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Introduced mass-storage device enumaration - with implementation for C64 and C128.
git-svn-id: svn://svn.cc65.org/cc65/trunk@5820 b7a2c559-68d2-44c3-8de9-860c34a00d81
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ol.sc
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61
include/device.h
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61
include/device.h
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/*****************************************************************************/
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/* */
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/* device.h */
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/* */
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/* Device handling */
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/* */
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/* */
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/* */
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/* (C) 2012 Oliver Schmidt, <ol.sc@web.de> */
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/* */
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/* */
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/* This software is provided 'as-is', without any expressed or implied */
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/* warranty. In no event will the authors be held liable for any damages */
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/* arising from the use of this software. */
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/* */
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/* Permission is granted to anyone to use this software for any purpose, */
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/* including commercial applications, and to alter it and redistribute it */
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/* freely, subject to the following restrictions: */
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/* */
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/* 1. The origin of this software must not be misrepresented; you must not */
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/* claim that you wrote the original software. If you use this software */
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/* in a product, an acknowledgment in the product documentation would be */
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/* appreciated but is not required. */
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/* 2. Altered source versions must be plainly marked as such, and must not */
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/* be misrepresented as being the original software. */
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/* 3. This notice may not be removed or altered from any source */
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/* distribution. */
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/* */
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/*****************************************************************************/
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#ifndef _DEVICE_H
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#define _DEVICE_H
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/*****************************************************************************/
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/* Data */
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/*****************************************************************************/
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#define INVALID_DEVICE 255
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/*****************************************************************************/
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/* Code */
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/*****************************************************************************/
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unsigned char getfirstdevice (void);
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unsigned char __fastcall__ getnextdevice (unsigned char device);
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/* End of device.h */
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#endif
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@ -56,6 +56,7 @@ OBJS = _scrsize.o \
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devnum.o \
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fast.o \
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get_tv.o \
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getdevice.o \
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joy_stddrv.o \
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kbhit.o \
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kernal.o \
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67
libsrc/c128/getdevice.s
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67
libsrc/c128/getdevice.s
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;
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; Oliver Schmidt, 2012-09-04
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;
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; unsigned char getfirstdevice (void);
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; unsigned char __fastcall__ getnextdevice (unsigned char device);
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;
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.export _getfirstdevice
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.export _getnextdevice
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.import isdisk
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.import opencmdchannel
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.import closecmdchannel
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.importzp tmp2
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.include "c128.inc"
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;------------------------------------------------------------------------------
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; _getfirstdevice
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_getfirstdevice:
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lda #$FF
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; Fall through
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;------------------------------------------------------------------------------
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; _getnextdevice
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_getnextdevice:
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tax
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next: inx
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cpx #$FF
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beq done
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; [open|close]cmdchannel already call isdisk internally but they
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; interpret a non-disk as a no-op while we need to interpret it
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; as an error here
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jsr isdisk
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bcs next
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; [open|close]cmdchannel don't call into the Kernal at all if they
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; only [in|de]crement the reference count of the shared cmdchannel
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; so we need to explicitly initialize ST here
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lda #$00
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sta ST
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stx tmp2
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jsr opencmdchannel
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ldx tmp2
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jsr closecmdchannel
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ldx tmp2
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; As we had to reference ST above anyway we can as well do so
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; here too (instead of calling READST)
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lda ST
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; Either the Kernal calls above were successfull or there was
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; already a cmdchannel to the device open - which is a pretty
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; good indication of its existence ;-)
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bmi next
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done: txa
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ldx #$00
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rts
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@ -55,6 +55,7 @@ OBJS = _scrsize.o \
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devnum.o \
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get_ostype.o \
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get_tv.o \
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getdevice.o \
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joy_stddrv.o \
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kbhit.o \
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kernal.o \
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67
libsrc/c64/getdevice.s
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67
libsrc/c64/getdevice.s
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;
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; Oliver Schmidt, 2012-09-04
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;
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; unsigned char getfirstdevice (void);
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; unsigned char __fastcall__ getnextdevice (unsigned char device);
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;
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.export _getfirstdevice
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.export _getnextdevice
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.import isdisk
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.import opencmdchannel
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.import closecmdchannel
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.importzp tmp2
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.include "c64.inc"
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;------------------------------------------------------------------------------
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; _getfirstdevice
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_getfirstdevice:
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lda #$FF
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; Fall through
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;------------------------------------------------------------------------------
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; _getnextdevice
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_getnextdevice:
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tax
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next: inx
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cpx #$FF
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beq done
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; [open|close]cmdchannel already call isdisk internally but they
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; interpret a non-disk as a no-op while we need to interpret it
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; as an error here
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jsr isdisk
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bcs next
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; [open|close]cmdchannel don't call into the Kernal at all if they
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; only [in|de]crement the reference count of the shared cmdchannel
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; so we need to explicitly initialize ST here
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lda #$00
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sta ST
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stx tmp2
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jsr opencmdchannel
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ldx tmp2
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jsr closecmdchannel
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ldx tmp2
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; As we had to reference ST above anyway we can as well do so
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; here too (instead of calling READST)
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lda ST
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; Either the Kernal calls above were successfull or there was
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; already a cmdchannel to the device open - which is a pretty
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; good indication of its existence ;-)
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bmi next
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done: txa
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ldx #$00
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rts
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