1622 lines
53 KiB
C++
1622 lines
53 KiB
C++
/////////////////////////////////////////////////////////////////////////
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// $Id: floppy.cc,v 1.63 2003-07-31 19:51:42 vruppert Exp $
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/////////////////////////////////////////////////////////////////////////
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//
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// Copyright (C) 2002 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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//
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//
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// Floppy Disk Controller Docs:
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// Intel 82077A Data sheet
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// ftp://void-core.2y.net/pub/docs/fdc/82077AA_FloppyControllerDatasheet.pdf
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// Intel 82078 Data sheet
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// ftp://download.intel.com/design/periphrl/datashts/29047403.PDF
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// Other FDC references
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// http://debs.future.easyspace.com/Programming/Hardware/FDC/floppy.html
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// And a port list:
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// http://mudlist.eorbit.net/~adam/pickey/ports.html
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//
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// Define BX_PLUGGABLE in files that can be compiled into plugins. For
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// platforms that require a special tag on exported symbols, BX_PLUGGABLE
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// is used to know when we are exporting symbols and when we are importing.
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#define BX_PLUGGABLE
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extern "C" {
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#include <errno.h>
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}
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#include "bochs.h"
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// windows.h included by bochs.h
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#define LOG_THIS theFloppyController->
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bx_floppy_ctrl_c *theFloppyController;
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/* for main status register */
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#define FD_MS_MRQ 0x80
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#define FD_MS_DIO 0x40
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#define FD_MS_NDMA 0x20
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#define FD_MS_BUSY 0x10
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#define FD_MS_ACTD 0x08
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#define FD_MS_ACTC 0x04
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#define FD_MS_ACTB 0x02
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#define FD_MS_ACTA 0x01
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#define FROM_FLOPPY 10
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#define TO_FLOPPY 11
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#define FLOPPY_DMA_CHAN 2
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int
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libfloppy_LTX_plugin_init(plugin_t *plugin, plugintype_t type, int argc, char *argv[])
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{
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theFloppyController = new bx_floppy_ctrl_c ();
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bx_devices.pluginFloppyDevice = theFloppyController;
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BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theFloppyController, BX_PLUGIN_FLOPPY);
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return(0); // Success
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}
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void
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libfloppy_LTX_plugin_fini(void)
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{
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}
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bx_floppy_ctrl_c::bx_floppy_ctrl_c(void)
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{
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put("FDD");
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settype(FDLOG);
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s.floppy_timer_index = BX_NULL_TIMER_HANDLE;
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}
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bx_floppy_ctrl_c::~bx_floppy_ctrl_c(void)
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{
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// nothing for now
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BX_DEBUG(("Exit."));
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}
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void
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bx_floppy_ctrl_c::init(void)
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{
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Bit8u i;
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BX_DEBUG(("Init $Id: floppy.cc,v 1.63 2003-07-31 19:51:42 vruppert Exp $"));
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DEV_dma_register_8bit_channel(2, dma_read, dma_write, "Floppy Drive");
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DEV_register_irq(6, "Floppy Drive");
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for (unsigned addr=0x03F2; addr<=0x03F7; addr++) {
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DEV_register_ioread_handler(this, read_handler, addr, "Floppy Drive", 1);
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DEV_register_iowrite_handler(this, write_handler, addr, "Floppy Drive", 1);
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}
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DEV_cmos_set_reg(0x10, 0x00); /* start out with: no drive 0, no drive 1 */
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BX_FD_THIS s.num_supported_floppies = 0;
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for (i=0; i<4; i++) {
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BX_FD_THIS s.device_type[i] = BX_FLOPPY_NONE;
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BX_FD_THIS s.media[i].type = BX_FLOPPY_NONE;
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}
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//
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// Floppy A setup
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//
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BX_FD_THIS s.media[0].sectors_per_track = 0;
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BX_FD_THIS s.media[0].tracks = 0;
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BX_FD_THIS s.media[0].heads = 0;
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BX_FD_THIS s.media[0].sectors = 0;
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BX_FD_THIS s.media[0].fd = -1;
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BX_FD_THIS s.media_present[0] = 0;
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BX_FD_THIS s.device_type[0] = bx_options.floppya.Odevtype->get ();
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switch (BX_FD_THIS s.device_type[0]) {
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case BX_FLOPPY_NONE:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x00);
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break;
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case BX_FLOPPY_360K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x10);
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break;
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case BX_FLOPPY_1_2:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x20);
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break;
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case BX_FLOPPY_720K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x30);
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break;
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case BX_FLOPPY_1_44:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x40);
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break;
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case BX_FLOPPY_2_88:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x50);
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break;
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// use CMOS reserved types
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case BX_FLOPPY_160K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x60);
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BX_INFO(("WARNING: 1st floppy uses of reserved CMOS floppy drive type 6"));
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break;
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case BX_FLOPPY_180K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x70);
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BX_INFO(("WARNING: 1st floppy uses of reserved CMOS floppy drive type 7"));
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break;
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case BX_FLOPPY_320K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x80);
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BX_INFO(("WARNING: 1st floppy uses of reserved CMOS floppy drive type 8"));
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break;
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default:
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BX_PANIC(("unknown floppya type"));
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}
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if (BX_FD_THIS s.device_type[0] != BX_FLOPPY_NONE)
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BX_FD_THIS s.num_supported_floppies++;
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if (bx_options.floppya.Otype->get () != BX_FLOPPY_NONE) {
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if ( bx_options.floppya.Ostatus->get () == BX_INSERTED) {
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if (evaluate_media(bx_options.floppya.Otype->get (), bx_options.floppya.Opath->getptr (),
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& BX_FD_THIS s.media[0]))
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BX_FD_THIS s.media_present[0] = 1;
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else
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bx_options.floppya.Ostatus->set(BX_EJECTED);
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#define MED (BX_FD_THIS s.media[0])
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BX_INFO(("fd0: '%s' ro=%d, h=%d,t=%d,spt=%d", bx_options.floppya.Opath->getptr(),
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MED.write_protected, MED.heads, MED.tracks, MED.sectors_per_track));
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#undef MED
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}
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}
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//
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// Floppy B setup
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//
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BX_FD_THIS s.media[1].sectors_per_track = 0;
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BX_FD_THIS s.media[1].tracks = 0;
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BX_FD_THIS s.media[1].heads = 0;
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BX_FD_THIS s.media[1].sectors = 0;
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BX_FD_THIS s.media[1].fd = -1;
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BX_FD_THIS s.media_present[1] = 0;
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BX_FD_THIS s.device_type[1] = bx_options.floppyb.Odevtype->get ();
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switch (BX_FD_THIS s.device_type[1]) {
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case BX_FLOPPY_NONE:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x00);
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break;
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case BX_FLOPPY_360K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x01);
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break;
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case BX_FLOPPY_1_2:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x02);
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break;
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case BX_FLOPPY_720K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x03);
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break;
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case BX_FLOPPY_1_44:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x04);
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break;
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case BX_FLOPPY_2_88:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x05);
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break;
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// use CMOS reserved types
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case BX_FLOPPY_160K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x06);
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BX_INFO(("WARNING: 2nd floppy uses of reserved CMOS floppy drive type 6"));
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break;
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case BX_FLOPPY_180K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x07);
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BX_INFO(("WARNING: 2nd floppy uses of reserved CMOS floppy drive type 7"));
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break;
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case BX_FLOPPY_320K:
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DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x08);
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BX_INFO(("WARNING: 2nd floppy uses of reserved CMOS floppy drive type 8"));
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break;
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default:
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BX_PANIC(("unknown floppyb type"));
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}
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if (BX_FD_THIS s.device_type[1] != BX_FLOPPY_NONE)
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BX_FD_THIS s.num_supported_floppies++;
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if (bx_options.floppyb.Otype->get () != BX_FLOPPY_NONE) {
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if ( bx_options.floppyb.Ostatus->get () == BX_INSERTED) {
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if (evaluate_media(bx_options.floppyb.Otype->get (), bx_options.floppyb.Opath->getptr (),
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& BX_FD_THIS s.media[1]))
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BX_FD_THIS s.media_present[1] = 1;
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else
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bx_options.floppyb.Ostatus->set(BX_EJECTED);
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#define MED (BX_FD_THIS s.media[1])
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BX_INFO(("fd1: '%s' ro=%d, h=%d,t=%d,spt=%d", bx_options.floppyb.Opath->getptr(),
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MED.write_protected, MED.heads, MED.tracks, MED.sectors_per_track));
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#undef MED
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}
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}
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/* CMOS Equipment Byte register */
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if (BX_FD_THIS s.num_supported_floppies > 0) {
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DEV_cmos_set_reg(0x14, (DEV_cmos_get_reg(0x14) & 0x3e) |
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((BX_FD_THIS s.num_supported_floppies-1) << 6) | 1);
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}
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else
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DEV_cmos_set_reg(0x14, (DEV_cmos_get_reg(0x14) & 0x3e));
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if (BX_FD_THIS s.floppy_timer_index == BX_NULL_TIMER_HANDLE) {
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BX_FD_THIS s.floppy_timer_index =
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bx_pc_system.register_timer( this, timer_handler,
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bx_options.Ofloppy_command_delay->get (), 0,0, "floppy");
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}
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BX_DEBUG(("bx_options.Ofloppy_command_delay = %u",
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(unsigned) bx_options.Ofloppy_command_delay->get ()));
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}
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void
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bx_floppy_ctrl_c::reset(unsigned type)
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{
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Bit32u i;
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BX_FD_THIS s.pending_irq = 0;
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BX_FD_THIS s.reset_sensei = 0; /* no reset result present */
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BX_FD_THIS s.main_status_reg = 0;
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BX_FD_THIS s.status_reg0 = 0;
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BX_FD_THIS s.status_reg1 = 0;
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BX_FD_THIS s.status_reg2 = 0;
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BX_FD_THIS s.status_reg3 = 0;
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// software reset (via DOR port 0x3f2 bit 2) does not change DOR
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if (type == BX_RESET_HARDWARE) {
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BX_FD_THIS s.DOR = 0x0c;
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// motor off, drive 3..0
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// DMA/INT enabled
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// normal operation
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// drive select 0
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// DIR and CCR affected only by hard reset
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for (i=0; i<4; i++) {
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BX_FD_THIS s.DIR[i] |= 0x80; // disk changed
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}
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BX_FD_THIS s.data_rate = 0; /* 500 Kbps */
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}
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for (i=0; i<4; i++) {
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BX_FD_THIS s.cylinder[i] = 0;
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BX_FD_THIS s.head[i] = 0;
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BX_FD_THIS s.sector[i] = 0;
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}
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DEV_pic_lower_irq(6);
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DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0);
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enter_idle_phase();
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}
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// static IO port read callback handler
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// redirects to non-static class handler to avoid virtual functions
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Bit32u
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bx_floppy_ctrl_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len)
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{
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#if !BX_USE_FD_SMF
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bx_floppy_ctrl_c *class_ptr = (bx_floppy_ctrl_c *) this_ptr;
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return( class_ptr->read(address, io_len) );
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}
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/* reads from the floppy io ports */
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Bit32u
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bx_floppy_ctrl_c::read(Bit32u address, unsigned io_len)
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{
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#else
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UNUSED(this_ptr);
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#endif // !BX_USE_FD_SMF
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Bit8u status, value;
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if (bx_dbg.floppy)
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BX_INFO(("read access to port %04x", (unsigned) address));
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switch (address) {
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#if BX_DMA_FLOPPY_IO
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case 0x3F2: // diskette controller digital output register
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value = BX_FD_THIS s.DOR;
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return(value);
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break;
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case 0x3F4: /* diskette controller main status register */
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status = BX_FD_THIS s.main_status_reg;
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return(status);
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break;
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case 0x3F5: /* diskette controller data */
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if (BX_FD_THIS s.result_size == 0) {
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BX_ERROR(("port 0x3f5: no results to read"));
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BX_FD_THIS s.main_status_reg = 0;
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return BX_FD_THIS s.result[0];
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}
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value = BX_FD_THIS s.result[BX_FD_THIS s.result_index++];
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BX_FD_THIS s.main_status_reg &= 0xF0;
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if (BX_FD_THIS s.result_index >= BX_FD_THIS s.result_size) {
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if (!BX_FD_THIS s.reset_sensei) BX_FD_THIS s.pending_irq = 0;
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DEV_pic_lower_irq(6);
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enter_idle_phase();
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}
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return(value);
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break;
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#endif // #if BX_DMA_FLOPPY_IO
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case 0x3F3: // Tape Drive Register
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// see http://www.smsc.com/main/datasheets/37c93x.pdf page 18 for more details
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switch( BX_FD_THIS s.DOR & 0x03 )
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{
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case 0x00:
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if( (BX_FD_THIS s.DOR & 0x10) == 0) break;
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return(2);
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case 0x01:
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if( (BX_FD_THIS s.DOR & 0x20) == 0) break;
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return(1);
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}
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return(3);
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case 0x3F6: // Reserved for future floppy controllers
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// This address shared with the hard drive controller
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value = DEV_hd_read_handler(bx_devices.pluginHardDrive, address, io_len);
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return( value );
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break;
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case 0x3F7: // diskette controller digital input register
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// This address shared with the hard drive controller:
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// Bit 7 : floppy
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// Bits 6..0: hard drive
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value = DEV_hd_read_handler(bx_devices.pluginHardDrive, address, io_len);
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value &= 0x7f;
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// add in diskette change line
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value |= (BX_FD_THIS s.DIR[BX_FD_THIS s.DOR & 0x03] & 0x80);
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return( value );
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break;
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default:
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BX_ERROR(("io_read: unsupported address 0x%04x", (unsigned) address));
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return(0);
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break;
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}
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}
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// static IO port write callback handler
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// redirects to non-static class handler to avoid virtual functions
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void
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bx_floppy_ctrl_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len)
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{
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#if !BX_USE_FD_SMF
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bx_floppy_ctrl_c *class_ptr = (bx_floppy_ctrl_c *) this_ptr;
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class_ptr->write(address, value, io_len);
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}
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/* writes to the floppy io ports */
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void
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bx_floppy_ctrl_c::write(Bit32u address, Bit32u value, unsigned io_len)
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{
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#else
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UNUSED(this_ptr);
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#endif // !BX_USE_FD_SMF
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Bit8u dma_and_interrupt_enable;
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Bit8u normal_operation, prev_normal_operation;
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Bit8u drive_select;
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Bit8u motor_on_drive0, motor_on_drive1;
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if (bx_dbg.floppy)
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BX_INFO(("write access to port %04x, value=%02x",
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(unsigned) address, (unsigned) value));
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switch (address) {
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#if BX_DMA_FLOPPY_IO
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case 0x3F2: /* diskette controller digital output register */
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motor_on_drive1 = value & 0x20;
|
|
motor_on_drive0 = value & 0x10;
|
|
dma_and_interrupt_enable = value & 0x08;
|
|
if (!dma_and_interrupt_enable)
|
|
BX_DEBUG(("DMA and interrupt capabilities disabled"));
|
|
normal_operation = value & 0x04;
|
|
drive_select = value & 0x03;
|
|
|
|
prev_normal_operation = BX_FD_THIS s.DOR & 0x04;
|
|
BX_FD_THIS s.DOR = value;
|
|
|
|
if (prev_normal_operation==0 && normal_operation) {
|
|
// transition from RESET to NORMAL
|
|
bx_pc_system.activate_timer( BX_FD_THIS s.floppy_timer_index,
|
|
bx_options.Ofloppy_command_delay->get (), 0 );
|
|
}
|
|
else if (prev_normal_operation && normal_operation==0) {
|
|
// transition from NORMAL to RESET
|
|
BX_FD_THIS s.main_status_reg = FD_MS_BUSY;
|
|
BX_FD_THIS s.pending_command = 0xfe; // RESET pending
|
|
|
|
}
|
|
BX_DEBUG(("io_write: digital output register"));
|
|
BX_DEBUG((" motor on, drive1 = %d", motor_on_drive1 > 0));
|
|
BX_DEBUG((" motor on, drive0 = %d", motor_on_drive0 > 0));
|
|
BX_DEBUG((" dma_and_interrupt_enable=%02x",
|
|
(unsigned) dma_and_interrupt_enable));
|
|
BX_DEBUG((" normal_operation=%02x",
|
|
(unsigned) normal_operation));
|
|
BX_DEBUG((" drive_select=%02x",
|
|
(unsigned) drive_select));
|
|
if (BX_FD_THIS s.device_type[drive_select] == BX_FLOPPY_NONE) {
|
|
BX_DEBUG(("WARNING: not existing drive selected"));
|
|
}
|
|
break;
|
|
|
|
case 0x3f4: /* diskette controller data rate select register */
|
|
BX_ERROR(("io_write: data rate select register unsupported"));
|
|
break;
|
|
|
|
case 0x3F5: /* diskette controller data */
|
|
BX_DEBUG(("command = %02x", (unsigned) value));
|
|
if (BX_FD_THIS s.command_complete) {
|
|
if (BX_FD_THIS s.pending_command!=0)
|
|
BX_PANIC(("io: 3f5: receiving new comm, old one (%02x) pending",
|
|
(unsigned) BX_FD_THIS s.pending_command));
|
|
BX_FD_THIS s.command[0] = value;
|
|
BX_FD_THIS s.command_complete = 0;
|
|
BX_FD_THIS s.command_index = 1;
|
|
/* read/write command in progress */
|
|
BX_FD_THIS s.main_status_reg = FD_MS_MRQ | FD_MS_BUSY;
|
|
switch (value) {
|
|
case 0x03: /* specify */
|
|
BX_FD_THIS s.command_size = 3;
|
|
break;
|
|
case 0x04: // get status
|
|
BX_FD_THIS s.command_size = 2;
|
|
break;
|
|
case 0x07: /* recalibrate */
|
|
BX_FD_THIS s.command_size = 2;
|
|
break;
|
|
case 0x08: /* sense interrupt status */
|
|
BX_FD_THIS s.command_size = 1;
|
|
break;
|
|
case 0x0f: /* seek */
|
|
BX_FD_THIS s.command_size = 3;
|
|
break;
|
|
case 0x4a: /* read ID */
|
|
BX_FD_THIS s.command_size = 2;
|
|
break;
|
|
case 0x4d: /* format track */
|
|
BX_FD_THIS s.command_size = 6;
|
|
break;
|
|
case 0x45:
|
|
case 0xc5: /* write normal data */
|
|
BX_FD_THIS s.command_size = 9;
|
|
break;
|
|
case 0x46:
|
|
case 0x66:
|
|
case 0xc6:
|
|
case 0xe6: /* read normal data */
|
|
BX_FD_THIS s.command_size = 9;
|
|
break;
|
|
|
|
case 0x13: // Configure command (Enhanced)
|
|
BX_FD_THIS s.command_size = 4;
|
|
break;
|
|
|
|
case 0x0e: // dump registers (Enhanced drives)
|
|
case 0x10: // Version command, standard controller returns 80h
|
|
case 0x18: // National Semiconductor version command; return 80h
|
|
// These commands are not implemented on the standard
|
|
// controller and return an error. They are available on
|
|
// the enhanced controller.
|
|
BX_DEBUG(("io_write: 0x3f5: unsupported floppy command 0x%02x",
|
|
(unsigned) value));
|
|
BX_FD_THIS s.command_size = 0; // make sure we don't try to process this command
|
|
BX_FD_THIS s.status_reg0 = 0x80; // status: invalid command
|
|
enter_result_phase();
|
|
break;
|
|
|
|
default:
|
|
BX_ERROR(("io_write: 0x3f5: invalid floppy command 0x%02x",
|
|
(unsigned) value));
|
|
BX_FD_THIS s.command_size = 0; // make sure we don't try to process this command
|
|
BX_FD_THIS s.status_reg0 = 0x80; // status: invalid command
|
|
enter_result_phase();
|
|
break;
|
|
}
|
|
}
|
|
else {
|
|
BX_FD_THIS s.command[BX_FD_THIS s.command_index++] =
|
|
value;
|
|
}
|
|
if (BX_FD_THIS s.command_index ==
|
|
BX_FD_THIS s.command_size) {
|
|
/* read/write command not in progress any more */
|
|
floppy_command();
|
|
BX_FD_THIS s.command_complete = 1;
|
|
}
|
|
BX_DEBUG(("io_write: diskette controller data"));
|
|
return;
|
|
break;
|
|
#endif // #if BX_DMA_FLOPPY_IO
|
|
|
|
case 0x3F6: /* diskette controller (reserved) */
|
|
BX_DEBUG(("io_write: reserved register 0x3f6 unsupported"));
|
|
// this address shared with the hard drive controller
|
|
DEV_hd_write_handler(bx_devices.pluginHardDrive, address, value, io_len);
|
|
break;
|
|
|
|
#if BX_DMA_FLOPPY_IO
|
|
case 0x3F7: /* diskette controller configuration control register */
|
|
BX_DEBUG(("io_write: config control register"));
|
|
BX_FD_THIS s.data_rate = value & 0x03;
|
|
switch (BX_FD_THIS s.data_rate) {
|
|
case 0: BX_DEBUG((" 500 Kbps")); break;
|
|
case 1: BX_DEBUG((" 300 Kbps")); break;
|
|
case 2: BX_DEBUG((" 250 Kbps")); break;
|
|
case 3: BX_DEBUG((" 1 Mbps")); break;
|
|
}
|
|
return;
|
|
break;
|
|
|
|
default:
|
|
BX_ERROR(("io_write ignored: 0x%04x = 0x%02x", (unsigned) address, (unsigned) value));
|
|
break;
|
|
#endif // #if BX_DMA_FLOPPY_IO
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void
|
|
bx_floppy_ctrl_c::floppy_command(void)
|
|
{
|
|
#if BX_PROVIDE_CPU_MEMORY==0
|
|
BX_PANIC(("floppy_command(): uses DMA: not supported for"
|
|
" external environment"));
|
|
#else
|
|
unsigned i;
|
|
Bit8u step_rate_time;
|
|
Bit8u head_unload_time;
|
|
Bit8u head_load_time;
|
|
Bit8u motor_on;
|
|
Bit8u head, drive, cylinder, sector, eot;
|
|
Bit8u sector_size, data_length;
|
|
Bit32u logical_sector;
|
|
|
|
|
|
BX_DEBUG(("FLOPPY COMMAND: "));
|
|
for (i=0; i<BX_FD_THIS s.command_size; i++)
|
|
BX_DEBUG(("[%02x] ", (unsigned) BX_FD_THIS s.command[i]));
|
|
|
|
#if 0
|
|
/* execute phase of command is in progress (non DMA mode) */
|
|
BX_FD_THIS s.main_status_reg |= 20;
|
|
#endif
|
|
|
|
BX_FD_THIS s.pending_command = BX_FD_THIS s.command[0];
|
|
switch (BX_FD_THIS s.pending_command) {
|
|
case 0x03: // specify
|
|
// execution: specified parameters are loaded
|
|
// result: no result bytes, no interrupt
|
|
step_rate_time = BX_FD_THIS s.command[1] >> 4;
|
|
head_unload_time = BX_FD_THIS s.command[1] & 0x0f;
|
|
head_load_time = BX_FD_THIS s.command[2] >> 1;
|
|
if (BX_FD_THIS s.command[2] & 0x01)
|
|
BX_ERROR(("non DMA mode selected"));
|
|
enter_idle_phase();
|
|
return;
|
|
break;
|
|
|
|
case 0x04: // get status
|
|
drive = (BX_FD_THIS s.command[1] & 0x03);
|
|
BX_FD_THIS s.head[drive] = (BX_FD_THIS s.command[1] >> 2) & 0x01;
|
|
BX_FD_THIS s.status_reg3 = 0x28 | (BX_FD_THIS s.head[drive]<<2) | drive
|
|
| (BX_FD_THIS s.media[drive].write_protected ? 0x40 : 0x00);
|
|
if (BX_FD_THIS s.cylinder[drive] == 0) BX_FD_THIS s.status_reg3 |= 0x10;
|
|
enter_result_phase();
|
|
return;
|
|
break;
|
|
|
|
case 0x07: // recalibrate
|
|
drive = (BX_FD_THIS s.command[1] & 0x03);
|
|
BX_FD_THIS s.DOR &= 0xfc;
|
|
BX_FD_THIS s.DOR |= drive;
|
|
BX_DEBUG(("floppy_command(): recalibrate drive %u",
|
|
(unsigned) drive));
|
|
motor_on = ( (BX_FD_THIS s.DOR>>(drive+4))
|
|
& 0x01 );
|
|
if (motor_on == 0) {
|
|
BX_INFO(("floppy_command(): recal drive with motor off"));
|
|
}
|
|
if (drive==0)
|
|
BX_FD_THIS s.DOR |= 0x10; // turn on MOTA
|
|
else
|
|
BX_FD_THIS s.DOR |= 0x20; // turn on MOTB
|
|
bx_pc_system.activate_timer( BX_FD_THIS s.floppy_timer_index,
|
|
bx_options.Ofloppy_command_delay->get (), 0 );
|
|
/* command head to track 0
|
|
* controller set to non-busy
|
|
* error condition noted in Status reg 0's equipment check bit
|
|
* seek end bit set to 1 in Status reg 0 regardless of outcome
|
|
* The last two are taken care of in timer().
|
|
*/
|
|
BX_FD_THIS s.cylinder[drive] = 0;
|
|
BX_FD_THIS s.main_status_reg = (1 << drive);
|
|
return;
|
|
break;
|
|
|
|
case 0x08: /* sense interrupt status */
|
|
/* execution:
|
|
* get status
|
|
* result:
|
|
* no interupt
|
|
* byte0 = status reg0
|
|
* byte1 = current cylinder number (0 to 79)
|
|
*/
|
|
drive = BX_FD_THIS s.DOR & 0x03;
|
|
if (!BX_FD_THIS s.pending_irq) {
|
|
BX_FD_THIS s.status_reg0 = 0x80;
|
|
}
|
|
else {
|
|
if (BX_FD_THIS s.reset_sensei > 0) {
|
|
drive = 4 - BX_FD_THIS s.reset_sensei;
|
|
BX_FD_THIS s.status_reg0 &= 0xf8;
|
|
BX_FD_THIS s.status_reg0 |= (BX_FD_THIS s.head[drive] << 2) | drive;
|
|
BX_FD_THIS s.reset_sensei--;
|
|
}
|
|
}
|
|
|
|
BX_DEBUG(("sense interrupt status"));
|
|
enter_result_phase();
|
|
return;
|
|
break;
|
|
|
|
case 0x0f: /* seek */
|
|
/* command:
|
|
* byte0 = 0F
|
|
* byte1 = drive & head select
|
|
* byte2 = cylinder number
|
|
* execution:
|
|
* postion head over specified cylinder
|
|
* result:
|
|
* no result bytes, issues an interrupt
|
|
*/
|
|
drive = BX_FD_THIS s.command[1] & 0x03;
|
|
BX_FD_THIS s.DOR &= 0xfc;
|
|
BX_FD_THIS s.DOR |= drive;
|
|
|
|
BX_FD_THIS s.head[drive] = (BX_FD_THIS s.command[1] >> 2) & 0x01;
|
|
BX_FD_THIS s.cylinder[drive] = BX_FD_THIS s.command[2];
|
|
/* ??? should also check cylinder validity */
|
|
bx_pc_system.activate_timer( BX_FD_THIS s.floppy_timer_index,
|
|
bx_options.Ofloppy_command_delay->get (), 0 );
|
|
/* data reg not ready, drive busy */
|
|
BX_FD_THIS s.main_status_reg = (1 << drive);
|
|
return;
|
|
break;
|
|
|
|
case 0x13: // Configure
|
|
BX_DEBUG(("configure (eis = 0x%02x)", BX_FD_THIS s.command[2] & 0x40 ));
|
|
BX_DEBUG(("configure (efifo = 0x%02x)", BX_FD_THIS s.command[2] & 0x20 ));
|
|
BX_DEBUG(("configure (no poll = 0x%02x)", BX_FD_THIS s.command[2] & 0x10 ));
|
|
BX_DEBUG(("configure (fifothr = 0x%02x)", BX_FD_THIS s.command[2] & 0x0f ));
|
|
BX_DEBUG(("configure (pretrk = 0x%02x)", BX_FD_THIS s.command[3] ));
|
|
enter_idle_phase();
|
|
return;
|
|
break;
|
|
|
|
case 0x4a: // read ID
|
|
drive = BX_FD_THIS s.command[1] & 0x03;
|
|
BX_FD_THIS s.head[drive] = (BX_FD_THIS s.command[1] >> 2) & 0x01;
|
|
BX_FD_THIS s.DOR &= 0xfc;
|
|
BX_FD_THIS s.DOR |= drive;
|
|
|
|
motor_on = (BX_FD_THIS s.DOR>>(drive+4)) & 0x01;
|
|
if (motor_on == 0) {
|
|
BX_ERROR(("floppy_command(): 0x4a: motor not on"));
|
|
BX_FD_THIS s.main_status_reg = FD_MS_BUSY;
|
|
return;
|
|
}
|
|
if (BX_FD_THIS s.device_type[drive] == BX_FLOPPY_NONE)
|
|
BX_PANIC(("floppy_command(): read ID: bad drive #%d", drive));
|
|
BX_FD_THIS s.status_reg0 = (BX_FD_THIS s.head[drive]<<2) | drive;
|
|
bx_pc_system.activate_timer( BX_FD_THIS s.floppy_timer_index,
|
|
bx_options.Ofloppy_command_delay->get (), 0 );
|
|
/* data reg not ready, controller busy */
|
|
BX_FD_THIS s.main_status_reg = FD_MS_BUSY;
|
|
return;
|
|
break;
|
|
|
|
case 0x4d: // format track
|
|
drive = BX_FD_THIS s.command[1] & 0x03;
|
|
BX_FD_THIS s.DOR &= 0xfc;
|
|
BX_FD_THIS s.DOR |= drive;
|
|
|
|
motor_on = (BX_FD_THIS s.DOR>>(drive+4)) & 0x01;
|
|
if (motor_on == 0)
|
|
BX_PANIC(("floppy_command(): format track: motor not on"));
|
|
BX_FD_THIS s.head[drive] = (BX_FD_THIS s.command[1] >> 2) & 0x01;
|
|
sector_size = BX_FD_THIS s.command[2];
|
|
BX_FD_THIS s.format_count = BX_FD_THIS s.command[3];
|
|
BX_FD_THIS s.format_fillbyte = BX_FD_THIS s.command[5];
|
|
if (BX_FD_THIS s.device_type[drive] == BX_FLOPPY_NONE)
|
|
BX_PANIC(("floppy_command(): format track: bad drive #%d", drive));
|
|
|
|
if (sector_size != 0x02) { // 512 bytes
|
|
BX_PANIC(("format track: sector size %d not supported", 128<<sector_size));
|
|
}
|
|
if (BX_FD_THIS s.format_count != BX_FD_THIS s.media[drive].sectors_per_track) {
|
|
BX_PANIC(("format track: %d sectors/track requested (%d expected)",
|
|
BX_FD_THIS s.format_count, BX_FD_THIS s.media[drive].sectors_per_track));
|
|
}
|
|
if ( BX_FD_THIS s.media_present[drive] == 0 ) {
|
|
// media not in drive, return error
|
|
BX_INFO(("attempt to format track with media not present"));
|
|
BX_FD_THIS s.status_reg0 = 0x40 | (BX_FD_THIS s.head[drive]<<2) | drive; // abnormal termination
|
|
BX_FD_THIS s.status_reg1 = 0x25; // 0010 0101
|
|
BX_FD_THIS s.status_reg2 = 0x31; // 0011 0001
|
|
enter_result_phase();
|
|
return;
|
|
}
|
|
if (BX_FD_THIS s.media[drive].write_protected) {
|
|
// media write-protected, return error
|
|
BX_INFO(("attempt to format track with media write-protected"));
|
|
BX_FD_THIS s.status_reg0 = 0x40 | (BX_FD_THIS s.head[drive]<<2) | drive; // abnormal termination
|
|
BX_FD_THIS s.status_reg1 = 0x27; // 0010 0111
|
|
BX_FD_THIS s.status_reg2 = 0x31; // 0011 0001
|
|
enter_result_phase();
|
|
return;
|
|
}
|
|
|
|
/* 4 header bytes per sector are required */
|
|
BX_FD_THIS s.format_count <<= 2;
|
|
|
|
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 1);
|
|
|
|
/* data reg not ready, controller busy */
|
|
BX_FD_THIS s.main_status_reg = FD_MS_BUSY;
|
|
BX_DEBUG(("format track"));
|
|
return;
|
|
break;
|
|
|
|
case 0x46: // read normal data, MT=0, SK=0
|
|
case 0x66: // read normal data, MT=0, SK=1
|
|
case 0xc6: // read normal data, MT=1, SK=0
|
|
case 0xe6: // read normal data, MT=1, SK=1
|
|
case 0x45: // write normal data, MT=0
|
|
case 0xc5: // write normal data, MT=1
|
|
BX_FD_THIS s.multi_track = (BX_FD_THIS s.command[0] >> 7);
|
|
if ( (BX_FD_THIS s.DOR & 0x08) == 0 )
|
|
BX_PANIC(("read/write command with DMA and int disabled"));
|
|
drive = BX_FD_THIS s.command[1] & 0x03;
|
|
BX_FD_THIS s.DOR &= 0xfc;
|
|
BX_FD_THIS s.DOR |= drive;
|
|
|
|
motor_on = (BX_FD_THIS s.DOR>>(drive+4)) & 0x01;
|
|
if (motor_on == 0)
|
|
BX_PANIC(("floppy_command(): read/write: motor not on"));
|
|
head = BX_FD_THIS s.command[3] & 0x01;
|
|
cylinder = BX_FD_THIS s.command[2]; /* 0..79 depending */
|
|
sector = BX_FD_THIS s.command[4]; /* 1..36 depending */
|
|
eot = BX_FD_THIS s.command[6]; /* 1..36 depending */
|
|
sector_size = BX_FD_THIS s.command[5];
|
|
data_length = BX_FD_THIS s.command[8];
|
|
BX_DEBUG(("read/write normal data"));
|
|
BX_DEBUG(("BEFORE"));
|
|
BX_DEBUG((" drive = %u", (unsigned) drive));
|
|
BX_DEBUG((" head = %u", (unsigned) head));
|
|
BX_DEBUG((" cylinder = %u", (unsigned) cylinder));
|
|
BX_DEBUG((" sector = %u", (unsigned) sector));
|
|
BX_DEBUG((" eot = %u", (unsigned) eot));
|
|
if (BX_FD_THIS s.device_type[drive] == BX_FLOPPY_NONE)
|
|
BX_PANIC(("floppy_command(): read/write: bad drive #%d", drive));
|
|
|
|
// check that head number in command[1] bit two matches the head
|
|
// reported in the head number field. Real floppy drives are
|
|
// picky about this, as reported in SF bug #439945, (Floppy drive
|
|
// read input error checking).
|
|
if (head != ((BX_FD_THIS s.command[1]>>2)&1)) {
|
|
BX_ERROR(("head number in command[1] doesn't match head field"));
|
|
BX_FD_THIS s.status_reg0 = 0x40 | (BX_FD_THIS s.head[drive]<<2) | drive; // abnormal termination
|
|
BX_FD_THIS s.status_reg1 = 0x04; // 0000 0100
|
|
BX_FD_THIS s.status_reg2 = 0x00; // 0000 0000
|
|
enter_result_phase();
|
|
return;
|
|
}
|
|
|
|
if ( BX_FD_THIS s.media_present[drive] == 0 ) {
|
|
// media not in drive, return error
|
|
|
|
BX_INFO(("attempt to read/write sector %u,"
|
|
" sectors/track=%u with media not present",
|
|
(unsigned) sector,
|
|
(unsigned) BX_FD_THIS s.media[drive].sectors_per_track));
|
|
BX_FD_THIS s.status_reg0 = 0x40 | (BX_FD_THIS s.head[drive]<<2) | drive; // abnormal termination
|
|
BX_FD_THIS s.status_reg1 = 0x25; // 0010 0101
|
|
BX_FD_THIS s.status_reg2 = 0x31; // 0011 0001
|
|
enter_result_phase();
|
|
return;
|
|
}
|
|
|
|
if (sector_size != 0x02) { // 512 bytes
|
|
BX_PANIC(("read/write command: sector size %d not supported", 128<<sector_size));
|
|
}
|
|
if ( cylinder >= BX_FD_THIS s.media[drive].tracks ) {
|
|
BX_PANIC(("io: norm r/w parms out of range: sec#%02xh cyl#%02xh eot#%02xh head#%02xh",
|
|
(unsigned) sector, (unsigned) cylinder, (unsigned) eot,
|
|
(unsigned) head));
|
|
return;
|
|
}
|
|
|
|
if (sector > BX_FD_THIS s.media[drive].sectors_per_track) {
|
|
// requested sector > last sector on track
|
|
BX_INFO(("attempt to read/write sector %u,"
|
|
" sectors/track=%u", (unsigned) sector,
|
|
(unsigned) BX_FD_THIS s.media[drive].sectors_per_track));
|
|
// set controller to where drive would have left off
|
|
// after it discovered the sector was past EOT
|
|
BX_FD_THIS s.cylinder[drive] = cylinder;
|
|
BX_FD_THIS s.head[drive] = head;
|
|
BX_FD_THIS s.sector[drive] = BX_FD_THIS s.media[drive].sectors_per_track;
|
|
|
|
// 0100 0HDD abnormal termination
|
|
BX_FD_THIS s.status_reg0 = 0x40 | (BX_FD_THIS s.head[drive]<<2) | drive;
|
|
// 1000 0101 end of cyl/NDAT/NID
|
|
BX_FD_THIS s.status_reg1 = 0x85;
|
|
// 0000 0000
|
|
BX_FD_THIS s.status_reg2 = 0x00;
|
|
enter_result_phase();
|
|
return;
|
|
}
|
|
|
|
if (cylinder != BX_FD_THIS s.cylinder[drive])
|
|
BX_DEBUG(("io: cylinder request != current cylinder"));
|
|
|
|
// original assumed all floppies had two sides...now it does not *delete this comment line*
|
|
logical_sector = (cylinder * BX_FD_THIS s.media[drive].heads * BX_FD_THIS s.media[drive].sectors_per_track) +
|
|
(head * BX_FD_THIS s.media[drive].sectors_per_track) +
|
|
(sector - 1);
|
|
|
|
if (logical_sector >= BX_FD_THIS s.media[drive].sectors) {
|
|
BX_PANIC(("io: logical sector out of bounds"));
|
|
}
|
|
|
|
BX_FD_THIS s.cylinder[drive] = cylinder;
|
|
BX_FD_THIS s.sector[drive] = sector;
|
|
BX_FD_THIS s.head[drive] = head;
|
|
|
|
if ((BX_FD_THIS s.command[0] & 0x4f) == 0x46) { // read
|
|
floppy_xfer(drive, logical_sector*512, BX_FD_THIS s.floppy_buffer,
|
|
512, FROM_FLOPPY);
|
|
|
|
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 1);
|
|
|
|
/* data reg not ready, controller busy */
|
|
BX_FD_THIS s.main_status_reg = FD_MS_BUSY;
|
|
return;
|
|
}
|
|
else if ((BX_FD_THIS s.command[0] & 0x7f) == 0x45) { // write
|
|
|
|
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 1);
|
|
|
|
/* data reg not ready, controller busy */
|
|
BX_FD_THIS s.main_status_reg = FD_MS_BUSY;
|
|
return;
|
|
}
|
|
else
|
|
BX_PANIC(("floppy_command(): unknown read/write command"));
|
|
|
|
return;
|
|
break;
|
|
|
|
default: // invalid or unsupported command; these are captured in write() above
|
|
BX_PANIC(("You should never get here! cmd = 0x%02x",
|
|
BX_FD_THIS s.command[0]));
|
|
}
|
|
#endif
|
|
}
|
|
|
|
void
|
|
bx_floppy_ctrl_c::floppy_xfer(Bit8u drive, Bit32u offset, Bit8u *buffer,
|
|
Bit32u bytes, Bit8u direction)
|
|
{
|
|
int ret;
|
|
|
|
if (BX_FD_THIS s.device_type[drive] == BX_FLOPPY_NONE)
|
|
BX_PANIC(("floppy_xfer: bad drive #%d", drive));
|
|
|
|
if (bx_dbg.floppy) {
|
|
BX_INFO(("drive=%u", (unsigned) drive));
|
|
BX_INFO(("offset=%u", (unsigned) offset));
|
|
BX_INFO(("bytes=%u", (unsigned) bytes));
|
|
BX_INFO(("direction=%s", (direction==FROM_FLOPPY)? "from" : "to"));
|
|
}
|
|
|
|
#if BX_WITH_MACOS
|
|
if (strcmp(bx_options.floppya.Opath->getptr (), SuperDrive))
|
|
#endif
|
|
{
|
|
ret = lseek(BX_FD_THIS s.media[drive].fd, offset, SEEK_SET);
|
|
if (ret < 0) {
|
|
BX_PANIC(("could not perform lseek() on floppy image file"));
|
|
}
|
|
}
|
|
|
|
if (direction == FROM_FLOPPY) {
|
|
#if BX_WITH_MACOS
|
|
if (!strcmp(bx_options.floppya.Opath->getptr (), SuperDrive))
|
|
ret = fd_read((char *) buffer, offset, bytes);
|
|
else
|
|
#endif
|
|
ret = ::read(BX_FD_THIS s.media[drive].fd, (bx_ptr_t) buffer, bytes);
|
|
if (ret < int(bytes)) {
|
|
/* ??? */
|
|
if (ret > 0) {
|
|
BX_INFO(("partial read() on floppy image returns %u/%u",
|
|
(unsigned) ret, (unsigned) bytes));
|
|
memset(buffer + ret, 0, bytes - ret);
|
|
}
|
|
else {
|
|
BX_INFO(("read() on floppy image returns 0"));
|
|
memset(buffer, 0, bytes);
|
|
}
|
|
}
|
|
}
|
|
|
|
else { // TO_FLOPPY
|
|
BX_ASSERT (!BX_FD_THIS s.media[drive].write_protected);
|
|
#if BX_WITH_MACOS
|
|
if (!strcmp(bx_options.floppya.Opath->getptr (), SuperDrive))
|
|
ret = fd_write((char *) buffer, offset, bytes);
|
|
else
|
|
#endif
|
|
ret = ::write(BX_FD_THIS s.media[drive].fd, (bx_ptr_t) buffer, bytes);
|
|
if (ret < int(bytes)) {
|
|
BX_PANIC(("could not perform write() on floppy image file"));
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
|
|
void
|
|
bx_floppy_ctrl_c::timer_handler(void *this_ptr)
|
|
{
|
|
|
|
bx_floppy_ctrl_c *class_ptr = (bx_floppy_ctrl_c *) this_ptr;
|
|
|
|
class_ptr->timer();
|
|
}
|
|
|
|
void
|
|
bx_floppy_ctrl_c::timer()
|
|
{
|
|
Bit8u drive;
|
|
|
|
drive = BX_FD_THIS s.DOR & 0x03;
|
|
switch ( BX_FD_THIS s.pending_command ) {
|
|
case 0x07: // recal
|
|
case 0x0f: // seek
|
|
BX_FD_THIS s.status_reg0 = 0x20 | (BX_FD_THIS s.head[drive]<<2) | drive;
|
|
if (BX_FD_THIS s.device_type[drive] == BX_FLOPPY_NONE) {
|
|
BX_FD_THIS s.status_reg0 |= 0x50;
|
|
}
|
|
else if (BX_FD_THIS s.media_present[drive] == 0) {
|
|
BX_FD_THIS s.status_reg0 |= 0x40;
|
|
BX_FD_THIS s.status_reg1 = 0x25;
|
|
BX_FD_THIS s.status_reg2 = 0x31;
|
|
}
|
|
|
|
/* reset changeline */
|
|
if (drive > 1) return;
|
|
if (BX_FD_THIS s.media_present[drive])
|
|
BX_FD_THIS s.DIR[drive] &= ~0x80; // clear disk change line
|
|
|
|
enter_idle_phase();
|
|
raise_interrupt();
|
|
break;
|
|
|
|
case 0x4a: /* read ID */
|
|
enter_result_phase();
|
|
break;
|
|
|
|
case 0xfe: // (contrived) RESET
|
|
theFloppyController->reset(BX_RESET_SOFTWARE);
|
|
BX_FD_THIS s.pending_command = 0;
|
|
BX_FD_THIS s.status_reg0 = 0xc0;
|
|
raise_interrupt();
|
|
BX_FD_THIS s.reset_sensei = 4;
|
|
break;
|
|
|
|
case 0x00: // nothing pending?
|
|
break;
|
|
|
|
default:
|
|
BX_PANIC(("floppy:timer(): unknown case %02x",
|
|
(unsigned) BX_FD_THIS s.pending_command));
|
|
}
|
|
return;
|
|
}
|
|
|
|
void
|
|
bx_floppy_ctrl_c::dma_write(Bit8u *data_byte)
|
|
{
|
|
// A DMA write is from I/O to Memory
|
|
// We need to return then next data byte from the floppy buffer
|
|
// to be transfered via the DMA to memory. (read block from floppy)
|
|
|
|
|
|
*data_byte = BX_FD_THIS s.floppy_buffer[BX_FD_THIS s.floppy_buffer_index++];
|
|
|
|
if (BX_FD_THIS s.floppy_buffer_index >= 512) {
|
|
Bit8u drive;
|
|
|
|
drive = BX_FD_THIS s.DOR & 0x03;
|
|
increment_sector(); // increment to next sector before retrieving next one
|
|
BX_FD_THIS s.floppy_buffer_index = 0;
|
|
if (DEV_dma_get_tc()) { // Terminal Count line, done
|
|
BX_FD_THIS s.status_reg0 = (BX_FD_THIS s.head[drive] << 2) | drive;
|
|
BX_FD_THIS s.status_reg1 = 0;
|
|
BX_FD_THIS s.status_reg2 = 0;
|
|
|
|
if (bx_dbg.floppy) {
|
|
BX_INFO(("<<READ DONE>>"));
|
|
BX_INFO(("AFTER"));
|
|
BX_INFO((" drive = %u", (unsigned) drive));
|
|
BX_INFO((" head = %u", (unsigned) BX_FD_THIS s.head[drive]));
|
|
BX_INFO((" cylinder = %u", (unsigned) BX_FD_THIS s.cylinder[drive]));
|
|
BX_INFO((" sector = %u", (unsigned) BX_FD_THIS s.sector[drive]));
|
|
}
|
|
|
|
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0);
|
|
enter_result_phase();
|
|
}
|
|
else { // more data to transfer
|
|
Bit32u logical_sector;
|
|
|
|
// original assumed all floppies had two sides...now it does not *delete this comment line*
|
|
logical_sector = (BX_FD_THIS s.cylinder[drive] * BX_FD_THIS s.media[drive].heads *
|
|
BX_FD_THIS s.media[drive].sectors_per_track) +
|
|
(BX_FD_THIS s.head[drive] *
|
|
BX_FD_THIS s.media[drive].sectors_per_track) +
|
|
(BX_FD_THIS s.sector[drive] - 1);
|
|
|
|
floppy_xfer(drive, logical_sector*512, BX_FD_THIS s.floppy_buffer,
|
|
512, FROM_FLOPPY);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
bx_floppy_ctrl_c::dma_read(Bit8u *data_byte)
|
|
{
|
|
// A DMA read is from Memory to I/O
|
|
// We need to write the data_byte which was already transfered from memory
|
|
// via DMA to I/O (write block to floppy)
|
|
|
|
Bit8u drive;
|
|
Bit32u logical_sector;
|
|
|
|
drive = BX_FD_THIS s.DOR & 0x03;
|
|
if (BX_FD_THIS s.pending_command == 0x4d) { // format track in progress
|
|
--BX_FD_THIS s.format_count;
|
|
switch (3 - (BX_FD_THIS s.format_count & 0x03)) {
|
|
case 0:
|
|
BX_FD_THIS s.cylinder[drive] = *data_byte;
|
|
break;
|
|
case 1:
|
|
if (*data_byte != BX_FD_THIS s.head[drive])
|
|
BX_ERROR(("head number does not match head field"));
|
|
break;
|
|
case 2:
|
|
BX_FD_THIS s.sector[drive] = *data_byte;
|
|
break;
|
|
case 3:
|
|
if (*data_byte != 2) BX_ERROR(("dma_read: sector size %d not supported", 128<<(*data_byte)));
|
|
BX_DEBUG(("formatting cylinder %u head %u sector %u",
|
|
BX_FD_THIS s.cylinder[drive], BX_FD_THIS s.head[drive],
|
|
BX_FD_THIS s.sector[drive]));
|
|
for (unsigned i = 0; i < 512; i++) {
|
|
BX_FD_THIS s.floppy_buffer[i] = BX_FD_THIS s.format_fillbyte;
|
|
}
|
|
// original assumed all floppies had two sides...now it does not *delete this comment line*
|
|
logical_sector = (BX_FD_THIS s.cylinder[drive] * BX_FD_THIS s.media[drive].heads * BX_FD_THIS s.media[drive].sectors_per_track) +
|
|
(BX_FD_THIS s.head[drive] * BX_FD_THIS s.media[drive].sectors_per_track) +
|
|
(BX_FD_THIS s.sector[drive] - 1);
|
|
floppy_xfer(drive, logical_sector*512, BX_FD_THIS s.floppy_buffer,
|
|
512, TO_FLOPPY);
|
|
break;
|
|
}
|
|
if ((BX_FD_THIS s.format_count == 0) || (DEV_dma_get_tc())) {
|
|
BX_FD_THIS s.format_count = 0;
|
|
BX_FD_THIS s.status_reg0 = (BX_FD_THIS s.head[drive] << 2) | drive;
|
|
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0);
|
|
enter_result_phase();
|
|
}
|
|
return;
|
|
}
|
|
|
|
BX_FD_THIS s.floppy_buffer[BX_FD_THIS s.floppy_buffer_index++] = *data_byte;
|
|
|
|
if (BX_FD_THIS s.floppy_buffer_index >= 512) {
|
|
// original assumed all floppies had two sides...now it does not *delete this comment line*
|
|
logical_sector = (BX_FD_THIS s.cylinder[drive] * BX_FD_THIS s.media[drive].heads * BX_FD_THIS s.media[drive].sectors_per_track) +
|
|
(BX_FD_THIS s.head[drive] * BX_FD_THIS s.media[drive].sectors_per_track) +
|
|
(BX_FD_THIS s.sector[drive] - 1);
|
|
if ( BX_FD_THIS s.media[drive].write_protected ) {
|
|
// write protected error
|
|
BX_INFO(("tried to write disk %u, which is write-protected", drive));
|
|
// ST0: IC1,0=01 (abnormal termination: started execution but failed)
|
|
BX_FD_THIS s.status_reg0 = 0x40 | (BX_FD_THIS s.head[drive]<<2) | drive;
|
|
// ST1: DataError=1, NDAT=1, NotWritable=1, NID=1
|
|
BX_FD_THIS s.status_reg1 = 0x27; // 0010 0111
|
|
// ST2: CRCE=1, SERR=1, BCYL=1, NDAM=1.
|
|
BX_FD_THIS s.status_reg2 = 0x31; // 0011 0001
|
|
enter_result_phase();
|
|
return;
|
|
}
|
|
floppy_xfer(drive, logical_sector*512, BX_FD_THIS s.floppy_buffer,
|
|
512, TO_FLOPPY);
|
|
increment_sector(); // increment to next sector after writing current one
|
|
BX_FD_THIS s.floppy_buffer_index = 0;
|
|
if (DEV_dma_get_tc()) { // Terminal Count line, done
|
|
BX_FD_THIS s.status_reg0 = (BX_FD_THIS s.head[drive] << 2) | drive;
|
|
BX_FD_THIS s.status_reg1 = 0;
|
|
BX_FD_THIS s.status_reg2 = 0;
|
|
|
|
if (bx_dbg.floppy) {
|
|
BX_INFO(("<<WRITE DONE>>"));
|
|
BX_INFO(("AFTER"));
|
|
BX_INFO((" drive = %u", (unsigned) drive));
|
|
BX_INFO((" head = %u", (unsigned) BX_FD_THIS s.head[drive]));
|
|
BX_INFO((" cylinder = %u", (unsigned) BX_FD_THIS s.cylinder[drive]));
|
|
BX_INFO((" sector = %u", (unsigned) BX_FD_THIS s.sector[drive]));
|
|
}
|
|
|
|
DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0);
|
|
enter_result_phase();
|
|
}
|
|
else { // more data to transfer
|
|
} // else
|
|
} // if BX_FD_THIS s.floppy_buffer_index >= 512
|
|
}
|
|
|
|
void
|
|
bx_floppy_ctrl_c::raise_interrupt(void)
|
|
{
|
|
DEV_pic_raise_irq(6);
|
|
BX_FD_THIS s.pending_irq = 1;
|
|
BX_FD_THIS s.reset_sensei = 0;
|
|
}
|
|
|
|
|
|
void
|
|
bx_floppy_ctrl_c::increment_sector(void)
|
|
{
|
|
Bit8u drive;
|
|
|
|
drive = BX_FD_THIS s.DOR & 0x03;
|
|
|
|
// values after completion of data xfer
|
|
// ??? calculation depends on base_count being multiple of 512
|
|
BX_FD_THIS s.sector[drive] ++;
|
|
if (BX_FD_THIS s.sector[drive] > BX_FD_THIS s.media[drive].sectors_per_track) {
|
|
BX_FD_THIS s.sector[drive] = 1;
|
|
if (BX_FD_THIS s.multi_track) {
|
|
BX_FD_THIS s.head[drive] ++;
|
|
if (BX_FD_THIS s.head[drive] > 1) {
|
|
BX_FD_THIS s.head[drive] = 0;
|
|
BX_FD_THIS s.cylinder[drive] ++;
|
|
}
|
|
}
|
|
else {
|
|
BX_FD_THIS s.cylinder[drive] ++;
|
|
}
|
|
if (BX_FD_THIS s.cylinder[drive] >= BX_FD_THIS s.media[drive].tracks) {
|
|
// Set to 1 past last possible cylinder value.
|
|
// I notice if I set it to tracks-1, prama linux won't boot.
|
|
BX_FD_THIS s.cylinder[drive] = BX_FD_THIS s.media[drive].tracks;
|
|
BX_INFO(("increment_sector: clamping cylinder to max"));
|
|
}
|
|
}
|
|
}
|
|
|
|
unsigned
|
|
bx_floppy_ctrl_c::set_media_status(unsigned drive, unsigned status)
|
|
{
|
|
char *path;
|
|
unsigned type;
|
|
|
|
if (drive == 0)
|
|
type = bx_options.floppya.Otype->get ();
|
|
else
|
|
type = bx_options.floppyb.Otype->get ();
|
|
|
|
// if setting to the current value, nothing to do
|
|
if ((status == BX_FD_THIS s.media_present[drive]) &&
|
|
((status == 0) || (type == BX_FD_THIS s.media[drive].type)))
|
|
return(status);
|
|
|
|
if (status == 0) {
|
|
// eject floppy
|
|
if (BX_FD_THIS s.media[drive].fd >= 0) {
|
|
close( BX_FD_THIS s.media[drive].fd );
|
|
BX_FD_THIS s.media[drive].fd = -1;
|
|
}
|
|
BX_FD_THIS s.media_present[drive] = 0;
|
|
if (drive == 0) {
|
|
bx_options.floppya.Ostatus->set(BX_EJECTED);
|
|
} else {
|
|
bx_options.floppyb.Ostatus->set(BX_EJECTED);
|
|
}
|
|
BX_FD_THIS s.DIR[drive] |= 0x80; // disk changed line
|
|
return(0);
|
|
}
|
|
else {
|
|
// insert floppy
|
|
if (drive == 0) {
|
|
path = bx_options.floppya.Opath->getptr ();
|
|
}
|
|
else {
|
|
path = bx_options.floppyb.Opath->getptr ();
|
|
}
|
|
if (evaluate_media(type, path, & BX_FD_THIS s.media[drive])) {
|
|
BX_FD_THIS s.media_present[drive] = 1;
|
|
if (drive == 0) {
|
|
bx_options.floppya.Ostatus->set(BX_INSERTED);
|
|
} else {
|
|
bx_options.floppyb.Ostatus->set(BX_INSERTED);
|
|
}
|
|
BX_FD_THIS s.DIR[drive] |= 0x80; // disk changed line
|
|
return(1);
|
|
}
|
|
else {
|
|
BX_FD_THIS s.media_present[drive] = 0;
|
|
if (drive == 0) {
|
|
bx_options.floppya.Ostatus->set(BX_EJECTED);
|
|
} else {
|
|
bx_options.floppyb.Ostatus->set(BX_EJECTED);
|
|
}
|
|
return(0);
|
|
}
|
|
}
|
|
}
|
|
|
|
unsigned
|
|
bx_floppy_ctrl_c::get_media_status(unsigned drive)
|
|
{
|
|
return( BX_FD_THIS s.media_present[drive] );
|
|
}
|
|
|
|
#ifdef O_BINARY
|
|
#define BX_RDONLY O_RDONLY | O_BINARY
|
|
#define BX_RDWR O_RDWR | O_BINARY
|
|
#else
|
|
#define BX_RDONLY O_RDONLY
|
|
#define BX_RDWR O_RDWR
|
|
#endif
|
|
|
|
bx_bool
|
|
bx_floppy_ctrl_c::evaluate_media(unsigned type, char *path, floppy_t *media)
|
|
{
|
|
struct stat stat_buf;
|
|
int ret;
|
|
#ifdef WIN32
|
|
char sTemp[1024];
|
|
#endif
|
|
|
|
if (type == BX_FLOPPY_NONE)
|
|
return(0);
|
|
|
|
//If media file is already open, close it before reopening.
|
|
if(media->fd >=0) {
|
|
close(media->fd);
|
|
media->fd=-1;
|
|
}
|
|
|
|
// open media file (image file or device)
|
|
media->write_protected = 0;
|
|
#ifdef macintosh
|
|
media->fd = 0;
|
|
if (strcmp(bx_options.floppya.Opath->getptr (), SuperDrive))
|
|
#endif
|
|
#ifdef WIN32
|
|
if ( (path[1] == ':') && (strlen(path) == 2) ) {
|
|
wsprintf(sTemp, "\\\\.\\%s", path);
|
|
media->fd = open(sTemp, BX_RDWR);
|
|
} else {
|
|
media->fd = open(path, BX_RDWR);
|
|
}
|
|
#else
|
|
media->fd = open(path, BX_RDWR);
|
|
#endif
|
|
|
|
if (media->fd < 0) {
|
|
BX_INFO(( "tried to open %s read/write: %s",path,strerror(errno) ));
|
|
// try opening the file read-only
|
|
media->write_protected = 1;
|
|
#ifdef macintosh
|
|
media->fd = 0;
|
|
if (strcmp(bx_options.floppya.Opath->getptr (), SuperDrive))
|
|
#endif
|
|
#ifdef WIN32
|
|
if ( (path[1] == ':') && (strlen(path) == 2) ) {
|
|
wsprintf(sTemp, "\\\\.\\%s", path);
|
|
media->fd = open(sTemp, BX_RDONLY);
|
|
} else {
|
|
media->fd = open(path, BX_RDONLY);
|
|
}
|
|
#else
|
|
media->fd = open(path, BX_RDONLY);
|
|
#endif
|
|
if (media->fd < 0) {
|
|
// failed to open read-only too
|
|
BX_INFO(( "tried to open %s read only: %s",path,strerror(errno) ));
|
|
media->type = type;
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
#if BX_WITH_MACOS
|
|
if (!strcmp(bx_options.floppya.Opath->getptr (), SuperDrive))
|
|
ret = fd_stat(&stat_buf);
|
|
else
|
|
ret = fstat(media->fd, &stat_buf);
|
|
#elif defined(WIN32)
|
|
// if ( (path[1] == ':') && (strlen(path) == 2) ) {
|
|
stat_buf.st_mode = S_IFCHR;
|
|
// maybe replace with code that sets ret to -1 if the disk is not available
|
|
ret = 0;
|
|
// } else {
|
|
// put code here for disk images
|
|
// ret = fstat(media->fd, &stat_buf);
|
|
// }
|
|
#else
|
|
// unix
|
|
ret = fstat(media->fd, &stat_buf);
|
|
#endif
|
|
if (ret) {
|
|
BX_PANIC(("fstat floppy 0 drive image file returns error: %s", strerror(errno)));
|
|
return(0);
|
|
}
|
|
|
|
if ( S_ISREG(stat_buf.st_mode) ) {
|
|
// regular file
|
|
switch (type) {
|
|
// use CMOS reserved types
|
|
case BX_FLOPPY_160K: // 160K 5.25"
|
|
media->type = BX_FLOPPY_160K;
|
|
media->sectors_per_track = 8;
|
|
media->tracks = 40;
|
|
media->heads = 1;
|
|
break;
|
|
case BX_FLOPPY_180K: // 180K 5.25"
|
|
media->type = BX_FLOPPY_180K;
|
|
media->sectors_per_track = 9;
|
|
media->tracks = 40;
|
|
media->heads = 1;
|
|
break;
|
|
case BX_FLOPPY_320K: // 320K 5.25"
|
|
media->type = BX_FLOPPY_320K;
|
|
media->sectors_per_track = 8;
|
|
media->tracks = 40;
|
|
media->heads = 2;
|
|
break;
|
|
|
|
case BX_FLOPPY_360K: // 360K 5.25"
|
|
media->type = BX_FLOPPY_360K;
|
|
media->sectors_per_track = 9;
|
|
media->tracks = 40;
|
|
media->heads = 2;
|
|
break;
|
|
case BX_FLOPPY_720K: // 720K 3.5"
|
|
media->type = BX_FLOPPY_720K;
|
|
media->sectors_per_track = 9;
|
|
media->tracks = 80;
|
|
media->heads = 2;
|
|
break;
|
|
case BX_FLOPPY_1_2: // 1.2M 5.25"
|
|
media->type = BX_FLOPPY_1_2;
|
|
media->sectors_per_track = 15;
|
|
media->tracks = 80;
|
|
media->heads = 2;
|
|
break;
|
|
case BX_FLOPPY_1_44: // 1.44M 3.5"
|
|
media->type = BX_FLOPPY_1_44;
|
|
if (stat_buf.st_size <= 1474560) {
|
|
media->sectors_per_track = 18;
|
|
media->tracks = 80;
|
|
media->heads = 2;
|
|
}
|
|
else if (stat_buf.st_size == 1720320) {
|
|
media->sectors_per_track = 21;
|
|
media->tracks = 80;
|
|
media->heads = 2;
|
|
}
|
|
else if (stat_buf.st_size == 1763328) {
|
|
media->sectors_per_track = 21;
|
|
media->tracks = 82;
|
|
media->heads = 2;
|
|
}
|
|
else {
|
|
BX_INFO(("evaluate_media: file '%s' of unknown size %lu",
|
|
path, (unsigned long) stat_buf.st_size));
|
|
return(0);
|
|
}
|
|
break;
|
|
case BX_FLOPPY_2_88: // 2.88M 3.5"
|
|
media->type = BX_FLOPPY_2_88;
|
|
media->sectors_per_track = 36;
|
|
media->tracks = 80;
|
|
media->heads = 2;
|
|
break;
|
|
default:
|
|
BX_PANIC(("evaluate_media: unknown media type"));
|
|
}
|
|
media->sectors = media->heads * media->tracks * media->sectors_per_track;
|
|
return(1); // success
|
|
}
|
|
|
|
else if ( S_ISCHR(stat_buf.st_mode)
|
|
#if BX_WITH_MACOS == 0
|
|
#ifdef S_ISBLK
|
|
|| S_ISBLK(stat_buf.st_mode)
|
|
#endif
|
|
#endif
|
|
) {
|
|
// character or block device
|
|
// assume media is formatted to typical geometry for drive
|
|
switch (type) {
|
|
// use CMOS reserved types
|
|
case BX_FLOPPY_160K: // 160K 5.25"
|
|
media->type = BX_FLOPPY_160K;
|
|
media->sectors_per_track = 8;
|
|
media->tracks = 40;
|
|
media->heads = 1;
|
|
break;
|
|
case BX_FLOPPY_180K: // 180K 5.25"
|
|
media->type = BX_FLOPPY_180K;
|
|
media->sectors_per_track = 9;
|
|
media->tracks = 40;
|
|
media->heads = 1;
|
|
break;
|
|
case BX_FLOPPY_320K: // 320K 5.25"
|
|
media->type = BX_FLOPPY_320K;
|
|
media->sectors_per_track = 8;
|
|
media->tracks = 40;
|
|
media->heads = 2;
|
|
break;
|
|
|
|
case BX_FLOPPY_360K: // 360K 5.25"
|
|
media->type = BX_FLOPPY_360K;
|
|
media->sectors_per_track = 9;
|
|
media->tracks = 40;
|
|
media->heads = 2;
|
|
break;
|
|
case BX_FLOPPY_720K: // 720K 3.5"
|
|
media->type = BX_FLOPPY_720K;
|
|
media->sectors_per_track = 9;
|
|
media->tracks = 80;
|
|
media->heads = 2;
|
|
break;
|
|
case BX_FLOPPY_1_2: // 1.2M 5.25"
|
|
media->type = BX_FLOPPY_1_2;
|
|
media->sectors_per_track = 15;
|
|
media->tracks = 80;
|
|
media->heads = 2;
|
|
break;
|
|
case BX_FLOPPY_1_44: // 1.44M 3.5"
|
|
media->type = BX_FLOPPY_1_44;
|
|
media->sectors_per_track = 18;
|
|
media->tracks = 80;
|
|
media->heads = 2;
|
|
break;
|
|
case BX_FLOPPY_2_88: // 2.88M 3.5"
|
|
media->type = BX_FLOPPY_2_88;
|
|
media->sectors_per_track = 36;
|
|
media->tracks = 80;
|
|
media->heads = 2;
|
|
break;
|
|
default:
|
|
BX_PANIC(("evaluate_media: unknown media type"));
|
|
}
|
|
media->sectors = media->heads * media->tracks * media->sectors_per_track;
|
|
return(1); // success
|
|
}
|
|
else {
|
|
// unknown file type
|
|
BX_INFO(("unknown mode type"));
|
|
return(0);
|
|
}
|
|
}
|
|
|
|
|
|
void
|
|
bx_floppy_ctrl_c::enter_result_phase(void)
|
|
{
|
|
|
|
Bit8u drive;
|
|
|
|
drive = BX_FD_THIS s.DOR & 0x03;
|
|
|
|
/* these are always the same */
|
|
BX_FD_THIS s.result_index = 0;
|
|
BX_FD_THIS s.main_status_reg = FD_MS_MRQ | FD_MS_DIO | FD_MS_BUSY;
|
|
|
|
/* invalid command */
|
|
if ((BX_FD_THIS s.status_reg0 & 0xc0) == 0x80) {
|
|
BX_FD_THIS s.result_size = 1;
|
|
BX_FD_THIS s.result[0] = BX_FD_THIS s.status_reg0;
|
|
return;
|
|
}
|
|
|
|
switch (BX_FD_THIS s.pending_command) {
|
|
case 0x04: // get status
|
|
BX_FD_THIS s.result_size = 1;
|
|
BX_FD_THIS s.result[0] = BX_FD_THIS s.status_reg3;
|
|
break;
|
|
case 0x08: // sense interrupt
|
|
BX_FD_THIS s.result_size = 2;
|
|
BX_FD_THIS s.result[0] = BX_FD_THIS s.status_reg0;
|
|
BX_FD_THIS s.result[1] = BX_FD_THIS s.cylinder[drive];
|
|
break;
|
|
case 0x4a: // read ID
|
|
case 0x4d: // format track
|
|
case 0x46: // read normal data
|
|
case 0x66:
|
|
case 0xc6:
|
|
case 0xe6:
|
|
case 0x45: // write normal data
|
|
case 0xc5:
|
|
BX_FD_THIS s.result_size = 7;
|
|
BX_FD_THIS s.result[0] = BX_FD_THIS s.status_reg0;
|
|
BX_FD_THIS s.result[1] = BX_FD_THIS s.status_reg1;
|
|
BX_FD_THIS s.result[2] = BX_FD_THIS s.status_reg2;
|
|
BX_FD_THIS s.result[3] = BX_FD_THIS s.cylinder[drive];
|
|
BX_FD_THIS s.result[4] = BX_FD_THIS s.head[drive];
|
|
BX_FD_THIS s.result[5] = BX_FD_THIS s.sector[drive];
|
|
BX_FD_THIS s.result[6] = 2; /* sector size code */
|
|
raise_interrupt();
|
|
break;
|
|
}
|
|
}
|
|
|
|
void
|
|
bx_floppy_ctrl_c::enter_idle_phase(void)
|
|
{
|
|
BX_FD_THIS s.main_status_reg &= 0x0f; // leave drive status untouched
|
|
BX_FD_THIS s.main_status_reg |= FD_MS_MRQ; // data register ready
|
|
|
|
BX_FD_THIS s.command_complete = 1; /* waiting for new command */
|
|
BX_FD_THIS s.command_index = 0;
|
|
BX_FD_THIS s.command_size = 0;
|
|
BX_FD_THIS s.pending_command = 0;
|
|
|
|
BX_FD_THIS s.floppy_buffer_index = 0;
|
|
}
|
|
|