+1
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ldx #0 ; offset for ReadByte (r5)
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stx f_offset
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stx f_offset+1
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lda #FILEDES ; return fd
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sta filedesc
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rts
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@badmode:
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@alreadyopen:
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lda #70 ; no channel
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sta __oserror
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@error:
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lda #$ff
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tax
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rts
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_close:
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lda #0 ; clear fd
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sta filedesc
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tax
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rts
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_read:
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; a/x - number of bytes
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; popax - buffer ptr
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; popax - fd, must be == to the above one
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; return -1+__oserror or number of bytes read
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eor #$ff
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sta ptr1
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txa
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eor #$ff
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sta ptr1+1 ; -(# of bytes to read)-1
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jsr popax
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sta ptr2
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stx ptr2+1 ; buffer ptr
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jsr popax
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cmp #FILEDES
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bne @notopen
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txa
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bne @notopen ; fd must be == FILEDES
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lda #0
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sta ptr3
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sta ptr3+1 ; put 0 into ptr3 (number of bytes read)
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lda f_track ; restore stuff for ReadByte
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ldx f_sector
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sta r1L
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stx r1H
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lda f_buffer
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ldx f_buffer+1
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sta r4L
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stx r4H
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lda f_offset
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ldx f_offset+1
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sta r5L
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stx r5H
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clc
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bcc @L3 ; branch always
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@L0: jsr _ReadByte
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ldy #0 ; store the byte
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sta (ptr2),y
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inc ptr2 ; increment target address
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bne @L1
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inc ptr2+1
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@L1: inc ptr3 ; increment byte count
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bne @L2
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inc ptr3+1
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@L2: txa ; was there error ?
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beq @L3
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cmp #BFR_OVERFLOW ; EOF?
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bne @error
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beq @done
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@L3: inc ptr1 ; decrement the count
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bne @L0
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inc ptr1+1
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bne @L0
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@done:
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lda r1L ; preserve data for ReadByte
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ldx r1H
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sta f_track
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stx f_sector
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lda r4L
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ldx r4H
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sta f_buffer
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stx f_buffer+1
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lda r5L
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ldx r5H
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sta f_offset
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stx f_offset+1
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lda ptr3 ; return byte count
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ldx ptr3+1
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rts
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@notopen:
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lda #61 ; File not open
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@error:
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sta __oserror
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lda #$ff
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tax
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rts
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.bss
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filedesc: .res 1 ; file open flag - 0 (no file opened) or 1
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f_track: .res 1 ; values preserved for ReadByte
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f_sector: .res 1
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f_offset: .res 2
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f_buffer: .res 2
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426
libsrc/geos/devel/geos-vdc.s
Normal file
426
libsrc/geos/devel/geos-vdc.s
Normal file
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@ -0,0 +1,426 @@
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;
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; Extended memory driver for the VDC RAM available on all C128 machines
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; version for GEOS enters safe I/O config on C64 (transparent on C128)
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;
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; Maciej 'YTM/Elysium' Witkowiak <ytm@elysium.pl>
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; 06,20,25.12.2002
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.include "zeropage.inc"
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.include "em-kernel.inc"
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.include "em-error.inc"
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.macpack generic
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; ------------------------------------------------------------------------
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; Header. Includes jump table
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.segment "JUMPTABLE"
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; Driver signature
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.byte $65, $6d, $64 ; "emd"
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.byte $00 ; EM API version number
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; Jump table.
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.word INSTALL
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.word DEINSTALL
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.word PAGECOUNT
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.word MAP
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.word USE
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.word COMMIT
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.word COPYFROM
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.word COPYTO
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; ------------------------------------------------------------------------
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; Constants
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VDC_ADDR_REG = $D600 ; VDC address
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VDC_DATA_REG = $D601 ; VDC data
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VDC_DATA_HI = 18 ; used registers
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VDC_DATA_LO = 19
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VDC_CSET = 28
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VDC_DATA = 31
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; ------------------------------------------------------------------------
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; Data.
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.data
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pagecount: .word 64 ; $0000-$3fff as 16k default
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curpage: .word $ffff ; currently mapped-in page (invalid)
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.bss
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window: .res 256 ; memory window
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.code
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; ------------------------------------------------------------------------
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; INSTALL routine. Is called after the driver is loaded into memory. If
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; possible, check if the hardware is present and determine the amount of
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; memory available.
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; Must return an EM_ERR_xx code in a/x.
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;
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INSTALL:
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; do test for VDC presence here???
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php
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sei
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lda $01
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pha
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lda #$35
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sta $01
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ldx #VDC_CSET ; determine size of RAM...
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jsr vdcgetreg
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sta tmp1
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ora #%00010000
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jsr vdcputreg ; turn on 64k
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jsr settestadr1 ; save original value of test byte
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jsr vdcgetbyte
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sta tmp2
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lda #$55 ; write $55 here
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ldy #ptr1
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jsr test64k ; read it here and there
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lda #$aa ; write $aa here
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ldy #ptr2
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jsr test64k ; read it here and there
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jsr settestadr1
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lda tmp2
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jsr vdcputbyte ; restore original value of test byte
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lda ptr1 ; do bytes match?
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cmp ptr1+1
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bne @have64k
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lda ptr2
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cmp ptr2+1
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bne @have64k
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ldx #VDC_CSET
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lda tmp1
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jsr vdcputreg ; restore 16/64k flag
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jmp @endok ; and leave default values for 16k
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@have64k:
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lda #<256
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ldx #>256
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sta pagecount
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stx pagecount+1
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@endok:
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pla
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sta $01
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plp
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lda #<EM_ERR_OK
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ldx #>EM_ERR_OK
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rts
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test64k:
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sta tmp1
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sty ptr3
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lda #0
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sta ptr3+1
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jsr settestadr1
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lda tmp1
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jsr vdcputbyte ; write $55
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jsr settestadr1
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jsr vdcgetbyte ; read here
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pha
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jsr settestadr2
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jsr vdcgetbyte ; and there
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ldy #1
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sta (ptr3),y
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pla
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dey
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sta (ptr3),y
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rts
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settestadr1:
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ldy #$02 ; test page 2 (here)
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.byte $2c
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settestadr2:
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ldy #$42 ; or page 64+2 (there)
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lda #0
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jmp vdcsetsrcaddr
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; ------------------------------------------------------------------------
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; DEINSTALL routine. Is called before the driver is removed from memory.
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; Can do cleanup or whatever. Must not return anything.
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;
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DEINSTALL:
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;on C128 restore font and clear the screen?
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rts
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; ------------------------------------------------------------------------
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; PAGECOUNT: Return the total number of available pages in a/x.
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;
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PAGECOUNT:
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lda pagecount
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ldx pagecount+1
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rts
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; ------------------------------------------------------------------------
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; MAP: Map the page in a/x into memory and return a pointer to the page in
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; a/x. The contents of the currently mapped page (if any) may be discarded
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; by the driver.
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;
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MAP: sta curpage
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stx curpage+1
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sta ptr1+1
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ldy #0
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sty ptr1
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lda #<window
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sta ptr2
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lda #>window
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sta ptr2+1
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jsr transferin
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lda #<window
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ldx #>window
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rts
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; copy a single page from (ptr1):VDCRAM to (ptr2):RAM
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transferin:
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php
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sei
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lda $01
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pha
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lda #$35
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sta $01
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lda ptr1
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ldy ptr1+1
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jsr vdcsetsrcaddr ; set source address in VDC
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ldy #0
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ldx #VDC_DATA
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stx VDC_ADDR_REG
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@L0: bit VDC_ADDR_REG
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bpl @L0
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lda VDC_DATA_REG ; get 2 bytes at a time to speed-up
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sta (ptr2),y ; (in fact up to 8 bytes could be fetched with special VDC config)
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iny
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lda VDC_DATA_REG
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sta (ptr2),y
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iny
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bne @L0
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pla
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sta $01
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plp
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rts
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; ------------------------------------------------------------------------
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; USE: Tell the driver that the window is now associated with a given page.
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USE: sta curpage
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stx curpage+1 ; Remember the page
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lda #<window
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ldx #>window ; Return the window
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done: rts
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; ------------------------------------------------------------------------
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; COMMIT: Commit changes in the memory window to extended storage.
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COMMIT:
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lda curpage ; jump if no page mapped
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ldx curpage+1
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bmi done
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sta ptr1+1
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ldy #0
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sty ptr1
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lda #<window
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sta ptr2
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lda #>window
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sta ptr2+1
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; fall through to transferout
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; copy a single page from (ptr2):RAM to (ptr1):VDCRAM
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transferout:
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php
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sei
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lda $01
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pha
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lda #$35
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sta $01
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lda ptr1
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ldy ptr1+1
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jsr vdcsetsrcaddr ; set source address in VDC
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ldy #0
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ldx #VDC_DATA
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stx VDC_ADDR_REG
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@L0: bit VDC_ADDR_REG
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bpl @L0
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lda (ptr2),y ; speedup does not work for writing
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sta VDC_DATA_REG
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iny
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bne @L0
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pla
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sta $01
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plp
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rts
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; ------------------------------------------------------------------------
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; COPYFROM: Copy from extended into linear memory. A pointer to a structure
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; describing the request is passed in a/x.
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; The function must not return anything.
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;
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COPYFROM:
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jsr setup
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beq @L2 ; Skip if no full pages
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; Copy full pages
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@L1: jsr transferin
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inc ptr1+1
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inc ptr2+1
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dec tmp1
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bne @L1
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; Copy the remainder of the page
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@L2: ldy #EM_COPY_COUNT
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lda (ptr3),y ; Get bytes in last page
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beq @L4
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sta tmp1
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; Transfer the bytes in the last page
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php
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sei
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lda $01
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pha
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lda #$35
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sta $01
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ldy #0
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@L3: jsr vdcgetbyte
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sta (ptr2),y
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iny
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dec tmp1
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lda tmp1
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bne @L3
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pla
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sta $01
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plp
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@L4: rts
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; ------------------------------------------------------------------------
|
||||
; COPYTO: Copy from linear into extended memory. A pointer to a structure
|
||||
; describing the request is passed in a/x.
|
||||
; The function must not return anything.
|
||||
;
|
||||
|
||||
COPYTO:
|
||||
jsr setup
|
||||
beq @L2 ; Skip if no full pages
|
||||
|
||||
; Copy full pages
|
||||
|
||||
@L1: jsr transferout
|
||||
inc ptr1+1
|
||||
inc ptr2+1
|
||||
dec tmp1
|
||||
bne @L1
|
||||
|
||||
; Copy the remainder of the page
|
||||
|
||||
@L2: ldy #EM_COPY_COUNT
|
||||
lda (ptr3),y ; Get bytes in last page
|
||||
beq @L4
|
||||
sta tmp1
|
||||
|
||||
; Transfer the bytes in the last page
|
||||
php
|
||||
sei
|
||||
lda $01
|
||||
pha
|
||||
lda #$35
|
||||
sta $01
|
||||
ldy #0
|
||||
@L3: lda (ptr2),y
|
||||
jsr vdcputbyte
|
||||
iny
|
||||
dec tmp1
|
||||
lda tmp1
|
||||
bne @L3
|
||||
pla
|
||||
sta $01
|
||||
plp
|
||||
@L4: rts
|
||||
|
||||
;-------------------------------------------------------------------------
|
||||
; Helper functions to handle VDC ram
|
||||
;
|
||||
|
||||
vdcsetsrcaddr:
|
||||
ldx #VDC_DATA_LO
|
||||
stx VDC_ADDR_REG
|
||||
@L0: bit VDC_ADDR_REG
|
||||
bpl @L0
|
||||
sta VDC_DATA_REG
|
||||
dex
|
||||
tya
|
||||
stx VDC_ADDR_REG
|
||||
sta VDC_DATA_REG
|
||||
rts
|
||||
|
||||
vdcgetbyte:
|
||||
ldx #VDC_DATA
|
||||
vdcgetreg:
|
||||
stx VDC_ADDR_REG
|
||||
@L0: bit VDC_ADDR_REG
|
||||
bpl @L0
|
||||
lda VDC_DATA_REG
|
||||
rts
|
||||
|
||||
vdcputbyte:
|
||||
ldx #VDC_DATA
|
||||
vdcputreg:
|
||||
stx VDC_ADDR_REG
|
||||
@L0: bit VDC_ADDR_REG
|
||||
bpl @L0
|
||||
sta VDC_DATA_REG
|
||||
rts
|
||||
|
||||
; ------------------------------------------------------------------------
|
||||
; Helper function for COPYFROM and COPYTO: Store the pointer to the request
|
||||
; structure and prepare data for the copy
|
||||
;
|
||||
|
||||
setup:
|
||||
sta ptr3
|
||||
stx ptr3+1 ; Save the passed em_copy pointer
|
||||
|
||||
ldy #EM_COPY_OFFS
|
||||
lda (ptr3),y
|
||||
sta ptr1
|
||||
ldy #EM_COPY_PAGE
|
||||
lda (ptr3),y
|
||||
sta ptr1+1 ; From
|
||||
|
||||
ldy #EM_COPY_BUF
|
||||
lda (ptr3),y
|
||||
sta ptr2
|
||||
iny
|
||||
lda (ptr3),y
|
||||
sta ptr2+1 ; To
|
||||
|
||||
ldy #EM_COPY_COUNT+1
|
||||
lda (ptr3),y ; Get number of pages
|
||||
sta tmp1
|
||||
rts
|
||||
|
||||
Loading…
Add table
Reference in a new issue