///////////////////////////////////////////////////////////////////////// // $Id: floppy.cc,v 1.60 2002/12/11 15:45:10 bdenney Exp $ ///////////////////////////////////////////////////////////////////////// // // Copyright (C) 2002 MandrakeSoft S.A. // // MandrakeSoft S.A. // 43, rue d'Aboukir // 75002 Paris - France // http://www.linux-mandrake.com/ // http://www.mandrakesoft.com/ // // This library is free software; you can redistribute it and/or // modify it under the terms of the GNU Lesser General Public // License as published by the Free Software Foundation; either // version 2 of the License, or (at your option) any later version. // // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public // License along with this library; if not, write to the Free Software // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA // // // Floppy Disk Controller Docs: // Intel 82077A Data sheet // ftp://void-core.2y.net/pub/docs/fdc/82077AA_FloppyControllerDatasheet.pdf // Intel 82078 Data sheet // ftp://download.intel.com/design/periphrl/datashts/29047403.PDF // Other FDC references // http://debs.future.easyspace.com/Programming/Hardware/FDC/floppy.html // And a port list: // http://mudlist.eorbit.net/~adam/pickey/ports.html // // Define BX_PLUGGABLE in files that can be compiled into plugins. For // platforms that require a special tag on exported symbols, BX_PLUGGABLE // is used to know when we are exporting symbols and when we are importing. #define BX_PLUGGABLE extern "C" { #include } #include "bochs.h" // windows.h included by bochs.h #define LOG_THIS theFloppyController-> bx_floppy_ctrl_c *theFloppyController; /* for main status register */ #define FD_MS_MRQ 0x80 #define FD_MS_DIO 0x40 #define FD_MS_NDMA 0x20 #define FD_MS_BUSY 0x10 #define FD_MS_ACTD 0x08 #define FD_MS_ACTC 0x04 #define FD_MS_ACTB 0x02 #define FD_MS_ACTA 0x01 #define FROM_FLOPPY 10 #define TO_FLOPPY 11 #define FLOPPY_DMA_CHAN 2 int libfloppy_LTX_plugin_init(plugin_t *plugin, plugintype_t type, int argc, char *argv[]) { theFloppyController = new bx_floppy_ctrl_c (); bx_devices.pluginFloppyDevice = theFloppyController; BX_REGISTER_DEVICE_DEVMODEL(plugin, type, theFloppyController, BX_PLUGIN_FLOPPY); return(0); // Success } void libfloppy_LTX_plugin_fini(void) { } bx_floppy_ctrl_c::bx_floppy_ctrl_c(void) { put("FDD"); settype(FDLOG); s.floppy_timer_index = BX_NULL_TIMER_HANDLE; } bx_floppy_ctrl_c::~bx_floppy_ctrl_c(void) { // nothing for now BX_DEBUG(("Exit.")); } void bx_floppy_ctrl_c::init(void) { Bit8u i; BX_DEBUG(("Init $Id: floppy.cc,v 1.60 2002/12/11 15:45:10 bdenney Exp $")); DEV_dma_register_8bit_channel(2, dma_read, dma_write, "Floppy Drive"); DEV_register_irq(6, "Floppy Drive"); for (unsigned addr=0x03F2; addr<=0x03F7; addr++) { DEV_register_ioread_handler(this, read_handler, addr, "Floppy Drive", 7); DEV_register_iowrite_handler(this, write_handler, addr, "Floppy Drive", 7); } DEV_cmos_set_reg(0x10, 0x00); /* start out with: no drive 0, no drive 1 */ BX_FD_THIS s.num_supported_floppies = 0; for (i=0; i<4; i++) { BX_FD_THIS s.device_type[i] = BX_FLOPPY_NONE; BX_FD_THIS s.media[i].type = BX_FLOPPY_NONE; } // // Floppy A setup // BX_FD_THIS s.media[0].sectors_per_track = 0; BX_FD_THIS s.media[0].tracks = 0; BX_FD_THIS s.media[0].heads = 0; BX_FD_THIS s.media[0].sectors = 0; BX_FD_THIS s.media[0].fd = -1; BX_FD_THIS s.media_present[0] = 0; BX_FD_THIS s.device_type[0] = bx_options.floppya.Odevtype->get (); switch (BX_FD_THIS s.device_type[0]) { case BX_FLOPPY_NONE: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x00); break; case BX_FLOPPY_360K: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x10); break; case BX_FLOPPY_1_2: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x20); break; case BX_FLOPPY_720K: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x30); break; case BX_FLOPPY_1_44: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x40); break; case BX_FLOPPY_2_88: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0x0f) | 0x50); break; default: BX_PANIC(("unknown floppya type")); } if (BX_FD_THIS s.device_type[0] != BX_FLOPPY_NONE) BX_FD_THIS s.num_supported_floppies++; if (bx_options.floppya.Otype->get () != BX_FLOPPY_NONE) { if ( bx_options.floppya.Ostatus->get () == BX_INSERTED) { if (evaluate_media(bx_options.floppya.Otype->get (), bx_options.floppya.Opath->getptr (), & BX_FD_THIS s.media[0])) BX_FD_THIS s.media_present[0] = 1; else bx_options.floppya.Ostatus->set(BX_EJECTED); #define MED (BX_FD_THIS s.media[0]) BX_INFO(("fd0: '%s' ro=%d, h=%d,t=%d,spt=%d", bx_options.floppya.Opath->getptr(), MED.write_protected, MED.heads, MED.tracks, MED.sectors_per_track)); #undef MED } } // // Floppy B setup // BX_FD_THIS s.media[1].sectors_per_track = 0; BX_FD_THIS s.media[1].tracks = 0; BX_FD_THIS s.media[1].heads = 0; BX_FD_THIS s.media[1].sectors = 0; BX_FD_THIS s.media[1].fd = -1; BX_FD_THIS s.media_present[1] = 0; BX_FD_THIS s.device_type[1] = bx_options.floppyb.Odevtype->get (); switch (BX_FD_THIS s.device_type[1]) { case BX_FLOPPY_NONE: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x00); break; case BX_FLOPPY_360K: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x01); break; case BX_FLOPPY_1_2: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x02); break; case BX_FLOPPY_720K: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x03); break; case BX_FLOPPY_1_44: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x04); break; case BX_FLOPPY_2_88: DEV_cmos_set_reg(0x10, (DEV_cmos_get_reg(0x10) & 0xf0) | 0x05); break; default: BX_PANIC(("unknown floppyb type")); } if (BX_FD_THIS s.device_type[1] != BX_FLOPPY_NONE) BX_FD_THIS s.num_supported_floppies++; if (bx_options.floppyb.Otype->get () != BX_FLOPPY_NONE) { if ( bx_options.floppyb.Ostatus->get () == BX_INSERTED) { if (evaluate_media(bx_options.floppyb.Otype->get (), bx_options.floppyb.Opath->getptr (), & BX_FD_THIS s.media[1])) BX_FD_THIS s.media_present[1] = 1; else bx_options.floppyb.Ostatus->set(BX_EJECTED); #define MED (BX_FD_THIS s.media[1]) BX_INFO(("fd1: '%s' ro=%d, h=%d,t=%d,spt=%d", bx_options.floppyb.Opath->getptr(), MED.write_protected, MED.heads, MED.tracks, MED.sectors_per_track)); #undef MED } } /* CMOS Equipment Byte register */ if (BX_FD_THIS s.num_supported_floppies > 0) DEV_cmos_set_reg(0x14, (DEV_cmos_get_reg(0x14) & 0x3e) | ((BX_FD_THIS s.num_supported_floppies-1) << 6) | 1); else DEV_cmos_set_reg(0x14, (DEV_cmos_get_reg(0x14) & 0x3e)); if (BX_FD_THIS s.floppy_timer_index == BX_NULL_TIMER_HANDLE) { BX_FD_THIS s.floppy_timer_index = bx_pc_system.register_timer( this, timer_handler, bx_options.Ofloppy_command_delay->get (), 0,0, "floppy"); } BX_DEBUG(("bx_options.Ofloppy_command_delay = %u", (unsigned) bx_options.Ofloppy_command_delay->get ())); } void bx_floppy_ctrl_c::reset(unsigned type) { Bit32u i; BX_FD_THIS s.pending_irq = 0; BX_FD_THIS s.reset_sensei = 0; /* no reset result present */ BX_FD_THIS s.main_status_reg = 0; BX_FD_THIS s.status_reg0 = 0; BX_FD_THIS s.status_reg1 = 0; BX_FD_THIS s.status_reg2 = 0; BX_FD_THIS s.status_reg3 = 0; // software reset (via DOR port 0x3f2 bit 2) does not change DOR if (type == BX_RESET_HARDWARE) { BX_FD_THIS s.DOR = 0x0c; // motor off, drive 3..0 // DMA/INT enabled // normal operation // drive select 0 // DIR and CCR affected only by hard reset for (i=0; i<4; i++) { BX_FD_THIS s.DIR[i] |= 0x80; // disk changed } BX_FD_THIS s.data_rate = 0; /* 500 Kbps */ } for (i=0; i<4; i++) { BX_FD_THIS s.cylinder[i] = 0; BX_FD_THIS s.head[i] = 0; BX_FD_THIS s.sector[i] = 0; } DEV_pic_lower_irq(6); DEV_dma_set_drq(FLOPPY_DMA_CHAN, 0); enter_idle_phase(); } // static IO port read callback handler // redirects to non-static class handler to avoid virtual functions Bit32u bx_floppy_ctrl_c::read_handler(void *this_ptr, Bit32u address, unsigned io_len) { #if !BX_USE_FD_SMF bx_floppy_ctrl_c *class_ptr = (bx_floppy_ctrl_c *) this_ptr; return( class_ptr->read(address, io_len) ); } /* reads from the floppy io ports */ Bit32u bx_floppy_ctrl_c::read(Bit32u address, unsigned io_len) { #else UNUSED(this_ptr); #endif // !BX_USE_FD_SMF Bit8u status, value; if (io_len > 1) BX_PANIC(("io read from address %08x, len=%u", (unsigned) address, (unsigned) io_len)); if (bx_dbg.floppy) BX_INFO(("read access to port %04x", (unsigned) address)); switch (address) { #if BX_DMA_FLOPPY_IO case 0x3F2: // diskette controller digital output register value = BX_FD_THIS s.DOR; return(value); break; case 0x3F4: /* diskette controller main status register */ status = BX_FD_THIS s.main_status_reg; return(status); break; case 0x3F5: /* diskette controller data */ if (BX_FD_THIS s.result_size == 0) { BX_ERROR(("port 0x3f5: no results to read")); BX_FD_THIS s.main_status_reg = 0; return BX_FD_THIS s.result[0]; } value = BX_FD_THIS s.result[BX_FD_THIS s.result_index++]; BX_FD_THIS s.main_status_reg &= 0xF0; if (BX_FD_THIS s.result_index >= BX_FD_THIS s.result_size) { if (!BX_FD_THIS s.reset_sensei) BX_FD_THIS s.pending_irq = 0; DEV_pic_lower_irq(6); enter_idle_phase(); } return(value); break; #endif // #if BX_DMA_FLOPPY_IO case 0x3F3: // Tape Drive Register // see http://www.smsc.com/main/datasheets/37c93x.pdf page 18 for more details switch( BX_FD_THIS s.DOR & 0x03 ) { case 0x00: if( (BX_FD_THIS s.DOR & 0x10) == 0) break; return(2); case 0x01: if( (BX_FD_THIS s.DOR & 0x20) == 0) break; return(1); } return(3); case 0x3F6: // Reserved for future floppy controllers // This address shared with the hard drive controller value = DEV_hd_read_handler(bx_devices.pluginHardDrive, address, io_len); return( value ); break; case 0x3F7: // diskette controller digital input register // This address shared with the hard drive controller: // Bit 7 : floppy // Bits 6..0: hard drive value = DEV_hd_read_handler(bx_devices.pluginHardDrive, address, io_len); value &= 0x7f; // add in diskette change line value |= (BX_FD_THIS s.DIR[BX_FD_THIS s.DOR & 0x03] & 0x80); return( value ); break; default: BX_ERROR(("io_read: unsupported address 0x%04x", (unsigned) address)); return(0); break; } } // static IO port write callback handler // redirects to non-static class handler to avoid virtual functions void bx_floppy_ctrl_c::write_handler(void *this_ptr, Bit32u address, Bit32u value, unsigned io_len) { #if !BX_USE_FD_SMF bx_floppy_ctrl_c *class_ptr = (bx_floppy_ctrl_c *) this_ptr; class_ptr->write(address, value, io_len); } /* writes to the floppy io ports */ void bx_floppy_ctrl_c::write(Bit32u address, Bit32u value, unsigned io_len) { #else UNUSED(this_ptr); #endif // !BX_USE_FD_SMF Bit8u dma_and_interrupt_enable; Bit8u normal_operation, prev_normal_operation; Bit8u drive_select; Bit8u motor_on_drive0, motor_on_drive1; if (io_len > 1) BX_PANIC(("io write to address %08x, len=%u", (unsigned) address, (unsigned) io_len)); if (bx_dbg.floppy) BX_INFO(("write access to port %04x, value=%02x", (unsigned) address, (unsigned) value)); switch (address) { #if BX_DMA_FLOPPY_IO case 0x3F2: /* diskette controller digital output register */ 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> 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 not 512")); } if (BX_FD_THIS s.format_count != BX_FD_THIS s.media[drive].sectors_per_track) { BX_PANIC(("format track: wrong number of sectors/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(("sector_size not 512")); } 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")); logical_sector = (cylinder * 2 * 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(("<>")); 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; logical_sector = (BX_FD_THIS s.cylinder[drive] * 2 * 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(("sector size code not 2")); 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; } logical_sector = (BX_FD_THIS s.cylinder[drive] * 2 * 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) { logical_sector = (BX_FD_THIS s.cylinder[drive] * 2 * 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(("<>")); 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) ) { memset (&stat_buf, 0, sizeof stat_buf); 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) { 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) { 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; }