mirror of https://github.com/bochs-emu/Bochs
138 lines
4.6 KiB
C++
138 lines
4.6 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: floppy.h,v 1.8 2001-12-28 16:36:45 vruppert Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2001 MandrakeSoft S.A.
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//
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// MandrakeSoft S.A.
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// 43, rue d'Aboukir
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// 75002 Paris - France
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// http://www.linux-mandrake.com/
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// http://www.mandrakesoft.com/
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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#define FROM_FLOPPY 10
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#define TO_FLOPPY 11
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#if BX_USE_FD_SMF
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# define BX_FD_SMF static
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# define BX_FD_THIS bx_floppy.
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#else
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# define BX_FD_SMF
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# define BX_FD_THIS this->
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#endif
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typedef struct {
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int fd; /* file descriptor of floppy image file */
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unsigned sectors_per_track; /* number of sectors/track */
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unsigned sectors; /* number of formatted sectors on diskette */
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unsigned tracks; /* number of tracks */
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unsigned heads; /* number of heads */
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unsigned type;
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unsigned write_protected;
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} floppy_t;
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class bx_floppy_ctrl_c : public logfunctions {
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public:
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bx_floppy_ctrl_c(void);
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~bx_floppy_ctrl_c(void);
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BX_FD_SMF void init(bx_devices_c *d, bx_cmos_c *cmos);
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BX_FD_SMF void reset(unsigned source);
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BX_FD_SMF void dma_write(Bit8u *data_byte);
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BX_FD_SMF void dma_read(Bit8u *data_byte);
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BX_FD_SMF unsigned set_media_status(unsigned drive, unsigned status);
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BX_FD_SMF unsigned get_media_status(unsigned drive);
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private:
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struct {
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Bit8u data_rate;
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Bit8u command[10]; /* largest command size ??? */
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Bit8u command_index;
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Bit8u command_size;
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Boolean command_complete;
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Bit8u pending_command;
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Boolean multi_track;
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Boolean pending_irq;
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Bit8u format_count;
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Bit8u format_fillbyte;
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Bit8u result[10];
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Bit8u result_index;
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Bit8u result_size;
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Bit8u DOR; // Digital Ouput Register
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Bit8u TDR; // Tape Drive Register
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Bit8u cylinder[4]; // really only using 2 drives
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Bit8u head[4]; // really only using 2 drives
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Bit8u sector[4]; // really only using 2 drives
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/* MAIN STATUS REGISTER
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* b7: MRQ: main request 1=data register ready 0=data register not ready
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* b6: DIO: data input/output:
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* 1=controller->CPU (ready for data read)
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* 0=CPU->controller (ready for data write)
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* b5: NDMA: non-DMA mode: 1=controller not in DMA modes
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* 0=controller in DMA mode
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* b4: BUSY: instruction(device busy) 1=active 0=not active
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* b3-0: ACTD, ACTC, ACTB, ACTA:
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* drive D,C,B,A in positioning mode 1=active 0=not active
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*/
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Bit8u main_status_reg;
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Bit8u status_reg0;
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Bit8u status_reg1;
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Bit8u status_reg2;
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Bit8u status_reg3;
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// drive field allows up to 4 drives, even though probably only 2 will
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// ever be used.
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floppy_t media[4];
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unsigned num_supported_floppies;
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Bit8u floppy_buffer[512+2]; // 2 extra for good measure
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unsigned floppy_buffer_index;
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int floppy_timer_index;
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Boolean media_present[2];
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Bit8u DIR; // Digital Input Register:
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// b7: 0=diskette is present and has not been changed
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// 1=diskette missing or changed
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} s; // state information
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bx_devices_c *devices;
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static Bit32u read_handler(void *this_ptr, Bit32u address, unsigned io_len);
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static void write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len);
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#if !BX_USE_FD_SMF
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Bit32u read(Bit32u address, unsigned io_len);
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void write(Bit32u address, Bit32u value, unsigned io_len);
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#endif
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BX_FD_SMF void floppy_command(void);
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BX_FD_SMF void floppy_xfer(Bit8u drive, Bit32u offset, Bit8u *buffer, Bit32u bytes, Bit8u direction);
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static void timer_handler(void *);
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public:
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BX_FD_SMF void timer(void);
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BX_FD_SMF void increment_sector(void);
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BX_FD_SMF Boolean evaluate_media(unsigned type, char *path, floppy_t *floppy);
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};
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extern bx_floppy_ctrl_c bx_floppy;
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