148 lines
2.7 KiB
C
148 lines
2.7 KiB
C
/*
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* 86Box A hypervisor and IBM PC system emulator that specializes in
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* running old operating systems and software designed for IBM
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* PC systems and compatibles from 1981 through fairly recent
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* system designs based on the PCI bus.
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*
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* This file is part of the 86Box distribution.
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*
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* Implementation of the CD-ROM null interface for unmounted
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* guest CD-ROM drives.
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*
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* Version: @(#)cdrom_null.c 1.0.1 2017/06/03
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*
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* Authors: Sarah Walker, <http://pcem-emulator.co.uk/>
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* Miran Grca, <mgrca8@gmail.com>
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* Copyright 2008-2016 Sarah Walker.
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* Copyright 2016-2017 Miran Grca.
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*/
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#include "ibm.h"
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#include "cdrom.h"
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#include "cdrom_ioctl.h"
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static CDROM null_cdrom;
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static int null_ready(uint8_t id)
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{
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return 0;
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}
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/* Always return 0, the contents of a null CD-ROM drive never change. */
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static int null_medium_changed(uint8_t id)
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{
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return 0;
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}
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static uint8_t null_getcurrentsubchannel(uint8_t id, uint8_t *b, int msf)
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{
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return 0x13;
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}
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static void null_eject(uint8_t id)
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{
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}
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static void null_load(uint8_t id)
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{
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}
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static int null_readsector_raw(uint8_t id, uint8_t *buffer, int sector, int ismsf, int cdrom_sector_type, int cdrom_sector_flags, int *len)
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{
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*len = 0;
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return 0;
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}
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static int null_readtoc(uint8_t id, unsigned char *b, unsigned char starttrack, int msf, int maxlen, int single)
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{
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return 0;
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}
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static int null_readtoc_session(uint8_t id, unsigned char *b, int msf, int maxlen)
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{
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return 0;
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}
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static int null_readtoc_raw(uint8_t id, unsigned char *b, int maxlen)
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{
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return 0;
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}
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static uint32_t null_size(uint8_t id)
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{
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return 0;
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}
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static int null_status(uint8_t id)
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{
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return CD_STATUS_EMPTY;
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}
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void cdrom_null_reset(uint8_t id)
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{
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}
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void cdrom_set_null_handler(uint8_t id);
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int cdrom_null_open(uint8_t id, char d)
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{
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cdrom_set_null_handler(id);
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return 0;
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}
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void null_close(uint8_t id)
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{
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}
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static void null_exit(uint8_t id)
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{
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}
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static int null_is_track_audio(uint8_t id, uint32_t pos, int ismsf)
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{
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return 0;
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}
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static int null_pass_through(uint8_t id, uint8_t *in_cdb, uint8_t *b, uint32_t *len)
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{
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return 0;
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}
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static int null_media_type_id(uint8_t id)
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{
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return 0x70;
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}
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void cdrom_set_null_handler(uint8_t id)
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{
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cdrom_drives[id].handler = &null_cdrom;
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cdrom_drives[id].host_drive = 0;
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memset(cdrom_image[id].image_path, 0, sizeof(cdrom_image[id].image_path));
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}
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static CDROM null_cdrom =
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{
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null_ready,
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null_medium_changed,
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null_media_type_id,
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NULL,
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NULL,
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null_readtoc,
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null_readtoc_session,
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null_readtoc_raw,
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null_getcurrentsubchannel,
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null_pass_through,
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null_readsector_raw,
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NULL,
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null_load,
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null_eject,
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NULL,
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NULL,
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null_size,
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null_status,
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null_is_track_audio,
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NULL,
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null_exit
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};
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